KR20110052796A - Axial induction motor - Google Patents

Abstract

PURPOSE: An axial induction motor is provided to reduce the loss of a coil end and increase efficiency. CONSTITUTION: An axial induction motor comprises an upper stator(13), a lower stator(14), and a rotor(19). The upper stator and the lower stator include a plurality of teeth(12) wound on a coil(11). The rotor comprises a plurality of conductive bars(18). The conductive bars are inserted into a rotor core(15) and connected to inner/outer short-circuit rings(16,17).

Description

Axial induction motor

The present invention relates to an axial induction motor, and more particularly, to an axial induction motor that combines the characteristics of a radial type motor and a flat plate motor.

In general, electric motors are widely used in various fields and structures, such as factory automation, industrial automation, office automation, and home electronics, and are widely used, and are classified into DC motors and AC motors according to the type of current applied. .

Such a motor is based on the principle of electromagnetic induction in which a conductor is disposed in a magnetic field at a right angle with a magnetic field, and when a current is applied to the conductor, an electromagnetic force is generated at a right angle to rotate the conductor.

As described above, the electric motor converts electrical energy into mechanical energy to obtain rotational power. The electric motor may be classified into an AC motor and a DC motor, and among them, an induction motor is a kind of AC motor.

The induction motor is composed of a stator and a rotor, and torque is generated in the rotor by a rotating magnetic field generated when an alternating current flows through the stator winding. In a way that is done.

For example, when a current is applied to the coil of the stator, a stator magnetic field is formed. When a current is applied to the coil of the rotor, a rotor magnetic field is formed, and the rotor may be rotated by the interaction of the two magnetic fields.

Among these electric motors, generally used widely are radial motors and flat motors.

In general, the radial type induction motor of the conventional cylindrical structure has a coil winding in the form of a winding winding to generate a rotating magnetic field in the stator slot, thereby increasing the coil end, thereby increasing the resistance of the coil and increasing the loss. Have

On the other hand, flat motors are capable of axially multilayer construction of the rotor and stator compared to the radial type induction motor of this general cylindrical structure, which can generate high torque per unit volume. It is a structure that can easily remove the rise in temperature, and mainly uses a permanent magnet.

Therefore, the present invention is intended to be a hybrid type induction motor considering the characteristics of the radial type induction motor and the plate type induction motor.

Accordingly, the present invention has been made in view of the above, and the drawback of the cylindrical induction motor, such as applying a coil of concentrated winding to the stator slot, and applying a conductor bar made of aluminum or copper to the rotor, and permanent magnet By implementing a new type of induction motor that can take advantage of the flat type induction motor without using it, it is possible to prevent the permanent magnet potato phenomenon caused by heat in the existing permanent magnet type induction motor. The aim is to provide a simple axial induction motor.

In order to achieve the above object, the axial induction motor provided in the present invention is disposed at regular intervals with the slot 10 interposed therebetween while continuing along the circumferential direction at the same time in a radial direction from one side thereof, and the coil 11 is wound The inner stator 13 and the lower stator 14 having a plurality of teeth 12 are located between the upper and lower stators 13 and 14 and are inserted into the rotor core 15 while being inserted into the inner and outer short-circuit rings ( It characterized in that it comprises a rotor 19 having a plurality of conductor bars 18 connected to the 16,17.

In addition, the conductor bar 18 is arranged in a radial shape, characterized in that the double conductor bar shape that can bridge the magnetic flux with the upper and lower stators (13,14) to improve the torque characteristics in the starting and rating It is done.

In addition, the coil 11 generates a magnetic field by a current having a 120 ° phase difference in three phases of A, B, and C. The coil 11 can be wound with a concentrated winding that can reduce the length of the coil end and reduce copper loss. It features.

In addition, the teeth 12 and the slot 10 in the upper and lower stators 13 and 14 are characterized in that the width is increased from the center toward the outside in the radial direction.

An axial induction motor according to an embodiment of the present invention provides the following advantages.

First, by applying the coils of the concentrated windings, not the distribution windings, to the stator slots, the coil spot ratio in the slots can be greatly improved, and the coil end length can be reduced to improve coil end loss and efficiency, and coil winding work in the slots. Can be easily done.

Second, without using a permanent magnet in the rotor, by configuring a conductor such as aluminum or copper in the form of a double bar, it is possible to improve the torque characteristics when starting and operating the motor.

Third, it is possible to increase the maintenance and durability of the electric motor, such as to prevent the potato due to heat by not using a permanent magnet, it is possible to manufacture a thin structure by reducing the axial length.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a cross-sectional view showing an axial induction motor according to an embodiment of the present invention, Figure 3 is a circuit of the outer short-circuit ring in the axial induction motor according to an embodiment of the present invention It is a perspective view which shows the former.

As shown in Figures 1 to 3, the axial induction motor is made up of a structure that compensates for the disadvantages of the cylindrical induction motor and takes advantage of the plate-type induction motor without permanent magnets.

To this end, the axial squirrel cage induction motor has an upper stator 13 and a lower stator 14 disposed up and down, a rotor 19 disposed between the upper stator 13 and the lower stator 14, and the stator. And a shaft (not shown) inserted through the hole 20a on the side and the hole 20b on the rotor side.

The upper and lower stators 13 are formed by stacking electrical steel plates in the vertical direction, and teeth 12 and slots 10 are formed on each side thereof, and teeth 12 and slots 10 alternately. It takes turns to be arranged one by one.

