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Stepping Motor Damping System

IP.com Disclosure Number: IPCOM000093917D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Criscimanga, TN: AUTHOR

Abstract

Repeatability of positioning of a frictional force damped stepping motor is improved by briefly boosting the motor supply voltage at detent time.

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Stepping Motor Damping System

Repeatability of positioning of a frictional force damped stepping motor is improved by briefly boosting the motor supply voltage at detent time.

The upper time base diagram shows the rotational response to step positions
1...N of an undamped stepping motor receiving stepping commands at T1 and T2. Adding frictional force damping such as a mechanical drum and brake arrangement with adjustable friction force can smooth the motor movement up to the final position N at T3. This response is shown in the lower time base diagram.

To ensure repeatability of positioning at the detent position N, logic circuitry initiates a delay when the last step command is given at T2. The time delay causes a brief boosting pulse of the supply voltage to be applied after the time delay ends at T4. By applying the booster pulse before damping is complete, the pulse magnitude is minimized and thus pulse duration need only be a few milliseconds duration.

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