A device and method for suppressing low-speed torque ripple of a brushless DC motor

Abstract

The invention discloses a low-speed torque pulsation restraining device and restraining method for a brush-less direct current motor. The low-speed torque pulsation restraining device for the brush-less direct current motor comprises a voltage type inverter, a controller and a current gathering module, wherein the output end of the voltage type inverter is correspondingly connected with the three-phase winding of the brush-less direct current motor, and the input end of the current gathering module is connected with the three-phase winding of the brush-less direct current motor for gathering the current which flows through the three-phase winding and sending the gathered current to the controller; the input end of the controller is further connected with the Hall signal output end of the brush-less direct current motor, the output end of the controller is connected with the voltage type inverter, and the controller realizes to control the conduction of each phase of the brush-less direct current motor through controlling the voltage type inverter. The low-speed torque pulsation restraining device for the brush-less direct current motor is capable of inhibiting the torque pulsation through maintaining the current.

Description

technical field [0001] The invention belongs to the field of electronic control, in particular to a device and method for suppressing low-speed torque ripple of a brushless DC motor based on maintaining constant current. Background technique [0002] Brushless DC motor has the advantages of small size, good performance, simple structure, high reliability, and large output torque. The scope of application of this type of motor. Taking the brushless DC motor two-two conduction and three-phase six-state as an example, when the low-speed brushless DC motor commutates, the current without phase change will change, which will cause torque ripple. It is because the current of the conduction phase changes too fast, so slowing down the change of the current of the conduction phase and making the current of the non-phase change tend to be constant can play a role in suppressing the torque ripple. This case is based on this line of thought. Contents of the invention [0003] The o...

AI Technical Summary

Problems solved by technology

[0002] Brushless DC motor has the advantages of small size, good performance, simple structure, high reliability, and large output torque. The scope of application of this type of motor

Images