JP6580844B2 - Laminated rotor manufacturing method and laminated rotor manufacturing jig - Google Patents

Description

  The present invention relates to a technique for manufacturing a laminated rotor in which a motor shaft is press-fitted into a laminated iron core, and then a bar magnet is inserted.

  Laminated rotors (laminated rotors) in which a laminated iron core is attached to the motor shaft and a rod-shaped permanent magnet is attached to the laminated iron core are in practical use, and various methods for producing such rotors have been proposed. (For example, refer to Patent Document 1 (FIG. 4).)

  As shown in Patent Literature 1, a rotor core (1) formed by laminating electromagnetic steel plates punched and formed by pressing (numbers in parentheses indicate the symbols described in Patent Literature 1. The same applies hereinafter) It is sandwiched between the lower mold shrink-fitting jig (5) and the upper mold shrink-fitting jig (4). In this state, it is heated to 200 to 250 ° C. in an oven or the like. The shaft (10) is inserted into the through hole (9) after expansion. Next, the rotor core (1) is cooled to room temperature (25 ° C.). Then, the diameter of the through hole (9) is reduced, and the rotor core (1) is attached to the shaft (10).

Due to shrink fitting, the rotor core (1) can be firmly coupled to the shaft (10).
On the other hand, the rotor core (1) after heating must be quickly pressed into the shaft (10) before cooling. However, since the steel plates are laminated, a part of the steel plate protrudes from the through hole (9) of the rotor core (1), and the inner surface of the through hole (6) is uneven. The shaft (10) may hit the unevenness, and it may take time to press fit. If time is taken, the rotor core (1) will be cooled, and the press-fit will be insufficient (incomplete).

  As described above, the shrink fitting method has a time restriction, and a problem is likely to occur when the shaft (10) is press-fitted into the through hole (9) having an uneven surface. As a countermeasure, a press-in method at room temperature without time constraints is required.

  Moreover, in the technique of patent document 1, heating apparatuses, such as a lower mold | die shrink fitting jig | tool (5), an upper mold shrink fitting jig | tool (4), and oven, are essential, and the manufacturing cost of a jig | tool and an apparatus increases. Simplification of jigs and devices is required.

JP2013-153559A

  An object of the present invention is to provide a manufacturing technique of a laminated rotor in which a motor shaft can be press-fitted into a laminated iron core at room temperature and a jig is simple.

The invention according to claim 1 is provided separately from a punched steel plate or shaft fitting hole having a shaft fitting hole and a magnet insertion hole having a square cross section, a magnet insertion hole having a square cross section, and the shaft fitting hole or the magnet insertion hole. A punched steel plate having a through hole is laminated, and a stepped shaft-shaped motor shaft having a small diameter portion at least at one end is press-fitted into the shaft fitting hole of the obtained laminated iron core and the magnet insertion hole has an angular cross section. A method of manufacturing a laminated rotor that obtains a laminated rotor by inserting a bar magnet,
A guide rod insertion into the through hole provided in the guide rod or the laminated core of the corner section to be inserted into the magnet insertion holes of the laminated core, one end of the rod insertion hole and said motor shaft to insert one end of the guide rod Preparing a base having a shaft end insertion hole on the upper surface for inserting
The step of standing the guide rod on the base by inserting one end of the guide rod into the rod insertion hole without inserting the motor shaft into the shaft end insertion hole ;
Placing the laminated core on the base while passing the guide rod through the magnet insertion hole or the through hole;
For the laminated iron core positioned with the guide rod, press-fitting the motor shaft into the shaft fitting hole from above, and inserting one end of the motor shaft into the shaft end insertion hole ;
Removing the obtained iron core with motor shaft from the base and the guide rod;
Inserting a bar magnet into the magnet insertion hole of the iron core with the motor shaft and fixing with a resin;
It is characterized by comprising.

