Energy storage based dc volts boost for transient high-speed/high-torque operation of variable frequency drive controlled motors
OwnerKevin R. WILLIAMS, Gary PACEinventors
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Abstract
A process for transiently increasing performance of an electric motor includes boosting a DC link voltage of a rectifier-fed variable frequency drive of the electric motor by using an energy storage system. The energy storage system delivers power directly to a DC link of the variable frequency drive. The energy storage system can be at least one of a battery bank, capacitor bank and a flywheel. Feedback from the DC link is delivered to a DC link controller.
Claims20
A system comprising:
- an electric motor having a variable speed drive;
- an AC power supply adapted to supply polyphase AC voltage;
- a rectifier connected to said AC power supply, said rectifier adapted to convert the polyphase AC voltage into a DC voltage;
- a DC link connected to said rectifier so as to pass the DC voltage therefrom;
- an inverter module connected to said DC link so as to convert the DC voltage to an alternating current, said electric motor being electrically connected to said inverter module such that the alternating current drives said electric motor;
- and
- an energy storage system connected to the variable speed drive of said electric motor.
A process for transiently increasing performance of an electric motor, the process comprising:
- boosting the DC link voltage of a rectifier-fed variable speed drive by using an energy storage system, wherein the energy storage system delivers power directly to a DC link of the variable speed drive.
A system for increasing performance of an electric motor, the system comprising:
- an AC power supply adapted to supply polyphase AC voltage;
- a rectifier connected to said AC power supply, said rectifier adapted to convert the polyphase AC voltage into a DC voltage;
- a DC link receiving the DC voltage from said rectifier, said DC link passing the DC voltage to a rectifier-fed variable speed drive of the electric motor;
- and
- an energy storage system that stores electric energy, said energy storage system being connected to said DC link so as to pass power to the DC link and to the rectifier-fed variable speed drive of the electric motor.
Dependencies are inferred from the claim text.