JP2010259309A - Electromagnetic unit and ring coil motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic unit that can be flattened as a whole and is readily assembled, and to provide a ring coil motor made by coupling together a plurality of the electromagnetic units. <P>SOLUTION: The electromagnetic unit includes a stator unit 100A and a rotor unit 200A. The stator unit 100A has a ring-shaped stator core 101, having a stator magnetic yoke 102 and a line of stator magnetic teeth 103, arranged along the circumference of the yoke. The stator unit 100A, further, has a ring-shaped coil 300 disposed coaxial with and close to the stator core 101. The rotor unit 200A has a line of rotor magnetic teeth 202 or a rotor magnetic pole and is disposed coaxial with the stator unit 100A. Each of the teeth of the line of stator magnetic teeth 103 is formed along the direction of axis of the stator magnetic yoke 102, and the line of rotor magnetic teeth 202 or the rotor magnetic pole is disposed opposite to the line of stator magnetic teeth 103. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic unit including a ring coil in a stator unit, and a ring coil motor configured by using a plurality of the electromagnetic units.

Small motors applied to technical fields such as robots and industrial machines are required to facilitate coil winding and mounting, improve coil mounting density, and improve efficiency and torque characteristics.
Here, FIG. 28A and FIG. 28B show examples of the ring coil motor described in Patent Document 1, FIG. 28A shows an outer rotor type, and FIG. 28B shows an inner rotor type step motor.

In FIG. 28A, 1 is a fixed shaft, 2 and 3 are bearings, 4 is a rotor case, 5 is a rotor yoke, 6 and 7 are stator yokes, 8 and 9 are ring coils, and 10 is a magnet plate.
In FIG. 28B, 11 is a rotating shaft, 12 and 13 are bearings, 15 is a rotor yoke, 16 and 17 are stator yokes, 18 and 19 are ring coils, and 20 is a magnet plate.
Teeth are formed on the opposing surfaces of the rotor yokes 5 and 15 and the stator yokes 6, 7, 16, and 17, and permanent magnets are disposed between these teeth.

In the motor, as the rotor rotates, the magnetic flux interlinked with the ring-shaped coils 8, 9, 18 and 19 is changed by the action of the built-in permanent magnet, that is, no load induced voltage is generated in these coils. It is configured as follows. Therefore, a torque is generated in the motor by passing an alternating current through the coil.
In these ring coil motors, it is not necessary to arrange a coil in the slot as in a normal motor, the manufacture of the ring coil is easy, and high torque can be generated by the interaction between the stator and the rotor. It has the characteristics.

Japanese Patent Laid-Open No. 10-23732 (paragraphs [0006] to [0009], FIG. 1, FIG. 8, etc.)

Generally, when it is desired to reduce the size of the entire apparatus by arranging the motor in a narrow space, it is desirable to use a flat motor having a short axial length.
However, the motor shown in FIGS. 28A and 28B assumes a motor in which the radial gap, that is, the gap formed by the opposed surfaces of the stator and the rotor is cylindrical. Since this type of motor tends to be long in the axial direction, it is difficult to form the motor flat. In particular, when three-phase coils are arranged in the axial direction, flattening of the motor is more difficult to realize.

Further, in the inner rotor type motor shown in FIG. 28B, the side portions and the outer peripheral portion of the ring-shaped coils 18 and 19 are surrounded by the stator yokes 16 and 17, so that the coils 18 and 19 have a simple structure. Nevertheless, when the coils 18 and 19 are incorporated in the stator yokes 16 and 17, there is a problem that a complicated assembly work is required.
In order to facilitate this assembling work, a method is conceivable in which the stator yokes 16 and 17 are divided into two portions near the central portion in the axial direction and coupled after sandwiching the coil. In this case, the magnetic path in the stator core is limited. Since it is divided, there is a problem that the magnetic resistance increases, resulting in a decrease in torque.
On the other hand, according to the outer rotor type motor shown in FIG. 28A, since the ring-shaped coils 8 and 9 are arranged around the stator yokes 6 and 7, assembly work is easy. There are not necessarily many product fields to which can be applied.

Therefore, an object of the present invention is to provide an electromagnetic unit that can be flattened as a whole and is easy to assemble.
Another object of the present invention is to provide a thin ring coil motor using a plurality of the electromagnetic units.
Another object of the present invention is to provide an electromagnetic unit and a ring coil motor capable of generating high torque by magnetic interaction between a stator and a rotor.

In order to achieve the above object, an electromagnetic unit according to claim 1 includes a stator unit and a rotor unit.
Here, the stator unit includes a ring-shaped stator core having a ring-shaped stator magnetic yoke and a plurality of stator magnetic teeth arranged regularly along the circumferential direction of the stator magnetic yoke. Furthermore, the stator unit includes a ring-shaped coil that is disposed coaxially and close to the stator core.
The rotor unit has at least one of a rotor magnetic tooth row and a rotor magnetic pole, and is arranged coaxially with the stator unit.
In the present invention, each tooth of the stator magnetic tooth row is formed along the axial direction from the stator magnetic yoke, and the rotor magnetic tooth row or the rotor magnetic pole is arranged to face the stator magnetic tooth row.

  The electromagnetic unit according to a second aspect is the electromagnetic unit according to the first aspect, wherein the opposing surfaces of the rotor magnetic tooth row or the rotor magnetic pole and the stator magnetic tooth row are present inside or outside in the radial direction of the stator magnetic tooth row. It is characterized by that. Specifically, the rotor magnetic tooth row or the rotor magnetic pole is arranged inside or outside in the radial direction of the stator magnetic tooth row.

  An electromagnetic unit according to a third aspect is the electromagnetic unit according to the first aspect, wherein the stator magnetic tooth rows are formed in two concentric circles. A ring-shaped coil is arranged in a gap formed between these two rows of stator magnetic teeth, and a rotor magnetic tooth or rotor magnetic pole is arranged in this gap.

A ring coil motor according to a fourth aspect relates to a motor including three or more electromagnetic units according to the first or second aspect.
Here, the stator units constituting each electromagnetic unit are connected to each other to form one stator, and the rotor units constituting each electromagnetic unit are connected to each other so as to be rotatable about the axis of the stator magnetic yoke. The rotor is formed.
Further, the positional relationship between the stator magnetic tooth row and the rotor magnetic tooth row facing each other in each electromagnetic unit is shifted at equal intervals between the electromagnetic units.

