Papers by Keyword: Torque Ripple

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Authors: Chao Mi, Hai Wei Liu, Ning Zhao, Yang Shen
Abstract: This paper represents a fast approach for reduction of torque ripple on brushless DC (BLDC) motor. From a classic motor model, a mathematics component of torque ripple is extracted. To reduce the ripple component, a small modification of PWM and an open-loop control algorithm are made in the inverter of BLDC motor. At last, our paper describes and analyzes the simulation results of this approach by using PSIM. Without any sensors or advanced controllers, this approach can work in most BLDC motor drivers just after software update.
Authors: Xiao Lei Zhang, Kui Hua Wu, Jian Wang, Wei Sun, Kui Zhong Wu, Peng Du
Abstract: Because torque ripple disturbance can be created when the brushless dc motor is communicating, In this paper, from two aspects of energy feedback and the torque ripple, H/L - PWM - ON control strategy is analyzed .And a simulation system is set up. Through the trials, it shows that H/L - PWM - ON strategy can efficiently complete the energy feedback, has small torque ripple, and fully proves the feasibility and practicability of this control strategy.
Authors: Shu Hong Wang, Pan Wu, Li Mei Wang
Abstract: To determine the control method using overlapping commutation overlap time, this article on the four-phase permanent magnet brushless DC motor torque ripple based on the analysis of the use of overlapping commutation torque ripple suppression in the overlap time were derived by Ansoft software calculated four-phase permanent magnet brushless DC motor parameters, using MATLAB/Simulink software and simulate the model, simulation results were derived.
Authors: Ke Yu Li, Fu Qing Tian, Jue Wang
Abstract: The torque ripple of torque motor has serious influence over control accuracy of electro-optical tracking servo turntable. In response to this defect, an adaptive backstepping sliding mode control algorithm was proposed. Firstly, the mechanism of torque ripple was analyzed, and the math model of which was set up. Then, based on the model of whole servo system, the sliding mode control and backstepping algorithm were combined to design adaptive backstepping sliding mode (ABSM) controller. Finally, a simulation experiment was finished to with compare control performance of ABSM controller and PID controller. The simulation results show that, compared with the control accuracy of the PID controller, ABSM controller enhances the robustness of system, and approves control accuracy of servo turntable evidently.
Authors: Wei Zhang, Ping Zhang, Xin Hao Zhang, Xiao Feng Shen
Abstract: This paper has proposed an efficient direct torque control strategy based on space vector modulation (SVM-DTC) for dual three-phase permanent magnet synchronous motor (DTP-PMSM), which is implemented in a synchronous reference frame aligned with the machine stator flux vector. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the continuous smooth response of the vector control and the rapid response of direct torque control are both achieved. Simulation studies of a 3KW DTP-PMSM are carried out. Simulation results show the improvement of the torque response, decrease of the torque ripple, the higher steady performance and better flux waveform.
Authors: Yan Jing Meng, Yao Hua Li, Meng Xiao Wang
Abstract: The DTC for PMSM possesses many advantages: simple control configuration, lesser parameters dependence and fast dynamic response and is a good choice for the drive of EV. But the DTC suffers from high torque ripples. The switching table is used as the hysteresis control rule that determines the control performance. An improved switching table is proposed based on effects of voltage vectors on the drive. Simulation results show this switching table can suppress torque ripple compared to the conventional switching table.
Authors: Guo Sheng Li, Jia Dan Wei, Chang Chun Chen, Bo Zhou, Chu Han
Abstract: The doubly salient electro-magnetic motor (DSEM) suffers from significant torque ripples when operating in the conventional angle control method. To weaken the effects of the torque ripples, the ripple generation mechanism is first analyzed in this paper. Then, the operation principle and steady state of the split-capacitor in DC-link of the half-bridge converter are discussed in detail, thus an optimized control strategy of the half-bridge converter is proposed for the DSEM drives. The simulation and experimental results verify that the optimized angle control strategy can alleviate the torque ripples effectively and improve the motor performance.
Authors: Da Fang Wang, De Ming Bu, Cheng Zhu, Chuan Wei Zhou
Abstract: Brushless DC motor has simple structure, great power density, torque output and high efficiency. It has a broad application prospect for electric vehicle. The conventional scheme of BLDCM drive system adopts motor ontology, power drive circuits and position sensor. BLDCM is usually used with the mode of 3-phase 6-state PWM. Due to its structure and commutation strategy, it has many problems to be solved if works on electric vehicle. The basic operating principle of Brushless DC motor and the basic power drive system was discussed. In addition, investigated the torque ripple, flux-weakening speed control and brake energy regeneration for electric vehicle. Solving these problems can promote BLDCM and electric vehicle industry.
Authors: Ke Zhang, Long Xu Jin
Abstract: For large inertia servo system, improving the system response speed and control precision has always been a difficulty. This paper presents an improved auto disturbance rejection control (ADRC) strategy, which has good control performance for this kind of system. Firstly, transition process is arranged for input signal, which can solve the contradiction between overshoot and rapidity, can also increase the regulation range of feedback gain; secondly, linear extended state observer is designed to identify load changes and other fluctuations; then, for the control plant after observation compensation, a nonlinear feedback controller is designed to obtain better control performance and better disturbance rejection capability. The simulation results show that, compared with the traditional PI controller, with the control strategy suggested in this paper the system has rapid response but very little overshoot, and has strong ability to suppress interference. The design of this controller is simple, easy to implement in Engineering, so it may have important reference value for this kind of large inertia system. Keywords: servo control; large inertia; auto disturbance rejection control; torque ripple; low speed
Authors: Hong Xia Yu, Chuang Li
Abstract: One of the disadvantages of traditional direct torque control is high torque ripple, A method of reduce torque ripple was proposed basing bus-clamping and duty ratio control technique in this paper. Firstly, the switch vector table with bus-clamping technology was improved by analyzing the role of zero voltage vector to reduce torque ripple in different sector of voltage. Secondly, on the base of combing the improved bus-clamping direct torque control (BCDTC) and discrete duty ratio control (DDRC), a new switch vector table with discrete duty ratio and bus clamping was designed by analyzing the role of zero voltage vector to reduce torque ripple in different speed range. Finally, simulations are performed to verify the proposed strategies.
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