JP2022103879A - Rotor manufacturing apparatus - Google Patents

Abstract

To provide a rotor manufacturing apparatus exhibiting excellent workability, and improving a magnetization rate of a magnet.SOLUTION: A rotor manufacturing apparatus 100 provided with a member-conveying passage P which is provided at an opening end peripheral edge of at least one magnet insertion hole 2h that penetrates in an axial direction of a rotor core 2, for making a magnet 10 inserted in the magnet insertion hole 2h pass through in the axial direction, comprises a magnetization device 20 that forms a magnetic field for magnetizing the magnet 10 in the member-conveying passage P, and conveyance means 30 for conveying the magnet 10 made to pass through the member-conveying passage P into the magnet insertion hole 2h in a state of sandwiching the magnet 10 from the axial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotor manufacturing apparatus.

Examples of the magnetic circuit provided with a permanent magnet include a rotor used in an electric motor, a generator, and the like. Some rotors have a plurality of permanent magnets mounted on a rotor core in which electromagnetic steel sheets or the like are laminated. When manufacturing such a rotor, from the viewpoint of workability and prevention of foreign matter contamination, an unmagnetized magnet is attached to the rotor core, and then a magnetic field is applied from the outside of the rotor to magnetize the magnet. The method may be taken.

In Patent Document 1, an unmagnetized permanent magnet material is combined and fixed in a tubular shape inside a tubular outer peripheral yoke that is supported and fixed on the outside of a center pole at a predetermined interval, and then the magnetic circuit is described. , A set of magnetizing center poles located on the axis of the center pole and a plurality of magnetizing side poles that are partially in contact with or close to / or a plurality of magnetizing side poles on the outer peripheral surface of the tubular outer peripheral yoke. A magnetic circuit characterized in that the magnetic circuit is partially magnetized by performing relative motion in the yoke axial direction and / or the yoke circumferential direction between the magnetizing side pole and the tubular outer peripheral yoke. The method of assembling and magnetizing the above is disclosed.

Japanese Unexamined Patent Publication No. 58-107611

However, in the assembly magnetizing method described in Patent Document 1, it is difficult to apply a strong magnetic field to the magnet as compared with the magnetizing assembly method in which the magnet is magnetized independently and then assembled, and the magnetizing rate of the magnet is lowered. There was a problem of doing. On the other hand, in the magnetized assembly method, when the magnetized magnet is assembled to the magnetic circuit, foreign matter such as iron powder may adhere to the magnet, which may make the assembly difficult.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a rotor manufacturing apparatus having good workability and improving the magnetizing rate of a magnet.

The rotor manufacturing apparatus according to one embodiment is provided on the peripheral edge of the open end of at least one magnet insertion hole penetrating in the axial direction of the rotor core, and has a member transport path for passing the magnet inserted into the magnet insertion hole in the axial direction. A magnetizing device that forms a magnetic field that magnetizes a magnet in the member transport path, and a transport means that transports the magnet that has passed through the member transport path with the magnet sandwiched from the axial direction into the insertion hole. ..

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a rotor manufacturing apparatus having good workability and improving the magnetizing rate of a magnet.

It is a figure explaining the magnetizing apparatus of the rotor manufacturing apparatus which concerns on Embodiment 1. FIG. It is sectional drawing which shows the schematic structure of the rotor manufacturing apparatus which concerns on Embodiment 1. FIG. It is a flowchart explaining the manufacturing method of the rotor using the rotor manufacturing apparatus which concerns on Embodiment 1. FIG. It is sectional drawing which shows the step S1 of the flowchart shown in FIG. It is sectional drawing which shows the step S2 of the flowchart shown in FIG. It is sectional drawing which shows the step S3 of the flowchart shown in FIG. It is a figure which shows an example of the mode of assembling a magnet using the rotor manufacturing apparatus shown in FIG. It is a figure which shows the other example of the aspect of assembling a magnet using the rotor manufacturing apparatus shown in FIG. 2. It is a flowchart explaining the manufacturing method of the rotor using the rotor manufacturing apparatus of the comparative example.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified.

