Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-06-21
1995-08-29
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318432, H02P 700
Patent
active
054463629
ABSTRACT:
A thermal protection apparatus for an AC traction motor including a stator, a rotor, a blower fan, and an inverter includes measuring apparatus for measuring ambient air temperature of the motor and atmospheric air pressure of the motor. A computer is provided for using the measured ambient air temperature and atmospheric air pressure values for estimating a plurality of temperatures in the AC traction motor and for calculating a plurality of motor torque limits imposed by the plurality of estimated temperatures. A control system is provided for controlling the inverter by providing a signal comprising the lowest of the calculated plurality of motor torque limits to an inverter controller. The control system can also be used to calculate a plurality of blower speed requirements imposed by the plurality of estimated temperatures and set the blower speed of the motor to the highest of the calculated plurality of blower speed requirements.
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Lafferty Michael H.
McGrath Robert G.
Vanek Laurence D.
General Electric Company
Kratz Ann Marie
Snyder Marvin
Wysocki Jonathan
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