JP2004336927A - Apparatus and method for manufacturing rotor of electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing the rotor of an electric motor which can manufacture the rotor in which a magnet is strongly fixed in a magnet insertion hole and which can certainly pass magnetic flux. <P>SOLUTION: The apparatus for manufacturing the rotor of the electric motor includes a cover 2 for holding the magnet 6 at a position corresponding to the magnet insertion hole 5a of the rotor core 5, and a push holder 4 for inserting the magnet 6 held by the cover 2 into the magnet insertion hole 5a by moving the magnet 6 into the rotor core 5. The push holder 4 inserts the magnet 6 held by the cover 2 into the magnet insertion hole 5a of the rotor core 5 in a state that the push holder 4, the rotor core 5 and the cover 2 are rotated at the shaft 5b of the rotor core 5 as a center at the same rotational speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for manufacturing a motor rotor, and more particularly to a technique for easily inserting a magnet into a magnet insertion hole of a rotor core.
[0002]
[Prior art]
Generally, a plurality of magnets are embedded in a rotor core used for a motor rotor, and it is necessary to insert magnets into a plurality of magnet insertion holes formed in the rotor core in a manufacturing process. .
[0003]
FIG. 10A is a configuration diagram of the rotor core 101, and FIG. 10B is an explanatory diagram showing a state where the magnet 103 is inserted into the magnet insertion hole 102. As shown in FIG. In the method of manufacturing the secondary core, the width of the magnet insertion hole 102 is set to be about 100 [μm] larger than the width of the magnet 103 in order to insert the magnet 103 into the magnet insertion hole 102. An adhesive is applied to the gap portion of the magnet insertion hole caused by the difference between the two, or described in JP-A-2000-341920 (Patent Document 1) and JP-A-2000-175388 (Patent Document 2). Thus, a method of inserting a spring has been adopted.
[0004]
That is, in the method of applying the adhesive to the gap, as shown in FIG. 9A, the adhesive is applied to the magnet 103, and then the magnet 103 is inserted into the magnet insertion hole 102 of the rotor core 101, Allow the adhesive to cure. In the method of inserting a spring, as shown in FIG. 2B, the spring is inserted into the magnet insertion hole 102, and then the magnet 103 is inserted, and the magnet 103 is firmly fixed by the elastic force of the spring. I do.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-341920
[Patent Document 2]
JP 2000-175388 A
[Problems to be solved by the invention]
However, in the method of applying the adhesive described above, an adhesive layer is formed between the magnet 103 and the magnet insertion hole 102, and in the method of inserting a spring, the adhesive between the magnet 103 and the magnet insertion hole 102 is formed. Since a layer of air is formed in between, there has been a problem that the magnetic flux is difficult to pass through.
[0008]
The present invention has been made in order to solve such a conventional problem, and an object thereof is to firmly fix a magnet in a magnet insertion hole, and to reliably pass a magnetic flux. An object of the present invention is to provide a motor rotor manufacturing apparatus and a manufacturing method capable of manufacturing a rotor.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a motor rotor including a rotor core having a magnet insertion hole extending in the rotation axis direction of the rotor, and a magnet inserted into the magnet insertion hole of the rotor core. A manufacturing apparatus for manufacturing, wherein a magnet holding means for holding a magnet at a position corresponding to a magnet insertion hole of the rotor core, and the magnet held by the magnet holding means is moved into the rotor core to move the magnet. And a magnet insertion means for inserting the magnet insertion hole into the magnet insertion hole, wherein the magnet insertion means, the magnet insertion means, the rotor core, and the magnet holding means, about the rotation axis of the rotor and the same The magnet held by the magnet holding means is inserted into a magnet insertion hole of the rotor core while being rotated at a rotation speed.
[0010]
【The invention's effect】
In the motor rotor manufacturing apparatus and method according to the present invention, the magnet is held by the elastic force of the magnet insertion hole formed in the rotor core. Can be omitted, the number of steps for fixing the magnet can be reduced, and the efficiency and cost of the operation can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a state in which a rotor core is attached to a motor rotor manufacturing apparatus according to one embodiment of the present invention, FIG. 2 (a) is a cross-sectional view, and FIG. It is AA sectional drawing shown to figure (a).
[0012]
As shown in the drawing, the motor rotor manufacturing apparatus includes a housing 1 that covers a rotor core 5 into which a magnet is to be inserted, covers 2 and 3 provided before and after the housing 1, and a pressing jig 4. Have. The cover 3, the housing 1, and the cover 2 can be fixed to each other by fastening bolts (not shown).
