JP3188893U - Coil bobbin and claw pole type stepping motor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil bobbin capable of suppressing vibration or noise to reduce noise. SOLUTION: A bobbin 10 having a cylindrical body portion 11 and a flange portion 12 extending radially at both ends of the body portion 11 and an annular yoke portion 21A abutting on the collar portion 12 of the bobbin 10 , 22A and stator yokes 21 and 22 having polar teeth extending from the inner peripheral edges of the yoke portions 21A and 22A along the inner peripheral surface of the body portion 11 of the bobbin 10 and formed in the circumferential direction of the inner peripheral edge. A coil bobbin 10 for a claw pole type stepping motor, which is formed at a predetermined position at a corner portion which is a continuous portion between the body portion 11 and the flange portion 12 of the bobbin 10 and is provided on the inner peripheral surface side of the body portion 11. A convex protrusion 13 is provided, and the protrusion 13 has a predetermined height exceeding the surface of the collar portion 12. [Selection diagram] Fig. 1

Description

  The present invention relates to a coil bobbin and a claw pole type stepping motor using the same.

  As a coil bobbin used for a claw pole type stepping motor, for example, one described in Patent Document 1 is known.

  The coil bobbin described in Patent Document 1 has a plurality of pole teeth that are part of the stator yoke along the circumferential direction on the inner peripheral surface of the body portion of the bobbin. It is stored in a storage portion defined by a protrusion formed on the inner peripheral surface. The coil bobbin having such a configuration can automatically correct the position of the pole teeth when the stator yoke is attached to the bobbin.

  However, even though the coil bobbin having such a configuration can prevent vibration and noise due to the displacement of the pole teeth, the effect of reducing vibration and noise such as radial vibration due to the repulsion between the pole teeth and the magnet is insufficient. Therefore, it was not sufficient for achieving the noise reduction as a motor.

JP 2003-189484 A

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a coil bobbin that suppresses vibration or noise to achieve noise reduction and a claw pole type stepping motor using the same. .

This invention is grasped | ascertained by the following structures.
(1) A coil bobbin of the present invention includes a bobbin having a cylindrical body part and flanges extending in the radial direction at both ends of the body part, and an annular yoke abutting on the flange part of the bobbin And a stator yoke having a plurality of pole teeth extending from the inner peripheral edge of the yoke part along the inner peripheral surface of the body part of the bobbin and formed in the circumferential direction of the inner peripheral edge. A coil bobbin for a type stepping motor, wherein a projection that is formed at a predetermined position of a corner portion that is a continuous portion of the body portion and the flange portion of the bobbin and is convex on the inner peripheral surface side of the body portion And the protrusion has a predetermined height exceeding the surface of the flange.
(2) In the coil bobbin of the present invention, in the configuration of (1), the protrusion has a circumferential width that can be press-fitted between the roots of the adjacent pole teeth, and the tip of the pole teeth on the opposite side is The axial length is such that it can be pressed.
(3) The coil bobbin of the present invention is characterized in that, in the configuration of (1) or (2), the protrusion has a groove between the extended end and the inner peripheral surface of the body part. To do.
(4) The coil bobbin of the present invention is characterized in that, in the configuration of (1) or (2), the protrusion has a height exceeding the thickness of the yoke portion of the stator yoke.
(5) The coil bobbin of the present invention is characterized in that, in the configuration of (1) or (2), the protrusion is formed by two-color molding, and a resin having a low elastic modulus is used only for the protrusion.
(6) The claw pole type stepping motor of the present invention is characterized in that the coil bobbin according to any one of (1) to (5) is used.

  According to the coil bobbin configured as described above and the claw pole type stepping motor using the coil bobbin, vibration or noise can be suppressed and noise reduction can be achieved.

(A) is a perspective view which shows the coil bobbin of this invention, (b) is sectional drawing in the bb line of (a). It is a perspective view which shows the state which attached the stator yoke to the coil bobbin. It is sectional drawing of a coil bobbin. It is sectional drawing of the state which attached the stator yoke to the coil bobbin. It is the graph which showed the effect of the coil bobbin of this invention compared with the conventional example.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
(Embodiment 1)
FIG. 1A is a perspective view showing a coil bobbin of the present invention. FIG. 1B is a cross-sectional view taken along line bb in FIG.

  The coil bobbin 10 includes a cylindrical body portion 11 and a pair of flange portions 12 extending in the radial direction from both ends of the body portion 11. Note that a coil (not shown) is wound around the outer peripheral surface of the body portion 11 between the flange portions 12. A plurality (12 in the figure) of protrusions 13 are formed at equal intervals along the circumferential direction on the inner peripheral portion of each collar portion 12. Such a protrusion 13 is formed at a corner portion that is a continuous portion of the body portion 11 and the flange portion 12 of the coil bobbin 10 and is formed to be convex on the inner peripheral surface side of the body portion 11. Each protrusion 13 is erected on the outside of each flange 12 with a predetermined height H exceeding the surface of each flange 12, and has a thickness T that protrudes in the radial direction from the inner peripheral surface 11 </ b> A of the body 11. It is formed.

