JP7613306B2 - Magnet insertion tool - Google Patents

Description

This disclosure relates to a magnet insertion tool for inserting magnets toward the magnet arrangement surface of a rotor core and arranging the magnets on the magnet arrangement surface.

Patent document 1 discloses that when adhering a magnet to a rotor yoke, adhesive is injected into the adhesive layer that adheres the yoke and magnet through an adhesive injection through hole provided in the yoke. In this case, even if the adhesive in the adhesive layer is dragged by the insertion of the magnet, the amount of adhesive is prevented from running short by injecting the adhesive.

JP 2005-304287 A

However, in the above conventional technology, the cost of the yoke increases compared to a yoke without a through hole, leading to an increase in the cost of the rotor. In addition, a large amount of adhesive is used, leading to an increase in the cost of the rotor. Furthermore, in the area where the through hole is present, the magnetic path of the magnetic flux passing through the yoke is lost, so the generated magnetic field strength is weaker compared to a yoke without a through hole, leading to a decrease in rotor performance.

Therefore, there is a need for technology that can ensure the adhesion area between the rotor core (yoke) and the magnet without increasing the cost of the rotor or reducing its performance.

The present disclosure can be realized in the following forms.
According to one aspect of the present disclosure, there is provided a magnet insertion tool for arranging magnets on a magnet arrangement surface of a rotor core, the magnet insertion tool including guide parts on both sides that support both ends of the magnet in a width direction corresponding to a circumferential direction of the rotor core so as to be movable in a central axial direction of the rotor core toward the magnet arrangement surface, and a support member provided on only one of the guide parts on both sides, the support member having a tapered end on the magnet arrangement surface side that decreases in height toward the magnet arrangement surface.
The present disclosure can also be realized in the following forms.

According to one aspect of the present disclosure, there is provided a magnet insertion tool for arranging magnets on a magnet arrangement surface of a rotor core, the magnet insertion tool including guide parts on both sides that support both ends of the magnet in a width direction corresponding to a circumferential direction of the rotor core so as to be movable in a central axial direction of the rotor core toward the magnet arrangement surface, and a support member provided on one of the guide parts, the support member having a tapered end on the magnet arrangement surface side that decreases in height toward the magnet arrangement surface.
With this type of magnet insertion tool, one end of the magnet can be kept out of contact with the magnet arrangement surface until just before the magnet is moved along the central axis of the rotor core onto the magnet arrangement surface of the rotor core. This prevents the adhesive applied to the magnet arrangement surface from being dragged by the insertion of the magnet, and prevents a shortage of adhesive. In addition, since there is no need to change the rotor structure as in the prior art, there is no increase in rotor costs or deterioration in performance.

1 is a perspective view showing a schematic configuration of a magnet insertion jig according to one embodiment; FIG. 2 is an explanatory diagram showing an overview of magnet insertion performed by a magnet insertion jig. FIG. 2 is an enlarged perspective view of the magnet guide portion of FIG. 1 . 13 is a side view showing the state when looking from the left guide portion to the right guide portion. FIG. 13 is a front view showing the guide portion on which the magnet is placed as viewed from the front side. FIG. FIG. 2 is an enlarged perspective view of the magnet feeder of FIG. 1 . 11 is an explanatory diagram showing a state in which a magnet is in the middle of moving onto a magnet arrangement surface. FIG.

A. First embodiment:
Fig. 1 is a perspective view showing a schematic configuration of a magnet insertion jig 10 according to one embodiment. In Fig. 1, x, y, and z indicate three mutually orthogonal directions. The z direction corresponds to the up-down direction of the magnet insertion jig 10, the x direction corresponds to the left-right direction of the magnet insertion jig 10, and the y direction corresponds to the front-rear direction of the magnet insertion jig 10 along a central axis Xc, which will be described later. The relationships between x, y, and z are the same in each of the subsequent figures.

Figure 2 is an explanatory diagram showing an overview of magnet insertion performed by the magnet insertion jig 10. As described below, the magnet insertion jig 10 is a jig for moving the magnet 30 along the direction of the central axis of the rotor core 20 (y direction) toward the magnet arrangement surface 204 of the rotor core 20 and placing it on the magnet arrangement surface 204. The rotor core 20 has multiple magnet arrangement surfaces 204 along the circumferential direction on its inner surface (see Figure 1). Each magnet arrangement surface 204 is divided by a rib 202. An adhesive groove 206 filled with adhesive Ead is provided in the circumferential center of each magnet arrangement surface 204.

