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Improving Open Loop High Stepping Rate Stepping Motor Performance

IP.com Disclosure Number: IPCOM000077639D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Hendrickson, KE: AUTHOR [+3]

Abstract

A bifilar wound stepper motor having four Windings is normally driven using the following sequence of energized windings: 1 & 4, 1 & 3, 2 & 3, 2 & 4, 1 & 4, etc. To obtain smoother operation, higher torques at the same speeds, and higher maximum stepping rates a sequence of half steps is used energizing the windings as follows: 1 & 4, 1, 1 & 3, 3, 2 & 3, 2, 2 & 4, etc. This half-step sequence is illustrated in the timing chart of Fig. 1. Two such half steps equal one whole step.

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Improving Open Loop High Stepping Rate Stepping Motor Performance

A bifilar wound stepper motor having four Windings is normally driven using the following sequence of energized windings: 1 & 4, 1 & 3, 2 & 3, 2 & 4, 1 & 4, etc. To obtain smoother operation, higher torques at the same speeds, and higher maximum stepping rates a sequence of half steps is used energizing the windings as follows: 1 & 4, 1, 1 & 3, 3, 2 & 3, 2, 2 & 4, etc. This half-step sequence is illustrated in the timing chart of Fig. 1. Two such half steps equal one whole step.

Rapid turn-off of the winding current is necessary to achieve high-stepping rates. Such rapid turn-off may be effected, as shown in Fig. 2, using a zener clamp 5 when controlling current in windings 6 and 7.

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