JP2935062B2 - Induction motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction motor having a structure in which winding is easy and a winding end is small.

2. Description of the Related Art An induction motor having a main winding and an auxiliary winding has a number of teeth extending from a ring-shaped yoke, and a main winding and an auxiliary winding are formed in slots formed between the teeth. The lines are individually stored.

In such a configuration, the windings cannot be wound between adjacent slots due to the formation of the magnetic path of the induction motor, and the slots on which one winding is mounted are spaced apart. Will be.

Therefore, a long winding end portion extending between the slots provided separately from the main winding and the auxiliary winding is formed, which significantly increases the winding length.

[Problems to be Solved by the Invention] Such winding ends are not only electrically ineffective, but also generate heat due to resistance loss, and vary depending on the thickness of the stator core. Since it occupies half of the length, the material cost and weight, and the outer shape are increased, so that there is a problem that the space factor in the device is deteriorated.

These problems have a serious adverse effect on the equipment used to form a small-sized induction motor, such as obstruction of the ventilation path of the ventilation fan, reducing the air volume or generating turbulence, resulting in noise. And the overall size becomes large.

On the other hand, in the manufacturing process such as assembly, since the winding end is long, the defect rate due to the material of the winding is high, and when it is put in a slot, it is liable to be damaged and defective. The end of the wire must be shaped, which not only takes a long time to manufacture, but also increases the chances that the winding will be damaged, thus deteriorating the quality.

In addition, such manufacturing defects are difficult to repair,
Excessive quality control was required.

In order to solve such a problem, an induction motor in which a yoke portion is wound in a toroidal shape has been considered, and its effect has been improved.

However, in this case, the winding cannot be easily wound unless the ring-shaped yoke portion is divided, so that the manufacturing is not easy.

In particular, after splitting the yoke and applying windings, if the junctions are joined, the magnetic flux will be disturbed due to resistance in the magnetic path, and furthermore, there will be problems such as the stator core vibrating, It had problems such as causing noise.

Further, since the winding protrudes on the outer peripheral side of the yoke, it cannot be accommodated in the iron plate frame, and even if it is devised, the magnetic flux from the winding leaks, causing a problem that torque is reduced.

Further, there is a problem that it takes a lot of man-hours to insulate the slot portion of the stator core and to form a screw hole for fastening an iron plate (bracket) in the frame.

The present invention has been made in view of such circumstances, and it is easy to assemble windings and the like with a small size, there is little occurrence of defects, and it is possible to easily install insulation of a slot portion and a steel plate bracket. It is intended to provide an induction motor.

[Means for Solving the Problems] According to the present invention, a ring-shaped yoke portion is formed in an iron core, and an auxiliary winding winding portion extending from the yoke portion to the inner diameter side is erected. A main winding winding portion having three teeth projecting in the inner diameter direction is formed on the inner diameter side of the winding winding portion, and the center tooth portion of the main winding winding portion is straightened, and the tooth portions on both sides are formed. In each, a magnetic action part whose inner diameter side end extends toward the central tooth part is formed, and a winding part is formed by the auxiliary winding part and the tooth part. An induction motor that is arranged as a stator core by stacking a plurality of cores that are arranged on the inner diameter side of the yoke part and that form magnetic pole parts that stand up from the yoke part to the inner diameter side between adjacent winding parts In the above, the entire periphery of the stator core except the inner periphery is pre-molded with an insulating resin, and a plurality of bracket fastening protrusions are formed simultaneously with the pre-molding. The problem is solved by forming an individual unit, winding an auxiliary winding around the auxiliary winding winding unit, and winding a main winding around the adjacent main winding winding unit.

[Operation] The auxiliary winding wound around the auxiliary winding winding portion of the stator core is a portion radially protruding from the ring-shaped yoke portion. In contrast to the conventional one that extends over the provided slot, there are almost no winding ends, and most of them are effective portions for forming a magnetic path.

Furthermore, since the main winding winding portion around which the main winding is wound is wound between the adjacent tooth portions, the winding end portion is extremely similar to the winding of the auxiliary winding. Less.

The magnetic path generated by the auxiliary winding and the main winding forms a magnetic pole by connecting the respective windings over the adjacent winding part, and a plurality of magnetic poles such as two poles and four poles are formed. Of the induction motor can be configured. In addition, by integrally forming the resin member at the time of forming the pre-mold, the steel plate bracket can be easily attached.

