DE102022113733A1 - Electric motor system - Google Patents

Abstract

The invention relates to an electric motor system including a first electric motor that has first stator coils and including a second electric motor that has second stator coils. The electric motor system is characterized in that the first electric motor and the second electric motor have the same rotor and have the same laminated stator core, which has a plurality of first winding teeth on which exclusively the first stator coils are wound, and a plurality of second winding teeth on which exclusively the second stator coils are wound are.

Description

The invention relates to an electric motor system including a first electric motor that has first stator coils and including a second electric motor that has second stator coils.

DC motors are known whose stator is composed of individual stator segments, the stator segments being assigned to different sub-motors. For example, is off DE 10 2015 120 373 A1 a brushless DC motor is known which has a first sub-motor and a second sub-motor. The first sub-motor and the second sub-motor have a common rotor and each have their own stator. The stator of the respective sub-motor has a large number of teeth and a large number of windings. The teeth of the first sub-motor and the teeth of the second sub-motor are arranged nested in a circumferential direction or are arranged next to one another in an axial direction. The first sub-engine and the second sub-engine are configured to operate as a single engine to deliver normal power. If one of the sub-motors fails, the other sub-motor can continue to operate independently to improve the reliability and safety of the brushless DC motor.

Out of DE 31 40 034 C2 A brushless direct current machine with distributed winding is known, which is provided with a number of independent stator windings which ensure a continuous working sequence even in the event that a fault occurs in one of the windings or in the supply circuit feeding the windings. The direct current machine contains a permanent magnetic rotor with at least n = 2 pole pairs and a stator, the stator windings of which are combined into n winding sets. Thanks to the winding sets, which are independently controlled by a separate power supply device, the machine continues to work even if one or more circuits fail. This has the advantage that the functionality of the DC machine is maintained even if several windings fail due to an interruption or short circuit. For this purpose, the winding sets must be arranged at a distance from one another that is sufficient to reduce their mutual magnetic influence to a negligible value. However, the direct current machine is complicated and very time-consuming to manufacture.

It is the object of the present invention to provide an electric motor system that is easy to manufacture and can be used flexibly.

The task is solved by an electric motor system, which is characterized in that the first electric motor and the second electric motor have the same laminated stator core, which has a plurality of first winding teeth on which exclusively the first stator coils are wound, and a plurality of second winding teeth on which exclusively the second ones Stator coils are wound.

In accordance with the invention, it was recognized that, quite surprisingly, a single, common laminated stator core can be used for an electric motor system of the type mentioned at the outset, which has a plurality of first winding teeth, onto which exclusively the first stator coils are wound, and a plurality of second winding teeth, onto which exclusively the second ones Stator coils are wound. In particular, according to the invention, it was recognized that no additional means for separating the magnetic flux between individual winding teeth are required. In particular, no additional means for separating the magnetic flux are required even if first winding teeth, which are assigned to the first electric motor, and second winding teeth, which are assigned to the second electric motor, are arranged adjacent to one another. Rather, it has been shown that even both electric motors of the electric motor system according to the invention can be operated simultaneously with very high mechanical power output, largely without the electric motors having a negative influence on one another. However, it is also possible to use only the first of the electric motors. In this case, the second electric motor (or possibly a third) electric motor is available as a replacement motor in the event that the first electric motor fails. Alternatively or additionally, it can also be provided that, for example, after a start-up phase in which both electric motors are operated simultaneously, one of the electric motors is switched off in order to save energy.

The first electric motor and the second electric motor preferably have the same, preferably single, rotor, which is arranged to be rotatable relative to the stator. In particular, the rotor can be arranged rotatably in the stator core. Alternatively, however, it is also possible for the electric motors to be designed as external rotors and for the rotor to surround the stator.

In a particularly compact design, the rotor is at least as long in the axial direction as the entire stator core and/or the first stator coils and/or the second stator coils and/or the first winding teeth and/or the second winding teeth.

The rotor can have a plurality of permanent magnets, preferably arranged symmetrically and/or equidistantly in the circumferential direction. In particular, the permanent magnets can be arranged relative to the stator coils in such a way that the first stator coils interact with all permanent magnets during operation of the first electric motor and that the second stator coils interact with all permanent magnets during operation of the second electric motor.

