Abstract
This paper presents the design and implementation of an application-specific integrated circuit (ASIC) for a discrete-time current control and space-vector pulse-width modulation (SVPWM) with asymmetric five-segment switching scheme for AC motor drives. As compared to a conventional three-phase symmetric seven-segment switching SVPWM scheme, the proposed method involves five-segment two-phase switching in each switching period, so the inverter switching times and power loss can be reduced by 33%. In addition, the produced PWM signal is asymmetric with respect to the center-symmetric triangular carrier wave, and the voltage command signal from the discrete-time current control output can be given in each half period of the PWM switching time interval, hence increasing the system bandwidth and allowing the motor drive system with better dynamic response. For the verification of the proposed SVPWM modulation scheme, the current control function in the stationary reference frame is also included in the design of the ASIC. The design is firstly verified by using PSIM simulation tool. Then, a DE0-nano field programmable gate array (FPGA) control board is employed to drive a 300W permanent-magnet synchronous motor (PMSM) for the experimental verification of the ASIC.
Highlights
The AC motor drives, including induction motors (IM), permanent-magnet synchronous motor (PMSM) drives, synchronous reluctance motors (SynRM), and others, have been very popular, being applied to electric vehicles, railway traction engines, and industrial applications such as CNC tools and robots, because they have higher power density and efficiency as compared to DC motor drives [1,2,3,4]
Sensorless and direct torque control (DTC) cooperating with an space-vector pulse-width modulation (SVPWM) scheme for a flux-modulated permanent-magnet wheel motor and induction motor has been described owing to several advantages, such as low torque/flux ripples in motor drive and reduced direct axis current, over the conventional hysteresis direct torque control method when the motor is operated at a light or a sudden increased load [34,37,38,39,40]
This paper describes the design and implementation of an application-specific integrated circuit (ASIC) for a discrete-time current control and space-vector pulse-width modulation (SVPWM) with asymmetric five-segment switching scheme AC motor drives
Summary
The AC motor drives, including induction motors (IM), permanent-magnet synchronous motor (PMSM) drives, synchronous reluctance motors (SynRM), and others, have been very popular, being applied to electric vehicles, railway traction engines, and industrial applications such as CNC tools and robots, because they have higher power density and efficiency as compared to DC motor drives [1,2,3,4]. This paper describes the design and implementation of an application-specific integrated circuit (ASIC) for a discrete-time current control and space-vector pulse-width modulation (SVPWM) with asymmetric five-segment switching scheme AC motor drives. It can reduce the computation load of a microprocessor or DSP, and reduce the power transistor switching loss of the inverter.
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