Two stage electrical braking for a variable speed AC induction motor
US4514677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1983 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Jun 15, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A two-stage electrical braking system for a variable speed alternating current induction motor powered from a variable frequency, variable voltage power source utilizes capacitance connected across a primary winding of the motor in a first stage of braking and short-circuits the primary winding in a second braking stage. The system is arranged such that the control of the two braking stages is independent of the motor terminal voltage and braking can be initiated by either a braking command or automatically upon interruption of power to the system. The control system uses a fixed time delay to initiate the second stage of braking a predetermined time interval after the first stage is initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.