Starting device and circuit for starting single phase motors
US5162718A · kind A · utility
Inventor
Key dates
| Filing date | Aug 31, 1989 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Aug 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/445
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An auxiliary capacitance starting device is connected by only two wires to a permanent split capacitor motor. The device includes an auxiliary capacitor and a potential relay which has a set of normally closed contacts and a relay coil. The auxiliary capacitor and the normally closed contacts are connected in series and the relay coil is connected in parallel therewith. The free ends of the two non-polarized wire leads are interchangeably electrically connected to the start and run windings or the run capacitor of the motor to place the circuit in parallel with the start and run windings or the run capacitor such that the relay coil means becomes energized upon detection of voltage representing full motor speed to open the contacts and break the electrical connection between the auxiliary capacitor and the start and run windings. The relay coil becomes de-energized upon detection of no voltage to close the contacts to allow the immediate re-application of electrical power to the common and run terminals of the motor. The components and circuitry are enclosed in a generally rectangular housing which may be mounted on a suitable surface in close proximity to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.