2 results about "Commutation torque ripple" patented technology

The application discloses a current control method for inhibiting commutation torque fluctuation of a brushless direct current motor, and first connects a DC-DC voltage boosting circuit, a three-phase inverter circuit and the brushless direct current motor to build a complete motor control system; torque control is realized by obtaining non-commutation current and estimated position, calculating a commutation state and a current instruction, and outputting a reference voltage by using a current controller; control parameters of a non-commutation process are adjusted according to torque tracking performance, and the control parameters of the commutation process are determined in combination with voltage boosting capacity of the voltage boosting circuit and waveform characteristics during commutation; the start and end time of the commutation process is calculated, a transition process during switching of different control parameters is set, and online adaptive adjustment of the control parameters is simultaneously performed. The method can realize accurate torque tracking of the brushless direct current motor system containing the DC-DC voltage boosting circuit in a full speed range, so that good dynamic and steady state control performance is obtained.

The invention provides a brushless direct current motor commutation torque ripple compensation device, and relates to the technical field of brushless direct current motors, the brushless direct current motor commutation torque ripple compensation device comprises a shell, and further comprises a dynamic flux linkage compensation assembly, the dynamic flux linkage compensation assembly comprises a rotor arranged in the shell, and a bearing is arranged on the rotor. The torque sensor monitors torque changes in the motor commutation process in real time and transmits torque pulsation signals to the compensation current control module, the compensation current control module analyzes the signals and then generates adaptive compensation current instructions, current clutters are filtered out through the filter, stable compensation current is output to restrain basic torque pulsation, and the compensation current control module controls the compensation current control module to control the motor commutation. The rotary knob is rotated to drive the screw to rotate, the second connecting block in threaded connection pushes the rack to slide along the limiting grooves of the first supporting frame and the second supporting frame, the rack drives the permanent magnets to move, the positions of the permanent magnets are adjusted through the rotary shaft and the universal joint, dynamic flux linkage compensation is achieved, and commutation torque pulsation is further weakened.