Accurate heat loss evaluation of water-cooled electric motors using a differential ultrasonic calorimeter

Measuring thermal losses of electric motors is important for their design, optimization, and correct pricing after manufacture. This measurement can be conducted by checking the temperature difference of the motor coolant (usually water) between the coolant inlet and outlet. High speed measurement facilitates testing various load scenarios and manufacture throughput; high measurement accuracy and resolution is required for drawing the correct conclusions on the efficiency of design alterations.