JPH0423497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a rotor for an inner rotor type motor having a laminated core.

[Prior Art] Conventionally, in order to manufacture a laminated core constituting the armature of a rotating electric machine, as shown in Fig. 1, a central shaft hole 1 and a number of slots equally divided in the circumferential direction are used. A technique is adopted in which a single iron core plate 3 having a shape of 2 is punched out from a thin plate material and laminated with the same angular phase as the punched plate. Furthermore, as shown in FIG. 2, there is also a technique in which the core single plates 3 are shifted by small angles and stacked with the slots inclined at 5° to 30° with respect to the axis.

However, the thickness of the core veneer of the laminated core is uneven due to the deflection of the rolling rolls that occurs during the production of the thin plate material used as the raw material, so the thickness of the core veneer is uneven, so Since the laminated cores are laminated in the same direction with non-uniform plate thicknesses, deviations in stacked thickness occur. In addition, deviations in the stacking thickness due to misalignment and eccentricity between the outer diameter, inner diameter, and slot of the iron core veneer punched using the progressive die deteriorate the parallelism of the armature and cause rotational In some cases, the balance of the rotor becomes uneven due to stack thickness deviations and eccentricity, which causes a decrease in the performance of the rotating electric machine and the generation of abnormal noise, so there is an inconvenience that the balance of the rotor must be corrected.

In order to solve such deviations in the thickness of the laminated core, there is a proposed technique disclosed in Japanese Utility Model Publication No. 1441/1983. According to this proposed technology, half of the laminated cores used in one rotor are alternately turned 180 degrees,
This is to adjust the eccentric thickness of the laminated iron core.

[Problems to be Solved by the Invention] According to the above-mentioned proposed technology, in order to adjust the entire laminated core, the laminated core is turned 180 degrees at half the predetermined thickness of one laminated core. However, the thickness cannot be adjusted in any direction other than the two directions, and in the direction perpendicular to the two directions, the eccentricity and thickness remain unadjusted, resulting in the above stacking. This will leave a state with a thickness deviation.

In addition, in the case of the rotor of an inner rotor type motor, in addition to the problem that the overall rotation is not balanced due to deviation on the shaft hole side, the deviation on the shaft hole side causes distortion and sticking of the rotating shaft when press-fitting it. There are problems with strength etc.

This invention has been made to solve the above-mentioned disadvantages of the prior art, and is aimed at reducing the plate pressure deviation of a single iron core plate caused by non-uniform thickness of the thin plate material to a laminated iron core laminated with the outer diameter as a reference. To provide a method for manufacturing a rotor of an inner rotor type motor having a laminated core which is dispersed in the circumferential direction, has almost no stacked thickness deviation, makes the fixing strength of the rotating shaft uniform, and obtains a well-balanced laminated core. It is in.

[Means for Solving the Problems] A rotor manufacturing method for an inner rotor type motor with a laminated core according to the present invention has a shaft hole into which a rotating shaft is press-fitted and a plurality of core teeth portions, and a plurality of core teeth portions. A method for manufacturing a rotor of an inner rotor type motor having a laminated core made of a plurality of laminated core veneers each having a positioning portion formed therein, comprising: punching out the outer shape of the core veneer one by one from a thin plate material; The core veneers punched one by one are supported one by one with a die using the outer diameter of the punched core veneer as a reference at the same punching angle, and the core veneers supported by the die and the alignment portion are first Therefore, it consists of a step of caulking together with the punching, and a step of press-fitting and fixing the rotary shaft into the shaft hole, and after supporting one iron core veneer with the die and before supporting the next iron core veneer. After rotating the die by an angle corresponding to one slot or several slots about the point symmetry axis of the iron core veneer and laminating the iron core veneers one by one to form a laminated iron core based on the outer diameter, The rotary shaft is press-fitted and fixed into the shaft hole.

