scholarly journals Comparison of an Off-Line Optimized Firing Angle Modulation and Torque Sharing Functions for Switched Reluctance Motor Control

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2435
Author(s):  
Peter Bober ◽  
Želmíra Ferková
Keyword(s):  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Modulation Method ◽  
Objective Functions ◽  
Fem Model ◽  
Switched Reluctance ◽  
Motor Efficiency ◽  
Reluctance Motor ◽  
Sharing Function ◽  
Angle Modulation

In this paper, a comparison of the simple firing angle modulation method (FAM) and the more advanced torque sharing function (TSF)-based control of switched reluctance motor (SRM) is presented. The off-line procedure to tailor and optimize the parameters of chosen methods for off-the-shelf SRM is explained. Objective functions for optimization are motor efficiency, torque ripple, and integral square error. The off-line optimization uses a finite element method (FEM) model of the SRM. The model was verified by measurement on the SRM. Simulation results showed that FAM has comparable efficiency to TSF, but has a much higher value of torque ripple. The presented off-line procedure can be used for single or multi-objective optimization.

scholarly journals A High-Performance Indirect Torque Control Strategy for Switched Reluctance Motor Drives

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Cunhe Li ◽  
Cunshan Zhang ◽  
Jian Liu ◽  
Dunxin Bian
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Torque Control ◽  
Modulation Method ◽  
Switched Reluctance ◽  
Current Controller ◽  
Torque Control Strategy ◽  
Reluctance Motor

This paper proposes a high-performance indirect control scheme for torque ripple minimization in the switched reluctance motor (SRM) drive system. Firstly, based on the nonlinear torque-angle characteristic of SRM, a novel torque sharing function is developed to obtain the optimal current profiles such that the torque ripple is minimized with reduced copper losses. Secondly, in order to track current accurately and indirectly achieve high-performance torque control, a robust current controller is derived through the Lyapunov stability theory. The proposed robust current controller not only considers the motor parameter modeling errors but also realizes the fixed frequency current control by introducing the pulse width modulation method. Further, a disturbance-observer-based speed controller is derived to regulate the motor speed accurately, and the load torque is considered an unknown disturbance. The simulations and experiments on a 1.5 kW SRM prototype are carried out to demonstrate the effectiveness of the proposed high-performance indirect torque control strategy. Results verify the superiority of the proposed strategy with respect to the torque ripple suppression, system efficiency, and antidisturbance.

scholarly journals Torque Ripple Minimization of a Switched Reluctance Motor using a Torque Sharing Function based on the Overlap Control Technique

2020 ◽  
Vol 10 (2) ◽  
pp. 5371-5376
Author(s):  
H. A. Maksoud
Keyword(s):  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Control Technique ◽  
Magnetic Characteristics ◽  
Motor Speed ◽  
Element Analysis ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Table Model ◽  
Sharing Function

The torque ripple produced in a switched reluctance motor (SRM) can be seen as one of its major drawbacks. It occurs mainly due to the sequential switching of the motor phases and changes in the length of the air gap. The torque sharing functions (TSFs) are the more effective and favorable techniques developed to reduce the torque ripple in SRMs. However, the time responses of instantaneous torque for incoming and outgoing phases during commutation period (CP) are different. In addition, with increasing motor speed the CP decreases and the torque response of the outgoing phase oversteps it. In this paper, a modified torque sharing function based on the change of the overlap angle during the commutation process depending on the motor speed is presented. In the designed control algorithm of the TSFs, the motor speed is has become an input besides the rotor position and the torque command. The commutation time is precisely adjusted enough for the commutating process. The proposed method gives good results in a wide speed range. To deduce the magnetic characteristics of the SRM, finite element analysis (FEA) is applied and a look-up table model is derived. The effectiveness and robustness of the proposed control technique are exhibited in the simulation results.

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