[0013]
The rotor core 5 is used, for example, for a rotor of a driving motor mounted on a vehicle, and is formed by laminating thin plates made of a disk-shaped silicon steel plate or the like. A shaft 5b serving as a rotating shaft of the electric motor is fixed to the center of the rotor core 5 by shrink fitting or the like. Further, magnet insertion holes 5a for inserting the magnets 6 are provided at a plurality of locations (four locations in the figure, which are examples of a quadrupole rotor) of the rotor core 5.
[0014]
The cover 3 is provided with a shaft 3a at the center, and the shaft 3a is spline-coupled to one end of a shaft 5b provided on the rotor core 5. That is, a spline is formed on the shaft 3a, and a fitting hole 5c that fits with the spline is formed on one end of the shaft 5b, and these are connected.
[0015]
The cover (magnet holding means) 2 is provided with a shaft 2a at the center, and the shaft 2a is spline-coupled to a fitting hole 5c at the other end of the shaft 5b provided on the rotor core 5. . A plurality of (four in the figure) magnet holding holes 2b are formed in the outer peripheral portion of the cover 2 and are inserted into the magnet insertion holes 5a of the rotor core 5 in the magnet holding holes 2b. Is held.
[0016]
Further, the outer peripheral side surface 2b1 of the magnet holding hole 2b of the cover 2 is substantially the same as the outer peripheral side surface 5a1 of the magnet insertion hole 5a of the rotor core 5, with the shaft 2a of the cover 2 connected to the shaft 5c of the rotor core 5. It is provided at a position to be a plane.
[0017]
The pushing jig (magnet insertion means) 4 is made of a highly rigid material such as iron, and has a disk-shaped base 4a having a through hole 4c for inserting the shaft 2a in the center, and a cover from the base 4a. A plurality of (four in the figure) projections 4b are formed on the rotor core 5 side and press the magnet 6 held in the magnet holding hole 2b toward the rotor core 5 side. The protrusion 4b has substantially the same length as the magnet holding hole 2b.
[0018]
FIG. 3 is an explanatory diagram showing a positional relationship among a magnet holding hole 2 b provided in the cover 3, a magnet 6 held in the magnet holding hole 2 b, and a magnet insertion hole 5 a formed in the rotor core 5. is there. As shown in the figure, the magnet holding hole 2b has a substantially rectangular shape, and its horizontal width (longitudinal width) is L2 and its vertical width (short width) is h2. Is L1, and the vertical width is h1. A gap of 100 [μm] is formed in each of the longitudinal direction and the lateral direction of the magnet holding hole 2b. That is, L2 = L1 + 100 [μm] and h2 = h1 + 100 [μm].
[0019]
Further, the magnet insertion hole 5a formed in the rotor core 5 is formed to have a wide outer peripheral side (a portion spread in a triangular shape in the figure), and has a horizontal width L and a vertical width h3. The vertical width h3 is equal to or smaller than the vertical width h1 of the magnet 6, that is, h3 ≦ h1.
[0020]
Next, the procedure for inserting the magnet 6 into the magnet insertion hole 5a of the rotor core 5 using the motor rotor manufacturing apparatus configured as described above will be described with reference to FIGS. 8 and the flowchart shown in FIG.
[0021]
The procedure for assembling the rotor core 5 in the housing 1 will be described. First, the cover 2 and the housing 1 shown in FIG. 1 are fixed by bolting. Thereafter, the rotor core 5 is inserted into the insertion hole 1a of the housing 1 (see FIG. 2A), and the shaft 5b of the rotor core 5 and the shaft 2a provided on the cover 2 are spline-coupled.
[0022]
Next, after the shaft 3a of the cover 3 and the shaft 5b of the rotor core 5 are spline-coupled and the cover 3 is assembled, the cover 3 and the housing 1 are fixed by bolting. This completes the mounting of the rotor core 5 in the housing 1 as shown in FIG.
[0023]
Thereafter, the magnet 6 is inserted into the magnet holding hole 2b of the cover 2 as shown in FIG. Then, as shown in FIG. 2C, the protrusion 4b of the pressing jig 4 is inserted into the magnet holding hole 2b of the cover 2 and an external force is applied so as to press the magnet 6 toward the rotor core 5. At this time, the vertical width h3 (see FIG. 3) of the magnet insertion hole 5a of the rotor core 5 is equal to or less than the thickness dimension h1 of the magnet 6 (h3 ≦ h1). It is not inserted into 5a.