[Embodiment] The present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a diagram showing a relationship between a stator core and a winding of an induction motor according to an embodiment of the present invention. Yes, Figure 2 shows
It is a perspective view of the stator core to which the winding was given. FIG.
FIG. 4 is a longitudinal sectional view assembled by a steel plate frame, and FIG. 4 is a longitudinal sectional view assembled by a frame molded by premixing or the like.

FIG. 5 is a perspective view of a main part showing a relationship between a stator core and a winding, FIG. 6 is a perspective view of a main part showing a state in which winding is performed, and FIG. FIG. 4 is a vertical sectional view of a main part showing one embodiment of a structure for insulating a child core.

In FIG. 1, the induction motor has a ring-shaped yoke portion 2 on the outside of a stator core 1, and an auxiliary winding winding portion 3 stands radially on the inner diameter side of the yoke portion 2. It has been formed.

Further, three teeth 5a, 5b, 5c are formed in an E-shape at the inner diameter end of the auxiliary winding 3 to form the main winding 6.

The main winding winding part 6 and the auxiliary winding winding part 3 form a tree-shaped winding part 7 that is integrally erected from the yoke part 2 in the inner diameter direction.

The winding portion 7 has slots formed around the auxiliary winding portion 3 and around the tooth portions 5a, 5b, 5c forming the main winding portion 6, respectively.

Further, the tooth portions 5a, 5b, 5c are formed in a straight shape in which the central tooth portion 5b extends to the radially inner side, and the tooth portions 5a, 5c formed on both sides of the central tooth portion 5b. The end portions on the inner diameter side extend toward the central tooth portion 5b to form a magnetic action portion 5x.

Further, the winding portions 7 are continuously provided at intervals of six along the inner periphery of the yoke portion 2, and stand between the adjacent winding portions 7 in the radial direction from the yoke portion 2. A magnetic pole portion 8 to be provided is formed.

Such a stator core 1 is formed by stacking punched steel plates to a required thickness. Pre-molding or insulating paper is attached to the slots of the stator core 1, and then winding is performed.

This winding comprises an auxiliary winding 9 and a main winding 10.
The auxiliary winding 9 is wound around the auxiliary winding winding part 3, and the main winding 10 is provided with the tooth part 5 c adjacent to the tooth part 5 a via the magnetic pole part 8.
It is wound around.

Further, the auxiliary winding 9 and the main winding 10 are connected in a state of being electrically connected to each other to form predetermined poles, and the auxiliary winding 9 has a capacitor for adjusting a phase. Is connected.

That is, the auxiliary winding 9 wound around one auxiliary winding winding part 3 is configured to be wound around the adjacent auxiliary winding winding part 3 in a connected state without cutting. I have.

Of course, even if the auxiliary winding 9 is not wound on the adjacent portion in the connected state, it is also possible to cut it once and connect it in the next step.

A rotor 11 is provided on the inner diameter side of the stator core 1, and is configured to be supported by a frame via a bearing as shown in FIGS. 3 and 4.

Arrows 12 and 13 in the figure indicate the flow 12 of the magnetic flux generated by the auxiliary winding 9 and the flow 13 of the magnetic flux generated by the main winding 10, respectively.
The rotors 11 and 2 are configured to rotate as an induction motor.

In FIG. 2, the stator core 1 on which the auxiliary winding 9 and the main winding 10 are wound has a yoke portion 2 exposed to the outside and is laminated in a donut shape. The auxiliary winding 9 and the main winding 10 are exposed at the portion.

The stator core 1 is mounted on a frame as shown in FIG. 3 or FIG. 4, and a rotor 11 is disposed inside the stator core 1.
Are supported by bearings attached to the frame to form an induction motor.

In FIG. 3, the induction motor is mounted on a frame 14 formed by drawing and shaping a steel plate on a completed stator obtained by winding an auxiliary winding 9 and a main winding 10 around a stator core 1, The frame 14 is provided with bearings 15a and 15b,
The rotor 11 is rotatably supported via a shaft 16.

A hood 18 is provided on the load-side frame 17, and ventilation is performed by a fan 19 formed integrally with the end ring of the rotor 11, as shown by an arrow 20 in the figure.
It is configured to provide internal cooling.

