Apparatus for full voltage start of vibratory excitors
US4320328A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1979 |
| Grant date | Mar 16, 1982 |
| Priority date | — |
| Expiry date | Aug 3, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved apparatus for an automatic full voltage start of a polyphase synchronous or induction motor. A full line voltage is employed to start the motor by energizing two tap relays to shunt the tap connections of the coils of an autotransformer and to thereby apply a line voltage to the primary windings of the motor. A strap relay is de-energized to disconnect the coils of the autotransformer when the motor is at rest and when the motor is being started. After the motor is started, the tap relays are de-energized to break the shunt connections and the strap relay is energized to connect the coils of the autotransformer. The taps of the autotransformer apply a preset reduced voltage to operate the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.