High-resolution incremental position sensor with pulse switching strategy
US6232739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2000 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Feb 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2451
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for determining an incremental angular position of a rotating member of an induction motor. A sensor assembly is positioned adjacent a target wheel attached to the rotating member, the target wheel having a plurality of teeth, separated by slots, angularly spaced around the periphery of the target wheel. The sensor assembly is located proximate the periphery of the target wheel, and includes a plurality of sensors each configured to generate a respective output signal that transitions between first and second states at the passage thereby of each leading and trailing edge of the teeth. The apparatus also includes a processing circuit configured to generate an incremental position signal in response to the output signals. Each sensor is spaced from an adjacent sensor by a predetermined distance equal to 180 degrees divided by n, where n is the number of sensors, and 360 degrees is a tooth-to-tooth distance. The processing circuit has a first mode of operation wherein all of the sensor output signals are used to generate the position signal. The processing circuit also includes a second mode of operation wherein a second number less than all of the output signals are use…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.