Spacecraft motor strong temperature drift environment-oriented adaptive control method without position sensor

Abstract

The application discloses a position sensorless adaptive control method for a strong temperature drift environment of a spaceflight motor. The method comprises the following steps: collecting three-phase currents of the motor and converting the three-phase currents into d-axis currents and q-axis currents; injecting a high-frequency voltage signal into a stator winding of the motor through an inverter, and filtering and extracting a high-frequency current component; identifying motor parameters based on an equivalent voltage model under high-frequency excitation, and dynamically updating the motor parameters based on the identified motor parameters; constructing a sliding mode observer, estimating motor states, obtaining a current error, substituting the estimated current into a motor voltage equation, obtaining a back electromotive force, and calculating a rotor position angle according to the back electromotive force; obtaining a low-speed position estimation value; constructing a weight function, fusing the estimated position obtained by the sliding mode observer, inputting the estimated position into a vector controller, and generating a PWM signal to control the inverter to drive the motor. Without increasing the hardware cost, the robustness, control accuracy and operation stability of the system in the strong temperature drift environment are significantly improved.

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