A ring coil motor according to a fifth aspect relates to the electromagnetic unit according to the first or second aspect, wherein the motor includes two electromagnetic units each including a rotor unit having a rotor magnetic pole.
In the present invention as well, similarly to claim 4, the stator units constituting each electromagnetic unit are connected to each other to form one stator, and the rotor unit constituting each electromagnetic unit is centered on the axis of the stator magnetic yoke. The rotors are connected to each other so as to be rotatable.
In addition, the positional relationship between the stator magnetic tooth rows and the rotor magnetic poles facing each other in each electromagnetic unit is characterized by being shifted by approximately 1/4 of the tooth pitch of the stator magnetic tooth row between the electromagnetic units.

  As described in claim 6 or 7, the magnetic material of the members (stator magnetic yoke, stator magnetic tooth row, rotor magnetic yoke, rotor magnetic tooth row, etc.) constituting the stator unit or the rotor unit is easy to process. It is desirable to use a dust core from the viewpoints of increasing the properties, permeability, reducing loss, and the like.

Further, the electromagnetic unit according to claim 8 is the electromagnetic unit according to claim 3, wherein the two rows (inner side and outer side) of the stator magnetic tooth rows have the same number of magnetic teeth, and the rotor magnetic poles are in the rotational direction. A plurality of permanent magnet portions and soft magnetic portions are alternately arranged. The total number of soft magnetic portions is equal to the total number of magnetic teeth of the two rows of stator magnetic tooth rows, and the soft magnetic portions are arranged opposite to the two rows of stator magnetic tooth rows with gaps, and a plurality of permanent magnet portions Are magnetized alternately in opposite directions in the rotation direction.
One end of the soft magnetic portion in the radial direction of the rotor unit is opposed to the magnetic tooth of one (for example, the outer) stator magnetic tooth row, and the other end is in the gap of the other (inner) stator magnetic tooth row. When facing each other, the soft magnetic part adjacent to the soft magnetic part has one end on the same side as the one end facing the gap of one stator magnetic tooth row and the other side on the same side as the other end. The end faces the magnetic tooth of the other stator magnetic tooth row.
That is, when attention is paid to two soft magnetic portions adjacent to each other through the permanent magnet portion, the positional relationship between the end portions of the two rows of stator magnetic teeth facing the magnetic teeth and the gap is reversed. And

Further, an electromagnetic unit according to claim 9 is the electromagnetic unit according to claim 3,
The two rows (inner side and outer side) of the stator magnetic tooth rows each have the same number of magnetic teeth, and the rotor magnetic pole is composed of a permanent magnet portion magnetized in the rotation axis direction and two permanent magnet portions sandwiched in the rotation axis direction. It is comprised by the soft-magnetic part. Each of these two soft magnetic portions has a first row and a second row (inner side and outer side) of magnetic teeth arranged opposite to two rows of stator magnetic teeth via a gap.
The first row (for example, the outer side) magnetic teeth of one soft magnetic portion oppose the magnetic teeth of the one stator magnetic tooth row, and the second row (inner side) magnetic teeth of the other stator magnetic tooth row. When facing the gap, with respect to the other soft magnetic part, the first row magnetic teeth on the same side (outside) as the first row face the gap of one stator magnetic tooth row, and The second row of magnetic teeth on the same side (inner side) as the two rows faces the magnetic teeth of the other stator magnetic tooth row.
That is, focusing on the two soft magnetic portions sandwiching the permanent magnet portion, the positional relationship between the magnetic teeth facing the gaps and the magnetic teeth of the two rows of stator magnetic teeth is reversed.

  A ring coil motor according to a tenth aspect is the ring coil motor according to the fifth or seventh aspect, in which two stator units constituting each electromagnetic unit are integrated.

In addition, as described in claim 11, in the electromagnetic unit according to any one of claims 1, 2, 3, 8, or 9, the stator core is divided into a plurality of divided cores divided along the circumferential direction thereof. You may comprise.
In this case, as described in claim 12, a gap may be provided between adjacent divided cores.

  Furthermore, as described in claim 13, in the electromagnetic unit described in any one of claims 1, 2, 3, 8, 9, 11 or 12, adjacent teeth of the stator magnetic tooth row are connected to each other by a rotor. You may connect with a magnetic body in the position away from the opposing surface.

  According to a fourteenth aspect of the present invention, in the electromagnetic unit according to the eighth aspect, the permanent magnet portion is disposed on the rotor unit so that a surface orthogonal to the magnetization direction of the permanent magnet portion does not intersect the central axis of the rotor unit. You may incline and arrange | position with respect to the radial line which passes along a central axis.

  According to a fifteenth aspect of the present invention, in the electromagnetic unit according to the third aspect, the two rows of stator magnetic tooth rows each have the same number of magnetic teeth, and the rotor unit is formed in an annular shape to form a permanent magnet. A rotor magnetic pole may be provided that includes a soft magnetic portion in which a large number of steel plates each having a hole in which the portion is embedded is laminated in the axial direction, and a permanent magnet portion embedded in the hole.

  As described in claim 16, in the electromagnetic unit according to claim 15, the rotor unit does not have at least one of an inner peripheral portion or an outer peripheral portion of the soft magnetic portion forming a hole in which the permanent magnet portion is embedded. Such a gap may be provided.

According to the present invention, a stator unit comprising a ring-shaped stator core and a ring-shaped coil and a ring-shaped rotor unit having a rotor magnetic tooth row or a rotor magnetic pole are coaxially stacked and arranged, so that the stator magnetic teeth An electromagnetic unit is configured in which the row and the rotor magnetic tooth row or the rotor magnetic pole face each other. Further, a ring coil motor having a ring-shaped coil is configured by connecting a plurality of the electromagnetic units in the axial direction.
Thereby, a flat electromagnetic unit and a ring coil motor having a short axial length can be manufactured by a simple assembly operation. Further, it is possible to generate a large torque by magnetic interaction between the stator magnetic tooth row and the rotor magnetic tooth row or the rotor magnetic pole.
Furthermore, if an electromagnetic unit including a rotor unit composed of a permanent magnet portion and a soft magnetic portion is used, it is not necessary to use a ring-shaped permanent magnet, and the cost can be reduced.

