JPH02179247A - Manufacturing of motor core - Google Patents

Abstract

PURPOSE:To prevent the axial slippage of an electromagnetic steel plate without deforming a tip part of the ribbon-like electromagnetic steel plate by coating allover the peripheral of the electromagnetic steel plate with a ring shaped member. CONSTITUTION:A ring shaped internal member 11 provided with a cylinder section 11a having a flange 11b on the end thereof is formed of non-magnetic substance such as aluminum and the like, and a ribbon-like electromagnetic steel plate such as a silicon steel plate is wound about the cylinder 11a. After the completion of it, a ring shaped external member 13 with which the peripheral side of the electromagnetic steel plate 12 is coated all over is inserted. After the insertion, slits 14 are formed on the ring shaped internal and external members 11, 13 and the ribbon-like electromagnetic steel plate 12. A required number of the slits 14 are radiated in correspondence with the number of slots.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an iron core for an electric motor, particularly an iron core suitable for use in an AC motor having circumferential and axial magnetic circuits.

[Prior Art] Conventionally, as a method for manufacturing this type of iron core, there is a technique described in, for example, Japanese Patent Application Laid-open No. 152259/1983.

The manufacturing process will be explained based on FIGS. 4 and 5.

FIG. 4 is an explanatory diagram of the processing process of the ribbon-shaped material. A magnetic steel plate 1 cut into ribbons of predetermined dimensions as shown in FIG. 1(a) is processed by a notching machine into a ribbon-like material 3 having a large number of notches 2 as shown in FIG. 2(b). The pitch g is determined by the number of slots. Since the circumferential length of each layer of the wound core increases toward the outside, the pitch p of the notches 9 must also be increased accordingly. Next, as shown in FIG. 4C, an interlayer insulating material 4 such as an insulating face is applied to the ribbon-shaped material 8 and baked.

FIG. 5 is a diagram showing the process of winding the ribbon-like rope material 3, and FIG. 5(a) shows an example of the inner ring member 5 that becomes the core when the ribbon-like material 3 is wound. The inner ring member 5 is annular and has a keyway 5a for fixing to a winding shaft (not shown), and is provided with slits 5b at two locations for fixing the ribbon-like material 3. Using this slit 5b, the beginning of winding of the ribbon-like material 3 is fixed as shown in FIG. 5(b), and the ribbon-like material 3 is wound around the inner ring member 5 as shown in FIG. Wrap it in a spiral. Finally, as shown in FIG. 5(d), an annular outer ring member 7 is fitted to the outer periphery of the rolled up iron core 6 to fix the end of the ribbon-like material 3 so that the iron core 6 does not loosen.

FIG. 6 shows an example in which an iron core manufactured by a conventional method is applied to a squirrel-cage rotor of an induction motor. A radial slot 8 is formed in one end surface of the iron core 6 by the notch 2 of the ribbon-like material 3, and a squirrel cage conductor 9 is attached so as to surround the toothed portion between the slots. Ring member 5
is fixed to the rotor shaft 10 to constitute a flat squirrel cage rotor.

[Problems to be Solved by the Invention] In conventional manufacturing methods, when a ribbon-like material with a notch formed is wound around an inner ring member, the ribbon-like material is wound with a constant tension. Therefore, as shown in FIG. 3, the tip of the ribbon-like material is deformed, causing the problem that the magnetic pole surface becomes open.

In such a case, the rotor,
There was a problem in that the magnetic resistance between the stators increased and the performance of the motor deteriorated.

This tendency was particularly noticeable when the tooth portion was longer than the yoke portion.

Furthermore, since the ribbon-like material is simply wound around the inner ring as a core, there is a problem in that the ribbon-like material is displaced in the axial direction of the cylinder.

OBJECTS OF THE INVENTION The present invention has been made to solve the above problems, and provides a method for manufacturing an iron core for an electric motor that can prevent the axial shift of the electrical steel sheet without deforming the tip end of the ribbon-shaped electrical steel sheet. The purpose is to provide.

[Means and effects for solving the problem] - A step of fixing one end to a cylindrical portion of an inner ring-shaped member having a flange on one end face, and spirally winding a ribbon-shaped electromagnetic steel plate around the cylindrical portion as a core. , a step of fitting an outer ring-shaped member to cover the entire outer peripheral side surface of the wound electromagnetic steel sheet, and a step of forming predetermined slits radially in the inner ring-shaped member, the outer ring-shaped member, and the electromagnetic steel sheet. It is characterized by

Since the present invention is manufactured through the steps described above, the tip of the ribbon-shaped electromagnetic steel sheet is not deformed, and furthermore, the electromagnetic steel sheet is prevented from shifting in the axial direction.

