Motor, compressor and refrigeration equipment

A stator and winding technology, applied in compressors, mechanical equipment, lighting and heating equipment, etc., can solve problems such as the decline of motor anti-demagnetization ability

Active Publication Date: 2020-08-18
ANHUI MEIZHI PRECISION MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that the reduction of heavy rare earth content in permanent magnets will cause a decrease of more than 40% in the anti-demagnetization ability of the motor

Method used

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  • Motor, compressor and refrigeration equipment
  • Motor, compressor and refrigeration equipment
  • Motor, compressor and refrigeration equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 with figure 2 As shown, a motor includes: a stator and a rotor. The stator includes a stator core 110 and a winding (not shown in the figure), the stator core 110 is provided with a plurality of stator teeth 111 , and the winding is wound around the plurality of stator teeth 111 . The rotor includes a rotor core 210 and a permanent magnet 220 , and the permanent magnet 220 is disposed on the rotor core 210 . Wherein, the ratio of the number of stator teeth 111 and the phase number of the winding is configured to be suitable for adjusting the strength of the demagnetization reverse magnetic field generated by the winding energization.

[0050] The motor proposed by the present invention adjusts the demagnetization reverse magnetic field intensity generated by winding energization by designing the ratio of the number of stator convex teeth 111 to the phase number of windings, that is, adjusting the reverse direction of demagnetization of permanent magn...

Embodiment 2

[0060] On the basis of the first embodiment above, the value range of the mass percentage of dysprosium and / or terbium in the permanent magnet 220 is further limited to 0 to 0.5%, or the value range of the mass percentage of heavy rare earth elements in the permanent magnet 220 is 0 to 0.5%.

[0061] In this embodiment, since dysprosium and terbium are heavy rare earth elements, heavy rare earth elements are national strategic resources. Therefore, by limiting the mass percent of dysprosium and / or terbium in the permanent magnet 220 to 0 to 0.5%, and / or limiting the mass percent of heavy rare earth elements in the permanent magnet 220 to 0 to 0.5%, it is beneficial to ensure In the case of good anti-demagnetization ability of the motor, the use of heavy rare earth elements such as dysprosium and terbium is reduced, and the consumption of strategic resources is reduced, which in turn helps to reduce the manufacturing cost of the motor and improve the cost performance of the mot...

Embodiment 3

[0068] On the basis of any of the above embodiments, it is further defined that the intrinsic coercive force of the permanent magnet 220 at 20° C. is less than or equal to 1800 kA / m.

[0069] In order to meet the demand for demagnetization current of household air conditioners, the intrinsic coercive force of the NdFeB permanent magnet 220 used in the frequency conversion models of compressor manufacturers in the related art is greater than or equal to 1830kA / m at 20°C. The permanent magnets 220 under force all contain heavy rare earth elements, especially the elements dysprosium and terbium. In order to reduce the dependence on heavy rare earth elements, even if no heavy rare earth permanent magnet 220 is used, the intrinsic coercive force of the permanent magnet 220 will drop below 1800kA / m. However, due to the reduction of the intrinsic coercive force, the demagnetization capability of the motor in the related art (the motor in the related art is listed here having 9 slots ...

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Abstract

The invention provides a motor, a compressor and refrigeration equipment. The motor comprises: a stator, wherein the stator comprises a stator core and a winding, the stator core is provided with a plurality of stator convex teeth, and the winding is wound on the plurality of stator convex teeth; and a rotor which comprises a rotor iron core and a permanent magnet, and the permanent magnet is arranged on the rotor iron core, and the ratio of the number of the stator convex teeth to the phase number of the windings is configured to be suitable for adjusting the demagnetization reverse magneticfield intensity generated by energization of the windings. The ratio of the number of the stator convex teeth to the phase number of the windings is designed; the demagnetization reverse magnetic field intensity generated by electrifying the winding is adjusted; and even if the permanent magnet is lack of heavy rare earth elements such as dysprosium and terbium; however, the ratio of the number ofthe stator convex teeth to the phase number of the windings can still be increased, and the demagnetization reverse magnetic field generated by energization of the winding is reduced, so that the demagnetization reverse magnetic field is not enough to demagnetize the permanent magnet, the demagnetization resistance of the whole motor is improved, and the motor which can reduce heavy rare earth elements and ensure the demagnetization resistance of the motor is provided.

Description

technical field [0001] The invention belongs to the technical field of refrigeration equipment, and in particular relates to a motor, a compressor and a refrigeration equipment. Background technique [0002] At present, in the field of air conditioner compressors, frequency conversion motors have become the mainstream technology, especially with the newly promulgated energy efficiency level standards for household air conditioners in 2019, fixed speed models have gradually withdrawn from the market, and the era of all frequency conversion has come. In order to adapt to the application environment of household air conditioners, most of the permanent magnets of variable frequency motors are NdFeB permanent magnets containing heavy rare earth elements and high intrinsic coercive force. Strategic resources of heavy rare earth elements (especially dysprosium and terbium) are also increasing year by year. In order to reduce the consumption of strategic resources, non-heavy rare e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/14H02K3/52H02K3/28H02K1/27F04B35/04F25B31/02
CPCH02K1/146H02K3/522H02K3/28H02K1/2766F04B35/04F25B31/02H02K2213/03F25B31/026H02K1/02H02K1/276H02K21/16
Inventor 邱小华张德金陈超杨森
Owner ANHUI MEIZHI PRECISION MFG
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