It is a disassembled perspective view of the principal part in 1st Embodiment of this invention. It is a perspective view after the assembly of the principal part in 1st Embodiment of this invention. It is a disassembled perspective view of the principal part in 2nd Embodiment of this invention. It is a perspective view after the assembly of the principal part in 2nd Embodiment of this invention. It is a disassembled perspective view of the principal part in 3rd Embodiment of this invention. It is a perspective view after the assembly of the principal part in 3rd Embodiment of this invention. It is a figure for demonstrating the torque generation principle in 2nd Embodiment of this invention. It is a figure for demonstrating the torque generation principle in 2nd Embodiment of this invention. It is a figure for demonstrating the torque generation principle in 2nd Embodiment of this invention. It is explanatory drawing of the generated torque of the electromagnetic unit shown to FIG. 4A-FIG. 4C. It is a figure for demonstrating the torque generation principle in 4th Embodiment of this invention. It is a figure for demonstrating the torque generation principle in 4th Embodiment of this invention. It is a figure for demonstrating the torque generation principle in 4th Embodiment of this invention. It is explanatory drawing of the generated torque in 4th Embodiment of this invention. It is a disassembled perspective view of the principal part in 5th Embodiment of this invention. It is a perspective view after the assembly of the principal part in 5th Embodiment of this invention. It is a perspective view which shows 6th Embodiment of this invention. It is explanatory drawing of the generated torque and synthetic | combination torque of each electromagnetic unit in 6th Embodiment of this invention. It is a perspective view which shows 7th Embodiment of this invention. It is explanatory drawing of the generated torque and synthetic | combination torque of each electromagnetic unit in 7th Embodiment of this invention. It is a schematic diagram of the powder magnetic core which can be used for each embodiment of the present invention. It is a perspective view of the principal part of the electromagnetic unit in 8th Embodiment of this invention. It is a figure for demonstrating the effect | action of 8th Embodiment. It is a figure for demonstrating the effect | action of 8th Embodiment. It is a figure for demonstrating the effect | action of 8th Embodiment. It is a perspective view of the principal part of the electromagnetic unit in 9th Embodiment of this invention. It is a conceptual diagram which shows the topology deformation | transformation of a rotor unit. It is a block diagram of the principal part of the rotor unit in 10th Embodiment of this invention. It is a perspective view which shows 11th Embodiment of this invention. It is a perspective view of the stator core in 12th Embodiment of this invention. It is a perspective view of the principal part of the stator core in 13th Embodiment of this invention. It is a perspective view which shows the modification of 13th Embodiment. It is a perspective view which shows the modification of 13th Embodiment. It is a top view of the rotor unit in Drawing 14 and Drawing 15A. It is a top view of the rotor unit in 14th Embodiment of this invention. It is a top view of the principal part in FIG. It is a top view of the principal part in FIG. It is a top view of the rotor unit in 15th Embodiment of this invention. It is a top view of the rotor unit in 16th Embodiment of this invention. It is a block diagram of a prior art. It is a block diagram of a prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
1A and 1B show a first embodiment of the present invention relating to an electromagnetic unit. FIG. 1A is an exploded perspective view of a main part, and FIG. 1B is a perspective view of a state where components are assembled.
In FIG. 1A, reference numeral 100A denotes a stator unit, which includes a stator core 101 and a ring-shaped coil 300. The coil is generally formed by winding a conducting wire a plurality of times, but is shown as one ring in the figure. The stator core 101 includes a ring-shaped stator magnetic yoke 102 and a number of stator magnets, each tooth being formed from the stator magnetic yoke 102 along the central axis (z-axis) and arranged at equal intervals in the circumferential direction. And a tooth row 103. Note that the x-axis and y-axis in the figure are the axes in the radial direction of the stator magnetic yoke 102 orthogonal to the z-axis.

Reference numeral 200A denotes a rotor unit, which includes a cylindrical rotor magnetic yoke 201 having a slight length in the z-axis direction, and a large number of rotor magnetic tooth rows 202 arranged along the outer peripheral surface thereof. These rotor magnetic tooth rows 202 protrude in the radial direction (x-axis and y-axis directions) of the rotor unit 200A.
Here, the maximum outer diameters of the stator unit 100A and the rotor unit 200A are formed to have substantially the same length.

FIG. 1B is a perspective view showing a state where the stator unit 100A and the rotor unit 200A are stacked along the z-axis and assembled. In FIG. 1B, a part is omitted for easy viewing.
As shown in FIG. 1B, a ring coil 300 is placed coaxially with the stator magnetic yoke 102 so as to be positioned inside the stator magnetic tooth row 103, and the rotor magnetic yoke 201 of the rotor unit 200A is coaxial. To form the whole.
As a result, the rotor magnetic tooth row 202 and the stator magnetic tooth row 103 face each other in a plane orthogonal to the z axis (a plane on the xy axis).

Next, FIG. 2 shows a second embodiment of the present invention relating to the electromagnetic unit, FIG. 2A is an exploded perspective view of the main part, and FIG. 2B is an overall perspective view of a state in which each component is assembled.
2A, the configuration of the stator unit 100A is the same as that in FIG. 1A. The rotor unit 200B is composed of a rotor magnetic yoke 203 and a rotor magnetic tooth row 204 in substantially the same manner as the rotor unit 200A in FIG. 1A. The maximum outer diameter of the rotor unit 200B is larger than the inner diameter of the stator magnetic tooth row 103. It is getting shorter.

FIG. 2B is a perspective view of the assembled state in which the stator unit 100A and the rotor unit 200B are stacked along the z-axis. Also in FIG. 2B, some parts are omitted for easy viewing.
As shown in FIG. 2B, a ring-shaped coil 300 is placed coaxially with the stator magnetic yoke 102 so as to be positioned inside the stator magnetic tooth row 103, and further, the rotor unit 200B is placed coaxially. Is formed. In this embodiment, since the maximum outer diameter of the rotor unit 200B is shorter than the inner diameter of the stator magnetic tooth row 103, the rotor unit 200B is accommodated inside the stator magnetic tooth row 103. As a result, the inner peripheral surface of the stator magnetic tooth row 103 and the outer peripheral surface of the rotor magnetic tooth row 204 (both surfaces are parallel to the z axis) face each other.

3A and 3B show a third embodiment of the present invention relating to an electromagnetic unit, in which FIG. 3A is an exploded perspective view of a main part, and FIG. 3B is a perspective view of a state in which respective components are assembled.
3A, the configuration of the stator unit 100A is the same as that in FIGS. 1A and 2A. The rotor unit 200C is composed of a ring-shaped rotor magnetic yoke 205 and a large number of rotor magnetic tooth rows 206 arranged on the outer peripheral surface thereof. The inner diameter of the rotor magnetic tooth row 206 is the outer diameter of the stator magnetic tooth row 103. Longer than.

FIG. 3B is a perspective view of a state in which the stator unit 100A and the rotor unit 200C are stacked along the z axis and assembled. Also in FIG. 3B, a part of the drawing is omitted for easy viewing.
As shown in FIG. 3B, a ring-shaped coil 300 is placed coaxially with the stator magnetic yoke 102 so as to be positioned inside the stator magnetic tooth row 103, and further, the stator magnetic tooth row 103 is replaced with the rotor magnetic tooth row 206. The rotor unit 200 </ b> C is placed on the same axis so as to surround it, thereby forming the whole. In this embodiment, since the inner diameter of the rotor magnetic tooth row 206 is longer than the outer diameter of the stator magnetic tooth row 103, the stator unit 100A is accommodated inside the rotor magnetic tooth row 206. As a result, the outer peripheral surface of the stator magnetic tooth row 103 and the inner peripheral surface of the rotor magnetic tooth row 206 are opposed to each other (both surfaces are parallel to the z axis).

Each of the above embodiments is for the case where the rotor units 200A, 200B, and 200C have the rotor magnetic tooth rows 202, 204, and 206. However, the electromagnetic units according to the present invention are such that the rotor units 200A, 200B, and 200C are the rotors. This includes the case of having a magnetic pole.
Here, the rotor magnetic dentition means a structure in which convex and concave portions of a magnetic material such as iron are regularly arranged in the circumferential direction, and the rotor magnetic pole is an N pole formed by a magnet, S The poles are regularly arranged in the circumferential direction. The stator magnetic tooth row refers to a structure in which convex and concave portions of a magnetic material are regularly arranged in the circumferential direction, like the rotor magnetic tooth row.

Here, the principle of torque generation in these electromagnetic units will be described. 4A to 4C are views for explaining the principle of torque generation. In these drawings, the electromagnetic unit of the second embodiment shown in FIGS. 2A and 2B is illustrated.
In the electromagnetic unit of the second embodiment, the stator magnetic tooth rows 103 are arranged at equal intervals along the circumferential direction of the stator magnetic yoke 102. Inside the stator magnetic tooth row 103, a rotor magnetic tooth row 204 is disposed to face the stator magnetic tooth row 103. The ring-shaped coil 300 includes a stator magnetic tooth row 103 and a stator magnetic yoke along the stator magnetic tooth row 103 as shown in the AA cross-sectional view of FIG. 4A and the A′-A ′ cross-sectional view of FIG. 4B. 102, the rotor magnetic tooth row 204 and the rotor magnetic yoke 203 are disposed in a space. Here, the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 have the same number of teeth.
Note that the number of turns of the ring-shaped coil 300 is not limited on the principle of torque generation, and may be appropriately determined according to the voltage of the power source applied to the coil 300.

  FIG. 4A shows a state in which the positions of the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 are aligned. As shown in the AA sectional view, in this state, the magnetic body including the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 surrounds the current flow direction of the ring-shaped coil 300, A magnetic path a generated by 300 current is formed. This state is the most magnetically stable state (low magnetic energy state) as the position of the rotor, and no torque is generated even when a current is passed through the coil 300.

FIG. 4B shows a state in which the positions of the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 are completely displaced. In this state, as shown in the A′-A ′ cross-sectional view, there is a large space in the magnetic path a surrounding the current flow direction of the ring-shaped coil 300, and the magnetic resistance of the magnetic path a as compared with FIG. 4A. Becomes larger, and the magnetic flux generated by the current becomes smaller than that in FIG. 4A.
This state is the most magnetically unstable state (high magnetic energy state) as the position of the rotor, and no torque is theoretically generated even when a current is passed through the coil 300. In practice, however, the rotor position slightly shifts to generate torque in such a direction that the magnetic energy is reduced and magnetically stabilized.

  If the pitch between adjacent teeth of the stator magnetic tooth row 103 is, for example, 1 pitch, FIG. 4C shows a state in which the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 are shifted by (1/4) pitch. In this state, a magnetic flux is generated by passing a current through the coil 300, and a torque is generated in the direction of the arrow b so that the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 are aligned. In other words, since the state in which both tooth rows 103 and 204 are aligned is the most magnetically stable state (low magnetic energy state), a torque is generated to reach that state.

Next, FIG. 5 is a diagram for explaining the generated torque of the electromagnetic unit shown in FIGS. 4A to 4C.
Misalignment angle θ between stator magnetic tooth row 103 and rotor magnetic tooth row 204 when the current flowing through coil 300 is constant (the state in which the positions of stator magnetic tooth row 103 and rotor magnetic tooth row 204 are aligned θ = The change in torque due to 0 ° and one tooth pitch of 360 ° is roughly as shown in FIG. In FIG. 5, the change in torque is simply shown as a sine wave. However, in practice, the change in torque with respect to θ is not necessarily a sine wave, and is generally a distorted waveform including harmonics. In FIG. 5, the positional relationship between the stator magnetic tooth row 103 and the rotor magnetic tooth row 204 is shown schematically.
When both the stator side and the rotor side have only magnetic tooth rows, the torque-θ characteristics are the same even if the polarity of the current is changed.

6A to 6C show the principle of torque generation in the electromagnetic unit according to the fourth embodiment of the present invention. In the fourth embodiment, the rotor unit has not the rotor magnetic tooth row but the rotor magnetic pole (the structure in which the N pole and the S pole formed by magnets are regularly arranged in the circumferential direction as described above). Is.
The configuration of the stator unit 100A is the same as that of the second embodiment (FIGS. 2A, 2B, and 4A to 4C).

The configuration of the rotor unit corresponds to that obtained by replacing the rotor magnetic tooth row 204 of the rotor unit 200B in the second embodiment with a rotor magnetic pole, and as shown in FIGS. 6A to 6C, the inner side of the ring-shaped stator core 101 The rotor unit 200D is arranged concentrically. The rotor unit 200D includes a ring-shaped rotor magnetic yoke 203 and a large number of rotor magnetic poles 207 arranged along the circumferential direction of the yoke 203.
The outer peripheral surface of the rotor magnetic pole 207 is opposed to the inner peripheral surface of the stator magnetic tooth row 103. Further, as shown in FIGS. 6A to 6C, a ring coil 300 is provided in a space between the stator magnetic tooth row 103, the stator magnetic yoke 102, the rotor magnetic pole 207, and the rotor magnetic yoke 203 along the stator magnetic tooth row 103. Is arranged. Here, the number of pairs of N magnetic poles and S magnetic poles (rotor magnetic pole pairs) of the stator magnetic tooth row 103 and the rotor magnetic pole 207 is equal.
There are various conceivable methods of configuring the rotor magnetic pole 207 in this embodiment, but the simplest is a structure in which permanent magnets corresponding to the N pole and the S pole are arranged.

  FIG. 6A shows a state where the N magnetic pole positions of the stator magnetic tooth row 103 and the rotor magnetic pole 207 are aligned. In this case, both the magnetic flux generated by the rotor magnetic pole 207 and the magnetic flux generated by the current of the coil 300 are generated in the direction of the magnetic path a shown in the BB cross-sectional view. This state is the most magnetically stable state with respect to the position and current polarity of the rotor unit 200D, and no torque is generated. When the current polarity is reversed, the polarity of the magnetic flux generated by the rotor magnetic pole 207 and the magnetic flux generated by the current of the coil 300 are opposite to each other, and the magnetically unstable state is obtained.

