Fixed-frequency integral controller of brushless direct-current motor and construction method thereof

Abstract

The invention discloses a fixed-frequency integral controller of a brushless direct-current motor and a construction method thereof. The fixed-frequency integral controller comprises a speed setting unit, a closed-loop controller, a fixed-frequency integral control unit, a brushless direct-current motor speed adjusting system and a speed measuring unit. The construction method comprises the following steps of: (1) constructing the brushless direct-current motor speed adjusting system; (2) carrying out equivalence on the brushless direct-current motor speed adjusting system; (3) constructing the fixed-frequency integral control unit; (4) constructing the closed-loop controller; (5) connecting the fixed-frequency integral control unit and the closed-loop controller in series; (6) adding a speed setting signal ng to the closed-loop controller; (7) adding an actual speed n to the closed-loop controller; (8) processing the ng and n acquired by the closed-loop controller and adding the processed ng and n to an output end of a comparator; (9) obtaining a control signal with the duty ratio being D by the fixed-frequency integral control unit; and (10) controlling the rotating speed of thebrushless direct-current motor by the brushless direct-current motor speed adjusting system. The controller and the construction method thereof have the advantages of reasonable design, good speed traceability, strong load-disturbance resistance and wide application prospect.

Description

Technical field [0001] The invention relates to the technical field of speed regulation of a brushless DC motor, in particular to a constant frequency integral controller of a brushless DC motor and a construction method thereof. Background technique [0002] Brushless DC motors have become the preferred solution for transmission actuators in many fields due to their small size, light weight, no commutation sparks, high efficiency, large output, good characteristics, and fast response. Brushless DC motors usually use speed current double closed loop linear PID control. The linear PID control algorithm is simple and easy to implement, but the dynamic response becomes worse under the conditions of motor parameter changes and load disturbance, and the robustness is not strong, which cannot meet the control requirements of higher-precision dynamic performance applications. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a br...

AI Technical Summary

Problems solved by technology

The linear PID control algorithm is simple and easy to implement, but the dynamic response becomes poor under the conditions of motor parameter changes and load disturbances, and the robustness is not strong, so it cannot meet the control requirements of higher precision dynamic performance applications

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