The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1984
Filed:
May. 20, 1981
Rudolf Friedel, Kleinseebach, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
In an exemplary embodiment, to reduce wear on the bearings of a rotary anode during radiography processes which require a high load of the tube, such as e.g. all types of series techniques, a control of the rotational frequency of the anode is effected according to which the rotational speed of the anode drive motor is increased as a function of increasing thermal load on the anode plate. For this purpose there takes place, in a static frequency changer, an increase of the frequency of the alternating current with which the motor is driven. The motor drive frequency can, for example, be controlled in dependence upon the temperature of the anode plate as sensed by a measuring probe. An inventive drive of rotary anodes is particularly suited for use in the case of X-ray examination apparatus, especially computer tomographs.