Contactless power transfer system for a rotational load

Details Contactless power transfer system for a rotational load Contactless power transfer system for a rotational load

1995-10-23

1997-03-04

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

A61B 603

Patent

active

056087713

ABSTRACT:
Power is transferred from a stationary power supply to a rotational gantry in a computer tomography (CT) system through a rotary transformer arranged in a ring configuration with an inner diameter that is sufficiently large to receive a patient. The rotary transformer has a toroidal rotor core and a toroidal stator core arranged either concentrically with an air gap extending radially therebetween or side-by-side with an air gap extending axially therebetween. A resonant inverter provides ac power to the rotary transformer which, in turn, drives a high-voltage tank circuit coupled to a x-ray tube, the tank circuit and x-ray tube being mounted on a rotational gantry. Advantageously, this is a contactless power transfer system which eliminates conventional brush and slip ring arrangements and moreover avoids the need for mounting the inverter to rotate with the CT gantry.

REFERENCES:
patent: 4323781 (1982-04-01), Baumann et al.
patent: 4912735 (1990-03-01), Beer
patent: 5347256 (1994-09-01), Yumiki et al.

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