JP2021022973A - Permanent magnet motor and manufacturing device thereof - Google Patents

Abstract

To enable checking easily and reliably that adhesive agent is filled uniformly between a permanent magnet and a rotor core over the whole area when bonding the permanent magnet to the rotor core.SOLUTION: When a magnet sticking groove 31 matched to a shape of a permanent magnet 10 is formed in a rotor core 30, the permanent magnet 10 is pressed to the magnet sticking groove 31, and a bottom surface of the permanent magnet 10 and a bottom surface of the magnet sticking groove 31 are bonded with adhesive agent 20 applied therebetween, the adhesive agent 20 flows out from a gap between a side wall 31A of the magnet sticking groove 31 and a side surface 10C of the permanent magnet 10 facing each other, and an application state of the adhesive agent 20 can be checked by visibly recognizing the adhesive agent 20 protruded on a side wall upper surface 31B of the magnet sticking groove 31.SELECTED DRAWING: Figure 9

Description

The present application relates to a permanent magnet motor and a device for manufacturing a permanent magnet motor.

Conventionally, in this type of technique, an irreversibly thermally expandable adhesive is first placed between the seating surface of the rotor core and the inner peripheral surface of the magnetized permanent magnet. Here, as for the seating surface, a magnet attaching groove is provided between a plurality of salient poles formed on the outer periphery of the rotor core, and the bottom surface of the magnet attaching groove is the seating surface. The adhesive is arranged by applying the adhesive to either the inner peripheral surface of the permanent magnet or the seating surface of the magnet attachment groove in advance and inserting the permanent magnet into the magnet attachment groove. Will be done. After that, the permanent magnet is fixed to the rotor core by a method of accelerating the curing of the adhesive by naturally curing the adhesive or heating the adhesive and shortening the fixing time.

If the thickness of the adhesive layer formed between the permanent magnet and the rotor core is not uniform, the motor output will fluctuate. In addition, the adhesive strength is reduced and the permanent magnet may be peeled off due to centrifugal force due to high-speed rotation. Therefore, it is necessary to confirm whether the thickness of the adhesive layer is uniformly spread over the entire bottom surface of the permanent magnet. As a method of confirming that the adhesive is applied in an appropriate amount, there are the following methods.
That is, in a permanent magnet motor, a groove matching the shape of the permanent magnet is formed in the electromagnetic steel plate constituting the rotor core, the permanent magnet is pushed into the groove, and the permanent magnet is adhered by an adhesive applied between the bottom surfaces of the two. At that time, an adhesive storage recess is formed at the upper end of the side wall of the groove from between the bottom surfaces of the groove to introduce the adhesive that has flowed out through the gap between the side wall of the groove and the side wall of the permanent magnet. By visually recognizing the amount of the adhesive stored in this recess, the state of application of the adhesive can be confirmed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-12507

In Patent Document 1, by providing the adhesive storage recess in the rotor core, it is possible to visually recognize the adhesive that has overflowed from the side wall of the magnet attachment groove and has accumulated in the adhesive storage recess. However, since it is necessary to process the adhesive storage recess every time the rotor core is produced, there is a problem that the processing man-hours increase.

The present application discloses a technique for solving the above-mentioned problems, and when a permanent magnet is adhered to a rotor core in a permanent magnet motor, the adhesive is uniformly applied between the permanent magnet and the rotor core over the entire surface. The purpose is to provide a function to easily and surely confirm that the magnet is filled. Another object of the present invention is to provide a function of attaching a magnetized permanent magnet with high accuracy to a groove for attaching a magnet formed in the rotor core.

The permanent magnet motor disclosed in the present application includes a stator provided with a stator winding, a rotor core coaxially arranged inside the stator, and a permanent magnet attached to the rotor core with an adhesive. hand,
A magnet attachment groove matching the shape of the permanent magnet is formed on the electromagnetic steel plate, the permanent magnet is pushed into the magnet attachment groove, and the permanent magnet is applied between the bottom surface of the permanent magnet and the bottom surface of the magnet attachment groove. The adhesive that flows out through a gap between the side wall of the magnet attachment groove facing each other and the side surface of the permanent magnet when adhering with the adhesive, and is the side wall of the magnet attachment groove. By visually recognizing the adhesive that protrudes from the upper surface, it is possible to confirm the application state of the adhesive.