  FIG. 6B shows a state where the positions of the south poles of the stator magnetic tooth row 103 and the rotor magnetic pole 207 are aligned. In this case, if the current polarity is the same as in FIG. 6A, the polarity of the magnetic flux generated by the rotor magnetic pole 207 and the magnetic flux generated by the current of the coil 300 conflict with each other. Does not occur. However, in actuality, torque is generated so as to be in the state of FIG. 6A when the position of the rotor is slightly shifted.

FIG. 6C shows a state in which the stator magnetic tooth row 103 and the boundary between the north pole and south pole of the rotor magnetic pole 207 are opposed to each other. When the current having the polarity shown in FIG. 6A is passed through the coil 300 in this state, torque is generated in the direction in which the stator magnetic tooth row 103 and the N pole of the rotor magnetic pole 207 are aligned (arrow b direction in FIG. 6C). Conversely, when a current having the opposite polarity to that of FIG. 6A is passed through the coil 300, torque is generated in the direction in which the stator magnetic tooth row 103 and the S pole of the rotor magnetic pole 207 are aligned (the direction of arrow c in FIG. 6C).
Thus, when the rotor magnetic pole 207 exists, the point that the direction of the generated torque changes depending on the polarity of the current flowing through the coil 300 is different from the case where the rotor magnetic tooth row 204 is provided as in the second embodiment. Different. When the rotor unit includes both the rotor magnetic pole 207 and the rotor magnetic tooth row 204, a torque characteristic combining both characteristics appears.

FIG. 7 is a diagram for explaining the torque generated by the electromagnetic unit shown in FIGS. 6A to 6C.
The misalignment angle θ between the stator magnetic tooth row 103 and the rotor magnetic pole 207 when the current flowing through the coil 300 is constant (the state where the positions of the N poles of the stator magnetic tooth row 103 and the rotor magnetic pole are aligned is θ = 0 °. The change in torque due to a tooth pitch of 360 ° is roughly as shown in FIG. As in the case of FIG. 5, the change in torque with respect to θ is not necessarily a sine wave, but generally has a distorted waveform including harmonics. In FIG. 7, the positional relationship between the stator magnetic tooth row 103 and the rotor magnetic pole 207 is shown schematically.
According to this embodiment, the polarity of the torque is reversed by reversing the polarity of the current flowing through the coil 300.

  As described above, according to the above-described embodiments, in the electromagnetic unit including the ring-shaped coil 300, torque according to the current and the position of the rotor magnetic tooth row or the rotor magnetic pole can be generated. However, the generated torque of one electromagnetic unit composed of one stator unit and one rotor unit is a pulsating torque, and cannot be generated continuously and in one direction. Therefore, in order to generate torque continuously and in one direction to function as a motor, it is necessary to use a combination of a plurality of the electromagnetic units as will be described later.

If the electromagnetic unit is configured as shown in the first to fourth embodiments, the motor using the electromagnetic unit can be flattened and thinned as a whole. Further, since the ring-shaped coil 300 may be fitted inside the stator magnetic yoke 102, the assembly of the stator unit 100A is extremely easy. Furthermore, since the rotor units 200A to 200D and the stator unit 100A may be fitted in the z-axis direction, the assembly of the electromagnetic unit is also good.
Although the support mechanisms for the rotor units 200A to 200D and the stator unit 100A are not shown, the positions of the z-axis direction, the x-axis, and the y-axis direction (radial direction) are maintained, and relatively supported by a known mechanism. What is necessary is just to hold | maintain so that rotation is possible.
Further, the number of stator magnetic tooth rows and the number of rotor magnetic tooth rows or rotor magnetic pole pairs are not necessarily equal. This is because, as described above, torque is generated when the magnetic energy changes according to the rotation of the rotor.
Further, both the stator core and the rotor unit can be divided in the circumferential direction. That is, since the structure has periodicity in the circumferential direction, the stator core and the rotor unit shown in FIGS. 1A to 3B and the like can be obtained by arranging the cores and magnetic poles having the same shape at intervals of 120 ° and 90 °, for example. Can be configured. Their bonding may be by adhesion or by a support structure not shown. The electromagnetic unit or motor according to the present invention is characterized in that the magnetic flux mainly flows so as to surround the ring coil and hardly flows in the circumferential direction, so that the influence of the above-described division of the core is small.

  In general, the cylindrical surface is easier to improve than the flat surface from the viewpoint of processing. Therefore, as in the second to fourth embodiments, compared to the case where the opposing surface of the stator magnetic tooth row and the rotor magnetic tooth row or the rotor magnetic pole is a surface orthogonal to the z axis as in the first embodiment, The opposing surfaces of the stator magnetic tooth row and the rotor magnetic tooth row or the rotor magnetic pole are preferably formed on the inner side or the outer side along the radial direction of the stator magnetic tooth row. As a result, the distance between the opposing surfaces can be shortened, and the magnetic resistance viewed from the coil 300 can be reduced, so that the generated magnetic flux increases and the torque is easily increased.

8A and 8B show a fifth embodiment of the present invention relating to an electromagnetic unit, in which FIG. 8A is an exploded perspective view of the main part, and FIG. 8B is a perspective view of a state in which the components are assembled. In FIG. 8B, part of the illustration is omitted for the sake of clarity.
In FIG. 8A, reference numeral 100B denotes a stator unit, which includes a stator core 104 and a ring-shaped coil 300. The stator core 104 includes a ring-shaped stator magnetic yoke 105, first stator magnetic tooth rows 106 arranged at equal intervals along the circumferential direction on an end surface (a surface orthogonal to the z-axis) of the yoke 105, and The second stator magnetic tooth row 107 is arranged at equal intervals along the circumferential direction with a predetermined gap inside.

Reference numeral 200E denotes a rotor unit, which is composed of a ring-shaped rotor magnetic yoke 208 and rotor magnetic tooth rows 209 arranged on the end surface (a surface perpendicular to the z-axis) at equal intervals along the circumferential direction. Has been. As shown in FIG. 8B, the rotor magnetic tooth row 209 can be accommodated in a gap between the first stator magnetic tooth row 106 and the second stator magnetic tooth row 107 on the stator core 104 side. That is, in this embodiment, the rotor magnetic tooth row 209 is arranged so as to be sandwiched between two rows of stator magnetic tooth rows 106 and 107 arranged concentrically. Here, although not shown, the rotor unit may include a rotor magnetic pole instead of the rotor magnetic tooth row 209, and the rotor magnetic pole may be disposed so as to be sandwiched between the two rows of stator magnetic tooth rows 106 and 107.
According to the present embodiment, torque can be generated for each of the rotor magnetic tooth rows 209 or the two rows of stator magnetic tooth rows 106 and 107 facing the rotor magnetic poles, so that the torque can be further increased. .

