JP2532557Y2 - Ring-shaped permanent magnet with pole identification display - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention has a pole identification display unit for displaying a position for magnetizing the ring-shaped permanent magnet and a pole position of the magnetized ring-shaped permanent magnet. It relates to a ring-shaped permanent magnet.

The present invention also provides a pole identification display unit that can automatically position the ring-shaped permanent magnet using an image processing device when the ring-shaped permanent magnet is magnetized or assembled into an apparatus using an automatic assembling apparatus. The present invention relates to a ring-shaped permanent magnet having:

[Conventional technology]

A conventional example will be described with reference to FIG. FIG. 6 is an explanatory view of a ring-shaped permanent magnet provided with a pole identification display section in a conventional example, wherein (a) is a plan view and (b) is a cross-sectional view. In FIG. 6, the ring-shaped permanent magnet 1 is generally a ferrite permanent magnet or a rare earth permanent magnet. When the ring-shaped permanent magnet is formed by pressing, the pole identification display unit 2 has a concave portion 11 formed on an end surface thereof.

When the ring-shaped permanent magnet 1 is magnetized, or when the magnetized ring-shaped permanent magnet 1 is assembled into, for example, a stepping motor, the concave portion 11 of the pole identification display 2 serves as a reference for positioning.

[Problems to be solved by the invention]

In recent years, for example, ring-shaped permanent magnets for small motors have tended to have more poles in order to increase the control accuracy of a step motor. In addition, there has been an increasing demand for smaller ring-shaped permanent magnets and improved magnetization energy.

Therefore, the pole position magnetized on the ring-shaped permanent magnet is
It must be equally spaced from its central axis. In addition, when the magnetized ring-shaped permanent magnet is incorporated in the stepping motor, the positional relationship between the pole position and the coil is not allowed to shift. Then, the error of this shift needs to be set to a millimeter unit or less.

However, as shown in FIG. 6, if the pole identification display section 2 indicating the magnetized position of the ring-shaped permanent magnet and the position for assembling the ring-shaped permanent magnet is circular, accuracy is lacking in any case.

If a convex groove is provided on the end face of the ring-shaped permanent magnet, it is difficult to form the line width of the convex groove thin. In addition, the convex groove is not assembled correctly due to contact or chipping during the movement of the assembly line or the like due to wear or the like. Further, if the positioning portion provided on the end face of the ring-shaped permanent magnet is linear, positioning is difficult to see.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ring-shaped permanent magnet provided with a pole identification display portion in which the pole position of the ring-shaped permanent magnet is accurate and which is easily visible. I do.

In order to achieve the above object, the ring-shaped permanent magnet having the pole identification display of the present invention has a pole identification display that indicates the position of the magnetized pole, and is multipolar magnetized,
At least one end surface of the ring-shaped permanent magnet, a groove formed by abutting at least two inclined surfaces inclined inward in thickness, formed by the groove, the virtual extension line of the groove And a ridgeline formed so as to pass through the central axis of the ring-shaped permanent magnet.

Further, the ring-shaped permanent magnet provided with the pole identification display portion of the present invention is configured such that at least one end face of the ring-shaped permanent magnet has an intersection formed by the one ridge line and the other at least one ridge line. It is characterized by.

[Action]

Grooves are formed where at least one end face of the ring-shaped permanent magnet comes into contact with an inclined surface formed inwardly of the thickness and the inclined surface. This groove has a thin linear shape when viewed from directly above. Further, the groove is formed by passing a virtual extension line of a line formed by the groove through the center axis of the ring-shaped permanent magnet, thereby assembling the ring-shaped permanent magnet. , And the magnetization position. Further, unlike the simple thin line, the groove is a groove in the depth direction by the inclined surface and the inclined surface.

Also, when the ring-shaped permanent magnet is automatically assembled into a stepper motor or the like, the intersection of the inclined surface provided on at least one end surface of the ring-shaped permanent magnet and the inclined surface is used as a cross point, and the TV camera or the like is used for a CRT. Accurate assembling position and magnetization position can be adjusted while displaying.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view of a ring-shaped permanent magnet provided with a pole identification display unit according to the present invention. FIG. 1 (A) is a plan view, FIG. 1 (B) is a sectional view taken along the line AA ′ of FIG. 1 (A), and FIG. FIG. 3 is an explanatory view of another embodiment of the present invention, wherein (a) is a plan view, (b) is a cross-sectional view, and FIG. 3 is an explanatory view of another embodiment of the present invention.
(A) is a plan view, (B) is a sectional view, FIG. 4 is an explanatory view of another embodiment of the present invention, (A) and (B) are plan views of a pole identification display portion, and FIG. In the state explanatory diagram, (a) shows an inner diameter side magnetized state, and (b) shows an outer diameter side magnetized state.

In the figure, a ring-shaped permanent magnet 1 is made of a ferrite magnet or a rare-earth permanent magnet, and is used for, for example, a step motor. The pole identification display part 2 is formed on the end face when the ring-shaped permanent magnet 1 is created by pressing. The shape of the pole identification display section 2 is the first
As shown in the figures (a) and (b), a truncated quadrangular pyramid is formed in the ring-shaped permanent magnet 1. That is, there are four pyramid surfaces 3 of the quadrangular pyramid and four ridge lines 4 at which the pyramid surfaces 3 abut, and the two opposing ridge lines 4 are arranged in such a direction that the virtual extension line 5 passes through the central axis 6. .

