Abstract
This paper presents a novel position and speed estimation method for low-speed sensorless control of interior permanent-magnet synchronous machines (IPMSMs). The parameter design of the position and speed estimator is based on the sampled current rather than the motor electrical parameters. The proposed method not only simplifies the parameter design, it enables the estimator to work normally even in the condition that the electrical parameters are uncertain or varied. The adaptive filters are adopted to extract the desired high frequency current. The structure and corresponding transfer function are analyzed. To address the shortage of insufficient stop-band attenuation, the structure of the adaptive filter is modified to provide suitable bandwidth and stop-band attenuation simultaneously. The effectiveness of the proposed sensorless control strategy has been verified by simulations and experiments.
Highlights
Interior permanent-magnet synchronous machines (IPMSMs) are widely employed in high-performance applications due to their high power density and efficiency
This paper presents a Phase Locked Loop (PLL)-type speed and position estimator whose parameter selection is based on the extracted high frequency current rather that the electrical parameters
The test IPMSM is fed by a voltage-source inverter using a
Summary
Interior permanent-magnet synchronous machines (IPMSMs) are widely employed in high-performance applications due to their high power density and efficiency. Two kinds of carrier signals, revolving high frequency carrier signal and pulsating high frequency carrier signal, are usually used to estimate the rotor speed and position [15,16,17]; though the form of injected voltage vector differs: the former injects the revolving voltage vector with a higher frequency than the fundamental voltage vector at the two-phase stationary coordinate; the latter injects the pulsating high frequency voltage vector in a specific direction at the two-phase rotating coordinate They both generate corresponding high frequency carrier current and extract the desired information from it. Unlike the common demodulation scheme that uses the voltage as the reference signal when extracting the position-related information, the high frequency current itself is used to estimate the rotor speed and position. The simulation and experiment results verify the effectiveness of the proposed sensorless control scheme
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