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

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.

scholarly journals Design and Optimization of a High-Speed Switched Reluctance Motor

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6733
Author(s):  
Stefan Kocan ◽  
Pavol Rafajdus ◽  
Ronald Bastovansky ◽  
Richard Lenhard ◽  
Michal Stano
Keyword(s):  
Permanent Magnet ◽  
Output Power ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Switched Reluctance ◽  
Design And Optimization ◽  
Reluctance Motor

Currently, one of the most used motor types for high-speed applications is the permanent-magnet synchronous motor. However, this type of machine has high costs and rare earth elements are needed for its production. For these reasons, permanent-magnet-free alternatives are being sought. An overview of high-speed electrical machines has shown that the switched reluctance motor is a possible alternative. This paper deals with design and optimization of this motor, which should achieve the same output power as the existing high-speed permanent-magnet synchronous motor while maintaining the same motor volume. The paper presents the initial design of the motor and the procedure for analyses performed using analytical and finite element methods. During the electromagnetic analysis, the influence of motor geometric parameters on parameters such as: maximum current, average torque, torque ripple, output power, and losses was analyzed. The analysis of windage losses was performed by analytical calculation. Based on the results, it was necessary to create a cylindrical rotor shape. The rotor modification method was chosen based on mechanical analysis. Using thermal analysis, the design was modified to meet thermal limits. The result of the work was a design that met all requirements and limits.

Torque ripple reduction of switched reluctance motor using fuzzy control

2016 ◽  
Vol 33 (6) ◽  
pp. 1668-1679 ◽  
Author(s):  
Ming-Shyan Wang ◽  
Seng-Chi Chen ◽  
Wei-Chin Fang ◽  
Po-Hsiang Chuang
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Control ◽  
Pulse Width Modulation ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Motor Speed ◽  
Content Type ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Future Work

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.

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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