An excitation control scheme for a two-axis excited synchronous motor is described, which, by the direct connection of the quadrature field winding and the armature circuit through a diode bridge rectifier, enables the motor power factor to be maintained at approximately unity, irrespective of load. The steady-state performance based on a simple phasor diagram is verified by experimental results.
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References
1.
MaW. F., ‘Controlled excitation for unity power factor operation of a synchronous motor’, IEEE Trans, on Ind. Electron. and Instrum., IECI-23, pp. 331–332 (August, 1976).
2.
WilliamsonA. C., ‘A new connection for synchronous motor excitation’, Proc. IEE, 127, Pt. B, No. 3, pp. 169–173 (May, 1980).
