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In an AC-DC-AC motor drive system, a beat phenomenon of the motor current occurs, especially in the over-modulation range with DC-link voltage ripple and low frequency carrier. We analyze this beat phenomenon and propose two beatless control methods. One modifies the carrier frequency in accordance with the motor speed within a narrow range, and as a result, the beat frequency can be shifted to a...
We propose a low-cost high-power-factor three-phase rectifier with a turn-on current suppression circuit. With the proposed suppression circuit, standard rectifier diodes can be used instead of fast-recovery diodes in the main diode bridge even with a pulse-width-modulation (PWM) frequency above 10 kHz of the bidirectional switches. We also propose a detection method of the ac source phase using only...
A three-phase PWM rectifier-inverter system for a PMSM drive with a single-chip micro-controller is presented. To reduce the cost of the system, the input/output currents and dc-link voltage are detected only using resistors. With the proposed sensorless control, neither an ac voltage/phase sensor nor a rotor speed/position sensor is needed in the system. All of the proposed control schemes can be...
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