Abstract
This paper focuses on the evaluation of the operation of permanent magnet brushless DC (PM BLDC) motor through the control implemented in the natural reference frame (a-b-c frame) and the stationary reference frame ($\alpha-\beta$ frame). To a large extent, ripple-free torque and attainment of higher torque-speed characteristic depend on the gating pulses/switching patterns of the inverter employed. PM BLDC motor requires injection of the square wave current for the maximum torque per ampere, so the reference is required to be generated and tracked accordingly. The effectiveness of the strategies of pulse-width-modulation-based current control in the a-b-c plane and, the case of single-voltage-vector model predictive control and proposed two-voltage-vector model predictive control in the stationary plane have been evaluated. The parameter for comparison is based on improved tracking performance of the reference, ease in analysis of the control technique and less complexity in implementation of the control. The analysis has been verified through experimentation, with the control implemented through C2000 TMS320F28335 microcontroller commenting on the advantages of the stationary-plane-based approach.
Highlights
Permanent magnet brushless DC (PM BLDC) motors are employed in many applications like medical, aerospace, light electric vehicles, and robotics. due to its advantages such as simple control, high power-to-weight ratio and efficiency as compared to other motors of other types and same size
This paper focuses on the improved tracking performance of the proposed two-voltage-vector model predictive control in stationary frame as compared to the existing single-voltage-vector model predictive control in stationary reference frame and the PWM control in a-b-c reference frame
Three phase PM BLDC motor is supplied by three-phase two-level voltage source inverter (VSI) as shown in Figure 1 in which each phase has phase voltage as van, vbn, vcn ; back-EMFs ea, eb, ec ; phase currents ia, ib, ic ; resistance R ; and inductance L
Summary
Permanent magnet brushless DC (PM BLDC) motors are employed in many applications like medical, aerospace, light electric vehicles, and robotics. due to its advantages such as simple control, high power-to-weight ratio and efficiency as compared to other motors of other types and same size. Analysis of phase commutation in PM BLDC motor is shown in [5] with a conclusion that torque ripple can be 50% at low speed and –50% at high speed with phase current controlled method. Detailed analysis of stationary reference frame applied to PM BLDC motor with experimental validation is shown in [19]. In [20], for nonideal back-EMF by applying the stationary frame of reference, the reference current is generated and injected with suitable harmonics for torque-ripple-free operation in PM BLDC motor.
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