JP2000050550A - Toroidal shading coil motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve a power factor by toroidally winding a primary coil and a shading coil on a core of a stationary armature, thereby making a generated magnetic field close to a sine wave. SOLUTION: Two divided units 2a, 2b of substantially semicircular states laterally divided from a core of a stator 2 in a circumferential direction are annularly integrally coupled. Primary coils 10a, 10b or shading coils 11a, 11b are disposed at parts of a plurality of slots 8 formed between a pair of adjacent rib-like cores 6 in a circumferential direction. The coils 10a, 10b and 11a, 11b are mounted on an annular core 5 by a so-called toroidal winding. The coils 10a, 10b and 11a, 11b in the units 2a, 2b are continuously wind over between a plurality of the slots from the start of the coil to the end of the coil. Thus, a distributed coil structure can be easily obtained with a simple structure, and generated magnetic field approaches a sinusoidal waveform to largely improve its power factor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal winding motor in which a shading coil is wound around an iron core in a toroidal shape.

[0002]

2. Description of the Related Art Generally, shaded motors are widely used as small-capacity motors and the like. In the motor shown in FIG. 10, a primary coil SM and a shading coil SN are wound around an iron core SC of a fixed armature S, and a magnetic flux Φ1 formed by the primary coil SM; The rotating magnetic field for the rotor R is formed by the magnetic flux Φ2 formed by the shading coil SN so as to have a predetermined phase difference with respect to the magnetic flux Φ1. The rotating magnetic field created in this shaded motor is elliptical and less effective than a perfect circular magnetic field, but produces a torque in the direction of the rotating magnetic field.

[0003]

However, such a shading motor can have an inexpensive structure,
On the other hand, there is a problem that both the power factor and the efficiency are extremely low. In other words, in the armature of the shaded motor, in order to have a simple structure, the primary coil and the shaded coil are formed into concentrated windings without being distributed windings, thereby facilitating the windings. A good component waveform cannot be obtained, and the power factor, which is the ratio of the active power to the apparent power, is significantly reduced. In addition, the efficiency is poor due to the large loss in the shading coil, and the motor is not meeting recent demands.

[0004] That is, with recent serious global environmental problems, energy saving and power saving have to be promoted with the highest priority. Today, power consumption occupies a large weight. More than half of the power is consumed by the motor. For this reason, increasing the power factor and efficiency of the motor and reducing the loss (power consumption) as much as possible are demanded as top priorities.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a toroidal winding motor in which the power factor and the efficiency are greatly improved by changing the structure of the armature to improve the characteristics.

[0006]

As described above, in the shaded motor, since the primary coil and the shaded coil are wound in a concentrated manner, only about half of the apparent power is finally used. , Power factor and efficiency have been significantly worse. Therefore, in the present invention, toroidal winding is adopted and distributed winding is easily obtained by a simple winding structure, thereby improving the power factor and efficiency.

In general, output and torque are used as indices representing motor characteristics. However, since these vary depending on the applied voltage, the number of turns of the windings, heat radiation conditions and design, etc., the motor characteristics are absolutely required. It is not an indicator of the value. On the other hand, there is an efficiency value as another index, which is a good index indicating the relationship between the output and the loss. After all, it cannot be an absolute index indicating the magnitude of the motor characteristics.

Therefore, in order to improve the motor efficiency value, it is basically necessary to accurately grasp what the motor characteristics and the magnitude of the efficiency are and what they determine.
As a result of the study by the present inventors, the following has been found. The absolute index representing the magnitude of the motor characteristics is a proportional constant value (determining) the relationship between the generated torque and the generated loss (copper loss).
It was found that the copper loss and the proportionality constant in the case of a motor with a magnet were (torque) ² / copper loss. The so-called proportional constant value, which represents the relationship between the torque and the copper loss generated when a certain current flows, does not change even when the applied voltage, the number of winding turns (when the space factor is the same), and the load conditions are changed. Thus, it can be seen that it is an absolute index indicating the magnitude of the motor characteristics. On the other hand, regarding the efficiency value, efficiency = output / input = output / (output + loss), output = rotational speed × torque, the rotational speed is the applied voltage and loss, and the main loss is copper loss. It turned out that it is almost determined by this proportionality constant value.