In FIG. 4, the induction motor has a frame 21 formed by molding with a molding member such as a premix, and a steel plate 22 for supporting the rotor 11 via a bearing. 22 frame
A resin member 23 is buried in advance in the inside of 21, and a screw 24 is screwed into the resin member 23 for assembly.

The resin member 23 has one end 25 as shown in FIG.
Has a small hole for the screwing of the screw 24, and the other end 26 is slightly thinner so as to be inserted and mounted in the slot of the stator core 1.

The mounting of such a resin member 23 to the stator core 1 is as follows.
After the auxiliary winding 9 and the main winding 10 are wound around the stator core 1, insertion can be easily performed by inserting the auxiliary winding 9 and the main winding 10 into the gaps left in the slots.

It is easy to mount the resin member 23 as shown in FIG. 5 in this way, but when the stator core 1 is insulated by a pre-mold or an insulating member, such a pre-mold or an insulating member is used. The same effect can be obtained by protruding a resin member having the same shape as the resin member 23.

In any case, since the auxiliary winding 9 and the main winding 10 are wound by nozzles, respectively, the fishing line is wound tightly without loosening the wire as in the case where the fishing line is wound on a reel. The insertion of 23 does not cause an obstacle such as the auxiliary winding 9 and the main winding 10 being pushed out of the slot, and can be easily implemented.

FIG. 6 shows a state in which the nozzle 27 of the winding machine acts on the stator core 1, and the auxiliary winding 9 comes out from the tip portion 28 of the nozzle 27 and is wound around the auxiliary winding winding portion 3. Is done.

The nozzle 27 is configured to be able to ascend in the axial direction from a gap 29 a formed between the tooth portion 5 a of the stator core 1 and the magnetic pole portion 8, and to exceed the end of the stator core 1. As shown by a dotted line in the figure, the distal end portion 28 swings in the circumferential direction and descends the adjacent gap 29b.

Then, such an operation is repeated so that the auxiliary winding part 3
And the auxiliary winding 9 is wound around the auxiliary winding.

At this time, even if the resin member 23 is erected on the end face of the stator core 1, no problem occurs.

The same operation is performed when the main winding 10 is wound. In this case, it is preferable to use a short nozzle 27.

That is, the winding of the main winding 10 is performed in the tooth portion adjacent to the tooth portion 5a.
5c, the nozzle 27 becomes closer to the axis of the stator core 1 and if the nozzle 27 swings around the axis of the stator core 1, the nozzle 27 must be shortened inevitably.

Such a nozzle 27 is formed in a pipe shape, and has a hollow portion through which a winding is wound around a predetermined portion.

Of course, in addition to rotating the nozzle 27, the nozzle 27 may be fixed and the stator core 1 may be rotated, or the winding machine may be configured to move both. Since the winding machine needs to wind a winding around the winding part 7 adjacent to the stator core 1,
Normally, the stator core 1 is configured to rotate at intervals of slots, and is configured to be sequentially wound around the winding unit 7.

In FIG. 7, the stator core 1 includes a pre-mold 30
The insulating layer 30a is formed by the
3 and a partition 31 are formed.

The pre-mold 30 is formed by forming a donut-shaped stator core 1 and then placing it in a molding die and injecting a resin member into a predetermined portion. It is formed by curing a resin filled in a gap formed therebetween.

Accordingly, a member having an arbitrary shape can be formed by a molding die. For example, the resin member 23 for attaching the steel plate 22 is formed, and the partition wall 31 that insulates the auxiliary winding 9 from the main winding 10 is formed. Can be formed.

Of course, the present invention is not limited to the pre-mold 30 as described above. The insulating layer 30a is formed by forming a thin insulating member covering the outer periphery of the stator core 1 and mounting it so as to wrap the stator core 1. Even in this case, the resin member 23 and the partition wall 31 can be formed on the insulating member in advance.

That is, when the auxiliary winding 9 and the main winding 10 are respectively wound, they run only in the circumferential direction without running in the radial direction, so that these work can be easily performed.

In such a configuration, the induction motor forms a donut-shaped stator core 1 by punching a steel plate into a predetermined shape by pressing and laminating the steel plate.

Then, the stator core 1 is insulated by pre-molding or the like, the auxiliary winding 9 is applied to the auxiliary winding 3, and then the main winding 10 is applied to the main winding 6.

