KR101920270B1 - Rotator equipped with permanent magnet insertion type of motor - Google Patents

Abstract

The present invention relates to a rotor of a permanent magnet insertion type motor. The rotor of a permanent magnet insertion type motor comprises: a cylindrical iron core (110, 210) having a plurality of unit iron cores (111, 211), which form an outer structure of the rotor and are separated at predetermined intervals along a circumferential direction of the rotor; a permanent magnet (120) disposed between the plurality of unit iron cores (111) along the circumferential direction of the rotor and inserted and coupled along an axial direction of the rotor; a laminated iron core (130) radially formed at the center of the rotor to press-fix the permanent magnet (120) toward the cylindrical iron core (110); and a cover (140) coupled to both sides of the cylindrical iron core (110) to prevent separation between the cylindrical iron core (110), the permanent magnet (120) and the laminated core (130).

Description

[0001] The present invention relates to a permanent magnet insertion type motor,

The present invention relates to a rotor of a rotary type motor using a permanent magnet, which removes a bridge or a rib of a rotor iron core constituting the rotor and prevents separation of the rotor iron core and the permanent magnet To increase the magnetic flux density and to increase the no-load back electromotive force of the motor to improve the output density.

Generally, a motor is composed of a stator and a rotor. A winding wire is wound around a stator, and permanent magnets are embedded in the rotor.

An electric motor for generating a rotational driving force in a state where a permanent magnet is installed in a rotor has an SPM type which is attached to the surface of the rotor core according to a coupling structure of a permanent magnet provided on the rotor core, As shown in FIG.

The shape in which the permanent magnet is inserted into the rotor core constituting the rotor core is divided into a shape of being inserted in the longitudinal direction (IPM type) and a shape inserted in the lateral direction (Spoke type).

Since the rotor of the recessed permanent magnet motor is operated at a high speed, the rotor employed in these motors must be configured to rotate without electrical loss and vibration during high-speed rotation. Therefore, conventionally, permanent magnets are attached to the outer surface of the rotor, but in recent years, many permanent magnet rotors in which permanent magnets are embedded in the rotor have been widely used.

1, the SPM type electric motor 10 has a plurality of permanent magnets 13 attached to the outer circumferential surface of the rotor 11 located inside the stator 12. [ Since permanent magnets are not inserted into the inner space of the rotor used in the SMP type motor, there is a limit to increase the magnetic flux amount. That is, efficient space utilization for improving the output density is not achieved.

2, the IPM type electric motor 20 has a structure in which a plurality of permanent magnets 23 are arranged in the longitudinal direction in the rotor 21 located inside the stator 22 . In the IPM type motor, the amount of magnetic flux per pole of the permanent magnet is reduced due to the leaking from the rib.

3, the spoke type electric motor 30 includes a plurality of permanent magnets 33 inserted in the rotor 31 located inside the stator 32 in the lateral direction Therefore, in the case of an electric motor having a large number of poles, the amount of magnetic flux per pole is increased. However, since it does not utilize the rotor surface, it can not be regarded as the most efficient permanent magnet arrangement structure.

The IPM type rotor structure can effectively utilize the inner space of the rotor iron core by inserting permanent magnets in the rotor iron core in the longitudinal direction, and can improve the ratio of the stones. However, due to leakage from the bridge (lip), the magnetic flux amount of the permanent magnet is decreased. It is advantageous to design the thickness of the bridge to be thin in order to minimize the reduction of the magnetic momentum amount, but since the rigidity of the iron core must be considered, there is a limit in reducing the thickness.

Spoke type rotor structure is a structure in which pole magnet flux is very high when a motor having a large number of poles is inserted because the permanent magnet is inserted in the rotor iron core in the lateral direction. However, the spoke type also causes leakage in the bridge, resulting in a decrease in pole magnetic flux. In order to prevent this, there is a case of fixing the non-magnetic body to the shaft and sandwiching the rotor iron core laminated on the non-magnetic body in this state. However, this method has a disadvantage in that it is difficult and complicated to manufacture because the iron core needs to be inserted .

