Lowe Hauptman & Ham, LLP
Motor winding overheat prevention apparatus and motor control apparatus
A winding overheat prevention apparatus comprises: a stator winding temperature calculation unit which calculates winding temperature based on the ambient temperature of the motor and on the amount of change in the estimated temperature of a stator winding; a position sensor temperature detection unit which detects the temperature indicated by a temperature sensing element in a position sensor a rotor; and an alarm signal output unit which outputs an alarm signal when the winding temperature exceeds an alarm level, wherein when the ambient temperature is not higher than a prescribed temperature, the alarm level is set equal to a temperature preset based on the ambient temperature and the maximum value of the amount of the temperature change, while when the ambient temperature is higher than the prescribed temperature, the alarm level is set equal to a temperature preset in order to protect the position sensor from overheating.
Fanuc Corporation
H
H02P
inventional
SeungJun Hidetoshi
Lee Uematsu