Electricity: motive power systems – Synchronous motor systems – Field winding circuits
Patent
1981-12-18
1984-08-07
Skudy, R.
Electricity: motive power systems
Synchronous motor systems
Field winding circuits
310 58, 310 68D, 323237, 323360, H02P 736
Patent
active
044646178
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
1. Background of the Invention
The invention relates to the art of electrical engineering, and particularly to a superconducting synchronous electric machine.
2. Background Art
Known in the art is a direct current electric machine (German accepted patent application No. 2,027,673, Cl. H02K 23/58, published in 1972) which is provided with a compensating winding equalizing an electromagnetic movement of reaction of an armature, acting on a superconducting excitation winding. The above specified electric machine provides a principal solution to the problem of compensating the armature reaction.
However, with varying loads on the shaft, the value of the electromagnetic moment acting on the superconducting winding changes. At the same time, it is necessary to provide for a continuous control of the value of a current flowing through the compensating winding depending on the value of a current within the armature winding, in order to obtain compensation under any loading conditions. Such a control should be carried out in an inertialess manner since the mismatch (lag and advance) of the currents within compensating and armature windings is not permissible. Otherwise, even the instantaneous absence of compensation of the reaction moment of the armature results in the failure of supports of the superconducting winding due to large mechanical loads.
Attempts have been made to solve this problem. Thus, known in the art is an electric machine (USSR Author's Certificate No. 396,792 Int. Cl. H02K 19/00, Published Aug. 29, 1973) wherein the compensation of the armature reaction moment is ensured by means of two windings which are movable with respect to each other. In this electric machine the excitation winding (field) consists of two windings one of which is superconducting and the other is compensating. The superconducting winding is disposed inside the rotating armature, while the other winding is located outside this armature. In order to compensate the armature reaction moment and to eliminate forces acting on the superconducting winding mounted in a cryostat, this winding is rotatably mounted with respect to the other (compensating) winding. Under the conditions of load variations in this machine it is necessary to ensure a corresponding change in the angle of rotation of the superconducting winding relative to the compensating winding, which is accompanied by considerable performance and design difficulties, especially because of mechanical sluggishness of the cryostat with the superconducting winding.
Also known in the art is a synchronous electric machine (USSR Author's Certificate No. 369,659 Int. Cl. H02K 3/20, Published Feb. 8, 1973) wherein there is provided an automatic compensation of the armature reaction moment.
The above machine comprises a field provided with a superconducting excitation winding, a compensating winding, and a current collecting device comprising a commutator and brushes. A compensating device is constructed as a distributed compensating winding which is stationary with respect to the field structure and is provided with pairs of poles whose number is equal to that of the machine. This compensating winding is connected in series, through the commutator and brushes fixed stationary with respect to the field, to the armature winding, the axes of phases of the compensating winding displaced relative to the axes of phases of the armature winding by an angle of 180.degree.. To decrease a voltage between commutator bars, the armature winding is proposed to be connected to the compensating winding through current transformers.
In this electric machine the armature reaction flow rotates in synchronism with the field, and to compensate the above flow it is necessary to create a rotating opposite flow of the compensating winding. In the considered machine the compensating winding which is stationary relative to the armature is formed by means of the commutator and brushing device. The latter forms a required number of phases from the total number of turns of the collector windi
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A New Thyristor Controlled VAR Compensator Design; A. E. Hammad et al; Canadian Comm. & Pwr. Conf.; Montreal, Canada; Oct. 18-20, 1978.
"Converter Elements" by V. S. Rudenko; Moskau, 1980, pp. 113-116.
Berzin Evgeny K.
Miroshnichenko Anatoly G.
Yantovsky Leonid I.
Kharkovsky Politekhnichesky Institut
Skudy R.
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