| 摘要 |
PURPOSE: A method for indirectly measuring the average temperature of a permanent magnet in a rotor arranged in a permanent magnet synchronous motor is provided to efficiently and precisely measure the temperature of a permanent magnet in a rotor without changing the structure of a permanent magnet synchronous motor. CONSTITUTION: The amount of changed torque generated in an electric motor is hourly extracted to obtain hourly torque data(S10). Torque data by temperature is obtained by using the data of residual magnetic flux density by temperature(S20). The hourly average temperature of a permanent magnet is calculated by using the hourly torque data and the torque data by temperature(S30). [Reference numerals] (AA) Start; (BB) End; (S10) Obtaining torque data according to time; (S20) Obtaining torque data according to temperature; (S30) Calculating the average temperature of a permanent magnet according to time |
