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Current control method for asymmetric dual three-phase Permanent Magnet Synchronous Motor

Tongji University-Zhihong Wu, Weisong Gu, Yuan Zhu, Ke Lu
  • Technical Paper
  • 2020-01-0470
To be published on 2020-04-14 by SAE International in United States
Based on the vector space decomposition (VSD) transformation, the phase currents of the asymmetric dual three phase permanent magnet synchronous motor (ADT-PMSM) can be mapped into three orthogonal subspaces, i.e., α–β subspace, x-y subspace and O1-O2 subspace. The mechanical energy conversion takes place in the α–β subspace, while in the x-y and O1-O2 subspaces only losses are produced. With neutral points being isolated, O1-O2 subspace can be omitted. So the vector control algorithm can control the α–β and x-y subspaces separately to realize the four dimensional current control. In the α–β subspace, deviation decoupling control method is employed to realize the mechanical energy conversion, which is robust to the motor parameters. In order to reduce the 5th and 7th harmonic currents caused by the inverter nonlinearity and some other factors, a resonant controller is adopted based on a new synchronous rotating coordinate transformation matrix to implement the current closed loop control strategy in the x-y subspace. The resonant controller can track sinusoidal references of arbitrary frequencies of both positive and negative sequences with zero steady-state…
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Energy-Management Strategy for Four-Wheel Drive Electrohydraulic Hybrid System with Optimal Comprehensive Efficiency

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

Chongqing University, China-Yang Yang, Ke Lu, Chunyun Fu
  • Journal Article
  • 07-12-01-0004
Published 2019-08-22 by SAE International in United States
The four-wheel drive electric sport utility vehicle (SUV) requires high dynamic performance, and the front and rear axles are matched with a high-power motor. High-power motors operate under low-speed and low-torque conditions, with low efficiency and large power loss. To reduce the power loss under low-speed and low-load conditions, a hybrid system of front and rear dual motors and dual hydraulic pumps/motors is designed. A simulation model of a four-wheel drive SUV electrohydraulic hybrid system is constructed. Aiming at the optimal energy consumption, a dynamic programming algorithm is adopted to establish the driving control rules of the vehicle. Constrained by the Economic Commission for Europe Regulation No.13 (ECE R13), a braking-force distribution strategy for the front and rear axles is formulated. On the premise of satisfying the braking safety, regenerative braking is preferred, and the braking energy is recovered to the greatest extent possible. The optimal efficiency curve of the motor is identified, and an energy-management strategy based on the optimal efficiency curve of the motor is established. The comprehensive efficiency of the dual motor…
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