JP2969483B2 - Electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a structure in which a winding is wound directly around an iron core.

[0002]

2. Description of the Related Art An electric motor generally has an iron core having a plurality of teeth extending in a comb-like manner toward an axis to form an opening called a slot. The winding is inserted and mounted on the part from the axial direction. However, when such a winding is mounted, the winding end protrudes largely from the axial end face of the iron core, and the axial dimension increases. In addition, such a winding end does not generate an effective magnetic flux in the iron core, causes a resistance loss, and is a useless winding that generates heat. In view of this, an electric motor in which a winding is wound around a yoke, that is, a toroidal winding is attempted, and a great effect is obtained by reducing the waste of the winding and reducing the axial dimension. However, such motors also have some problems. In order to wind the winding around the ring-shaped yoke portion, the winding cannot be easily applied unless the yoke portion is divided, and this division has caused unfavorable phenomena in terms of manufacturing and characteristics. For example, there is trouble in joining the divided iron cores and disturbance of magnetic resistance at the joining portion, and there is a problem as a motor requiring high efficiency and low noise.

[0003] Even if there is no such disturbance of the magnetic resistance, it is difficult to obtain sufficient roundness when the iron core is divided and wound, and then joined, so that it suffers from vibration and noise. Such a problem is that if the power supply current is controlled by an element such as a thyristor to control the number of revolutions, the waveform of the power supply current is not a sine wave, so that extremely large vibrations and noises are generated in synchronization with the generated harmonics. It has been confirmed that.

Therefore, it is conceivable to wind the winding without dividing the stator core. As described in Japanese Patent Application Laid-Open No. 63-110228, the slots of the main winding and the auxiliary winding are respectively formed in the radial direction. The windings are wound at different depths. In such a stator core, since the main winding and the auxiliary winding can be wound without dividing the stator core, the problem of dividing the stator core can be solved. However, since the main winding and the auxiliary winding each overlap in the radial direction, the radial dimension tends to be somewhat large. Of course, by increasing the size of the stator core in the radial direction, the main winding and the auxiliary winding do not interfere with each other, which is preferable for insulation. On the other hand, electric motors attached to various types of equipment are necessarily required to be miniaturized.
In particular, for fan motors such as air conditioners, low noise and miniaturization are major issues.

The present invention has been made in view of such circumstances, and has as its object to provide an electric motor that realizes low noise and small size.

[0006]

According to the present invention, a tooth portion is formed by three poles protruding toward an axis in an E-shape, a first winding is applied to a first winding portion, and a tooth portion is formed. In a motor in which a second winding is provided between a pole adjacent to the auxiliary pole and a pole adjacent to and beyond the auxiliary pole, an object is achieved by arranging the auxiliary pole and the pole adjacent to the auxiliary pole in parallel. Have achieved.

[0007]

The space around which the first winding is wound becomes larger in the circumferential direction by parallelizing the pole around which the second winding is wound with the auxiliary pole, so that the space for the first winding is increased. The portion can be made smaller in the radial direction. Then, the adjacent poles approach each other via the auxiliary pole around which the second winding is wound, which also increases the space around which the second winding is wound in the circumferential direction. The space in which the two windings are wound can be reduced in the radial direction. Therefore, each space around which the first winding and the second winding are wound increases in the circumferential direction, and accordingly becomes smaller in the radial direction, so that the outer diameter of the stator core can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a perspective view showing a main part of a stator core of a motor according to the present invention, and FIG. FIG. 3 is a main part plan view, and FIG. 3 is a main part enlarged plan view for comparison with a conventional electric motor. FIG. 4 is a longitudinal sectional view of a main part showing a state in which a first winding and a second winding are wound around a stator core.

In FIG. 1, an electric motor includes a first winding 2 and a second winding 2 on a stator core 1 constituting an outer shell with a donut-shaped yoke.
The first winding 2 has a winding 3 on its outer peripheral side.
And six second windings 3 are provided on the inner peripheral side. The first winding 2 is wound around a first winding part 4 formed on the inner periphery of the stator core 1 toward the axis.
The second winding 3 is wound around an E-shaped tooth portion 5 on the inner diameter side of the first winding portion 4. The second winding 3 has an E-shaped tooth portion 5 composed of three poles 5a, 5b, and 5c. It is wound around. Further, the first winding 2 is connected via a lead wire 7 as an auxiliary winding connected to a capacitor (not shown), and the second winding 3 is connected as a main winding, thereby constituting a capacitor-type motor. doing. Further, the stator core 1 is housed in a frame (not shown), or is constituted by a mold member such as a premix, and is configured to house a rotor (not shown). In FIG. 2, the tooth portion 5 of the stator core 1 is configured such that three poles 5a, 5b, 5c are formed in an E-shape. The magnetic flux surface 8 is formed so as to face. Lines 9a, 9b, 9c in the figure indicate that the pole 5a, the auxiliary pole 6, and the pole 5c are formed in parallel, respectively. Then, the lines 10a and 10b in the figure
Indicates a range in which the nozzle swings when the second winding 3 is wound, and an arrow 11 therebetween indicates a position where the second winding 3 is wound. Lines 12a and 12b in the figure are
Each shows the range in which the nozzle swings when the first winding 2 is wound, and the arrow 13 between them indicates the range in which the first winding 2 is wound. Further, the centers at which these nozzles oscillate are somewhat uneven in the radial direction from the axis A of the stator core 1, and the first winding 2 and the second winding 3 are gradually arranged in the circumferential direction of the stator core 1. The trajectory indicating the center of the swinging movement for winding is shown by the line B.