The invention according to claim 2 is provided separately from a punched steel plate or shaft fitting hole having a shaft fitting hole and a magnet insertion hole having a square cross section, a magnet insertion hole having a square cross section, the shaft fitting hole, and the magnet insertion hole. Laminated rotor for use in a series of operations in which a punched steel plate having a through-hole is laminated and a stepped shaft-shaped motor shaft having a small diameter portion at least one end is press-fitted into the shaft fitting hole of the obtained laminated core A manufacturing jig,
A guide rod insertion into the through hole provided in the guide rod or the laminated core of the corner section to be inserted into the magnet insertion holes of the laminated core, rod insertion hole and the motor inserted to be pull the one end of the guide rod And a base having a shaft end insertion hole on the upper surface for removably inserting one end of the shaft.

In the invention which concerns on Claim 1, the magnet insertion hole or through-hole of a square cross section is utilized skillfully. That is, the center of the punched steel sheet is substantially aligned by setting up a guide rod on the base and guiding the magnet insertion hole or the through hole with this guide rod. If they are almost matched, the motor shaft can be press-fitted into the shaft fitting hole of the laminated core with the small diameter portion of the motor shaft first. Since this press-fitting is performed at room temperature, no time restriction is imposed.
Therefore, according to this invention, the manufacturing technique of the lamination | stacking rotor which can press-fit a motor shaft to a lamination | stacking iron core at normal temperature is provided.

  In the invention according to claim 2, the jig required for manufacturing includes a base and a guide rod that is detachably attached to the base, and the jig configuration is extremely simple, reducing the cost of jig procurement. be able to.

It is sectional drawing of the motor which incorporates the lamination | stacking rotor based on this invention. It is sectional drawing of the lamination | stacking rotor based on this invention. It is a front view of a punched steel plate. It is a disassembled perspective view of a jig | tool. It is a figure explaining the process of putting up a guide rod, and the process of mounting a laminated iron core on a base. It is a figure explaining the process of press-fitting a motor shaft. It is a figure explaining the process of removing a laminated iron core from a guide rod. It is another figure explaining the insertion procedure of a bar magnet, and injection | pouring of resin. It is another figure explaining the insertion procedure of a bar magnet, and the injection | pouring of resin. It is a figure explaining the insertion procedure of a bar magnet, and injection | pouring of resin. It is the 11 part enlarged view of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the motor 10, also called a rotating machine, is a rotating machine having a laminated rotor 20 and a laminated stator 12 as main elements.
The laminated rotor 20 is rotatably supported by the housing 14 and the lid 15 via bearings 13 and 13.
The laminated stator 12 is attached to the housing 14 so as to surround the laminated rotor 20.

As shown in FIG. 2, the laminated rotor 20 includes a motor shaft 21, a laminated iron core 22 attached to the motor shaft 21, and bar magnets 23 and 23 attached to the laminated iron core 22.
The motor shaft 21 is a stepped shaft including a large diameter portion 25 and small diameter portions 26 and 27 formed at both ends of the large diameter portion 25.
The laminated iron core 22 is an iron core formed by laminating several hundred punched steel plates 28.

As shown in FIG. 3, the punched steel sheet 28 is a perforated disk formed by punching from a strip of electromagnetic steel sheet with a press, and coated with a thermosetting resin as an adhesive and insulating material on one side or both sides. Has been.
A shaft fitting hole 31 is punched and formed in the center, and a plurality (16 in this example) of magnet insertion holes 32 and through holes (not shown) are punched and formed in the periphery so as to surround the shaft fitting hole 31. Has been.

  The through hole refers to a through hole other than the magnet insertion hole 32, such as a stress relaxation hole for relaxing stress, a lightening hole for reducing weight, and a refrigerant passage hole for circulating refrigerant.

The shaft fitting hole 31 has a hole diameter that allows a press-fitting allowance of 0.015 mm to 0.05 mm on one side. That is, the hole diameter is obtained by subtracting 0.03 mm to 0.10 mm from the outer diameter (drawing dimension) of the large diameter portion 25 of the motor shaft 21.
The magnet insertion hole 32 is a square hole having a size (A × B) into which the bar magnet 23 can be easily inserted.

