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Stepping motor and drive device

A technology of stepping motors and magnets, applied in the direction of motor generator control, electromechanical devices, electrical components, etc., can solve problems such as difficult construction

Inactive Publication Date: 2009-01-07
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, put Figure 17 When the structure is used for a 2-phase small cylindrical motor such as the stepping motor shown in Fig. 16, since the two coils are arranged at coaxially separated positions in Fig. Figure 17 FPC is placed in the same structure, and there is difficulty in the structure

Method used

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  • Stepping motor and drive device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] figure 1 , 2 3A to 3H are diagrams of Embodiment 1 of the present invention. in, figure 1 It is an exploded perspective view of a stepping motor. figure 2 yes figure 1 Axial cross-sectional view of the stepper motor shown after assembly.

[0063] exist figure 1 and figure 2 Among them, 1 is a cylindrical magnet whose outer peripheral surface is divided into n parts along the circumferential direction (n=10 in this embodiment 1), and these parts are alternately magnetized into S poles and N poles. 2 is the first stator made of soft magnetic material, which is composed of an outer cylinder and an annular top plate 2f with a hole 2g opened in the center. The outer cylinder of the first stator 2 is formed with first outer magnetic pole portions 2a, 2b, 2c, 2d, and 2e protruding in the axial direction at the front end thereof, and the distance between the first outer magnetic pole portions 2a to 2e in the circumferential direction is It is 720 / n degrees (72 degre...

Embodiment 2

[0086] Figure 4~7 and Figures 8A-8D It is a figure which shows Example 2 of this invention. in, Figure 4 It is an exploded perspective view of the stepping motor of the second embodiment. Figure 5 yes Figure 4 Axial cross-sectional view of the stepper motor shown after assembly. Figure 6A , 6B yes Figure 4 The structural diagram showing the details of the constituent parts of the stepping motor, that is, the coil bobbin. Figure 7 yes Figure 5 7-7 section view in.

[0087] In these figures, 11 is a cylindrical magnet, and its outer peripheral surface is divided into integer multiples of 4 at intervals along the circumferential direction, that is, 4×n (n is an integer, and n=4 in the present embodiment 2, so the number of divisions is 16) parts, these parts are alternately excited as S pole and N pole. 14 is a cylindrical first coil, and 15 is a cylindrical second coil. The two coils 14 and 15 have their centers aligned with the center of the magnet 11, and ar...

Embodiment 3

[0114] Figure 9 It is an exploded perspective view showing a stepping motor as a driving device according to an embodiment of the present invention. Figure 10 It is a plan view showing an FPC incorporating a stepping motor. Figure 11 It is a cross-sectional view along the rotation axis of the assembled stepping motor.

[0115] Figure 9 to Figure 11 Among them, the stepping motor has a magnet 21, a first stator 22, a second stator 23, a first coil 24, a second coil 25, a rotating shaft 26, a first bearing 27, a second bearing 28, a first bobbin 29, a first 2 coil bobbin 30, FPC31.

[0116] The magnet 21 is cylindrical and has a magnetized portion. The magnetized portion divides the outer peripheral surface of the magnet 21 into N (10 in this embodiment) parts in the circumferential direction, and each part is alternately magnetized into S poles and N poles. Extremely made.

[0117] The first stator 22 is made of a soft magnetic material, and has an outer cylinder porti...

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Abstract

The present invention provided a stepping motor which can improve an accuracy by performing the positioning match of the first and second stators in a circumferential direction by one part. The stepping motor includes first and second coils 4, 5 disposed at positions concentric with a magnet 1 and sandwiching the magnet from both axial ends, cylindrical first and second stators 2, 3 having tooth shape poles 2a-2e, 3a-3e extended axially and opposed to the magnet, and a cylindrical bobbin 9 made of an insulator wound with the first coil and the second coil. The bobbin 9 has engaging parts 9d, 9e engaged with the poles extended axially so that the relative positions of the first stator and the second stator in the circumferential direction become a predetermined positional relationship.

Description

Background of the invention [0001] The present invention relates to a stepping motor used as a device driving source and a driving device for the stepping motor. Background technique [0002] Japanese Patent Application Laid-Open No. 2003-9497 discloses an ultra-small stepping motor in which phase alignment of the stator is performed using a bobbin terminal board. FIG. 14 shows an exploded perspective view of the stepping motor. [0003] In Fig. 14, 111 is a magnet magnetized by multi-poles in the circumferential direction, 112 is a shaft, and they constitute the rotor 110. Two sets of stators 120 of the same shape that face the rotor 110 are arranged on the shaft of the magnet 111 oppositely. to both ends. The stator 120 is composed of an inner yoke 121 , a bobbin 122 , an outer yoke 123 , and a cylindrical member 124 . The inner diameter sides of the inner yoke 121 and the outer yoke 123 are magnetically and mechanically connected to the cylindrical member 124 . The bo...

Claims

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Application Information

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IPC IPC(8): H02K37/12H02P8/00H02K37/14
Inventor 堀池香织
Owner CANON KK
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