JPH0946942A - Stator device of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat radiation and reduce manufacturing cost by arranging core materials so that the jagged parts made around individual magnetic materials may be discontinuous in the direction of stacking. SOLUTION: Cuts 1a, 1c, and 1e are made at the periphery of a core material 1. This core material is made so that the position of its periphery edge may lie along the specified circumference the distance from the center of the core material to which is fixed, at the sections 1b, 1d, and 1f other than the cuts 1a, 1d, and 1e at the periphery of the core material 1. At the lower part of a stator core 2 are the cuts 1c and the projections 1d of the core material 1 drawn up every ten sheets alternately, so fins F are made of them. Therefore, the surface area of the periphery of the core 2 is very large, and the heat generated by the heat generation, etc., of the electric coil wound around the projections 4a-4l of the core material 1 can be let go efficiently to outside of the stator core 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator device for an electric motor.

[0002]

2. Description of the Related Art An electric motor has a stator and a rotor,
At least one of the stator and the rotor has an electric coil that generates a magnetic field for driving. The stator, rotor and electric coil are generally inserted and supported in a housing having a generally cylindrical frame.

For example, a switched reluctance motor (hereinafter referred to as SR motor) is constructed as shown in FIG. That is, the rotor R of the SR motor is an iron core formed by simply stacking iron plates, and a plurality of teeth (pole portions) formed on the outer periphery of the rotor R so as to project toward the stator surrounding the iron core. It has Ra, Rb, Rc, .... Further, the stator S has each tooth Sa of the iron core formed by stacking iron plates,
Sb, Sc, ... Are respectively electric coils Ca, C
b, Cc, Cd, ... Are concentratedly wound.
The teeth of the stator are formed on the inner peripheral surface so as to project toward the rotor existing inside thereof. In this type of SR motor, the poles Sa, Sb, Sc, ... Of the stator S operate as electromagnets, and the poles Ra, Rb, R of the rotor R are operated.
The rotor rotates by attracting c, ... With the magnetic force of the stator. Therefore, the coils Ca, Cb, C wound around the respective poles of the stator according to the rotational position of the respective poles of the rotor
By sequentially switching the energization states of c, ...
The rotor can be rotated in the desired direction.

[0004]

By the way, when the electric motor is driven, the electric coil heats up in accordance with the current flowing through the electric coil, and the temperature of the electric motor rises. Therefore, when the calorific value is large, sufficient heat radiation is necessary to prevent overheating of the electric motor. In an SR motor with a closed housing, the heat generated by the electric coil is transmitted to the iron core of the stator and then to the external member via the frame of the housing or is radiated to the atmosphere. It In order to efficiently dissipate heat, it is necessary to form a large number of fins and irregularities on the outer circumference of the frame as a radiator so that the contact area between the outer surface of the electric motor and the atmosphere becomes large. .

However, when a large number of fins and irregularities are formed, the frame structure becomes complicated, which increases the manufacturing cost of the electric motor and increases the outer size of the electric motor. .

Therefore, it is an object of the present invention to efficiently dissipate heat from an electric motor, suppress an increase in manufacturing cost, and reduce the size of the electric motor.

[0007]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, there is provided an electric machine having a core formed by laminating a plurality of thin plate magnetic materials and an electric coil wound around the core. In a motor stator device: an uneven portion (1) on at least a part of the outer periphery of each of the magnetic material (1).
a, 1b, 1c, 1d) are formed, and the magnetic material is laminated in a state in which the positions of the uneven portions are displaced from each other at a predetermined number of the plurality of magnetic materials or at a predetermined interval. The uneven portions are arranged discontinuously with respect to the stacking direction.

According to a second aspect of the present invention, the frame material (3, 4) having a larger thickness than the magnetic material material is provided on both end surfaces of the core (2) formed by laminating the plurality of magnetic material materials. ) Is abutted, and the fixtures (11-16, 21-2) arranged so as to penetrate the frame material and the core.
According to 6), the core and the frame material are integrally formed.

According to a third aspect of the present invention, all of the plurality of magnetic material (1) constituting the core are formed in the same shape, and the relative number in the circumferential direction is set every predetermined number of sheets or every predetermined interval. Due to the displacement, the uneven portions are discontinuously arranged.

The symbols shown in parentheses are reference numerals of corresponding elements in the embodiments described later, but each constituent element of the present invention is a specific element in the embodiments. It is not limited to only.

According to the first aspect, the uneven portions (1a, 1b, 1c, 1) formed on the outer periphery of each magnetic material (1).
d) is arranged discontinuously in the stacking direction. That is, in the discontinuous portion, a gap is formed between the uneven portions adjacent to each other in the stacking direction. Therefore, the uneven portions are arranged on the outer peripheral surface of the core so as to form a plurality of fins. When the core is exposed to the outside, the fins formed on the core are in direct contact with the atmosphere, so that the contact area between the outer peripheral surface of the core and the atmosphere is large, and high heat dissipation efficiency is obtained.

