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High speed permanent magnet motor rotor with shield

A technology of permanent magnet motor and shielding layer, applied in the direction of magnetic circuit rotating parts, magnetic circuit, electromechanical devices, etc., can solve the problems of large eddy current loss of motor rotor, irreversible demagnetization of permanent magnet, affecting motor stability, etc., and achieve eddy current loss. Reduce, facilitate installation, ensure the effect of mechanical performance

Active Publication Date: 2022-01-18
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, due to its small size and high frequency, the eddy current loss of the motor rotor is very large, and it is difficult to dissipate heat.
When the temperature of the permanent magnet rises too high, it will cause irreversible demagnetization of the permanent magnet, which will affect the stability of the motor operation

Method used

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  • High speed permanent magnet motor rotor with shield
  • High speed permanent magnet motor rotor with shield
  • High speed permanent magnet motor rotor with shield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The comparison of the eddy current loss of the shielding cylinder of the present invention, the existing shielding cylinder and the rotor without shielding cylinder.

[0065] Taking a 15kW, 20,000rpm surface-mounted permanent magnet synchronous motor as an example, the thickness of the shielding cylinder 6 of the motor is 0.3mm, and the sheath is a carbon fiber sheath with a thickness of 1.5mm. The influence of the rotor structure change on the eddy current loss of the rotor is calculated. . The result is as Figure 8 As shown, it can be seen from the figure that the eddy current loss of the rotor with the shielding layer of the present invention is significantly reduced. Compared with the traditional shielding layer, the eddy current loss is reduced by 8.7%, and compared with that without the shielding layer, the eddy current loss is reduced by 16.51%. It is proved that the shielding cylinder reduces the total eddy current loss generated on the rotor, effectively redu...

Embodiment 2

[0068] Research on the eddy current loss of the outer fillet radius of the hollow rectangular structure.

[0069] The present invention obtains the change of eddy current loss when the ratio of the outer fillet radius of the hollow rectangular structure of the shielding cylinder 6 to the tile circumferential arc length of the permanent magnet 3 is different under the condition that the size of the eddy current is constant.

[0070] from Figure 10 It can be seen that the radius of the outer fillet of the hollow rectangular structure has a significant impact on the eddy current loss. When the radius of the outer fillet is between 1 / 10 and 3 / 20 of the circumferential arc length of the tile of the permanent magnet 3, the resistance is the smallest , especially the ratio of the outer fillet radius R to the tile circumferential arc length of 1 / 8 is the minimum eddy current loss, indicating that the use of inner and outer fillet structures can effectively reduce the resistance of th...

Embodiment 3

[0072] For the distance between the outer side of the rectangle of the hollow structure and the inner side, mark a to study the eddy current loss.

[0073] Such as Figure 11 As shown, when the distance between the outer side and the inner side of the rectangle of the hollow structure is marked as 0.5, it means that the hollow part is completely covered by a high-conductivity material, and there is no low-conductivity part in the middle.

[0074] according to Figure 11 It can be seen that when the hollow part of the hollow rectangular structure is filled with low-conductivity materials, the eddy current loss of the rotor is lower. When a is one-eighth of the circumferential arc length of the permanent magnet, the shielding effect is poor, which is higher than that of the hollow part. The conductivity material increased by 1.17% when covered. When a is 1 / 4 of the circumferential arc length of the permanent magnet tile, it is 5.9% lower than when the hollow part is covered wi...

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Abstract

The invention belongs to the technical field of permanent magnet motors, in particular to a high-speed permanent magnet motor rotor with a shielding layer. The rotor structure includes a sheath, a permanent magnet, and a rotating shaft. The permanent magnet is arranged on the rotating shaft, and the rotor sheath is placed on the outside; a shielding layer is placed outside the permanent magnet, and the permanent magnet and the rotating shaft are connected by a glue layer. One side of the shielding layer A heat dissipation plate is provided, and the heat dissipation plate is connected to the shielding cylinder at the other end of the shielding layer; the high conductivity part of the shielding cylinder is formed into a cylindrical shape surrounded by a plurality of hollow rectangular structures with chamfers, the hollow rectangular structure hollow part and the hollow rectangular structure Between the chamfers is the low conductivity part. Existing permanent magnet motors have problems such as large eddy current loss of the rotor and poor heat dissipation of the rotor. Based on the prior art, the present invention provides a composite material with a heat dissipation plate and a shielding layer that can effectively reduce rotor loss and temperature rise high-speed permanent magnet motor rotor.

Description

Technical field: [0001] The invention belongs to the technical field of permanent magnet motors, in particular to a high-speed permanent magnet motor rotor with a shielding layer. Background technique [0002] High-speed motors are small in size and high in power density. Under the same power level, the size and weight of high-speed motors are usually much smaller than those of low- and medium-speed motors, which can effectively save materials and reduce costs. But at the same time, due to its small size and high frequency, the eddy current loss of the motor rotor is very large, and it is difficult to dissipate heat. When the temperature of the permanent magnet rises too high, it will cause irreversible demagnetization of the permanent magnet, which will affect the stability of the motor operation. Therefore, how to reduce the eddy current loss of the rotor and improve the cooling condition of the rotor is an important research topic. Contents of the invention [0003] P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/278H02K1/28H02K9/22
CPCH02K1/278H02K1/28H02K9/22
Inventor 佟文明孙鲁张红奎吴胜男侯明君
Owner SHENYANG POLYTECHNIC UNIV