Method for dynamically controlling torque of direct-current brushless motor

Abstract

The invention provides a method for dynamically controlling the torque of a direct-current brushless motor, which comprises the steps that a single-chip microcomputer inputs initial control voltage bto a motor driver to enable the motor to remain at an initial position c; the single-chip microcomputer controls the current input into the motor driver to be sine wave signals with a phase differenceof 120 degrees, and the motor rotates; the control voltage input into the motor driver by the single-chip microcomputer is b+a, the force F in the current motor rotating direction is in sine relationwith the angle difference a between the voltage b corresponding to the motor initial position c and the currently input control voltage b+a, and the torque is M at the moment; after the motor rotatesby any angle j, a feedback device feeds back the position b+j of the motor to the single-chip microcomputer; the single-chip microcomputer receives a feedback signal of the feedback device and then inputs a control voltage b+j+a to the motor driver, the force F in the rotating direction of the motor is kept to be sin(a), and the torque is kept to be M. The invention has the beneficial effects that the output voltage of the single-chip microcomputer is adjusted in real time through the cooperation of the single-chip microcomputer and the feedback device, so that the torque of the direct-current brushless motor is controlled more simply.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for dynamic torque control of a DC brushless motor. Background technique [0002] Brushless DC motors are used in a wide range of applications, such as automobiles, tools, industrial control, automation, and aerospace. In general, brushless DC motors can be divided into three types. The main uses include: (1) Continuous load applications, mainly in areas that require a certain speed but do not require high speed accuracy, such as fans, water pumps, hair dryers, etc. The application of this kind of application is lower in cost and mostly open-loop control. (2) Variable load applications, mainly applications where the speed needs to change within a certain range, have higher requirements for the motor speed characteristics and dynamic response time characteristics. For example, dryers and compressors in household appliances are good examples. Oil pump control, elec...

AI Technical Summary

Problems solved by technology

The DC brushless motor adopting the FOC control method can provide large torque and ensure the speed, but the FOC control algorithm software is relatively complicated, and needs to be controlled by a series of transformations such as feedback and current through Parker, etc., with many logics and complicated processes.

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