In FIG. 3, the stator core 1 has poles 50a, 50b, 50c and auxiliary poles 60 extending toward the axis A by solid lines, and the poles 5a, 5b shown in FIG. , 5c are shown for comparison. Lines 14a and 14b extend from the stator core 1 axis to the pole 5
This shows a state in which the nozzle enters a slot formed between Oa and the auxiliary pole 60 and between the pole piece 50c and the auxiliary pole 60. In this case, the swing center of the nozzle is located at the axis of the stator core 1.

Referring to FIG. 4, a first winding 2
Is wound, and the shaft 15 indicated by a solid line is shown.
Is the shaft 15 of the winding machine located at the axis of the stator core 1, and the shaft 16 indicated by the dotted line is the shaft 16 of the winding machine when the swing position is eccentric. The shaft 15 is provided with a nozzle 17, and the first winding 2 is drawn out of the nozzle 17 via the shaft 15. The dimension C indicates the distance by which the swinging position of the shaft 15 is eccentric from the point A shown in FIG. The shafts 15 and 16 reciprocate in the axial direction of the stator core 1 regardless of the position, and the state is indicated by a dotted line in the figure. The stator core 1 is configured to be rotated by a winding machine because it is necessary to wind six first windings 2 and second windings 3 in the circumferential direction, and holds the stator core 1. A gear 19 is connected to the jig 18.

In such a configuration, the electric motor is formed by punching a steel plate into a predetermined shape by pressing, laminating the steel plate, winding the first winding 2 and the second winding 3, and attaching and fixing the lead wire 7. The child core 1 is formed. Then, a rotor and the like are attached by a frame (not shown) and assembled.

In such an assembly, the stator core 1
Since the poles 5a and 5c forming the tooth portion 5 and the auxiliary pole 6 are configured in parallel, the gap formed between them, that is, the slot, is positioned at the axis of the nozzle on the locus B. Then, the chance of contact with the auxiliary pole 6 or the poles 5a and 5c is minimized. Of course, if the distance between the poles 5a, 5c and the auxiliary pole 6 is large without being on this trajectory, the nozzle can move up and down in the axial direction through the space between the slots without any trouble. However, in order to reduce the outer diameter of the motor, it is necessary to compress the configuration of the tooth portion 5 in the radial direction. Is preferable.
Such a tendency becomes more remarkable as the number of slots decreases. When the poles 5a and 5c and the auxiliary pole 6 are formed in parallel in this way, as shown in FIG. 3, the second pole formed between the pole 5a and the pole 5b or between the pole 5C and the pole 5b is apparent. The space in which the winding 3 is wound becomes large, and the radial dimension of the tooth portion 5 can be reduced accordingly. Of course, when the tooth portion 5 increases in the radial direction, the space around which the first winding 2 is wound can also be increased in the circumferential direction, and the radial direction can be reduced accordingly. Accordingly, the outer diameter of the stator core 1 can be reduced by increasing the space in which the first winding 2 and the second winding 3 are wound in the circumferential direction and reducing the space in the radial direction. It can contribute to downsizing of the motor. In addition, since the poles 5a and 5c respectively approach the auxiliary pole 6,
In particular, the outer diameter side of the second winding 3 is close to each other, and the portion of the second winding 3 on the end face of the stator core 1 is shortened. When the second winding 3 is wound, the poles 5a and 5c are parallel to each other, so that the wound second winding 3 can be wound without being unevenly distributed. That is, when the second winding is wound around the poles 50a, 50c indicated by solid lines in FIG. 3, the poles 50a, 50c are respectively extended toward the axis, and therefore, in the circumferential direction, the axis Is closer to the inner part, and especially the first part of the winding to be wound will be biased to the inner diameter side, and may be pushed to the inner diameter side by the wire wound later. There is. If such a phenomenon occurs, the rotor may come into contact with the second winding 3, and it is necessary to shape the second winding 3. However, when the poles 5a and 5c are parallel as shown by the dotted line in FIG. 3, such a disadvantage is reduced.

[0014]

According to the present invention, since the poles for winding the second winding are made parallel with the auxiliary poles, the winding amount of both the first and second windings can be increased in the circumferential direction. Since the radial direction can be reduced accordingly, a motor having a small outer diameter can be obtained. Further, it is not necessary to divide the stator core, and it is possible to obtain a small and quiet electric motor without problems such as uneven distribution of magnetic flux which causes vibration and noise.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a stator core of a motor according to the present invention.

FIG. 2 is a plan view of a main part of a stator core.

FIG. 3 is an enlarged plan view of a main part for comparison with a conventional electric motor.

FIG. 4 is a longitudinal sectional view of an essential part showing a state in which a winding is wound around a stator core with a first winding and a second winding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stator core 2 ... 1st winding 3 ... 2nd winding 5 ... Tooth part 6 ... Complementary pole A ... Shaft center B ... Trace 17 ... Nozzle

Claims (1)

(57) [Claims] A ring-shaped yoke portion is formed on the outer periphery, a plurality of auxiliary poles protruding axially toward the inner circumference side of the yoke portion, and a main pole formed between the plurality of auxiliary poles. Forming a first winding portion protruding axially from the yoke portion on the main pole,
A tooth portion is formed by three poles protruding toward the axis in an E-shape on the inner diameter side of the first winding portion, a first winding is applied to the first winding portion, and the complementary pole of the teeth portion An electric motor in which a second winding is provided between a pole adjacent to a pole and a pole adjacent to and beyond the pole, wherein the pole and the pole adjacent to the pole are arranged in parallel. .