Enhance motor characteristics (increase efficiency)
For this reason, attempts have been made to increase the size of the magnet, use a high-energy product magnet, or increase the space factor of the winding.However, these factors eventually change the conditions of the factors that determine the proportional constant value. It is obtained by:

Next, the reason why the proportional constant value determines the absolute value of the motor characteristics and the factor that determines the proportional constant value will be described. The torque of the motor is determined by the magnitude of the change in magnetic energy due to the relative movement between the opposed primary and secondary sides. There are two types of magnetic energy generated and held by the primary and secondary side self inductances L and those generated and held by the mutual inductance M between the primary side and the secondary side. The magnetic energy used for the drive differs depending on the type and structure. Induction motors, DC motors, brushless motors and the like use magnetic energy due to mutual inductance M, and reluctance motors use magnetic energy due to self inductance L.

When the structure such as the number of magnetic poles is fixed,
The magnitude of the generated torque with respect to the secondary side and secondary side currents I ₁ and I ₂ is substantially determined by the maximum value of the magnetic energy, and is determined by the so-called self-inductance L and mutual inductance M. The magnitude of the magnetic energy due to the self-inductance L is (１ ／) · L · I ² , and the magnitude of the magnetic energy due to the mutual inductance M is M ·
I ₁ · I ₂ . Most general motors other than the reluctance motor use the mutual inductance M for driving. In many motors that do not use magnets, such as induction motors and universal motors, the primary current I ₁ and the secondary current I ₂ are proportional, so if the current is represented by I, the magnetic energy is M · I ₁ · I ₂ = M · ^{I 2} and expressed. If the motor using a magnet to one side (assuming primary), the magnet is I ₁ fixed for the electromagnet current fixed, for M · I 1 ₌ [Phi (effective magnetic flux), the magnetic energy M · I ₁ · I ₂ =
It can be expressed as Φ · I.

On the other hand, since copper loss is resistance loss, R · I ²
Can be represented by Therefore, the proportionality constant that determines the relationship between torque and copper loss is torque / copper loss without a magnet,
As a result, it can be expressed as L / R or M / R. When a magnet is provided, (torque) ² / copper loss results in M ²
/ R.

Considering the factors that determine L, M, and R, when the number of coil turns has the same effect on all, and is excluded, L and M are mainly the primary and secondary facing area S and the air gap length. g. If a magnet is provided, it further includes the material, physique and shape of the magnet. R is mainly determined by the coil cross-sectional area A and the coil length l per turn of the coil. Considering that the air gap length g and the magnet element are almost fixed, and considering the configuration of the above-mentioned proportional constant only with the main element, the following is obtained. a. Motor without magnet (induction, universal): S · A / l = S / coil element b. Motorized ^{magnet: S 2 · A / l =} S 2 / coil elements c. Reluctance motor: S · A / l = S / coil element As described above, if the main factors constituting the proportional constant are improved and the proportional constant value is increased, the motor characteristics are increased, and as a result, the efficiency value can be improved. I understand.

[0014] From the viewpoint of the above proportional constant value, it can be seen that the conventional rotary electric machine has a major drawback. In other words, a common matter that determines the upper side of the above-described constitutive equation of the proportional constant is the area S of the primary and secondary magnetic facing surfaces. As the facing area S increases, the proportional constant value and the efficiency value may increase. Understand.

Assuming that the magnetic facing surface can be taken up to the full motor space in the axial direction without changing the condition of the coil element, the proportional constant value is greatly improved, and the loss at the same torque (or output) is reduced. Is easily reduced to, for example, 1/2 or 1/3. Such a temporary state is possible to some extent if only the structure for that is considered. That is, it is structurally possible to greatly increase the height of the primary and secondary magnetic facing surfaces without significantly deteriorating the coil element, and by adopting such a structure, the efficiency value is greatly increased. That is, the loss can be significantly reduced.

From such a viewpoint, in the first aspect of the present invention, a rotating magnetic field with respect to the rotor is formed by the fixed armature in which the primary coil and the shading coil are wound around the iron core. Thus, the primary coil and the shading coil of the fixed armature are toroidally wound.

In the invention according to a second aspect, the iron core according to the first aspect includes an annular core surrounding the rotor and a plurality of cores radially protruding from the annular core and facing the rotor. And the shaded coil is distributed-wound so as to be accommodated in at least two or more slots between the circumferentially adjacent opposed core portions.

Further, in the invention according to claim 3, the iron core according to claim 2 is composed of two or four divided bodies in the circumferential direction, and the plurality of divided bodies are divided into the first and second divided bodies.
After the next coil and the shading coil are wound around the annular core portion, they are integrally joined annularly.