In the following description, the extending direction of the central axis of the rotor is the axial direction, the direction extending radially from the center of the central axis of the rotor is the radial direction, and the extending direction is circumferentially centered on the central axis of the rotor. The direction is the circumferential direction. It is assumed that the central axes of the rotor and the rotor core are substantially the same. Further, in the drawing, the cross-sectional view is a view showing a part of a cross section cut along the axial direction of the rotor core, and shows a vertical cross section including one magnet insertion hole. Further, in these drawings, the insertion direction of the magnet is indicated by a white arrow.

The configuration of the rotor manufacturing apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2. The rotor manufacturing apparatus according to the present embodiment is provided on the peripheral edge of the open end of at least one magnet insertion hole penetrating in the axial direction of the rotor core, and has a member transport path for passing the magnet inserted into the magnet insertion hole in the axial direction. , A magnetizing device that forms a magnetic field that magnetizes a magnet in the member transport path, and a transport means that transports the magnet that has passed through the member transport path with the magnet sandwiched from the axial direction into the magnet insertion hole. ..

The rotor 1 manufactured by the rotor manufacturing apparatus 100 according to the present embodiment is, for example, an embedded magnet type rotor 1. The rotor 1 has a rotor core 2 and a rotor shaft. The rotor core 2 is formed by laminating an annular electromagnetic steel sheet. The rotor core 2 has a shaft hole and a plurality of magnet insertion holes 2h. The shaft hole is arranged substantially in the center of the electromagnetic steel sheet when viewed from the stacking direction of the electromagnetic steel sheet. The plurality of magnet insertion holes 2h are arranged at equal angular intervals in the circumferential direction in the vicinity of the outer peripheral edge of the rotor core 2.

Both the shaft hole and the magnet insertion hole 2h extend in the laminating direction of the electrical steel sheets so as to penetrate in the axial direction of the rotor core 2. Permanent magnets are inserted and fixed in the plurality of magnet insertion holes 2h, respectively. A rotor shaft is inserted and fixed in the shaft hole. The rotor 1 is configured in this way.

As the magnet 10 for forming the permanent magnet provided in the rotor 1, for example, a material made of ferrite, samarium, cobalt, neodymium or the like can be used. The magnet 10 has a columnar shape that can be inserted into the magnet insertion hole 2h, and has a long axis in the axial direction. The magnet 10 becomes a permanent magnet when magnetized by applying a magnetic flux equal to or higher than the saturation magnetic flux density from the outside.

In the present embodiment, magnetism is applied to the unmagnetized magnet 10 by magnetizing the magnet 10 using the magnetizing device 20 outside the rotor 1 (rotor core 2). The magnetizing device 20 included in the rotor manufacturing device 100 will be described with reference to FIG. 1. FIG. 1 is a diagram illustrating a magnetizing device of the rotor manufacturing device according to the first embodiment. The magnetizing device 20 mainly has a pair of magnetizing coils 20a and 20b that generate a magnetic field.

The magnetizing device 20 has magnetizing coils 20a and 20b facing each other along the radial direction of the rotor 1 with the magnet insertion hole 2h interposed therebetween. The space formed between the magnetizing coils 20a and 20b is a member transport path P through which the magnet 10 can pass in the axial direction. A magnetic field for magnetizing the magnet 10 is formed in the member transport path P by the magnetizing coils 20a and 20b. The magnet 10 is magnetized by being placed in the magnetic field and becomes a permanent magnet.

The magnetizing coils 20a and 20b are formed in an annular shape by winding a wire rod containing a conductive material such as copper around an iron core (not shown) by a predetermined number of turns. Both ends of each magnetizing coil 20a and 20b are connected in series to a magnetizing power supply (not shown). The magnetizing power supply is, for example, a well-known capacitor type magnetizing power supply. When a current is supplied from the magnetizing power supply, the magnetizing coils 20a and 20b generate a magnetic field according to the magnitude of the supplied current.

