TY - GEN
T1 - Evaluation and modelling of cross saturation due to leakage flux in vector controlled induction machines
AU - Gerada, C.
AU - Bradley, K.
AU - Sumner, M.
AU - Sewell, P.
N1 - Publisher Copyright:
© 2003 IEEE.
PY - 2003
Y1 - 2003
N2 - A detailed magnetic, reluctance based, computational model of an induction machine into which a traditional, rotor-flux-orientated, vector, control-scheme has been grafted, is used to examine the influence of saturation of both main and leakage flux paths upon vector controlled drive performance. Individual machine teeth, windings and conductors are incorporated, as is pseudo 3 dimensional modelling of skew. The cross saturation effect is therefore determined from the basic dimensional, and winding, design data of the machine. Effective compensation methods can then be derived for practical implementation. Direct, rotor flux orientation and magnitude control is used to ensure that inaccuracies in a machine parameter based vector control scheme are not reflected in the results for cross saturation. Results for a 15 kW, 4 pole induction motor with rotor skewed 1 stator slot pitch show that skew leakage flux is predominantly responsible for cross saturation. The skew leakage flux is shown to heavily saturate one end of the machine and to reduce the air gap flux density at the other. At 200% rated load current this equates to a 20% reduction in direct axis flux if id is kept constant. To compensate for this reduction a 40% increase in id would be required.
AB - A detailed magnetic, reluctance based, computational model of an induction machine into which a traditional, rotor-flux-orientated, vector, control-scheme has been grafted, is used to examine the influence of saturation of both main and leakage flux paths upon vector controlled drive performance. Individual machine teeth, windings and conductors are incorporated, as is pseudo 3 dimensional modelling of skew. The cross saturation effect is therefore determined from the basic dimensional, and winding, design data of the machine. Effective compensation methods can then be derived for practical implementation. Direct, rotor flux orientation and magnitude control is used to ensure that inaccuracies in a machine parameter based vector control scheme are not reflected in the results for cross saturation. Results for a 15 kW, 4 pole induction motor with rotor skewed 1 stator slot pitch show that skew leakage flux is predominantly responsible for cross saturation. The skew leakage flux is shown to heavily saturate one end of the machine and to reduce the air gap flux density at the other. At 200% rated load current this equates to a 20% reduction in direct axis flux if id is kept constant. To compensate for this reduction a 40% increase in id would be required.
KW - Computational modeling
KW - Conductors
KW - Induction machines
KW - Induction motors
KW - Machine vector control
KW - Machine windings
KW - Magnetic flux
KW - Rotors
KW - Saturation magnetization
KW - Teeth
UR - http://www.scopus.com/inward/record.url?scp=33845596658&partnerID=8YFLogxK
U2 - 10.1109/IEMDC.2003.1210723
DO - 10.1109/IEMDC.2003.1210723
M3 - Conference contribution
AN - SCOPUS:33845596658
T3 - IEMDC 2003 - IEEE International Electric Machines and Drives Conference
SP - 1983
EP - 1989
BT - IEMDC 2003 - IEEE International Electric Machines and Drives Conference
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Electric Machines and Drives Conference, IEMDC 2003
Y2 - 1 June 2003 through 4 June 2003
ER -