Angle transducer storing an integral number of revolutions' worth of rotor-pole transition data in memory
US4697168A · kind A · utility
Inventor
Key dates
| Filing date | Oct 20, 1986 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Oct 20, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/645
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An angle transducer includes input rotor and reference rotor assemblies that are mounted for rotation upon a common shaft and that cooperate with respective moveable input stator and fixed reference stator assemblies to produce signals whose phase difference represents an input angle. Diametrically opposed sensors in each stator assembly achieve enhanced eccentricity error reduction by producing separate signals whose phases are averaged after the phase of each is individually measured. A phase measurement technique does not rely upon the mechanical accuracy of the angular placement of the poles for the rotor assemblies. A phase measurement between two signals is performed by beginning on an arbitrary zero crossing of the signal from the reference stator and forming, for each rotor, the sum of the times for the zero crossings for one complete revolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.