Reference is made to the existing Korean Registered Patent No. 10-1221251 (rotor of a permanent magnet motor for embedded type) to optimize the shape of both ends of the recessed groove in the rotor of the motor to minimize leaked magnetic flux and to withstand a large centrifugal force There is a functional limitation in that it does not disclose a flux leakage preventing structure by providing a rotor of a motor but combining a permanent magnet with a bridge removed from the rotor.

(Patent Document 1) KR 10-1221251 B

Conventionally, in the case of an IPM type motor in which a permanent magnet is inserted, a bridge is formed on the rotor iron core to fix the rotor iron core and the permanent magnet. In the case of the spoke type motor, a bridge is formed, or the rotor iron core is inserted into a non- The iron core and the permanent magnet were fixed by using the method of inserting the iron core and the permanent magnet,

According to the present invention, by fixing the iron core and the permanent magnet of the rotor in such a manner that the permanent magnet is engaged by using the non-magnetic body coupled to both ends of the iron core and the iron core in a state where the bridge is removed, And the bridge is removed from the rotor to prevent leakage of the permanent magnet magnetic flux.

It is another object of the present invention to provide a method of improving the ratio of the inductance between the permanent inductance and the inductance between the permanent magnets.

In order to achieve the above object, the rotor of the permanent magnet insertion type motor according to the present invention includes a plurality of unit iron cores 111 and 211 which form an outer structure of the rotor and are separated at predetermined intervals along the circumferential direction of the rotor (110, 210); A permanent magnet (120) disposed between the plurality of unit iron cores (111) along the circumferential direction of the rotor and inserted and coupled along the axial direction of the rotor; A laminated iron core 130 radially formed at the center of the rotor to press-fix the permanent magnet 120 toward the tubular core 110; And a lid 140 for preventing separation between the tubular core 110, the permanent magnet 120 and the laminated iron core 130 by being coupled to both sides of the tubular core 110.

The laminated iron core 130 includes a plurality of iron core blades 131 radially formed at the iron core central portion 133 and a blade exposing portion 132 formed at a predetermined thickness on the end of the iron core blades 131, The iron core wing 131 extends in a shape gradually narrowing from the center portion 133 of the iron core.

The plurality of unit iron cores 211 constituting the tubular core 210 each include an outer unit core 213 and an inner unit core 215 spaced on the inner side of the outer unit core 213, The inner unit core 215 has a shape in which its cross section is opened at a predetermined angle as " ".

And a pawl body 134 formed on an end of the blade exposing portion 132 to improve the flow of magnetic flux from the laminated iron core 130 and to increase the amount of magnetic flux per pole.

The rotor of the permanent magnet insertion-type motor according to the present invention as described above has a structure in which a permanent magnet is coupled using a non-magnetic body coupled to both ends of the iron core and the iron core in a state in which the bridge is removed, By fixing the magnet, the bridge is removed from the rotor of the motor in which the permanent magnet is inserted to prevent leakage of the permanent magnet magnetic flux.

1 to 3 are views showing a structure of a conventional permanent magnet motor in various manners.
FIG. 4 shows a three-dimensional rotor structure in which a bridge is removed for an IPM type 1-layer according to an embodiment of the present invention.
FIG. 5 shows a three-dimensional rotor structure in which a bridge is removed for an IPM type 2-layer according to another embodiment of the present invention.
FIG. 6 shows a three-dimensional rotor structure in which a bridge is removed for a spoke type according to another embodiment of the present invention.
FIG. 7 is a graph illustrating a comparison between the conventional IPM type having a bridge and the no-load reverse EMF waveform of the IPM type 1-layer according to the present invention.
FIG. 8 shows an embodiment in which a protrusion of a predetermined shape is formed on the laminated iron core in the three-dimensional rotor structure according to FIG.
FIG. 9 shows an embodiment according to the formation angle of the pawl body in the rotor structure in which the protrusions are formed according to FIG.
FIG. 10 is a graph showing a comparison of the no-load phase counter-electromotive force waveform of the IPM type 1-layer using the rotor structure according to the present invention in which the conventional IPM type having a bridge and the protruding body are formed
11 shows the fundamental wave effective value for the no-load phase counter electromotive force waveform shown in the rotor structure according to the present invention in which the conventional IPM type and protrusion are formed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be " connected, " " coupled, " or " connected. &Quot;

