CN212366955U - Reluctance type high-efficiency large-torque high-speed motor - Google Patents
Reluctance type high-efficiency large-torque high-speed motor Download PDFInfo
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- CN212366955U CN212366955U CN202020937891.4U CN202020937891U CN212366955U CN 212366955 U CN212366955 U CN 212366955U CN 202020937891 U CN202020937891 U CN 202020937891U CN 212366955 U CN212366955 U CN 212366955U
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Abstract
The invention relates to a reluctance type high-efficiency high-torque high-speed motor which comprises a stator, a rotor and a rotating shaft, wherein the stator is arranged on the outer side of the rotor, the rotor comprises a rotor iron core and a permanent magnet, the rotor is positioned and fixed with the rotating shaft through a central hole, a plurality of magnetic pole arc surfaces eccentric to the central hole of the rotor are arranged on the outer ring of the rotor iron core and are circumferentially and uniformly distributed, a plurality of magnetic steel grooves are arranged on the rotor iron core, the magnetic steel grooves are axial through grooves, the permanent magnet is embedded into the magnetic steel grooves, the number of the magnetic steel grooves is even, each 2 magnetic steel grooves which form included angles and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of the central hole of the rotor, the V-shaped distributed large openings of the magnetic steel groove group. The invention has the beneficial effects that: the motor has high reluctance torque ratio, good sine of the air gap flux density and good linearity of a quadrature axis and a direct axis, wide high-efficiency speed regulation range and large low-speed torque of the motor.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a reluctance type efficient large-torque high-speed motor.
Background
The motor for the electric motor of prior art all is wheel hub formula structure, and wheel hub formula motor is the structure of table subsides formula magnetic pole mostly, motor compact structure, it is convenient to install and use, it is single also to have not few drawbacks, for example because the magnetic pole of table subsides formula, the air gap magnetic density sinusoidal type of motor is not good, salient pole rate theory is 1, the speed-raising space of motor is very narrow and efficiency is not high, the motor speed-raising causes the risk of permanent magnet demagnetization very high, prior art's in-wheel motor, or can satisfy high-speed demand, but output torque is little and the electric current demand is big, or can satisfy low-speed big moment of torsion, but can't satisfy high-speed user demand, can't realize both and can't high efficiency.
In order to solve the problems in the prior art, technical personnel in the field are dedicated to develop a reluctance type high-efficiency high-torque high-speed motor, and the invention is an innovative motivation to match with a reasonably designed intermediate speed reduction mechanism to realize the requirement conversion of the motor on the rotating speed, seek to improve the salient pole ratio of the motor, widen the high-efficiency speed regulation interval of the motor, meet the high-efficiency high-speed output, realize the output of the low-speed high-torque characteristic, optimize the sine characteristic of air gap flux density distribution of the motor and the stability of control, and improve the efficiency and the output torque of the motor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a reluctance type high-efficiency high-torque high-speed motor which can meet the requirements of high-efficiency high-speed output, can realize low-speed high-torque output, has a wider high-efficiency speed regulation range and high efficiency and high torque. The reluctance type high-efficiency large-torque high-speed motor provided by the invention has the advantages that the magnetic circuit is reasonably designed, the pole slot combination is optimized, the larger salient pole ratio is obtained by adjusting the included angle of the built-in V-shaped permanent magnet and the pole arc coefficient of the magnetic pole, and the high-efficiency speed regulation range of the motor is widened. The motor of the invention also arranges the magnetic bridge between the two permanent magnets of which the rotor forms a V shape, thereby improving the d-axis inductance, reducing the current increasing speed of weak magnetic acceleration and obtaining the acceleration effect with high efficiency. After the motor is matched with a corresponding transmission speed reducing mechanism, the motor is suitable for the electric vehicle, the output of the motor has both speed and torque, the high-efficiency interval is wide, and the endurance mileage is obviously increased.