In a particularly simple and compact design, the stator core has a stack of, preferably laminated and insulated, electrical sheets, each of which has first sections that are part of the first winding teeth and second sections that are part of the second winding teeth. If the electric motor system has additional electric motors, third, fourth, etc. sections, which are part of the third, fourth, etc. winding teeth, can be present in an analogous manner. The electrical sheets can be connected to one another in a cohesive and/or form-fitting and/or force-fitting manner, in particular by gluing, riveting and/or screwing.

In a particularly advantageous manner, the stator can be designed such that each of the electrical sheets contributes a portion to each of the winding teeth. In particular, it can advantageously be provided that the stator core consists of a stack of electrical sheets, preferably identical, manufactured in one piece and electrically insulated from one another and/or glued together. The electrical sheets can be manufactured in a conventional manner, in particular by punching (and possibly further processing steps, such as applying an insulating agent).

In a particularly simple and compact design, each of the electrical sheets has an annular section, on the circumference of which, in particular on the inner circumference, the first and second sections are arranged alternately all around.

Preferably, the stator core is not composed of segment-like winding teeth or segment-like winding tooth groups. Rather, it is preferred that the stator core is produced as a one-piece stack of, in particular identical, electrical sheets, which cannot be dismantled into individual segments of winding teeth or groups of winding teeth without destroying the electrical sheets.

Preferably, with a view to a compact design, the first winding teeth and the second winding teeth are not axially spaced apart from one another and are also not arranged axially offset from one another. Rather, it is preferred that the first winding teeth and the second winding teeth are arranged axially the same. Alternatively or additionally, it can advantageously be provided that the first winding teeth and the second winding teeth are designed to be the same, in particular at least axially the same size.

Preferably, each of the first stator coils is wound exclusively on a single first winding tooth. Alternatively or additionally, it can advantageously be provided that each of the second stator coils is wound exclusively on a single second winding tooth. It has been shown that the electric motor system according to the invention works particularly well if only a single stator coil of either the first electric motor or the second electric motor (possibly the third, fourth, etc. electric motor) is wound on a winding tooth. The stator coils can be wound in a particularly advantageous manner using a needle winder. In particular, it is also possible for a winding tooth to carry several first or several second stator coils. In particular, it is possible for several winding wires to be wound simultaneously using the same needle winder.

In a particularly efficient design, each first winding tooth carries only one of the first stator coils. Alternatively or additionally, it can advantageously be provided that each second winding tooth carries exclusively a single one of the second stator coils. This design makes a significant contribution to ensuring that the electric motors can be operated, especially simultaneously, without interfering with each other.

The first and second (and possibly third, fourth, etc.) stator coils can be designed the same. In particular, the first electric motor and the second electric motor can be designed to be the same in this way. Such an embodiment has the very special advantage that the second electric motor (or possibly a third, fourth...) electric motor can easily be used as a replacement motor under the same operating and control conditions in the case that the first electric motor fails.

In particular, such an electric motor system also makes it possible, for example, to start up a system to be driven from standstill using the first and second (and possibly third...) electric motors at the same time, with (at least) one of the electric motors being switched off after starting up in order to control the system then continue to operate efficiently with only one of the electric motors (or with a smaller number of electric motors than when starting). However, this is also possible if the first stator coils differ from the second stator coils with respect to at least one property.

In a particularly versatile design, the first stator coils differ from the second stator coils in terms of at least one property. For example, the first stator coils can differ from the second stator coils with respect to at least one of the following properties: number of turns, winding wire diameter, winding wire cross section, winding wire material, type of winding, operating voltage, operating current. In this way, it can advantageously be achieved that the first electric motor has different properties, for example with regard to the maximum torque and/or the maximum speed and/or the starting behavior, than the second (and/or third, fourth...) electric motor.

Such an electric motor system makes it possible, for example, to start up a system to be driven from a standstill with the first electric motor, which is designed to provide a particularly high torque, while the second electric motor is switched off, in order to then switch off the first electric motor and the started system with the second Electric motor, which is designed to provide a high continuous speed, to continue to operate. Switching from the first electric motor to the second electric motor can take place, for example, when at least one parameter, for example a speed or a torque, of the electric motor system or the system driven by the electric motor system reaches a previously determined value. In particular, at least one sensor can be present for measuring the parameter.

For example, a parked vehicle, which is equipped with at least one such electric motor system according to the invention to achieve propulsion, can be effectively set in motion from a standstill by means of a first electric motor of the electric motor system, which is designed to provide a particularly high torque, with a switching to the second electric motor, which is designed to provide a high continuous speed, occurs as soon as a predetermined parameter, for example a predetermined or adjustable vehicle speed and / or a specific speed, is reached.