The magnetizing coils 20a and 20b are arranged so that the formed annular surfaces are along the axial direction. Further, the magnetizing coils 20a and 20b are wound in a predetermined direction so as to generate a magnetic flux toward one side in the radial direction. For example, the pair of magnetizing coils 20a and 20b facing each other are configured so that the winding directions of the pair of magnetizing coils 20a and 20b are the same when viewed from the same radial direction outside the member transport path P. Will be done. The magnet 10 can be magnetized by the magnetic flux generated by the magnetizing coils 20a and 20b passing through the magnet 10.

In FIG. 1, the magnetic flux line F indicating the direction in which the magnetic flux is directed is indicated by a black arrow. The magnetizing device 20 magnetizes one magnet 10 with respect to a pair of magnetizing coils 20a and 20b in a direction in which the magnetic flux line F faces. In the magnetizing device 20, since the directions of the magnetic fluxes generated by the magnetizing coils 20a and 20b are aligned, the magnetic field strength is strong and the magnetizing efficiency of the magnet 10 is high.

If the magnetizing device 20 has a configuration having a function of reversing the polarity of the current supplied by the magnetizing power supply to the magnetizing coils 20a and 20b, the magnetizing polarity is changed according to the magnet 10 to be magnetized. Can be done. The magnetizing device 20 having such a configuration can arbitrarily set the direction and strength in which the magnetic flux is directed according to the magnetizing target.

The rotor manufacturing apparatus 100 according to the present embodiment has, in addition to the magnetizing apparatus 20 having the above configuration, a conveying means 30 and the like for conveying the magnet 10. FIG. 2 is a cross-sectional view showing a schematic configuration of the rotor manufacturing apparatus according to the first embodiment. As shown in FIG. 2, the rotor manufacturing apparatus 100 further includes a support portion 40, a holding portion 41, and a transport means 30.

The support portion 40 is a pedestal on which the rotor 1 is placed on the upper surface thereof and the rotor 1 is supported from the lower side in the axial direction. The support portion 40 is formed with a hole 40h that penetrates in the axial direction at a position corresponding to the magnet insertion hole 2h in a state where the rotor 1 is placed. The hole 40h is configured to be smaller than the outer shape of the magnet 10.

The lower surface of the holding portion 41 abuts on the upper end surface of the rotor core 2. The holding portion 41 is formed with a hole 41h penetrating in the axial direction at a position corresponding to the magnet insertion hole 2h in a state of being in contact with the rotor core 2. The hole 41h has the same size as the outer circumference of the open end of the magnet insertion hole 2h, or is smaller than the outer circumference. Further, the hole 41h is configured to be larger than the outer shape of the magnet 10, and the magnet 10 can pass through the hole 41h in the axial direction.

Further, the magnetizing coils 20a and 20b of the magnetizing device 20 are arranged on the upper surface of the holding portion 41. The magnetizing coils 20a and 20b are preferably arranged along the peripheral edge of the open end of the magnet insertion hole 2h. In the present embodiment, as described above, the magnetizing coils 20a and 20b are arranged so as to face each other with the magnet insertion hole 2h interposed therebetween.

Further, in the following description, the magnetizing coils 20a and 20b will be described as being arranged so as to face each other along the radial direction of the rotor 1. The magnetizing coils 20a and 20b may be fixed to the holding portion 41 or may be detachably provided on the holding portion 41. In the following description, the magnetizing coils 20a and 20b will be described as being fixed to the holding portion 41.

The support portion 40 and the holding portion 41 sandwich the rotor core 2 from the axial direction. When the support portion 40 and the holding portion 41 sandwich the rotor core 2, the central axis A extending in the axial direction through the center in the horizontal cross section of the magnet insertion hole 2h, and the hole 40h and the holding portion 41 of the support portion 40. Align each center axis extending axially through each center in each horizontal cross section of the hole 41h so as to coincide with each other. The support portion 40 and the holding portion 41 prevent the relative misalignment between the magnet insertion hole 2h and the magnet 10. The support portion 40 and the holding portion 41 are made of a non-magnetic metal material, resin, or the like so as not to interfere with the magnetism of the magnet 10.

