Electric brake for an alternating current motor
US5705903A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | Jan 6, 1998 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric brake circuit (10) for bringing an alternating current (AC) motor (12) to a rapid halt. When the AC motor is turned on, a braking capacitor (C1) is charged to a preselected voltage. A shunt regulator (18) prevents the braking capacitor from overcharging by shunting charging current to ground once the braking capacitor reaches the preselected voltage. In a preferred embodiment, a limit circuit (20) turns off the charging current on the subsequent positive phase of the AC line voltage powering the electric brake. By shutting off current flow to the circuit when the preselected voltage on the capacitor is reached, power consumption and size of the circuit are minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.