That is, the interval between the teeth 12 neighboring each other becomes the slot 10 soon.

The upper and lower stators 13 are disposed in such a state that the teeth 12 and the slots 10, which each have, face each other.

In particular, the tooth 12 is a portion in which the coil 11 is wound, and includes a plurality of coils 11 having a continuous length along the radial direction and arranged along the circumferential direction with a predetermined interval (between slots). .

As a result, the slot 10 formed between the teeth 12 is also in the form of communicating radially.

In addition, in the case of the tooth 12 and the slot 10, the width increases from the center toward the outer side along the radial direction.

In addition, a coil 11 for generating a rotating magnetic field is wound on the teeth 12 of the stator by a current having a phase difference of 120 ° in three phases of A, B, and C. In this case, the coil 11 is a coil inside a slot. In order to maximize the spot ratio, it is wound in the form of concentrated winding, not the existing distribution winding.

That is, the coil 11 may be wound in the form of a concentrated winding wound by concentrating on one tooth per stimulus.

By adopting the form of the concentrated winding in this manner, as shown in FIG. 4, the length of the coil end can be reduced as compared with the distribution winding, so that the coil end loss can be reduced and the copper loss can be reduced to improve the efficiency.

The rotor 19 includes a rotor core 15 formed by stacking electrical steel sheets in a circumferential direction, and has a generally cylindrical structure, and radially disposed therein instead of using a permanent magnet. A plurality of conductor bars 18 to be inserted are installed.

In particular, the conductor bar 18 may be made of copper or aluminum, and is formed in a double conductor bar in which the middle length of the longitudinal section is narrow, for example, two conductor bars are placed side by side in a state where they are arranged side by side. In this configuration, it is possible to bridge the magnetic flux with the upper stator 13 and the lower stator 14, thereby improving torque characteristics in starting and rating.

Here, the conductor bar 18 may be separately manufactured and installed in a manner of inserting into a hole (double conductor bar-shaped hole) of the rotor core 15, or a molten copper solution in the hole of the rotor core 15. It can be installed by injection molding.

In addition, the inner and outer circumferences of the rotor core 15 are provided with an inner short circuit 16 and an outer short circuit 17 respectively electrically and mechanically connected to the conductor bars 18, and thus the rotor is radially disposed. The conductor bar 18 inserted into the core 15, the inner short ring 16 and the outer short ring 17 have an electrically shorted structure.

Therefore, secondary currents are induced in the rotor conductors by the magnetic fields of the upper stator 13 and the lower stator 14, so that they flow through the inner and outer short-circuit rings 16 and 17. FIG.

Here, the inner and outer short-circuit ring 17 may be installed in the same manner as welding or casting by welding.

As described above, the axial induction motor of the present invention is composed of three parts of an upper stator and a lower stator, and a rotor, and a stator side hole and a rotor side hole for inserting a shaft are provided in the stator body and the rotor core. While the upper stator and the lower stator have teeth or slots in a radial structure, the coil is in the form of a concentrated winding, and a double thick bar-shaped conductor bar in the rotor core has a radial structure. In addition, since the short-circuit ring connecting the conductor bar inserted in the radial structure and the electrical and mechanical connection between the inside and the outside of the rotor core is connected, the copper loss and volume are increased due to the increase in the coil end of the cylindrical induction motor. It can compensate for the disadvantages such as increase, and by not using permanent magnet To avoid the permanent magnets potato issue in zone plate-like motor as it is inherently tough maintenance on the operating environment (temperature rise, etc.) around which the motor is used can utilize the excellent advantages.

1 is a perspective view showing an axial induction motor according to an embodiment of the present invention

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a perspective view showing a rotor in a state in which an outer short circuit ring is separated from an axial induction motor according to an embodiment of the present invention;

Figure 4 is a schematic diagram showing the distribution winding form and the concentrated winding form of the coil wound in the stator slot

<Description of the symbols for the main parts of the drawings>

10: slot 11: coil

12: tooth 13: upper stator

14: lower stator 15: rotor core

16: inner short ring 17: outer short ring

18: conductor bar 19: rotor

20a, 20b: hole

Claims (4)

The upper stator 13 and the lower side having a plurality of teeth 12 which are arranged at regular intervals with the slots 10 interposed therebetween, continuing along the circumferential direction and continuing along the radial direction on one side. It has a plurality of conductor bars 18 located between the stator 14 and the upper and lower stators 13 and 14 and inserted into the rotor core 15 and connected to the inner and outer short-circuit rings 16 and 17. An axial induction motor, characterized in that it comprises a rotor (19). 2. The conductor bar 18 according to claim 1, wherein the conductor bar 18 is arranged in a radial shape and has a double conductor bar shape that can bridge magnetic flux with the upper and lower stators 13 and 14 to improve torque characteristics at starting and rating. Axial induction motor, characterized in that made. The coil 11 is a concentrated winding that generates a magnetic field by a current having a 120 ° phase difference between three phases of A, B, and C, and can reduce the length of the coil end and reduce copper loss. Axial induction motor, characterized in that the winding. 2. The axial induction according to claim 1, wherein the teeth 12 and the slots 10 in the upper and lower stators 13 and 14 are configured to increase in width from the center to the outer portion along the radial direction. Electric motor.

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