Title :
Design of a double-jacketed, closed type calorimeter for direct measurement of motor losses
Author :
Malliband, P.D. ; Carter, D.R.H. ; Gordon, B.M. ; McMahon, R.A.
Author_Institution :
Cambridge Univ., UK
Abstract :
In this paper. we report the use of a closed type calorimeter with a secondary cooling circuit of water and direct measurement of power losses. The target specification is the determination of losses up to 600 W to accuracy of 1 W or about 0.2% of full scale. A second thermally insulating enclosure is used to prevent heat loss through the calorimeter walls and enables accurate direct measurement of the power to be made without increasing the time constant of the thermal system. The calorimeter has been designed for motors up to a frame size of 90S, or about 1.1 kW, which is suited to the measurement of machines for domestic appliances. Initial results show that the calorimeter is accurate to at least 2 W with a resolution of about 0.1 W
Keywords :
electric motors; 90S frame size; calorimeter walls; direct measurement; domestic appliances; double-jacketed closed type calorimeter; heat loss prevention; motor losses measurement; secondary cooling circuit; target specification; thermally insulating enclosure;
Conference_Titel :
Power Electronics and Variable Speed Drives, 1998. Seventh International Conference on (Conf. Publ. No. 456)
Conference_Location :
London
Print_ISBN :
0-85296-704-7
DOI :
10.1049/cp:19980526