TWI465005B - Laminated core of motor - Google Patents

Description

Multilayer core of motor

The present invention relates to a laminated core formed by laminating a steel sheet for use as a rotor core or a stator core of an electric motor.

Conventionally, there has been disclosed a stator core comprising a laminated body in which a plurality of through-holes and a core material having bolt holes on both sides of the through-hole are laminated; and a through-hole which is formed by tightening the iron core material by being expanded; and a part or all of the two ends of the laminated body protruding from the laminated body are formed a detachment preventing portion that is opened in the radial direction, and a squashed portion that is flattened by a plate punch is formed in the detachment preventing portion, and the plurality of core materials are bundled and temporarily fixed. The laminated system is housed in a case in a temporarily fixed state, and is fixed to the case by inserting a bolt into the bolt hole (see, for example, Patent Document 1).

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2011-19400

However, according to the above-mentioned prior art, a plurality of through holes are provided in the laminated body, and bolt holes are provided on both sides of the through holes, and the tightening cylinder and the bolt are inserted into the individual holes to tighten the laminated body. . Therefore, there will be The number of pores in the laminate is increased, and the magnetic permeability of the laminate is adversely affected. Further, since the above-described conventional technique fixes the laminated body to the casing by bolts, there is a problem that it cannot be applied to a rotor of an electric motor, and can be applied only to a stator.

The present invention has been made in view of the above problems, and an object thereof is to provide a laminated iron core for an electric motor, which can reduce the number of holes for members for tightening a steel sheet laminate and reduce adverse effects on magnetic permeability, and laminate steel sheets. The stack offset is modified to improve the stacking accuracy and can be used for the rotor and stator.

In order to achieve the object, the laminated core of the motor of the present invention includes a steel sheet laminate, and a plurality of annular steel sheets provided with a plurality of through holes are laminated to form a plurality of sheets; the tubular member is inserted into the through hole; And a rivet pin inserted into the tubular member, and the tubular member is expanded in diameter to be pressed against the through hole, and the caulking portion at the tip end is swaged to tighten the steel sheet laminate. .

The laminated iron core of the motor of the present invention can achieve the effects of high magnetic permeability and high stacking accuracy. As a result, if it is used in the stator, the contact area with the casing can be increased, and the cooling performance can be improved. If it is used in the rotor, the initial unbalance amount can be reduced, and it is advantageous in high-speed rotation.

Hereinafter, embodiments of the laminated core of the motor of the present invention will be described in detail based on the drawings. Further, the present invention is not limited to the embodiment.

(Embodiment 1)

Fig. 1 is a cross-sectional view showing a rotor core according to a first embodiment of the laminated core of the motor of the present invention, wherein Fig. 2 is an enlarged view of the caulking portion of Fig. 1, and Fig. 3 is a view showing the first embodiment. Fig. 4 is a cross-sectional view showing the balance ring, and Fig. 5 is a perspective view showing the cylindrical member of the first embodiment.

As shown in FIG. 1 to FIG. 5, the rotor core 91 of the laminated core of the motor of the first embodiment includes a steel sheet laminate 1 in which a plurality of (8) through holes 1a are formed at equal intervals. a plurality of sheets of the same circumferential shape as the annular steel plate are laminated; the cylindrical member 2 is inserted into the through hole 1a; and the rivet pin 3 is inserted into the tubular member 2, and the cylindrical member 2 is expanded The steel plate laminated body 1 is tightened by pressing the through hole 1a and caulking the front end caulking portion 3b.

In the first embodiment, the diameter of the rivet pin 3 is 8 ψ. In the case where the series of the motor has a small capacity to a large capacity, the diameter of the rivet pin 3 is fixed by 8 ψ, and is changed in accordance with the inner diameter of the through hole 1a of the steel sheet laminate 1 in which the capacity of the motor is increased. The outer diameter of the tubular member 2 is sufficient.

