Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-01-18
1984-01-17
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 64, 310258, H02K 900
Patent
active
044265921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to the field of electrical engineering and is specifically concerned with electrical machines with a superconducting inductor and a gas cooling of normal-conductivity windings.
2. Background Art
There has been proposed an electrical machine (French Pat. No. 1,404,173) comprising a rotor and a stator, whereon windings are disposed. The stator winding is made of a superconducting alloy and arranged inside a cryostat intended to maintain temperatures at which the superconducting state of the winding is possible. The cryostat includes a set of coaxial cylinders interconnected at their end portions. The winding is cooled with a low-temperature liquid coolant which provides for the superconducting state of the winding, such as with liquid helium (He).
The rotor, mounted in rotation bearings and made of an epoxy resin reinforced with prestressed glass fibers, carries the rotor winding made of a normal-conductivity conductor, the rotor winding conductors having passages for a direct cooling.
The rotor is encompassed on the outside by the internal surface of the cryostat housing which is secured on the rotor rotation bearings. The cryostat with the superconducting stator winding is encompassed on the outside by a large-thickness ferromagnetic casing; the casing may be the outside wall of the cryostat housing and protect from the external atmospheric pressure.
The terms "external surface of the cryostat" and "internal surface of the cryostat" will hereinafter denote the cryostat housing surfaces which face the stator and the rotor respectively.
The use of a rotor winding with a direct cooling results in a non-uniform temperature distribution over the winding length, since the coolant is heated as it flows along the cooling passage provided inside the winding conductors. This heating causes a premature thermal ageing of the insulation in the zone of higher temperatures of the winding and hence impairs the operational dependability of the machines.
The fastening of the cryostat housing on the rotor rotation bearings causes the rotor vibration arising from a remaining unbalance of the rotor as well as the vibration originating in working members of driven mechanisms be transmitted to the stator's superconducting winding, which affects the stability of its operation and impairs the operational dependability of the machine.
SUMMARY OF INVENTION
The invention has as its aim to provide such an electrical machine with a superconducting inductor and a gas cooling of normal-conductivity windings, wherein the relative arrangement of cooled machine units and cooling system passages ensure equalization the temperature over the length of the stator and rotor windings along with a break of the mechanical coupling which transmits vibration from the rotor to the superconducting winding of the stator, whereby the operational dependability is enhanced.
The aim set forth is attained by an electrical machine with a superconducting inductor and a gas cooling of normal-conductivity windings, comprising a stator with a superconducting winding disposed in a cryostat and a rotor with a cooled winding disposed on its body, the rotor being mounted in rotation bearings. According to the invention, the stator carries a winding which balances the electromagnetic moment of the rotor, acting upon the superconducting winding of the stator, and which is made of normal-conductivity conductors. The stator is provided with a housing to whose walls the cryostat is secured so as to define a gap for the passage of a gaseous coolant between the external surface of the cryostat and the normal-conductivity winding of the stator.
The arrangement and fastening of the cryostat on the stator breaks the mechanical linkage between the rotor and the superconducting winding and thereby eliminates a transfer of vibration from the rotor and driven mechanisms to the superconducting winding. This enhances the stability of its operation, while the cryostat breaks the thermal coupling through
REFERENCES:
patent: 2427731 (1947-09-01), Lynn
patent: 3457439 (1969-07-01), Gering
patent: 3742265 (1973-06-01), Smith
patent: 3932778 (1976-01-01), Watanabe
patent: 4020373 (1977-04-01), Yamamoto
patent: 4058746 (1977-11-01), Mole
patent: 4233533 (1980-11-01), Lown
Berzin Evgeny K.
Miroshnichenko Anatoly G.
Yantovsky Leonid I.
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