JPH104640A - Stator for small-sized motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a highly efficient stator by forming a magnetic circuit, containing magnetic poles, around which windings of three phases are respectively wound, so that the magnetic resistance of the circuit in each phase can become equal to another. SOLUTION: A single stator core body is constituted of group-A magnetic poles 31-36, integrally formed with a stator yoke 30, and separated group-B magnetic poles 41-46. Since the stack, in which the yoke 30 and the magnetic poles 31-36 are united in one body, has a wide space between each magnetic pole, windings can be wound around the magnetic poles in normal winding and in prescribed shapes, when the windings are wound directly. On the other hand, windings can be wound in normal winding around the group-B magnetic poles 41-46 in prescribed shapes in a state where small spaces can be left between the windings of the magnetic poles 31-36 and 41-46. A stator core set is formed, by mounting the group-B magnetic poles 41-46, wound with windings at the gaps 69 of the yoke 30 at which windings are wound around the magnetic poles 31-36, and a stator is completed by connecting the winding wound around each magnetic pole to another. Therefore, a highly efficient three-phase stator is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a small motor, and more particularly, to a structure of a stator for a small motor used for powering an FA device, an OA device, or a peripheral device of a computer. .

[0002]

2. Description of the Related Art FIG. 18 is a plan view of a stator core of a conventional small motor, which is formed by an annular yoke 1 and a plurality of magnetic poles 2 radially implanted in the yoke 1. A predetermined number of iron cores are laminated and fixed to form a stator core laminate, and a winding is inserted from an opening 2-1 at an end of an adjacent magnetic pole 2 of the stator laminate to wind the winding. However, the winding work for inserting the winding through the narrow opening is very difficult. Furthermore, when the winding operation is mechanized, the needle of the winding machine enters the opening and the winding is applied. Since the winding cannot be applied to the space where this needle moves, the space factor of the winding There is a problem that cannot be increased.

In order to solve such a problem, many structures have been proposed and put into practical use. As an example, FIG.
The configuration shown in FIG. 1 is composed of an annular stator yoke 11 and a plurality of magnetic poles 1.
After winding the winding 14 around the magnetic pole 12 and pressing it into the above-mentioned annular stator yoke 11, the tips of a plurality of adjacent magnetic poles 12 are arranged as shown in FIG. Each of the magnetic poles 12 of the star-shaped iron core is connected to each other at a narrow short-circuit portion 12-2 to form a star-shaped iron core as shown in FIG.
, And press-fitted into the annular stator yoke 11 shown in FIG. 12 to form a stator. This structure has a feature that the winding operation is high in the configuration in which the winding is wound around the star-shaped iron core. However, all the magnetic poles 12 are separated from the stator yoke 11 and the tip of the magnetic pole is short-circuited. Therefore, there is a defect that the magnetic efficiency is reduced.

In another example, as shown in FIGS. 15 to 17, a plurality of magnetic poles 22 are separated from an annular stator yoke 21, and windings 24 are wound around the individual magnetic poles 22. The stator is formed by press-fitting the yoke 21. In this configuration, since the magnetic poles 22 are all separated, the efficiency of the winding operation is low, but since the tip of the magnetic pole is not short-circuited, the magnetic efficiency is high. In some cases, work efficiency is improved.

[0005]

In the above-mentioned prior art configuration, it is necessary to insert a winding through a narrow opening, so that when winding is performed manually, much experience and skill are required. In addition, when a dedicated winding machine is used, a large capital investment is required. Further, in the prior art in which the magnetic pole portion is separated from the yoke portion in order to increase the winding efficiency, since all the magnetic poles are separated, an increase in the magnetic resistance of the separated portion causes a decrease in efficiency. In the present invention, the winding can be performed by a general-purpose winding machine without using an expensive dedicated winding machine as described above, and the efficiency of forming a winding with aligned winding and a high space factor can be formed. It is an object of the present invention to obtain a small-sized motor stator having a high speed.

[Means for Solving the Problems]

A stator for a small motor according to the present invention is a stator core comprising an annular stator yoke and a plurality of magnetic poles radially arranged on the stator yoke. And a plurality of magnetic poles (B) separated from the stator yoke. Windings are wound around the plurality of magnetic poles (A) and the magnetic poles (B), respectively. The plurality of magnetic poles (B) mounted on the stator yoke are mounted at separated predetermined positions, and the plurality of magnetic poles (A) and the windings respectively wound on the magnetic poles (B) are connected. The three-phase windings are formed such that the magnetic resistance of a magnetic circuit including a magnetic pole on which the windings forming the three phases are wound is equal to each other.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a stator core of a small motor according to the present invention.
1, 32, 33, 34, 35, 36 are A group magnetic poles, 41, 42, 43, 4, which are integral with the stator yoke 30.
Reference numerals 4, 45, and 46 denote B group magnetic poles separated from the stator yoke 30, 61 to 68 depressed half dowels for fixing the stator yoke 30, and 51 to 54 denote B group magnetic poles 41 to 46. The magnetic poles of the B group are pressed out in a state where a cut 69 is made with the yoke, and a predetermined number of the magnetic poles are stacked. The pole pieces of the group are joined together by dowels 51-54 to form a stator core stack 30-A. FIG. 2 is a detailed view of the magnetic poles of the B group.