As shown in FIG. 4, the jig 34 includes a base 35 and a plurality (eight in this example) of guide bars 36.
In this example, it is inserted into half of the 16 magnet insertion holes 32 shown in FIG. By making the number half, an appropriate gap 37 is left between the adjacent guide rods 36, 36, and the fingers of the robot and the operator can easily enter the gap 37.

The base 35 includes, on the upper surface, a rod insertion hole 38 into which one end (lower end) of the guide rod 36 is fitted and a shaft end insertion hole 39 into which one end (lower end) of the motor shaft 21 is fitted.
The guide rod 36 is a column having a rectangular cross section corresponding to the magnet insertion hole 32 shown in FIG. 3 or a column corresponding to the through hole.
When the cross-sectional dimension of the magnet insertion hole 32 is A × B and the cross-sectional dimension of the guide rod 36 is a × b, for example, a = A− (0.01 to 0.03 mm), b = B− (0. It is desirable to set the cross-sectional dimension of the guide rod 36 to be smaller than the cross-sectional dimension of the magnet insertion hole 32 so as to be 01 to 0.03 mm. The guide rod 36 can be easily inserted into the magnet insertion hole 32, or the magnet insertion hole 32 or the through hole can be easily fitted into the guide rod 36.

In addition, it is not limited to the tolerance mentioned above, The tolerance (dimension difference) of the magnet insertion hole 32 and the guide rod 36 can be selected from the range of (-0.02 mm-+0.03 mm).
When the tolerance is 0 to minus, it is difficult to fit the magnet insertion hole 32 into the guide rod 36. In this case, the guide rod 36 may be provided with a structure for expanding and contracting the dimensions a and b.

As the structure for expanding and contracting, a structure in which the a and b dimensions are enlarged by dividing the guide bar 36 in the cross-sectional direction and providing a mechanism for moving or opening and closing the divided guide bar in the cross-sectional direction is recommended.
Further, the guide rod 36 is a hollow body divided in cross section, and a tapered core rod (the inner surface of the hollow body is also tapered) is taken in or out, or a high pressure medium is injected to expand the dimensions a and b. Depending on the structure to be used, the dimensions a and b may be variable. If it is this structure, it is easy and there is no worry that jig cost increases.

  As shown in FIG. 5A, the guide rod 36 is erected on the base 35. Then, the punched steel plate 28 is placed on the base 35 while the guide rod 36 is passed through the magnet insertion hole 32 by the robot hand 41, suction means, mechanical device, or manual operation. By repeating this, the laminated core 22 is placed on the base 35 as shown in FIG.

The suction means may be one that vacuum-sucks the punched steel plate 28 with a vacuum pad or one that magnetically suctions the punched steel plate 28 with an electromagnet, and the suction principle is arbitrary.
Any mechanical device may be used as long as the punched steel sheet 28 is dropped by its own weight by a mold device or a transport device, and the structure is arbitrary.

In FIG. 5 (b), the horizontal positions of the adjacent upper and lower punched steel plates 28, 28 are substantially aligned by the guide action of the guide rods 36, 36. As a result, the central shaft fitting hole 31 is a substantially straight cylinder. It becomes space. Next, the motor shaft 21 is transported by the robot hand 41 or manually, and is inserted into the upper portion of the shaft fitting hole 31 with one small diameter portion 26 facing down.
At this time, since the large-diameter portion 25 has a larger diameter than the shaft fitting hole 31 by a press-fitting allowance, only a portion of the length L0 in the drawing enters the shaft fitting hole 31 in a state where no axial force is applied.

  As shown in FIG. 6A, which is an enlarged view of the portion 6a in FIG. 5B, an axis orthogonal surface 42 exists between the small diameter portion 26 and the large diameter portion 25, and this axis orthogonal surface 42 and the large diameter A chamfer 43 having a radius R is applied to a portion where the portion 25 intersects. That is, a chamfer 43 is always provided at a sudden change portion of the cross section in order to avoid stress concentration. The chamfer 43 may be a so-called C chamfer (a chamfer with a 45 ° slope) in addition to the round chamfer.

