JP2001045683A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure balance of the magnetic flux density of a stator by changing the external shape of the stator. SOLUTION: The angular part of a triangular external shape of a stator 10 of an inner rotor type motor is made rounded, and both first slot 11 that is short in the radial direction of stator 10 and is small in the groove area and second slot 12 that is long in the radial direction and is large in the groove area are provided with each slot by six pieces. The first slot 11 is formed at the side of polygonal shape, the second slot 12 is formed at the angular side of a polygon, these first and second slots 11, 12 are provided adjacently, and these first and second slots are provided continuously at every other two slots. Moreover, the first and second slots 11, 12 are formed to divide the teeth of the stator 10 into two sections with a vertical line from the top of a triangle to the bottom. A coil is formed at every other five pitches, and a single-phase coil is used to form the three-phase two-pole with a coil provided between the first and second slots 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator structure of an inner rotor type electric motor used for a compressor of an air conditioner or the like, and more particularly, to a structure of a magnetic flux density of a yoke portion even if the outer shape of the stator is not circular. The present invention relates to a motor capable of achieving balance.

[0002]

2. Description of the Related Art An electric motor has a rotor on the inside and a stator positioned outside the rotor to generate a rotating magnetic field. In the case of a 12-slot stator, for example, FIG. It has the structure shown. In FIG. 3, the outer shape of the stator 1 is circular, and twelve slots 2 are formed in the same shape at equal intervals in the circumferential direction. Therefore, there is an advantage that it is easy to manufacture and the like. In addition,
Reference numeral 3 denotes a hole inside the stator 1 for accommodating the rotor.

When an electric motor having the stator 1 having the above-described structure is used for a compressor of an air conditioner, the outer shape of the stator 1 is circular. Not very good, compressor quality,
The performance is inferior. Therefore, for example, as shown by a broken line in FIG. 3, when the outer shape of the stator 1 is made substantially polygonal close to a circle, a gap is formed on the outer periphery of the stator 1, so that the refrigerant and the refrigerating machine oil can easily pass through. This improves the quality and performance of the compressor.

Therefore, for example, if the outer shape of the stator 1 is made to be a polygon having a small number of corners and the gap at the outer peripheral portion of the stator 1 is made larger, the refrigerant and the refrigerating machine oil can pass more easily, and the quality and performance of the compressor can be improved. Can be further improved, and the material of the stator can be reduced.

[0005]

However, in the above-described electric motor, if the outer shape of the stator 1 is polygonal, there are long and short distances between the outer periphery of the stator 1 and each slot 2.
In addition, the smaller the number of polygons, the larger the difference in the distance between the polygons. Therefore, the magnetic flux density in the yoke part partially increases, and the magnetic flux density in the yoke part of the stator 1 becomes unbalanced. There is a disadvantage that performance is reduced.

The present invention has been made in view of the above problems, and has as its object to balance the magnetic flux density of the yoke even when the outer shape of the stator approaches a triangle.
An object of the present invention is to provide an electric motor capable of improving the quality and performance of a compressor and the like without lowering the motor performance.

[0007]

In order to achieve the above object, the present invention comprises a rotor and a stator located outside the rotor for generating a rotating magnetic field, wherein the stator has a predetermined number of magnetic fields. In the electric motor in which the grooves of the slots are formed at equal intervals in the circumferential direction, the outer shape of the stator is polygonal, and the slots are at least short in the radial direction of the stator and have a small slot area. And a second slot which is longer in the radial direction and has a larger groove area. The first slot is formed on a side of the polygon, and the second slot is formed on a corner of the polygon. Forming a winding between the first slots at predetermined slot intervals, applying a winding between the second slots at predetermined slot intervals, and winding between the first slots. And the winding applied between the second slot Are obtained one phase winding, the number of phases of the motor one-phase winding said, characterized in that in order to form as many poles minutes by the.

The present invention comprises a rotor and a stator positioned outside the rotor to generate a rotating magnetic field, wherein the stator has 12 slots formed at equal intervals in the circumferential direction. An electric motor, wherein the outer shape of the stator is triangular, and three corners of the triangle are rounded or flattened, and the slot is at least short in a radial direction of the stator and has a small slot area. And a second slot having a longer groove area and a larger groove area in the same radial direction, wherein the first slot is formed on a side of the polygon,
The second slot is formed on the corner of the polygon, the first slot and the second slot are adjacent to each other at every other slot pitch, and the first slot and the second slot are also arranged at every two slot pitch. The first and second slots are formed so that a second slot is formed in a continuous manner, and the teeth of the stator are divided in half by a vertical line vertically lowered from a virtual vertex of the triangle to the base. Is formed, and the winding for one phase of the electric motor is constituted by two windings which are opposite to each other.
The other winding was applied between the first slots at an interval of 5 slots, and the other winding was applied between the second slots at an interval of 5 slots. The present invention is characterized in that a three-phase two-pole is formed such that the winding and the winding provided between the first slots face each other.

