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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 introduces the differential-mode circulating current (DMCC) and zero-sequence circulating current (ZSCC) reduction method for paralleled inverters with zero common-mode (CM) PWM algorithm. By analyzing the reason of current jump in phase-leg, the method based on the freedom of PWM signal exchange and active voltage vector sequence exchange can be adopted which can keep volt-seconds balance...
This paper introduces a paralleled three-phase four-leg inverters and the corresponding pulse width modulation (PWM) method for the purpose of reduction the common mode current (CMC) and common mode electromagnetic interference (EMI). Considering the control principle of three-phase four-leg to limit the common mode voltage and the characteristic of paralleled inverters, the simple PWM scheme for...
Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different...
This paper investigated and compared two types of modified model predictive control methods with finite set for six-phase PMSM MTPA control. The first one has conventional cascaded speed and current controller loops where the PI current loop is replaced with a MPC control loop. The second method uses one MPC controller in place of conventional cascaded loops for both speed and current control. The...
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...
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