The height H of the protrusion is slightly higher than the thickness t of the stator yoke (indicated by reference numerals 21 and 22 in FIG. 1B) disposed on the coil bobbin 10 (H> t). In other words, even when the stator yokes 21 and 22 are arranged on the coil bobbin 10, the protrusion 13 protrudes slightly (for example, by h) from the surface of the stator yokes 21 and 22. In addition, the other end (inner end) in the direction opposite to the predetermined height H is in contact (pressure contact) with the tips of the pole teeth of the opposing stator yokes 21 and 22, so that the dimension L is in a range where pressure contact is possible. Yes.
Each protrusion 13 formed on one flange 12 is formed at a position shifted by a half pitch in the circumferential direction with respect to each protrusion 13 formed on the other flange 12A.

  Each projection 13 is formed with a groove 17 having an inner wall that is flush with the inner peripheral surface 11A at the end (extending end) of the body portion 11 on the inner peripheral surface 11A side. . The groove 17 is formed from one side of the protrusion to the other side along the circumferential direction of the body portion 11.

  3 is a cross-sectional view taken along line III-III in FIG.

  FIG. 2 is a perspective view showing the stator assembly 20. The stator assembly 20 is formed by fitting the stator yokes 21 and 22 from the flange 12 sides at both ends of the coil bobbin 10 after winding the coil bobbin 10 shown in FIG.

  The stator yoke 21 includes an annular part (yoke part) 21A and a plurality (12 in the figure) of pole teeth 21B extending along the axial direction (lower side in the figure) from the inner periphery of the annular part 21A. Has to have.

  The annular portion 21A is formed so as to be superimposed on the flange portion 12 of the coil bobbin 10, and each pole tooth 21B is formed so that the protrusion 13 is fitted between the other adjacent pole teeth 21B. ing. In other words, the protrusion 13 of the coil bobbin 10 is formed with a width in the circumferential direction set so as to allow press-fitting. Each pole tooth 21B has a substantially triangular shape with a large width at the root connected to the annular portion 21A and a small width at the tip. The tip of each pole tooth 21 </ b> B comes into contact (pressure contact) with the protrusion 13 on the other flange 12 </ b> A side of the coil bobbin 10.

  The other stator yoke 22 has substantially the same shape as the stator yoke 21 described above, and is formed along an annular portion 22A (not shown) and the inner periphery of the annular portion 22A in the axial direction (upper side in the drawing). Although it has a plurality of (12 in the figure) pole teeth 22B extending, in the present embodiment, it further extends along the axial direction (upper side in the figure) from the outer periphery of the annular portion 22A. A cylindrical portion (frame yoke) 22C is included.

  The annular portion 22A is formed so as to overlap with the flange 12A (not shown) of the coil bobbin 10, and each pole tooth 22B has a protrusion 13 fitted between the other adjacent pole teeth 22B. It is formed to be. In other words, the protrusion 13 of the coil bobbin 10 is formed with a width in the circumferential direction set so as to allow press-fitting. Each pole tooth 22B has a substantially triangular shape with a large width at the root connected to the annular portion 22A and a small width at the tip. The tip of each pole tooth 22 </ b> B comes into contact (pressure contact) with the protrusion 13 of one flange 12 of the coil bobbin 10.

  In the stator assembly 20 thus formed, the pole teeth 21B and 22B of the stator yokes 21 and 22 are divided into a total of three by the projections 13 arranged on both sides of the root and the other projections 13 with which the tips abut. It is designed to be fixed in place. For this reason, each stator yoke 21 and 22 can be attached to the coil bobbin 10 without rattling.

  In addition, the coil bobbin 10 has a structure in which the protrusion 13 protrudes by h with respect to the annular portions 21A and 22A of the stator yoke. It has a function of absorbing and adjusting a slight gap. Such a protruding structure of protrusions has a function of absorbing and adjusting the gap even when the two stator assemblies 20 are back to back.

  As shown in FIG. 4, a gap is formed between each pole tooth 21 </ b> B of one stator yoke 21 and each pole tooth 22 </ b> B of the other stator yoke 22, and the inner peripheral surface 11 </ b> A of the coil bobbin 10 is formed from this gap. A part of is exposed.

  4 is a cross-sectional view taken along line IV-IV in FIG.

