Sensorless rotor velocity estimation for induction motors

Details Sensorless rotor velocity estimation for induction motors Sensorless rotor velocity estimation for induction motors

1997-01-21

1998-03-17

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318616, 318798, H02P 540

Patent

active

057291136

ABSTRACT:
A method for estimating rotor shaft velocity includes adding two counter rotating signal components to a fundamental motor control signal to provide a combined control signal; sensing at least one motor phase signal; determining an extracted portion of the motor phase signal representative of the two counter rotating signal components; and using the extracted portion to estimate rotor shaft velocity. The step of adding two counter rotating signal components may include either adding a single phase signal in a reference frame synchronous to the fundamental motor control signal or adding two separate signals.

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patent: 5585709 (1996-12-01), Jansen et al.
"Transducerless Position and Velocity Estimation in Induction and Salient AC Machines" By PL Jansen, et al, IEEE-IAS Annual Meetting, Oct. 1994, PG. 488-495 Denver.
"Sensorless Direct Field Orientation at Zero Flux Frequency" By F. Baschke, et al, IEEE-IAS Annual Meeting Oct. 1996. pp. 189-196.

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