FIG. 3 is a diagram showing a state where the magnetic poles of group B are separated from the stator core stack 30-A.
Is formed integrally with the stator yoke 30 and the magnetic poles 31 to 36 of the A group, (b) is the magnetic poles 41 to 46 of the B group separated from the stator yoke 30, and 69 is
This is a cut between the magnetic poles of the group and the stator yoke 30.

The stator core stack 30-A in which the stator yoke 30 and the magnetic poles 31 to 36 of the A group shown in FIG. 3A are integrated has a space between the magnetic poles because the adjacent magnetic poles are only the A group. When the winding is wound directly around the magnetic pole with a winding machine, it can be wound by a general-purpose winding machine equipped with a normal nozzle, and can be wound to a predetermined shape by aligned winding. .

FIG. 4 shows a conventional stator iron core wound by a winding machine. FIG. 4 shows a conventional stator iron core as shown in FIG. 1
When the needle n of the winding machine is inserted through the opening 2-1 at the tip of the plurality of magnetic poles 2 arranged radially inside the inner diameter of the magnetic pole 2 and the winding is wound around the magnetic pole 2, the deflection angle θa of the needle n is 1
In the range of the slot pitch, the space in which the winding can be performed is limited to a range excluding the space in which the needle can operate, and a large space is formed between the windings 4 wound around the adjacent magnetic poles 2 as shown in FIG. a is left.

On the other hand, when the stator core stack 30-A shown in FIG. 3 according to the present invention is wound by a winding machine, as shown in FIG.
1 and the magnetic pole 32 and between the magnetic pole 31 and the magnetic pole 36 are wide,
Since the deflection angle θb of the needle n can be made sufficiently large, it can be wound around the A group magnetic poles 31 to 36 to the extent that a small space is left with the winding of the B group magnetic pole to be mounted later. It becomes possible.

On the other hand, the magnetic poles 41 to 46 of the group B separated from the stator yoke 30 are formed by a usual winding machine so that the magnetic poles of the group A adjacent to each other are left with a small space enough to leave a small space. The winding can be wound with the aligned winding so as to have the shape of. In this way, the distance between the windings wound around the magnetic poles of the adjacent groups A and B becomes extremely small when the magnetic poles of the group A and the magnetic poles of the group B are mounted later. Since the same number of turns can be wound, the adjacent magnetic poles 31 as shown in FIG.
4-A wound on the magnetic pole 41 and the winding 4 wound on the magnetic pole 41
Only a small space b is left between B and B, and it can be seen that a larger number of windings can be wound in the present invention than in FIG.

The windings 4-A are connected to the magnetic poles 31 to 36 of the group A.
Are wound at the cut 69 of the stator yoke 30 on which
By mounting the magnetic poles of the B groups 41 to 46 on which the -B is wound, a stator core set is formed, and the windings wound on the respective magnetic poles are connected to complete the stator.

The stator constructed in accordance with the present invention has a group A magnetic pole winding 4-A and a group B magnetic pole winding 4-A disposed adjacently as shown in the partial cross-sectional view of FIG. B
The gap b is extremely narrow and indicates that the winding is well packed in the space between the magnetic poles, and more windings can be wound than the stator by the conventional means.

FIG. 8 schematically shows a magnetic circuit of a stator core and a rotor of a servo motor constructed by using the present invention. The magnetic poles a1, a2, a3, a4, a5, and A5 of the A group are shown.
a6 and magnetic poles b1, b2, b3, b4, b5, b6 of group B
The windings wound around the magnetic poles a1, b1, a4, and b4 are connected in series to form a U-phase.
2, b2, a5, and b5 are connected in series to form windings.
Phases are formed, and windings wound around the magnetic poles a3, b3, a6, and b6 are connected in series to form a W phase, thereby forming a three-phase winding as shown in FIG.