For such a winding, a nozzle 27 holding the winding is inserted into a slot from the inner diameter side of the stator core 1 and then moved up and down in the axial direction, and swings right and left at the end of the stator core 1. The auxiliary winding 9 is wound around the auxiliary winding 3 and the main winding 10 is wound around the main winding 6.

Usually, such a nozzle has a speed of 500 to 700 revolutions per minute, and it can be performed in about one minute to wind a winding of 300 to 600 turns.

Therefore, in this embodiment, there are six auxiliary windings 9 and six main windings 10, and the winding is applied to one stator core 1 in 10 to 15 minutes except for the time for setting the winding machine. be able to.

Such a time is longer than a conventional method of inserting and mounting a winding in a slot from the axial direction, but a process such as shaping of a winding mounted on the stator core 1 is not required, or The time required for fabrication is short rather than the conventional one.

Thus, the auxiliary winding 9 and the main winding 10
Is wound and energized, a magnetic flux is generated as shown by arrows 12 and 13 in the figure.

The magnetic flux generated from the auxiliary winding 9 is
As indicated by an arrow 12, a magnetic flux flowing radially outward is generated in the central auxiliary winding part 3 of the series of auxiliary windings 9, and this magnetic flux is generated in the adjacent auxiliary winding part 3 in the radial direction. It becomes a magnetic flux flowing inward, and forms a series of magnetic fluxes acting on the rotor 11.

At this time, a part of the magnetic flux also passes through the teeth 5a and 5c as shown by the arrow 12 in the figure, and the rotor 11
Act on.

Accordingly, the area facing the rotor 11 increases, the magnetic resistance decreases, and the magnetic flux distribution approaches a sine curve, so that an efficient magnetic induction action can be obtained for the rotor 11.

The operation of such a magnetic flux is the same for the main winding 10, and the current flows through the main winding 10 wound between the teeth 5a and 5c of the adjacent main winding winding portion 6. And a magnetic flux as shown by an arrow 13 in the figure is generated, and a magnetic flux flowing radially outward is generated in the magnetic pole portion 8 around which the central main winding 10 of the series of main windings 10 is wound, Magnetic flux flows through a magnetic path formed via the magnetic pole portions 8 on both sides thereof.

Even in this case, the magnetic flux is transmitted only through the magnetic pole portion 8 to the rotor.
Since it does not act on the rotor 11 but acts on the rotor 11 via the magnetically acting portions 5x of the teeth 5a and 5c, the area facing the rotor 11 increases, the magnetic resistance decreases, and , The magnetic flux distribution approaches the sine curve and the rotor
11 can be affected by magnetic induction.

Therefore, a high torque can be obtained in the rotor 11, and an efficient induction motor can be obtained, and the induction motor can be downsized accordingly. Resistance can be reduced and the fan efficiency can be increased.

In the embodiment shown in FIG. 1, an induction motor having 24 slots and 6 poles is shown. However, knitting to an arbitrary pole such as 4 poles can be similarly implemented by the present technology.

On the other hand, when the auxiliary winding 9 and the main winding 10 are wound, as shown in FIG. 6, the nozzle 27 of the winding machine is positioned from the inner side of the stator core 1 to the outer side in the radial direction of the stator core 1. It is very easy because it can be easily extended inside.

That is, when the auxiliary winding 9 is wound around the auxiliary winding part 3, a nozzle 27 extending radially outward from the inner diameter side of the stator core 1 is formed between the tooth part 5a and the magnetic pole part 8. Gap 29
a, 29b so that it can be inserted and moved in the lamination direction (axial direction) of the steel plate of the stator core 1, and when passing the end of the stator core 1, the tip 28 of the nozzle is moved in the circumferential direction. And the auxiliary winding 9 is wound around the next auxiliary winding 3.

When the auxiliary winding 6 and the main winding 10 are wound around the stator core 1 in this manner, the ends of the windings are pulled out so that electricity can be supplied.

When energized, a magnetic flux having a phase difference of approximately 90 ° is generated by a capacitor (not shown) connected to the auxiliary winding 9 with respect to the main winding 10, and the rotor 10 can be rotated.

As an example of mounting a stator in which main and auxiliary windings are wound around the stator core 1 on a frame, as shown in FIG. 3, the stator may be mounted on a frame 14 formed by drawing a steel plate. In this case, it is particularly preferable to form the fan 19 on the rotor 11 and to ventilate it with the air guide plate 18 or the like.