Further, in the invention according to the fourth aspect, the primary coil and the shading coil according to the third aspect are independently provided for each of the divided bodies and continuously from the beginning to the end of the winding in each of the divided bodies. Is wound around.

According to a fifth aspect of the present invention, the core height of the opposed core portion in the opposed surface of the second aspect is greater than the core height of the annular core portion.

Further, in the invention according to claim 6, the iron core according to claim 5 is constituted by a laminated core, and at least the opposing core portion of the iron core is partially laminated to enlarge an area facing the rotor. The core portions are provided so as to be stacked.

Further, in the invention according to claim 7, the iron core according to claim 5 is constituted by a laminated core, and at least the outermost laminated plate of the opposed core portion in the iron core is opposed to the rotor. The magnetic flux collecting yoke plate is formed so as to be bent to increase the area.

Further, in the invention according to claim 8, the iron core according to claim 5 is formed of an aggregate of magnetic powder, and at least the opposing core portion of the iron core has an area facing the rotor. The expanding magnetic powder expanding core portion is provided in a thick wall shape.

According to the ninth aspect of the invention, the annular core portion of the iron core according to the first aspect is provided with a projecting portion projecting in a radial direction opposite to the opposite core portion.

In the invention according to claim 10, the fixed armature is a stator of an induction machine.

Further, in the invention according to claim 11, the fixed armature is a stator of an induction machine, and a facing surface between the rotor and the fixed armature is determined based on a core height in a conductive portion of the rotor. Are formed with a large core height.

Furthermore, in the invention according to claim 12,
The rotating electric machine according to claim 1 is a magnet motor including a rotor made of a permanent magnet.

According to a thirteenth aspect of the present invention, the rotating electric machine according to the first aspect is a reluctance motor including a rotor made of a reluctance core.

[0029] According to a fourteenth aspect of the present invention, the rotating electric machine according to the first aspect is a hysteresis motor including a rotor having a hysteresis core.

Further, in the invention according to claim 15, the rotating electric machine according to claim 1 has an inner rotor structure.

Further, in the invention according to claim 16,
The rotating electric machine according to claim 1 is configured in an outer rotor structure.

If the primary coil and the shading coil are toroidally wound around the iron core of the fixed armature as in the present invention, the distributed winding can be performed with a simple winding structure. Since the magnetic flux contributing to rotation becomes a distributed magnetic field by the linear structure, the ratio of the active power to the apparent power, that is, the power factor, is greatly improved by a simple structure.

At this time, if the annular core portion to be toroidally wound has a divided structure as in the present invention, the operation of toroidal winding can be performed extremely easily and efficiently using a winding machine or the like.

Further, as in the present invention, by making the surface of the fixed armature facing the rotor in the iron core larger than the core height of the annular core portion, the proportional constant value can be reduced without deteriorating the coil element. The result is a significant improvement, with the result that the losses are greatly reduced and the efficiency value is dramatically improved.

Further, if the opposing core portion is extended in the radial direction so as to protrude, the flow of magnetic flux in the axial direction becomes smooth.

[0036]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the embodiment shown in FIGS. 1 to 5 applies the present invention to a stator (stator) in an induction type shading motor, and is mounted on an inner peripheral wall of a stator frame 1. The stator 2 is disposed so as to surround the outer peripheral side of the rotor 4 fixed to the rotating shaft 3. The iron core forming the stator 2 is formed of a laminated core, and the annular core 5 is provided so as to constitute a core winding part of the laminated core. A plurality of rib-shaped core portions 6 are integrally provided so as to radially extend at predetermined intervals in the circumferential direction. An opposing core portion 7 facing the rotor 4 is provided at a radially inner end portion of each of the rib-shaped core portions 6.

As shown in FIG. 3, the iron core of the stator 2 is formed by annularly dividing two substantially semicircular divided bodies 2a and 2b into two parts in the circumferential direction. The primary coils 10a, 10b or 10a, 10b, 10a, 10b, The shading coils 11a and 11b are arranged. These primary coils 10a, 10b and shading coils 11a, 1
1b is mounted on the annular core portion 5 by so-called toroidal winding. A group of 1b is wound on each of the two divided bodies 2a and 2b constituting the iron core. ing. That is, these 1
Next coils 10a, 10b and shaded coils 11a, 11b
Are mounted in an independent state for each of the divided bodies 2a and 2b, and each of the coils 10a and 10a in each of the divided bodies 2a and 2b.
10b and 11a, 11b are continuously wound from the beginning to the end of winding over a plurality of slots.
Therefore, these primary coils 10a, 10b and shading coils 11a, 11b can be wound independently for each of the divided bodies 2a, 2b.