[Function] The present invention is a method for manufacturing a rotor for an inner rotor type motor having a shaft hole into which a rotating shaft is press-fitted. The core veneer is supported one by one with a die based on the outer diameter of the core veneer, and the iron core veneer previously supported by the die and the alignment part are swaged along with the punching, and the point symmetry axis of the iron core veneer is 1 After rotating the core by the angle of a slot or several slots and laminating the core veneers one by one to form a laminated core with the outer diameter as a reference, the rotating shaft is press-fitted into the shaft hole and fixed. The veneers are stacked by rotating one by one with the outer diameter as a reference to make the phase different, and the thickness deviation and lamination deviation caused by the influence of the thickness deviation on the core veneer of the laminated material are corrected in the circumferential direction. As a matter of course, it is necessary to uniformly distribute the hole diameter of the rotor's shaft hole, so that when the shaft is press-fitted into the shaft hole in the subsequent process, deviations such as positional deviation absorbed by the shaft hole side can be rotated. Can be used for shaft press fitting. When the rotating shaft is press-fitted into the shaft hole, eccentricity of the rotating shaft and distortion of the rotating shaft can be prevented, and the yield can be improved without bending the rotating shaft. In this way, it is possible to prevent the occurrence of shaft distortion, etc., to securely attach the rotating shaft with uniform fixing strength, and to provide a rotor for an inner rotor type motor with good rotational balance at a high yield.

[Example] Hereinafter, the manufacturing method of the present invention will be specifically described.

The manufacturing method of the present invention is a method for manufacturing a laminated core in a rotor, and the laminated core 12 manufactured is as follows:
As shown in FIG. 5, a plurality of core teeth portions 12a
It is made by laminating a plurality of iron core veneers 10, each having a positioning portion formed in the core teeth portion 12a. That is, the mutual phase shift between the individual core veneers 10 in the laminated core 12 is corrected by the fitting positioning recesses 10a, 10b, 10c as positioning parts provided at the corresponding portions of the core teeth 12a of each core veneer 10. ,10d,10e
are formed, and these fitting positioning recesses 10a,
recessed portions of 10b, 10c, 10d, and 10e;
This is a convex portion formed on the opposite side to the concave portion formed when forming the concave portion, and is configured such that the core veneers 10 before and after being laminated are fitted into each other and caulked to be laminated together. .

Furthermore, FIGS. 3 and 4 show an example of a laminated core manufacturing apparatus S used in the method of the present invention. In FIGS. A cylindrical die that is rotatably arranged on the machine base and supports the iron core veneer, 6 is a die holder that supports the die 5, 7 is a gear provided on the outer periphery of the die 5, and 8 is an indexing device. , reference numeral 9 is an operating gear attached to the output shaft 8a of the indexing device 8, and this operating gear 9 is meshed with the gear 7 on the die 5 side. The cylindrical die 5 has a laminated veneer 10 punched from a thin plate material.
They are pushed in at the same angle, caulked, and stacked.

The indexing device 8 is driven by a shaft coupling 11 connected to a press crankshaft (not shown), and the die 5 is rotated by an angle corresponding to one slot via an operating gear 9 and a gear 7. There is. In FIG. 4, reference numeral 5a indicates an indexing positioning hole, which engages with a protrusion provided on the mold side to determine the indexing position when punching a thin plate material using a die (not shown). It is fixed so that it does not rotate.

Next, a manufacturing method of the present invention using the above-mentioned apparatus S will be explained.

First, the outer shape of the iron core veneer 10 is punched out one by one from a thin plate material by a known means (not shown).

Next, the core veneers that have been punched out one by one are supported one by one with a die 5, with the punching angle unchanged, with the outer diameter of the punched core veneer 10 as a reference.
FIG. 3 is a vertical cross-sectional view of the essential parts of the device S showing the laminated state. In this example, ten iron core veneers 10 are shown in a crimped state. The iron core single plate 10' has through holes 13 instead of fitting and positioning recesses 10a to 10e as positioning parts. Therefore, the lowermost iron core veneer 10' is not crimped with the iron core veneer (not shown) held in front of it.
As described above, the iron core veneers 10 are punched out one by one and supported by the die 5, but after the die 5 supports one iron core veneer 10, before supporting the next iron core veneer 10. Next, the die 5 is rotated by an angle corresponding to one slot or several slots about the point symmetry axis of the iron core veneer 10 (in this example, it is rotated by one slot). This rotation is caused by an indexing device 8 driven by a shaft coupling 11 connected to the press crankshaft, which rotates an operating gear 9 by a predetermined amount, and a gear 7 connected to this operating gear 9 rotates the die 5. is rotated. Then, first roll 5 dice.
By means of the iron core veneer 10 supported by the core veneer 10 and the recesses 10a to 10e for fitting and positioning, the thin plate material is punched and caulked. In this way, each sheet is laminated by rotating one slot or several slots at a time.
The hole diameter of the rotor's shaft hole is equalized, and when the shaft is press-fitted into the shaft hole in the subsequent process, it can be installed reliably with uniform fixing strength without eccentricity or bending the shaft, improving yield. In addition, it is possible to improve the rotational balance of the rotor as a whole.