The permanent magnet motor manufacturing apparatus disclosed in the present application is attached to a stator provided with a stator winding, a rotor core coaxially arranged inside the stator, and a magnet attachment groove provided in the rotor core with an adhesive. A permanent magnet motor manufacturing device equipped with a permanent magnet attached.
A block having a shape along the shape of a surface of the permanent magnet facing the surface to which the adhesive is applied and being made of a magnetic material, and a permanent magnet inserted into a hole provided in the block. An extrusion rod made of a magnetic material for pressing, a magnet chuck made of a magnetic material for centering the permanent magnet, and positioning of the permanent magnet provided on one side of the permanent magnet in the Z-axis direction. A positioning block made of a non-magnetic material and a Z-axis pusher provided on the other side of the permanent magnet in the Z-axis direction and made of a non-magnetic material for pressing the permanent magnet against the positioning block are provided. It is a permanent magnet.

According to the permanent magnet disclosed in the present application, when the permanent magnet is adhered to the rotor core, it can be easily and surely confirmed that the adhesive is uniformly filled over the entire surface between the permanent magnet and the rotor core. ..
Further, according to the permanent magnet manufacturing apparatus disclosed in the present application, the thickness of the adhesive layer does not become non-uniform. Furthermore, since the adhesive strength is not affected, the permanent magnet does not come off.

It is a top view which shows the permanent magnet motor according to Embodiment 1. FIG. It is a front view which shows the magnet sticking head part by Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 2 is a plan sectional view taken along line BB in FIG. It is a perspective view which shows the permanent magnet according to Embodiment 1. FIG. FIG. 5 is an enlarged plan sectional view showing a permanent magnet attaching operation according to the first embodiment. FIG. 5 is an enlarged plan sectional view showing a permanent magnet attaching operation according to the first embodiment. FIG. 5 is an enlarged plan sectional view showing a permanent magnet attaching operation according to the first embodiment. FIG. 5 is an enlarged plan sectional view showing a permanent magnet attaching operation according to the first embodiment. It is an enlarged plan sectional view which shows the tip part of the magnet chuck according to Embodiment 1. FIG. It is an enlarged plan sectional view which shows the tip shape of the magnet chuck according to Embodiment 2. FIG. It is a top view which shows the shape of the block by Embodiment 3. FIG.

Embodiment 1.
The present application relates to a sticking device and a sticking method when an adhesive is applied to a magnetized permanent magnet before sticking to a rotor in a permanent magnet motor and the permanent magnet is stuck to a rotor core.
FIG. 1 is a plan sectional view showing a permanent magnet motor according to the first embodiment. In FIG. 1, a rotor core 30 formed by laminating electromagnetic steel sheets is provided coaxially with the stator 100 inside the stator 100. In the stator 100, the stator winding 101 is wound around the magnetic pole teeth 102, and in the rotor core 30, the permanent magnet 10 is attached to the magnet attachment groove 31 by an adhesive.

FIG. 2 is a front view showing the magnet attaching head portion 1 according to the first embodiment, and is a view seen from the magnet attaching surface. 3 is a side sectional view taken along line AA in FIG. 2, and FIG. 4 is a plan sectional view taken along line BB in FIG. FIG. 5 is a perspective view showing the dome-shaped permanent magnet 10. In the figure, the axis extending in the longitudinal direction of the permanent magnet 10 with respect to the center of gravity O of the permanent magnet 10 is the Z axis, and the axis extending in the lateral direction is Y. The axis perpendicular to the axis, Z axis, and Y axis is defined as the X axis. In FIGS. 2 to 4, in the magnet attaching head portion 1, the block (curved block installed along the radius of curvature R) 11 for gripping the permanent magnet 10 by the magnetic attraction force is the X-axis direction X1 of the permanent magnet 10. It is provided on the side of the side. Further, it has an extrusion rod 12 that moves in the X-axis direction in the block 11. Further, magnet chucks 14 made of a magnetic material for centering the permanent magnets 10 are provided on both sides of the block 11 in the Y-axis direction. Further, a positioning block 18 serving as a positioning reference for the permanent magnet 10 is installed on one side (lower side) of the block 11 in the Z-axis direction, and is permanently attached to the positioning block 18 on the other side (upper side) of the block 11 in the Z-axis direction. A Z-axis pusher 16 for pressing the magnet 10 is installed. The magnet attachment head portion 1 constitutes the permanent magnet motor manufacturing apparatus of the present application.