At this time, one divided body 2 of the iron core
The primary coils 10a, 10b and the shading coils 11a, 11b corresponding to a or 2b are respectively mounted in four slots shifted in the circumferential direction.
Although one slot is commonly installed for one slot,
The ticket turn portions corresponding to the other slots are mounted so as to be shifted to the opposite side in the circumferential direction. As described above, a set of the primary coils 10a and 10b and the shaded coil 1 wound around each of the divided bodies 2a and 2b of the iron core are formed.
In 1a and 11b, after the two divided bodies 2a and 2b of the iron core are joined together, a wire connection is made between the two divided bodies 2a and 2b. In addition, the shading coil 11
a and 11b may or may not be connected to each other.

The laminated core constituting the iron core is:
FIG. 7B is a diagram in which core pieces obtained by punching a silicon steel sheet into a predetermined shape are laminated in the axial direction, and the laminated body of all the core pieces 12 as shown in FIG. Are further laminated as shown in FIG. That is, the laminated body of all the core pieces 12 constitutes a central portion in the axial direction of the laminated core, and a portion 12 a forming the above-described annular core portion 5 and a radial portion from the annular core portion 5. 1 forming a rib-shaped core portion 6 extending to
2b, and a portion 12c forming an opposing core portion (magnetic pole portion) 7 provided at an inner end portion of the rib-shaped core portion 6, which is shown in FIG. 7A. A predetermined number of all the core pieces 12 having such a shape are laminated in the axial direction, so that the annular core portion 5, the rib-shaped core portion 6 having a predetermined height,
And an opposing core portion (magnetic pole portion) 7. Then, the primary coil 10 or the shading coil 11 is toroidally wound around the annular core portion 5 in which all the core pieces 12 are stacked.

On the other hand, the partial core piece 13 shown in FIG. 7B is composed of a portion forming the rib-shaped core portion 6 and the opposing core portion (magnetic pole portion) 7 excluding the annular core portion 5. In addition, the partially laminated core 14 is formed by further laminating the rib-shaped core portion 6 and the opposing core portion (magnetic pole portion) 7 in the above-described laminated body of all the core pieces 12 from both sides in the axial direction. The partial core pieces 13 constituting the partial laminated core 14 are overlapped so as to further stack the rib-shaped core portions 6 and the opposing core portions 7 of the above-described entire core pieces 12. The partially laminated core 14 is fixed by a laminated caulking 15.

The partially laminated core 15 enlarges the area facing the rotor 4 in the axial direction, and the entire area in the axial direction (lamination direction) of the partially laminated core 14 and the facing core portion 7 is combined. The core height as the lamination thickness is formed larger than the core height as the thickness of the annular core portion 5. Further, the core height as the total lamination thickness of the opposing core portion 7 and the partially laminated core 14 is formed so as to have a height greater than the winding height of the primary coil 10 in the axial direction.

On the other hand, as will be described later, the core height as the thickness of the facing surface of the rotor 4 in the axial direction (lamination direction) is larger than the core height as the thickness of the annular core portion 5. The thickness is formed to be substantially the same as the thickness, so that the partially laminated core 14 faces the rotor 4.

The laminated core constituting the iron core of the rotor 4 also has the same configuration as the laminated core of the stator 2 described above, and particularly, as shown in FIG. A plurality of rib-shaped core portions 16 are integrally provided on the annular core portion 15 so as to extend radially at predetermined intervals in the circumferential direction. Each of the slots defined between a pair of circumferentially adjacent ones is filled with a conductive portion (not shown) formed by aluminum die casting. Further, an opposing core portion 17 facing the stator 2 described above is provided at a radially outer end portion of each of the rib-shaped core portions 16.

Further, a cylindrical ring-shaped copper plate 18 is provided on the inner peripheral portion of the aluminum die cast in the conductive portion, that is, on the end opposite to the opposing core portion 17 so as to form a conductive portion. Thereby, good conductivity is obtained. Further, in order to increase the conductivity of the conductive portion, a rod-shaped copper material can be inserted into each slot, or the entire conductive portion can be made of a copper material.

