Welcome to Journal of Automotive Safety and Energy,
汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2013, Vol. 4 ›› Issue (1): 87-92.DOI: 10.3969/j.issn.1674-8484.2013.01.013

• Automotive Energy Efficiency & Environment Protection • Previous Articles    

Approximate calculation of electric-vehicle inverter power-loss in
two control strategies

ZHU Yuan1, LI Gensheng2, WU Zhihong1, TIAN Guangyu3   

  1. 1. Sino-German School for Postgraduate Studies, Tongji University, Shanghai 200092, China;
    2. Vehicle and Power Engineering Institute, Henan University of Science and Technology, Luoyang 471003, China
    3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2013-01-30 Online:2013-03-25 Published:2013-03-27

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Abstract: An approximation method for calculating inverter power loss was proposed to guide selecting power
module and design heat sink with higher efficiency of permanent magnet synchronous motors for space vector
pulse width modulations (SVPWM) which are widely used in the electric vehicle drive system. Power losses in
different vector sectors were calculated using this method, and then compared according to the characteristics
and parameters of insulated gate bipolar transistors (IGBTs) for two drive-system control-strategies of
permanent magnet synchronous motors. For one control strategy, the d-axis armature current is zero (), and the
other is with the maximum torque per Ampere (MTPA). The results show that the total power loss of the inverter
under the MTPA control strategy is smaller than that for the other control strategy, thereby resulting in lower
temperature rise of inverter heat sink.

Key words: electric vehicles, permanent magnet synchronous motors, inverters, approximate calculation,
space vector pulse width modulation (SVPWM), power loss, efficiency of drive system

CLC Number: