Electricity: motive power systems – Induction motor systems – Braking
Patent
1998-06-15
1999-08-24
Ip, Paul
Electricity: motive power systems
Induction motor systems
Braking
318803, 318764, H02P 320
Patent
active
059428740
ABSTRACT:
The invention relates to a method of ensuring the stability of a synchronous machine in controlling the synchronous machine on the basis of direct control of flux and torque, in which the torque generated by the synchronous machine is increased/decreased by increasing/decreasing the instantaneous angular velocity of the stator flux. In accordance with the invention, the method comprises the steps of determining the direction of the stator flux vector (.psi.s) in rotor coordinates (dq), and forcing the stator flux vector (.psi.s) to remain in quadrants I and IV (Q1, Q4) of the rotor coordinates by rotating the stator flux in the rotor coordinates to a necessary degree.
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"Analysis of Direct Torque Control in Permanent Magnet Synchronous Motor Drives", L. Zhong, M.F. Rahman, W.Y. Hu, and K.W. Kim, IEEE Transactions on Power Electronics, vol. 12, No. 3, May 3, 1997, pp. 528-535.
Pyrhonen Olli
Vaananen Janne
ABB Industry OY
Ip Paul
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