The laminated core is formed by laminating core pieces obtained by punching a silicon steel sheet into a predetermined shape in the axial direction, and corresponds to a laminated body of all the core pieces 12 having a shape substantially corresponding to FIG. Further, partial core pieces 13 having a shape substantially corresponding to FIG. 7B are further laminated. That is, the laminated body of all the core pieces 12 constitutes the central portion in the axial direction of the laminated core, and the portion forming the above-described annular core portion 15 and the radial portion from the annular core portion 15 are formed. Forming a rib-shaped core portion 16 extending to
And a portion forming an opposing core portion (magnetic pole portion) 17 provided at an inner end portion of the base member. A predetermined number of all the core pieces 12 having such a shape are laminated in the axial direction. Thereby, an annular core part 15, a rib-shaped core part 16, and a facing core part (magnetic pole part) 17 having a predetermined height are formed.

On the other hand, the partial core piece 13 is
Core part 16 and opposed core part (magnetic pole part) 1 excluding
7 are further laminated from both sides in the axial direction with respect to the rib-shaped core portion 16 and the opposing core portion (magnetic pole portion) 17 in the above-mentioned laminated body of all the core pieces 12, and the laminated caulking is performed. 19 fixed. The partial core pieces 13 are overlapped so as to further stack the rib-shaped core portions 6 and the opposing core portions 9 of the above-described entire core pieces 12, whereby a partial lamination made of a laminate of the partial core pieces 13 is performed. A core 21 is formed.

As described above, the partially laminated core 21 increases the area facing the stator 2 in the axial direction, and extends in the axial direction (together with the partially laminated core 21 and the facing core portion 17). The core height as the total lamination thickness in the lamination direction) is formed larger than the core height as the lamination thickness of the annular core portion 15. Further, the core height as the total lamination thickness of the opposing core portion 17 and the partially laminated core 21 is formed so as to have a height substantially equal to the height in the axial direction of the conductive portion.

Further, if necessary, the partial core pieces 12 constituting the partially laminated cores 14 and 21 in the stator 2 and the rotor 4 may be laminated by using a silicon steel sheet having no insulating film. The flow of magnetic flux in the direction (axial direction) is improved.

The laminated core in the stator 2 described above includes:
An overhanging core portion 2 protruding radially outward from the annular core portion 5
5 is formed, and the overhanging core portion 25 is
, The entire stator is fixed.

The embodiment of the invention made by the inventor has been specifically described above. However, the present invention is not limited to the above embodiment, and can be variously modified without departing from the gist of the invention. Needless to say.

For example, in the embodiment shown in FIG. 9, two layers of core pieces 71a respectively disposed at both ends in the laminating direction of a laminated core 71 as an iron core correspond to a portion corresponding to the opposing core portion 71b. In this case, the magnet is bent at a substantially right angle so as to open in the core height direction (vertical direction in the drawing), which is the laminating direction, thereby forming a magnetic flux collecting yoke structure that enlarges the area facing the other side member 72. With such a magnetic flux collecting yoke structure,
The effect can be obtained.

In the embodiment shown in FIG. 9, the pieces 71a are bent into the cores of two layers at both ends in the stacking direction, but may be one layer at each end, and may be adjacent to the core pieces at both ends. It is also possible to bend a magnetic flux collecting yoke structure by bending a core piece of three or more layers. If a magnetic flux collecting yoke structure including such a multilayer core piece is employed, it is possible to prevent the magnetic flux from being saturated by the magnetic flux collection.

Further, although not shown, a configuration in which the height of the opposed core between the primary side and the secondary side is enlarged also by forming the iron core from a sintered body of magnetic powder to form a magnetic powder yoke structure. Can be obtained as well.

Further, in each of the embodiments described above, the inner rotor type is configured, but the outer rotor type may be configured.

Similarly, the present invention can be applied not only to the motor as in the above-described embodiments but also to a generator.

[0056]

As described above, according to the present invention, a distributed winding structure can be easily obtained with a simple structure by toroidally winding a primary coil and a shaded coil around an iron core of a fixed armature. As a result, the generated magnetic field can be made closer to a sinusoidal waveform to greatly improve the power factor, and the efficiency can be greatly improved accordingly.

Further, as in the present invention, by making the opposed surface of the core of the fixed armature larger than the core height of the annular core portion, the relationship between torque and copper loss can be determined without deteriorating the coil element. The constant value can be greatly improved, the loss can be greatly reduced, and the efficiency value and characteristics of the toroidal winding motor can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic semi-longitudinal sectional view showing the structure of a toroidal wound shading induction motor according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the toroidal wound shading induction motor shown in FIG.