The permanent magnet 10 is a magnet composed of neodym having a surface 10A to which the adhesive 20 is applied and an opposing curved surface 10B, and the block 11 uses the magnetic force of the permanent magnet 10 on the curved surface 10B of the permanent magnet 10. The permanent magnet 10 has the same width as the width in the Y-axis direction, and the length in the Z-axis direction has the same length as or longer than the length of the permanent magnet 10. Further, the block 11 is made of a magnetic material having a curved surface 11D having a shape along the curved surface 10B of the permanent magnet 10, and has a volume equal to or larger than the saturation magnetization region. Round holes 11A that penetrate at least three places in the X-axis direction of the block 11 so as to correspond to the lengths of a plurality of magnets in the Z-axis direction are provided. An extrusion rod 12 made of a columnar magnetic material is inserted into each of the penetrating round holes 11A. Although FIG. 2 shows a case where one permanent magnet 10 is installed, a plurality of permanent magnets may be installed at the same time in the Z-axis direction.

The tip 12A of the extrusion rod 12 on the surface in contact with the permanent magnet 10 is not stable in the posture of the permanent magnet 10 when the curved surface 10B of the permanent magnet 10 is pressed against the flat surface. Therefore, the curved surface 10B of the permanent magnet 10 The tip portion 12A of the extrusion rod 12 is processed into a curved shape so as to match the shape along the above. In FIG. 4, the tip portion 12A of the extrusion rod 12 is drawn so as to be flat, but is actually formed in a curved shape.
Then, as a setting of the magnet sticking head portion 1 before sticking the permanent magnet 10 described with reference to FIGS. 6 to 9 to the rotor core 30, by operating the push rod actuator 13 for driving the push rod 12 back and forth. When retracting (when moving away from the permanent magnet 10), the curved tip portion 12A of the extrusion rod 12 does not protrude from the curved surface 11D of the block 11. Further, the curved surface 11D of the block 11 and the curved tip 12A of the extrusion rod 12 are oriented in the same direction, and the curved surface 11D of the block 11 and the curved surface 12A of the tip 12A of the extrusion rod 12 are the curved surfaces 10B of the permanent magnet 10. Make sure that it is in line with.

That is, the tip portion 12A of the cylindrical (round cross-section) extrusion rod 12 is curved, and the block 11 is also curved in the same manner as the extrusion rod 12. Here, since the extrusion rod 12 is formed in a columnar shape, if it rotates, the curved surface 11D of the block 11 and the curved tip portion 12A of the extrusion rod 12 will not be aligned, and a clean arc cannot be drawn. That is, the curved tip portion 12A of the extrusion rod 12 protrudes from the curved surface 11D of the block 11. Therefore, when the permanent magnet 10 is attached to the block 11, the permanent magnet 10 may be damaged by the tip portion 12A of the extrusion rod 12. Therefore, the direction of the curved surface 11D of the block 11 and the curved tip portion 12A of the extrusion rod 12 are the same.

When the push rod 12 moves forward (when approaching the permanent magnet 10) by the push rod actuator 13, the curved tip portion 12A of the push rod 12 protrudes from the curved surface 11D of the block 11 by about 30 mm, and the permanent magnet 10 is stable. And push it straight out. As shown in FIG. 4, magnet chucks 14 made of a magnetic material for centering the permanent magnet 10 so that the center line of the block 11 is located on the X-axis of the permanent magnet 10 are installed on both sides of the block 11. An actuator 15 for a magnet chuck for opening and closing the magnet chuck 14 is provided. It is important that the left and right magnet chucks 14 have the same closing speed so that the center line of the block 11 is located on the X-axis of the permanent magnet 10.

Further, when an impact is applied to the permanent magnet 10, the permanent magnet 10 is cracked or chipped. Therefore, it is necessary to adjust the speed and gripping force so that the permanent magnet 10 is not cracked or chipped. Further, on the lower side of the block 11 in the Z-axis direction, there is a positioning block 18 made of a square column non-magnetic material, and a Z-axis pusher made of a non-magnetic material for pressing the permanent magnet 10 against the positioning block 18. 16 is provided. Then, an actuator 17 for a Z-axis pusher for driving the Z-axis pusher 16 up and down is installed, and the magnet sticking head portion 1 is configured by the above components.

