Method and apparatus for the start of single-phase induction motors
OwnerJulio Viola, Jose Restrepo +2inventors
InventorsJulio Viola, Jose Restrepo, Jose Aller, Antonio Ginart
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Abstract
A method and an apparatus for starting single-phase induction motors (SPIM) is disclosed. The apparatus use a rectifier and a DC-AC power converter, to replace the capacitor required in the startup of SPIM, providing high starting torque and eliminating stator overcurrents. The system uses a contactor to connect the SPIM directly to the AC voltage source once the nominal speed is reached. The disclosed method uses synchronization techniques to assure seamless transition of the SPIM from the power converter to the AC voltage source.
Claims10
An apparatus for safe and reliable start of single-phase induction motors (SPIM) comprising:
- a rectifier taking power from the AC line voltage and feeding a DC bus of a power converter;
- the said power converter which feed main and auxiliary windings of the said SPIM;
- a contactor which bypasses the said power converter connecting the said SPIM directly to the AC line voltage.
A start method for said SPIM comprising:
- feeding main and auxiliary windings of said SPIM with a pulse width modulated voltage;
- the transfer of the said SPIM to the AC line voltage by means of a contactor.
Dependencies are inferred from the claim text.