Browse Prior Art Database

Direct Bang Bang Control of 3 Phase Motors

IP.com Disclosure Number: IPCOM000094642D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Fredriksen, TR: AUTHOR

Abstract

Bang-bang reversing control of a 220-440 volt 3-phase induction motor is possible. By motor derating, either of the two sets of windings can be operated through respective sets of silicon controlled rectifiers. Two sets of diodes provide one or two return paths when a particular silicon controlled rectifier SCR is conducting.

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Direct Bang Bang Control of 3 Phase Motors

Bang-bang reversing control of a 220-440 volt 3-phase induction motor is possible. By motor derating, either of the two sets of windings can be operated through respective sets of silicon controlled rectifiers. Two sets of diodes provide one or two return paths when a particular silicon controlled rectifier SCR is conducting.

The gates of a selected set of SCR' s have a positive firing potential of approximately 3 volts applied to them. As a particular phase line becomes somewhat positive, current passes through a motor winding connected to it, associated SCR if its gate is high, a diode and associated motor winding that connects to a phase line that is negative in respect to the particular line.

A point in time is reached where a second diode and motor winding provide another return path. The set of motor windings used for contradirection is effectively disconnected at their neutral point by non-conduction of the three SCR's associated with these windings.

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