X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1998-11-24
2000-10-31
Porta, David P.
X-ray or gamma ray systems or devices
Source
Electron tube
378 91, 318779, 318802, H01J 3510, H02P 126
Patent
active
061414018
ABSTRACT:
The invention relates to a drive device for a rotary anode of an X-ray tube, including an induction motor (13) whereto an alternating voltage can be applied by means of an inverter (20), and also including a control unit (22) for controlling the inverter (20), the switching frequency of the inverter (20) being variable in time, in conformity with a frequency time characteristic, by means of the control unit (22). It is the object of the invention to provide a drive device for a rotary anode of an X-ray tube as well as a suitable control method which ensures the temperature-independent starting up of the rotary anode. The invention is characterized in that in order to start up the rotary anode to an operating speed independently of the operating temperature of the rotor (12), a fixed, selectable starting up characteristic is provided as the frequency time characteristic, that the starting-up characteristic has at least a low-temperature segment (II) and at least a high-temperature segment (I), the mean slope of the starting up characteristic in the low-temperature segment (II) being optimized for the lower operating temperature range while it is optimized for the upper operating temperature range of the rotor (12) in the high-temperature segment (I).
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Dunn Drew A.
Porta David P.
Renfrew Dwight H.
U.S. Philips Corporation
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