A method for online measurement of rotor permanent magnet temperature of surface-mounted permanent magnet synchronous motor
A technology of permanent magnet synchronous motor and measurement method, which is applied in the estimation/correction of motor parameters, motor control, AC motor control, etc., and can solve the problems of complicated test process and low test accuracy of permanent magnet synchronous motor rotor temperature, and achieve The effect of maintaining reliable operation, low cost and simple method
Active Publication Date: 2022-04-19
南京双南威动科技有限公司
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Problems solved by technology
[0006] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides an online measurement method for the permanent magnet temperature of the surface-mounted permanent magnet synchronous motor rotor, which can effectively solve the problem of the complicated test process of the rotor temperature of the permanent magnet synchronous motor, low test accuracy and online The real-time measurement problem is of great significance to ensure the safe operation of the motor and guide the optimal design of the permanent magnet synchronous motor
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[0024] The present invention will be further described below in conjunction with specific examples.
[0025] Such as figure 1 As shown, a method for online measurement of the rotor permanent magnet temperature of a surface-mounted permanent magnet synchronous motor involved in the present invention, its specific operation process is as follows:
[0026] 1) Select a surface-mounted three-phase permanent magnet synchronous motor with a rated power of 1.6kW, a rated voltage of 200V, a rated current of 6.2A, and a rated speed of 4500r / min as the measurement object. The permanent magnet material of the motor is N35EH. It is controlled by the commercial frequency converter with Id=0. First, use a mercury thermometer to record the ambient temperature at the moment the motor starts T 1 , T 1 at 19°C, the T 1 As the initial temperature of the permanent magnet of the motor rotor. Then, use the frequency converter to control the motor so that its speed quickly rises from 0 to the...
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The invention discloses an online measurement method for the rotor permanent magnet temperature of a surface-mounted permanent magnet synchronous motor, which is used for online measurement of the rotor permanent magnet temperature of a surface-mounted permanent magnet synchronous motor adopting an Id=0 control mode. The principle of reversible change of residual magnetic induction intensity with temperature, by measuring the ambient temperature of the motor at the start time, the voltage value, current value and speed at the time of starting to the predetermined speed, and measuring the voltage value, current value and speed of the motor at any time when the motor is running, can be Real-time online monitoring of rotor permanent magnet temperature. The invention does not need to add temperature sensors and measuring coils, and does not need to cut off the power during the measurement process, and has the advantages of simple method, low cost and on-line measurement. This method not only plays an important role in maintaining the reliable operation of permanent magnet synchronous motors, but also provides an important reference for guiding the optimal design of the motor and improving its power density.
Description
technical field [0001] The invention relates to an online measurement method for the temperature of a surface-mounted permanent magnet synchronous motor rotor permanent magnet, which belongs to the technical field of motor measurement and control. Background technique [0002] Surface-mounted permanent magnet synchronous motor has the advantages of high performance, small size, high power density, simple structure, low manufacturing cost and small moment of inertia, and occupies an important position in drive systems such as automobiles and home appliances. However, when the surface-mounted permanent magnet synchronous motor is running, a large amount of eddy current loss will be generated in the rotor due to the influence of the motor's non-sinusoidal power supply and cogging. Due to the poor heat dissipation conditions of the rotor, a large amount of eddy current loss will cause the temperature of the rotor to rise. If the temperature of the rotor is too high, the magnetic...
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IPC IPC(8): H02P29/66H02P23/14H02P25/024H02P27/04
CPCH02P29/662H02P23/14H02P25/024H02P27/04H02P2207/055
Inventor 尤素刚
Owner 南京双南威动科技有限公司