Power and temperature independent magnetic position sensor for a rotor
US4746859A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Dec 22, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/777
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to optimize the electrical performance in motors in terms of improved efficiency, power factor, and reduced current, a power and temperature magnetic position sensor for a rotor utilizes first and second magnetic sensing devices for accurately determining the angular position of the rotor. The first and second magnetic sensing devices include at least one target operatively associated with the rotor so as to rotate therewith, a first sensor disposed at a variable distance from the target dependent upon the angular position of the rotor to define a first air gap therebetween, and a second sensor disposed at a variable distance from the target dependent upon the angular position of the rotor to define a second air gap therebetween. The first and second sensors cooperate with the target to detect magnetic field intensity in the first and second air gaps, respectively, and produce output signals indicative of the magnetic field intensity which, at any point in time, is dependent upon the length of the first and second air gaps as determined by the position of the first and second sensors relative to the target at that point in time. The first and second sensors are also operat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.