Further, as shown in FIGS. 2 (a) and 2 (b), the shape of the pole identification display portion 2 may be a shape in which a quadrangular pyramid is formed on the end face of the ring-shaped permanent magnet 1. When the vertices of the pyramidal surface 3 are viewed from above, the cross-shaped ridge line becomes the cross point 7. The one ridge line 4 is arranged so that the virtual extension line 5 passes through the center axis 6. Therefore, the cross point 7 serves as a position reference when the ring-shaped permanent magnet 1 is magnetized, and at the same time, can be read by a TV camera, displayed on a CRT, and used for positioning the ring-shaped permanent magnet 1.

Further, as shown in FIGS. 3 (a) and (b), the pole identification display portion 2 is formed by forming an inclined surface 8 and an inclined surface 8 'on the end surface of the ring-shaped permanent magnet 1 in a V-shape. An imaginary extension line 5 of a line forming the ridge line 4 of the character is arranged so as to pass through the central axis 6 of the ring-shaped permanent magnet 1.

Further, the shape of the pole identification display section 2 is shown in FIG.
As shown in (b) and (b), the end face of the ring-shaped permanent magnet 1 is
A truncated triangular pyramid 9 or triangular pyramid 10 is drilled, and a ridge 4 formed by the triangular pyramid is arranged so that its virtual extension line passes through the central axis 6.

The pole identification display portion 2 having such a shape is formed by a not-shown mold or cutting.

FIG. 5 shows an example in which the pole identification display section 2 of the embodiment shown in FIG. 2 is used, and shows the magnetized state on the inner diameter side and the outer diameter side of the ring-shaped permanent magnet 1. The same pole identification display unit 2 can be used for both sides of the magnetization. Then, when assembling the magnetized ring-shaped permanent magnet 1 into, for example, a stepping motor, the ridge line 4 of the pole identification display section 2 is easily visible and easily aligned as a positioning reference.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments. Various design changes can be made without departing from the present invention described in the claims for utility model registration.

For example, the angle of the inclined surface that forms the ridge line can be set arbitrarily. However, if the angle of the inclined surface is sharp, cracks are easily formed in the ring-shaped permanent magnet, which is in proportion to the size of the ring-shaped permanent magnet.

Although FIGS. 1 to 4 show examples based on quadrangular pyramids, grooves or triangular pyramids, the present invention is not limited to this shape, and includes various modifications.

Further, although the pole identification display portion is provided over the entire width of the end face of the ring-shaped permanent magnet, a margin may be provided at the end portion.

[Effect of the invention]

According to the present invention, a virtual extension line of the ridgeline of the pole identification display portion formed of an inclined surface provided inward in the thickness direction on at least one end surface of the ring-shaped permanent magnet passes through the center axis of the ring-shaped permanent magnet. Therefore, the positions magnetized inside or outside the ring-shaped permanent magnet are clearly displayed.
Further, the pole identification display portion is not simply a thin line, but is a line formed three-dimensionally by an inclined surface formed inward in the thickness direction, and is easy to see, unlike a simple thin line.

Also, according to the present invention, since the pole identification display section is provided with a cross point formed by the intersection of the inclined surface provided in the thickness direction and the inclined surface, the ring-shaped permanent magnet is automatically attached to the step motor or the like. When assembling, accurate positioning can be performed while displaying on a CRT with a TV camera or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a ring-shaped permanent magnet provided with a pole identification display unit according to the present invention. FIG. 1 (A) is a plan view, FIG. 1 (B) is a sectional view taken along the line AA 'of FIG. FIG. 5 is a view for explaining another embodiment of the present invention, in which (a) is a plan view, (b) is a sectional view,
Drawings are explanatory views of another embodiment of the present invention, (A) is a plan view, (B) is a sectional view, FIG. 4 is an explanatory view of another embodiment of the present invention, (A) and (B) are FIG. 5 is a diagram illustrating a magnetized state, FIG. 5 (a) shows a magnetized state on the inner diameter side, FIG. 6 (b) shows a magnetized state on the outer diameter side, and FIG. It is a ring-shaped permanent magnet explanatory drawing provided with the display part, (A) is a top view, (B) is a sectional view. DESCRIPTION OF SYMBOLS 1 ... Ring permanent magnet 2 ... Polar identification display part 3 ... Pyramid surface 4 ... Ridge line 5 ... Virtual extension line 6 ... Central axis 7 ... Cross point 8 ... Inclined surface 9 ... Triangular truncation Conical 10 ... Triangular pyramid

Claims (2)

(57) [Scope of request for utility model registration] 1. A multi-pole magnetized ring-shaped permanent magnet having a pole identification display unit for displaying a magnetized pole position, wherein at least one end face of the ring-shaped permanent magnet has a thickness within A groove formed by abutting at least two inclined surfaces inclined in the direction, and a ridgeline formed by the groove and formed so that a virtual extension line of the groove passes through the center axis of the ring-shaped permanent magnet. A ring-shaped permanent magnet provided with a pole identification display portion, comprising: 2. The pole identification display section according to claim 1, wherein an intersection is formed on at least one end face of said ring-shaped permanent magnet from said one ridge line and at least one other ridge line. Ring-shaped permanent magnet with