The transport means 30 has a first clamp 30a and a second clamp 30b. The first clamp 30a and the second clamp 30b are arranged on the central axis A. The first clamp 30a and the second clamp 30b are columnar members that can be inserted along the axial direction into the magnet insertion hole 2h and the member transfer path P. The first clamp 30a and the second clamp 30b are provided so as to be able to move up and down along the axial direction by an actuator (not shown).

The first clamp 30a abuts on the upper end surface of the magnet 10 from above in the axial direction. Further, the second clamp 30b abuts on the lower end surface of the magnet 10 from below in the axial direction while being inserted into the hole 40h formed in the support portion 40. The first clamp 30a and the second clamp 30b are made of a non-magnetic metal material, resin, or the like so as not to interfere with the magnetism of the magnet 10.

By having such a configuration, the transporting means 30 can move the magnet 10 up and down along the central axis A with the first clamp 30a and the second clamp 30b sandwiching the magnet 10 from the axial direction. can. The magnet 10 conveyed by the conveying means 30 descends from above the member conveying path P, and is inserted into the magnet insertion hole 2h immediately after passing through the member conveying path P and the hole 41h of the holding portion 41. Since the member transport path P, the hole 41h, and the magnet insertion hole 2h communicate with each other along the central axis A, the magnetized portion of the magnet 10 is not spaced in time and distance. It is inserted into the magnet insertion hole 2h.

As described above, in the rotor manufacturing apparatus 100 according to the present embodiment, the magnetizing position of the magnet 10 is provided immediately before the magnet insertion port, and the region where the magnetic field for magnetizing the magnet 10 is generated is the magnet insertion hole 2h. Since it communicates with the magnet 10, the magnet 10 can be continuously magnetized and inserted.

FIG. 3 is a flowchart illustrating a method of manufacturing a rotor using the rotor manufacturing apparatus according to the first embodiment. As shown in FIG. 3, the method for manufacturing a rotor according to the present embodiment includes the steps S1 to S3. In step S1, the unmagnetized magnet 10 is set in the transport means 30. In step S2, the magnet 10 is magnetized while being conveyed toward the magnet insertion hole 2h. In step S3, the magnet 10 is inserted into the magnet insertion hole 2h.

Subsequently, each step described with reference to FIG. 3 will be described in detail with reference to FIGS. 4 to 6. FIG. 4 is a cross-sectional view showing step S1 of the flowchart shown in FIG. FIG. 5 is a cross-sectional view showing step S2 of the flowchart shown in FIG. FIG. 6 is a cross-sectional view showing step S3 of the flowchart shown in FIG.

As shown in FIG. 4, in step S1, the rotor 1 is placed on the support portion 40, and the pressing portion 41 is brought into contact with the upper end surface of the rotor core 2. At this time, the magnetizing coils 20a and 20b are arranged so as to face each other along the radial direction on the peripheral edge of the open end of the magnet insertion hole 2h via the holding portion 41.

Then, the unmagnetized magnet 10 is sandwiched from the axial direction by the first clamp 30a and the second clamp 30b above the member transport path P formed between the magnetizing coils 20a and 20b. As a result, the unmagnetized magnet 10 is set in the transport means 30. At this time, the magnet 10, the first clamp 30a, and the second clamp 30b are arranged on the central axis A of the magnet insertion hole 2h.

Further, in the magnetizing device 20, a current is supplied from the magnetizing power supply to the magnetizing coils 20a and 20b to form a magnetic field for magnetizing the magnet 10 in the member transport path P. For example, the magnetic field generated by the magnetizing coils 20a and 20b is set to give a saturated magnetic field to one magnet 10.

Subsequently, as shown in FIG. 5, in step S2, the first clamp 30a and the second clamp 30b are lowered along the central axis A by operating the actuator of the transport means 30. Along with this, the magnet 10 descends along the central axis A.

