JP2738400B2 - Motor stator core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core for an electric motor, and more particularly, to a stator core and a yoke core which are formed separately from each other. The present invention relates to a stator core of an electric motor to be joined to a motor.

[0002]

2. Description of the Related Art Conventionally, a stator core of an electric motor is formed by separately forming a tooth core and a yoke core, winding a stator winding around the tooth core, and engaging with the yoke core. In
As shown in FIG. 4, in order to avoid the deterioration of the magnetic characteristics due to the connection of the inner peripheral edge of the tooth portion, as shown in FIG. A method is adopted in which a plurality of layers are alternately combined and laminated, and in that state, a stator winding is wound from the outside and engaged with a yoke core. However, the toothed core having no bridging portion has a weak fixing strength, and the toothed portion is likely to be deformed or displaced during the motor manufacturing process. There is a danger that the gap may cause an increase in current or cause serious troubles such as contact with the rotor when incorporated in the motor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a stator core structure of an electric motor for increasing the fixing strength of a tooth core without greatly deteriorating magnetic characteristics. It is intended to be offered.

[0004]

In order to achieve the above-mentioned object, the width of a bridge portion of a core sheet constituting a tooth core is defined by:
It was composed of two types, one having a thickness of 0.1 or more and 0.5 mm or less, and one having a size of 0.5 mm or more.

[0005]

According to the above arrangement, the inner peripheral edge of the tooth core is
Core sheet A connected by a bridging part having a minimum width of 0.1 to 0.5 mm that can be punched, and a width of 0.5 mm for the bridging part
By laminating and laminating the core sheet B having the above-mentioned margin alternately in one or more layers, the fixing strength of the tooth core is reinforced by the core sheet B, and the stator withstands handling in the motor manufacturing process. An iron core can be formed. In addition, by making the width of the bridge as narrow as possible and reducing the cross-sectional area of the bridge, the leakage magnetic flux leaking through the bridge is immediately magnetically saturated, causing the deterioration of magnetic properties that is particularly problematic. Absent.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a core sheet A of a tooth core 2 of the present invention placed in a state of being joined to a yoke core 1, and FIG. 2 is a plan view of a core sheet B. Are integrally connected by a bridging portion 3 having a predetermined width, radially projecting teeth 4 outward, and having a joining groove 5 of the yoke core 1 at the tip.
And a joining claw 6 that engages with the boss. In the present embodiment, the width of the bridging part 3 is set to the value of the core sheet A within a range in which press punching is possible.
Is 0.7 mm and that of the core sheet B is 0.2 mm. One or a plurality of core sheets A and B are alternately stacked and laminated, and the other portions except for the engaging claws 6 are insulated and passed through the engaging claws 6 of the tooth portions 4 from the outside. And the engaging claw 6 is engaged with the engaging groove 5 of the yoke core 1 to form a stator.

FIG. 3 is a plan view and an enlarged cross-sectional side view showing an engaged state between the core sheets A and B and the yoke core 1. As shown in FIG. The combination of the core sheets A and B is adjusted so as to make the cross section as small as possible, and the core sheet A maintains the fixing strength of the tooth core high.

[0008]

As described above, in the present invention, the inner peripheral edges of a plurality of tooth cores are integrally connected by a bridging portion, and the cross-sectional area of the bridging portion is reduced as much as possible, thereby improving the magnetic characteristics. It is possible to provide a stator core that does not significantly decrease and can sufficiently withstand handling in the motor manufacturing process.
In addition, since the tooth cores are connected at the inner peripheral edge, it is possible to simplify the manufacturing equipment and save labor for winding the stator windings. Resin inflow is prevented, and labor saving in resin molding work can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view and a main part enlarged view of a core sheet A of a tooth core according to the present invention.

FIG. 2 is a plan view and an enlarged view of a main part of a core sheet B of a tooth core according to the present invention.

FIG. 3 is a plan view and a main part enlarged cross-sectional side view of a state where core sheets A and B of the present invention are stacked.

FIG. 4 is a plan view of a conventional core sheet of a tooth core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke core 2 Teeth core 3 Bridge 4 Teeth 5 Engagement groove 6 Engagement claw

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yuji Kawai 1116 Suenaga, Takatsu-ku, Kawasaki City Inside Fujitsu General Co., Ltd. Nobukatsu Hirata (56) References JP-A-2-307339 (JP, A) JP-A-2-26125 (JP, A) JP-A-63-174531 (JP, A)

Claims (1)

(57) [Claims] 1. A tooth core having a plurality of teeth radially projecting outwardly by connecting inner peripheral edges thereof with a bridging portion having a predetermined width, and a yoke core which is fitted on the outer periphery and forms a magnetic circuit. In the stator core of the electric motor, the width of the bridging portion of the core sheet constituting the tooth core is 0.1 to 0.5 mm and 0.5 mm or more.
What is claimed is: 1. A stator core for an electric motor, wherein a plurality of types of core sheets are alternately combined and laminated.