As shown in FIG. 1, the magnet insertion jig 10 includes a base 110, a magnet guide section 120, a magnet feed section 130, and a rotor core installation section 140. The magnet guide section 120, the magnet feed section 130, and the rotor core installation section 140 are each provided on the base 110.

The rotor core installation section 140 is installed on the rear side of the base 110 in the front-rear direction (y direction) of the jig. The rotor core installation section 140 includes a support 142 and a rotor core installation body 144. The support 142 is a columnar body extending upward (+z direction) from the base 110. The support 142 supports the rotor core installation body 144 so that it can rotate around the central axis Xc along the y direction. When viewed from the front side of the magnet insertion jig 10 in the front-rear direction along the -y direction, the rotor core installation body 144 has a disk shape centered on the central axis Xc, and has a rib 145 provided in an annular shape along the outer peripheral edge of the disk shape. The inner wall surface of the rib 145 constitutes the core installation surface 146 on which the rotor core 20 is installed. The rotor core 20 is fixed to the core installation surface 146 of the rotor core installation body 144 by inserting the rotor core 20 into the core installation surface 146 according to a guide (not shown). The central axis of the fixed rotor core 20 coincides with the central axis Xc of the rotor core installation body 144. In the following description, the central axis Xc of the rotor core installation body 144 may also be described as the central axis of the rotor core 20.

The magnet guide section 120 is installed on the front side of the base 110 in the front-rear direction, specifically, on the front side of the rotor core installation section 140. The magnet guide section 120 is a guide jig for movably supporting the magnet 30 along the direction of the central axis Xc (y direction) toward the magnet arrangement surface 204 located at the lowest position on the inner circumferential surface of the rotor core 20 installed in the rotor core installation section 140.

Figure 3 is an enlarged perspective view of the magnet guide section 120 in Figure 1. The magnet guide section 120 has guide sections 122 and 123 provided at the upper end on both sides in the left-right direction (x direction).

The left guide portion 122 is composed of a support surface 124 on the inside in the left-right direction (hereinafter also referred to as the "width direction") of the magnet guide portion 120, and a wall-like guide surface 125 on the outside of the support surface 124. The right guide portion 123 is composed of a support surface 126 on the inside in the width direction of the magnet guide portion 120, and a wall-like guide surface 127 on the outside of the support surface 126. The left support surface 124 and guide surface 125 and the right support surface 126 and guide surface 127 extend along the front-to-rear direction (y direction, hereinafter also referred to as the "longitudinal direction") of the magnet guide portion 120, from the front to the rear.

The left support surface 124 and the right support surface 126 are support parts that support both ends in the width direction of the magnet 30 to be placed. The left guide surface 125 and the right guide surface 127 are guide parts that restrict the movement of the magnet 30 supported by the support surfaces 124 and 126 in the width direction of the magnet guide part 120, allowing it to move only in the longitudinal direction. The position where the magnet 30 is initially placed is shown by hatching in Figure 4.

Figure 4 is an enlarged side view of the right guide portion 123 as viewed from the left guide portion 122. A support member 150 is installed along the longitudinal direction on the support surface 126 of the right guide portion 123.

Figure 5 is a front view showing the guide parts 122, 123 on which the magnet 30 is placed, as viewed from the front side in the fore-and-aft direction (y direction) of the magnet guide part 120. Since the support member 150 is provided on the left support surface 124, the magnet 30 is supported at an angle such that the right end portion, which is placed on the right support surface 126, is higher than the left end portion, which is placed on the left support surface 124.

As shown in FIG. 4, the support member 150 has an engagement portion 152 at its front end (positive y direction) that protrudes downward (negative z direction) and engages with the front surface of the magnet guide portion 120. As described below, when the magnet 30 is pressed against the support member 150 and moved toward the rotor core 20 (negative y direction), the engagement portion 152 is a portion that prevents the support member 150 from shifting due to a force acting in the negative y direction being applied to the support member 150.