As shown in S2-1 to S2-3 of FIG. 5, the magnet 10 passes downward through the member transport path P, and at the same time, is placed in a magnetic field generated by the magnetizing coils 20a and 20b. As a result, the magnetic flux generated by the magnetizing coils 20a and 20b passes through the magnet 10 in the radial direction. The portion of the magnet 10 through which the magnetic flux has passed is sequentially magnetized. After passing through the member transport path P, the magnetized portion of the magnet 10 passes through the hole 41h of the holding portion 41 and enters the magnet insertion hole 2h as it is. Of the magnet 10, at least the portion that has entered the magnet insertion hole 2h constitutes a magnetized permanent magnet. In this way, while the magnet 10 is conveyed toward the magnet insertion hole 2h, the magnet 10 is magnetized immediately before the magnet 10 enters the magnet insertion hole 2h.

When the lower end of the magnet 10 enters the magnet insertion hole 2h, a magnetic force acts between the magnet 10 and the rotor core 2, and an attractive force or a repulsive force that attracts the magnet 10 into the magnet insertion hole 2h is generated. On the other hand, in the present embodiment, the speed at which the first clamp 30a and the second clamp 30b move up and down is controlled, and the insertion work of the magnet 10 is not hindered by the attractive force or the repulsive force due to the magnetic force.

As a method of magnetizing the magnet 10, each step S2-1 to S2-3 in which the magnet 10 passes through the member transport path P may be continuously performed as described above, and each step S2-1 to S2-3 may be performed continuously. The magnet 10 may be magnetized in a plurality of times by stopping the descent of the magnet 10 each time and applying a magnetic field at the timing of the stop. Alternatively, the transfer of the magnet 10 may be temporarily stopped while the entire magnet 10 is arranged so as to be present in the magnetic field, and the entire magnet 10 may be magnetized together at one position.

Subsequently, as shown in FIG. 6, in step S3, by continuing the operation of step S2, the magnet 10 in a fully magnetized state is inserted to a predetermined position in the magnet insertion hole 2h. The magnet 10 is magnetized so that the upstream side in the direction in which the magnetic flux line F faces is the N pole and the downstream side is the S pole. When the magnet 10 reaches a predetermined position in the magnet insertion hole 2h, the first clamp 30a rises to release the pinching of the magnet 10. As a result, the insertion of the magnet 10 into the magnet insertion hole 2h is completed.

Next, with reference to FIGS. 7 and 8, a mode in which the magnet 10 is assembled to the rotor 1 according to the above flow will be described with reference to an example. FIG. 7 is a diagram showing an example of a mode in which a magnet is assembled using the rotor manufacturing apparatus shown in FIG. 2. FIG. 8 is a diagram showing another example of assembling a magnet using the rotor manufacturing apparatus shown in FIG. 2.

Note that FIGS. 7 and 8 schematically show a rotor 1 in which four magnet insertion holes 2h are arranged in the circumferential direction of 45 ° and a magnet 10 is mounted in each of the magnet insertion holes 2h. Is. However, the arrangement and quantity of the magnet insertion holes 2h and the magnets 10 in the rotor 1 are not limited to the examples of FIGS. 7 and 8, and are appropriately designed. Further, FIGS. 7 and 8 show only the rotor 1 including the rotor core 2 when viewed from above in the axial direction, the magnet insertion hole 2h, the magnet 10, and the magnetizing coils 20a and 20b.

In the example shown in FIG. 7, the magnetizing coils 20a and 20b and the conveying means 30 are provided in a quantity corresponding to the number of magnet insertion holes 2h. In this case, the magnetizing device 20 is configured to be able to supply a current to the four pairs of magnetizing coils 20a and 20b at the same time. According to such a configuration, a series of flows from magnetizing a plurality of magnets 10 to inserting them into the corresponding magnet insertion holes 2h are simultaneously performed without any time and distance intervals. Can be done. Therefore, the magnetizing time can be shortened.

In the example shown in FIG. 8, the magnetizing coils 20a and 20b and the conveying means 30 are provided for one of the four magnet insertion holes 2h. Further, the rotor 1 is rotatably held around the central axis (circumferential direction) of the rotor 1. Instead of rotating the rotor 1, the magnetizing coils 20a and 20b and the conveying means 30 may be moved around the central axis of the rotor 1. That is, the example shown in FIG. 8 has a configuration in which the rotor 1 and the magnetizing coils 20a and 20b are relatively rotated (moved).

