Electric motor stator winding temperature estimation systems and methods
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United States of America Patent
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-
Apr 16, 2013
Grant Date -
Nov 17, 2011
app pub date -
May 12, 2010
filing date -
May 12, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An electric motor system includes an electric motor comprising a stator with windings and a rotor configured to operate at a motor speed; a cooling system comprising coolant configured to cool the rotor and the stator, the coolant having a coolant flow rate and a coolant temperature; an inverter module coupled to the electric motor and configured to provide current to the windings based on inverter control signals; a current regulated torque controller coupled to the inverter module and configured to generate the inverter control signals in response to a derated torque command; and a temperature estimation controller coupled to the current regulated torque controller and configured to generate the derated torque command based on an initial torque command and an estimated stator winding temperature. The temperature estimation controller is configured to estimate the estimated stator winding temperature based on the motor speed and the coolant flow rate.
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