Controller and drive circuit for electric motors
OwnerLudovic Andre Chretien, Michael R. Kollerinventors
Life of this patent
Estimating the term…
Abstract
A controller for an electric motor is provided. The controller includes a processor configured to supply line frequency power to the electric motor through a main switching network, determine to transition from supplying line frequency power to the electric motor to supplying two-phase variable frequency power to the electric motor, synchronize a time base for controlling an output of an inverter with a voltage signal of the line frequency power, open the main switching network to cease supplying line power to the electric motor, and, after a first time period starting from opening the main switching network, supply two-phase variable frequency power to the electric motor using the inverter.
Claims20
A controller for an electric motor, the controller comprising a processor configured to:
- supply line frequency power to the electric motor through a main switching network;
- determine to transition from supplying line frequency power to the electric motor to supplying two-phase variable frequency power to the electric motor;
- synchronize a time base for controlling an output of an inverter with a voltage signal of the line frequency power;
- open the main switching network to cease supplying line power to the electric motor;
- and
- after a first time period starting from opening the main switching network, supply two-phase variable frequency power to the electric motor using the inverter.
A method for controlling an electric motor, the method comprising:
- supplying line frequency power to the electric motor through a main switching network;
- determining to transition from supplying line frequency power to the electric motor to supplying two-phase variable frequency power to the electric motor;
- synchronizing a time base for controlling an output of an inverter with a voltage signal of the line frequency power;
- opening the main switching network to cease supplying line power to the electric motor;
- and
- after a first time period starting from opening the main switching network, supply two-phase variable frequency power to the electric motor using the inverter.
A drive circuit comprising:
- an electric motor;
- a main switching network electrically coupled to the electric motor;
- an inverter electrically coupled to the electric motor;
- and
- a processor configured to:
- supply line frequency power to the electric motor through the main switching network;
- determine to transition from supplying line frequency power to the electric motor to supplying two-phase variable frequency power to the electric motor;
- synchronize a time base for controlling an output of the inverter with a voltage signal of the line frequency power;
- open the main switching network to cease supplying line power to the electric motor;
- and
- after a first time period starting from opening the main switching network, supply two-phase variable frequency power to the electric motor using the inverter.
Dependencies are inferred from the claim text.