In order to achieve the purpose, the invention provides a reluctance type high-efficiency large-torque high-speed motor, which adopts the technical scheme that:
the utility model provides a high-speed motor of high-efficient big moment of torsion of magnetic resistance formula, includes stator, rotor and rotation axis, the stator cover is established the rotor outside, the rotor includes rotor core and permanent magnet, the rotor pass through the centre bore with the rotation axis location is fixed, rotor core is folded by the punching and is pressed its characterized in that: the outer ring of the rotor iron core is provided with a plurality of magnetic pole arc surfaces which are eccentric with the central hole of the rotor, the magnetic pole arc surface is formed by connecting a plurality of arc surfaces with different curvature radiuses or is formed by only one arc surface, the magnetic pole arc surface is in an outward convex shape, the magnetic pole arc surfaces are uniformly distributed in the circumferential direction, the rotor iron core is provided with a plurality of magnetic steel grooves, the magnetic steel groove is an axial through groove, the permanent magnet is arranged in the magnetic steel groove in an embedded mode, the number of the magnetic steel grooves is even, every 2 magnetic steel grooves which form an included angle and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of the rotor central hole, the V-shaped distributed large openings of the magnetic steel groove groups face outwards away from the circle center, and the magnetic steel groove groups correspond to the magnetic pole arc surfaces one by one and are circumferentially and uniformly distributed. The scheme uses 2 magnetic steel slots which are symmetrical about a symmetry axis to form a magnetic steel slot group, permanent magnets contained in each magnetic steel slot group form a magnetic pole of the motor, the magnetic steel slots are circumferentially and uniformly distributed by taking the magnetic steel slot group as a unit, the design scheme not only ensures the magnetic field balance symmetry of each magnetic pole of the motor, but also ensures the uniform symmetry of magnetic fields of all poles in the circumferential direction of the rotor, the magnetic density of the motor is uniformly distributed and has good consistency, the reasonable design of a magnetic circuit is facilitated, the sine distribution of the magnetic density of an air gap of the motor is ensured, the salient pole rate is improved, the high efficiency interval in the speed expanding and regulating range of the motor is expanded, the motor of the design scheme has reluctance torque, and the partial torque is beneficial to improving the maximum output torque of the. The V-shaped included angle in the design scheme can select a reasonable included angle to obtain a better pole arc coefficient according to an actual stator slot type, the air gap flux density distribution is more sinusoidal, the cogging torque can be reduced, and the motor efficiency is improved. The convex shape of the magnetic pole arc surface in the design scheme is a shape structure with a high middle part and low two sides of the magnetic pole arc surface, so that the design ensures that the air gap length of each pole of the rotor is the shortest in the middle part of each magnetic pole, and the rule is gradually increased towards the two sides, thereby being beneficial to constructing sinusoidal flux density distribution, eliminating motor noise and vibration and enabling the motor to work more stably.
The invention provides a reluctance type high-efficiency large-torque high-speed motor, which also has the following auxiliary technical scheme:
the interpolar arc surfaces are smoothly connected with the magnetic pole arc surfaces, any interpolar arc surface corresponds to the middle position of two magnetic steel groove groups, and the interpolar arc surfaces are uniformly distributed in the circumferential direction. According to the design scheme, the sine characteristic of the air gap flux density distribution of the motor is ensured, the control stability of the motor is remarkably improved, and meanwhile, the existence of the inter-electrode arc surface reduces the tooth space torque and the Venturi wave torque of the motor, thereby being beneficial to improving the salient pole rate of the motor and expanding the high-efficiency speed regulation range.
Wherein, 2 magnet steel grooves of the magnet steel groove group are respectively independent and the middle is provided with a magnetic bridge, the magnetic bridge is made of rotor core body materials, and end face gaps are reserved at two ends of the permanent magnet. The magnetic bridge structure in the scheme aims to improve d-axis inductance of the motor, optimize the weak magnetic speed-up characteristic of the motor and improve the output efficiency of the motor in a constant-power weak magnetic speed-up interval.
Permanent magnets are arranged in 2 magnetic steel grooves of the magnetic steel groove group, the permanent magnets are cuboids, and the side faces, deviating from the circle center, of the permanent magnets distributed in a V shape in the same magnetic steel groove group and facing outwards are of the same magnetic polarity. The design scheme is that the motor has reluctance torque, and the highest flux weakening rotating speed of the motor is improved.
Wherein the magnetic polarities of the rotor are circumferentially spaced in "N" and "S" poles.
Wherein, the stator is equipped with 12 open slots and matches the rotor and be equipped with 5 pairs of magnetic poles, or the stator is equipped with 12 open slots and matches the rotor and be equipped with 4 pairs of magnetic poles.
Wherein, the outer diameter of the stator is 135 mm-160 mm, and the inner diameter of the stator is 75 mm-95 mm. According to the design scheme, a larger stator slot can be obtained on the premise that the electromagnetic circuit of the e-mail is rich, more windings can be placed, the single-strand sectional area of the windings is improved, the current overload capacity of the motor is improved, and the power density and the output torque of the motor in a limited space are facilitated.
Wherein, the maximum rotation external diameter of the rotor is 75 mm-95 mm. According to the scheme, the outer diameter is selected in a wider range, the motor can be matched with a reasonable speed reducing mechanism conveniently to achieve different torque output requirements, and the output torque of the motor can be effectively increased through a longer rotor force arm.
