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Permanent magnet synchronous motor

A permanent magnet synchronous and motor technology, applied in the field of motors, can solve the problems of demagnetization of permanent magnets of fluctuating rotors, and achieve the effects of improving stability, improving rigidity and preventing demagnetization.

Inactive Publication Date: 2012-07-04
岳群生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a permanent magnet synchronous motor in order to solve the problem that the rotor permanent magnet of the existing permanent magnet synchronous motor will be demagnetized when the motor load fluctuates greatly or the motor is out of step due to overload.

Method used

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Examples

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Embodiment 1

[0039] A permanent magnet synchronous motor, including a stator, and a rotor; the stator includes a casing, a stator core, and a stator winding; the rotor includes a steel shaft 1, and an even number of tile-shaped permanent magnets 2 evenly arranged on the steel shaft 1, phase The polarity of the adjacent permanent magnet 2 is opposite; the rotor also includes a magnetic steel sleeve 3 pressed on the outer surface of the permanent magnet 2, and the magnetic steel sleeve 3 is evenly opened with grooves 4 whose number is consistent with the number of the permanent magnet 2. The bottom of the groove 4 forms a magnetic isolation magnetic bridge 5; each gap between the adjacent permanent magnets 2 is directly opposite to each groove 4; the opening of the groove 4 faces the outside of the magnetic steel sleeve 3, such as figure 1 shown;

[0040] During specific implementation, the thickness of the magnetic steel sleeve 3 is designed according to the actual working conditions of the...

Embodiment 2

[0043] A permanent magnet synchronous motor, including a stator, and a rotor; the stator includes a casing, a stator core, and a stator winding; the rotor includes a steel shaft 1, and an even number of tile-shaped permanent magnets 2 evenly arranged on the steel shaft 1, phase The polarity of the adjacent permanent magnet 2 is opposite; the rotor also includes a magnetic steel sleeve 3 pressed on the outer surface of the permanent magnet 2, and the magnetic steel sleeve 3 is evenly opened with grooves 4 whose number is consistent with the number of the permanent magnet 2. The bottom of the groove 4 forms a magnetic isolation magnetic bridge 5; each gap between adjacent permanent magnets 2 is directly opposite to each groove 4; the opening of the groove 4 faces the inner side of the magnetic steel sleeve 3, such as figure 2 shown;

[0044]During specific implementation, the thickness of the magnetic steel sleeve 3 is designed according to the actual working conditions of the ...

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Abstract

The invention relates to a motor, in particular to a permanent magnet synchronous motor. The permanent magnet synchronous motor is used for solving the problem a permanent magnet of a rotor of the existing permanent magnet synchronous motor is demagnetized when load of the motor is in greater fluctuation or overload out-of-step. The permanent magnet synchronous motor comprises a stator and the rotor, wherein the stator comprises a housing, a stator iron core and a stator winding; the rotor comprises a steel shaft and an even number of tile-shaped permanent magnets which are uniformly arrangedon the steel shaft, and polarities of the adjacent permanent magnets are reverse; and the rotor further comprises a magnetic conductive steel bushing which is press-mounted on the outer side surface of the permanent magnets, grooves in the consistent number with the permanent magnets are uniformly formed on the magnetic conductive steel bushing, and the bottoms of the grooves constitute a flux barrier. By using the permanent magnet synchronous motor, the problem that the permanent magnet of the rotor of the existing permanent magnet synchronous motor is demagnetized when the load of the motoris in greater fluctuation or overload out-of-step can be effectively solved, and the permanent magnet synchronous motor is applicable to the motors which need to change speed in numerical control machines, paper-making, spinning, chemical industry and various industries and fields.

Description

technical field [0001] The invention relates to a motor, in particular to a permanent magnet synchronous motor. Background technique [0002] In the existing technology, the permanent magnet synchronous motor is composed of a stator and a rotor. The stator is generally an asynchronous motor stator (Y series), and the rotor is composed of a steel shaft and a permanent magnet. The distance from the rotor permanent magnet to the stator core is generally 0.3- About 1.0mm, this size is called the air gap length in the technical parameters of the motor. During the operation of the existing permanent magnet synchronous motor, when the load fluctuates greatly or the load is out of step, the rotor permanent magnet will demagnetize, thereby causing the motor to fail. The reasons for the demagnetization of the rotor permanent magnet are as follows: when the motor load fluctuates greatly Or when overloaded and out of step, the stator will generate a strong magnetic field that is 7-10 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/14H02K1/27
Inventor 岳群生
Owner 岳群生