Method and apparatus for detecting winding errors in an electric motor stator
US5907244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Jul 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting winding errors in electric motor stators having a plurality of field windings is disclosed. The method involves the steps of applying a current source to at least one of the field windings to generate a magnetic field within the stator, measuring the polarity and strength of the field for each winding at preselected radial and angular positions about a circumference of the stator bore, and comparing the measured values to recorded values of radially and angularly corresponding measurements for a reference motor stator. Preferably, the current source is applied to each of the windings in succession. The apparatus includes a terminal block, switch, and power supply to connect a source of current to each field winding in succession to generate a magnetic field within the stator. In one embodiment, the apparatus includes a magnetic sensor mounted at a predetermined radial position for rotation on a shaft, and an encoder proximate the shaft to determine the angular position of the shaft. In a second embodiment, the apparatus includes a plurality of magnetic sensors mounted at preselected radial and angular positions about an arbor or drum sized to fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.