DocumentCode :
3471397
Title :
Improvements to precision measurement of stray load loss by calorimeter
Author :
Bradley, K.J. ; Ferrah, A. ; Magill, R. ; Clare, J.C. ; Wheeler, P. ; Sewell, P.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nottingham Univ., UK
fYear :
1999
fDate :
1999
Firstpage :
189
Lastpage :
193
Abstract :
Induction machine stray load losses have always been difficult to determine with precision, so it has been difficult to refine methods of their prediction. This paper provides further description of and results from an improved form of air-cooled calorimeter used to measure the stray load losses of induction machines. Losses may be determined for either loaded or unloaded operation. By adjusting the set mass flow rate of coolant, the calorimeter is capable of measuring losses ranging from 1.5 kW to 6 kW full scale. Absolute errors are 5W in measurement and resolution is to 0.1W with averaging. However, it is the total machine loss that is measured accurately. Stray load loss is then evaluated by loss segregation. This again imposes a particular “loss model” which may not be correct but is directly comparable to international standards
Keywords :
asynchronous machines; 1.5 to 6 kW; absolute errors; air-cooled calorimeter; coolant mass flow rate; induction machines; international standards; loss segregation; precision measurements; stray load losses;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Electrical Machines and Drives, 1999. Ninth International Conference on (Conf. Publ. No. 468)
Conference_Location :
Canterbury
ISSN :
0537-9989
Print_ISBN :
0-85296-720-9
Type :
conf
DOI :
10.1049/cp:19991016
Filename :
816382
Link To Document :
بازگشت