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:
Aug. 11, 2015
Filed:
Nov. 30, 2011
Shingo Hishikawa, Tokyo, JP;
Shingo Hishikawa, Tokyo, JP;
HITACHI MEDICAL CORPORATION, Tokyo, JP;
Abstract
In order to provide an X-ray imaging apparatus including a two-phase anode rotation mechanism driving circuit having a small and light configuration, one end of the main stator coil is connected to a three-phase full-bridge inverter circuit and the midpoint between two semiconductor switches of the first arm, one end of the auxiliary stator coil is connected to the midpoint between two semiconductor switches of the second arm, and the other ends of the main stator coil and the auxiliary stator coil are connected to the midpoint between two semiconductor switches of the third arm. The semiconductor switches are switched using an inverting circuit and a delay circuit so that a first AC voltage is supplied to the one end of the main stator coil and a second AC voltage, which is shifted in phase by 90° from the first AC voltage, is supplied to the one end of the auxiliary stator coil.