[Example] Hereinafter, a preferred example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a diagram showing the manufacturing process of a stator-side iron core used in a permanent magnet rotation type synchronous motor.

As shown in FIG. 1(a), an inner ring-shaped member 11 having a cylindrical portion 11a and a flange portion 11b on one end surface is formed of a non-magnetic material such as aluminum, and a ribbon-shaped electromagnetic wire is attached to the cylindrical portion 11a. A steel plate, for example a silicon steel plate 12, is wound.

When winding, first the cylindrical portion 1 of the inner ring-shaped member 11 is
A ribbon-shaped electromagnetic steel plate 12 is inserted into the notch 11c formed in 1a.
The tip is bent and fixed by fitting, and then wound by a winding machine (not shown) a predetermined number of times while applying a constant tension.

Since the ribbon-shaped electromagnetic steel sheet 12 is wound while contacting the flange 11b of the inner ring member 11, it is wound without shifting in the cylindrical axial direction.

After the winding is completed, as shown in FIG. 1(b), the outer ring-shaped member 13 that covers the entire outer peripheral side surface of the electromagnetic steel sheet 12 is inserted in the direction of the arrow.

Since the diameter of the distal end surface (insertion side) of the outer ring-shaped member 13 is larger than the diameter of the rear end surface, the inner surface of the outer ring-shaped member 13 is a tapered surface that gradually narrows from the insertion side. It becomes.

Due to its tapered surface, the outer ring-shaped member 13 is easily fitted into the wound ribbon-shaped electromagnetic steel sheet 12.

After fitting the outer ring member 13, as shown in FIG. 1(c), the inner and outer ring members 11 are
．． 13 and a slit 14 is formed in the ribbon-shaped electromagnetic steel sheet 12. A desired number of slits 14 are formed radially corresponding to the number of slots.

FIG. 2 shows the case where the iron core manufactured by the above method is used in the stator of a permanent magnet rotary type synchronous motor.

In the figure, 15 is a rotating shaft, 16 is a permanent magnet fixed to the rotating shaft 15, 17 is a ball bearing that rotatably supports the rotating shaft 15, 18 is a casing of the motor, and 19 is a casing 18 of the motor. The stator is fixed by fixing means such as screws, and the stator 19 is fixed to the casing 18 using the flange portion 11b of the inner ring-shaped member 11. 20 is a coil wound around the stator.

Therefore, when current flows through the coil 20, the electromagnetic steel plate 12
Since it is S-poled or N-poled, a tensile force or a repulsive force is generated between the rotor and the permanent magnet 16, and this force causes the rotor (rotating shaft) to rotate.

In this way, when the iron core of the present invention is used as a stator, it can be easily attached to the casing using a flange and a fixing means such as a screw.

In addition, although the case where it applied to the stator of a permanent magnet rotation type synchronous motor was described above as a preferable example, it is not limited to this in particular, and can naturally be applied to a rotor.

[Effects of the Invention] As described above, according to the present invention, since the entire outer peripheral side surface of the electromagnetic steel sheet is covered with the ring-shaped member, the tip end (magnetic pole surface) of the electromagnetic steel sheet is prevented from deforming (opening). No rotor,
The magnetic resistance between the stators can be reduced, and the displacement of the magnetic steel plates in the cylindrical axis direction can also be prevented, allowing the expected original performance of the motor to be exhibited.

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing an embodiment of the present invention, Fig. 2 is a sectional view of a permanent magnet rotary synchronous motor in which the iron core manufactured by the present invention is applied to the stator, and Fig. 3 is a conventional ribbon-shaped synchronous motor. Figure 4 shows the manufacturing process of electrical steel sheets, Figure 4 shows the manufacturing process of conventional iron cores, and Figure 5 shows the manufacturing process of conventional iron cores.
FIG. 6 is a diagram showing the configuration of a conventional squirrel cage rotor. 11... Inner ring member 11b... Flange portion 11c... Cylindrical portion 12... Electromagnetic steel plate 13... Outer ring member 14... Slit

Claims (1)

[Claims] a step of fixing one end to a cylindrical portion of an inner ring-shaped member having a flange on one end surface, and spirally winding a ribbon-shaped electromagnetic steel sheet around the cylindrical portion; and an outer peripheral side surface of the wound electromagnetic steel sheet. A method of manufacturing an iron core for an electric motor, comprising the steps of: inserting an outer ring-shaped member that covers the entire body; and forming predetermined slits radially in the inner ring-shaped member, the outer ring-shaped member, and an electromagnetic steel sheet.