In a particularly versatile embodiment, the first electric motor is designed for a first operating voltage, while the second electric motor is designed for a second operating voltage that is different from the first operating voltage. For example, the first electric motor can be designed for a first operating voltage of 12 volts, while the second electric motor is designed for a second operating voltage of 48 volts.

In a particularly advantageous embodiment, which can be used in particular in the field of electric vehicles, the first electric motor is designed for a first operating voltage which is over 350 volts, in particular 400 volts or 800 volts. The second electric motor is designed for a second operating voltage, which is also over 350 volts, in particular 400 volts or 800 volts. In particular, the second operating voltage can be as high as the first operating voltage or can differ from the first operating voltage. The same applies analogously to the operating current strengths. In a special embodiment, the first stator coils are designed to be operated at a first operating voltage and at a first operating current. Analogously, the second stator coils are designed to be operated at a second operating voltage and at a second operating current.

It is also possible that the first electric motor is designed for a first operating voltage that is above 350 volts, in particular 400 volts or 800 volts, while the second electric motor is designed for a second operating voltage that is below 100 volts, in particular 48 volts or 12 volts or a multiple of 12 volts.

The operating voltage can in particular be a direct voltage. In a special embodiment, the operating voltage is an intermediate circuit voltage that is present in an intermediate circuit, with an output converter, in particular a frequency converter, being connected downstream of the intermediate circuit, to which the stator coils are connected. The intermediate circuit can be preceded by an input converter, which provides the intermediate circuit voltage (for example by rectifying an alternating voltage, in particular a grid-connected alternating voltage). Alternatively, the intermediate circuit voltage can be provided by an electrical energy storage device, in particular a battery or a rechargeable battery.

In an advantageous embodiment, the first stator coils are integrated into a first electrical circuit, while the second stator coils are integrated into a second electrical circuit that is separate and/or independent of the first electrical circuit. The first electrical circuit can be, for example, a star connection or a delta connection. Alternatively or additionally, it can advantageously be provided that the second electrical circuit is a star connection or a Delta connection is. In particular, it is not absolutely necessary but is advantageously possible for the electrical circuits of different electric motors to be of the same circuit type. In the case of star connections, the first circuit and the second circuit can advantageously have a common star point. However, separate star points are also possible.

Preferably, the first electrical circuit and the second electrical circuit are designed such that they can be operated independently of one another. This has the very particular advantage that a failure of one of the electric motors and/or a failure of the electrical circuit assigned to the electric motor has no influence on the functionality of the remaining electric motor(s). However, in particular for simultaneous operation of the first and second electric motors, it can be provided that (for example by coupling the first and second circuits) the control of the first electric motor takes place synchronously or with a time delay in synchronism with the control of the second electric motor. In particular, it can advantageously be provided that the control signals are the same (apart from a time offset) at least with regard to the frequency and the phase positions for both (and possibly further) electric motors. In this way, it is particularly well ensured that the electric motors do not adversely affect each other during simultaneous operation or when switching from one electric motor to the other electric motor during sequential operation.

Preferably, the rotor can be driven to rotate by exclusively energizing the first stator coils. Preferably, the rotor can also be driven to rotate by exclusively energizing the second stator coils.

Alternatively or additionally, it can advantageously be provided that the rotor can be driven to rotate by simultaneously energizing the first stator coils and the second stator coils. Simultaneous energization of the first stator coils and the second stator coils, in particular all stator coils (if third, fourth... stator coils are present), has the advantage that the electric motor system has a higher output power.

The first electric motor can advantageously be designed as a brushless direct current motor or as a permanently excited synchronous motor. The second electric motor can also advantageously be designed as a brushless direct current motor or as a permanently excited synchronous motor.

In a special embodiment, the first electric motor and the second electric motor are designed as a multi-phase motor, in particular as a three-phase motor. In order to achieve high efficiency in joint operation, it can advantageously be provided that each of the first stator coils is assigned to one of the phases and that each of the second stator coils is assigned to one of the phases, the assignment of the phases of the first stator coils being related to the assignment of the phases of the second stator coils is rotationally offset.

In a special embodiment of the electric motor system, a second stator coil is arranged between two first stator coils. The first stator coils can each be arranged centrally between the second stator coils. However, it is also advantageously possible for the distances between the first stator coils and the immediately adjacent second stator coils to be different.

