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Permanent magnet type motor and x-ray computed tomography apparatus

a permanent magnet type, computed topography technology, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/form/construction, application, etc., can solve the problems of large x-ray ct apparatus, target requires a mount space and parts, and the cost of assembly is high, and the cost reduction of x-ray ct apparatus is not enough

Inactive Publication Date: 2007-07-05
YOKOYAMA AKIYUKI +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution results in a more compact X-ray CT apparatus with reduced inertial moment, weight, and volume, achieving cost savings while maintaining precision in position detection, and allowing for easier maintenance and adjustment.

Problems solved by technology

Thus, there has been a problem that the whole X-ray CT apparatus is large sized.
Moreover, the fact that the whole X-ray CT apparatus is large sized causes a problem with respect to the cost reduction of the X-ray CT apparatus.
In this way, a detection target of the magnet type encoder is provided other than the electric motor body, and thus, has a defect that the target requires a mount space and parts and assembly cost.
However, the resolver is high in cost from a structural aspect.

Method used

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  • Permanent magnet type motor and x-ray computed tomography apparatus
  • Permanent magnet type motor and x-ray computed tomography apparatus
  • Permanent magnet type motor and x-ray computed tomography apparatus

Examples

Experimental program
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first embodiment

[0044] Now, some embodiments of a permanent magnet type motor according to the present invention other than that shown in FIG. 2 will be described with reference to FIGS. 3A to 10B. FIG. 3A shows a motor layout view and FIG. 3B shows a sectional view taken along the line O-A of FIG. 3A and seen in a direction indicated by the arrows, the views each illustrating the permanent magnet type motor according to the present invention.

[0045] This configuration comprises a ring shaped rotor main body or a rotor yoke 30 rotatably supported by a bearing which is fixed at a stationary frame 6A via a link member (not shown); a plurality of permanent magnets 31 provided on the outer periphery of the rotor main body 30, the magnets 31 having alternately arranged S poles and N poles so that one end part protrudes in an axial direction from the surface of the rotor main body 30, and that the S and N poles are arranged so as to be periodic (equal in interval) in the circular direction; a stator core ...

second embodiment

[0050]FIG. 4A shows another motor layout view illustrating a permanent magnet type motor and FIG. 4B shows a sectional view taken along the line O-A of FIG. 4A and seen in a direction indicated by the arrows. A difference from FIGS. 3A and 3B is that a magnetic sensor 36 is provided in a radial direction of the detection target portion 35, so that the detection target portion 35 is at an end face part of a rotator main body 30. The other configuration is identical to that of FIGS. 3A and 3B and a detailed description thereof may be omitted.

third embodiment

[0051]FIG. 5A shows still another motor layout view illustrating a permanent magnet type motor and FIG. 5B shows a sectional view taken along the line O-A and seen in a direction indicated by the arrows. A difference from FIGS. 4A and 4B is that an irregular portion is not formed as a detection target portion 35 of a rotor main body 30, and instead a plurality of holes 37 are formed periodically (with equal intervals) in a peripheral direction at the inner periphery face side of the rotor main body 30. The other configuration is identical to that of FIGS. 4A and 4B.

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Abstract

A permanent magnet type motor comprising a rotor main body rotatably supported with respect to a stationary member, a rotor which is provided on an outer periphery face of the rotor main body and which is arranged such that S poles and N poles of a plurality of permanent magnets are provided alternately, a stator composed of a stator core arranged at the outer periphery side or inner periphery side of the rotor, the stator core having winding storage sections, and stator windings stored in the winding storage sections, a sensor fixed to the stationary member so as to be proximal to the permanent magnets, the sensor detecting a position of the permanent magnets, a detection target member having a detector for detecting a magnetic resistance change portion formed on the rotor main body, and a rotational position detecting magnetic sensor arranged at the stationary member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a division of and claims the benefit of priority under 35 U.S.C. §120 from U.S. Ser. No. 10 / 845,114, filed May 14, 2004, and claims the benefit of priority under 35 U.S.C. §119 from prior Japanese Patent Application No. 2003-139073, filed May 16, 2003. The entire contents of these applications are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a permanent magnet type motor and an X-ray computed topography (hereinafter, referred to as X-ray CT) apparatus. [0004] 2. Description of the Related Art [0005] Conventionally, it has been well known that an example of X-ray CT apparatus is configure as shown in FIG. 11 which is a partial sectional view showing essential portions thereof. The conventional X-ray CT apparatus comprises: a stationary tubular frame 51 having a small diameter portion and a large diameter portion to form a substant...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J35/00A61B6/03A61B6/00H02K1/27H02K7/14H02K11/00H02K21/14H02K29/08H02K29/10
CPCH02K7/14A61B6/56
Inventor YOKOYAMA, AKIYUKIKURODA, MASAHIRONAKAYAMA, TADAHIROKOMINATO, SHINICHIHARADA, TOMOKAZUSAITO, YOSHINORI
Owner YOKOYAMA AKIYUKI
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