Motion detection apparatus for electric motors
US4441076A · kind A · utility
Inventor
Key dates
| Filing date | Oct 14, 1980 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Oct 14, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B7/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for detecting and indicating the motion of electric motors includes a voltage sensing module which can be connected to the power terminals of any known type of electric motor and a display module. In the primary embodiment of the invention the voltage sensing module senses the applied or self-generated voltages present between the motor windings, and when no voltage is present, the display module provides an output which may be an electrical signal, or a visual, tactile or audible display. The apparatus is inherently reliable and fail-safe. A failure of components within the apparatus causes a display module output indicative that the motor is running when in fact it is stationary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.