In the center of the steel sheet laminate 1, a shaft hole 1b to which a rotating shaft (not shown) is fitted is provided. Further, on the outer peripheral side of the through hole 1a, eight slit-shaped permanent magnet embedding holes 1e are formed in a ring shape. The tubular member 2 and the rivet pin 3 are made of iron-based metal. In the tubular member 2, a plurality of slits 2a are provided in the axial direction for adjusting the compressive elastic modulus in the thickness direction (see Fig. 5).

A balance ring 4 as a ring-shaped end plate is disposed at both end portions of the steel sheet laminate 1, and the balance ring 4 has the large diameter portion 4b and the through hole at the same position as the plurality of through holes 1a of the steel sheet laminate 1 1a is a through hole 4a having the same diameter and the small diameter portion 4c and the outer diameter of the rivet pin 3 having the same diameter as the stepped portion. In the center of the balance ring 4, a hole 4g having an inner diameter larger than that of the shaft hole 1b of the steel sheet laminate 1 is provided.

Both end portions of the tubular member 2 are locked to the segment portion 4d of the through hole 4a with the stepped portion, and the rivet pin 3 is formed by the head portion 3a and the caulking portion 3b, and the steel plate laminated body 1 and the balance ring (end plate) 4 Tightening.

Next, a method of manufacturing the rotor core of the motor of the first embodiment will be described. 6 is a partial cross-sectional view showing a first step of manufacturing a rotor core according to the first embodiment, and FIG. 7 is a partial cross-sectional view showing a second step of manufacturing a rotor core according to the first embodiment, and FIG. A partial cross-sectional view showing a third step of manufacturing a rotor core according to the first embodiment.

As shown in Fig. 6, in the first step, the balance ring 4 is disposed at one end of the steel sheet laminate 1. At this time, the large-diameter portion 4b side of the through-hole 4a with the step is in contact with one end of the steel sheet laminate 1, and the through-hole 1a is communicated with the through-hole 4a having the step. Next, the tubular member 2 is inserted into the through hole 1a from the other end side of the steel sheet laminate 1, and the front end of the tubular member 2 is locked to the step portion 4d of the through hole 4a with the step of the balance ring 4.

The inner diameter of the large diameter portion 4b of the through hole 1a of the steel plate laminate 1 and the through hole 4a of the balance ring 4 and the outer diameter of the tubular member 2 are made with a tolerance of 0.2 to 0.3 mm. The tubular member 2 can be easily inserted into the through hole 1a.

Next, as shown in Fig. 7, in the second step, the other balance ring 4 is disposed facing the large-diameter portion 4b side of the through-hole 4a with the step, and the rivet is placed on the other end side of the steel sheet laminate 1 The pin 3 is inserted into the tubular member 2 through the through hole 4a of the balance ring 4 with the step.

The outer diameter of the rivet pin 3 and the inner diameter of the cylindrical member 2 are made with a tight tolerance of 0.3 to 0.4 mm, and in the second step, the rivet pin 3 expands the cylindrical member 2, Further, the outer peripheral portion of the tubular member 2 is pressed against the through hole 1a of the steel sheet laminate 1 and the large diameter portion 4b of the through hole 4a with the step of the balance ring 4. By this pressing action, the offset of the steel sheet of the steel sheet laminate 1 and the offset of the balance ring 4 with respect to the steel sheet laminate 1 can be corrected, and the accuracy of the laminate can be improved.

Next, as shown in Fig. 8, in the third step, the balance ring 4 of the through hole 4a with the step of the balance ring 4 is fitted to the other of the cylindrical member 2 which protrudes on the other end side of the steel sheet laminate 1. One end portion, and the rivet pin 3 is pushed into the head portion 3a until it reaches the balance ring 4, and the steel plate laminated body 1 and the balance ring 4 are tightened by riveting the front end caulking portion 3b, that is, the first embodiment is completed. The rotor core 91 of the motor. The adjustment of the rotational balance of the rotor core 91 can be performed by cutting the portion of the balance ring 4 in the direction in which the center of gravity is biased by a drill, or by adjusting the screw hole at an equal pitch. The balance ring 4 is attached, and the screw is mounted on one of the lighter ones.