The total number of first stator coils can be different from the total number of second stator coils. This makes it possible to create electric motors with very different properties. Alternatively or additionally, it can advantageously be provided that the first winding teeth have a different size than the second winding teeth. This also makes it possible to create electric motors with very different properties. However, it is not excluded that the total number of the first stator coils and the second stator coils is the same and/or that the first winding teeth and the second winding teeth are designed the same.

A drive system that has an electric motor system according to the invention and an electronic control device is particularly advantageous. In particular, the control device can have a first drive electronics, which controls the energization of the first stator coils, and/or a second drive electronics, which controls the energization of the second stator coils. The control device can contain several, in particular redundant, drive electronics, each of which is designed to energize the first and second (and third, fourth...) stator coils. The control device can in particular be designed to control at least one operating variable of the first and/or second (or third, fourth...) electric motor, in particular the speed and/or the torque and/or an electrical current intensity and/or an electrical operating voltage and/or or a frequency, to control or regulate.

In particular, for simultaneous energization of the first stator coils and the second stator coils (in particular all stator coils), it can advantageously be provided that the drive electronics with can be synchronized with each other. For this purpose, the drive electronics can contain a synchronization circuit. Even with such an embodiment, however, it can advantageously be provided that the electric motor system can continue to be operated using only one electric motor if an error occurs in the other electric motor and/or its drive electronics.

In particular, it can advantageously be provided that the control device controls or regulates the respective electric motor (or all electric motors of the electric motor system) by means of pulse width modulation. Such a design allows precise control or regulation of the speed and/or torque. When controlling or regulating an electric motor using pulse width modulation, the duty cycle and the carrier frequency are of particular relevance. In particular, it can advantageously be provided that the control device controls or regulates the respective electric motor by means of pulse width modulation with a carrier frequency in the range from 4 kHz to 150 kHz, in particular in the range from 20 kHz to 100 kHz or 20 kHz to 70 kHz. These carrier frequencies have the very special advantage that high efficiency and/or high speeds can be achieved. In addition, a particular advantage of these comparatively high carrier frequencies is that compact dimensions are possible without excessive heating occurring at high current intensities. In a particularly advantageous manner, the carrier frequencies mentioned also avoid loud engine noises or at least shift them into a frequency range that is inaudible to a person.

In a particularly reliable design of the drive system, the first drive electronics and the second drive electronics have different control algorithms. In this way, the risk of systematic errors in the drive system is reduced. In particular, it can advantageously be provided that the control device compares the control signals of the drive electronics with one another for plausibility, in particular when both electric motors are operated at the same time.

In a particularly advantageous embodiment of the drive system, the first electric motor has a first rotational position sensor, which transmits measurement signals to the first drive electronics, while the second electric motor has a second rotational position sensor (different and/or different from the first rotational position sensor), which transmits measurement signals to the second drive electronics transmitted. The rotational position sensors can be designed in the same way. Alternatively, however, it is also particularly possible for the rotational position sensors to differ from one another in terms of their measuring principle, which makes the drive system particularly insusceptible to systematic errors. In particular, it can advantageously be provided that the control device compares the measurement signals of the rotational position sensors with one another for plausibility, in particular if both electric motors are operated at the same time. In particular, if both rotational position sensors measure the rotational position of the same, preferably single, rotor, in the event of a discrepancy, further steps can be triggered, in particular automatically, such as the calculation and use of an average value or a motor shutdown or the output of a warning signal.

Alternatively, it is also possible for the first electric motor and the second electric motor to have a common rotational position sensor, which transmits measurement signals to the first drive electronics and to the second drive electronics. Such a design requires less installation space.

The electric motor system according to the invention and the drive system according to the invention can be used particularly advantageously in systems in which a versatile and reliable drive of a component is required. In particular, use in safety-relevant systems, in particular in safety-relevant vehicle systems, such as steering systems, active chassis or robots, is particularly advantageous.

In this respect, a steering system, in particular a car steering system or a truck steering system, which has at least one electric motor system according to the invention or a drive system according to the invention, is particularly advantageous. The steering can be, for example, power steering and/or superimposed steering and/or steer-by-wire steering. The use of an electric motor system according to the invention or a drive system according to the invention in a steering system is particularly advantageous because a very high level of safety is required in a vehicle in order to be able to rule out a sudden total failure of the steering system. In addition, operation with the first electric motor or operation with the second electric motor or with both electric motors can be selected for different driving situations. With regard to great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently.