Preferably, the number of turns of the winding provided between the second slots is greater than the number of turns of the winding provided between the first slots. The wire diameter of the winding provided between the second slots is preferably larger than the wire diameter of the winding provided between the first slots. Thereby, the magnetic flux density of the yoke portion of the stator can be easily adjusted, and if the number of turns and the linearity of the windings are optimally determined, it is possible to optimize the balance of the magnetic flux density, Motor performance can be improved.

[0010] The winding of each phase wound on the stator is connected in series,
Alternatively, the phases may be connected in parallel or in series and the constituent windings may be star-connected or delta-connected. As described above, a known connection method can be used.

It is preferable that the above-described stator is incorporated into an electric motor. If the electric motor is a compasser of an air conditioner, the performance of the air conditioner can be improved.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. In the figure, the same parts as those in FIG.

In FIG. 1, the stator 10 of this inner rotor type motor has a substantially triangular outer shape, that is, the three corners of an equilateral triangle are rounded (or cut flat), and are shortened in the radial direction of the stator 10. A first slot 11 having a small groove area and a second slot 12 which is longer in the radial direction and larger in groove area are formed at equal intervals in the circumferential direction, and the first slots 11 are arranged at every other slot pitch.
And the second slot 12 are made adjacent to each other, and the first slot 11 and the second slot 12 are formed so as to be continuous at an interval of two slots, and vertically lowered from the virtual vertex of the triangle to the base. First and second slots 11 and 12 are formed so that the teeth of the stator 10 are divided in half by a vertical line. The outer shape of the stator 10 greatly rounds the three vertices (corners) of the triangle, and the vertices may be rounded along the same circle.

The pair of adjacent first slots 11,
11 is formed on the side of the triangle, and a pair of adjacent second slots 12 and 12 are formed on the corner (rounded side) of the triangle, and the pair of first slots 11 and 11 and the pair of first slots 11 and 11 are formed. The two slots 12, 12 are formed at positions facing each other. As a result, the stator 1
The distance from the second slot 12 to the outer circumference of the stator 10 is substantially the same.

A case in which a three-phase two-pole winding is applied to the stator 10 having the above structure will be described with reference to a developed schematic diagram of FIG. The numbers in the slots in FIG. 2 correspond to the slot numbers given in FIG.

In FIG. 2, for example, a U-phase winding is formed by connecting two windings 13a and 13b in series.
a is applied between the five slot pitches of the second slot 12 of the slot number 6 and the second slot 12 of the slot number 11, and the winding 13b is formed between the first slot 11 of the slot number 5 and the slot number 12 of the slot number 12. This is performed between the first slot 11 and the five-slot pitch.

The V-phase winding has two windings 14a and 14b.
Are connected in series, and the winding 14a has a slot number 2
Between the 5th slot pitch of the second slot 12 of the second slot 12 and the second slot 12 of the slot number 7,
First slot 11 of slot number 1 and slot number 8
Of the first slot 11 in the five-slot pitch.

The W-phase winding has two windings 15a, 15b.
Are connected in series, and the winding 15a has a slot number 3
Between the 5th slot pitch of the second slot 12 of the second slot 12 and the second slot 12 of the slot number 10, and the winding 15b
Is performed between the five slot pitches of the first slot 11 of the slot number 4 and the first slot 11 of the slot number 9.

Therefore, in the case of three-phase two-pole, the windings 13a, 13b, 14a, 14b, 1
5a, 15b, one of the windings 13 having the same magnetic pole
a, 14a and 15a are respectively buried in the second slot 12 having a large groove area, and the other windings 13b, 14b and 15a
b is buried in the first slot 11 having a small groove area. The winding 13a, the winding 13b, and the winding 14a
And the winding 14b and the winding 15a and the winding 15b are reverse winding. The U-phase windings 13a and 13b, the V-phase windings 14a and 14b, and the W-phase windings 15a and 15b are star-connected.

According to the stator 10 having the above-described structure, for example, when current is supplied from the U-phase to the V-phase, the U-phase windings 13a and V
The phase winding 14b generates a magnetic field (for example, N pole) in the same direction, and the U-phase winding 13b and the V-phase winding 14a generate a magnetic field (for example, S pole) in the same direction. Similarly, a rotating magnetic field is generated in the stator 10 by sequentially energizing.

The groove shape of the second slot 12 is elongated in the radial direction of the stator 10, and
The distance from 2 to its outer circumference and the distance from the first slot 11 to its outer circumference are not so different. Therefore, the balance of the magnetic flux density of the yoke portion of the stator 10 is maintained, and a decrease in motor performance can be suppressed.

Further, since the outer shape of the stator 10 is substantially triangular, when the motor is applied to a compressor, the passage area of the refrigerant (gas) and the refrigerating machine oil can be increased, and a high-quality, high-performance compressor can be provided. Obtainable. Therefore, the performance of the air conditioner using the compasser can be improved, and the core material of the stator 10 can be reduced, that is, the cost can be reduced.

The number of windings 13a, 14a and 15a is larger than the number of windings of windings 13b, 14b and 15b.
a, 14a, 15a have wire diameters of windings 13b, 14b, 15
It is better to make the diameter larger than the wire diameter of b. Thereby, the stator 10
The magnetic flux density of the yoke portion can be more balanced, and if the number of turns and the winding alignment are optimally determined, the magnetic flux density can be optimized and the motor performance can be improved. .