The rotor core is provided with a plurality of rotor core holes, and the rotor core holes are provided with a plurality of rotor core holes.
Compared with the prior art, the invention has the advantages and beneficial effects that:
compared with the prior art, the reluctance type high-efficiency large-torque high-speed motor provided by the invention has the advantages that the motor has larger salient pole rate, is more suitable for a flux-weakening speed-increasing control scheme, and has a wide high-efficiency adjustable speed range, namely the rotating speed and torque range of high-efficiency output of the motor are much wider than those of a common motor. The V-shaped magnetic steel layout is convenient for the motor to select a proper pole arc coefficient according to the magnetic circuit optimization requirement, improves the sine characteristic of the air gap flux density of the motor, and can well reduce the cost. The cambered surface of the magnetic pole with the convex shape effectively adjusts the distribution rule of the air gap flux density of the motor, the air gap flux density distribution presents good sinusoidal characteristic, and the sinusoidal characteristic greatly improves the stability of motor control.
Compared with the common motor of the same type, the reluctance type high-efficiency high-torque high-speed motor provided by the invention reserves more abundant reluctance torque, namely, the reluctance torque has high proportion relative to the effective torque output of the motor, and the torque performance of the reluctance torque can be well released through the drive of the optimization and control mode of the magnetic circuit of the motor, so that the motor has the advantages of small drive current required for outputting the same torque and high efficiency.
Compared with the motor in the prior art, the reluctance type high-efficiency large-torque high-speed motor provided by the invention is provided with the interpolar arcs of the arc convex structures, and the structures aim to reduce the quadrature axis inductance and ensure the linearity of the quadrature axis inductance, so that the quadrature axis inductance shows the characteristic of tending to stability along with the current change, and the efficiency and the stability of the motor flux weakening and speed expansion are effectively improved. In addition, the motor is also provided with a magnetic bridge structure, the salient pole rate of the motor can be reduced by the magnetic bridge, but the d-axis inductance of the motor is greatly improved on the premise of ensuring that the motor has the enough salient pole rate meeting the requirement through the reasonable design of the V-shaped clamp angle, the end surface gap, the interelectrode arc and the interelectrode width, so that the speed-up effect of the motor is excellent, the high-speed output efficiency is high, and the high-efficiency interval of the motor is greatly widened.
Compared with the motor in the prior art, the reluctance type high-efficiency high-torque high-speed motor provided by the invention has the advantages that the high-efficiency output rotating speed range is wide, the locked-rotor torque of the motor is large, the current required by the motor to output the same torque is small, the control quality of weak magnetic speed acceleration is good, the control stability of the motor is good, and the endurance mileage is long.
Drawings
Fig. 1 is a schematic structural diagram of a reluctance type high-efficiency large-torque high-speed motor according to the present invention.
Fig. 2 is a schematic structural view of a rotor of the reluctance type high-efficiency large-torque high-speed motor of the invention.
Fig. 3 is a schematic structural diagram of a rotor core of the reluctance type high-efficiency large-torque high-speed motor according to the present invention.
Fig. 4 is an enlarged view of a portion 116 of fig. 3.
In the figure, 1, rotor; 2. a stator; 3. buckling points; 11. a rotor core; 12. a permanent magnet; 111. a central bore; 112. a magnetic bridge; 113. a magnetic steel groove; 114. a magnetic pole arc surface; 115. an interelectrode arc surface; 116. a magnetic steel slot group; 117. lightening holes; 118. an end face void; 119. a conjoined key.
Detailed Description
The following is a detailed description of the embodiments of the present invention, and the technical solutions of the present invention are further described in detail with reference to the accompanying drawings, and it should be noted that the described embodiments are only intended to facilitate the understanding of the present invention by those skilled in the art, and do not limit the scope of the present invention in any way.
