| WARF: P93168US |  |
| Method and Apparatus for Transducerless Flux Estimation in Drives for Induction Machines |
| INVENTORS | • | Patrick Jansen, Robert Lorenz |
OVERVIEW
An alternating current (AC) induction motor typically tracks and controls motor torque and/or speed using mechanical transducers within it. As switching mechanisms controlling power, transducers are part of the machine power drive. Current transducer technology encumbers the low cost induction motor, adding cost, failure rate, and size.
This invention is a controlled drive system for a polyphase AC motor. It senses the magnetic flux vector position and/or speed offering a transducerless method and apparatus for induction motor torque control. It includes:
- an induction motor with stator windings and a rotor whose position is virtually impedance free as seen by the windings;
- a drive means connected to the stator windings providing power at both a drive frequency, sufficient to magnetically saturate the stator, and a higher signal frequency; and
- a means for measuring the response of the stator windings to determine magnetic flux vector position and/or speed.
KEY BENEFITS
- applies to squirrel cage induction motors, with open or semi-closed rotor and stator slots, and linear motors;
- provides parameter insensitive, dynamic estimates of the flux vector position and speed, even at zero and low speeds;
- offers uninterrupted system performance with a novel signal injection and demodulation scheme;
- may include an inverter;
- reduces motor cost, failure rate, and volume.
ADDITIONAL INFORMATION
Intellectual Property Status
Tech Fields
Engines & Power Electronics - Motors
CONTACT INFORMATION
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