As is clear from the above description, the features of the present invention can be summarized as follows.
(A) The protrusion 13 formed at the base of the flange portion 12 of the inner peripheral surface 11A of the coil bobbin 10 fits in the space between the roots of the pole teeth 21B on one side without any gap, and the other side pole It has a structure in which the tips of the teeth 22B abut against each other without a gap.
(B) The protrusion 13 slightly protrudes from the surfaces of the annular portions 21A and 22A of the stator yokes 21 and 22 in a state after being abutted (see FIG. 1B), and is opposed to another part (not shown) (for example, , A housing, a flange, the other yoke, etc.).
(C) It is conceivable to adhere the back surfaces of the pole teeth 21B and 22B to the inner peripheral surface 11A of the body portion 11 as a means for improving the quietness, but the protrusion 13 has an adhesive receiving groove 17. In addition, since this groove | channel 17 also has the function to improve the bending of the processus | protrusion 13, when the front-end | tip of a pole tooth is made to contact | abut (press-contact) to the processus | protrusion 13, the function can be exhibited.

  For this reason, the present invention does not hold down the entire surfaces of the pole teeth 21B and 22B, but supports and fixes the three points on both sides of the roots of the pole teeth 21B and 22B and the tips of the pole teeth 21B and 22B (vibration). ).

  FIG. 5 is a graph showing the effect of the coil bobbin of the present invention in comparison with the conventional example. The graph is a comparison diagram of amplitude (mm) in the “bending mode” that is a noise source. In the graph, A indicates the amplitude for the configuration of the present invention, B indicates the amplitude for the configuration shown in Patent Document 1 described above, and C indicates the amplitude for a configuration in which no measures are taken against vibration. As is clear from the graph, in the case of the configuration shown in Patent Document 1, the amplitude is 0.0135 mm, whereas in the case of the configuration of the present invention, the amplitude is 0.0062 mm. As compared with the configuration shown in Patent Document 1, the configuration of the present invention is 46%, which is a reduction of 54%.

(Embodiment 2)
In the first embodiment, each of the protrusions 13 of the coil bobbin 10 is formed so as to protrude by a height h relative to the stator yokes 21 and 22 (see FIG. 1B). 13 may be applied only to the protrusion 13 formed on the side of one of the flanges 12 of the coil bobbin 10.

(Embodiment 3)
In the embodiment described above, the groove 17 is provided between the end portion of the protrusion 13 and the inner peripheral surface 11 </ b> A of the body portion 11. However, the groove 17 may not be provided.

(Embodiment 4)
In the embodiment described above, the coil bobbin 10 is formed of a single resin material. However, the projection 13 may be formed by two-color molding using a resin material having a low elastic modulus. Since the flexibility is increased by the resin material having a low elastic modulus of two-color molding, the amount of dimensional variation absorbed can be improved, the dimensional accuracy of the pole teeth 21B, 22B, etc. can be roughened, and cost reduction can be expected. Further, by using a resin material having a low elastic modulus, the vibration absorbing power is increased, and the vibration can be reduced and noise reduction can be expected.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. In addition, it is apparent from the description of the claims of the utility model registration that embodiments with such changes or improvements can be included in the technical scope of the present invention.

10 bobbins (coil bobbins)
11 trunk part 11A inner peripheral surface 12 collar part (one collar part)
12A buttock (the other buttock)
13 Protrusion 17 Groove 20 Stator assembly 21 Stator yoke (one stator yoke)
21A ring part (yoke part)
21B pole teeth (pole teeth on one side)
22 Stator yoke (the other stator yoke)
22A Ring part (yoke part)
22B pole teeth (pole teeth on the other side)
22C Cylindrical part (frame yoke)

Claims (6)

A bobbin having a cylindrical body part and a flange part extending radially at both ends of the body part;
An annular yoke portion that is in contact with the flange portion of the bobbin and a plurality of inner yokes extending along the inner peripheral surface of the body portion of the bobbin in the circumferential direction of the inner periphery. A coil bobbin for a claw pole type stepping motor comprising a stator yoke having pole teeth.
Protruding projections are provided on the inner peripheral surface side of the body portion, which are formed at predetermined positions of corner portions that are continuous portions of the body portion and the flange portion of the bobbin, and the protrusion is a surface of the flange portion. A coil bobbin having a predetermined height exceeding.   The protrusion has a circumferential width capable of being press-fitted between the bases of the adjacent pole teeth, and has an axial length such that a tip of the pole tooth on the opposite side is press-contacted. The coil bobbin according to claim 1.   The coil bobbin according to claim 1, wherein the protrusion has a groove between the extension end and the inner peripheral surface of the body portion.   The coil bobbin according to claim 1 or 2, wherein the protrusion has a height exceeding a thickness of the yoke portion of the stator yoke.   The coil bobbin according to claim 1 or 2, wherein the protrusion is formed by two-color molding, and a resin having a low elastic modulus is used only for the protrusion. A claw-pole type stepping motor using the coil bobbin according to any one of claims 1 to 5.

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