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US 5,294,875 AGranted
Enhanced polyphase motor operation using a solid state inverter
AssigneeOtis Elevator Company
InventorNarasimha K. Reddy
Life of this patent
Estimating the term…
Abstract
A polyphase motor is powered by an inverter. Each phase winding in the motor comprises two electrically insulated, electromagnetically coupled, conductors, making up a "phase bundle." Each conductor in the bundle is powered by its own transistor drive. The drives for each phase winding respond to a common phase signal for instance from a pulse width modulator.
Claims3
A polyphase motor drive including an inverter and a polyphase motor, comprising:
- a plurality of phase drives, each phase drive responsive to a phase drive input signal, each phase drive for providing a current signal;
- a motor having a plurality of phase windings, each winding comprising at least two electrically insulated, electromagnetically coupled conductors wound together, each conductor corresponding to one of said phase drives, each of said conductors being responsive to a corresponding one of said current signals for providing current to said motor.
A polyphase motor drive, including a polyphase motor, comprising:
- a plurality of phase drives, each phase drive including a pair of complementary transistors, each phase drive responsive to a phase drive input signal, each phase drive providing a current signal;
- a motor having a plurality of phase windings, each phase winding comprising at least two electrically insulated conductors, each conductor corresponding to one of said phase drive, each conductor responsive to a corresponding one of said current signals for providing currents to said motor.
Dependencies are inferred from the claim text.