Soft control method of motor

Abstract

The invention discloses a soft control method of a motor. In the starting stage of the motor, a controller reads a preset output current value F and the linear change rate K of a preset output current, wherein the preset output current value F corresponds to preset torque needing to be achieved when the motor is started, the output current of the controller changes in a curve mode, and specifically, a curved instant tangent slope K1, namely an actual instant change rate of the output current of the controller at the current moment, changes from 0 to K, K is larger than 0; when K1 reaches K, the output current of the controller changes continuously according to a straight line with the slope being K; when reaching F, the value of the output current is kept by the controller, and the starting stage is finished. The soft control method of the motor aims to overcome the defect that in the prior art, gaps are formed among gears in the starting stage of the motor and then impact and collision are produced, and can effectively avoid impact and collision among the gears.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a control method capable of softening and growing the motor at the start-up stage. Background technique: [0002] The starting process of electric forklifts, hybrid vehicles, pure electric vehicles and other vehicles usually requires the participation of the motor drive system. The motor drive needs to be connected to the gear through the motor shaft, and the torque is transmitted to other system components through the gear. However, due to manufacturing and equipment errors in gear transmission, there is a certain gap in the gear, which changes the contact state of the tooth surface, resulting in a certain impact in the process of contact, disengagement, and re-contact of the gear. In the traditional motor drive technology, the impact of the gear gap at the start is extremely obvious, which easily causes the transmission system to vibrate and generate noise. At present,...

AI Technical Summary

Problems solved by technology

However, due to manufacturing and equipment errors in gear transmission, there is a certain gap in the gear, which changes the contact state of the tooth surface, resulting in a certain impact in the process of contact, disengagement, and re-contact of the gear.

In the traditional motor drive technology, the impact of the gear clearance at the start is abnormally obvious, which easily causes the transmission system to vibrate and generate noise

At present, there is already a relatively mature mechanical technology to eliminate gear backlash, but it will inevitably increase the cost and processing difficulty

Images