SU67545A1 - Electric machine - Google Patents

Description

Said September 6, 1945 to the Narkomoborov for 9910 (340931) Published December 31, 1946

Generator sets are known with an asynchronous generator providing a constant frequency current with a variable number of inverters and driven by a frequency converter.

Generator self-excitation

a multiphase current from a brushless driver, sitting on a common axis with the generator and excited by alternating current, is also not new.

The use of the asynchronous machine excited by the multi-phase current as an exciter is also not HOBOi.

The subject of the present invention is an electric machine unit for obtaining a multiphase current of immeasurable frequency at a variable rotational speed of the prime mover, similarly known, consisting of an asynchronous generator driven from a rotor with a multiphase current: from an exciter sitting on the same shaft with it. frequency converter. In such an assembly, according to the invention, a non-contact asynchronous machine with a multiphase stator, fed by the current

frequency, - and multi-phase rotor, the winding of which is connected to the winding of the generator rotor but the wires. located; inside the shaft of the unit.

The foregoing is illustrated in the drawing,; which shows the electrical circuit of the proposed unit.

The unit consists of two asynchronous machines 7, 2 and 5, 4, rotors 2 W. 4 a: which sit t) and one shaft 5 driven by any engine.

L-bus-line /, 2 is a generator, and the machine 3, 4 is the pathogen, and the dimensions of the latter are insignificant and correspond to the reactive power expended to excite the generator and the active power transmitted electrically from the exciter to the generator or vice versa.

Stator The driver is powered by an independent AC source of a given frequency that one wishes to receive from the generator. However, it is also possible here to apply the principle of self-excitation from the generator output I, 2. The excitation current from the rotor 4 of the exciter is fed inside the shaft.

5 n, and the rotor 2 of the generator, since both machines can be combined into one common body. The load is removed from the stator 1 of the generator. There are no any rubbing contacts.

When calculating and designing the proposed unit, the excitation winding and the core on the generator and the exciter can vary in their names and locations. . For example, it is possible to remove the load from the rotor, etc.

The principle of obtaining an unchanged frequency of sen from the drawing, where for 1F. ESTIMATES of reasoning, instead of the number of revolutions indicated, is connected with them through the frequency of the oiap poles of the frequency.

Actually, / 3 may differ from / 1, respectively, according to the values of the numbers of the pairs of poles of the rotors and stators.

The unit can work when the rotation of the rotor 4 of the exciter coincides with the rotation of the field of its stator 3, and | Rotation of the floor of the rotor 2 of the generator coincides with the rotation; the rotor itself from the drive. In this case, the exciter is induced in the rotor 4 with the difference frequency fz fz - fi, and in the generator stator 1 the voltage is induced with the frequency of the sum f А + 2/3, i.e. exciter 6.

The aggregate can also work when the exciter is the sum or difference of the same frequencies in the driver 3, 4, and the difference is 1B generator 1, 2: f / 1 - / 2 4; / 3, i.e. again, the given frequency.

When constructing an aggregate, the condition should be met that the frequency differences indicated above would not change their sign for all relshmam work, since in this case, i.e., at f, f-2 or / 2 fi, induced by life is equal to zero.

As for the output voltage, it does not depend on the drive speed, i.e., with the voltage applied by the driver, the frequency also varies, and due to the inductance prevailing in the generator excitation winding, the current in it and The small field remains unambiguous.

In order to maintain the generator voltage unchanged with increasing load, a voltage regulator 7 can be applied, which will affect the primary pathogen 6.

As a primary driver 6, for example, an AC inverter equipped with an electric speed controller can be used. In this case, if there are several units operating from different drives, they can all be powered from one inverter (line 8) and then their frequencies will always automatically coincide with each other, which is important when operating the generators in parallel with the aircraft.

As the primary exciter 6, an oscillating circuit set up for a given frequency should also be used, which is placed in the same housing with the unit. In this case, the unit will operate on the principle of self-excitation.

Subject invention

The electric machine for obtaining a multiphase current of constant frequency at a variable rotational speed of the prime mover, consisting of an asynchronous generator driven from the rotor with a continuous current from one sitting on an exciter on a single shaft — a frequency converter that differs from that in quality The specified converter uses a contactless asynchronous machine with a multiphase stator powered by a current of the required frequency and a multiphase rotor, the winding of which is connected to the generator rotor winding through wires, aspolozhennym inside the machine shaft.

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