As shown in FIG. 4, the support member 150 has a taper 154 at the rear end (-y direction) that decreases in height in the direction in which the magnet 30 is moved (-y direction). As described below, the taper 154 is a portion for gradually narrowing the gap between the magnet 30 and the magnet placement surface 204 of the rotor core 20 when the magnet 30 is moved toward the rotor core 20 (-y direction) while being pressed against the support member 150.

As shown in FIG. 1, the magnet sending unit 130 is installed on the left side of the base 110 in the left-right direction, specifically, on the left side (+z direction) of the magnet guide unit 120. The magnet sending unit 130 is a part for moving the magnet 30 placed on the magnet guide unit 120 along the direction of the central axis Xc (y direction) toward the magnet arrangement surface 204 of the rotor core 20.

Figure 6 is an enlarged perspective view of the magnet sending unit 130 in Figure 1. The magnet sending unit 130 includes a magnet sending lid 131 and a magnet sending mechanism 134.

The magnet feed mechanism 134 includes a magnet feed screw 136 and a rotating handle 135 for rotating the magnet feed screw 136. A magnet feed lid 131 is attached to the magnet feed screw 136 so that it can rotate around the magnet feed screw 136 as a central axis. The operator can cover the upper part of the magnet guide section 120 with the magnet feed lid 131 by rotating the magnet feed lid 131 toward the magnet 30 placed on the magnet guide section 120. At this time, the magnet 30 is pressed from above toward the guide parts 122 and 123 due to the weight from the magnet feed lid 131. This point will be described later.

When the operator turns the rotary handle 135 in the "forward" direction, the magnet feed lid 131 can be moved along the y direction (the direction of the central axis Xc) from the front side (+y direction) of the magnet guide section 120 to the rear side (-y direction). Conversely, when the operator turns the rotary handle 135 in the "return" direction, the magnet feed lid 131 can be moved along the y direction from the rear side of the magnet guide section 120 to the front side.

The surface of the magnet feed lid 131 facing the magnet 30 has a protrusion 132 that engages with the front end (+y direction side) of the magnet 30 as the magnet feed lid 131 rotates, and a protrusion 133 that engages with the rear end (-y direction side) of the magnet 30. Therefore, when the operator turns the rotation handle 135 in the "feed" direction, the magnet feed lid 131 presses the magnet 30 against the left support surface 124 and the right support member 150, while the magnet feed lid 131 moves, and the magnet 30 moves in the y direction (the direction of the central axis Xc) toward the magnet placement surface 204 of the rotor core 20.

The support member 150 is preferably made of a non-magnetic material so that the magnetic force of the magnet 30 does not cause the magnet 30 to stick to the support member 150 and inhibit the movement of the magnet 30. Similarly, the magnet guide section 120 and the magnet feed lid 131 are preferably made of a non-magnetic material.

In the magnet insertion jig 10 described above, the magnet 30 placed on the magnet guide section 120 can be moved by the magnet feed section 130 along the y direction (the direction of the central axis Xc) toward the magnet arrangement surface 204 located at the lowest end of the rotor core 20, and placed on the magnet arrangement surface 204. This allows the magnet 30 placed on the magnet arrangement surface 204 to be adhered to the magnet arrangement surface 204 with the adhesive Ead pre-filled in the adhesive groove 206. Note that, for the other magnet arrangement surfaces 204, the magnet arrangement surface 204 on which the magnet 30 is not placed can be moved to the lowest end position by rotating the rotor core installation body 144, and the magnet 30 can be similarly placed thereon.

Figure 7 is an explanatory diagram showing the state of the magnet 30 in the middle of moving onto the magnet placement surface 204. As described above, due to the load applied from the magnet feed lid 131 to the magnet 30, the right end (-x direction side) of the magnet 30 is pressed from above against the support member 150 provided on the support surface 126 of the right guide portion 123. Also, although not shown, the left end (+x direction side) of the magnet 30 is pressed from above against the support surface 124 of the left guide portion 122 (see Figures 3 and 5). Therefore, as shown in Figure 7, even if a portion of the magnet 30 is not supported by the support member 150 due to the movement, the pressure pressed against the support member 150 allows the magnet 30 to move while maintaining the distance Ds from the magnet placement surface 204 against the attractive force generated between the magnet 30 and the magnet placement surface 204 by the magnetic force of the magnet 30. This allows the magnet 30 to remain out of contact with the adhesive Ead in the adhesive groove 206 until just before the magnet 30 is placed on the magnet placement surface 204. This prevents the adhesive Ead from being dragged along by the insertion of the magnet 30, and ensures that the amount of adhesive Ead required for adhering the magnet 30 does not run short.

