Motors, compressors 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: 2021-08-31
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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  • Motors, compressors and refrigeration equipment
  • Motors, compressors and refrigeration equipment
  • Motors, compressors and refrigeration equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 and 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 magne...

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 includes: a stator, the stator includes a stator core and windings, the stator core is provided with a plurality of stator convex teeth, and the winding is wound on a plurality of stator convex teeth; the rotor, the rotor includes a rotor core and a permanent magnet, and the permanent magnet is arranged on the rotor The iron core; the ratio of the number of stator teeth and the number of phases of the winding is configured to be suitable for adjusting the strength of the demagnetizing reverse magnetic field generated by electrifying the winding. By designing the ratio of the number of stator convex teeth to the phase number of the winding, the strength of the demagnetization reverse magnetic field generated by the electrification of the winding can be adjusted, so that even if the permanent magnet lacks heavy rare earth elements such as dysprosium and terbium, it can still increase the stator convex teeth. The ratio of the number to the number of winding phases is used to reduce the demagnetization reverse magnetic field generated by the winding energization, so that the demagnetization reverse magnetic field is not enough to demagnetize the permanent magnet, improve the overall anti-demagnetization ability of the motor, and then help to propose a method that meets the requirements of reducing weight. Rare earth elements can also ensure the motor's ability to resist demagnetization.

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 Patents(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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