Method and apparatus for controlling multiple motor drive of pri

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Having electrical synchronizing interconnections

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318 68, 318 85, 318 90, 318112, 399 18, 271256, H02P 154

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active

057571473

ABSTRACT:
A method and apparatus for controlling a multiple motor drive arranged to drive printing cylinders of a printing machine sychronously decelerates each of the drives upon a failure or defect occurring in one or more of the components of the drive system such that the individual printing cylinders are decelerated in a manner synchronized with one another with respect to rotation angle. The apparatus includes a main control device which detects a failure in one of the drive system components and controls the drive units to decelerate the drive units to a standstill in accordance with a time function. The time function is determined by the rotation of the drive unit which contains the component that failed. The apparatus ensures in an electrical and single-fault manner that the failure of a component in one of the drive units does not lead to rotation of the cylinders or axles beyond a predetermined amount which would cause damage to the grippers or the cylinders by the grippers contacting the cylinder surface of an adjacent cylinder.

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patent: 5678138 (1997-10-01), Kobayashi et al.

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