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Stepper motor for keeping position of printing plate exposure device

A technology of stepper motor and exposure device, which is applied in the direction of motor generator control, electrical components, control system, etc., can solve the problems of not being able to rotate beyond the limit and the existence of rotation angle restrictions.

Inactive Publication Date: 2010-12-22
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the stepper motor has a stop beyond which the stepper motor cannot be rotated, so that there is a rotation angle limitation

Method used

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  • Stepper motor for keeping position of printing plate exposure device
  • Stepper motor for keeping position of printing plate exposure device
  • Stepper motor for keeping position of printing plate exposure device

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Experimental program
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Embodiment Construction

[0022] exist figure 1 A printing plate exposure device 1 is shown schematically in FIG. 1 , wherein a printing plate 3 is drawn by means of a laser writing device, not shown. For each printing job, a printing forme 3 must be drawn for each color separation in the offset printing press. This leads to the fact that in larger printing plants a large number of printing plates 3 must be drawn in the shortest possible time. For the reasons mentioned, modern printing plate exposure devices 1 are designed for the highest possible output of printing plates per hour. During the writing process, the printing plate 3 is passed step by step, ie line by line, by a stationary laser writing head, not shown, and drawn on. For this reason, the plate cylinder 2 must be positioned precisely by means of a stepper motor M. The stepping motor M is controlled by a motor control device 4 which controls the rotating magnetic field of the stepping motor M in such a way that a desired number of steps ...

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PUM

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Abstract

The invention relates to the controlling method of a stepper motor (M) for keeping position of a printing plate exposure device. The stepper motor maintains at the position where the motor occupies at last after current is cut off. The stepper motor (M) comprises a stator (5) and a rotor (6). The invention is characterized in that before the current is cut off, the rotor (6) of the stepper motor (M) is positioned at the rotary magnetic field of the stator (5).

Description

technical field [0001] The invention relates to a method for controlling a stepper motor which retains its last position after the current has been switched off, wherein the stepper motor has a stator and a rotor, the stator being used for to generate a rotating magnetic field. Background technique [0002] For high-quality applications of drives in which high-resolution and / or exact positioning or defined, precise synchronous operation are important, instead of a servo consisting of an electric motor and an angle sensor with an adjusting final stage for cost reasons Motor and choose a more favorable stepper motor. Depending on the quality, these are 2-phase motors, 3-phase motors or 5-phase motors here. What makes many stepper motors special is their mechanical construction. The rotor comprises a permanent magnet in the direction of the motor shaft, the poles of which are mechanically separated. Here, a pole number of 50 has proven suitable and is often used. The stato...

Claims

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Application Information

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IPC IPC(8): H02P8/00
CPCH02P8/30
Inventor V·豪森赫恩P·梅尔策H·奥托
Owner HEIDELBERGER DRUCKMASCHINEN AG
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