In this case, the rotor 1 and the magnetizing coils 20a and 20b are relative to each other by 45 ° each time a series of flows from magnetizing one magnet 10 to being inserted into the magnet insertion hole 2h corresponding to the magnet 10 are completed. Move to the target. As the rotor 1 rotates, the magnetizing coils 20a and 20b and the conveying means 30 move from the magnetizing position shown in FIG. 8 to the magnetizing position corresponding to one of the magnet insertion holes 2h adjacent in the circumferential direction. Will be installed in. Then, according to the flow shown in FIG. 3, the magnet 10 is magnetized and the magnet 10 is inserted into the magnet insertion hole 2h. The above operation is repeated for all the magnets 10 and all the magnet insertion holes 2h over the entire circumference of the rotor 1.

According to such a configuration, the magnetized magnets 10 can be inserted into all the magnet insertion holes 2h by repeating the relative movement between the rotor 1 and the magnetizing coils 20a and 20b. With such a configuration, the device can be miniaturized and the cost can be reduced.

Here, a case where the rotor manufacturing apparatus of the comparative example is used with reference to FIG. 9 will be described. FIG. 9 is a flowchart illustrating a method of manufacturing a rotor using the rotor manufacturing apparatus of the comparative example. The rotor manufacturing apparatus of the comparative example is configured to magnetize the magnet 10 outside the rotor 1, transport the magnetized magnet 10 above the magnet insertion hole 2h, and then insert the magnetized magnet 10 into the magnet insertion hole 2h. ..

The rotor manufacturing apparatus of the comparative example configured as described above mainly includes magnetizing equipment, transfer equipment, and magnet insertion equipment. The magnetizing equipment is equipment having a function of magnetizing an unmagnetized magnet 10. The transport equipment is a facility having a function of transporting the magnet 10 from the magnetizing facility to the magnet insertion facility. The magnet insertion equipment is equipment having a function of inserting the magnet 10 into the magnet insertion hole 2h.

As shown in FIG. 9, in the method of manufacturing a rotor using the rotor manufacturing apparatus of the comparative example, first, the magnet 10 is magnetized (step S101). In step S101, the unmagnetized magnet 10 is set in the magnetizing equipment, and the magnet 10 is magnetized. Since the magnetizing equipment is installed at a place away from the rotor 1, it is necessary to convey the magnetized magnet 10 to the rotor 1.

Next, the magnet 10 is set in the transport equipment and the magnet 10 is transported (step S102). In step S102, the magnet 10 magnetized in step S101 is set in the transport equipment. The magnetized magnet 10 is conveyed above the magnet insertion hole 2h of the rotor 1 by the conveying equipment.

Then, the magnet 10 is set in the magnet insertion equipment, and the magnet 10 is inserted into the magnet insertion hole 2h (step S103). In step S103, the magnet 10 conveyed in step S102 is set in the magnet insertion equipment. The magnet insertion equipment lowers the magnet 10 arranged above the magnet insertion hole 2h, and inserts the magnetized magnet 10 into the magnet insertion hole 2h.

As described in the above flow, in the rotor manufacturing apparatus of the comparative example, a magnetizing assembly method in which a magnet 10 magnetized in advance outside the rotor 1 is assembled to the rotor core 2 can be performed. However, when the rotor manufacturing apparatus of the comparative example is used, iron powder or the like adheres to the surface of the magnet 10 in the process of transporting the magnetized magnet 10, and foreign matter is attached to the rotor 1 manufactured by assembling the magnet 10. May be mixed in. Further, foreign matter adhering to the surface of the magnet 10 may make it difficult to insert the magnet into the magnet insertion hole 2h.

Further, when the magnetized magnet 10 is inserted into the magnet insertion hole 2h, the assembling work may be difficult due to the repulsive force and the attractive force of the magnetized magnet 10. At this time, great care must be taken in handling so that the magnet 10 is not damaged. Therefore, when the rotor 1 is manufactured by using the rotor manufacturing apparatus of the comparative example, the workability is lowered.

