Device and method for sensing temperature of a rotating electromagnetic machine

A clothes washing machine system, comprising

• a cabinet;
• a drum situated to rotate inside the cabinet;
• a motor operably connected to the drum to rotate the drum, the motor including an energizable winding;
• a motor drive connected to the winding;
• a temperature measurement device connected to the motor drive;
• a processor programmed to determine a temperature calibration parameter based on the temperature of the motor drive and a first resistance value of the winding and which is also programmed to determine the first and second resistance values by applying current to the winding and determining a voltage level required in order to maintain the current at a desired level;
• and
• wherein the processor is further programmed to determine a temperature value of the motor based on the calibration parameter and a second resistance value of the winding.

A motor system, comprising:

• a motor having an energizable winding;
• a motor drive connected to the winding;
• a temperature measurement device connected to the motor drive;
• a processor programmed to determine a temperature calibration parameter based on the temperature of the motor drive and a first resistance value of the winding while the motor is idle;
• and
• wherein the processor is further programmed to determine a temperature value of the motor based on the calibration parameter and a second resistance value of the winding while the motor is in operation.

A clothes washing machine system, comprising

• a cabinet;
• a drum situated to rotate inside the cabinet;
• a motor operably connected to the drum to rotate the drum, the motor including an energizable winding;
• a motor drive connected to the winding;
• a temperature measurement device connected to the motor drive;
• a processor programmed to determine a temperature calibration parameter based on the temperature of the motor drive and a first resistance value of the winding and which is also programmed to determine the first and second resistance values by applying current to the winding and determining a voltage level required in order to maintain the current at a desired level while the motor is idle;
• and
• wherein the processor is further programmed to determine a temperature value of the motor based on the calibration parameter and a second resistance value of the winding while the motor is in operation.