(Embodiment 2)

Fig. 9 is a perspective view showing the tubular member of the second embodiment. As shown in Fig. 9, the tubular member 22 of the second embodiment is provided with 1 in the axial direction. The slits 2a are formed in a cross section and form a C-shape. The tubular member 22 of the second embodiment is easy to manufacture and can be produced at low cost.

(Embodiment 3)

Fig. 10 is a perspective view showing the tubular member of the third embodiment. As shown in Fig. 10, the tubular member 32 of the third embodiment is formed into a mesh structure. The tubular member 32 of the third embodiment can reduce the compressive elastic modulus in the thickness direction and can reduce the insertion resistance of the rivet pin 3.

(Embodiment 4)

Fig. 11 is a perspective view showing the tubular member of the fourth embodiment. As shown in Fig. 11, the tubular member 42 of the fourth embodiment is formed into a spiral wound structure of an elongated plate. In the tubular member 42 of the fourth embodiment, a tubular member having an arbitrary diameter can be produced without using a pipe material.

(Embodiment 5)

Fig. 12 is an exploded perspective view showing the stator core of the fifth embodiment of the laminated core of the motor of the present invention. As shown in Fig. 12, the stator core 95 which is a laminated core of the motor of the fifth embodiment includes a steel sheet laminated body 51, and a plurality of (four) through holes 51a are formed at equal intervals in the same circumferential shape. The steel plate as a ring-shaped steel plate is laminated with a plurality of sheets; the tubular member 2 is inserted into the through hole 51a; and the rivet pin 3 is inserted into the tubular member 2, and the tubular member 2 is expanded and pressed The steel plate laminated body 51 is tightened by the through hole 51a and the crimping part 3b of the front end is crimped.

In the center of the steel sheet laminate 51, a large diameter hole 51b in which a rotor core (not shown) is disposed is provided. A plurality of slits 51f for winding a coil (not shown) are provided along the large diameter hole 51b.

An annular end plate 4 is disposed at both end portions of the steel sheet laminate 51, and the annular end plate 4 is at the same position as the plurality of through holes 51a of the steel sheet laminated body 51, and has a large diameter portion as shown in Fig. 4 4b is a through hole 4a having the same diameter as the through hole 51a and having the same diameter as the outer diameter of the rivet pin 3 and the stepped hole 4a. In the center of the end plate 4, a hole 4g having a larger inner diameter than the large diameter hole 51b of the steel sheet laminate 51 is provided.

Both end portions of the tubular member 2 are locked to the segment portion 4d of the through hole 4a with the step (see Fig. 4), and the rivet pin 3 is formed by the head portion 3a and the caulking portion 3b. The plate 4 is tightened. The stator core 95 of the motor of the fifth embodiment can be manufactured by the same manufacturing method as the method of manufacturing the rotor core 91 of the motor shown in Figs. 6 to 8 . Further, instead of the tubular member 2, the tubular members 22, 32, and 42 shown in Figs. 9 to 11 may be used.

As described above, the rotor core 91 of the first embodiment and the stator core 95 of the fifth embodiment have a small magnetic permeability because the number of the through holes 1a and 51a provided in the steel sheet laminates 1 and 51 is small. Further, the rivet pin 3 is inserted into the tubular member 2 inserted through the through holes 1a and 51a, and the tubular member 2 is expanded in diameter to be pressed against the through holes 1a and 51a, thereby correcting the steel plate laminated body 1, 51. The laminated layer of the steel sheet and the offset of the balance ring 4 with respect to the steel sheet laminates 1 and 51 can exhibit an effect of high build-up accuracy. As a result, the stator core 95 increases the contact area with the casing, and the cooling performance is improved, and the rotor core 91 can reduce the initial unbalance amount and is extremely excellent at high-speed rotation.

