Apparatus and method to generate braking torque in an AC drive
AssigneeRobicon Corporation
InventorsPeter W. Hammond, Mukul Rastogi
Life of this patent
Estimating the term…
Abstract
A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the normal operating frequency, is supplied to produce braking torque. The level of braking can be controlled to generally consume some or all of the braking in the device or motor. More than one braking frequency may be utilized. In addition, the relationship between the normal and braking frequency(s) can be maintained to limit motor pulsation.
Claims15
A method for producing counter-rotating torque in an AC motor comprising:
- generating commands in a rotating coordinate system to generate normal and loss-inducing frequency components for said motor;
- converting said commands from said rotating coordinate system to a stationary coordinate system;
- and
- using said commands to modulate power for said motor, said power having two or more frequency components, at least one of which is a loss-inducing frequency component to produce said counter-rotating torque.
Dependencies are inferred from the claim text.