US Patent No. 9,091,600

TEMPERATURE ESTIMATION APPARATUS FOR ESTIMATING TEMPERATURE OF MOTOR


Patent No. 9,091,600
Issue Date July 28, 2015
Title Temperature Estimation Apparatus For Estimating Temperature Of Motor
Inventorship Tatsuya Senoo, Yamanashi (JP)
Assignee Fanuc Corporation, Yamanashi (JP)

Claim of US Patent No. 9,091,600

1. A temperature estimation apparatus comprising:
a loss calculating unit for calculating, in a preset period of time, a loss of a motor;
a detection temperature acquiring unit for sequentially acquiring a detection temperature detected by a temperature detection
device disposed in the motor which varies due to a difference in placement of the temperature detection device, in each preset
sampling period over the preset period of time;

a coefficient value acquiring unit for acquiring a value of a coefficient which corresponds to a relationship among a heat
generation amount of the motor generated due to the loss, a temperature variation amount of the motor, and a placement position
of the temperature detection device, by using the loss calculated by the loss calculating unit, the detection temperature
acquired by the detection temperature acquiring unit, and an ambient temperature of the motor;

a storage unit for storing a heat generation amount of an individual body of the motor, a temperature variation amount of
the motor, and a value of a coefficient due to a placement position of the temperature detection device as reference values,
which are obtained by using said coefficient value acquiring unit in the individual body of the motor serving as a reference;
and

a temperature estimating unit for estimating a temperature of the motor based on the value of the coefficient, a reference
value of the coefficient, the detection temperature acquired by the detection temperature acquiring unit, and the ambient
temperature of the motor.