A chassis that has at least one electric motor system according to the invention or one according to the invention is also particularly advantageous Drive system has. The chassis can in particular be an active chassis for a motor vehicle. The active chassis can be designed in particular for pitch stabilization and/or for roll stabilization and/or for height adjustment of a vehicle body relative to the wheels. The use of an electric motor system according to the invention or a drive system according to the invention in an active chassis is particularly advantageous because a very high level of safety is required in a vehicle in order to be able to rule out a sudden and dangerous total failure while driving. In addition, operation with the first electric motor or operation with the second electric motor or with both electric motors can be selected for different driving situations. With regard to great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently.

A robot, in particular an industrial robot, which contains at least one electric motor system according to the invention or a drive system according to the invention is also particularly advantageous. In particular, the electric motor system according to the invention or the drive system according to the invention can advantageously be part of a robot joint. The robot joint can in particular be designed in such a way that it connects two carriers of a robot arm to one another in a movable manner, in particular in a rotationally movable or pivoting manner, wherein a movement of the carriers relative to one another can be controlled or regulated by means of the electric motor system according to the invention or the drive system according to the invention. The use of an electric motor system according to the invention or a drive system according to the invention in a robot or robot joint is particularly advantageous because a very high level of safety is required in a robot in order to be able to reliably rule out a sudden and dangerous total failure, especially during the execution of a movement. In addition, operation with the first electric motor or operation with the second electric motor or with both electric motors can be selected, adapted to different application situations of the robot. With regard to great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently.

An aircraft, in particular a fly-by-wire aircraft, which contains at least one electric motor system according to the invention or a drive system according to the invention is also particularly advantageous. The electric motor system according to the invention or the drive system according to the invention can be used in particular to control or regulate the position of a rudder or a flap. The use of an electric motor according to the invention or a drive system according to the invention in an aircraft is particularly advantageous because a very high level of safety is required in an aircraft in order to be able to reliably rule out a sudden and dangerous total failure, especially during flight. In addition, either operation with the first electric motor or operation with the second electric motor or operation with both electric motors can be selected, adapted to different flight situations. With regard to great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently.

A vehicle, in particular a construction machinery vehicle, which has at least one electric motor system according to the invention or a drive system according to the invention is also particularly advantageous. The use of an electric motor system according to the invention or a drive system according to the invention in a vehicle is particularly advantageous because a vehicle requires a very high level of safety in order to be able to rule out a sudden and dangerous total failure while driving. In addition, operation with the first electric motor or operation with the second electric motor or operation with both electric motors can be selected for different driving situations. With regard to great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently. The vehicle can advantageously have several electric motor systems according to the invention, the electric motor systems driving different drive wheels and/or different drive axles of the vehicle.

A construction machine that has at least one electric motor system according to the invention or a drive system according to the invention is also particularly advantageous. The use of an electric motor system according to the invention or a drive system according to the invention in a construction machine is particularly advantageous because a very high level of safety is required in construction machines in order to be able to exclude a sudden and dangerous total failure during operation. In addition, operation with either the first electric motor or operation with the second electric motor or operation with both electric motors can be selected for different application situations. In terms of great flexibility, it is particularly advantageous if the first electric motor and the second electric motor are designed differently.

The electric motor system according to the invention can advantageously be used as a generator system in a reversal operation in which the rotor is driven to rotate from the outside relative to the stator. Here too, the electric motor system according to the invention offers the advantage of redundancy and/or the individual utilization of different properties of the first and second electric motors and/or the simultaneous use of the first and second electric motors.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen Elektromotorsystems,
• 2 ein erstes Ausführungsbeispiel eines erfindungsgemäßen Antriebssystems,
• 3 ein zweites Ausführungsbeispiel eines erfindungsgemäßen Antriebssystems,
• 4 ein Ausführungsbeispiel eines Elektroblechs für einen geblechten Statorkern eines erfindungsgemäßen Elektromotorsystems in der Draufsicht,
• 5 ein Ausführungsbeispiel eines geblechten Statorkerns eines erfindungsgemäßen Elektromotorsystems in einer Seitenansicht, und
• 6 ein drittes Ausführungsbeispiel eines erfindungsgemäßen Antriebssystems.

