Practical Issues of Sensorless Control for PMSM Drives
The MTPA control is a simple and practical method to achieve high-efficiency operation of IPMSM. Recently, many MTPA control methods have been investigated to guarantee the minimum copper loss of IPMSM [1–6]. In most commercial drives, the MTPA control is achieved with the lookup tables or the polynomial fitting. The conventional MTPA control method is parameter dependent, and the effectiveness relies on the knowledge of the accurate motor parameters. The online parameter identification or offline parameter testing is necessary to achieve the robust MTPA operation [4–6]. Recently, the test signals injection method has been proposed, which can allow the MTPA trajectory to be learned online; however the signal injection method looks somewhat complex [1–3]. In most literatures, the online MTPA control methods used in IPMSM drive system should be installed with a position sensor for the control. Some key issues including the current ripple and torque transient should be carefully considered for the sensorless IPMSM drive.
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