Abstract
In this paper, by evaluating the extreme value of the qth-power current, a torque sharing function (TSF) family for reducing the torque ripples in the switched reluctance motor (SRM) is proposed. The optimization criteria of the TSF has two secondary objectives, including the maximization of the torque-speed range and the minimization of copper loss. The evaluation indices in terms of the peak phase current, the rms (root mean square) phase current, and the torque ripple factor are compared between the proposed TSF family and four conventional TSFs including linear, sinusoidal, exponential, and cubic TSFs. An optimization objective function that combines the maximum absolute value of the rate-of-change of the flux linkage (MAV-RCFL) and the qth-power of current is proposed and a weighting factor is used to balance the influence of the two optimization objectives. An optimal TSF can be easily obtained by solving the optimization problem from the TSF family. The proposed TSF is validated by using simulations and experiments with a three-phase 6/4 SRM with 7.5 kW, 3000 rpm, and 270 V DC-link voltage. The dynamic simulation model is implemented in Matlab/Simulink. The results demonstrate the validity and superiority of the proposed control method; the optimal TSF provides better torque-speed performance, and a better reduction in copper loss and torque ripples at high speed, as compared to conventional TSFs.
Highlights
Switched reluctance motors (SRMs) are gaining interest in various applications such as electric vehicle driving system, starter-generators system, and power supply for aerospace applications, because of the many advantages that the switched reluctance motor (SRM) have in comparison to other motors, including their low cost, durability, simple structure and robust construction [1,2]
In the “Torque-to-Current” block, the phase torque references are converted into phase current references the rewritten torque-current profile model of the SRM (Equation (18))
A hysteresis current controller is used for the phase current tracking its reference waveforms
Summary
Switched reluctance motors (SRMs) are gaining interest in various applications such as electric vehicle driving system, starter-generators system, and power supply for aerospace applications, because of the many advantages that the SRMs have in comparison to other motors, including their low cost, durability, simple structure and robust construction [1,2]. In order to obtain an optimum TSF, it is necessary to consider a secondary objective that includes the maximization of the torque-speed range and the minimization of copper loss These two evaluation criteria affect the torque-speed performance and the drive efficiency of the motor. In [21], an offline TSF with a wide torque-speed range for reducing torque ripple in an SRM was studied; the objective function adopted a Tikhonov factor among two objectives to minimize the maximum absolute value of RCFL and the copper loss. In this paper, taking into account the requirements for the maximization of the torque-speed range and the minimization of copper loss and balancing these secondary objectives by including a weighing factor, a family of TSFs deduced by an invertible torque function is proposed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
