Dual-mode control method and system for stepping motor

A technology of stepping motor and control method, applied in control system, motor generator control, electronic commutation motor control and other directions, can solve the problem that the rotation speed cannot be very high, and achieve the effect of simple structure, stable operation and high working accuracy

Inactive Publication Date: 2005-03-16
深圳市东方宇之光科技股份有限公司
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Problems solved by technology

However, when dragging a large inertia load to rotate, due to the...

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  • Dual-mode control method and system for stepping motor
  • Dual-mode control method and system for stepping motor
  • Dual-mode control method and system for stepping motor

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Embodiment Construction

[0043] The present invention aims to solve the method and system for the high-speed out-of-step problem of stepper motors when controlling large inertia loads, including two working modes and operation and control systems: one is traditional open-loop stepping, and the other is DC brushless closed-loop speed Servo is used in position control and speed control states respectively.

[0044] The typical structure of the system is shown in Figure 1, in which the stepper motor 1, the load (roller) 4, and the grating encoder 5 are directly connected by an elastic coupling; in addition, it also includes control systems such as a controller 6, a driver 7, and a control computer 8 .

[0045] A stepper motor driver can be a full-step, half-step driver, or a subdivision driver. If the stepper motor is a two-phase motor with an angular distance of 1.8°, and the driver is an 8-subdivision type, the number of pulses required to drive the drum to rotate one revolution can be calculated as ...

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Abstract

The invention is a step motor double-mode control method and system, and the method includes a open-loop step mode that a mode switcher directly feeds a step pulse signal from a computer to a driver and a DC brushless closed-loop speed servo mode that the mode switcher receives a grating signal as a step pulse to feed the grating signal to the driver and simultaneously the grating signal also acts as a speed feedback signal to compare with a given speed signal, their difference value drives a voltage servo regulator to give a proper control voltage and it maintains a constant starting difference value between the driving pulse sent from the step driver and the obtained driving pulse. And the system includes a load driven by step motor, a grating sensor connected with the other end of the load, a controller connected with the grating sensor, a control computer connected with the controller and a step driver that drives the step motor.

Description

technical field [0001] The invention relates to a drum type laser phototypesetting machine, mainly referring to a stepping motor dual-mode control method and system. Background technique [0002] In some engineering applications, such as drum-type phototypesetters and laser photoplotters, it is required to achieve both high-speed rotation of the load (drum) and frequent and precise angular positioning, and such loads often have a large moment of inertia. [0003] The traditional solution is generally to use a hysteresis synchronous motor to drive the roller to achieve high-speed operation, and at the same time supplement it with a stepping motor, friction wheel, clutch, cam and other mechanisms to achieve angular positioning. This type of mechanical structure is relatively complicated. [0004] Another possible solution is an AC servo. The AC servo system can take into account both positioning and high-speed dragging. However, in order to meet the requirements of stabilit...

Claims

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Application Information

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IPC IPC(8): H02P6/06H02P8/14H02P8/38
Inventor 刘晓东
Owner 深圳市东方宇之光科技股份有限公司
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