Stepping motor controller and control method thereof

Abstract

The invention discloses a stepping motor controller and a control method thereof, and relates to the technical field of stepping motor control. The stepping motor controller comprises a power supply isolating module, a communication and command processing module, a digital control module for processing a command of an upper computer and then controlling the stepping motor to operate, a signal isolating module and a power amplification module. The stepping motor controller has the benefits that a plenty of communication interfaces are provided, and control interfaces such as RS232, RS485 / CAN, I2C, SPI and PULSE are supported; the upper computer can randomly select any interface for connection control; remote multi-motor control is realized; one upper computer can be connected in series with a plurality of stepping motor controllers through an RS485 / CAN bus and carries out real-time control on any one of the stepping motor controllers. The digital control module can be used for automatically controlling the motor to perform constant acceleration / constant deceleration motion, so that a mechanical system connected with the stepping motor is smoother, and the vibration impact is reduced.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a stepper motor controller and a control method thereof. Background technique [0002] A stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. In industrial production, stepper motors are widely used in various precision motion mechanisms to complete the position control function of the system. The main problems faced by the stepper motor during operation are vibration, overheating and out of step, etc., which need to be solved by the controller using subdivision, current attenuation, closed-loop control and other technical means. For the control and drive of stepper motors, most of them currently use a single-chip microcomputer combined with a dedicated driver chip, or a DSP chip combined with a dedicated driver chip, or a FPGA combined with a dedicated driver chip. [0003] The announcement ...

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Problems solved by technology

[0003] The announcement number is 03129924.5, and the invention patent named "full digital subdivision type high-precision stepping motor controller" uses the DSP of TI Company of the United States as the main control chip, and uses a large number of ICs such as filtering and analog-to-digital conversion. The cost of the solution is too high to be widely used

In addition, the communication unit of the invention patent does not have a related configuration interface, which cannot realize industrial-grade multi-address serial control

[0004] The application number is 201010280597.1, and the invention patent named "stepping motor driver" uses a single-chip microcomputer as the main control chip, and uses the A3977 motor driver chip of the American Allegro company, which also has the defects of high cost of the solution, and there is no automatic current decay and overheat Protection, closed-loop control and other functions

[0005] The announcement number is 00253539, and the utility model patent named "Small Stepper Motor Controller" uses a single-chip microcomputer as the main control chip and has a network communication interface, but the control scheme is too simple and lacks functions such as closed-loop control, current attenuation, and overheating protection. ;The motor drive circuit is implemented by optocoupler, MOSFET, and series resistors, the drive capability is weak, and the controller does not provide a dynamic parameter configuration interface

[0006] Application No. 200920213892.8 is a utility model patent for "a stepper motor controller". FPGA is used as the main control chip, and a comparator is used to drive the stepper motor. It is not difficult to see that this solution has high cost, poor flexibility, and small driving ability Defects, and the program is controlled by buttons, without network communication interface and configuration interface, not suitable for industrial use

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