Hereinafter, a three-dimensional rotor structure in which a bridge is removed for an IPM type 1-layer according to an embodiment of the present invention will be described with reference to FIG.

A rotor 100 of a permanent magnet insertion type motor according to an embodiment of the present invention includes a tubular core 110 forming an outer structure of a rotor, A laminated iron core 130 disposed inside the iron core 110 and fixing the permanent magnets 120 and the iron core 110 coupled to both sides of the iron core 110, And a lid 140 for preventing separation between the iron core 110, the permanent magnet 120, and the laminated iron core 130. For the sake of explanation, a virtual center axis A penetrating the center of the rotor 100 is introduced.

The tubular iron core 110 has a cylindrical shape as a whole, and a plurality of separated unit iron cores 111 are arranged at regular intervals along a predetermined circumferential angle. For example, a plurality of unit iron cores 111 may be arranged at intervals of 90 degrees with respect to the central axis A. The plurality of unit iron cores (111) have coupling portions (111a) formed on both sides thereof in a shape protruding along the axial direction.

A plurality of unit iron cores 111 may have a fan shape in cross section and a fan shape in which the engaging portion 111a is reduced in a constant ratio.

The iron core 110 may be any type of iron core without stacking such as S10C, SM440a, S45C, and Pure Iron, but iron cores having excellent magnetic properties should be used for improving performance.

The permanent magnets 120 are composed of a plurality of unit permanent magnets 121 symmetrically arranged with respect to the center axis A. [ A plurality of unit permanent magnets 121 are inserted between the plurality of unit iron cores 111 along the circumferential direction of the iron core 110. Specifically, the unit permanent magnets 121 may be disposed in close contact with the side surfaces of the unit iron core 111 along the circumferential direction. The pair of unit permanent magnets 121 form one pole to form one pole. In this embodiment, it is understood that the unit permanent magnets 121 constitute four poles.

In this way, eight unit permanent magnets 121 are combined as a whole.

The laminated iron core 130 includes a plurality of iron core blades 131 formed radially with respect to the center axis A and an iron core central portion 133 formed to penetrate the centers of the plurality of iron core blades 131. Each of the plurality of iron core blades 131 has a blade exposing portion 132 formed at a predetermined thickness on the end thereof. The iron core wing 131 is formed in such a manner that its width gradually decreases from the center portion 133 of the iron core, and at the same time, the wing exposure portion 132 is formed to extend at a certain width.

The laminated iron core 130 is an electric steel sheet mainly made of silicon steel. The laminated iron core is a structure in which thin electric steel sheets are piled up and welded and fixed. The silicon steel sheet is a steel sheet having a magnetic property improved by adding a small amount of silicon to iron. Meanwhile, the iron core 110 used in the present invention means an iron core made of a cylinder, not a laminated iron core laminated by stacking thin electric steel plates.

The lid 140 has a circular plate shape in which a plurality of engaging holes 144 are formed in which a plurality of engaging portions 111a protruding from both sides of the tubular core 110 are fitted. Specifically, the lid 140 includes a lid body 141 having a thickness corresponding to a stepped dimension between the unit core 111 and the engaging portion 111a, a center axis A on the inside of the lid body 141, And a coupling hole 144 formed on the lid body 141 to correspond to a cross-sectional shape of the through hole 143 and the coupling portion 111a formed with a predetermined diameter.

The lid 140 is a non-magnetic material, and a non-magnetic material such as copper, stainless steel, high manganese steel, or aluminum is used as the non-magnetic material.

