Method and apparatus for monitoring motor status using...

Details Method and apparatus for monitoring motor status using... Method and apparatus for monitoring motor status using...

2007-10-09

2007-10-09

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S800000, C318S806000, C318S809000, C318S811000, C318S799000, C318S798000, C318S767000

Reexamination Certificate

active

11231014

ABSTRACT:
A motor drive unit includes a controller, a voltage inverter, and a speed estimator. The controller is operable to generate at least one command signal for controlling a motor associated with the motor drive unit. The voltage inverter is operable to generate motor drive signals to be applied to the motor based on the command signal. The speed estimator is operable to estimate a speed of the motor when the voltage inverter is not providing the motor drive signals. The speed estimator is further operable to receive two-axis voltage measurements associated with the motor, determine flux angles for the motor based on the two-axis voltage measurements, and estimate the speed based on the determined flux angles.

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