Method and system for driving a stepper motor

Abstract

The invention provides a novel stepping motor driving method and system. A plus-minus counter U1, a phase-locked loop U2, a first read-only memory U3, a second read-only memory U4, multiplying units U5 and U6, summators U7 and U8, a sawtooth wave digital generator U9, comparators U10 and U11, and motor driving circuits U12 and U13 are included. By providing forward and backward high-frequency pulse current to a motor winding, heating of the motor can be controlled, and noise can be lowered; by virtue of a variable subdivision method, a low-speed shaking phenomenon can be reduced and the motor operating condition in high and low speeds can be improved; by virtue of the design of variable moment, the moment requirement of the motor in low speed and high speed can be ensured; and the novel stepping motor driving system is creative and reasonable in design, clear in structure, convenient to implement, low in cost and has important market value.

Description

technical field [0001] The invention belongs to the technical field of stepping motor control, and relates to a stepping motor driving method and system. Background technique [0002] A stepper driver is an actuator that converts electrical pulses into angular displacement. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, and its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation and positioning. [0003] Stepper motor drivers are widely used in various automation fields, and the requirements for the drive circuit of stepper motor drivers are also relatively high, but there are many problems in today's steppe...

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Problems solved by technology

[0003] Stepper motor drivers are widely used in various automation fields, and the requirements for the drive circuit of stepper motor drivers are also relatively high, but there are many problems in today's stepper motor driver circuits: 1) If the control is not done properly, resonance is likely to occur, and the operating noise is relatively large; The stepper motor can run normally at low speed, but if it is higher than a certain speed, it will not start, and it will be accompanied by howling; 2) The stepper motor generally pursues positioning accuracy and torque output, and the torque of the stepper motor will increase with the increase of the speed. 3) The efficiency is relatively low; the current is generally relatively large, and the harmonic component is high, and the frequency of the alternating current changes with the speed, so stepper motors generally have heat, and the situation is more serious than that of ordinary AC motors; 4 ) The motor vibrates when running at low speed, and it is difficult to start and stop smoothly and smoothly

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