Browse Prior Art Database

Adaptive Detent

IP.com Disclosure Number: IPCOM000086131D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cameron, TJ: AUTHOR [+2]

Abstract

A detent system is described which has the ability to adapt to external force requirements to obtain a quasi stable state, while maintaining a fast response time for increasing force requirements.

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Adaptive Detent

A detent system is described which has the ability to adapt to external force requirements to obtain a quasi stable state, while maintaining a fast response time for increasing force requirements.

The top figure shows a block diagram of the circuit including the motor 10 to be used in the detent system. When the motor shaft is not in the detent position, a maximum reverse torque is applied through amplifier 12. This torque is removed when the detent position is reached. However, if an external torque is present, the shaft will have a forward acceleration, and the detent position will not be maintained. In this case the reverse torque will have to be applied to reenter the detent position.

To prevent undesired oscillatory motion under these conditions, a shunt channel is provided including step and hold circuit 14 to store a small force drive to be used in the detent zone to cancel some of the forward acceleration force. After a few cycles into and out of the detent zone, a force near equal and opposite the forward force is obtained and no further motion occurs.

The actual circuit is shown in the lower figure and this circuit incorporates some decay in the stored force to account for decreasing forward force. When a decay in stored drive is included, a low-frequency oscillatory motion must exist, however, by proper selection of time constants, the resulting low-frequency oscillatory motion can be held below objectionable levels.

The stored voltage...