  Next, FIG. 9 is a perspective view showing a sixth embodiment of the present invention relating to a ring coil motor. In this embodiment, the rotor unit has only a rotor magnetic tooth row, for example, three electromagnetic units 401 according to the second embodiment (FIGS. 2A and 2B) are connected in the z-axis direction, and a ring coil motor is connected. It is composed. Note that four or more electromagnetic units 401 may be connected as described below.

As described above, since the electromagnetic unit generates pulsating torque, it is necessary to connect a plurality of electromagnetic units in order to obtain torque continuously. Here, considering the number of electromagnetic units to be connected, when the rotor unit has only the rotor magnetic tooth row and does not have the rotor magnetic pole, the generated torque does not change even if the current polarity is reversed as described above. Therefore, in principle, it is necessary to configure a motor using three or more electromagnetic units.
Although not shown in FIG. 9, the three rotor units and the three stator units are mechanically connected to form one rotor and a stator, respectively. Is held rotatably.

In addition, the relative positional relationship of the magnetic tooth row (the relative positional relationship between the rotor magnetic tooth row and the stator magnetic tooth row) for the pair of the rotor unit and the stator unit facing each other is between the three electromagnetic units 401. (1/3) tooth pitch deviation from each other, the reason will be described later. Here, said tooth pitch means the space | interval of the adjacent teeth of a stator magnetic tooth row | line | column.
In FIG. 9, a reference line d parallel to the z-axis is displayed in order to show the positional relationship based on one electromagnetic unit 401.
In FIG. 9, the position of the stator magnetic tooth row 103 is shifted with respect to the reference line d between the three electromagnetic units 401, and the rotor magnetic tooth row is aligned. However, since the relative positional relationship between the rotor magnetic tooth row and the stator magnetic tooth row may be shifted as described above, for example, the position of the stator magnetic tooth row is aligned between the three electromagnetic units 401, and the rotor The position of the magnetic dentition may be shifted.

FIG. 10 is a diagram for explaining the generated torque and the combined torque of each electromagnetic unit in the sixth embodiment shown in FIG.
10A shows the torque-θ characteristics in the first electromagnetic unit 401 when the current is constant, which is the same as that shown in FIG. Here, when the current (intermittent waveform) shown in FIG. 10B is passed through the coil 300 in accordance with the misalignment angle θ, the torque shown in FIG. 10C is applied to the first electromagnetic unit. Occurs at 401. This is because if a current is passed during a period in which the torque is negative in FIG. 10A, a torque in a direction opposite to the direction of the torque to be obtained continuously is generated regardless of the current polarity as described above. This is because the current is not passed.

  The three electromagnetic units 401 shown in FIG. 9 are arranged such that the stator magnetic tooth row and the rotor magnetic tooth row are shifted by a positional shift angle θ = 120 °, respectively. Since there are three electromagnetic units 401, 360 ° / 3 = 120 ° is set so that the torque characteristic that becomes one cycle at θ = 360 ° is evenly distributed. In this way, the arrangement of the electromagnetic units 401 (the misalignment angle θ between the electromagnetic units 401) may be set according to the number of electromagnetic units 401 constituting the motor.

FIG. 10D shows the torques of the three electromagnetic units 401 and their combined torque. As described above, the rotor unit and the stator unit of the three electromagnetic units 401 are mechanically connected to form the rotor and the stator, and the motor is constituted by the whole, so that the torque generated in the rotor is three. The total torque value of the electromagnetic unit 401. This is shown by the combined torque in FIG.
The combined torque shown in FIG. 10 (d) has a waveform in which a pulsating component is superimposed on a constant torque, and it can be seen that continuous torque generation is possible. This is the principle of torque generation of the ring coil motor according to the present invention.

It is often desirable to remove the pulsation component superimposed on the combined torque. As a method for removing this pulsation component, the pulsation component of the torque can be minimized by adjusting the waveform of the current flowing through the coil 300. In addition, since the current flow to the coil 300 is normally performed using a power converter such as an inverter, the degree of freedom of waveform adjustment is generally high.
The above description relates to the invention according to claim 4 when the rotor unit does not have the rotor magnetic pole. However, the present invention is also applicable when the rotor unit has a rotor magnetic pole. That is, three or more electromagnetic units are used, the positions between the electromagnetic units are determined so that the no-load induced electromotive force in each electromagnetic unit has an equal interval phase difference, and the number of phases according to the number of the electromagnetic units (for example, In the case of three electromagnetic units, a three-phase current can be passed through each coil so that it can function as a motor.
Therefore, the invention according to claim 4 includes a ring coil motor that includes a rotor unit having a rotor magnetic pole, and in which the electromagnetic unit has no-load induced electromotive force.

FIG. 11 is a perspective view showing a seventh embodiment of the present invention relating to a ring coil motor.
In this embodiment, the rotor unit has a rotor magnetic pole 210, and two electromagnetic units 402 composed of the rotor unit and the stator unit are connected back to back in the z-axis direction to constitute a flat motor. .
In each rotor unit, N-pole and S-pole rotor magnetic poles 210 are alternately arranged in the circumferential direction, and the outer peripheral surface of these rotor magnetic poles 210 faces the inner peripheral surface of the stator magnetic tooth row 103.

  In FIG. 11, two electromagnetic units 402 having substantially the same structure as the electromagnetic units shown in FIGS. 6A to 6C are connected back to back along the z axis so that the stator magnetic yokes 102 are back to back. Although not appearing in FIG. 11, the two rotor units and the two stator units constituting each electromagnetic unit 402 are mechanically connected to each other and are relatively rotatably held by a known mechanism. .

The relative positional relationship (the relative positional relationship between the rotor magnetic pole and the stator magnetic tooth row) of the pair of the rotor unit and the stator unit facing each other is (1/4) tooth pitch between the two electromagnetic units 402. The reason for this will be described later. In FIG. 11, e is a reference line for indicating the relative positional relationship between the rotor magnetic pole 210 and the stator magnetic tooth row 103 between the two electromagnetic units 402.
In FIG. 11, the position of the stator magnetic tooth row 103 is shifted between the two electromagnetic units 402 with respect to the reference line e, and the rotor magnetic poles 210 are aligned. However, since the relative positional relationship between the rotor magnetic pole and the stator magnetic tooth row only needs to be deviated as described above, for example, the position of the stator magnetic tooth row is aligned between the two electromagnetic units 402, and the rotor magnetic pole The position may be shifted.