[0024]
In this state, as shown in FIG. 8D and step S1 in FIG. 8, the shaft 2a of the cover 2 is rotated using a driving motor (not shown) at a normal rotation speed (for example, for driving a vehicle). When used as a motor, the motor is rotated at a rotation speed higher than the rotation speed when mounted on a vehicle. Then, the rotor core 5 and the cover 3 connected to the shaft 2a rotate together.
[0025]
Note that the rotation direction at this time is desirably the direction in which the rotor core normally rotates (when used as a vehicle drive motor, the direction in which the rotor core rotates toward the forward side of the vehicle).
[0026]
This causes a centrifugal force to act on the rotor core 5 as shown in FIG. 5, so that the magnet insertion holes 5 a formed in the outer peripheral portion of the rotor core 5 are centrifuged as shown in FIG. Due to the force, the width in the vertical direction is increased, and becomes larger than the vertical width h3 of the magnet. In this state, as shown in FIG. 4D and step S2 in FIG. 8, when the protrusion 4b of the pressing jig 4 is pressed against the cover 2, the magnet 6 is inserted into the magnet insertion hole 5a of the rotor core 5. Inserted.
[0027]
At this time, if there is a possibility that the magnet insertion hole 5a of the rotor core 5 expands due to centrifugal force and is broken, the inner diameter of the cylindrical housing 1 (the diameter of the core insertion hole 1a shown in FIG. 2A). Is smaller than the sum of the diameter of the rotor core 5 at rest and the deformation (critical deformation) at which the magnet insertion hole 5a is damaged, that is, the dimension S1 shown in FIG. By setting the deformation amount to be equal to or less than the deformation amount at which the rotor core 5a is damaged, it is possible to prevent the rotor core 5 from being damaged by deformation due to centrifugal force.
[0028]
After that, when the insertion of the magnet 6 into the magnet insertion hole 5a is confirmed, the rotation of the shaft 2a is stopped and the external force applied to the projection 4b of the pushing jig 4 as shown in step S3 of FIG. To stop. In addition, as a method of confirming that the magnet 6 has been inserted, an operator may visually confirm that the pushing jig 4 has come into contact with the cover 2, or when the pushing jig 4 comes into contact with the cover 2. The rotation may be automatically stopped by using a switch that is turned on.
[0029]
Then, when the rotation is stopped, the magnet insertion hole 5a expanded by the centrifugal force returns to the original vertical width as shown in FIG. 6 (b). Fixed to.
[0030]
Next, the amount of deformation of the magnet insertion hole 5a when the rotor core 5 is actually rotated will be described. FIG. 7 is an explanatory diagram showing experimental result data of the deformation amount of the magnet insertion portion 5a. For example, the outer diameter D of the core is φ250 [mm], the lateral width Lp of the magnet insertion hole 5a is 27 [mm], and the height h of the bridge portion (height when not deformed; see FIG. 6B). In the case of the rotor core 5 of 1 [mm], assuming that the magnet outer shape is larger than the magnet insertion hole 5a by 20 [μm], when the rotation speed is 16000 [rpm], the rotation is 120 [μm] or more. (That is, the deformation amount v2 becomes 120 [μm] or more), and it is confirmed that a gap of 100 [μm] or more required for the conventional magnet insertion is generated.
[0031]
In addition, when the interference between the magnet 6 and the rotor core 5 is 20 [μm], it can be used at a normal rotation speed (the rotation speed when mounted on a vehicle) of 4000 [rpm] or less. That is, the deformation amount v1 is 20 [μm] or less.
[0032]
In this manner, in the motor rotor manufacturing apparatus and the manufacturing method according to the present embodiment, the magnet 6 is held by the elastic force of the magnet insertion hole 5a formed in the rotor core 5, so that, as in the related art, The operation of applying the adhesive and the operation of inserting the spring can be omitted, and the steps of the operation of fixing the magnet can be significantly reduced. Thereby, work efficiency and cost reduction can be achieved.
[0033]
Further, when the electric motor using the rotor core 5 is operated, the magnet 6 and the rotor core 5 are in close contact with each other, so that the magnetic flux can easily pass through, and the rotation performance can be improved.
[0034]
Furthermore, by designing the inner diameter of the housing 1 to be smaller than the critical deformation amount of the rotor core 5, the rotor core 5 is damaged by centrifugal force of rotation when the magnet 6 is inserted into the magnet insertion hole 5a. It is possible to avoid the occurrence of a trouble of performing.
