Diagnosis of stator and rotor faults of an induction motor in closed-loop control structure

Low-voltage and high-current direct current (DC) power supplies are essential for aerospace and shipping. However, its robustness and dynamic response need to be optimized further on some special occasions. In this paper, a novel rectification system platform is built with the low-voltage and high-current permanent magnet synchronous generator (PMSG), in which the DC voltage double closed-loop control system is constructed with the backstepping control method and the sliding mode variable structure (SMVS). In the active component control structure of this system, reasonable virtual control variables are set to obtain the overall structural control variable which satisfied the stability requirements of Lyapunov stability theory. Thus, the fast-tracking and the global adjustment of the system are realized and the robustness is improved. Since the reactive component control structure is simple and no subsystem has to be constructed, the SMVS is used to stabilize the system power factor. By building a simulation model and experimental platform of the 5 V/300 A rectification module based on the PMSG, it is verified that the power factor of the system can reach about 98.5%. When the load mutation occurs, the DC output achieves stability again within 0.02 s, and the system fluctuation rate does not exceed 2%.

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Study of Direct Torque Control Scheme for Induction Motor Based on Torque Angle Closed-Loop Control

The Open Electrical & Electronic Engineering Journal ◽

10.2174/1874129001509010600 ◽

2015 ◽

Vol 9 (1) ◽

pp. 600-609

Author(s):

Xuande Ji ◽

Daqing He ◽

Yunwang Ge

Keyword(s):

Induction Motor ◽

Closed Loop ◽

Direct Torque Control ◽

Torque Ripple ◽

Torque Control ◽

Closed Loop Control ◽

Current Waveform ◽

Loop Control ◽

Waveform Distortion ◽

Torque Angle

For disadvantages of the large flux and torque ripple and current waveform distortion of Direct Torque Control (BASIC-DTC), the DTC scheme for induction motor based on torque angle closed-loop control was presented and the proposed scheme was realized with three methods of torque angle closed-loop control. The main characteristics of three methods of torque angle closed-loop control for the proposed scheme was analyzed, emphasizing their advantages and disadvantages. The performance of three methods of torque angle closed-loop control for the proposed scheme was studied in terms of flux and torque ripple, current waveform distortion and transient responses. Simulation results showed that the proposed scheme improves the performance of induction motor BASIC-DTC by combining low flux ripple, low torque ripple and low current waveform distortion’s characteristics with fast dynamics.

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A High-Frequency Inverter Based on Double Closed-Loop Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.241-244.509 ◽

2012 ◽

Vol 241-244 ◽

pp. 509-512

Author(s):

Lin Yang ◽

Gen Wang Liu

Keyword(s):

High Frequency ◽

Closed Loop ◽

Control Structure ◽

Dynamic Performance ◽

Current Loop ◽

Closed Loop Control ◽

Voltage Waveform ◽

Loop Control ◽

Static Performance ◽

Frequency Inverter

In order to improve the dynamic performance of inverter and the output voltage waveform quality, the double-loop control combination with internal current loop and external voltage loop is introduced. The inner loop is used for improving the dynamic performance of the system and rapidly eliminating the effects of load disturbance; the outer loop is used for improving static performance of the system. In the end, MATLAB / Simulink is carried out to build the system model and prove the feasibility of the dual closed-loop control structure in this paper.

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Real-Time Low-Cost Speed Monitoring and Control of Three-Phase Induction Motor via a Voltage/Frequency Control Approach

Mathematical Problems in Engineering ◽

10.1155/2020/6913813 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Ali Hmidet ◽

Olfa Boubaker

Keyword(s):

Real Time ◽

Induction Motor ◽

Closed Loop ◽

Low Cost ◽

Closed Loop Control ◽

Loop Control ◽

Control Approach ◽

Three Phase ◽

Wide Range ◽

Voltage Frequency

In this paper, a new design of a real-time low-cost speed monitoring and closed-loop control of the three-phase induction motor (IM) is proposed. The proposed solution is based on a voltage/frequency (V/F) control approach and a PI antiwindup regulator. It uses the Waijung Blockset which considerably alleviates the heaviness and the difficulty of the microcontroller’s programming task incessantly crucial for the implementation and the management of such complex applications. Indeed, it automatically generates C codes for many types of microcontrollers like the STM32F4 family, also used in this application. Furthermore, it offers a cost-effective design reducing the system components and increasing its efficiency. To prove the efficiency of the suggested design, not only simulation results are carried out for a wide range of variations in load and reference speed but also experimental assessment. The real-time closed-loop control performances are proved using the aMG SQLite Data Server via the UART port board, whereas Waijung WebPage Designer (W2D) is used for the web monitoring task. Experimental results prove the accuracy and robustness of the proposed solution.

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