JP4258277B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor, and more particularly to a motor that can effectively prevent coil displacement.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is known that a deflection preventing rib is disposed in a wiring guide wall of an insulating frame in a deflection yoke (see, for example, Patent Document 1). This Patent Document 1 describes that the sag prevention rib can prevent the coil from sagging during winding work and eliminate the disconnection.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-185664
[Problems to be solved by the invention]
However, even if the coil is wound around the winding part of the motor without slack, the inertial force that acts on the coil during the subsequent assembly of the motor, the assembly of the part incorporating the motor, or the use In some cases, the coil shifts from the predetermined position. That is, even when the coil sagging is prevented during the winding process, the coil sagging or disconnection may occur in the subsequent process due to the coil deviation.
[0005]
Therefore, an object of the present invention is to provide a motor capable of preventing the occurrence of coil deviation.
[0006]
[Means for Solving the Problems]
The object is a motor comprising a winding portion having a circular circumferential surface around which a winding is wound in a circumferential direction, as described in claim 1,
Two protrusions for preventing displacement of the winding in the circumferential direction are formed on the circumferential surface of the winding portion so as to protrude radially outward from the circumferential surface, and are formed at two symmetrical positions with respect to the motor rotation axis. and said that you are, made us Ri by the motor.
[0007]
According to the present invention, also the inertia force of the winding time or use or the like assembled circumferentially in a case where applied, the circumferential direction of the displacement of the winding due to the protrusion (i.e., the rotation of the coil) Therefore, the winding is prevented from deviating from a predetermined position, and the slack and disconnection of the winding can be prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1A is a front view schematically showing an embodiment of a motor 10 according to the present invention. The motor 10 of this embodiment is a claw pole type stepping motor. The motor 10 includes a substantially cylindrical stator 12. A through hole 14 (see FIG. 1B) through which a rotor (not shown) is inserted is formed at the center of the stator 12. A concave portion 20 that opens radially outward is formed in the outer circumferential portion of the stator 12 over the entire circumferential direction. The recess 20 is formed in two places in the axial direction. A winding (magnet wire) is wound around the recess 20 along the circumferential direction with the terminal 17 as an end. Therefore, the stator 12 is formed with two layers of ring-shaped coils 16. Hereinafter, the concave portion 20 is referred to as a “winding portion 20”.
[0010]
A plurality of claw portions 18 (claw poles (dielectrics)) are embedded inside the winding portion 20 so as to mesh with each other in the vertical direction, as indicated by broken lines in FIG. The plurality of claw portions 18 are made of metal. The stator 12 is formed by injecting resin in a state where a sheet metal having a plurality of claw portions 18 is set in a mold (insert molding). Therefore, the surface (in particular, the peripheral surface 22) of the winding part 20 is made of resin.
[0011]
FIG. 1B is a cross-sectional view of the stator 12 taken along line AA in FIG. As shown in FIG. 1B, the winding portion 20 has a circular peripheral surface 22. Protrusions 24 (ribs) projecting radially outward are formed on the peripheral surface 22 of the winding portion 20 of the present embodiment. The protrusions 24 are formed on both of the two layers of the winding portion 20. The protrusions 24 may be formed at a plurality of locations (two locations in the example shown in FIG. 1B) at predetermined intervals along the circumferential direction of the peripheral surface 22. The protrusion 24 functions to prevent coil displacement as will be described later. The height of the protrusion 24 is set to about 0.5 mm, for example. Further, the protrusion 24 may be formed in the winding portion 20 over the entire axial direction. The protrusion 24 may be integrally formed with the stator 12 or may be formed of another material (for example, rubber) having a large sliding resistance and fixed to the peripheral surface 22 of the winding portion 20. Also good.
[0012]
FIG. 2A is a diagram showing a shock absorber in which the motor 10 of this embodiment is incorporated, and FIG. 2B is a diagram showing the motor 10 incorporated in the shock absorber. As shown in FIG. 2, the motor 10 of this embodiment is assembled to the lower end portion of the rod 32 of the shock absorber 30. In this assembled state, the rotation of the motor 10 is restricted with respect to the rod 32. That is, the stator 12 of the motor 10 is configured to rotate together with the rod 32. The motor 10 functions to change the damping area of the shock absorber 30 by changing the area of the orifice stepwise. The present invention does not particularly specify the configuration of the shock absorber, and can be applied to any shock absorber regardless of whether it is a hydraulic type or an air type as long as it has a built-in motor.
[0013]
FIG. 3 is a view for explaining the work of assembling the shock absorber 30 incorporating the motor 10 of this embodiment to the vehicle. As usual, the shock absorber 30 has one end attached to the vehicle body and the other end attached to a suspension arm or the like. In this embodiment, the upper end of the shock absorber 30 is coupled to the vehicle body (body panel) with a nut as shown in the right side of FIG. 3 (corresponding to an enlarged view of the portion X). The terminal 17 of the motor 10 is electrically connected to the vehicle body side via a wire harness 40 and a connector 42 (see FIG. 2).
[0014]
