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Self-starting permanent magnet synchronous motor of magnetism and electricity conducting composite tooth structure

A permanent magnet synchronous motor, compound tooth technology, applied in synchronous motors with static armatures and rotating magnets, magnetic circuit shape/style/structure, magnetic circuit rotating parts, etc., can solve the problem of large current and long starting time , power waste and other problems, to achieve the effect of large torque, small speed fluctuation and strong eddy current effect

Active Publication Date: 2013-12-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these occasions, the small starting torque will cause long starting time and large current during the starting process. These factors will cause waste of electric energy.

Method used

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  • Self-starting permanent magnet synchronous motor of magnetism and electricity conducting composite tooth structure
  • Self-starting permanent magnet synchronous motor of magnetism and electricity conducting composite tooth structure
  • Self-starting permanent magnet synchronous motor of magnetism and electricity conducting composite tooth structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] Embodiment example of the present invention is described in detail below in conjunction with accompanying drawing and basic principle:

[0023] Such as figure 1 As shown, a self-starting permanent magnet synchronous motor with a new magnetic and conductive composite tooth structure is mainly in that the rotor core 3 is pressed from silicon steel sheets, the top of the motor rotor is made of magnetic and conductive solid composite material 4, and the rotor is made of yellow The cage bar made of copper or the cast aluminum cage bar 5 is close to the surface of the rotor, the permanent magnet 6 can adopt a built-in tangential magnetic circuit structure, and the magnetic isolation ring 2 is used between the permanent magnet 6 and the rotating shaft 1; The thickness of the solid composite material 4 is determined by the magnetic and conductive properties of the composite material. By adjusting the size of the composite material 4, a small starting current and a large startin...

Embodiment approach 2

[0031] There is a dovetail groove 7 on the teeth of the laminated iron core in contact with the composite tooth material. The composite material used in the dovetail groove 7 is connected with the tile-type composite material. When installing, the composite material in the shape of the dovetail groove 7 flows from the The end is passed into the dovetail groove 7, and the effect of centrifugal force can be overcome by the structure of the dovetail groove 7, such as image 3 . The basic principle of operation is the same as that of Embodiment 1, and it is also applicable to occasions of frequent starting and heavy-load starting.

Embodiment approach 3

[0033] By optimizing the structure of the compound tooth part, adjusting its width and thickness to reduce the eddy current loss when the motor runs stably. Figure 4 A schematic diagram of the adjusted structure is given. The composite material is placed in the dovetail groove 7 to overcome the centrifugal force during operation. The starting principle is the same as that of Scheme 1. After the solid body stabilizes, the eddy current loss is 2.59kW, and the eddy current loss of the compound tooth is only 2.14kW, but the starting time is about 0.4s longer than that of the solid rotor. Therefore, it can be seen that the starting performance of this scheme is better than that of the laminated rotor, and at the same time, the eddy current loss generated in the stabilized solid composite material is smaller than the eddy current loss generated by the ordinary solid iron core rotor, which effectively improves the efficiency. Therefore, this solution is suitable for the long-term ru...

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Abstract

The invention discloses a self-starting permanent magnet synchronous motor of a magnetism and electricity conducting composite tooth structure. A rotor of the self-starting permanent magnet synchronous motor comprises a rotor core, multiple cage strips, multiple permanent magnets, a magnetism insulating ring and a rotation shaft. Composite teeth are formed at the tops of rotor core teeth with magnetism and electricity conducting composite materials. The rest of the core forms a rotor laminated core in an overlying mode with a silicon steel sheet. The composite tooth structure is tightly connected with the outer surface of the rotor laminated core. The permanent magnets are evenly distributed in the rotor laminated core with a built-in tangential magnetic structure. The magnetism insulating ring is arranged between the permanent magnets and the rotation shaft. The rotation shaft is sleeved with the annular magnetism insulating ring. The cage strips of the rotor are identical with cage strips of an opened groove of an ordinary rotor in terms of structure. The composite materials on the tops of the teeth are strong in eddy current effect, large in torque, little in rotation speed fluctuation, capable of assisting starting of the motor, capable of further optimizing the sizes of the composite materials and capable of effectively improving the efficiency of the motor.

Description

technical field [0001] The invention relates to the technical field of self-starting permanent magnet synchronous motors, in particular to a self-starting permanent magnet synchronous motor with a magnetic-conductive and conductive composite tooth structure. Background technique [0002] AC asynchronous motor has small power factor and relatively low efficiency, and permanent magnet motor can overcome this shortcoming, but permanent magnet motor has the characteristics of difficulty in starting. For this reason, people have studied self-starting permanent magnet synchronous motor, because it satisfies both It meets the starting requirements and solves the shortcomings of low power factor and low efficiency during stable operation. However, in some occasions where the motor starts frequently or the motor load changes frequently, the starting torque and starting current of the motor have attracted much attention. In these occasions, the small starting torque will cause long s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/14H02K1/27
Inventor 李伟力李金阳李文亮王蒲瑞王耀玉
Owner BEIJING JIAOTONG UNIV
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