Device and method for controlling stepping motor

Abstract

The invention belongs to the field of electric control and particularly relates to a device and method for controlling a stepping motor. The device for controlling the stepping motor is composed of a computer, a single-chip microcomputer, a control signal optoelectronic isolation circuit, a linear non-stabilized-voltage supply, an output current control circuit, a driving circuit, a winding current acquisition circuit, a reference voltage comparison circuit and a feedback signal optoelectronic isolation circuit, wherein the computer is in communication with the single-chip microcomputer so that remote setting of parameters of the stepping motor can be achieved, the single-chip microcomputer controls the high-precision rotation, achieved through the stepping motor driving circuit, of the stepping motor according to the set parameters, current signals fed back by the winding current acquisition circuit and the number of actual walking pulses are acquired at the same time, and thus high-precision control over the high-power stepping motor is achieved.

Description

technical field [0001] The invention belongs to the field of electromechanical control, and in particular relates to a control device and method for a stepping motor. Background technique [0002] Due to the characteristics of low speed, high torque, and non-accumulation of errors, stepper motors are widely used in precision testing equipment such as high-precision translation platforms and high-precision electric turntables. [0003] At present, most of the control methods of stepper motors adopt the open-loop control method with a single function. Its disadvantages are as follows: [0004] 1) The accuracy and stability of the driving pulse frequency are not high enough, which causes the inconsistency of the energization cycle of each phase winding, resulting in low control accuracy; [0005] 2) The drive pulse frequency cannot be changed arbitrarily according to the load demand and motor speed requirements, resulting in resonance between the natural frequency of the syst...

AI Technical Summary

Problems solved by technology

[0004]1) The accuracy and stability of the driving pulse frequency are not high enough, which causes the inconsistency of the energization cycle of each phase winding, resulting in low control accuracy;

[0005]2) The drive pulse frequency cannot be changed arbitrarily according to the load demand and motor speed requirements, resulting in resonance between the natural frequency of the system and the drive frequency, resulting in chatter and howling;

[0006]3) Traditional subdivision control is usually realized by manually adjusting the subdivision dial switch of the driver, and real-time program-controlled modification cannot be performed as required;

[0007]4) Since the driving current of the traditional control device is small and cannot be modified by program control after setting, it is difficult to directly drive the high-power motor. Most of the methods used at this stage are The torque is increased by sacrificing the rotational speed through screw or worm gear transmission methods to achieve large load driving capacity, but this method will introduce meshing errors and space backlash between the teeth of the mechanical structural parts, which will reduce the motion accuracy. In order to solve the motion accuracy Most designers use an encoder as a feedback method, but this undoubtedly increases the design cost and control difficulty;

[0008]5) Most drivers have half-current self-locking and full-current self-locking functions, that is, half of the current value or the full current passing through the winding when the motor is at rest The value makes the motor lock and does not rotate, but when the user needs to manually rotate the motor, the control circuit needs to be powered off, which is inconvenient to operate

[0009]Because of the above technical problems, the stepper motor has certain limitations in the application field of precision testing equipment, and it is difficult to guarantee the driving ability and Motion accuracy, in terms of system integration of test equipment, it is also difficult to realize the modification of the user's own actual demand parameters through software program control, which is not convenient for automatic control under system integration

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