EP0122133A1
Expired / Lapsed
EP
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Electrical winding
Assignee: The General Electric Company PLC
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Filing: 1984-04-06
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Granted: —
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Expires: 2004-04-06
Abstract
Abstract A solenoid, more especially for use in nuclear magnetic resonance spectroscopy where the coil windings need to be very accurately located, has a multiplicity of elongate elements spaced around and accurately positioned on the outside of a cylindrical former, the elements having locating means, conveniently in the form of slots, which together define a helix and these serve to locate a respective coil winding. The elongate elements support a further layer of elements, also having locating means which serve to locate a further winding, and these elements support further elements and so on to provide required number of winding layers. Means are also described for maintaining the solenoid at a substantially uniform temperature.
Inventors
- 👤 Peter Charles Bennett
- 👤 Alastair Neish Grant
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:11
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/02; H01F27/00; H01F27/02; H01F27/027; H01F27/08; H01F7/00; H01F7/06; H01F7/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A solenoid comprising a generally cylindrical former (1), a multiplicity of elongate elements (4) aligned substantially parallel to the former axis regularly circumferentially spaced about and rigidly supported from the former surface, each said element being provided with a set of locating means (10) regularly spaced along its length, adjacent ones of said sets being regularly and successively axially displaced so that said locating means define a helix, and a generally helical electrically conductive winding (11, 12) rigidly located on said elements by said means.
Claim 2
Dependent Claim
85 words
A solenoid comprising a generally cylindrical former (1), a multiplicity of elongate elements (4) aligned substantially parallel to the former axis regularly circumferentially spaced about and rigidly supported from the former surface, each said element being provided with a set of locating means (10) regularly spaced along its length, adjacent ones of said sets being regularly and successively axially displaced so that said locating means define a helix, and a generally helical electrically conductive winding (11, 12) rigidly located on said elements by said means.
Claim 3
Dependent Claim
31 words
A solenoid according to Claim 1 in which each locating means comprises a slot (10) dimensioned so as to prevent axial movement of the part of the winding which it accommodates.
Claim 4
Dependent Claim
66 words
A solenoid according to Claim 1 or Claim. 2 in which the elongate elements (4) are adapted to rigidly support a further layer of similar elongate elements (6) incorporating similar sets of locating means (10') on which a further layer of turns (11', 12') of the winding is located, the further layer of turns being wound in the opposite sense to the first layer of turns.
Claim 5
Dependent Claim
33 words
A solenoid according to Claim 3 wherein each elongate element (6) in said further layer is located directly above and is attached to an elongate element of the supporting layer by an adhesive.
Claim 6
Dependent Claim
36 words
A solenoid according to any preceding Claim in which the elongate elements are formed of aluminium or of glass-filled polyester resin, and are axially located by means of flanges (2) at the ends of the former.
Claim 7
Dependent Claim
75 words
A solenoid according to Claim 5 in which the elongate elements (4) are in the form of glass-filled polyester resin sticks, in which each stick is formed from an even number of mouldings (4a --- 4d) disposed about the central plane, with corresponding mouldings on opposite sides of the plane formed from the same or identical moulds and turned through 180 0 about a radial axis, so that they are mirror images of one another.
Claim 8
Dependent Claim
48 words
A solenoid according to Claim 6 wherein the mouldings (4a --- 4d) of each stick are secured end to end by an adhesive (5), and are accurately positioned with respect to each other whilst the adhesive Is setting by means of a jig engaging the winding locating means.
Claim 9
Dependent Claim
25 words
A solenoid according to any preceding Claim including at least one resistive current shunt (24) connected across a part or the whole of the winding.
Claim 10
Dependent Claim
38 words
A solenoid according to any preceding Claim in which the former (1), together with the elongated elements and winding, are enclosed within an outer casing (16) and means (19, P1) are provided for circulating fluid through the casing.
Claim 11
Dependent Claim
62 words
A solenoid according to Claim 9 having associated with it a first cooling circuit (19) for circulating a cooling fluid through the casing, and an auxiliary cooling circuit (20) for circulating cooling fluid through the casing, and means (TP, P3) controlling the flow of fluid through the auxiliary cooling circuit so as to control the rate of heat removal from the solenoid.
Claim 12
Dependent Claim
85 words
A solenoid according to Claim 9 incorporating a temperature sensitive resistor responsive to changes in the temperature of the cooling fluid within or as it leaves the solenoid, means for supplying current to the solenoid winding controlled by the temperature sensitive resistor in the sense which causes the solenoid current to increase as the temperature rises and to decrease as the temperature falls so as to compensate for expansion or contraction of the solenoid and thereby maintain the field strength of the solenoid substantially constant.
References Cited (Backward Citations)
US1647615A
Cited
US1608673A
Cited
GB274160A
Cited
GB326190A
Cited
US1929187A
Cited
US1876670A
Cited
FR931802A
Cited
US2795765A
Cited
DE1206500B
Cited
FR2509904A1
Cited
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