JP2940168B2 - Motor split 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 split stator core of an electric motor comprising a magnetic pole core and a yoke core used in a small motor.

[0002]

2. Description of the Related Art Conventionally, this kind of split stator core is shown in FIG.
As shown in the figure, a plurality of magnetic pole teeth 21
To form a star-shaped magnetic pole core 23, and a winding 25 is wound around the slot 24. Then, the outer diameter of the magnetic pole teeth 21 is press-fitted into the inner diameter of an annular yoke core 26. To obtain a small motor stator. The magnetic pole core 2
The ring 22 connecting the three magnetic pole teeth 21 has a width f that is sufficiently smaller than the width e of the magnetic pole teeth 21 so that the magnetic resistance is not increased and the characteristics of the motor are not deteriorated. On the other hand, the yoke core 26 has a width g that is sufficiently larger than the width e of the magnetic pole teeth 21 so that a sufficient magnetic flux density can be obtained. This type of split stator core composed of the magnetic pole core 23 and the yoke core 26 is suitable for winding the winding 25 because the outer diameter side of the magnetic pole teeth 21 is open. Many are used.

[0003]

However, in this type of conventional split stator core, the width of the ring, which is the connecting portion of the magnetic pole teeth, is extremely small as compared with the width of the yoke core, so that the mechanical stiffness is low. When the magnetic pole core is press-fitted into the yoke core, it is affected by dimensional errors in the press-fitting margin and processing burrs, causing dimensional changes in the magnetic pole core inner diameter and the rotor inserted into the magnetic pole core inner diameter. This causes a problem that the air gap changes, which increases vibration and noise and greatly impairs the characteristics of the electric motor.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a split stator core which does not cause a change in the inner diameter of the pole core when press-fitting the pole core and the yoke core. .

[0005]

In order to achieve this object, a split stator core of a motor according to the present invention has a tapered portion in which a magnetic pole tooth of a magnetic pole portion is fitted to a yoke core. And the radial dimension of the mating groove of the yoke core is increased, and the width of the yoke connecting portion of the outer diameter portion is reduced.

[0006]

[Function] With this configuration, the magnetic pole teeth are attached to the yoke core.
By making the mating portion tapered so that it becomes smaller in the outer diameter direction, an outward force acts on the yoke between the magnetic pole teeth in the radial direction. Even when there is a dimensional error or processing burr at the time of mating with the core part, it is possible to prevent the yoke core core from spreading in the radial direction and affecting the inner diameter of the magnetic pole teeth.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a stator of a motor using a split stator core in which a magnetic pole core 1 and a yoke core 7 are engaged. In FIG. 2, 1 is a magnetic pole core, 2 is a magnetic pole tooth, 3 is a magnetic pole connecting portion, 4 is a mating portion, 5 is a slot, 6
Is a winding. In FIG. 3, 7 is a yoke core, 8 is a yoke, 9 is a mating groove, and 10 is a yoke connecting portion.

The operation of the split stator core of the electric motor configured as described above will be described below. First, FIG.
In the magnetic pole part core 1, a plurality of magnetic pole teeth 2 are connected to each other by a thin ring-shaped magnetic pole connecting part 3 on the inner diameter side, and are formed in a star shape. The outer diameter side of the magnetic pole teeth 2 is tapered at an angle θ that becomes smaller in the outer diameter direction . In the drawings of the present embodiment, the inner diameter side dimension a of the mating portion 4 is wider than the width dimension b of the magnetic pole teeth for the convenience of winding. Also, in FIG.
The yoke core 7 forms a plurality of engagement grooves 9 for engaging the engagement portions 4 of the magnetic pole teeth 2. The engagement groove 9 is sufficiently large with respect to the width c of the yoke 8, and the yokes 8 are connected to each other by a yoke connecting portion 10 having a small width d at the outer periphery. Now, in FIG. 1, after the winding 6 is wound around the slot 5,
When the magnetic pole part core 1 and the yoke core 7 are mated as shown in FIG. 1, the mating part 4 of the magnetic pole teeth 2 is tapered at an angle θ in the outer diameter direction on the yoke 8 between the magnetic pole teeth 2. Therefore, the forces of F1 and F2 in the direction of the arrow act on the yoke 8, and the resultant force becomes F3, and the force for pushing the yoke 8 in the outer diameter direction acts. At this time, since the width dimension d of the yoke connecting portion 10 connecting the yokes 8 is sufficiently small, the yoke 8 spreads in the outer diameter direction with a small force. Therefore, even if there is a dimensional error or a processing burr in the mating portion of the two, the inner diameter of the magnetic pole portion core 1 does not change during the mating. Accordingly, the gap between the rotor 11 and the rotor 11 does not become non-uniform.
In addition to preventing contact with the inner diameter of 2 and preventing generation of vibration and noise due to non-uniform gap, it is possible to obtain a motor having a smaller air gap in design, and to improve the characteristics of the motor. In addition, by extending the engagement portion 4 of the magnetic pole teeth 2 in the radial direction, the winding is wound in a deep slot at the time of the winding operation, and the winding is prevented from spilling into another slot, so that the space factor is particularly high. This is effective for the winding of the motor.

[0010]

[0011]

As described above, according to the present invention, the engagement portion of the magnetic pole teeth which engages with the yoke core is formed in a tapered shape which becomes smaller in the outer diameter direction. By increasing the size and reducing the width of the yoke connecting part of the outer diameter part, it is possible to obtain a split stator core that does not cause a dimensional change in the inner diameter of the core, so that the gap between the rotor and the rotor is not uniform. Does not occur, vibration and noise can be prevented from occurring, and the gap can be made smaller. Therefore, it is possible to provide an electric motor using a split stator core having more excellent characteristics. Further, since the slots are deepened when winding the windings, the windings are prevented from being spilled, and when windings having a high space factor are applied, a more advantageous and great effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric motor using a split stator core in which a magnetic pole part core and a yoke part core are joined according to an embodiment of the present invention.

FIG. 2 is a sectional view of a magnetic pole core according to an embodiment of the present invention.

FIG. 3 is a sectional view of a yoke core according to one embodiment of the present invention;

FIG. 4 is a sectional view of a stator of a motor using a conventional split stator core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic pole part core 2 Magnetic pole teeth 4 Mating part 7 Yoke part core 9 Mating groove 10 Yoke connecting part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeo Inaki 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-83949 (JP, U) JP-A-2-129157 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02K 1/00-1 / 34

Claims (1)

(57) [Claims] 1. A magnetic pole tooth core in which a plurality of magnetic pole teeth whose inner diameters are connected in a ring shape are formed in a star shape, and a magnetic pole tooth outer diameter side.
Of the same shape as the tip of the magnetic pole teeth arranged on the circumference
Substantially annular yoke iron with correspondingly arranged mating grooves
The magnetic pole tooth core after winding the core
An electric motor that fits the tip and the yoke core fitting groove
Stator core of the machine, the magnetic pole tooth tip and
The shape of the fitting groove is formed in a tapered shape that becomes smaller in the outer diameter direction, and the bottom of the fitting groove and the yoke portion iron are formed.
When fitting the dimension between the outer circumference of the core and the taper shape,
Small enough to be easily deformed by the force
A split stator core for an electric motor.