In the present invention, since the tubular core 110 is divided into four pieces, when the tubular core 110 is inserted into the non-magnetic lid 140 on both sides of the tubular core 110 for fixation, forced indentation or thermal press- So that it can be fitted and fixed.

Referring to FIG. 4B, it can be seen that the permanent magnets 120 are regularly arranged between the laminated iron core 130 and the iron core 110. Specifically, the unit permanent magnets 121 are in close contact with the side faces of the unit iron core 111 and the side faces of the iron core blades 131 along the circumferential direction. Here, the blade exposing portion 132 maintains the exposed state between the unit iron cores 111 in a state where unit permanent magnets 121 are disposed on both side surfaces of the iron core wing 131.

Referring to FIG. 4C, the assembled state prevents rocking of the laminated iron core 130 and the permanent magnet 120 through a structure in which a pair of lids 140 are coupled on both sides of the iron core 110 . Meanwhile, the blade exposing portion 132 is disposed between the unit permanent magnets 121 between the plurality of unit iron cores 111 along the circumferential direction.

Hereinafter, a three-dimensional rotor structure in which a bridge is removed for an IPM type 2-layer according to another embodiment of the present invention will be described with reference to FIG.

The rotor 200 of the permanent magnet insertion-type motor according to another embodiment of the present invention includes a tubular core 210 forming an outer structure of the rotor, a shaft 210 formed on the inside of the tubular core 210, A laminated iron core 230 disposed on the inner side of the iron core 210 to fix the permanent magnet 220 and the iron core 210 on both sides of the iron core 210, And a lid 240 for preventing separation between the iron core 210, the permanent magnet 220, and the laminated iron core 230. For the sake of explanation, a virtual center axis B penetrating the center of the rotor 200 is introduced.

The tubular iron core 210 has a cylindrical shape as a whole, and a plurality of separated unit iron cores 211 are arranged at predetermined intervals along a predetermined circumferential angle. For example, the plurality of unit iron cores 211 may be arranged at intervals of 90 degrees with respect to the central axis B.

Each of the plurality of unit iron cores 211 includes an outer unit core 213 and an inner unit core 215 spaced on the inner side of the outer unit core 213.

The outer unit core 213 has an outer coupling portion 213a protruding along the axial direction on both sides of the outer unit core 213. The inner unit core 215 has a shape protruding along the axial direction on both sides thereof And an inner engaging portion 215a.

A plurality of outer unit iron cores 213 may have a fan shape in cross section and a fan shape in which the engaging portions 213a are reduced in a constant ratio.

On the other hand, the plurality of inner unit iron cores 215 may have a shape whose cross section is widened at a predetermined angle as " ".

The permanent magnet (220) is composed of a plurality of unit permanent magnets (221) arranged symmetrically with respect to the central axis (B). The plurality of unit permanent magnets 221 includes an outer permanent magnet 223 and an inner permanent magnet 225 spaced apart from the inner side of the outer permanent magnet 223.

The outer permanent magnet 223 is disposed between the outer unit core 213 and the inner unit core 215. The inner permanent magnet 225 is disposed between the unit core 211 and the inner unit core 211 along the circumferential direction of the core 210. [ . Specifically, the inner permanent magnets 225 may be arranged such that the unit permanent magnets 121 closely contact the opposite side surfaces of the outer unit core 213 along the circumferential direction. In this way, eight unit permanent magnets 121 are combined as a whole.

The laminated iron core 230 includes a plurality of iron core blades 231 formed radially with respect to the central axis B and an iron core central portion 233 formed to penetrate the centers of the plurality of iron core blades 231. Each of the plurality of iron core blades 231 has a blade exposing part 232 formed at a predetermined thickness on the end thereof. The iron core wing 231 extends in such a manner that its width gradually decreases from the center 233 of the iron core, and at the end thereof, a wing exposure portion 232 extending to a constant width is formed.

