Effect of the temperature field of permanent magnet synchronous servo motor with rotor sheath caused by current harmonics
LI Weili
DU Linkui
LI Dong
LI Jinyang
WANG Jiajun
Abstract：To solve the problem that the temperature rise of the permanent magnet of synchronous servo motor with rotor sheath are heavy,a 2000 r/min,12.5 kW permanent magnet servo motor is taken as the research object,temperature rise of permanent magnet motor caused by frequency conversion driving is studied.Rated phase current of prototype driving by inverter is tested firstly.Value of current harmonics is calculated through Fourier decomposition.Secondly,transient electromagnetic field equations of permanent magnet motor are established,eddy current losses of sheath caused by different current harmonics is calculated.On this basis,a permanent magnet servo motor domain-dimensional finite element model of temperature field is established;temperature distribution of the motor is solved.After analysis,a conclusion that higher harmonic of winding current,the number of which is closed to the carrier wave ratio of control circuit,would cause obvious temperature rises in permanent magnet is proposed.Finally,the calculation of the temperature field of motor and the measured results are compared,the correctness of the calculation results is verified.
Keywords：permanent magnet servo motorscurrent time harmoniceddy current losstemperature rise of the permanent magnettemperature field
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 98-105 )