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Cooling-system-for-electric-motors

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OF PREFERRED EMBODIMENTS A disc drive 100 constructed in accordance with a preferred embodiment of ...

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OF THE PREFERRED EMBODIMENT FIG. 1 shows an electric motor having a stator 2 which is arranged in ...

System and method for detecting deviations in the positioning of a head relative to a track on the disc of a disc storage unit wherein the unit generates a ramp signal having a gradient determined by the position of the track on the disc

In view of the above, the primary object of the present invention is to provide a system for ...

Cooling system for electric motors

Details

Inventors: Workman, John;
Assignee: S.B.W. Engineers Limited (Belfast, GB5)
Primary Examiner: Skudy; R.
Assistant Examiner:
Attorney, Agent or Firm: Mason, Fenwick & Lawrence

The present invention comprises a rotor for an electric motor which rotor is provided with cooling arrangement in the form of a heat pipe extending axially within the rotor. The heat pipe has an evaporating portion within the body of the rotor and a condensing portion extending out with the body of the rotor. Attached to the condensing portion is a shaft extension which is adapted to define a trap for incondensible gases which contaminate the working fluid when in the gaseous state, the trap has a lesser radial dimension than the condensing portion and a pocket is formed in the shaft extension, extending co-axially with the axis of the shaft, and accessible from the exterior of the assembly so as to accommodate a thermal probe to detect the amount of incondensible gas within the trap. When this amount exceeds a predetermined level the rotor is withdrawn from service and the gas removed by an evacuation process.

DETAILED DESCRIPTION I claim: 1.
An electromagnetic machine rotor assembly comprising a rotor shaft internally accommodating a heat pipe which extends axially therealong and has an evaporating portion and a condensing portion, a rotor mounted on the rotor shaft so that the heat pipe evaporating portion lies within the axial confines of the rotor and the condensing portion lies outwardly of the axial extent of the rotor, a first pocket formed in the end portion of the shaft which is adjacent said heat pipe condensing portion, said first pocket being concentric with the shaft axis and opening into said condensing portion, and being of lesser radial dimension than said condensing portion, whereby said first pocket acts as a trap for non-condensible gases within the heat pipe, a second pocket formed in said shaft end portion and open at one end face thereof, said second pocket being coaxial with said shaft axis, one of said first and second pockets being annular and surrounding the other of said first and second pockets.
2.
An assembly as claimed in claim 1, wherein the rotor shaft is formed from a first metal of high structural strength within which the evaporating portion of the heat pipe is defined and from a second metal having high thermal conductivity within which the condensing portion of the heat pipe is defined.
3.
An assembly as claimed in claim 1, including windings mounted on the rotor and subsidiary pipes embedded in said windings on the rotor, each subsidiary pipe having one end connected in fluid communication with the evaporating portion.
4.
An assembly as claimed in claim 1, wherein said shaft end portion includes an axial bore, a hollow end cap being mounted in the end of said bore remote from the condensing portion to form an annular space between said axial bore and the end cap and defining said first pocket.
5.
An assembly as claimed in claim 1, wherein said first pocket is formed by an axial bore in said shaft end portion and said second pocket is defined by an annular recess which surrounds a portion of said axial bore

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