The lid 240 has a circular plate shape in which a plurality of coupling holes 244 for fitting a plurality of coupling portions 213a and 215a protruding from both sides of the tubular core 210 are formed. Specifically, the lid 240 includes a cover body 241, and a plurality of engagement holes 244 formed radially in the through hole 243 with respect to the central axis B on the lid body 241. The plurality of engagement holes 244 include an outer engagement hole 244a to which the outer engagement portion 213a is fitted and an inner engagement hole 244b to which the inner engagement portion 213b is fitted.

Referring to FIGS. 5B and 5C, it can be seen that the permanent magnets 220 are regularly arranged between the laminated iron core 230 and the iron core 210. Hereinafter, the detailed description will be omitted, as it is similar to the embodiment 100 of the rotor described above.

Hereinafter, a three-dimensional rotor structure in which a bridge is removed with respect to a spoke type according to another embodiment of the present invention will be described with reference to FIG.

The rotor 300 of the permanent magnet insertion type electric motor according to another embodiment of the present invention includes a tubular core 310 forming an outer structure of the rotor, And a cover 340 for preventing separation between the tubular core 210 and the permanent magnet 320 by being coupled to both sides of the tubular core 310 and the permanent magnet 320 inserted and coupled along the direction of the tubular core 210. [

The tubular iron core 310 has a cylindrical shape as a whole, and a plurality of separated unit iron cores 111 are arranged at predetermined intervals along a predetermined circumferential angle. For example, the plurality of unit iron cores 111 may be arranged at intervals of 90 degrees with respect to the central axis C. The plurality of unit iron cores 311 are provided on both sides thereof with engaging portions 111a protruding along the axial direction. Here, the engaging portion 111a is formed in a strip shape in a state of being spaced from the center by a predetermined distance from the center of the unit core 311 as a reference.

Hereinafter, it can be seen that the permanent magnets 320 are regularly arranged in the iron core 310 in the combined state. Hereinafter, the detailed description is similar to the rotor embodiments 100 and 200 described above.

FIG. 7 is a graph illustrating a comparison between the conventional IPM type having a bridge and the no-load reverse EMF waveform of the IPM type 1-layer according to the present invention.

As can be seen from FIG. 7, it can be seen that the no-load back EMF of the IPM type to which the present invention is applied is relatively large. This results in an increase in the amount of magnetic flux per pole due to leakage of the permanent magnet, and shows the possibility of improving the output density (torque density) or reducing the size. Further, it can be expected that, when the bridge is removed on the basis of the above-mentioned contents, the ratio of the stones is improved.

Also, if the armature winding method is concentrated, the core loss in the rotor core may increase, but the increase in core loss can be improved to some extent by applying the distribution right.

For reference, the iron core used for the no-load back EMF analysis is S10C.

FIG. 8 shows an embodiment in which a protrusion of a predetermined shape is formed on the laminated iron core in the three-dimensional rotor structure according to FIG. FIG. 9 shows an embodiment according to the formation angle of the pawl body in the rotor structure in which the protrusions are formed according to FIG.

8 shows a case where a pawl body 134 is applied to an end portion of a blade exposing portion 132 constituting a laminated iron core 130. FIG. The pawl body 134 is expanded in such a shape that its cross-sectional area gradually increases, and may be, for example, a shape whose diameter gradually increases.

When the pillar body 134 is applied to the laminated iron core 130, the flow of the magnetic path from the laminated iron core 130 is improved and eventually the amount of magnetic flux per pole is increased.

The forming angle of the pawl body 134 and the distance between the pawl body 134 and the tubular core 110 can be deformed without being restricted by the rigidity. A pawl body 134 may be applied to the laminated iron core 130 to adjust the angle and spacing of the pawl bodies appropriately to further increase the pole magnetic flux amount. The forming angle is regarded as a coupling angle between the blade exposing portion 132 and the pawl body 134.

9 shows an example in which only the forming angle of the pawl body 134 is changed while maintaining the distance between the pawl body 134 and the iron core 110 of the laminated iron core 130 constant. Are 137 ° and 113 °, respectively.

