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Article: Eliminating the reel motor position sensor in a tape drive.(Tape/Disk/Optical Storage)
- Article from:
- Computer Technology Review
- Article date:
- January 1, 2002
- Author:
CopyrightCOPYRIGHT 2002 West World Productions, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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This article is the second in a two-part series. The first part appeared in the December issue of CTR.
There are several methods that can be used to eliminate the sensor. Unfortunately, none of them work very well for tape drives. Some of these methods include back-EMF sensing, the addition of a sense winding in the motor, or measuring the impedance change of the motor windings by injecting current pulses or a high frequency sense carrier. All of these techniques have been suggested and some have actually been used in a few applications. In the following paragraphs, however, we describe these procedures and discuss the reasons why none of them are suitable in tape ...