Browse Prior Art Database

Stepper Motor Device

IP.com Disclosure Number: IPCOM000074361D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Cupp, JC: AUTHOR

Abstract

This driving circuit is used to control the stepping of a two-coil, three-input stepping motor incorporating a feature for preventing burnout of drive transistors T1 and T2.

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Stepper Motor Device

This driving circuit is used to control the stepping of a two-coil, three-input stepping motor incorporating a feature for preventing burnout of drive transistors T1 and T2.

Stepping motor M is stepped alternately by transistors T1 and T2, respectively. Transistors T3 and T4 are used to control the turnon and turnoff of transistors T1 and T2. Diodes D1 and D2 are placed in series with transistor T4 such that the operating characteristics of transistor T4 with respect to transistor T3 are such that T3 will be completely turned off before transistor T4 is turned on and that transistor T4 will be completely turned off before transistor T3 is turned on. The use of diodes D1 and D2, therefore, provide a protection means for preventing the simultaneous turning on of transistors T3 and T4 causing permanent damage to transistors T1 and T2.

R1 and C1 are used to control jitter, which is encountered with some motors of this type when used to drive a high-mass, low-friction load.

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