KR20200141209A - Rotor for preventing to be scattered a plurality of permanent magnets - Google Patents

Abstract

The present invention relates to a rotor having a permanent magnet scattering prevention structure, and it is possible to solve the problem that the permanent magnets buried in the rotor core are separated from the rotor core and scattered, so that the motor can be stably operated at high speed, while the Vibration and noise can be reduced, enabling quiet operation.

Description

A rotor having a structure for preventing scattering of permanent magnets.

The present invention relates to a rotor structure of a motor, and more particularly, to a rotor having a permanent magnet scattering prevention structure.

In Korean Patent Laid-Open No. 10-2005-0069055 (2005.07.05), one or more pairs of buried grooves facing outward about the rotation axis of the rotor are formed symmetrically, and permanent magnets are embedded in the buried grooves. The rotor structure of is described.

A type of motor in which permanent magnets are embedded in the rotor core is called an IPMSM (Interior Permanent Magnet Synchronous Motor). In the case of such an embedded permanent magnet synchronous motor, the rotor core is rotated by the rotor core. There is a problem that the permanent magnets buried in the rotor are separated from the rotor core and scattered.

Therefore, the present inventor solves the problem that the permanent magnets buried in the rotor core are separated from and scattered from the rotor core, so that the motor can be stably operated at high speed while reducing the vibration and noise of the motor. I did research.

Republic of Korea Patent Publication No. 10-2005-0069055 (2005.07.05)

An object of the present invention is to provide a rotor having a permanent magnet scattering prevention structure capable of solving the problem that permanent magnets embedded in the rotor core are separated from and scattered from the rotor core.

Another object of the present invention is to provide a rotor having a permanent magnet scattering prevention structure capable of reducing cogging torque and torque ripple.

According to an aspect of the present invention for achieving the above object, a rotor having a permanent magnet scattering prevention structure includes a rotating shaft; A rotor core which is inserted and fixed to the rotating shaft and in which a plurality of vertical buried grooves are radially formed along an outer periphery; A plurality of permanent magnet pieces buried in vertical buried grooves formed in the rotor core; It includes an upper retainer and a lower retainer that are inserted and fixed to the rotating shaft on both sides of the rotor core, and prevent a plurality of permanent magnet pieces from being separated from and scattered from the vertical buried grooves when the rotor core is rotated.

According to an additional aspect of the present invention, the rotor having a permanent magnet scattering prevention structure further includes a stopper for binding so that the upper retainer, which is inserted and fixed to the rotation shaft, does not deviate from the rotation shaft.

According to an additional aspect of the present invention, the rotor core includes a plurality of vertical through holes radially formed inside the vertical buried groove for weight reduction.

According to an additional aspect of the present invention, a plurality of rotor cores are stacked, and each rotor core is skew by a specific angle in order to reduce cogging torque and torque ripple. I can.

According to an additional aspect of the present invention, a plurality of rotor cores are formed in a vertical direction at the center of a magnetic flux barrier formed in the rotor core between vertical buried grooves, so that cogging torque and torque ripple. A number of notches may be included to further reduce ).

The present invention can solve the problem that permanent magnets buried in the rotor core are separated from and scattered from the rotor core, so that the motor can be stably operated at high speed, while vibration and noise of the motor can be reduced, thereby enabling quiet operation.

In addition, the present invention has an effect of improving motor performance by reducing cogging torque and torque ripple.

1 is a side view showing the configuration of an embodiment of a rotor having a permanent magnet scattering prevention structure according to the present invention.
2 is a perspective view showing an example of a rotor core of a rotor having a permanent magnet scattering prevention structure according to the present invention.
3 is a view illustrating that a permanent magnet is embedded in a rotor core of a rotor having a permanent magnet scattering prevention structure according to the present invention.
4 is a view illustrating that a retainer and a stopper are coupled to a rotating shaft of a rotor having a permanent magnet scattering prevention structure according to the present invention.
5 is a diagram illustrating a reduction in cogging torque and torque ripple of a rotor having a permanent magnet scattering prevention structure according to the present invention.
6 is a diagram illustrating a reduction in torque ripple of a rotor having a permanent magnet scattering prevention structure according to the present invention.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through preferred embodiments described with reference to the accompanying drawings. Although specific embodiments are illustrated in the drawings and related detailed descriptions are described, this is not intended to limit the various embodiments of the present invention to a specific form.

