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Electric machine

A technology of rotating shaft and stator, applied in the direction of electrical components, electromechanical devices, etc., can solve the problems such as the inability to maintain radial bearings and the inability to achieve thinning, and achieve the effect of thinning

Inactive Publication Date: 2007-01-17
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this PM type stepping motor, since the radial bearings 190, 191 are exposed from the stator 130 to the motor axis direction, the size of the motor axis direction of the motor body is at least the size of the stator 130 plus the radial bearings 190, 191, The thickness of 191, there is a problem that thinning cannot be realized
For this reason, if considering the characteristics of the motor, although the plate 180 and the annular member 195 can also be removed, once these members are abolished, the radial bearings 190, 101 cannot be maintained.

Method used

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Embodiment 2

[0045] image 3 A longitudinal sectional view showing a motor according to Embodiment 2 of the present invention.

[0046] Such as image 3 As shown, the stepper motor 1 of this embodiment also includes: a rotor 2 with permanent magnets 22 , a rotating shaft 21 extending from the rotor 2 , and a stator 3 arranged around the rotor 2 . The stator 3 is composed of the first stator group 4 and the second stator group 5 as in the first embodiment. The first stator group 4 is composed of a first outer stator core 41 , a first bobbin 42 around which a coil is wound, and a first inner stator core 43 sandwiching the bobbin 42 with the first outer stator core 41 . constitute. The second stator group 5 is composed of a second outer stator core 51, a second bobbin 52 on which a coil is wound, and the bobbin 52 is sandwiched between the second outer stator core 51 and the second outer stator core. The second inner stator core 53 between 51 constitutes.

[0047] An end plate 60 is atta...

Embodiment 3

[0057] Figure 4 A longitudinal sectional view showing a motor according to Embodiment 3 of the present invention. This embodiment is an example in which the radial bearing portion 7 is formed at the lower end portion of the rotary shaft 21 in the figure.

[0058] Such as Figure 4 As shown, the stepper motor 1 of this embodiment also includes: a rotor 2 with permanent magnets 22 , a rotating shaft 21 extending from the rotor 2 , and a stator 3 arranged around the rotor 2 . The stator 3 is composed of a first stator group 4 and a second stator group 5 . The first stator group 4 is composed of a first outer stator core 41 , a first bobbin 42 around which a coil is wound, and a first inner stator core 43 sandwiching the bobbin 42 with the first outer stator core 41 . constitute. The second stator group 5 includes a second outer stator core 51 , a second bobbin 52 around which a coil is wound, and a second inner stator core 53 sandwiching the bobbin 52 with the second outer s...

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Abstract

In a stepping motor, a central plate part 425 is extended inward from the flange part 423 of a first bobbin 42 and a radial bearing part 7 having a shaft hole 70 for supporting a rotating shaft 21 rotatably is formed at a part 70a projecting toward the rotor 2 side in the center of the central plate part 425. The radial bearing part 7 projects tubularly toward the rotor 2 side and an annular recess 25 receiving the radial bearing part 7 is formed in the rotor 2.

Description

technical field [0001] The present invention relates to a motor in which a stator core is stacked on a bobbin for coil winding, and more particularly to a support structure for a rotary shaft in a motor having such a structure. Background technique [0002] Generally speaking, if Figure 5 As shown in (a), the PM type stepping motor includes: a rotor 120 having a permanent magnet 122 , a rotating shaft 121 extending from the rotor 120 , and a stator 130 disposed around the rotor 120 . [0003] The stator 130 includes a first outer stator core 141 and a first inner stator core 143 arranged to sandwich a first bobbin 142 on which a coil is wound from above and below, and a second bobbin 152 arranged to sandwich a coil from above and below. There are a second inner stator core 153 and a second outer stator core 151 sandwiched by the second bobbin 152 of the coil. Wherein, a plurality of pole teeth respectively formed on the first outer stator core 141 and the first inner stato...

Claims

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Application Information

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IPC IPC(8): H02K37/14
Inventor 务台仁志
Owner SANKYO SEIKI MFG CO LTD