In order to make the impedance of each phase of the servomotor equal, it is necessary to make the resistance of the magnetic circuit of the magnetic pole around which the winding of each phase is wound equal. In the schematic diagram of the magnetic circuit including the stator core and the rotor core shown in FIG. 8, Ra1, Ra2, Ra3, Ra4, Ra5, Ra6: the magnetic resistances of the magnetic poles of group A Rb1, Rb2, Rb3, Rb4, Rb5, Rb6: Magnetic resistance of magnetic poles of group B Rg1: Magnetic resistance of air gap Rr: Magnetic resistance of rotor Rc: Magnetic resistance of separated part of magnetic pole of group B Ry: Magnetic resistance of yoke part When U, V, W The magnetic resistance of each phase is as shown in FIG. 10, and Ru = ｛Ra1 + Rg1 + Rr + Rg1 + Rb1 + Rc + Ry + Ra
4 + Rg1 + Rr + Rg1 + Rb4 + Rg1 + Rc + Ry} Rv = ｛Ra2 + Rg1 + Rr + Rg1 + Rb2 + Rc + Ry + Ra
5 + Rg1 + Rr + Rg1 + Rb5 + Rg1 + Rc + Ry｝ Rw = ｛Ra3 + Rg1 + Rr + Rg1 + Rb3 + Rc + Ry + Ra
6 + Rg1 + Rr + Rg1 + Rb6 + Rg1 + Rc + Ry｝. Since the iron core is formed symmetrically, the magnetic resistances of the magnetic poles A group and B group are equal, and the resistance Rc of the separation part of the magnetic poles of the B group is equal.
Are the same for each phase, so that the magnetic resistance of each phase is the same. The number of magnetic pole separation parts is 1 of the total number of magnetic poles.
With / 2, the magnetic resistance can be reduced as compared with the case of the above-described prior art example in which the number of separated portions is equal to the number of magnetic poles.

[0017]

As described above, the stator of the small motor according to the present invention has a structure as described above, so that a larger number of windings can be arranged on each magnetic pole than in the prior art and three-phase windings can be formed. A highly efficient three-phase stator can be obtained with the same magnetic resistance.

[Brief description of the drawings]

FIG. 1 is a plan view of a stator core of a small motor according to the present invention.

FIG. 2 shows the magnetic pole B of the stator core of the small motor according to the present invention.
FIG.

FIG. 3 is a detailed view of a stator core stack of a small motor stator according to the present invention.

FIG. 4 is an explanatory view showing a case where a winding is wound around a stator core according to a conventional technique by a winding machine.

FIG. 5 is a cross-sectional view showing the accommodation of the winding when the winding is wound according to the related art.

FIG. 6 is an explanatory view of a case where a winding is wound around a stator core according to the present invention by a winding machine.

FIG. 7 is a cross-sectional view showing a winding fit when a winding is wound around a stator core according to the present invention.

FIG. 8 is a schematic diagram of a magnetic circuit of a servomotor using the stator according to the present invention.

FIG. 9 is a schematic diagram showing a three-phase winding of a servomotor using the stator according to the present invention.

FIG. 10 is an explanatory diagram showing the state of the magnetic resistance of the magnetic circuit of the servomotor using the stator according to the present invention.

FIG. 11 is a partial view showing a structure of a stator of another example of a small motor according to the related art.

FIG. 12 is a partial view showing a conventional yoke shown in FIG. 11;

13 is a partial view showing a state where a winding is wound around the separated magnetic pole of the example shown in FIG. 11;

14 is a partial view showing the state of the tip of the separated magnetic pole in the example shown in FIG. 11;

FIG. 15 is an explanatory view showing a structure of a stator of another example of a small motor according to the related art.

16 is an explanatory diagram of the yoke of the example shown in FIG.

FIG. 17 is a partial view of the separated magnetic pole of the example shown in FIG.

FIG. 18 is a plan view of a stator core of a small motor according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 The yoke part of the conventional stator core 2 The magnetic pole part of the conventional stator core 2-1 The opening of the tip of the magnetic pole part of the conventional stator core 4 Winding 4-A The winding wound on the magnetic pole A 4- B Winding wound around the magnetic pole B 11 Stator yoke of another conventional example 12 Magnetic pole of another conventional example 12-2 Short-circuit portion at the tip of the magnetic pole of another conventional example 14 Winding of another conventional example Line 21 Stator yoke of another conventional example 22 Magnetic pole of another conventional example 24 Winding of another conventional example 30 Yoke portions 31, 32, 33, 34, 35, 36 of the stator core according to the present invention Magnetic pole part A 41, 42, 43, 44, 45, 46 integrated with yoke part of stator core according to the present invention Magnetic pole part B 30-A separated from yoke part of stator core according to the present invention Stator core stacks 61 to 68 Half dowels 51 to 68 for connecting magnetic pole portions A 51 to 54 magnetic poles Nozzle portion n winding machine to separate the pole B of the dowel 69 of the yoke of the half blanking connecting the B

Claims (2)

[Claims] 1. A stator core comprising an annular stator yoke and a plurality of magnetic poles radially disposed on the yoke, a plurality of magnetic poles (A) integral with the stator yoke, and the stator yoke. A plurality of magnetic poles (B) separated from each other, windings wound around the plurality of magnetic poles (A) and the magnetic poles (B), and the plurality of magnetic poles (B) wound with the windings. ) Is mounted at a predetermined position separated from the stator yoke, and the windings wound around the plurality of magnetic poles (A) and the magnetic poles (B) are connected to form a three-phase winding. A magnetic circuit including a magnetic pole on which a winding forming each of the three phases is wound is formed such that the magnetic resistance of each phase is equal to each other. Motor stator. 2. The small motor stator according to claim 1, wherein the windings wound around the plurality of magnetic poles (A) and (B) are aligned windings.