Soft start system for motors utilizing variable frequency drive and autotransformer
US7508160B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2006 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Jan 6, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/426
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A soft start system for starting large motors has a power supply suitable for passing power to the motor, a variable frequency drive connected to the power supply and an autotransformer connected between the variable frequency drive and the motor for passing power of an elevated current to the motor. A switch is connected between the motor and power supply for connecting the motor to the power supply when the motor reaches a desired speed. The autotransformer includes a single core with a winding extending over the single core. The autotransformer includes a first terminal connected the variable frequency drive, a second terminal connected the motor and a grounded neutral.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.