In order to avoid these, the unmagnetized magnet 10 is inserted into the magnet insertion hole 2h and assembled to the rotor 1, and then magnetized from the outside of the rotor using a magnetizing device having a magnetizing yoke. The method is used. Such a magnetizing device includes, for example, an annular magnetizing yoke having a plurality of teeth arranged in the circumferential direction, and a magnetizing coil wound around the teeth. The magnetizing device can magnetize the unmagnetized magnet 10 by the magnetic field generated by supplying an electric current to the magnetizing coil with the rotor 1 installed in the magnetizing yoke.

In order to improve the performance of the motor, it is necessary to assemble a magnet 10 having a stronger magnetic force with respect to the rotor 1. However, as described above, in the magnetizing device that magnetizes from the outside of the rotor 1, the magnet 10 is used. It is necessary to generate a very large magnetic field in order to sufficiently magnetize. Therefore, in such a magnetizing device, it is necessary to increase the number of turns of the magnetizing coil or supply a large current to the magnetizing coil. This causes a problem that the size of the device increases and the manufacturing cost increases.

Further, since the magnetic field strength that can be applied from the outside of the rotor 1 is limited, when the magnetic resistance when applying the magnetic field to the magnet 10 is large, the magnetic field applied to the unmagnetized magnet 10 weakens, and the magnet 10 There was a problem that the magnetizing rate of the magnet was lowered. When the magnetism rate of the magnet 10 is low, the rotor 1 tends to be demagnetized, and as a result, it may cause a decrease in the efficiency of the motor and a noise generation during rotation of the motor.

On the other hand, the rotor manufacturing apparatus 100 according to the present embodiment includes a magnetizing apparatus 20 including magnetizing coils 20a and 20b that generate a magnetic field for magnetizing the magnet 10 in a member transport path P formed between the rotors 100. Have. The magnetizing device 20 can magnetize the magnet 10 by arranging the unmagnetized magnet 10 in the member transport path P.

Further, the rotor manufacturing apparatus 100 according to the present embodiment has a transporting means 30 for transporting the magnet 10 into the magnet insertion hole 2h so as to pass through the member transport path P. The magnetizing coils 20a and 20b are provided so that the member transport path P and the magnet insertion hole 2h communicate with each other via the holding portion 41. As a result, the magnetized magnet 10 can be inserted into the magnet insertion hole 2h without any time and distance interval.

According to the rotor manufacturing apparatus according to the present embodiment, it is possible to suppress foreign matter from adhering to the magnet surface when assembling the magnet, and to reduce the possibility of foreign matter being mixed into the rotor. Further, since the transport mechanism is used, the magnet can be safely and surely inserted into the magnet insertion hole without being hindered by the repulsive force and attractive force of the magnetized magnet. Therefore, workability is good.

Further, according to the rotor manufacturing apparatus according to the present embodiment, since the magnet is magnetized independently before assembling the magnet to the rotor, it is possible to apply a strong magnetic field to the magnet while suppressing the enlargement of the magnetizing apparatus. It is possible. Therefore, the magnetizing rate of the magnet can be improved. As a result, the rotor manufactured by using the rotor manufacturing apparatus according to the present embodiment is provided with a permanent magnet having a stronger magnetic force, so that it is difficult to demagnetize and it is possible to suppress a decrease in motor efficiency. Therefore, the performance of the motor can be improved.

1 Rotor 2 Rotor core 2h Magnet insertion hole 10 Magnet 20 Magnetizing device 20a, 20b Magnetizing coil 30 Conveying means 30a First clamp 30b Second clamp 40 Support part 40h Hole 41 Holding part 41h Hole 100 Rotor manufacturing equipment A Center axis F Magnetic flux line P Member transport path

Claims (1)

A member transport path provided on the peripheral edge of the open end of at least one magnet insertion hole penetrating in the axial direction of the rotor core and allowing a magnet to be inserted into the magnet insertion hole to pass axially is provided, and the magnet is placed in the member transport path. A magnetizing device that forms a magnetic field to be magnetized,
A transporting means for transporting the magnet, which has passed through the member transport path with the magnet sandwiched from the axial direction, into the magnet insertion hole.
Rotor manufacturing equipment.

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