Hollow cup structure motor with sunflower-shaped inner rotor

An inner rotor and coreless technology, applied in the field of coreless structure motors, can solve the problems of high harmonic content of the air gap magnetic field, affecting the distribution of the air gap magnetic field, and affecting the performance of the motor, so as to improve the air gap magnetic density waveform and improve the motor performance. Performance, reasonable effect of air gap radial thickness variation

Active Publication Date: 2021-07-09
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the uniform radial thickness of the air gap of the traditional coreless motor, the radial air gap reluctance is consistent, which affects the distribution of the air gap magnetic field, making the air gap magnetic field have a large harmonic content and poor sine, which affects the performance of the motor

Method used

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  • Hollow cup structure motor with sunflower-shaped inner rotor
  • Hollow cup structure motor with sunflower-shaped inner rotor
  • Hollow cup structure motor with sunflower-shaped inner rotor

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Embodiment Construction

[0034] In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0035] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways than described here; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, and Not all examples.

[0036] combine figure 1 , figure 2 , Figure 4 and Figure 5 As shown, the coreless motor with a sunflower-shaped inner rotor provided by the embodiment of the present disclosure includes: an outer rotor core 1, a plurality of permanent magnets 2, an eccentric inner rotor core 4 and a rotor ...

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Abstract

The invention relates to the technical field of motors, and especially relates to a hollow cup structure motor with a sunflower-shaped inner rotor. The coreless structure motor with the sunflower-shaped inner rotor comprises an outer rotor iron core, a plurality of permanent magnets, an eccentric inner rotor iron core and a rotor shaft. Along the radial cross section of the rotor shaft, the external contour of the eccentric inner rotor core comprises a plurality of eccentric arcs protruding towards the permanent magnets, the number of the eccentric arcs is consistent with that of the permanent magnets, and the eccentric arcs are in one-to-one correspondence with the permanent magnets. The two end points of the eccentric arc are located on the connecting line of the two side edges of the corresponding permanent magnet and the center of the rotor shaft, and the circle center of the eccentric arc is located on the connecting line of the middle point of the arc edge of the corresponding permanent magnet and the center of the rotor shaft, so that the air-gap flux density waveform of the motor is improved, the harmonic content in an air-gap magnetic field is reduced, and the air-gap magnetic field approaches sine waves, therefore, the back electromotive force waveform of the coreless motor is improved, the torque pulsation is reduced, and the performance of the motor is improved.

Description

technical field [0001] The present disclosure relates to the technical field of motors, in particular to a hollow-cup motor with a sunflower-shaped inner rotor. Background technique [0002] Coreless permanent magnet motors are mostly used in high-speed applications and require high speed regulation accuracy. Therefore, most of them have sinusoidal phase current drive control. The sinusoidal phase current needs to interact with the opposite electromotive force of the sinusoidal wave to reduce the electromagnetic torque. pulsation. However, in the traditional coreless permanent magnet motor, the 3rd, 5th, and 7th harmonic content in the back EMF waveform is relatively large, which causes the motor to generate electromagnetic torque pulsation and affects the performance and efficiency of the motor. The main reason for the large harmonic content of the back electromotive force waveform of the hollow cup type permanent magnet motor is that the sinusoidal waveform of the air gap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/22H02K1/27H02K16/02H02K29/03
CPCH02K1/22H02K1/2786H02K16/02H02K29/03H02K2213/03H02K2201/03Y02T10/64
Inventor 孙津济邢亘孙皓熙郑世强徐学平
Owner BEIHANG UNIV
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