In the above embodiment, the windings of each phase are connected in series. However, they may be connected in parallel or in series, and the windings of each phase are connected to a stator. May be applied to the delta connection method.

Further, in the above embodiment, the case where the shape of the stator 10 is substantially triangular has been described, but the stator may be polygonal. In this case, similarly to the above embodiment, the slots of the polygonal stator are formed at equal intervals in the circumferential direction, and this slot is formed of at least a slot long in the radial direction of the stator and a slot short in the radial direction. There are two types. The long slot is formed at a corner of the polygon, and the short slot is formed at a side of the polygon.

In addition, a winding is applied between the long slots at a predetermined slot pitch in accordance with the phases and poles of the motor, and a winding is applied between the short slots at a predetermined slot pitch. Further, a single-phase winding may be obtained by the winding, and the single-phase winding may be formed by the number of phases and the number of poles of the electric motor, and may be star-connected or delta-connected.

[0027]

According to the present invention described above, the following effects can be obtained. The stator of the electric motor according to the present invention has a polygonal outer shape, and has two types of slots, a first slot having a short slot in the radial direction of the stator and having a small groove area, and a second slot having a long slot in the radial direction and having a large groove area. And a first slot is formed on a side of the polygon, a second slot is formed on a corner of the polygon, and a winding is applied to the first and second slots to form a magnetic flux to be a magnetic pole of the electric motor. Therefore, the distance from the first slot to the outer periphery of the stator and the distance from the second slot to the outer periphery are not so different, and the balance of the magnetic flux density of the yoke portion of the stator is not so large. Thus, there is an effect that a decrease in motor performance can be suppressed.

Further, since the stator has a triangular outer shape, when the motor is applied to a compressor, the area through which the refrigerant and the refrigerating machine oil pass increases, and the quality and performance of the compressor can be improved. Moreover, since the core material of the stator can be reduced, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view illustrating an embodiment of the present invention and illustrating a stator of an electric motor.

FIG. 2 is a schematic development view for explaining windings applied to the stator shown in FIG. 1;

FIG. 3 is a schematic plan view for explaining a conventional motor stator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Stator 11 1st slot (short groove; small groove area) 12 2nd slot (long groove; large groove area) 13a, 14a, 15a Winding (5 between 2nd slots)
13b, 14b, 15b winding (5 windings between first slots)
Pitch winding)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Tsukamoto 1116 Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa F-term in Fujitsu General Limited (Reference) 5H002 AA06 AB04 AE08 5H603 AA09 BB01 BB07 BB12 CA01 CA05 CB16 CC05 CC17 CD21

Claims (6)

[Claims] 1. A rotor comprising: a rotor and a stator positioned outside the rotor to generate a rotating magnetic field, wherein a predetermined number of slots are formed in the stator at equal intervals in the circumferential direction. In the electric motor, the outer shape of the stator is polygonal, and the slot is at least a first slot which is short in the radial direction and has a small groove area, and a second slot which is long in the radial direction and has a large groove area. And the first slot is formed on a side of the polygon, and the second slot is formed on a corner of the polygon. A predetermined slot is provided between the first slots. Winding is performed, and winding is performed between second slots at predetermined intervals of a slot, and one winding is formed between the first slot and the second slot. Phase winding, and the one-phase winding is used as the number of phases of the motor. And an electric motor formed by the number of poles. 2. An electric motor comprising a rotor and a stator positioned outside the rotor to generate a rotating magnetic field, wherein 12 slots are formed in the stator at equal intervals in the circumferential direction. Along with making the outer shape of the stator a triangle,
The three corners of the triangle are rounded or cut flat, and the slot is at least a first slot that is shorter in the radial direction and has a smaller groove area, and a second slot that is longer in the radial direction and has a larger groove area. The first slot is formed on the side of the polygon, the second slot is formed on the corner of the polygon, and the first slot and the second slot are formed at every other slot pitch. And the first slot and the second slot are formed so as to be adjacent to each other at every two-slot pitch, and the vertical slot vertically lowered from the virtual vertex of the triangle to the base is formed by the vertical line. The first slot and the second slot are formed so as to divide the teeth of the stator into halves, and the winding for one phase of the electric motor is composed of two windings opposite to each other. One of the wires is applied between the second slots at an interval of 5 slots, and the other winding is applied between the first slots at an interval of 5 slots. An electric motor, wherein a three-phase two-pole is formed by opposing positions of a winding provided between the second slots and a winding provided between the first slots. 3. The electric motor according to claim 1, wherein the number of turns of the winding provided between the second slots is greater than the number of turns of the winding provided between the first slots. 4. The method according to claim 1, wherein the wire diameter of the winding provided between the second slots is larger than the wire diameter of the winding provided between the first slots. An electric motor as described. 5. The winding of each phase wound on the stator is connected in series, parallel or series-parallel, and each phase is formed by star connection or delta connection of constituent windings. , 2, 3 or 4. 6. The method according to claim 1, wherein said stator is incorporated.
The electric motor according to 2, 3, 4, or 5.