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This paper proposes a novel control scheme for maximum power operation of synchronous reluctance motors. The proposed scheme consists of a combination of maximum torque per ampere control, maximum torque per flux control, flux-weakening control and torque limiting. The first three control methods are based on a mathematical model in a rotating reference frame that is synchronized with the stator flux-linkage...
This paper examines the torque response based on direct torque control (DTC) for an interior permanent magnet synchronous motor (IPMSM). DTC with a PI controller for torque control is used in this study. The relationship between the gains of the PI controller and the torque response is derived based on the transfer function of the torque control loop. Also, this paper discusses the influence of the...
This paper proposes the position sensorless drive system for PMSM, in which the inverter is controlled by a six- step square-wave operation at high speed in order to increase the torque and power at high speed region and expand the operating range. The speed and position are estimated based on the estimation of an extended electromotive force, and the sensorless control is achieved not only in the...
This paper proposes a high-powered control of sensorless PMSM drive by applying a square-wave operation at high-speed. The sensorless control is based on the estimation of an extended electromotive force (EMF) in the rotating reference frame, and the sensorless control is applied not only in the current vector control region by the PWM control of the inverter but also in the square-wave operating...
This paper proposes a position sensorless drive system combined with on-line parameter identification for an interior permanent magnet synchronous motor. The accuracy of the position estimation can be improved by the proposed system, in which the motor parameters used for the position estimation are identified according to the operating conditions. First, the influence of the parameter error on the...
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