In the present invention, the frame material (3, 4) is brought into contact with both end surfaces of the core (2), and they are integrally formed by the fixing members (11-16, 21-26). To be done. Therefore, it is not necessary to cover the outer peripheral surface of the core (2) with the frame material. Therefore, the electric motor can be configured such that the core of the stator is exposed to the outside.

In the third aspect, the concavo-convex portions are discontinuously arranged by arranging the magnetic material materials (1) having the same shape so as to be relatively displaced in the circumferential direction. As a result, the core can be made of magnetic material having the same shape, so that a cheaper electric motor can be provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the structure of a stator device of the present invention will be described with reference to the drawings. 1 is a front view of the stator device, FIG. 3 is a right side view of the device, FIG. 4 is a left side view of the device, and FIG. 5 is a sectional view taken along line VV of FIG. This stator device can be used as a stator of an SR motor. FIG.
Referring to FIG. 1, this stator device includes a stator core 2 and frame members 3 and 4 arranged at both ends of the stator core 2.
The stator core 2 is formed by laminating a large number of thin plate-shaped core materials 1 each having a substantially ring shape in a plan view in the thickness direction. The core material 1 is composed of an electromagnetic steel plate. Further, the core materials 1 adjacent to each other are electrically insulated. The stator core 2 and the frame members 3 and 4 consist of six sets of bolts 11 to 16 and nuts 21 to 2 which are fixtures.
It is constructed integrally by tightening 6.

As shown in FIG. 6, twelve protrusions 4a to 4l are arranged at equal intervals on the inner circumference of the core material 1, and recesses 5a to 5 are provided between the protrusions adjacent to each other.
1 is formed. Projection 4 of laminated core material 1
Each of a to 4l has 12
The electric coil is wound (see FIG. 9). That is, the protrusions 4a to 4l configure the 12 teeth of the stator core 2, and the recesses 5a to 5l configure the slots.

Notches 1a, 1c and 1e are formed on the outer periphery of the core material 1 as shown in FIG. Portions 1b other than the notches 1a, 1c, 1e on the outer periphery of the core material 1,
In 1d and 1f, the outer peripheral end position is formed along a predetermined circumference with a constant distance from the center of the core material 1.

A large number of core materials 1 constituting the stator core 2.
Are arranged in two different orientations. One is the direction shown in FIG. 6, and the other is the direction shown in FIG. The core material 1 shown in FIG. 7 is the same as the core material 1 shown in FIG.
It is the same as the one rotated 0 degrees. In this embodiment, ten core materials 1 are set as one set, the core materials 1 are arranged in the same direction among them, and the core material 1 is set for each set.
It is arranged so that the direction of turns alternates. For example, the orientation shown in FIG. 6 is A (group), and the orientation shown in FIG. 7 is B.
Assuming (group), the core material 1 is arranged every 10 sheets in the direction of ABABABAB ... According to this structure, on the outer peripheral surface of the stator core 2, the uneven portions 1a, 1b, 1 on the outer periphery of the core material 1 are formed.
Since c, 1d, 1e and 1f are discontinuous in the axial direction (stacking direction), the uneven portion 1 on the outer periphery of the core material 1
A large number of heat radiation fins F are formed on the outer peripheral surface of the stator core 2 by a, 1b, 1c, 1d, 1e and 1f.

For example, on the lower side of the stator core 2 shown in FIG. 1, the cutouts 1c and the projections 1d of the core material 1 are alternately arranged every 10 sheets, so that the fins F are formed by them. Has been done. Further, on the upper side of the stator core 2 shown in FIG. 5, the cutouts 1e and the projections 1f of the core material 1 are alternately arranged every 10 sheets, so that the fins F are formed by them. FIG. 8 is an enlarged view of the portion VIII in FIG. In this embodiment, since the thickness of one core material 1 is 0.35 mm, as shown in FIG.
The thickness of each of the heat radiation fins F formed by the laminated core material 1 of 10 sheets and the distance between the fins is 3.5 mm.
become.

As described above, since a large number of heat radiation fins F are formed on the outer peripheral surface of the stator core 2, the surface area of the outer peripheral surface of the stator core 2 is very large, and the protrusions of the core material 1 are formed. Heat generated by heat generation of the electric coils wound around 4a to 4l can be efficiently released to the outside of the stator core 2. Therefore, it is not necessary to attach a special radiator to the stator core 2, and it is useful for reducing the number of parts constituting the electric motor and miniaturizing the electric motor.

Further, in this embodiment, frame members 3 and 4 having a relatively large thickness are brought into contact with both end surfaces of the stator core 2,
Since they are integrally formed by tightening the bolts 11 to 16 and the nuts 21 to 26, this stator device can be fixed on a desired device at the frame members 3 and 4. That is, since it is not necessary to cover the outside of the stator core 2 with a casing or the like, the outer peripheral surface of the stator core 2 is exposed to the outside as it is, which is extremely excellent in heat dissipation.