[0035]
Moreover, if the manufacturing apparatus of the motor rotor according to the present embodiment is used for manufacturing a rotor core used for a motor for a vehicle, the rotational performance of the motor for a vehicle can be improved.
[0036]
The apparatus and method for manufacturing a motor rotor according to the present invention have been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each part may be any configuration having the same function. Can be replaced with
[0037]
For example, in the present embodiment, the rotor of the motor for driving the vehicle has been described as an example of the rotor core. However, the present invention is not limited to this, and can be applied to other electric motors. It is.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a configuration of a motor rotor manufacturing apparatus according to an embodiment of the present invention.
2A is a cross-sectional view of a motor rotor manufacturing apparatus according to one embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing a positional relationship among a magnet holding hole, a magnet insertion hole, and a magnet held in the magnet holding hole.
FIG. 4 is an explanatory diagram showing a procedure for inserting a magnet into a magnet insertion hole.
FIG. 5 is an explanatory diagram showing a state when a centrifugal force due to rotation is applied to a rotor core.
6A and 6B are explanatory diagrams of a magnet inserted into a magnet insertion hole, wherein FIG. 6A illustrates a state where a centrifugal force is applied, and FIG. 6B illustrates a state where the magnet is stationary.
FIG. 7 is an explanatory diagram showing a relationship between a rotation speed of a rotor core and an amount of deformation.
FIG. 8 is a flowchart showing a manufacturing procedure of a method for manufacturing a motor rotor according to the present invention.
FIG. 9 is a flowchart showing a manufacturing procedure of a conventional method for manufacturing a motor rotor, in which (a) shows a case where an adhesive is applied, and (b) shows a case where a spring is inserted.
10A is an explanatory view showing a conventional rotor core, and FIG. 10B is an explanatory view showing a state when a magnet is inserted into a magnet insertion hole of the rotor core.
[Explanation of symbols]
Reference Signs List 1 housing 1a insertion hole 2 cover (magnet holding means)
2a shaft 2b magnet holding hole 3 cover 3a shaft 4 pushing jig (magnet insertion means)
4a Base 4b Projection 4c Through-hole 5 Rotor core 5a Magnet insertion hole 5b Shaft 6 Magnet

Claims (6)

A manufacturing device for manufacturing a motor rotor including a rotor core having a magnet insertion hole extending in a rotation axis direction of the rotor and a magnet inserted into the magnet insertion hole of the rotor core,
Magnet holding means for holding a magnet at a position corresponding to the magnet insertion hole of the rotor core,
Magnet insertion means for moving the magnet held by the magnet holding means into the rotor core and inserting the magnet into the magnet insertion hole,
The magnet insertion means,
With the magnet insertion means, the rotor core, and the magnet holding means rotated about the rotation axis of the rotor at the same rotation speed, the magnet held by the magnet holding means is rotated. An apparatus for manufacturing a motor rotor, which is inserted into a magnet insertion hole of the rotor core. The apparatus for manufacturing a motor rotor according to claim 1,
An apparatus for manufacturing a motor rotor, wherein at least two of the rotor core, the magnet holding means, and the magnet insertion means are fixable to each other. An apparatus for manufacturing a motor rotor according to any one of claims 1 and 2,
The electric motor is a motor for driving a vehicle,
An apparatus for manufacturing a motor rotor, wherein the number of rotations of the rotor core when inserting the magnet into the magnet insertion hole is higher than the number of rotations when the motor drives a vehicle. A rotor core having a magnet insertion hole extending in a rotation axis direction of the rotor, and a manufacturing method for manufacturing an electric motor rotor including a magnet inserted into the magnet insertion hole of the rotor core,
The rotor core, magnet holding means holding a magnet at a position corresponding to the magnet insertion hole, and magnet insertion means for moving and holding the magnet held by the magnet holding means in the direction of the magnet insertion hole. , At the same rotational speed,
In a state where the rotor core is deformed to the outer peripheral side by centrifugal force of rotation, a step of inserting the magnet held by the magnet holding means into the magnet insertion hole of the rotor core by the magnet insertion means,
A method for manufacturing a motor rotor, comprising: The method for manufacturing a motor rotor according to claim 4,
A method for manufacturing a motor rotor, wherein at least two of the rotor core, the magnet holding means, and the magnet insertion means are fixable to each other. A method for manufacturing a motor rotor according to claim 4 or claim 5,
The electric motor is a motor for driving a vehicle,
A method of manufacturing an electric motor rotor, wherein the rotational speed of the rotor core when inserting the magnet into the magnet insertion hole is higher than the rotational speed when the electric motor drives a vehicle.

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