Non-excited operation type electromagnetic brake control device and method
US8786997B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2010 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Feb 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P15/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A non-excited operation type electromagnetic brake control device and method which are free from vibration noise and frequent switching when reducing average current which flows through a brake coil in a holding state of a non-excited operation type electromagnetic brake are provided. An acute triangle voltage wave generation unit generates a stepped acute triangle voltage wave which is formed by valley parts with a first angle and peak parts with a second angle smaller than the first angle arranged alternatively. A comparative voltage wave generation unit generates a comparative voltage wave based on current which flows through the brake coil. A comparison unit compares the acute the triangle voltage wave with the comparative voltage wave when the non-excited operation type electromagnetic brake is in the holding state. A switch performs switching to supply current to the brake coil when the acute triangle voltage wave is larger than the comparative voltage wave and to cut off the supply of current to the brake coil when the acute triangle voltage wave is not larger than the comparative voltage wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.