Real-time monitoring method for rotor temperature of high-speed permanent magnet motor

A permanent magnet motor, real-time monitoring technology, applied in the direction of thermometer, control generator, motor control, etc., can solve the problem of difficult rotor permanent magnet temperature, real-time monitoring, etc.

Pending Publication Date: 2022-06-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain the back electromotive force only acted by the permanent magnet during the experiment, the motor needs to be powered off, and it is difficult to monitor the temperature of the rotor permanent magnet in real time during operation

Method used

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  • Real-time monitoring method for rotor temperature of high-speed permanent magnet motor
  • Real-time monitoring method for rotor temperature of high-speed permanent magnet motor
  • Real-time monitoring method for rotor temperature of high-speed permanent magnet motor

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Embodiment Construction

[0036] The technical solutions of the present invention are further described below with reference to the accompanying drawings.

[0037] like figure 1 As shown, the present invention also provides a monitoring method for a real-time monitoring system for the rotor temperature of a high-speed permanent magnet motor, comprising the following steps:

[0038] step one:

[0039] When the high-speed permanent magnet motor is completely cooled to room temperature, measure and record the ambient temperature at this time, denoted as t 1 ; During the operation of the high-speed permanent magnet motor, it is necessary to maintain the ambient temperature t1 constant. According to the fixed temperature coefficient α of the permanent magnet material in a certain temperature range Br , 20 ℃ permanent magnet residual magnetic flux density B r20 , get the ambient temperature as t 1 When the permanent magnet residual magnetic flux density B r (t 1 ), the formula is:

[0040] B r (t 1...

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Abstract

The invention discloses a real-time monitoring method for the rotor temperature of a high-speed permanent magnet motor, and the method comprises the following steps: (1), measuring and recording the environment temperature at the moment when the high-speed permanent magnet motor is cooled to the room temperature, and recording the environment temperature as t1; obtaining the residual magnetic flux density Br (t1) of the permanent magnet when the environment temperature is t1; (2) obtaining phase current values of three phases of the high-speed permanent magnet motor stator and converting the phase current values into direct-axis current Id and quadrature-axis current Iq under a two-phase coordinate system; acquiring a load air gap potential E delta of the high-speed permanent magnet motor; the no-load back electromotive force E0 of the high-speed permanent magnet motor is calculated; (3) acquiring no-load main magnetic flux phi delta 0 according to the no-load back electromotive force E0 of the high-speed permanent magnet motor; (4) calculating the residual magnetic flux density Br (t2) of the permanent magnet when the real-time temperature is t2 by using the no-load main magnetic flux phi delta0; and (5) finally obtaining the real-time temperature t2 of the rotor according to the residual magnetic flux density Br (t2) of the permanent magnet when the real-time temperature is t2. The temperature of the high-speed permanent magnet motor rotor can be monitored in real time in the operation process.

Description

technical field [0001] The invention relates to the technical field of high-speed motors, in particular to a real-time monitoring method for rotor temperature of a high-speed permanent magnet motor. Background technique [0002] The temperature monitoring object of high-speed permanent magnet motor is mainly two parts: stator winding and rotor permanent magnet, which is also the monitoring of the temperature of the core components of the motor. When monitoring the temperature of a high-speed permanent magnet motor, it is relatively easy to monitor the temperature of the non-rotating part, while the corresponding rotor permanent magnet temperature monitoring is the temperature monitoring of rotating objects, which is technically challenging. The heat dissipation conditions of the high-speed permanent magnet motor rotor are relatively poor, and excessive temperature rise will lead to demagnetization of the permanent magnet or even irreversible demagnetization. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/66H02P21/14H02P25/022G01K7/36
CPCH02P29/662H02P29/67H02P21/14H02P25/022G01K7/36H02P2207/05
Inventor 刘凯歌邓智泉许欣庞古才
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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