In addition, the taper 154 of the support member 150 allows the gap Ds between the magnet 30 moving on the taper 154 and the magnet placement surface 204 to be gradually narrowed, allowing the magnet 30 to smoothly come into contact with the magnet placement surface 204. This makes it possible to suppress the impact on the magnet 30 caused by the attractive force of the magnetic force of the magnet 30 when the magnet 30 comes into contact with the magnet placement surface 204, and prevents the magnet 30 from cracking or chipping.

In addition, the rotor core 20 into which the magnets 30 are inserted using the magnet insertion tool 10 does not have a modified rotor core structure as in the prior art, so there is no increase in costs or deterioration in performance.

B. Other embodiments:
(B1) The magnet guide section 120, magnet feed section 130, and rotor core installation section 140 of the magnet insertion jig 10 described in the above embodiment are not limited to the structures described above.

The magnet guide section 120 may have a structure including guide sections 122 and 123 on both sides that support the magnet 30 arranged on the magnet arrangement surface 204 at both ends in the width direction corresponding to the circumferential direction of the rotor core 20, so that the magnet 30 can be moved toward the magnet arrangement surface 204 along the direction of the central axis Xc of the rotor core 20. A support member 150 is provided on one of the guide sections 123, and the end of the support member 150 on the magnet arrangement surface 204 side has a taper 154 whose height decreases toward the magnet arrangement surface 204. Although the support member 150 has been described as a separate member from the guide section 123, it may also be configured as an integral part of the guide section 123.

The magnet sending section 130 may have any structure that allows the magnet 30 placed on the magnet guide section 120 to be moved along the central axis of the rotor core 20 toward the magnet placement surface 204 of the rotor core 20 while pressing the magnet 30 from above toward the support member 150 provided on one guide section 123 and the other guide section 122.

The rotor core installation section 140 may have any structure that can support the rotor core 20 so that it can rotate around the central axis of the rotor core 20.

(B2) The magnet insertion tool 10 of the above embodiment has been described as being configured to correspond to an outer rotor having a magnet arrangement surface 204 on the inner circumferential surface of the rotor core 20. However, this is not limited to this, and it can also be applied to an inner rotor having a magnet arrangement surface 204 on the outer circumferential surface of the rotor core 20. However, as shown in FIG. 1, in the case of an outer rotor, the magnet 30 is inserted into the magnet arrangement surface 204 at the lowest end of the inner circumferential surface of the rotor core 20, whereas in the case of an inner rotor, the magnet may be inserted into the magnet arrangement surface at the highest end of the outer circumferential surface of the rotor core.

The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each form described in the Summary of the Invention column can be replaced or combined as appropriate to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate.

10...magnet insertion tool, 20...rotor core, 30...magnet, 110...base, 120...magnet guide part, 122...guide part, 123...guide part, 124...support surface, 125...guide surface, 126...support surface, 127...guide surface, 130...magnet feed part, 131...magnet feed cover, 132...projection, 133...projection, 134...magnet feed mechanism, 135...rotating handle, 136...magnet feed screw, 140...rotor core installation part, 142...support body, 144...rotor core installation body, 145...rib, 146...core installation surface, 150...support member, 152...engagement part, 154...taper, 202...rib, 204...magnet arrangement surface, 206...adhesive groove, Ead...adhesive, Xc...center axis

Claims (1)

A magnet insertion tool for arranging magnets on a magnet arrangement surface of a rotor core, comprising:
guide portions on both sides that support widthwise ends of the magnets corresponding to the circumferential direction of the rotor core so as to be movable in a central axis direction of the rotor core toward the magnet arrangement surface;
a support member provided on only one of the guide portions on both sides , the support member having a taper at an end portion on the magnet arrangement surface side, the height of the support member decreasing toward the magnet arrangement surface;
A magnet insertion tool comprising:

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