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Cross Coupled Motor Control Circuits

IP.com Disclosure Number: IPCOM000086619D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Iwata, PG: AUTHOR

Abstract

In some machines, a large movable mass on a machine bed is moved under the influence of a motor M having a forward winding MF and a reversing winding MR. When automatic controls operate MR and MF, suitable precautions can be taken such that simultaneous actuation of the winding does not occur and that the windings are not overloaded by quickly reversing a directional motion of a large mass. In certain situations, the machine may be controlled manually via motor reverse control wherein the operator moves a reversing lever for moving the large movable mass in one of two directions. When the reversing lever is actuated, the inactive motor can be immediately actuated, resulting in a large electrical load.

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Cross Coupled Motor Control Circuits

In some machines, a large movable mass on a machine bed is moved under the influence of a motor M having a forward winding MF and a reversing winding MR. When automatic controls operate MR and MF, suitable precautions can be taken such that simultaneous actuation of the winding does not occur and that the windings are not overloaded by quickly reversing a directional motion of a large mass.

In certain situations, the machine may be controlled manually via motor reverse control wherein the operator moves a reversing lever for moving the large movable mass in one of two directions. When the reversing lever is actuated, the inactive motor can be immediately actuated, resulting in a large electrical load.

In attempting to reverse the directional motion of the mass, to avoid overloading the motor, a cross-coupled time delay circuit AB prevents actuation of the newly actuated motor until the large movable mass has reduced speed. When motor MR is moving the mass in the first direction, time delay relay B, being in parallel to MR, is energized. This means that the normally closed power contacts B1 are opened. The operator actuates the reversing lever, removing power from MR and supplying power to line 10. The newly applied power on line 10 cannot reach winding MF until normally closed contacts B1 close. Time delay relay B maintains contact B1 open until the appropriate time has been reached, wherein winding MF cannot be damaged by the...