In the drawings, the subject matter of the invention is shown as an example and schematically and is described below with reference to the figures, with identical or identically acting elements usually being provided with the same reference numerals even in different exemplary embodiments. Show:

• 1 an embodiment of an electric motor system according to the invention,
• 2 a first exemplary embodiment of a drive system according to the invention,
• 3 a second embodiment of a drive system according to the invention,
• 4 an exemplary embodiment of an electrical sheet for a laminated stator core of an electric motor system according to the invention in a top view,
• 5 an embodiment of a laminated stator core of an electric motor system according to the invention in a side view, and
• 6 a third embodiment of a drive system according to the invention.

1 shows an exemplary embodiment of an electric motor system 1 according to the invention. The electric motor system 1 includes a first electric motor, which has first stator coils 2, and also includes a second electric motor, which has second stator coils 3. The first electric motor and the second electric motor have the same permanent magnet rotor 4, which has a plurality of permanent magnets 5. The first electric motor and the second electric motor also have the same laminated stator core, which has a plurality of first winding teeth 6, onto which exclusively the first stator coils 2 are wound, and a plurality of second winding teeth 7, onto which exclusively the second stator coils 3 are wound.

In this exemplary embodiment, the stator core has six first winding teeth 6 and six second winding teeth 7.

The first electric motor is designed as a three-phase motor, with the same phase U1, V1 and W1 being assigned to two first stator coils 2 (in pairs) that are 180 degrees opposite each other. The first stator coils 2 of the same phase U1, V1, W1 can be connected in series or in parallel. The second electric motor is also designed as a three-phase motor, with two second stator coils 3 that are 180 degrees opposite each other being assigned the same phase U2, V2 and W2. The second stator coils 3 of the same phase can be connected in series or in parallel. The assignment of the phases of the first stator coils 2 is offset from the assignment of the phases of the second stator coils 3 clockwise by 30 degrees (360 degrees divided by 12, namely the number of first and second winding teeth). The required electrical connections of the stator coils 2, 3 can advantageously be achieved by directly connecting the respective winding wires, in particular by directly connecting the respective winding wires, in particular in a plug connector for connecting to a control device. Alternatively, the use of busbars is also possible, and it can be particularly advantageously provided that the busbars of the first electric motor and the busbars of the second electric motor are arranged spatially separated on different axial sides of the stator core.

2 shows a first exemplary embodiment of a drive system according to the invention, which has an electric motor system 1 according to the invention and an electronic control device 8. The control device 8 has first drive electronics 9, which controls the current supply to the first stator coils 2 and which is connected to the first stator coils 2. The control device 8 also has a second drive electronics 10, which controls the current supply to the second stator coils 3 and which are connected to the second stator coils 3.

The first stator coils 2 of the same phase U1, V1, W1 and the second stator coils 3 of the same phase U2, V2, W2 are each connected in parallel in this embodiment.

3 shows a second exemplary embodiment of a drive system according to the invention, which has an electric motor system 1 according to the invention and an electronic control device 8. The control device 8 has first drive electronics 9, which controls the current supply to the first stator coils 6 and which are connected to the first stator coils 6 by means of a first plug connector 16. The control device 8 also has a second drive electronics 10, which controls the energization of the second stator coils 7 and by means of a second plug connector ders 17 are connected to the second stator coils 7.

The first stator coils 2 of the same phase U1, V1, W1 and the second stator coils 3 of the same phase U2, V2, W2 are each connected in series in this embodiment. For the sake of clarity, only the supply lines with respect to phases U1 and W1 of the first electric motor and the supply lines with respect to phase V2 of the second electric motor are shown as examples and schematically. The remaining first and second stator coils (2, 3) are connected in the same way, but this is not shown.

4 shows an exemplary embodiment of an electrical sheet 11 for a laminated stator core 12 of an electric motor system 1 according to the invention in a top view. The electrical sheet 11 is intended to form a stack of electrical sheets 11 and thus a stator core 12 with other identical electrical sheets 11, as shown in 5 is shown in a side view.

The electrical sheet 11 has first sections 13 which are intended to be part of the first winding teeth 6. The electrical sheet 11 also has second sections 14, which are intended to be part of the second winding teeth 7. The electrical sheet 11 also has an annular section 15, on the inner circumference of which the first sections 13 and second sections 14 are arranged alternately all around.

The electrical sheet 11 is manufactured in one piece, for example by a punching process. The electrical sheet 11 is covered with an electrically insulating insulating material.