Conventionally, when there is a bridge on an iron core, there is a condition that the thickness and the length of the bridge must be maintained at a certain level in order to take rigidity into consideration, and there is a restriction in changing the shape of the iron core to increase the pole- , The present invention is free from the above-mentioned conventional limitations.

FIG. 10 is a graph showing a result of comparing the no-load-phase counter-electromotive force waveform of the IPM type 1-layer using the rotor structure according to the present invention in which the conventional IPM type having a bridge and the protruding body are formed.

In FIG. 10, the IPM waveform is a no-load-phase counter-electromotive force waveform of a conventional model without the projection body, and two Patent_angle waveforms are no-load counter-electromotive force waveforms for two models to which the projection body of FIG.

It can be seen that the unloaded counter-electromotive force increases when the protrusion is applied according to the present invention, as compared with the case where the protrusion is applied. That is, when the protruding body is applied, it means that the magnetic pole flux amount is increased. Also, it can be seen that when the angle of the pillar body is properly adjusted, the no-load phase counter electromotive force is further increased.

11 shows the fundamental wave effective value for the no-load phase counter electromotive force waveform shown in the rotor structure according to the present invention in which the conventional IPM type and protrusion are formed.

Referring to FIG. 11, in the rotor structure according to the present invention, the rms value of the no-load-based counter electromotive force fundamental wave is larger than that of the conventional IPM in which the bridge is applied. Also, it can be seen that the effective value of the fundamental wave of no-load-phase counter-electromotive force of the model in which the angle and the interval of the pawl body are appropriately adjusted after applying the pawl body to the present invention is the largest.

As described above, according to the present invention, by fixing the iron core and the permanent magnet of the rotor in such a manner that the permanent magnet is coupled using the non-magnetic body coupled to the iron core and both side ends of the iron core in a state where the bridge is removed, The bridge is removed from the rotor of the inserted motor to prevent leakage of the permanent magnet flux.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100, 200, 300:
110, 210, 310:
120, 220, 320: permanent magnet
140, 240, 340:

Claims (4)

(110, 210) having a plurality of unit iron cores (111, 211), which form an outer structure of the rotor and are separated at predetermined intervals along the circumferential direction of the rotor;
A permanent magnet (120) disposed between the plurality of unit iron cores (111) along the circumferential direction of the rotor and inserted and coupled along the axial direction of the rotor;
A laminated iron core 130 radially formed at the center of the rotor to press-fix the permanent magnet 120 toward the tubular core 110; And
And a lid 140 coupled to both sides of the tubular core 110 to prevent separation between the tubular core 110, the permanent magnet 120, and the laminated iron core 130,
And a pawl body 134 formed on the outer end of the laminated iron core 130 and having a predetermined thickness formed on an end of the pawl exposed portion 132. The pawl body 134 has a cross- The flow of magnetic flux from the laminated iron core 130 is improved and the magnetic flux amount per pole is increased,
Rotor of permanent magnet insertion type motor.
The method according to claim 1,
The laminated iron core 130 includes a plurality of iron core blades 131 radially formed at an iron core central portion 133 and a blade exposing portion 132 formed at a predetermined thickness on an end of the iron core blades 131 , The iron core blade (131) extends in a shape gradually getting narrower in the iron core center portion (133)
Rotor of permanent magnet insertion type motor.
The method according to claim 1,
The plurality of unit iron cores 211 constituting the tubular iron core 210 each include an outer unit core 213 and an inner unit core 215 spaced on the inner side of the outer unit core 213,
The plurality of inner unit iron cores (215) have a shape in which a cross section thereof is opened at a predetermined angle,
Rotor of permanent magnet insertion type motor.
The method according to claim 1,
In a state where the distance between the pawl body 134 and the tubular core 110 is kept constant,
The forming angle, which is the angle of engagement between the blade exposing portion 132 and the pawl body 134, is in the range of 113 [deg.] To 137 [
Rotor of permanent magnet insertion type motor.

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