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US 5,490,198 AGranted
Device for driving a rotary anode
AssigneeU.S. Philips Corporation
InventorDieter Gerling
Life of this patent
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Abstract
The invention relates to a device for driving the rotary anode of an X-ray tube, which device comprises a drive motor (5) having a stator (5a) and a rotor (5b), which are operated at anode potential, a rotor shaft (6) driving the rotary anode (7), the rotor (5b) of the drive motor (5) being constructed as an external rotor and the motor (5) being powered by means of a potential-isolating transmission means.
Claims4
A rotary anode X-ray tube comprising:
- (a) an enclosure comprising a first non-evacuated enclosure part and a second evacuated enclosure part,
- (b) a shaft journalled for rotation in the second enclosure part about an axis,
- (c) an anode mounted on one end of the shaft and within the second enclosure part,
- (d) a drive motor having a stator and a rotor for driving the anode, said stator being located within the first enclosure part,
- (e) means for applying to said anode, rotor and stator the same electrical potential,
- (f) said stator comprising a magnetic part and windings on the magnetic part,
- (g) said anode being axially spaced from the stator,
- (h) said rotor being within the second enclosure part and cylindrically configured as an external rotor and surrounding the stator and being connected to the shaft to rotate therewith,
- (i) said rotor comprising inner and outer concentric abutting cylindrical members of different materials, the inner cylindrical member comprising a material of high electrical conductivity, the outer cylindrical member comprising a material of high magnetic conductivity,
- (j) power transmission means for applying an electrical potential to the motor for driving same, said power transmission means comprising electrical potential isolating means for isolating the motor from the source of the electrical potential.
7 more elements
Dependencies are inferred from the claim text.