Sensorless micro-permanent magnet synchronous motor control system with a wide adjustable speed range

Author(s): T.-Y. Chou ; T.-H. Liu ; T.-T. Cheng
DOI: 10.1049/iet-epa.2011.0108

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Author(s): T.-Y. Chou ¹ ; T.-H. Liu ¹ ; T.-T. Cheng ¹
- Affiliations: 1: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taiwan
Source: Volume 6, Issue 2, February 2012, p. 62 – 72
DOI: 10.1049/iet-epa.2011.0108 , Print ISSN 1751-8660, Online ISSN 1751-8679

This study proposes a new sensorless speed control system for a micro-permanent magnet synchronous motor. Owing to the special characteristics of the micro-permanent magnet synchronous motor, a new rotor position estimator is proposed here. First, by detecting the three-phase zero-current crossing points, a low-resolution of the current position can be detected. Next, by using a Proportional Integral (PI) state estimator, the resolution of the current position can be obviously improved. After that, the deviation voltage between the ideal d-axis voltage and the estimated d-axis voltage is computed to compensate the estimated rotor position. By using the estimated rotor position, the proposed sensorless closed-loop control system, which has good performance including fast transient responses, good load disturbance responses and good tracking responses, can be realised. A digital signal processor, TMS320F28335, is used as a control centre to execute the rotor position estimating algorithm and control algorithm. Experimental results show that the sensorless micro-permanent magnet synchronous motor control system can provide a wide adjustable speed range from 5 to 40 000 r/min with satisfactory performance, which is better than the micro-permanent magnet synchronous motor using an attached 64 pulses/revolution encoder.

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Sensorless micro-permanent magnet synchronous motor control system with a wide adjustable speed range

Sensorless micro-permanent magnet synchronous motor control system with a wide adjustable speed range

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