Temperature derivation method for oil film, temperature derivation device, and program

A temperature derivation device for detecting an oil film temperature of a lubricant in a device, the temperature derivation device comprising:

• a measurement unit measuring a dielectric constant of the lubricant by applying an alternating voltage while changing a frequency to an electric circuit configured by the device;
• a derivation unit applying the dielectric constant measured in the measurement unit to a theoretical formula to derive a relaxation time of the lubricant;
• and
• a calculation unit calculating the oil film temperature by using the relaxation time.

A computer program product, comprising a non-transitory computer readable storage medium having instructions encoded thereon that, when executed by a processor, cause the processor to execute process, the process comprising:

• measuring a dielectric constant of a lubricant in a device by applying an alternating voltage while changing a frequency to an electric circuit configured by the device;
• applying the dielectric constant measured in the measuring to a theoretical formula to derive a relaxation time of the lubricant;
• and
• calculating an oil film temperature of the lubricant by using the relaxation time.