Switched reluctance motor speed performance simulation study based on torque ripple suppression

Purpose – Extensive efforts have been conducted on the improvement of torque ripple in switched reluctance motor (SRM) drive. The purpose of this paper is to estimate initial on time of pulse-width modulation (PWM) and turn-off angle using the motor speed and rotor angle by fuzzy logic. Design/methodology/approach – A fuzzy logic control together with the PWM technique and turn-off angle are used to improve torque ripple and dynamic response. Findings – After determining initial on time of PWM, the rise slope of phase current is increased. Research limitations/implications – Future work will consider to increase the complex of the fuzzy control to adaptively tune parameters and achieve excellent results. Practical implications – The experimental results of the proposed method are presented to show the effectiveness. Originality/value – This paper achieves SRM control by one special PWM technique which is seldom studied.

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Development of Hydraulic Pump Drive System Using Switched Reluctance Motor with Servo Function

Journal of Robotics and Mechatronics ◽

10.20965/jrm.2020.p0984 ◽

2020 ◽

Vol 32 (5) ◽

pp. 984-993

Author(s):

Ha Tham Phan ◽

Seiya Itagaki ◽

Yasukazu Sato ◽

Keyword(s):

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Switched Reluctance Motor ◽

Torque Ripple ◽

Motor Speed ◽

Hydraulic Motor ◽

Hydraulic Pump ◽

Switched Reluctance ◽

Pump Flow Rate ◽

Reluctance Motor

A switched reluctance motor (SRM) generates a reluctance torque without the power of a permanent magnet, rendering it a candidate for rare-earth free motors. Compared with a permanent magnet synchronous motor (PMSM), SRMs also offer operational advantage in high-temperature environments owing to their robust structure. However, SRMs are generally inferior to PMSMs in terms of torque ripple, noise, and speed control, in particular. Therefore, this study attempts to improve the controllability of SRMs by proposing an SRM driving method in the form of a bidirectional rotation torque and a speed-controllable servomotor. The advantage of this method is evaluated experimentally using a closed-loop hydraulic system (valveless control system), which includes a hydraulic pump driven by an SRM to supply hydraulic power to actuators. The results show that the pump flow rate and hydraulic motor speed are consistent with the sinusoidal commands corresponding to the forward and reverse rotations of the SRM.

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

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.3389 ◽

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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