In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the embodiments of the present invention, the detailed description will be omitted.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

1 is a side view showing the configuration of an embodiment of a rotor having a permanent magnet scattering prevention structure according to the present invention, FIG. 2 is a rotor core of a rotor having a permanent magnet scattering prevention structure according to the present invention A perspective view showing an example, FIG. 3 is a view illustrating that a permanent magnet is embedded in a rotor core of a rotor having a permanent magnet scattering prevention structure according to the present invention.

1 to 3, the rotor 100 having a permanent magnet scattering prevention structure according to this embodiment includes a rotating shaft 110, a rotor core 120, and a plurality of permanent magnet pieces. 130, and an upper retainer (retainer) 140 and a lower retainer (150).

The rotating shaft 110 has a rotor core 120 inserted and fixed, and a magnetic field generated by a current flowing through a coil (not shown) mounted on a stator (not shown) of the motor and mounted on the rotor 100 It rotates along the rotating rotor 100 by the interaction of the permanent magnets to provide rotational driving force.

The rotor core 120 is inserted and fixed to the rotation shaft 110, and a plurality of vertical buried grooves 121 are radially formed along the periphery of the outer edge. In this case, a plurality of vertical buried grooves 121 radially formed along the outer periphery of the rotor core 120 may be formed in multiple layers so as to have different radii in the horizontal direction around the rotation shaft 110.

Referring to FIG. 2, it can be seen that a plurality of vertical buried grooves 121 are radially formed along the outer periphery of the rotor core 120. Meanwhile, it can be seen that a rotation shaft insertion groove 122 for inserting the rotation shaft 110 is formed in the center of the rotor core 120. The rotation shaft 110 is inserted through the rotation shaft insertion groove 122 so that the rotor core 120 is coupled to the rotation shaft 110.

Meanwhile, according to an additional aspect of the invention, a plurality of rotor cores 120 are stacked, and each rotor core is skew by a specific angle in order to reduce cogging torque and torque ripple. ) Can be implemented.

At this time, although not shown in the drawing, convex-shaped protrusions are formed on the upper surface of the lower rotor core to be assembled with each other, and concave grooves are skewed by a specific angle on the lower surface of the upper rotor core. It is formed, so that the two rotor cores are skewed by a certain angle and are coupled to each other, so that each rotor core can be implemented in a prefabricated manner.

(A) of FIG. 2 illustrates that the rotor core 120 is stacked with two layers, and (b) shows that the rotor core 120 is stacked with four layers. Referring to (a) and (b) of FIG. 2, it can be seen that the rotor cores 120 of each layer are skewed so as to be shifted at a specific angle. It has been experimentally demonstrated that cogging torque and torque ripple can be reduced when the rotor core 120 is implemented in multiple layers and the rotor core 120 of each layer is skew. Can be derived.

5 is a diagram illustrating a reduction in cogging torque of a rotor having a permanent magnet scattering prevention structure according to the present invention. Referring to FIG. 5, it can be seen that when the rotor core 120 is implemented in multiple layers and the rotor cores of each layer are skewed, the cogging torque is significantly reduced compared to the case where the rotor cores are not skewed.

6 is a diagram illustrating a reduction in torque ripple of a rotor having a permanent magnet scattering prevention structure according to the present invention. Referring to FIG. 6, it can be seen that when the rotor core 120 is implemented in multiple layers and the rotor cores of each layer are skewed, the torque ripple is greatly reduced compared to the case where the rotor cores are not skewed.

Meanwhile, according to an additional aspect of the invention, the rotor core 120 may include a plurality of vertical through holes 123 radially formed inside the vertical buried groove 121 for weight reduction.

Referring to FIG. 2, it can be seen that a plurality of vertical through holes 123 are radially formed between the vertical buried grooves 121 of the rotor core 120 and the rotation shaft insertion groove 122 in the center. have. Since empty spaces are formed inside the rotor core 120 by the vertical through holes 123, the weight of the rotor core 120 can be reduced, thereby reducing the weight of the motor.