Example 1:
as shown in fig. 1 to 4, the reluctance type high-efficiency large-torque high-speed motor provided in this embodiment includes a stator 2, a rotor 1 and a rotating shaft, the stator 2 is disposed outside the rotor 1, the stator 2 includes a stator core and a winding, the stator core is formed by laminating silicon steel sheet layers, a plurality of fastening points 3 are disposed on the stator 2 for positioning, laminating and fastening between the silicon steel sheet layers of the stator core, the winding is wound on teeth of the stator core, and the winding in this embodiment is wound on each tooth in multiple batches. The rotor 1 of the present embodiment includes a rotor core 11 and permanent magnets 12, the rotor core 11 is formed by laminating silicon steel sheet layers, and the positioning and fastening between the silicon steel sheet layers of the rotor core 11 is also realized by the fastening points 3 on the silicon steel sheet. The rotor 1 is fixed to the rotating shaft of the motor through the central hole 111, and an anti-rotation structure, such as a flat key structure in this embodiment, is provided between the central hole 111 and the rotating shaft, where the flat key structure is a connected key 119 structure formed by punching a rotor core material. The rotor core 11 of this embodiment is provided with a plurality of magnetic pole arc surfaces 114 eccentric to the rotor center hole 111 on the outer ring and uniformly distributed in the circumferential direction, the magnetic pole arc surfaces 114 are formed by a section of arc to form an outwardly convex surface, the rotor core 11 is provided with a plurality of magnetic steel grooves 113, the magnetic steel grooves 113 are axial through grooves, the permanent magnet 12 is embedded in the magnetic steel grooves 113, the number of the magnetic steel grooves 113 is even, each 2 magnetic steel grooves 113 forming an included angle and distributed in a V shape form a magnetic steel groove group 116, 2 magnetic steel grooves 113 in the magnetic steel groove group 116 are symmetrical with respect to the symmetry axis of the rotor 1 center hole 111, the magnetic pole arc surfaces 114 are symmetrical with respect to the symmetry axis of the center hole 111, and the symmetry axis of each magnetic pole arc surface 114 coincides with the symmetry center line of two magnetic steel grooves 113 in one magnetic steel groove group. The V-shaped large openings of the magnetic steel groove group 116 face outwards away from the center of circle, and the magnetic steel groove group 116 and the magnetic pole arc surfaces 114 are in one-to-one correspondence and are circumferentially and uniformly distributed. In the embodiment, the included angle of the V-shaped distribution of the permanent magnets 12 is 79-82 degrees, and the motor performance is optimal when the included angle is matched with the stator of the embodiment.
Specifically, one inter-pole arc surface 115 is spaced between every 2 magnetic pole arc surfaces 114 of the rotor core 11, the inter-pole arc surfaces 115 are smoothly connected with the magnetic pole arc surfaces 114, any inter-pole arc surface 115 corresponds to the middle position of two magnetic steel groove groups 116, and the inter-pole arc surfaces 115 are circumferentially and uniformly distributed. The arc structures of the magnetic pole arc surface 114 and the interpolar arc surface 115 optimize the airtight distribution rule of the motor, enable the airtight distribution rule to be closer to sine, and optimize the cogging torque.
Further, 2 magnetic steel slots 113 of the magnetic steel slot group 116 are independent respectively, a magnetic bridge 112 is arranged in the middle of the 2 magnetic steel slots, the magnetic bridge 112 is made of the rotor core 11 body material, end face gaps 118 are reserved at two ends of the permanent magnet 12, the width of the magnetic bridge 112 in the embodiment is 0.3-1.5 mm, the width of the magnetic bridge 112 can guarantee the operability and the production qualification rate of the manufacturing process, the d-axis inductance of the motor can be improved, and the weak magnetic characteristic of the motor is changed.
Further, 2 magnet steel grooves 113 of the magnet steel groove group 116 are internally provided with permanent magnets 12, the permanent magnets 12 are cuboids, the side faces, deviating from the circle center, of the permanent magnets 12 distributed in a V shape in the same magnet steel groove group 116 facing outwards are of the same magnetic polarity, and the magnetic polarities of the rotor 1 are distributed at intervals in the circumferential direction of the N pole and the S pole.
Further, the stator 2 of the present embodiment is provided with 12 open slots matching the rotor 1 with 5 pairs of magnetic poles. The increase of the number of pole pairs is beneficial to improving the stability of motor control.
Further, the outer diameter of the stator 2 is 144 mm-146 mm, the inner diameter of the stator 2 is 89 mm-90 mm, and further preferably, the outer diameter of the stator 2 in the embodiment is 145mm, and the inner diameter of the stator 2 is 89.7 mm.
Further, the maximum rotational outer diameter of the rotor 1 of the present embodiment is 88 to 89.5mm, and more preferably, the maximum rotational outer diameter of the rotor 1 of the present embodiment is 89 mm.
The above embodiments are only preferred embodiments of the present invention, which are only used for illustrating the technical solutions of the present invention, and are not meant to limit the patent scope of the present invention, and all modifications or equivalent substitutions that are made to the technical solutions of the present invention by using the contents of the description and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present invention.