FIG. 3 is an explanatory plan view showing a core structure and a winding structure of the toroidal wound shading induction motor shown in FIG. 1;

FIG. 4 is an external perspective explanatory view showing a structure of a stator in FIGS. 1 to 3;

FIG. 5 is an external perspective explanatory view showing the structure of a laminated core constituting the iron core of the stator shown in FIGS. 3 and 4;

FIG. 6 is an explanatory plan view showing a structure of a laminated core of the stator shown in FIGS. 3 and 4;

FIG. 7 is an explanatory plan view showing the shape of a core piece constituting the laminated core shown in FIGS. 3 to 6;

FIG. 8 is a schematic external perspective explanatory view showing a structure of a rotor used in the toroidal wound shading induction motor shown in FIG. 1;

FIG. 9 is a schematic side view showing an embodiment in which the iron core according to the present invention has a magnetic flux collecting yoke structure.

FIG. 10 is an external perspective explanatory view showing a structural example of a general shaded motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator frame 2 Stator 3 Rotating shaft 4 Rotor 5 Annular core part 6 Rib-shaped core part 7 Opposing core part 8 Slot 10 Primary coil 11 Shading coil 12, 13 Laminated core silicon steel plate 14 Partially laminated core 15 Annular core part Reference Signs List 16 rib-shaped core portion 17 opposing core portion 18 copper plate 21 partially laminated core 25 overhanging core portion 71 laminated core

Claims (16)

[Claims] 1. A rotating magnetic field for a rotor is formed by a fixed armature in which a primary coil and a shading coil are wound around an iron core, wherein the primary coil and the shading of the fixed armature are provided. A toroidal-shading motor, wherein the coil is toroidally wound. 2. The shading coil according to claim 2, wherein the iron core has an annular core surrounding the rotor and a plurality of opposed cores radially protruding from the annular core and facing the rotor. 2. The toroidal winding / shading motor according to claim 1, wherein the windings are distributed and wound so as to be accommodated in at least two or more slots between the opposing core portions adjacent in the circumferential direction. 3. The iron core is composed of two or four divided bodies in a circumferential direction, and the plurality of divided bodies are
3. The toroidal winding motor according to claim 2, wherein the primary coil and the shading coil are integrally joined annularly after being wound around the annular core portion. 4. The method according to claim 1, wherein the primary coil and the shading coil are independently wound for each of the divided bodies and continuously wound from the beginning to the end of the winding in each of the divided bodies. 3. A toroidal winding motor according to item 3. 5. The toroidal winding / shading motor according to claim 2, wherein a core height of the opposed core portion on a facing surface is formed larger than a core height of the annular core portion. 6. The iron core is composed of a laminated core,
6. A partially laminated core portion for enlarging an area facing a rotor is provided on at least the opposed core portion of the iron core so as to be stacked.
A toroidal winding motor as described. 7. The iron core comprises a laminated core,
6. A magnetic flux collecting yoke plate formed by bending at least an outermost layer of the opposed core portion of the iron core so as to increase an area facing the rotor. A toroidal winding motor as described. 8. The core core is made up of an aggregate of magnetic powder, and a magnetic powder expansion core portion for increasing an area facing a rotor is provided at least in the opposed core portion of the iron core in a thick-walled shape. The toroidal winding motor according to claim 5, wherein: 9. The toroidal winding motor according to claim 1, wherein a projecting portion projecting in a radial direction opposite to the opposed core portion is formed in the annular core portion of the iron core. 10. The toroidal winding motor according to claim 1, wherein the fixed armature is a stator of an induction machine. 11. The stator according to claim 1, wherein the fixed armature is a stator of an induction machine, and a core height in a surface facing the rotor and the fixed armature is larger than a core height in a conductive portion of the rotor. The toroidal winding motor according to claim 1, wherein: 12. The toroidal winding motor according to claim 1, wherein the rotating electric machine is a magnet motor having a rotor made of a permanent magnet. 13. The toroidal winding motor according to claim 1, wherein the rotating electric machine is a reluctance motor provided with a rotor made of a reluctance core. 14. The toroidal wound-shading motor according to claim 1, wherein the rotating electric machine is a hysteresis motor provided with a rotor made of hysteresis core. 15. The toroidal winding motor according to claim 1, wherein the rotating electric machine has an inner rotor structure. 16. The toroidal winding motor according to claim 1, wherein the rotating electric machine has an outer rotor structure.