6 shows a third exemplary embodiment of a drive system according to the invention, which includes an electric motor system 1 and an electronic control device 8, which includes first drive electronics 9 and second drive electronics 10.

Each of the drive electronics 9, 10 has an input converter 20, an intermediate circuit 21 and an output converter 22. The first stator coils 2 of the electric motor system 1 are connected to one of the output converters 22, each of which contains several transistor groups. The second stator coils 3 of the electric motor system 1 are connected to the other of the output converters 22, each of which contains several transistor groups.

An intermediate circuit voltage 18 is present in the intermediate circuit 21, which is the operating voltage in this exemplary embodiment.

Each of the drive electronics 9, 10 has a transistor group controller 19 for controlling the output converter 22.

The transistor group controls 19 are connected to one another via a synchronization line 23 and synchronized with one another.

List of reference symbols:

1

Electric motor system

2

first stator coil

3

second stator coil

4

rotor

5

Permanent magnet

6

first winding teeth

7

second winding teeth

8th

Control device

9

first drive electronics

10

second drive electronics

11

Electrical sheet metal

12

Stator core

13

first section

14

second part

15

annular section

16

first connector

17

second connector

18

DC link voltage

19

Transistor group control

20

Input power converter

21

intermediate circuit

22

Output converter

23

Synchronization line

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015120373 A1 [0002]
• DE 3140034 C2 [0003]

Claims (14)

