Temperature prediction device, compressor with magnetic bearing mounted thereon, temperature prediction method and program

A temperature prediction method comprising:

• specifying a voltage value applied to an electromagnetic coil based on a distance from a distance detection unit provided in the electromagnetic coil to an output shaft;
• detecting a current value flowing when a voltage is applied to the electromagnetic coil on the basis of the specified voltage value;
• estimating a temperature of the electromagnetic coil on the basis of the specified voltage value, the detected current value, and a relational expression between the voltage value applied to the electromagnetic coil, the current value flowing to the electromagnetic coil in accordance with the voltage value applied to the electromagnetic coil, and the temperature of the electromagnetic coil;
• notifying that the estimated value exceeds a threshold value in a case where the estimated value of the temperature of the electromagnet coil exceeds the threshold value;
• and
• outputting information based on the estimated value in a case where the estimated value does not exceed the threshold value,
• wherein the specified voltage is a measured value or command value of a voltage applied to the electromagnetic coil on the basis of the distance from the distance detection unit provided in the electromagnetic coil to the output shaft,
• the detected current is a current value flowing when a voltage is applied to the electromagnetic coil on the basis of the measured value of the voltage specified by the application voltage specifying unit, and
• the estimated temperature is a temperature of the electromagnetic coil on the basis of the measured value of the specified voltage, the detected current value, and the relational expression between the voltage value applied to the electromagnetic coil, the current value flowing to the electromagnetic coil in accordance with the voltage value applied to the electromagnetic coil, and the temperature of the electromagnetic coil.

A non-transitory computer-readable recording medium storing a program causing a computer to:

• specify a voltage value applied to an electromagnetic coil based on a distance from a distance detection unit provided in the electromagnetic coil to an output shaft;
• detect a current value flowing when a voltage is applied to the electromagnetic coil on the basis of the specified voltage value;
• and
• estimate a temperature of the electromagnetic coil on the basis of the specified voltage value, the detected current value, and a relational expression between the voltage value applied to the electromagnetic coil, the current value flowing to the electromagnetic coil in accordance with the voltage value applied to the electromagnetic coil, and the temperature of the electromagnetic coil;
• notifying that the estimated value exceeds a threshold value in a case where the estimated value of the temperature of the electromagnet coil exceeds the threshold value;
• and
• outputting information based on the estimated value in a case where the estimated value does not exceed the threshold value,
• wherein the specified voltage is a measured value or command value of a voltage applied to the electromagnetic coil on the basis of the distance from the distance detection unit provided in the electromagnetic coil to the output shaft,
• the detected current is a current value flowing when a voltage is applied to the electromagnetic coil on the basis of the measured value of the voltage specified by the application voltage specifying unit, and
• the estimated temperature is a temperature of the electromagnetic coil on the basis of the measured value of the specified voltage, the detected current value, and the relational expression between the voltage value applied to the electromagnetic coil, the current value flowing to the electromagnetic coil in accordance with the voltage value applied to the electromagnetic coil, and the temperature of the electromagnetic coil.