The position where the permanent magnet 10 is pressed against the positioning block 18 is used as the positioning reference in the Z-axis direction. When a single row of magnets is attached, that is, when only one permanent magnet 10 is installed in the Z-axis direction as shown in FIG. 3, the material of the Z-axis pusher 16 and the positioning block 18 may be a magnetic material. On the other hand, in the case of so-called two-row pasting in which two or more are arranged side by side in the Z-axis direction and arranged on the circumference of the rotor core 30, if the materials of the Z-axis pusher 16 and the positioning block 18 are magnetic materials, one row The positioning block 18 comes into contact with the permanent magnets 10 of the eyes, and since the positioning block 18 is made of a magnetic material, the magnetic attraction force downward on the Z axis with respect to the permanent magnets 10 in the second row increases, and magnetic attraction occurs. Since the direction is not directed toward the normal direction of the sticking surface of the magnet sticking groove 31, but is attracted toward the permanent magnet 10 in the first row, the permanent magnet 10 in the second row to be stuck is the permanent magnet in the first row. You will end up riding on top of 10. Therefore, in this case, the materials of the Z-axis pusher 16 and the positioning block 18 are non-magnetic materials.

Next, a method of attaching the permanent magnet 10 by the magnet attaching head portion 1 will be described. First, a method of installing the pre-magnetized permanent magnet 10 on the magnet attaching head portion 1 will be described. First, the Z-axis pusher actuator 17 is driven backward (in the direction away from the permanent magnet 10) to raise the Z-axis pusher 16. Further, the magnet chuck actuator 15 is driven backward (in the direction away from the permanent magnet 10) to open the magnet chuck 14. Further, the push rod actuator 13 is driven forward to push the push rod 12 out from the curved surface 11D of the block 11. The state at this time is the initial state.

Next, as shown in FIG. 2, the adhesive 20 is linearly applied to the surface 10A to be coated, which is the flat side of the pre-magnetized permanent magnet 10. In this case, as shown in FIG. 9, the adhesive 20 protrudes from the gap between the side surface 10C of the permanent magnet 10 and the side wall 31A of the magnet attachment groove 31 and extends to the upper surface 31B of the side wall 31A of the magnet attachment groove 31. Set to the amount of. By pressing the curved surface 10B of the permanent magnet 10 against the extrusion rod 12 which is a magnetic material protruding from the curved surface 11D of the block 11, the permanent magnet 10 is attracted by utilizing the magnetic attraction force. Next, when the push-out rod actuator 13 is driven backward and the push-out rod 12 is retracted, the curved surface 11D of the block 11 and the curved surface 10B of the permanent magnet 10 come into contact with each other, and the block 11 is subjected to magnetic attraction. The permanent magnet 10 is attracted and fixed.

Next, when the Z-axis pusher actuator 17 is driven forward (in the direction of approaching the permanent magnet 10) and the Z-axis pusher 16 is lowered, the permanent magnet 10 pushed by the Z-axis pusher 16 comes into contact with the positioning block 18 and is positioned. The position of the permanent magnet 10 in the Z-axis direction is determined. When the Z-axis pusher 16 gives an impact to the permanent magnet 10, magnet cracking or chipping occurs, so it is necessary to slow down the speed of the Z-axis pusher actuator 17. Next, the permanent magnet 10 is centered by driving the magnet chuck actuator 15 forward and simultaneously driving the magnet chucks 14 on both sides with the same force. The center of the block 11 in the Z-axis direction shown in FIG. 2 and the Z-axis of the permanent magnet 10 are aligned with each other, the position of the permanent magnet 10 in the Y-axis direction is determined by the magnet chuck 14, and the permanent magnet 10 is attached to the magnet attachment head portion 1. Installation of the permanent magnet 10 is completed.

Since the permanent magnet 10 is installed without opening the magnet chuck 14 and the Z-axis pusher 16, the side surface of the permanent magnet 10 in contact with the magnet chuck 14 and the Z-axis pusher 16 may be scratched. Therefore, it is necessary to reduce the air pressure of the magnet chuck actuator 15 and the Z-axis pusher actuator 17. Since the setting of the air pressure is related to the plating process of the permanent magnet 10 and the frictional force between the permanent magnet 10 and the magnet chuck 14 and the Z-axis pusher 16, it is necessary to verify in advance by an experiment or the like.

