This paper proposes a new current vector control method that prevents voltage saturation by regulating the rate of pulse width modulation (PWM) in a flux weakening region according to a reference. While conventional methods use current limiting on both axes (d-axis and q-axis), our method stabilizes the current vector at onset to and within the flux weakening region using only q-axis current signal control. By eliminating the control of the d-axis current, the circuitry of the field programmable gate array (FPGA) is simplified. The effectiveness of the proposed method is verified through experiments of load fluctuations and supply voltage variations.
This paper presents a new estimation method of rotor position to achieve a position sensorless control for surface permanent magnet synchronous motor. DC current adds to SPMSM and nonlinear observer is applied to the torque equation to estimate the rotor position from the induced voltage while the motor is vibrating. When the error of the measured and calculated induced voltage is converged, the estimated rotor position is converged to the real value. The validity of the proposed method is verified by the experiment.
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