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Permanen magnet synchronous motor

A permanent magnet synchronous motor technology, applied in the field of motors, can solve the problems that the motor cannot work normally, the torque characteristics of the motor are deteriorated, and the starting of the motor is affected. Effect of small torque ripple

Inactive Publication Date: 2006-04-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-order harmonic flux density interacts with the stator current to generate harmonic torque, which is superimposed on the fundamental torque, resulting in fluctuations in output torque
Especially when the motor is running at low speed, the harmonic torque is large, which will not only deteriorate the torque characteristics of the motor, but also affect the starting of the motor.
If the vibration caused by the harmonic torque is close to the natural vibration frequency of the motor, it will also cause the motor to resonate and make the motor unable to work normally

Method used

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as figure 1 As shown, the specific embodiment of the external magnetic field (or internal magnetic pole) motor of the present invention is composed of a stator 110, a rotor 120 and the like. The stator 110 includes a stator slotless iron core 111 , an armature winding 112 and a stator frame 113 . The rotor 120 includes a magnetic pole fixing sleeve 121 , a permanent magnetic pole 122 , a rotor yoke 123 and a rotating shaft 124 . The cogged core 111 in the stator 110 is made of silicon steel sheets and is fixed with the machine base 113; each winding element of the three-phase or multi-phase armature winding 112 is formed by winding, and then bonded or mechanically fixed on the surface of the stator slotless iron core 111 to form an air gap winding 112 . Each magnet block of the permanent magnet pole 122 is bonded to the rotor yo...

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Abstract

Rotor of the permanent magnet synchronous motor is composed of permanent magnetic pole, fixing sheath of magnetic pole, yoke and shaft. Array of Halbach magnet is adopted for constituting permanent magnetic pole. That is to say magnetic pole is composed of single magnet pieces with variational magnetization direction according to rule; and the formed magnetization direction of magnetic pole are along radial. Adjusting number of magnet piece and magnetization direction can generate and enhance spatial magnetic field in sinusoid shape in air gap. The stator is consists of iron cores, windings and stator frame. The iron core is in structure without slot. Windings in three phases or multiple phases are arranged on surface of stator iron cores to form windings with air gaps in order to eliminate high order harmonic caused by slot effect. The motor can generate strong magnetic field, depresses or eliminates torque fluctuation, especially in time of running at low speed.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a permanent magnet synchronous motor. technical background [0002] Synchronous motor is a kind of power machinery that can be used to drive various machinery, such as air compressors, blowers, water pumps, machine tools, electric vehicles, ships, etc. Compared with the asynchronous motor of the same capacity, the synchronous motor has the advantages of high power factor, high efficiency, and can improve the power factor of the grid. Used in conjunction with the power electronic frequency conversion power supply, it can make the synchronous motor realize self-starting and speed-regulating operation. With the development of power electronics technology, the cost of variable frequency power supply is reduced, and the use of synchronous motors will become more and more extensive. [0003] The conventional synchronous motor with electric excitation structure has electric excitation poles on i...

Claims

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Application Information

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IPC IPC(8): H02K21/12H02K1/27H02K1/16
Inventor 杜玉梅杨劼金能强李耀华史黎明
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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