Next, a method of attaching the permanent magnet 10 installed in the magnet attaching head portion 1 to the rotor core 30 will be described. 6 to 9 are enlarged plan sectional views showing a method of attaching the permanent magnet 10 installed on the magnet attaching head portion 1 to the rotor core 30. FIG. 6 is a cross-sectional view showing when the magnet attachment head portion 1 is brought closer to the rotor core 30, and FIG. 7 is a cross-sectional view when the magnet attachment head portion 1 is further brought closer to the rotor core 30 and the bottom surface of the permanent magnet 10 is in contact with the magnet attachment groove 31. FIG. 8 is a cross-sectional view showing an operation of peeling the permanent magnet 10 from the block 11, and FIG. 9 is a cross-sectional view showing the case where the attachment is completed.

After installing the permanent magnet 10 on the magnet pasting head portion 1 as described above, when the magnet pasting head portion 1 is brought closer to the rotor core 30, as shown in FIG. 6, the permanent magnet 10 attached to the magnet pasting head portion 1 The state shown in FIG. 6 is obtained by positioning the X-axis so as to be aligned with the center of the magnet attachment groove 31 provided on the rotor core 30 and bringing the magnet attachment head portion 1 closer to the rotor core 30. Further, when the magnet attachment head portion 1 is brought closer to the rotor core 30, the adhesive 20 is crushed as shown in FIG. FIG. 7 shows a state in which the magnet attachment head portion 1 is stopped from approaching. It is necessary to set the stop position to an appropriate position, and the distance between the bottom surface of the permanent magnet 10 and the bottom surface of the magnet attachment groove 31 is such that the bead diameter contained in the adhesive 20 is the minimum value, and the permanent magnet 10 is the rotor core. The maximum value is set so that the permanent magnet 10 does not break even if it jumps to 30. Then, it is important to verify in advance by experiments or the like to set the value within the range from the above minimum value to the maximum value, obtain the distance, and control so as to stop when the distance from the magnet attachment surface is the distance obtained from the verification result. ..

Next, when the extrusion rod 12 is pushed out while retracting the magnet attaching head portion 1 (separating it from the permanent magnet 10), the permanent magnet 10 attracted to the block 11 is peeled off by the magnetic attraction force, and the magnetic attraction force is applied to the rotor core 30 side. As a result, the permanent magnet 10 is attracted. This state is shown in FIG. If the retracting speed of the magnet attaching head portion 1, that is, the retracting speed of the block 11 is faster than the speed at which the push rod 12 advances (approaches the permanent magnet 10), the permanent magnet exceeds the stop position of the magnet attaching head portion 1. Since the distance between the bottom surface of the 10 and the bottom surface of the magnet attachment groove 31 is widened, the permanent magnet 10 may be cracked or chipped. Therefore, it is necessary to set the speed at which the magnet sticking head portion 1 is retracted to be equal to or slower than the advancing speed of the extrusion rod 12.

Here, the block 11 does not move individually, but moves together with the entire magnet attachment head portion having the block 11 and the extrusion rod 12. That is, if the entire magnet attachment head portion moves too quickly, it is the same as attaching the permanent magnet 10 at a position retracted from the attachment position, and the distance between the permanent magnet 10 and the attachment surface is increased, so that the permanent magnet 10 is cracked. Or there is a possibility that chipping will occur. Therefore, the extrusion rod 12 moves forward, and the entire magnet attachment head portion (including the block 11) is retracted from the state where the permanent magnet 10 is pressed against the attachment surface.

Next, when the magnet attachment head portion 1 is further retracted, the permanent magnet 10 is separated from the extrusion rod 12, the permanent magnet 10 is completely separated from the magnet attachment head portion 1, and the permanent magnet 10 is attached to the magnet attachment groove 31. Is completed. This state is shown in FIG. Next, by returning to the initial state, the magnet can be repeatedly attached.