As shown in FIGS. 6 and 7, each core material 1
Six holes 31 to 36 are formed through the bolts 11 to 16. The positions of the holes 31 to 36 are on the same circumference with a constant distance from the center of the core material 1, and they are arranged at equal intervals. Therefore, even when the core material 1 is rotated by 60 degrees with respect to the center thereof, the holes 31 to 36 before rotation are rotated.
Any of the holes 31 to 36 is arranged at the same position as.
For this reason, a plurality of core materials 1 that are offset from each other by 60 degrees are stacked, and the bolts 1 are inserted in the holes 31 to 36.
1 to 16 can be passed.

The stator core 2 has a substantially cylindrical shape, and a rotor is arranged inside the stator core 2 as in FIG. However, in this embodiment, the number of teeth of the rotor is eight.

By the way, when the slot shape of the stator core is formed so as to match a predetermined circumferential shape, for example, as shown in FIG. 2, the inner surface 6 of the stator core and the electric coils (Ca, Cb, Cc, ...) is likely to form a gap 7 between the stator core and the electric coil, and the adhesion between the stator core and the electric coil is deteriorated, so that the thermal resistance between the electric coil and the stator core is increased (heat dissipation is improved). Worse), or the mechanical accuracy of holding the electric coil deteriorates.

In this embodiment, as shown in FIG. 9, the teeth 41, 42, 43, ... Of the stator core 2 are
Electric coils 51, 5 each formed by winding a copper wire
2, 53, ... are attached, and electric coils 51, 5
The sectional shapes of 2, 53, ... Are all rectangular. Further, the slot shape of the stator core 2 is devised so that the electric coils 51, 52, 53, ... Can easily come into close contact with the stator core 2. That is, the surface 60 of each slot is composed of two planes so that the slot shape of the stator core 2 matches the sectional shape of the electric coils 51, 52, 53, .... Thereby, the electric coils 51, 52, 5
.. and the stator core 2 are reduced in thermal resistance, and the mechanical accuracy of holding the electric coil is improved.

[0025]

As described above, according to the first aspect, the uneven portion (1) formed on the outer periphery of each magnetic material (1) is used.
a, 1b, 1c, 1d) are arranged discontinuously in the stacking direction, and in the discontinuous portion, a gap is formed between the uneven portions adjacent to each other in the stacking direction. Therefore, the uneven portions are arranged on the outer peripheral surface of the core so as to form a plurality of fins. When the core is exposed to the outside, the fins formed on the core are in direct contact with the atmosphere, so that the contact area between the outer peripheral surface of the core and the atmosphere is large, and high heat dissipation efficiency is obtained.

In the second aspect, the frame material (3, 4) is brought into contact with both end surfaces of the core (2), respectively, and they are integrally formed by the fixtures (11-16, 21-26). To be done. Therefore, it is not necessary to cover the outer peripheral surface of the core (2) with the frame material. Therefore, the electric motor can be configured such that the core of the stator is exposed to the outside.

In the third aspect of the present invention, the concavo-convex portions are discontinuously arranged by arranging the magnetic material materials (1) having the same shape so as to be relatively displaced in the circumferential direction. As a result, the core can be made of magnetic material having the same shape, so that a cheaper electric motor can be provided.

[Brief description of drawings]

FIG. 1 is a front view of a stator device according to an embodiment.

FIG. 2 is a vertical sectional view showing a conventional example of an electric motor.

3 is a right side view of the stator device of FIG. 1. FIG.

4 is a left side view of the stator device of FIG. 1. FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

6 is a front view showing the core material 1 at the position of line VI-VI in FIG. 1. FIG.

7 is a front view showing the core material 1 taken along the line VII-VII in FIG.

FIG. 8 is an enlarged cross-sectional view showing a portion VIII in FIG.

FIG. 9 is a cross-sectional view showing a part of a stator core 2 on which an electric coil is mounted.

[Explanation of symbols]

1: Core material 1a, 1c, 1e:
Notch 1b, 1d, 1f: Convex part 2: Stator core 3,4 Frame member 4a-4l: Projection part 5a-5l: Recessed part 6: Stator core inner peripheral surface 7: Gap 11-16: Bolt 21 -26: Nut 31-36: Hole 41, 42, 43, ...: Teeth 51 of stator core 2, 51, 52, 53, ...: Electric coil 60: Surface of slot

Claims (3)

[Claims] 1. A stator device for an electric motor having a core formed by laminating a plurality of thin plate-shaped magnetic materials and an electric coil wound around the core: each of the magnetic materials. An uneven portion is formed on at least a part of the outer periphery, and the magnetic material is laminated in a state in which the positions of the uneven portions are displaced from each other by a predetermined number of the plurality of magnetic material materials or by a predetermined interval, A stator device for an electric motor, wherein the uneven portions are arranged discontinuously in the stacking direction. 2. A frame material having a thickness larger than that of the magnetic material material is brought into contact with both end faces of the core formed by laminating the plurality of magnetic material materials, respectively. By the fixture arranged so as to penetrate the core,
The stator device for an electric motor according to claim 1, wherein the core and the frame material are integrally formed. 3. The plurality of magnetic material materials forming the core are all formed in the same shape, and the uneven portion is formed by a relative displacement in a circumferential direction at a predetermined number of sheets or at a predetermined interval. The stator device for an electric motor according to claim 1, wherein the stator devices are arranged discontinuously.