1, 51‧‧‧ steel plate laminate

1a, 51a‧‧‧through holes

1b‧‧‧ shaft hole

1e‧‧‧ permanent magnet buried hole

2, 22, 32, 42‧‧‧ cylindrical members

2a, 51f‧‧‧ slit

3‧‧‧Rivet pin

3a‧‧‧ head

3b‧‧‧Riveting

4‧‧‧balance ring (end plate)

4a‧‧‧through hole with section difference

4b‧‧‧The Great Trails Department

4c‧‧‧Little Trails Department

4d‧‧‧ Section

4g‧‧‧ hole

51b‧‧‧ Large diameter hole

91‧‧‧Motor rotor core (the laminated core of the motor)

95‧‧‧The stator core of the motor (the laminated core of the motor)

Fig. 1 is a cross-sectional view showing a rotor core according to a first embodiment of the laminated core of the motor of the present invention.

Fig. 2 is an enlarged view of the caulking portion of Fig. 1.

Fig. 3 is an exploded perspective view showing the rotor core of the first embodiment.

Figure 4 is a cross-sectional view showing a balance ring.

Fig. 5 is a perspective view showing the tubular member of the first embodiment.

Fig. 6 is a partial cross-sectional view showing the first step of manufacturing the rotor core of the first embodiment.

Fig. 7 is a partial cross-sectional view showing a second step of manufacturing a rotor core according to the first embodiment.

Fig. 8 is a partial cross-sectional view showing a third step of manufacturing a rotor core according to the first embodiment.

Fig. 9 is a perspective view showing the tubular member of the second embodiment.

Fig. 10 is a perspective view showing the tubular member of the third embodiment.

Fig. 11 is a perspective view showing the tubular member of the fourth embodiment.

Fig. 12 is an exploded perspective view showing the stator core of the fifth embodiment of the laminated core of the motor of the present invention.

1‧‧‧Steel laminate

1a‧‧‧through hole

1b‧‧‧ shaft hole

2‧‧‧Cylinder members

3‧‧‧Rivet pin

3a‧‧‧ head

3b‧‧‧Riveting

4‧‧‧balance ring (end plate)

91‧‧‧Motor rotor core (the laminated core of the motor)

Claims (8)

A laminated iron core for an electric motor, comprising: a steel sheet laminated body, wherein a plurality of annular steel plates provided with a plurality of through holes are laminated; the cylindrical member is inserted through the through hole; and the rivet pin is inserted into the steel plate In the cylindrical member, the tubular member is expanded in diameter and pressed against the through hole, and the crimped portion at the tip end is swaged to tighten the steel sheet laminate. The laminated core of the electric motor according to claim 1, wherein an annular end plate is disposed at both end portions of the steel sheet laminate, and the annular end plate is connected to the plurality of laminated layers of the steel sheet. The same position of the hole has a through hole having a large diameter portion having the same diameter as the through hole and a small diameter portion having the same diameter as the outer diameter of the rivet pin, and both end portions of the cylindrical member are locked to the attached The stepped portion of the through hole is stepped, and the rivet pin is used to tighten the steel sheet laminate and the end plate. The laminated core of the electric motor according to the second aspect of the invention, wherein the laminated core of the electric motor is a rotor core of the electric motor. The laminated core of the electric motor according to claim 3, wherein the end plate is a balance ring. The laminated core of the electric motor according to the first or the second aspect of the invention, wherein the laminated core of the electric motor is a stator core of the electric motor. A laminated core of an electric motor according to claim 1 of the patent application, In the cylindrical member, one or a plurality of slits are provided in the axial direction. The laminated core of the electric motor according to the first aspect of the invention, wherein the tubular member is formed in a mesh structure. The laminated core of the electric motor according to the first aspect of the invention, wherein the tubular member is formed in a spiral wound structure of an elongated plate.