Although the terms rotor 1, stator 2, fastening point 3, rotor core 11, permanent magnet 12, center hole 111, magnetic bridge 112, magnetic steel slot 113, magnetic pole arc surface 114, inter-pole arc surface 115, magnetic steel slot group 116, lightening hole 117, end face gap 118, integral key 119, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (9)
1. The utility model provides a high-speed motor of high-efficient big moment of torsion of magnetic resistance formula, includes stator, rotor and rotation axis, the stator cover is established the rotor outside, the rotor includes rotor core and permanent magnet, the rotor pass through the centre bore with the rotation axis location is fixed, rotor core is folded by the punching and is pressed its characterized in that: the outer ring of the rotor iron core is provided with a plurality of magnetic pole arc surfaces which are eccentric with the central hole of the rotor, the magnetic pole arc surface is formed by connecting a plurality of arc surfaces with different curvature radiuses or is formed by only one arc surface, the magnetic pole arc surface is in an outward convex shape, the magnetic pole arc surfaces are uniformly distributed in the circumferential direction, the rotor iron core is provided with a plurality of magnetic steel grooves, the magnetic steel groove is an axial through groove, the permanent magnet is arranged in the magnetic steel groove in an embedded mode, the number of the magnetic steel grooves is even, every 2 magnetic steel grooves which form an included angle and are distributed in a V shape form a magnetic steel groove group, 2 magnetic steel grooves in the magnetic steel groove group are symmetrical about the symmetry axis of the rotor central hole, the V-shaped distributed large openings of the magnetic steel groove groups face outwards away from the circle center, and the magnetic steel groove groups correspond to the magnetic pole arc surfaces one by one and are circumferentially and uniformly distributed.
2. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: every 2 of rotor core a interelectrode arc surface is separated between the magnetic pole arc surfaces, interelectrode arc surface with the magnetic pole arc surface smooth connection, arbitrary interelectrode arc surface corresponds two the intermediate position of magnet steel groove group, interelectrode arc surface circumference equipartition.
3. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the 2 magnetic steel grooves of the magnetic steel groove group are independent respectively, a magnetic bridge is arranged in the middle of each magnetic steel groove, each magnetic bridge is made of a rotor iron core body material, and end face gaps are reserved at two ends of each permanent magnet.
4. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the permanent magnets are arranged in 2 magnetic steel grooves of the magnetic steel groove group and are cuboids, and the side faces, which face outwards away from the circle center, of the permanent magnets distributed in a V shape in the same magnetic steel groove group are of the same magnetic polarity.
5. A reluctance-type high-efficiency large-torque high-speed motor according to claim 3, wherein: the magnetic polarities of the rotor are circumferentially spaced in "N" and "S" poles.
6. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the stator is provided with 12 open slots to match the rotor is provided with 5 pairs of magnetic poles, or the stator is provided with 12 open slots to match the rotor is provided with 4 pairs of magnetic poles.
7. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the outer diameter of the stator is 135 mm-160 mm, and the inner diameter of the stator is 75 mm-95 mm.
8. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the maximum rotation outer diameter of the rotor is 75 mm-95 mm.
9. The reluctance-type high-efficiency large-torque high-speed motor according to claim 1, wherein: the rotor center hole is provided with a plurality of inward convex connected key structures, and the connected keys and the rotor iron core are of the same integral structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020937891.4U CN212366955U (en) | 2020-05-28 | 2020-05-28 | Reluctance type high-efficiency large-torque high-speed motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020937891.4U CN212366955U (en) | 2020-05-28 | 2020-05-28 | Reluctance type high-efficiency large-torque high-speed motor |
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| CN212366955U true CN212366955U (en) | 2021-01-15 |
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| CN202020937891.4U Active CN212366955U (en) | 2020-05-28 | 2020-05-28 | Reluctance type high-efficiency large-torque high-speed motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4064526A1 (en) * | 2021-03-26 | 2022-09-28 | Hefei Jee Power Systems Co., Ltd. | Rotary motor sheet and rotor |
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2020
- 2020-05-28 CN CN202020937891.4U patent/CN212366955U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4064526A1 (en) * | 2021-03-26 | 2022-09-28 | Hefei Jee Power Systems Co., Ltd. | Rotary motor sheet and rotor |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jinyuxing Electromechanical Technology (Zhejiang) Co.,Ltd. Assignor: TAIZHOU JINYU ELECTROMECHANICAL Co.,Ltd. Contract record no.: X2023330000583 Denomination of utility model: A High Efficiency, High Torque, and High Speed Magnetoresistance Motor Granted publication date: 20210115 License type: Common License Record date: 20230908 |
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| EE01 | Entry into force of recordation of patent licensing contract |