| Synchronous motor drive system based on power electronics technique has beenwidely used in the fields of high voltage and power for its high efficiency, wide speedregulating range and high precision, high stability, fast dynamic response, etc.Existing control systems require a large number of electrical sensors, which affectsthe system reliability because of complex system hardware and high failure rate. Inaddition, the change of motor parameters will also affect system performance. Theapplication of sensorless control and online parameter identification technology is aneffective way to improve reliability and efficiency of the drive system. This paperconsiders the control system of the electrically excited synchronous motor as theresearch object and presents in-depth studies of key technologies such as synchronousmotor sensorless control, online parameter identification, and so on.Based on the basic electromagnetic relations of electrically excited synchronousmotor, this paper proposed a method getting the temperature and resistance of thewinding by online identification based on self-sensing, and two methods detectingrotor position and speed by injecting high-frequency signals into stator and injectinghigh-frequency signals into rotor respectively. The simulate and experimental resultsanalyze and validate the mentioned methods which proved to be good.
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