Special hybrid stepping motor driver for linear cutting machine tool

Abstract

The invention provides a special hybrid stepping motor driver for a linear cutting machine tool, and relates to a driver. The special hybrid stepping motor comprises a signal decoding module, a subdivision angle calculation module, a torque PID controller, an excitation PID controller, an inverse PARK conversion module, a PARK conversion module, a PWM output module, an H-bridge inverter circuit and a power-off detection module; and after the power is cut off, the power-off detection module automatically saves the current subdivision angle theta, and after the next incoming call, and the subdivision angle theta before the previous outage is sent to the subdivision angle calculation module, and the subdivision angle calculation module calculates a current subdivision angle theta according to the last subdivision angle theta and the stepping count value sent by the signal decoding module. On the basis of not changing an existing linear cutting control system, the enabling and forward andreverse rotation control of the stepping motor is realized by decoding five-phase ten-beat or three-phase six-beat signals, and meanwhile, by saving and controlling power-off of the subdivision angle, the angle of a motor shaft when the motor shaft is not deviated from the halt during power-on is achieved.

Description

technical field [0001] The invention relates to a driver, especially a stepper motor driver. Background technique [0002] At this stage, with the improvement of precision requirements for wire electric discharge machine tools, the original XYUV four-axis motion control using low-precision reactive stepper motors can no longer meet the requirements. Now manufacturers have introduced high-precision motors based on subdivision drives. For the four-axis motion control of the hybrid stepper motor, the hybrid stepper motor must have a corresponding driver, but when the existing general-purpose hybrid driver is used on the wire cutting machine tool, there are two main problems: first, the signal Interface mismatch problem. The existing mature wire cutting control system, such as the most widely used single-board computer system, HL, AutoCut and other PC-based board systems, its XYUV four-axis motion control interface is five-phase ten-shot or three-phase six-shot Stepper motor r...

AI Technical Summary

Problems solved by technology

[0002] At this stage, with the improvement of precision requirements for wire electric discharge machine tools, the original XYUV four-axis motion control using low-precision reactive stepper motors can no longer meet the requirements. Now manufacturers have introduced high-precision motors based on subdivision drives. For the four-axis motion control of the hybrid stepper motor, the hybrid stepper motor must have a corresponding driver, but when the existing general-purpose hybrid driver is used on the wire cutting machine tool, there are two main problems: first, the signal interface mismatch problem

The existing mature wire cutting control system, such as the most widely used single-board computer system, HL, AutoCut and other PC-based board systems, its XYUV four-axis motion control interface is five-phase ten-shot or three-phase six-shot Stepper motor ring distribution signal output; for three-phase six-phase, its control system outputs three signals A, B, C, through a series of sequential combinations of A-AB-B-BC-C-CA-A signals to control the step It is suitable for the original reactive stepper motor drive circuit; for the hybrid stepper motor driver, due to the different structure of the motor, a professional driver is generally required, which adopts the interface mode of the general servo driver, that is, energy, direction and Pulse 3 signals; in this way, the existing general-purpose hybrid stepper motor driver cannot be connected with the existing wire-cutting control system, and a new wire-cutting control system must be developed to achieve the connection, which has great difficulty in development, maturity and stability Need to enter the market for a long time to test and other issues

Second, the repositioning of the stepper motor every time the driver is powered on: because the hybrid stepper motor adopts subdivision drive, the single-turn stepping resolution of the motor is high, which can save the deceleration that the original reactive stepper motor has been using The gears and XYUV four-axis are directly driven by the motor and the lead screw, which simplifies the mechanical structure, but the problem is that due to the direct connection of the lead screw to the shaft, the slight vibration or deflection of the motor will cause the displacement of the lead screw, resulting in machining error

On the one hand, this solution needs to develop a new wire cutting control system. The control system is the core of the wire cutting machine tool, which includes important links such as graphic editing, trajectory tracking, and motion interpolation. The test of time, marketing is difficult

On the other hand, by installing an expensive grating scale to solve the problem of repositioning the stepper motor, there is a problem of high cost

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