Browse Prior Art Database

Dual Frequency Shaded Pole Motor Using Tapped Windings

IP.com Disclosure Number: IPCOM000083850D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

McMaster, RE: AUTHOR

Abstract

The common motor for a 50 Hz/60 Hz input with equivalent performance is achieved, by tapping the field windings of a 50 Hz motor at a point which produces equivalent impedance on 60 Hz, thereby producing an equal field strength and equivalent performance.

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Dual Frequency Shaded Pole Motor Using Tapped Windings

The common motor for a 50 Hz/60 Hz input with equivalent performance is achieved, by tapping the field windings of a 50 Hz motor at a point which produces equivalent impedance on 60 Hz, thereby producing an equal field strength and equivalent performance.

As illustrated in the figure by tapping the field windings 1 of a shaded-pole motor, a second set of leads may be brought out of the motor shell and the motor may be then used on either 50 or 60 Hz by using the appropriate input leads.

The motor is tapped to provide a constant input impedance on 50 and 60 Hz while maintaining the same level of flux concentration, thereby producing equivalent performance. This may be used only on motors with salient poles
(i.e., shaded pole and reluctant start).

If the winding is distributed as in permanent-split capacitor (PSC) or split- phase motors, the performance on 60 Hz would be reduced because of harmonic generation caused by nonsinusoidal flux density across the pole face.

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