Although the punched steel sheet 28 is aligned with the guide rod 36, when the shaft fitting hole 31 is enlarged as shown in FIG. Are mixed.
However, the laminated punched steel plates 28 are not in a fixed state, but have a chamfer 43, so that the large diameter portion 25 is inserted into the shaft fitting hole 31 (press-fit) even if the projections 44, 45 and the recess 46 exist. The unevenness 44 to 46 can be leveled by this insertion (press-fitting). That is, centering of a number of punched steel sheets 28 can be performed at the large diameter portion 25.

  As shown in FIG. 6B, the motor shaft 21 is press-fitted into the shaft fitting hole 31 of the laminated core 22 by pushing down the motor shaft 21 with the punch 47.

  As shown in FIG. 7, the obtained iron core 49 with a motor shaft is pulled up by the robot hand 41 or manually and removed from the jig 34.

  At this time, as shown in FIG. 8, a part of the guide rods 36 or all of the guide rods 36 may come off the base 35 in a state where the guide rods 36 are attached to the iron shaft 49 with a motor shaft. In this case, the motor shaft-equipped iron core 49 is moved to a place where the work is easy, and the work of removing the guide rod 36 from the motor shaft-equipped iron core 49 is performed.

Consider further with respect to FIGS.
6 (a) and 6 (b), when the motor shaft 21 is press-fitted, the punched steel sheet 28 slightly moves left and right. It is assumed that the punched steel plate 28 comes into contact with the guide rod 36 by this movement.
Then, in the initial stage of FIG. 7, the frictional resistance between the motor shaft-equipped iron core 49 and the guide rod 36 increases, and as a result, it becomes difficult to smoothly pull the motor shaft-equipped iron core 49 upward from the guide rod 36. is assumed.
As a countermeasure, the guide rod 36 is pulled out from the base 35. Thus, it is possible to cope with any form of FIG. 7 and FIG. 8 and to keep the work smooth.

  Alternatively, as shown in FIG. 9A, the guide rod 36 is pulled out from the iron shaft 49 with a motor shaft on the base 35 and removed in advance. Next, as shown in FIG. 9B, the iron core 49 with the motor shaft may be pulled up by the robot hand 41 or manually and removed from the base 35.

  Next, as shown in FIG. 10A, the motor shaft-equipped iron core 49 is placed on the work table 51, and the bar magnets 23 and 23 are inserted into the magnet insertion holes 32. Since the magnet insertion hole 32 is slightly larger in diameter than the bar magnet 23, the insertion work of the bar magnet 23 is relatively easy. It is possible to divert the base (FIG. 4, reference numeral 35) to the work table 51.

  Next, as shown in FIG. 10 (b), resin is injected around the inserted bar magnet 23 by the resin gun 52. As shown in FIG. 11, which is an enlarged view of 11 part of FIG. 10B, there are gaps 53, 53 between the bar magnet 23 and the magnet insertion hole 32. These gaps 53, 53 are made of resin 54. Filled.

  In the state of FIG. 11, the resin 54 is charged into the heating furnace, and the filled resin 54 and the thermosetting resin 55 serving as an adhesive and an insulating material are cured. As a result, the laminated rotor 20 shown in FIG. 2 is completed.

The manufacturing method of the laminated rotor 20 described in detail above can be summarized as follows.
That is, as shown in FIG. 4, a guide rod 36 inserted into a through hole having a square cross section to be inserted into the magnet insertion hole 32 of the laminated core 22, a rod insertion hole 38 into which one end of the guide rod 36 is inserted, and A base 35 having a shaft end insertion hole 39 into which one end of the motor shaft 21 is inserted is prepared (preparation step).