Next, FIG. 12 is a diagram for explaining the generated torque and the combined torque of each electromagnetic unit 402 in the seventh embodiment shown in FIG.
12A shows the torque-θ characteristics in the first electromagnetic unit 402 when the current is constant, which is the same as that shown in FIG. Here, when the current shown in FIG. 12B is passed through the coil 300 in accordance with the misalignment angle θ, torque as shown in FIG. 12C is generated in the first electromagnetic unit 402. Unlike the case of FIG. 10, an alternating current is given as the current, and as a result, a pulsating torque biased on the positive side as shown in FIG. 12C is obtained. In FIG. 12A, torque can be generated in a desired direction by reversing the current polarity during a period in which the torque is negative.
When the number of electromagnetic units 402 is two, the positional relationship between the stator magnetic tooth row and the rotor magnetic pole is arranged so that the misalignment angle θ = 90 °. The torque generated by the two electromagnetic units 402 is as shown in FIG. 12D, and the sum of these is the combined torque of the motor.

FIG. 12 shows a case where both the torque-θ characteristic of (a) and the circulated current waveform of (b) are sine waves. In this case, as shown in FIG. It becomes almost constant. This is because the pulsating torques generated by the two electromagnetic units 402 cancel each other, which is one ideal state.
Actually, the torque-θ characteristic often includes harmonics. In this case, when a sinusoidal current is passed through the coil 300, a pulsating torque corresponding to the harmonics is superimposed. In order to obtain a constant torque, it is effective to reduce the harmonics in the torque-θ characteristics as much as possible by the magnetic design of the motor, and to make a current waveform that cancels the pulsating torque due to the harmonics. As described with reference to FIG. 10, the adjustment of the current waveform flowing through the coil 300 can be realized with a high degree of freedom by the inverter.

FIG. 13 is a schematic view of a dust core suitable for the magnetic material of the stator unit or the rotor unit in each of the above embodiments.
When realizing the present invention, it is obviously difficult to use a normal laminated steel sheet as the magnetic material of the stator unit or the rotor unit. Laminated steel plates are often used as iron core materials for electrical equipment. Basically, they are constructed by stacking the same shape of plates, so it can be said that they are materials for equipment having a uniform cross-sectional shape. Therefore, in order to realize an electromagnetic unit having a stator unit or the like having a non-uniform cross-sectional shape, it is necessary to use a material other than the laminated rope.

The above problem can be solved by using a dust core. As shown in FIG. 13, the dust core is used by curing a magnetic powder (for example, iron powder) 501 having a diameter of about several tens to several hundreds of μm coated with an insulator 502. Specifically, a mold having a desired shape may be prepared, and a dust core may be injected into the mold, molded, and cured.
Thus, by using the magnetic powder 501 as the magnetic material, the magnetic permeability can be increased, and the coating using the insulator 502 can suppress the eddy current accompanying the magnetic flux change and reduce the loss.
As described above, since the degree of freedom of shape is improved if a dust core is used, it is suitable as a magnetic material constituting the electromagnetic unit and the ring coil motor according to the present invention.

Next, FIG. 14 is a perspective view of the main part of the electromagnetic unit according to the eighth embodiment of the present invention. In addition, this figure shows a part along the rotation direction (circumferential direction) of the electromagnetic unit, and the same structure as FIG. 14 is periodically formed over the entire circumference of the electromagnetic unit.
As a configuration method of the rotor magnetic pole, as shown in FIG. 11, it is conceivable to use a ring-shaped permanent magnet and alternately magnetize the N pole and the S pole along the circumferential direction. As another method, two large and small ring-shaped permanent magnets can be attached to the inner peripheral portion and the outer peripheral portion of the ring-shaped magnetic yoke.
However, in general, since a ring-shaped permanent magnet is expensive, it is desired to provide a rotor magnetic pole that is less expensive and performs the same function, and the eighth embodiment of the present invention meets this problem.

14, 100F is a stator unit, 120 is a magnetic tooth constituting the outer stator magnetic tooth row, 130 is a magnetic tooth constituting the inner stator magnetic tooth row, and the total number of outer magnetic teeth 120 and the inner side are shown. The total number of magnetic teeth 130 is equal. Reference numeral 125 denotes a gap between the outer stator magnetic teeth rows, and 135 denotes a gap between the inner stator magnetic teeth rows.
Reference numeral 200F denotes a ring-shaped rotor unit, which is disposed between the inner and outer two rows of stator magnetic tooth rows described above with a slight gap. The rotor unit 200F is configured by alternately arranging permanent magnet portions 221 made of a neodymium magnet or the like and soft magnetic portions 222 made of an iron-based alloy or the like in the rotation direction. The total number of permanent magnet portions 221 is equal to the total number of magnetic teeth 120 and 130, and the total number of soft magnetic portions 222 is also equal to the total number of magnetic teeth 120 and 130.
The permanent magnet portion 221 and the soft magnetic portion 222 constitute a rotor magnetic pole.
Similarly to the above, reference numeral 105 denotes a stator magnetic yoke, and 300 denotes a ring coil.

15A to 15C are diagrams for explaining the operation of the eighth embodiment.
First, FIG. 15A shows a part of the rotor unit 200F, and the permanent magnet portions 221a, 221b, 221c,... Are alternately reversed along the rotation direction of the rotor unit 200F as indicated by the symbol ▲. Is magnetized. For this reason, the soft magnetic parts 222a, 222b, 222c,... Sandwiched between the two permanent magnet parts form S poles, N poles, S poles,.

15B shows the permanent magnet portions 221a, 221b, and 221c and soft magnetic portions 222a, 222b, 222c, and 222d on the rotor unit 200F side, and magnetic teeth 120a and 120b on the outside of the stator unit 100F (corresponding to the magnetic teeth 120 in FIG. 14). ) And the inner magnetic teeth 130a and 130b (also corresponding to the magnetic teeth 130). Reference numerals 120X and 130X denote outer and inner stator magnetic tooth rows, respectively.
In FIG. 15B (the same applies to FIGS. 15A and 15C), for convenience, the permanent magnet portions 221a, 221b, and 221c, the soft magnetic portions 222a, 222b, 222c, and 222d, and the stator magnetic tooth rows 120X and 130X are in a straight line. Although these are illustrated as being arranged, these are actually arranged on concentric circles around the rotation axis, as is apparent from FIG.

  As shown in FIG. 15B, for example, when one end surface of the soft magnetic part 222a along the radial direction of the rotor unit 200F is opposed to the magnetic tooth 120a of the outer stator magnetic tooth row 120X, The end face faces the gap 135 of the inner stator magnetic tooth row 130X, and at this time, one end face of the adjacent soft magnetic portion 222b faces the gap 125 of the outer stator magnetic tooth row 120X, and the other soft magnetic portion 222b. The end face faces the magnetic teeth 130a of the inner stator magnetic tooth row 130X. Such a positional relationship is repeated in the rotation direction of the rotor unit 200F.