In the method of the present invention, one iron core veneer 1 is
0, and before supporting the next iron core veneer 10, the die 5 is rotated by an angle corresponding to one slot or several slots about the point symmetry axis of the iron core veneer 10, and a plurality of veneers are stacked one by one. iron core veneer 10
As a matter of course, in the method of the present invention, the die 5 is rotated in accordance with the number of laminated cores 12 to be manufactured.

In the above embodiment, a method was described in which the iron core veneers are stacked by turning one slot at a time, but in the case of iron core veneers having a large number of slots, they may be stacked by turning two or more slots.

[Effects of the Invention] As described above, according to the method of the present invention, since the outer diameter of the core veneer is used as a reference and the core veneers are rotated and laminated one by one, it goes without saying that the lamination deviation can be eliminated.
Variations in position due to punching of the iron core veneer are absorbed by the hole diameter of the shaft hole of the rotor without exposing it to the outer diameter side, and when press-fitting the rotating shaft into the shaft hole in the later process, the hole diameter of the shaft hole is By uniformly absorbing the positional deviation, it is possible to prevent the occurrence of eccentricity of the rotating shaft, distortion of the rotating shaft, etc., and it is possible to improve the yield without bending the rotating shaft. In addition, since the above-mentioned unevenness is absorbed on the shaft hole side without being biased to one side, press-fitting of the rotating shaft can be performed reliably with uniform fixation strength.
Good rotational balance can be achieved. As a result, it is possible to significantly reduce the unbalance correction work that is a problem unique to rotors, and it is possible to improve the rotational balance of the rotor as a whole.

[Brief explanation of drawings]

1 and 2 are perspective views of a laminated core of an armature manufactured by a conventional method, FIG. 3 is a longitudinal cross-sectional view of the main part of an apparatus for carrying out the manufacturing method of the present invention, and FIG. 4 is a view of the manufacturing apparatus. A partial plan view, FIG. 5, is an explanatory diagram of the lamination of iron core veneers showing the lamination method of the present invention. 1... Core shaft hole, 2... Slot, 3, 10...
... Iron core single plate, 4 ... Machine base, 5 ... Dice (cylindrical die), 6 ... Dice holder, 7 ... Gear,
8... Indexing device, 8a... Output shaft, 9... Operating gear, 10'... Bottom single iron core plate in Figure 3,
10a to 10e... Alignment portion (fitting alignment recess), 11... Shaft coupling, 12... Laminated core,
12a... core teeth part, 13... through hole, S
...Laminated core manufacturing equipment.

Claims (1)

[Claims] 1. Manufacture of a rotor for an inner rotor type motor having a laminated core made by laminating a plurality of core single plates, each having a shaft hole into which a rotating shaft is press-fitted and a plurality of core teeth portions, and alignment portions formed in the core teeth portions. In the method, the step of punching out the outer shape of the core veneer one by one from a thin plate material, and the step of punching out the outer shape of the core veneer one by one from the thin plate material, and punching out the core veneer one by one with the punching angle unchanged, one sheet based on the outer diameter of the core veneer. The rotating shaft is press-fitted into the shaft hole, and the rotating shaft is press-fitted into the shaft hole. 1 with the above dice
After supporting one iron core veneer, and before supporting the next iron core veneer, the die is rotated by an angle corresponding to one slot or several slots about the point symmetry axis of the iron core veneer, and the one iron core veneer is A method for manufacturing a rotor for an inner rotor type motor with a laminated core, characterized in that the rotor is laminated one by one to form a laminated core based on the outer diameter, and then the rotating shaft is press-fitted into the shaft hole. .