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An online monitoring method for permanent magnet temperature of permanent magnet synchronous motor rotor

A permanent magnet synchronous motor, permanent magnet technology, applied in motor control, electrical components, control systems, etc., can solve the problem of inaccurate rotor temperature

Active Publication Date: 2021-02-26
SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This assumption is inconsistent with the principle and reality that there is a certain temperature difference between the actual stator and rotor temperature, so this method has the inaccuracy of the measured rotor temperature

Method used

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  • An online monitoring method for permanent magnet temperature of permanent magnet synchronous motor rotor
  • An online monitoring method for permanent magnet temperature of permanent magnet synchronous motor rotor
  • An online monitoring method for permanent magnet temperature of permanent magnet synchronous motor rotor

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Embodiment Construction

[0067] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0068] The online monitoring method of the permanent magnet temperature of a kind of permanent magnet synchronous motor rotor provided by the present invention comprises the following steps:

[0069] Step 1. According to the inherent residual magnetic induction temperature coefficient K of the permanent magnet material br , The residual magnetic induction intensity B of the permanent magnet at room temperature 20°C r20 and co...

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Abstract

In an existing rotor temperature detecting method of a permanent magnet synchronous motor, it is assumed that the temperatures of a stator and a rotor are equal, which is inconsistent with a principleand reality that the temperatures of the stator and the rotor are different, and therefore, the e rotor temperature measured by an existing method is inaccurate. In order to solve the above technicalproblem, the present invention discloses an on-line monitoring method for the permanent magnet temperature of a permanent magnet synchronous motor rotor, and the method is used for the on-line monitoring of the rotor permanent magnet temperature of a running permanent magnet synchronous motor to avoid the cost increase and reliability reduction of the temperature monitoring of the motor rotor permanent magnet brought by the setting of a temperature sensor.

Description

technical field [0001] The invention relates to a method for detecting the temperature of a rotor permanent magnet of a permanent magnet synchronous motor, belonging to the technical field of motors. Background technique [0002] The permanent magnet synchronous motor rotor is excited by permanent magnets. The residual magnetic induction and coercive force of permanent magnets such as alnico, ferrite, and neodymium iron boron decrease with the increase of temperature. This loss of magnetic properties due to temperature rise can be divided into reversible loss and irreversible loss. As the reversible loss decreases to the original value as the temperature, its residual magnetic induction and coercive force will also return to the original value. Irreversible loss refers to the part of the magnetic properties that cannot return to the original value after temperature recovery, which can be divided into irrecoverable loss and recoverable loss. Irrecoverable loss refers to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/60
CPCH02P29/67
Inventor 王建辉姚丙雷韦福东顾卫东
Owner SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT