Speed Oscillation Damping Algorithm for I-F Speed Control of Synchronous Motors

초록

Permanent Magnet Synchronous Motors (PMSMs) are widely used for high-performance control applications. However, accurate rotor position information is essential for controlling PMSMs. The rotor position is typically measured using mechanical sensors. To reduce the drawbacks related to mechanical sensors such as cost, sensorless control algorithms are widely used. However, since position estimation is difficult at low-speed or standstill conditions, the I-F speed control method is applied. Nevertheless, this method also has a drawback in that speed ripple occurs during the initial alignment and acceleration processes. In addition, I-F speed control is susceptible to speed ripple and even loss of synchronism under sudden load disturbances. To complement these limitations, this paper proposes a method that enhances the damping performance of the I-F speed control by extracting the speed oscillation components contained in the voltage command. The effectiveness of the proposed method is verified through a state space model and experimental results.

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