Next, as shown in FIGS. 4 and 5, the guide rod 36 is raised on the base 35 by inserting one end of the guide rod 36 into the rod insertion hole 38 (step of raising the guide rod).
Then, as shown in FIGS. 5A and 5B, the laminated core 22 is placed on the base 35 while the magnet insertion hole 32 or the through hole is fitted to the guide rod 36 (step of placing the laminated core).

Next, as shown in FIGS. 6A and 6B, the motor shaft 21 is press-fitted from above into the shaft fitting hole 31 of the laminated core 22 positioned by the guide rod 36 (press-fit). Process).
The obtained motor shaft-equipped iron core 49 is removed from the base 35 and the guide rod 36 in the manner shown in FIGS.
Next, as shown in FIGS. 10 and 11, the bar magnet 23 is inserted into the magnet insertion hole 32 of the iron shaft 49 with a motor shaft, and is fixed with a resin 54 (insertion fixing step).

  The jig 34 used in the above manufacturing method includes a base 35 and a guide rod 36, is extremely simple, is inexpensive, and is suitable for small-scale production.

  The present invention is suitable for manufacturing a small-sized laminated rotor for a small motor, but may be applied to mass production or a medium-large motor laminated rotor.

  The present invention is suitable for manufacturing a small-scale production laminated rotor.

  DESCRIPTION OF SYMBOLS 20 ... Laminated rotor, 21 ... Motor shaft, 22 ... Laminated iron core, 23 ... Bar magnet, 25 ... Large diameter part of motor shaft, 26 ... Small diameter part of motor shaft, 28 ... Punched steel plate, 31 ... Shaft fitting hole, 32 ... Magnet insertion hole, 34 ... Jig, 35 ... Base, 36 ... Guide rod, 38 ... Bar insertion hole, 39 ... Shaft end insertion hole, 49 ... Iron core with motor shaft.

Claims (2)

Punched steel sheet having a shaft fitting hole and a magnet insertion hole having a square cross section or a punched steel sheet having a shaft fitting hole, a magnet insertion hole having a square cross section, and a through hole provided separately from the shaft fitting hole and the magnet insertion hole Lamination is performed by press-fitting a stepped shaft-shaped motor shaft having a small diameter portion at least at one end into the shaft fitting hole of the obtained laminated iron core and inserting a bar magnet having a square section into the magnet insertion hole. A method of manufacturing a laminated rotor for obtaining a rotor,
A guide rod insertion into the through hole provided in the guide rod or the laminated core of the corner section to be inserted into the magnet insertion holes of the laminated core, one end of the rod insertion hole and said motor shaft to insert one end of the guide rod Preparing a base having a shaft end insertion hole on the upper surface for inserting
The step of standing the guide rod on the base by inserting one end of the guide rod into the rod insertion hole without inserting the motor shaft into the shaft end insertion hole ;
Placing the laminated core on the base while passing the guide rod through the magnet insertion hole or the through hole;
For the laminated iron core positioned with the guide rod, press-fitting the motor shaft into the shaft fitting hole from above, and inserting one end of the motor shaft into the shaft end insertion hole ;
Removing the obtained iron core with motor shaft from the base and the guide rod;
Inserting a bar magnet into the magnet insertion hole of the iron core with the motor shaft and fixing with a resin;
A method for manufacturing a laminated rotor, comprising: Punched steel sheet having a shaft fitting hole and a magnet insertion hole having a square cross section or a punched steel sheet having a shaft fitting hole, a magnet insertion hole having a square cross section, and a through hole provided separately from the shaft fitting hole and the magnet insertion hole A laminated rotor manufacturing jig used for a series of operations in which a stepped shaft-shaped motor shaft having a small diameter portion at least at one end is press-fitted into the shaft fitting hole of the laminated core obtained by stacking,
A guide rod insertion into the through hole provided in the guide rod or the laminated core of the corner section to be inserted into the magnet insertion holes of the laminated core, rod insertion hole and the motor inserted to be pull the one end of the guide rod A jig for manufacturing a laminated rotor, comprising: a base having a shaft end insertion hole on an upper surface into which one end of a shaft is removably inserted.

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