By the way, when the nut is tightened, the rod 32 of the shock absorber 30 rotates together. Therefore, when the nut tightening is started or completed, the inertia force acts on the coil 16 of the stator 12 due to the start or sudden stop of the rotation of the rod 32 of the shock absorber 30. When the coil 16 rotates in the circumferential direction due to this inertial force, a coil shift that displaces in the circumferential direction with respect to the winding portion 20 of the coil 16 occurs, causing slack or disconnection of the windings constituting the coil 16. There is.
[0015]
On the other hand, according to the present embodiment, the protrusion 24 is provided on the winding portion 20 of the stator 12 as described above. Therefore, according to the present embodiment, even when an inertial force is applied to the coil 16, the rotation of the coil 16 is prevented by the protrusion 24, and the coil shift can be prevented.
[0016]
Next, an alternative embodiment as a reference example not belonging to the scope of the present invention will be described with reference to FIG. FIG. 4A is a diagram showing a first alternative embodiment, and is a cross-sectional view of the stator 12 taken along line AA in FIG. In this embodiment, as shown in FIG. 4A, the winding portion 20 of the stator 12 has an elliptical peripheral surface 22 instead of a circle (indicated by a broken line) as in the above-described embodiment. Yes. Therefore, in this embodiment, the elliptical shape of the peripheral surface 22 functions as a resistor that prevents the coil 16 from rotating, instead of the protrusion 24 of the above-described embodiment.
[0017]
FIG. 4B is a view showing a second alternative embodiment, and is a cross-sectional view of the stator 12 taken along line AA in FIG. In this embodiment, as shown in FIG. 4A, the winding portion 20 of the stator 12 is not a circle (indicated by a broken line) as in the above embodiment, but a polygon (in this example, an octagon). A peripheral surface 22 is provided. Therefore, in this embodiment, instead of the protrusion 24 of the above-described embodiment, each corner of the polygonal surface 22 functions as a resistor that prevents the coil 16 from rotating.
[0018]
FIG. 4C is a view showing a third alternative embodiment and is a front view of the stator 12. In the present embodiment, the surface 22 of the winding portion 20 of the stator 12 is subjected to a satin treatment (texture or blast treatment) to form minute irregularities 23. The minute irregularities 23 may be formed over substantially the entire circumference of the circumferential surface 22 of the winding part 20 or may be locally formed on the circumferential surface 22 of the winding part 20. In the present embodiment, the circumferential surface 22 of the winding portion 20 of the stator 12 may be circular, elliptical, polygonal, or a combination thereof. In this embodiment, instead of the protrusion 24 of the above-described embodiment, the surface roughness (small unevenness 23) of the peripheral surface 22 functions as a resistance that prevents the coil 16 from rotating.
[0019]
According to each of the above embodiments, as described above, when the inertial force acts on the coil 16 at the time of assembly or the like by providing the peripheral surface 22 of the winding portion 20 with the resistance function for preventing the rotation of the coil 16. Even so, since the rotation of the coil 16 is prevented, sagging or disconnection of the winding wire constituting the coil 16 can be prevented. Therefore, according to each embodiment, coil winding can be prevented without increasing the tension when winding the winding, and both sides of the circumferential surface 22 of the winding part 20 can be prevented in order to prevent coil shifting. There is no need to provide tape or adhesive.
[0020]
The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.
[0021]
For example, the embodiment described above relates to the motor 10 built in the shock absorber 30, but the present invention also applies to a motor built in a component other than the shock absorber 30 and a motor not built in the component. As long as the inertial force in the circumferential direction can act on the coil 16 at the time of assembly or use, it can be effectively applied.
[0022]
In the above-described embodiments, the present invention relates to a claw pole type stepping motor. However, the present invention can be applied to other types of motors as long as a coil wound in the circumferential direction is provided. . Further, the present invention does not particularly specify how to wind the coil, and the coil may be wound by bifilar winding, monofilar winding, or the like as long as it is wound in the circumferential direction.
[0023]
【The invention's effect】
Since the present invention is as described above, the following effects can be obtained. Even when a circumferential inertia force is applied to the coil during assembly or use, the coil is prevented from being displaced in the circumferential direction, so that the coil can be prevented from sagging or broken.
[Brief description of the drawings]
FIG. 1 (A) is a front view schematically showing an embodiment of a motor 10 according to the present invention, and FIG. 1 (B) is taken along line AA in FIG. 1 (A). It is sectional drawing of the stator 12 at the time of cut | disconnecting.
FIG. 2A is a diagram showing a shock absorber in which the motor 10 of this embodiment is incorporated, and FIG. 2B is a diagram showing the motor 10 incorporated in the shock absorber.
FIG. 3 is an explanatory diagram of the work of assembling the shock absorber 30 incorporating the motor 10 of this embodiment to a vehicle.
FIG. 4 illustrates an alternative embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Motor 12 Stator 16 Coil 20 Winding part 22 Circumferential surface 23 Concavity and convexity 24 Protrusion 30 Shock absorber

Claims (1)

A motor comprising a winding portion having a circular circumferential surface around which a winding is wound in the circumferential direction,
Two protrusions for preventing displacement of the winding in the circumferential direction are formed on the circumferential surface of the winding portion so as to protrude radially outward from the circumferential surface, and are formed at two symmetrical positions with respect to the motor rotation axis. A motor, characterized by

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