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This paper proposes a control schema for permanent magnet machines, which is synthesized by field-oriented control, synchronous pulse width modulation and phase-lock loop based sampling synchronization. Switching frequency of inverters in electric locomotive applications is limited by considering switching losses. Lower switching frequency deteriorates performance of machines, e.g., extra machine...
This paper gives a study on the EMI noise problem of motor drives, especially the impact of application of fast-switching SiC devices. First, the noise source model has been analyzed and the two major factors: device switching action and inverter switching frequency have been claimed. Device switching performance analysis has been done to show that the fast switching speed will generate bigger EMI...
This paper presents a novel variable switching frequency PWM method for torque ripple control of three-phase AC motors. First, the switching torque ripple model is analyzed through the PWM current ripple in the motor. Based on the switching torque ripple prediction model, variable switching frequency PWM is developed to control the torque ripple maximum value. With this method, the switching losses...
Axial flux PM machines, featured by compact size and high performance, are suitable for powertrains of electric vehicles. This paper studies the design and control of a totally enclosed axial flux PM integrated- starter-generator system. Torque density and volume benefits from large number of pole pairs when designing PM machines. However, the increased pole pair number decreases the switching-frequency-to-electrical-period...
This paper give a overall study of phase-shift PWM in three-phase voltage source converters. By changing the phase-shift of carrier waves, the pulse locations will be changed and impact the system performance. This paper gives a tool to study and predict phase-shift PWM's effect: calculating the six rising and falling edges of the phase voltage in each switching cycle and deriving the voltage and...
High performance operation of high-speed electric machine leads to a demand on high switching frequency, which results in inverter heating, short lifespan, large heat sink, etc. In this paper, high-speed permanent magnet synchronous machine drive with IGBT based three-level T-type inverter (3LT2I) and two-level inverter are investigated and the losses in the machine and inverter are compared. A 200kW...
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