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Torque Feedforward Control Technique for Permanent-Magnet Synchronous Motors

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2 Author(s)
Bing Cheng ; Hybrid & Electr. Drives, Continental Automotives, Dearborn, MI, USA ; Tesch, T.R.

This paper proposes a torque control method for interior permanent-magnet (IPM) motors operating in a wide speed range requiring high torque/power accuracy and a fast dynamic response. Using the fact that the motor parameters are nonlinear and significantly vary with direct and quadrature current operating points, a new optimal operating plane is generated. This operating plane combines the maximum torque per ampere (MTPA) curve, current limit circle, and maximum torque per volt (MTPV) curve, voltage limitations, and torque calculation under the nonlinear parameter variations. As a result, new feedforward tables are generated, which make full use of measured motor parameters. The new torque and flux regulators built around the feedforward tables provide a fast dynamic response and accurate steady-state torque/power production. The proposed controller was implemented and successfully tested on a 105-kW IPM motor electric drive used in a fuel-cell vehicle program.

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Industrial Electronics, IEEE Transactions on  (Volume:57 ,  Issue: 3 )