ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Optimization analysis of rectangular rotor slot of cage induction motor operating with aero variable frequency power
Received date: 2014-02-10
Revised date: 2014-04-14
Online published: 2014-04-21
Currently high power aero-generators start to adopt variable frequency power output ranging from 360 Hz to 800 Hz, the most distinct influence of which is low starting torque of induction motor at high frequency when the variable frequency power is supplied directy. An analytical method is proposed to optimize the rectangular rotor slot of cage induction motor for starting torque maximization under the premise of invariant steady-state performance. Skin effect coefficient and slot leakage are affected by slot modification and will produce both positive and negative effects on starting torque. Combining the two factors, a dynamic rotor parameter model including slot sizes and frequency is established to revise the traditional torque formula and the starting torque equation regarding rotor slot sizes is obtained, which gains ground for the starting torque optimization. The rotor slot of a 7.5 kW induction motor is optimized with analytical method. Simulation and tests were conducted to verify the starting characteristics of the motor under aero variable frequency power supply, which verified the effectiveness of the optimization method for rectangular rotor slot.
DU Xiaofei , HOU Yanze , SUN Chu , ZHOU Yuanjun . Optimization analysis of rectangular rotor slot of cage induction motor operating with aero variable frequency power[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(2) : 614 -624 . DOI: 10.7527/S1000-6893.2014.0052
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