Electric motor system (1) comprising a first electric motor which has first stator coils (2), and comprising a second electric motor which has second stator coils (3), characterized in that the first electric motor and the second electric motor have the same laminated stator core (12), which has a plurality of first winding teeth (6), onto which exclusively the first stator coils (2) are wound, and a plurality of second winding teeth (7), onto which exclusively the second stator coils (3) are wound. Electric motor system (1). Claim 1 , characterized in that a. the stator core (12) contains a stack of electrical laminations (11), each of which has at least first sections which are part of the first winding teeth (6) and second sections which are part of the second winding teeth (7), or that b . the stator core (12) contains a stack of electrical sheets (11), each of which has at least first sections that are part of the first winding teeth (6) and second sections that are part of the second winding teeth (7), each of the electrical sheets ( 11) has an annular section (15), on the circumference of which, in particular the inner circumference, the first and second sections are arranged alternately all around. Electric motor system (1). Claim 1 or 2 , characterized in that a. each of the first stator coils (2) are each wound exclusively on a single first winding tooth and/or that each of the second stator coils (3) are each wound exclusively on a single second winding tooth, and/or that b. each first winding tooth (6) carries exclusively a single one of the first stator coils (2) and/or that each second winding tooth (7) carries exclusively a single one of the second stator coils (3), and/or that c. the first stator coils (2) differ from the second stator coils (3) with respect to at least one property, and/or that d. the first stator coils (2) differ from the second stator coils (3) with respect to at least one of the following properties: number of turns, winding wire diameter, winding wire cross section, winding wire material, type of winding, operating voltage, operating current, and / or that e. the first electric motor is designed for a first operating voltage and that the second electric motor is designed for a second operating voltage that is different from the first operating voltage, and / or that f. the first stator coils (2) are integrated into a first electrical circuit and that the second stator coils (3) are integrated into a second electrical circuit that is separate and/or independent of the first electrical circuit, and/or that g. the first electrical circuit is a star connection or a delta connection and/or that the second electrical circuit is a star connection or a delta connection. Electric motor system (1) according to one of the Claims 1 until 3 , characterized in that a. the first electric motor and the second electric motor have the same rotor (4), and/or that b. the first electric motor and the second electric motor have the same rotor (4) and the rotor is at least as long in the axial direction as the entire stator core and/or the first stator coils (2) and/or the second stator coils (3) and/or the first winding teeth (6) and/or the second winding teeth (7), and/or that c. the first electric motor and the second electric motor have the same rotor (4) and the rotor has a plurality of permanent magnets, in particular arranged symmetrically and/or equidistantly in the circumferential direction, and/or that d. the first electric motor and the second electric motor have the same rotor (4) and the rotor is at least as long in the axial direction as the entire stator core and/or the first stator coils (2) and/or the second stator coils (3) and/or the first Winding teeth (6) and/or the second winding teeth (7), wherein the first stator coils (2) interact with all permanent magnets during operation of the first electric motor and that the second stator coils (3) interact with all permanent magnets during operation of the second electric motor. Electric motor system (1) according to one of the Claims 1 until 4 , characterized in that a. the first stator coils (2) are designed to be operated at a first operating voltage and a first operating current, and the second stator coils (3) are designed to be operated at a second operating voltage and a second operating current, or that b. the first stator coils (2) are designed to be operated at a first operating voltage and a first operating current, and the second stator coils (3) are designed to be operated at a second operating voltage and a second operating current, wherein the first operating voltage is over 350 volts, in particular 400 volts or 800 volts, and / or that the second operating voltage is over 350 volts, in particular 400 volts or 800 volts. Electric motor system (1) according to one of the Claims 1 until 5 , characterized in that a. the rotor (4) can be driven to rotate by exclusively energizing the first stator coils (2) and/or that the rotor (4) can be driven to rotate by exclusively energizing the second stator coils (3), and/or that b. the rotor (4) can be driven to rotate by simultaneously energizing the first stator coils (2) and the second stator coils (3). Electric motor system (1) according to one of the Claims 1 until 6 , characterized in that a. the first electric motor is designed as a brushless direct current motor or as a permanently excited synchronous motor, and / or that b. the second electric motor is designed as a brushless direct current motor or as a permanently excited synchronous motor. Electric motor system (1) according to one of the Claims 1 until 7 , characterized in that a. the first electric motor is designed as a multi-phase motor, in particular as a three-phase motor, and that the second electric motor is designed as a multi-phase motor, in particular as a three-phase motor, or that b. The first electric motor is designed as a multi-phase motor, in particular as a three-phase motor, and that the second electric motor is designed as a multi-phase motor, in particular as a three-phase motor, wherein each of the first stator coils (2) is assigned to one of the phases and that each of the second stator coils (3) is assigned to one of the Phases are assigned, the assignment of the phases of the first stator coils (2) being rotationally offset from the assignment of the phases of the second stator coils (3). Electric motor system (1) according to one of the Claims 1 until 8th , characterized in that a. A second stator coil (3) is arranged between two first stator coils (2), and/or that b. A second stator coil (3) is arranged between two first stator coils (2), the distances between the first stator coils (2) and the immediately adjacent second stator coils (3) being different, and/or that c. the total number of first stator coils (2) is different from the total number of second stator coils (3), and/or that d. the first winding teeth (6) are designed to be unequal to the second winding teeth (7), particularly in terms of size. Drive system that is an electric motor system (1) according to one of the Claims 1 until 9 and an electronic control device (8). drive system Claim 10 , characterized in that a. the control device (8) has a first drive electronics (9) which controls the energization of the first stator coils (2), and/or that the control device (8) has a second drive electronics (10) which controls the energization of the second stator coils (3). controls, and/or that b. the control device (8) has a first drive electronics (9) which controls the energization of the first stator coils (2), and/or that the control device (8) has a second drive electronics (10) which controls the energization of the second stator coils (3). controls, wherein the first drive electronics (9) and the second drive electronics (10) are synchronized with one another or synchronization can be switched on, and / or that c. the control device (8) has a first drive electronics (9) which controls the energization of the first stator coils (2), and/or that the control device (8) has a second drive electronics (10) which controls the energization of the second stator coils (3). controls, wherein the first drive electronics (9) and the second drive electronics (10) have different control algorithms drive system Claim 10 or 11 , characterized in that a. the first electric motor has a first rotational position sensor which transmits measurement signals to the first drive electronics (9), and that the second electric motor has a second rotational position sensor which transmits measurement signals to the second drive electronics (10), or that b. The first electric motor and the second electric motor have a common rotational position sensor which transmits measurement signals to the first drive electronics (9) and to the second drive electronics (10). Steering, in particular car steering or truck steering, which has at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 has, or chassis, in particular active chassis for a motor vehicle, which has at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 has, or robots, in particular industrial robots, containing at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 , or robot joint, which has at least one electric motor system (1) according to one of the Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 has, or aircraft, in particular fly-by-wire aircraft, which has at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system one of the Claims 10 until 12 has, or vehicle that has at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 has, or vehicle, the vehicle has several electric motor systems (1) according to one of the Claims 1 until 9 has, wherein the electric motor systems (1) drive different drive wheels and / or different drive axles of the vehicle, or construction machine, which has at least one electric motor system (1) according to one of Claims 1 until 9 or a drive system according to one of the Claims 10 until 12 having. Use of an electric motor system (1) according to one of the Claims 1 until 9 as a generator system.

Images