In such ventilation, the gap 29 formed between the magnetic pole portion 8 and the tooth portion 5a in the stator core 1 serves as a ventilation path, and the stator core 1 can be cooled very effectively.

Therefore, the effect as an induction motor of forced air cooling can be expected.

Also, as shown in FIG. 4, when the frame 21 is formed by resin molding using a premix or the like, the same effect as that of an existing molded motor can be obtained, and a quiet and well-insulated induction motor can be obtained.

And the characteristic that it can be formed in a small size is recognized.

Also, mold molding by premix is described in
-118368, JP-A-52-41810 and JP-A-54-31504 may be used.

In such an induction motor, in terms of magnetic characteristics, the magnetic action of the main winding 10 that generates torque on the rotor 11 reduces the circumferential width of the magnetic pole portion 8, and the adjacent tooth portions 5a, 5c The width of the magnetic acting part 5x is formed by increasing the width of the magnetic acting part 5x in the circumferential direction, so the distribution of the magnetic flux acting on the rotor 11 becomes a sine curve, the occurrence of vibrations is reduced, and the quiet operation can be recognized. Can be

Further, the winding is not limited to the present embodiment, and the auxiliary winding winding portion 3
The main winding 10 is wound around the main winding 10 and the auxiliary winding 9 is wound around the main winding 6.

Further, the main winding 10 and the auxiliary winding 9 are each provided with a tap, that is, the terminal can be easily pulled out to change the connection position of the power supply. In this case, the speed change can be easily performed.

[Effects of the Invention] According to the present invention, when the auxiliary winding and the main winding are wound on the stator core, the winding ends are substantially eliminated, and the output 25
The copper dose was reduced by about 30% in the stator core with a laminated thickness of 25 mm in W when compared with the conventional one.

The effect obtained by this is that the copper loss is reduced, the calorific value is reduced, and the winding end is eliminated as in the motor with the toroidal winding on the yoke portion, so that an extremely small induction motor can be formed. .

In addition, the auxiliary winding and the main winding can be wound without dividing the stator core, and the magnetic flux on the stator side facing the rotor approaches the sine curve, resulting in less magnetic unevenness and quietness without vibration. In addition, a highly efficient induction motor can be obtained, the production is extremely easy, and the total effect thereof is extremely large in industry.

Further, since the resin member for fastening the iron plate is formed at the same time as the pre-molding, there is no need to newly provide a member for fastening the iron plate to the frame, so that the structure is simplified and the assembly is facilitated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a stator core and windings of an induction motor according to one embodiment of the present invention, and FIG. 2 is a perspective view of a stator core on which windings are applied. . FIG. 3 is a longitudinal sectional view assembled by a steel plate frame, and FIG. 4 is a longitudinal sectional view assembled by a frame molded and shaped by a premix or the like. FIG. 5 is a perspective view of a main part showing a relationship between a stator core and a winding, FIG. 6 is a perspective view of a main part showing a state in which winding is performed, and FIG. FIG. 4 is a vertical sectional view of a main part showing one embodiment of a structure for insulating a child core. 1 ... stator core, 2 ... yoke section, 3 ... auxiliary winding section, 5a, 5b, 5d ... magnetic action section, 6 ... main winding section,
7 ... winding part, 8 ... magnetic pole part, 9 ... auxiliary winding, 10 ...
Main winding, 11 ... rotor.

Claims (1)

(57) [Claims] 1. A ring-shaped yoke portion is formed on an iron core, and an auxiliary winding winding portion extending from the yoke portion to an inner diameter side is erected, and an inner diameter side of the auxiliary winding winding portion is provided. A main winding winding portion having three teeth protruding in the radial direction is formed on the main winding portion, and a central tooth portion of the main winding winding portion is straightened. Forming a magnetic action portion extending toward a central tooth portion; forming a winding portion by the auxiliary winding winding portion and the tooth portion; and providing a plurality of the winding portions on the inner diameter side of the yoke portion In the induction motor, a stator core is formed by laminating cores each having a magnetic pole portion erected from the yoke portion to the inner diameter side between the adjacent winding portions, and the stator core is disposed inside the stator core. Pre-molding is performed with insulating resin on the entire periphery except for the peripheral portion. At the same time as this pre-molding, a plurality of bracket fastening protrusions are formed. An induction motor, wherein an auxiliary winding is wound around a wire winding portion, and a main winding winding is wound around the adjacent main winding portion.