Abstract:
A motor control system includes a control module, a switching module, and a filtering module. The control module determines output voltages for operating a motor based on a torque demand. The switching module generates switching signals for an inverter that drives the motor. The switching module generates the switching signals based on the output voltages. The switching module generates an out-of-volts (OOV) signal according to a comparison based on the output voltages, a maximum duty cycle, and a voltage of a direct current (DC) bus that provides power to the inverter. The filtering module generates an OOV amount by filtering the OOV signal. The control module selectively limits the torque demand based on the OOV amount.
Abstract:
A power inverter control adjusts input power to track with output power to reduce energy handling requirements for an inverter DC bus. Input power to the power inverter circuit is measured and compared with a measurement of inverter output power. The comparison result is applied to a power factor correction circuit to adjust input power to track with output power, while obtaining a good power factor for the power inverter circuit. The energy requirements and ripple voltages or ripple currents on the DC bus are reduced, leading to a reduction in rating specifications for passive energy storage elements on the DC bus.
Abstract:
A control system for a motor includes a pulse-width modulation module, a pulse skip determination module, and a duty cycle adjustment module. The pulse-width modulation module generates three duty cycle values based on three voltage requests, respectively. A plurality of solid-state switches control three phases of the motor in response to the three duty cycle values, respectively. The pulse skip determination module generates a pulse skip signal. The duty cycle adjustment module selectively prevents the plurality of solid-state switches from switching during intervals specified by the pulse skip signal.
Abstract:
PROBLEM TO BE SOLVED: To reduce loss due to passing of a compensation current by outputting the compensation current to a section other than a section where a leakage current is not remarkable.SOLUTION: A converter 11 receives an alternate current from an AC power supply 3, and smooths the alternate current to output it to a DC link 15. An inverter 14 is connected to the converter 11 via the DC link 15, converts a direct current into an alternate current, and outputs the alternate current to a load 4. A leakage current detector 21 outputs a detection current Ib corresponding to a leakage current Ia leaking from the load 4. A compensation-current output terminal 223 is connected to a place 41 where the leakage current Ia is leaked, and outputs a compensation current Ic that compensates the leakage current Ia according to the detection current Ib. A switch 8 sets whether or not to permit the input of the detection current Ib to a compensation-current output section 22.