Aiming at the heat dissipation problem of power module  in  miniaturization  of  motor  controller,  an  innovative parallel MOSFET scheme is designed to replace the mainstream traditional  power  module.  Firstly, the  switching  time  in  the motor  SVPWM  control  is  analyzed,  and  the  loss  calculation method of MOSFET and IPM under different current conditions is  introduced  in  detail. According  to  the  calculated  device  loss and  external  heat  dissipation conditions,  the  heat  conduction network  models  of  parallelMOSFETs  and  integrated  module IPM  are  established.The  thermal  simulation  is designed  based on ANSYS software. The temperature rise experiment is carried out   by   means   of   motor   pair   dragging.   The   temperature difference  between  them  is  compared  under  the  conditions  of 100V  DC  bus  voltage  and  30A  output  current.The  simulation and experimental results show that the thermal performance of the  motor  controller  can  be  effectively  improved  by  using  the parallel  MOSFET  scheme  under  the  same  control  effect  and control  ability. This  provides  technical  support  for  Reliability Application of miniaturization of motor controller.

Parallel MOSFETs,IPM,loss calculation,ANSYS,thermal model,heat dissipation