FIG. 10 is an enlarged plan sectional view showing a tip portion of the magnet chuck 14, and shows the tip shape of the magnet chuck 14 so as to prevent the adhesive 20 from adhering. The magnet chuck 14 not only serves as a centering and chuck for the permanent magnet 10, but also has a purpose of strengthening the magnetic attraction force to the magnet attaching head portion 1. If the permanent magnet 10 is magnetically attracted only by the block 11, when the permanent magnet 10 is magnetically attracted to the rotor core 30, when the magnet is brought close to the magnet attachment groove 31, the magnetic attraction force toward the rotor core 30 is increased by the influence of the side wall 31A of the magnet attachment groove 31. It becomes stronger than the magnetic attraction force on the sticking head part side, and the permanent magnet 10 magnetically attracted to the magnet sticking head part 1 before the bottom surface of the permanent magnet 10 comes into contact with the magnet sticking groove 31 jumps to the rotor core 30 side and is permanent. There is a possibility that the magnet 10 may be cracked or chipped. As a countermeasure, by chucking the side surface 10C of the permanent magnet 10 with a component made of a magnetic material, the leakage magnetic flux from the side surface 10C of the permanent magnet 10 can be reduced, so that the magnetic attraction force is strengthened and the bottom surface of the permanent magnet 10 and the magnet. The permanent magnet 10 will not jump even if the distance from the bottom surface of the sticking groove 31 is short. Further, since the impact is alleviated by the film thickness of the applied adhesive 20, it is possible to prevent the permanent magnet 10 from cracking or chipping.

Next, measures against adhesion of the protruding adhesive 20 to the magnet chuck 14 will be described. In this type of motor, if the gap between the outer surface of the permanent magnet 10 adhered to the rotor core 30 and the inner surface of the stator 100 with respect to the outer surface is non-uniform for each permanent magnet, the motor output may fluctuate. .. Therefore, it is necessary to bond the permanent magnet 10 so that the bottom surface of the permanent magnet 10 and the bottom surface of the magnet attachment groove 31 formed on the outer surface of the rotor core 30 are parallel to each other and a layer of the adhesive 20 is formed with a uniform thickness. If the gap between the outer surface of the permanent magnet 10 and the inner surface of the stator 100 is non-uniform for each permanent magnet, minute torque fluctuations will occur periodically, and the motor used for the hoisting machine of the elevator will have a comfortable ride. It also causes deterioration.

Therefore, when the permanent magnet 10 of this type is adhered to the rotor core 30, the adhesive 20 is applied to either the bottom surface of the permanent magnet 10 or the bottom surface of the magnet attachment groove 31, and the permanent magnet 10 is weighted and fitted. The adhesive 20 is made to swell around the permanent magnet by the external force, the sticking method, and the magnetic attraction force of the permanent magnet 10, and the swelling state is visually confirmed to confirm the bonding state of the permanent magnet 10. However, since the adhesive 20 that has squeezed out has a problem of adhering to the magnet chuck 14, a certain amount of adhesive is applied to the bottom surface of the permanent magnet 10 at a fixed position, and the adhesive that squeezes out to the protruding upper surface of the rotor core 30. The shape of 20 is measured in advance, and the corner of the tip of the magnet chuck 14 is cut into a square 14A so that the adhesive 20 that has squeezed out does not adhere to the magnet chuck 14.

As a result, the shape of the adhesive 20 that protrudes can be visually recognized without the adhesive 20 adhering to the magnet chuck 14. Further, since it is not necessary for the operator to remove the adhesive 20, it is not necessary to temporarily stop the equipment, and continuous automatic production is possible.
When it can be visually confirmed that the adhesive 20 protruding from the top, bottom, left and right of the permanent magnet 10, it is determined that the adhesive 20 evenly spreads the gap between the bottom surface of the permanent magnet 10 and the bottom surface of the magnet attachment groove 31. can do.

That is, in the present embodiment, a magnet attachment groove 31 matching the shape of the permanent magnet 10 is formed on the electromagnetic steel plate, the permanent magnet 10 is pushed into the magnet attachment groove 31, and the bottom surface of the permanent magnet 10 and the magnet attachment groove 31 are formed. When adhering with the adhesive 20 applied to the bottom surface of the magnet, as shown in FIG. 9, it flows out through the gap between the side wall 31A of the magnet attachment groove 31 facing each other and the side surface 10C of the permanent magnet 10. The adhesive 20 is made so that the applied state of the adhesive 20 can be confirmed by visually recognizing the adhesive 20 protruding from the upper surface 31B of the side wall 31A of the magnet attachment groove 31. As a result, it can be confirmed that an appropriate amount of the adhesive 20 is applied, and it is confirmed that the adhesive 20 is evenly spread in the gap between the bottom surface of the opposing magnet attachment groove 31 and the bottom surface of the permanent magnet 10. Therefore, the adhesive strength can be guaranteed.

