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Synchronous Motor Synchronizer

IP.com Disclosure Number: IPCOM000093478D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Woodard, OC: AUTHOR

Abstract

This apparatus utilizes the inherent property of synchronous motors to operate at discrete rotation phase angles to synchronize two or more synchronous motors.

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Synchronous Motor Synchronizer

This apparatus utilizes the inherent property of synchronous motors to operate at discrete rotation phase angles to synchronize two or more synchronous motors.

Motor M2 is to be synchronized with motor M1. Each motor shaft includes a mirror 20 which cooperates with a light source 22 and a photodiode 24. A mirror 20 directs a beam of light so that it strikes a photodiode 24 which provides output current pulses indicative of the motor speed and rotational phase angle.

Pulse D1, indicative of the rotational phase angle of motor M1, is applied to delay line 26 whose output is applied to gate generator 28. The output of generator 28 is applied to Inverter I and is provided as a first input to And 32.

Pulse D2, initiated by the other photodiode 24, is provided as a second input to And 32. A third input is provided to And 32 from the output of single-shot 36 and Inverter 38.

If the D2 pulse falls outside the gate, a single-shot fires for a preselected period which opens relay 42 and turns off M2 for a period of time T1 equal to that of the single-shot. During this time, M2 is allowed to slow down enough so that when M2 relay 42 closes it has slipped in phase by one pole position. When single-shot 40 fires, single-shot 36 is also operated and is adapted to have a longer period than single-shot 40. The reason single-shot 36 degates And 32 is to allow M2 to stabilize in the new pole position before repeating the process. M2 is turned off and...