The plurality of permanent magnet pieces 130 are buried in vertical buried grooves 121 formed in the rotor core 120. 3 is a view illustrating that a permanent magnet is embedded in a rotor core of a rotor having a permanent magnet scattering prevention structure according to the present invention. Referring to FIG. 3, it can be seen that the permanent magnet pieces 130 are embedded in a plurality of vertical buried grooves 121 formed radially along the outer periphery of the rotor core 120.

The upper retainer 140 and the lower retainer 150 are inserted and fixed to the rotating shaft 110 in the upper and lower sides of the rotor core 120, respectively, so that a plurality of permanent magnet pieces 130 are vertical when the rotor core 120 is rotated. It prevents scattering away from the buried grooves 121. For example, the shape of the upper retainer 140 and the lower retainer 150 may be a disk shape in which a rotation shaft insertion groove is formed in the center, but is not limited thereto.

4 is a view illustrating that a retainer and a stopper are coupled to a rotating shaft of a rotor having a permanent magnet scattering prevention structure according to the present invention. As shown in FIG. 4, when the stepped portion 111 is formed on the rotation shaft 110 and the lower retainer 150 is inserted into the rotation shaft 110 through the rotation shaft insertion groove 151 formed in the center, the lower retainer ( 150) may be implemented so that it does not deviate from the rotation shaft 110 by being caught on the step 111.

A rotation shaft insertion groove formed in the center of the rotor core 120 in which the permanent magnet pieces 130 are buried in the vertical buried grooves 121 while the lower retainer 150 is caught in the rotation shaft 110 stepped 111 When the rotor core 120 is inserted into the rotation shaft 110 through 122, the lower retainer 150 covers the lower portion of the rotor core 120, so even if the rotor core 120 rotates at high speed, the lower retainer The permanent magnet pieces 130 embedded in the vertical buried grooves 121 are prevented from being separated from the outside through the lower portion of the rotor core 120.

On the other hand, when the upper retainer 140 is coupled to the rotary shaft 110 in which the lower retainer 150 and the rotor core 120 are sequentially coupled through the rotary shaft insertion groove 141 formed in the center of the upper retainer 140, the upper retainer 140 Since the upper portion of the rotor core 120 is covered by the retainer 140, the upper retainer 140 is embedded in the vertical buried grooves 121 even if the rotor core 120 rotates at high speed. ) Prevents them from being separated from the outside through the upper part of the rotor core 120.

By implementing in this way, the present invention can solve the problem that the permanent magnets embedded in the rotor core are separated from the rotor core and scatter in the vertical direction, so that the motor can be stably operated at high speed while reducing vibration and noise of the motor. Yes, quiet driving is possible. In addition, it is possible to reduce cogging torque and torque ripple, thereby improving motor performance.

Meanwhile, according to an additional aspect of the present invention, the rotor 100 having a permanent magnet scattering prevention structure may further include a stopper 160. The stopper 160 binds the upper retainer 140 inserted and fixed to the rotation shaft 110 so that it does not deviate from the rotation shaft 110.

For example, the stopper 160 has a rotation shaft insertion groove 161 formed in the center, and a plurality of coupling protrusions 162 coupled corresponding to the plurality of coupling grooves 142 formed in the upper retainer 140 are formed on the bottom surface. It may be in the form of a disk, but is not limited thereto.

The upper retainer 140 is coupled to the rotary shaft 110 in which the lower retainer 150 and the rotor core 120 are sequentially coupled through the rotary shaft insertion groove 141 formed in the center of the upper retainer 140, and then formed in the center. The stopper 160 is inserted into the rotation shaft 110 through the rotation shaft insertion groove 161.

And, by coupling a plurality of coupling protrusions 162 formed on the bottom of the stopper 160 to a plurality of coupling grooves 142 formed in the upper retainer 140, the upper retainer 140 is rotated by the stopper 160 ).

At this time, the flow prevention protrusion 163 is formed by protruding from the rotation shaft insertion groove 161 of the stopper 160, and when the stopper 160 is inserted into the rotation shaft 110, the guide groove ( By forming 112 on the rotation shaft 110, the stopper 160 may be implemented so that it does not idle separately from the rotation of the rotation shaft 110.

Meanwhile, according to an additional aspect of the invention, the rotor core 120 may further include a plurality of notches 124. A plurality of notches 124 are formed in a vertical direction at the center of the magnetic flux barrier formed in the rotor core between the vertical buried grooves 121 to further reduce cogging torque and torque ripple. Reduce.

