Temperature estimation apparatus for estimating temperature of motor

摘要

A coefficient value acquiring unit acquires values of coefficients C and K representing a relationship among a heat generation amount of a motor generated due to a loss Q1(t) of the motor, a temperature variation amount of the motor, and a placement position of a temperature detection device, using the loss Q1(t) of the motor, a detection temperature Td(t), and an ambient temperature Ta of the motor. The temperature estimating unit estimates a temperature Te(t) of the motor based on the values of the coefficients C and K, a preset reference value Cm of the coefficient C, a preset reference value Km of the coefficient K, the detection temperature Td(t), and the ambient temperature Ta of the motor.

主权项

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.