Asynchronized Synchronous Machines by M. M. Botvinnik (Auth.)

By M. M. Botvinnik (Auth.)

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Also preserves its value in the case of synchronous operation of an AS machine. Hence a very important conclusion can be drawn, namely that the total losses in the rotor windings of an AS machine are equal to the losses in the rotor winding of a normal synchronous machine. The second term in equation (66a) determines the power of the excitation system necessary to preserve a power balance. 7oo(ao + aiSo)cosu4, (67) χ equal to the second term of expression (66a). When So^O this magnitude is positive and energy is fed to the stator from the excitation system; when So>0 the value of Δ Ρ becomes negative and surplus energy is fed to the excitation system from the stator.

7 o o cos A A ' the time of this transient can be varied by altering the regulation coefficients αϊ and 24 ASYNCHRONIZED SYNCHRONOUS MACHINES For instance, by altering the sign and magnitude of the coefficient a 2 , it is possible to increase and reduce the effect of the inertia constant J. Since it will be explained further that the regulation principle is only limited by the maximum voltage value at the rotor rings, the construction of the machine can be approached from an economical point of view : it is possible that an increase in the "ceiling" of excitation may, within certain limits, be a cheaper measure than increasing the mechanical inertia of the rotor.

At the same time it must be emphasized that AS motors can hardly be used in the field of traction. If the excitation system of an AS motor has sufficient reserve, it can be used simultaneously as a generator of reactive power — a condenser. F I G . 9. Torque frequency characteristics of an AS m o t o r with a slowly v a r y i n g load. 56 ASYNCHRONIZED SYNCHRONOUS MACHINES I t must be noted also that since AS motors are generally connected directly to the mains, there is no need for the telemetering of the control signal.

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