As described above, in the present embodiment, when the permanent magnet 10 is adhered to the rotor core 30 in the permanent magnet motor, the adhesive 20 is uniformly filled between the permanent magnet 10 and the rotor core 30 over the entire surface. It can be confirmed easily and surely. Further, the magnetized permanent magnet 10 can be attached to the magnet attachment groove 31 formed in the rotor core 30 with high accuracy.
Further, when the magnetized permanent magnet 10 is brought closer to the rotor core 30, a magnetic attraction force is generated between the permanent magnet 10 and the rotor core 30, and the force for gripping the permanent magnet 10 of the magnet attachment head portion 1 is the permanent magnet 10 and the rotor core. When the force is less than the magnetic attraction force with 30, the permanent magnet 10 may jump to the rotor core 30 and the permanent magnet 10 may be cracked or chipped. Therefore, in order to prevent the permanent magnet 10 from being cracked or chipped, a mechanism for strengthening the gripping force of the permanent magnet 10 is provided.

Embodiment 2.
FIG. 11 is an enlarged plan sectional view showing the tip shape of the magnet chuck 14 according to the second embodiment. The tip shape of the magnet chuck 14 is cut into an arc shape 14B. Since the shape of the adhesive 20 protruding from the side wall of the magnet attachment groove 31 is spherical, the tip of the magnet chuck 14 is processed so as to have an arc shape. As a result, the amount of cutting is suppressed as compared with cutting at a right angle, the cross-sectional area of the tip of the magnet chuck 14 is increased, and the magnetic attraction force can be strengthened. Therefore, the distance at which the permanent magnet 10 jumps to the rotor core 30 can be further reduced.

Embodiment 3.
FIG. 12 is a plan view showing the shape of the block according to the third embodiment. In order to reduce the distance that the permanent magnet 10 jumps to the rotor core 30, it is desirable to set the magnetic attraction force to the magnet attachment head portion 1 to be equal to or higher than the magnetic attraction force to the rotor core 30. Therefore, it is effective to configure the block 40 that integrates the magnet chuck and the block. Since the gap between the magnet chuck 14 and the block 11 as shown in FIG. 6 is eliminated, the magnetic attraction force is strengthened, and the distance at which the permanent magnet 10 jumps to the rotor core 30 can be further reduced.

In addition, the number, dimensions, materials, etc. of the above-mentioned components can be changed as appropriate.
Further, although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are those of a particular embodiment. It is not limited to application, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

10 Permanent magnets, 11 blocks, 12 push rods, 14 magnet chucks,
16 Z-axis pusher, 18 positioning block, 20 adhesive, 30 rotor core,
31 Magnet attachment groove, 100 stator, 101 stator winding.

Claims (5)

A permanent magnet motor including a stator provided with a stator winding, a rotor core coaxially arranged inside the stator, and a permanent magnet attached to the rotor core with an adhesive.
A magnet attachment groove matching the shape of the permanent magnet is formed in the rotor core, the permanent magnet is pushed into the magnet attachment groove, and the permanent magnet is applied between the bottom surface of the permanent magnet and the bottom surface of the magnet attachment groove. The adhesive that flows out through the gap between the side wall of the magnet attachment groove facing each other and the side surface of the permanent magnet when adhering with the adhesive, and is the upper surface of the side wall of the magnet attachment groove. A permanent magnet motor that enables confirmation of the application state of the adhesive by visually recognizing the adhesive that has squeezed out. Manufacture of a permanent magnet motor including a stator provided with a stator winding, a rotor core coaxially arranged inside the stator, and a permanent magnet attached to a magnet attachment groove provided in the rotor core with an adhesive. It ’s a device,
A block having a shape along the shape of a surface of the permanent magnet facing the surface to which the adhesive is applied and being made of a magnetic material.
An extrusion rod that is inserted into a hole provided in the block and is made of a magnetic material for pressing the permanent magnet.
A magnet chuck made of a magnetic material for centering the permanent magnet,
A positioning block provided on one side of the permanent magnet in the Z-axis direction and made of a non-magnetic material for positioning the permanent magnet,
An apparatus for manufacturing a permanent magnet motor provided on the other side of the permanent magnet in the Z-axis direction and provided with a Z-axis pusher made of a non-magnetic material for pressing the permanent magnet against the positioning block. The permanent magnet motor manufacturing apparatus according to claim 2, wherein a notch is provided at a corner of the tip of the magnet chuck. The permanent magnet motor manufacturing apparatus according to claim 3, wherein the cutout portion is formed in an arc shape. The permanent magnet motor manufacturing apparatus according to any one of claims 2 to 4, wherein the magnet chuck and the block are integrally formed.

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