Browse Prior Art Database

Stepping Motor Control

IP.com Disclosure Number: IPCOM000093918D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Heard, RS: AUTHOR

Abstract

The drawing represents the center tapped stator windings of an AC stepping motor. This motor is normally controlled in DC applications by applying direct currents from point 10 through the coils to terminals 11...14.

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Stepping Motor Control

The drawing represents the center tapped stator windings of an AC stepping motor. This motor is normally controlled in DC applications by applying direct currents from point 10 through the coils to terminals 11...14.

The coils are located 90 electrical degrees apart and equal currents are passed through orthogonal coils. The resultant flux vector lies at 45, 135, 225 or 315 degrees. The rotor can be stepped neither rotational direction by changing the two direct currents in the coils to rotate the flux vector by 90 electrical degrees.

A more efficient method of control requiring half the current for the same holding force is obtained by using a single direct current from point 10 to any of terminals 11... 14. These single currents in the coils define flux vectors at 0, 90, 180 and 270 degrees. The rotor can be stepped in either direction by controlling the currents in the coils. Since the teeth of the rotor are already aligned with a pole when the current is removed, there is no motion of the rotor as there is under similar conditions when a two-current control is employed.

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