The IPMSM (Interior Permanent Magnet Synchronous Motor) is a structure in which a plurality of permanent magnet pieces 130 are embedded in the rotor core 120 of the rotor 100, and reluctance torque is generated. .

Accordingly, compared to a surface-mounted permanent magnet synchronous motor (SPMSM: Suface Permanent Magnet Synchronous Motor), not only electromagnetic torque but also rotor reluctance torque can be used, which has the advantage of high output, but relatively large cogging torque and torque ripple. Occurs.

Cogging torque is a cause of noise and vibration of the motor, and reduction of cogging torque is essential for improving motor performance and safety. Methods for reducing cogging torque have been studied in various fields.

If skew is applied to reduce the cogging torque and the pole/slot ratio is changed, the cogging torque can be reduced, but there are various limitations in the design and manufacturing process. The method of applying the skew has the disadvantage of increasing the cost during the manufacturing process, and the method of changing the pole/slot combination is often limited in design.

In contrast, when the shapes of the rotor and stator are changed in order to reduce the cogging torque, it is relatively easy to manufacture, and the cogging torque can be simply reduced. If the shape of the rotor and stator is changed, the air gap changes and the air gap magnetic flux density changes. This means a change in magnetic field energy and can reduce cogging torque.

In this embodiment, a plurality of notches 124 are formed in the center of the magnetic flux barrier formed in the rotor core between the vertical buried grooves 121 in a vertical direction to increase the cogging torque, which is proportional to the cogging torque. By reducing the radial flux density, cogging torque and torque ripple are further reduced.

As described above, the present invention can solve the problem that the permanent magnets buried in the rotor core are separated from the rotor core and scattered, so that the motor can be stably operated at high speed while reducing the vibration and noise of the motor. Since it is operable and can reduce cogging torque and torque ripple to improve motor performance, the object of the present invention presented above can be achieved.

The various embodiments disclosed in the present specification and drawings are only provided for specific examples to aid understanding, and are not intended to limit the scope of the various embodiments of the present invention.

Therefore, the scope of the various embodiments of the present invention is included in the scope of the various embodiments of the present invention in addition to the embodiments described herein, all changes or modified forms derived based on the technical idea of the various embodiments of the present invention. It should be interpreted as being.

The present invention can be used industrially in the field of technology related to an interior permanent magnet synchronous motor (IPMSM) and its application technology.

100: rotor
110: rotating shaft
111: step
112: guide groove
120: rotor core
121: vertical buried groove
122: rotary shaft insertion groove
123: vertical through hole
124: notch
130: permanent magnet
140: upper retainer
141: rotary shaft insertion groove
142: coupling groove
150: lower retainer
151: rotary shaft insertion groove
160: stopper
161: rotary shaft insertion groove
162: coupling protrusion
163: flow prevention protrusion

Claims (5)

A rotating shaft;
A rotor core which is inserted and fixed to the rotating shaft and in which a plurality of vertical buried grooves are radially formed along an outer periphery;
A plurality of permanent magnet pieces buried in vertical buried grooves formed in the rotor core;
An upper retainer and a lower retainer that are inserted and fixed to the rotating shaft at both sides of the rotor core to prevent the plurality of permanent magnet pieces from being separated from and scattered from the vertical buried grooves when the rotor core is rotated;
A rotor having a structure to prevent scattering of permanent magnets. The method of claim 1,
A rotor with a permanent magnet shatterproof structure:
A stopper for binding the upper retainer inserted and fixed to the rotation shaft so as not to deviate from the rotation shaft;
A rotor having a permanent magnet scattering prevention structure further comprising. The method according to claim 1 or 2,
Rotor iron core:
In order to reduce the weight, a plurality of vertical through holes formed radially inside the vertical buried groove;
A rotor having a structure to prevent scattering of permanent magnets. The method according to claim 1 or 2,
Rotor iron core:
A rotor with a permanent magnet scattering prevention structure in which a plurality of stacked, each rotor core is skewed by a specific angle in order to reduce cogging torque and torque ripple. The method of claim 4,
Rotor iron core:
A plurality of notches formed in a vertical direction at the center of the magnetic flux barrier formed in the rotor core between the vertical buried grooves to further reduce cogging torque and torque ripple;
A rotor having a structure to prevent scattering of permanent magnets.

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