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| Precise Instantaneous Speed Detection for Permanent Magnet Synchronous Motors |
| Yang Xinghua, Jiang Jianguo |
| Shanghai Jiaotong University 200240 Shanghai China |
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Abstract This paper introduces a novel instantaneous speed detection method for permanent magnet synchronous motors (PMSMs). High detection precision is achieved by using a low resolution encoder. First, instantaneous speed and disturbance torque are estimated by a Luenberger observer based on the motion model of PMSM. Then, the estimation errors are corrected by angular position, which is obtained by synchronous sampling method (SSM) or asynchronous sampling method (ASM) according to different speed. Furthermore, in order to reduce the influence of load variation on instantaneous speed observer, load inertia is identified using the estimated values of speed and disturbance torque, and then the parameters of speed observer are adjusted according to load inertia. Compared with traditional speed observer, the method mentioned above eliminates the position detection error and delay time. So detection precision of instantaneous speed is improved largely especially in low speed region.
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Received: 23 April 2010
Published: 07 March 2014
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2011, Vol. 26 