  In the state of FIG. 15B, the magnetic flux generated by the permanent magnet portions 221a and 221b is as follows: the soft magnetic portion 222b → the magnetic teeth 130a → the stator magnetic yoke 105 (not shown in FIG. 15B) → the magnetic teeth 120a and 120b → the soft magnetic portion 222a. , 222c → permanent magnet portions 221a, 221b → soft magnetic portion 222b, the route h is linked to the ring coil 300 of FIG.

From this state, when the rotor unit 200F rotates upward in the drawing by a half of the tooth pitch of the stator magnetic tooth rows 120X and 130X, the positional relationship shown in FIG. 15C is obtained.
That is, the magnetic fluxes generated by the permanent magnet portions 221b and 221c are the soft magnetic portions 222b and 222d → the magnetic teeth 120a and 120b → the stator magnetic yoke 105 → the magnetic teeth 130a → the soft magnetic portion 222c → the permanent magnet portions 221b and 221c → the soft magnetic portion 222b. , 222d through the path h ′ (the path opposite to the path h in FIG. 15B), the path h ′ is linked to the ring coil 300.

As is apparent from the above description, the linkage magnetic flux of the ring-shaped coil 300 caused by the permanent magnet portion is alternated by the rotation of the rotor unit 200F, and has already been described with reference to FIGS. 6A to 6C, FIG. As described above, when an appropriate current is passed through the ring coil 300, torque as a motor is generated.
According to the present embodiment, an expensive ring-shaped permanent magnet consisting only of the permanent magnet portion is not required, and the permanent magnet portion and the soft magnetic portion are alternately arranged to have the same shape as the ring-shaped permanent magnet. Thus, a rotor unit that performs the same function can be formed. For this reason, the manufacturing cost of an electromagnetic unit or a ring coil motor can be reduced.

  Further, since the magnetic flux of the permanent magnet portion is used without waste due to the interaction with the soft magnetic portion, the configuration is advantageous from the viewpoint of increasing the torque density. That is, when a magnetic pole is formed using a ring-shaped permanent magnet, the magnetic pole facing the gap of the stator magnetic tooth row not only contributes to torque generation, but also faces the magnetic tooth of the stator magnetic tooth row. This causes the magnetic flux of the adjacent magnetic pole to leak and rather reduces the torque. However, according to the present embodiment, as apparent from FIGS. 15A to 15C, the magnetic flux of the permanent magnet portion is collected by the soft magnetic portion and guided to the stator magnetic tooth row, and such a problem arises. There is nothing.

In the eighth embodiment described above, since the number of permanent magnet portions and soft magnetic portions is large, the assembly work of the rotor unit may be complicated, and there is a problem of further simplifying the structure of the rotor unit.
The ninth embodiment shown in FIG. 16 solves the above problems. That is, in FIG. 16, the rotor unit 200G includes a ring-shaped permanent magnet portion 223 magnetized in the rotation axis direction, and a ring-shaped soft magnet disposed so as to sandwich the permanent magnet portion 223 from both sides in the rotation axis direction. Parts 224 and 225. The soft magnetic portions 224 and 225 are respectively provided with two rows of magnetic teeth 224A, 224B, 225A, and 225B protruding outward and inward in the radial direction.
Here, the magnetic teeth 224A of the soft magnetic portion 224 correspond to the first row of magnetic teeth and the magnetic teeth 224B correspond to the second row of magnetic teeth, respectively. Similarly, the magnetic teeth 225A of the soft magnetic portion 225 In the ninth aspect, the first row of magnetic teeth and the magnetic teeth 225B correspond to the second row of magnetic teeth, respectively.

Further, 100G is a stator unit, 140 is a magnetic tooth constituting the outer stator magnetic tooth row, and 150 is a magnetic tooth constituting the inner stator magnetic tooth row. These magnetic teeth 140 and 150, and the rotor unit 200G The total number of each of the magnetic teeth 224A, 224B, 225A, 225B is equal. Reference numeral 145 denotes an outer stator magnetic tooth gap, and reference numeral 155 denotes an inner stator magnetic tooth gap.
As in FIG. 14, the structure shown in FIG. 16 is periodically formed over the entire circumference of the electromagnetic unit.
In the above-described configuration, instead of using the ring-shaped permanent magnet portion 223, a plurality of fan-shaped permanent magnets may be connected in the rotation direction, or a large number of rectangular permanent magnets may be connected to form a ring shape as a whole. It may be formed.

  The magnetic teeth 224A and 224B of one soft magnetic portion 224 and the magnetic teeth 225A and 225B of the other soft magnetic portion 225 are arranged with a (½) pitch deviation. Thereby, for example, the outer magnetic teeth 224A of one soft magnetic portion 224 are opposed to the outer magnetic teeth 140 of the stator unit 100G (at this time, the inner magnetic teeth 224B are the gaps 155 inside the stator unit 100G). ) Of the other soft magnetic part 225 is opposed to the outer gap 145, and the magnetic tooth 225 B of the soft magnetic part 225 is opposed to the inner magnetic tooth 150. .

The structure shown in FIG. 16 is advantageous in that the number of permanent magnet portions 223 and soft magnetic portions 224 and 225 is small, and assembly work and component management of the rotor unit 200G are facilitated. The principle of torque generation is basically the same as in the eighth embodiment.
That is, the rotor unit 200G in FIG. 16 maintains the principle of torque generation by the interaction between the permanent magnet portion 221 and the soft magnetic portion 222 of the rotor unit 200F in FIG. 14 while reducing the number of permanent magnet portions. It can also be understood as a topological modification of the unit structure.

FIG. 17 is a conceptual diagram showing the above-described topology deformation, and shows a deformation process from the rotor unit 200F in FIG. 14 to the rotor unit 200G in FIG.
In the uppermost stage of FIG. 17, the magnetization state of the soft magnetic part 222 is equal every other direction along the rotation direction of the rotor unit 200F. Therefore, even when these are coupled, the magnetic flux generated by the permanent magnet part 221 is transferred to the stator unit. Can be maintained.
If this principle is used, the rotor unit 200F shown in the uppermost stage in FIG. 17 can be gradually deformed as shown in the figure, and finally simplified as the rotor unit 200G shown in the lowermost stage in FIG. 17 schematically shows a state in which only the rotor unit 200G in FIG. 16 is viewed from one point in the radial direction, and 224C in FIG. 17 is a magnetic tooth of the soft magnetic portion 224 ( 16 shows a magnetic tooth 224A or 224B), and 225C in FIG. 17 shows a magnetic tooth of the soft magnetic part 225 (magnetic tooth 225A or 225B in FIG. 16).

Next, FIG. 18 is a configuration diagram of the main part of the rotor unit 200H in the tenth embodiment, where (a) is a front view, (b) is a side view, and (c) is a plan view.
In this embodiment, the magnetic teeth 224C and 225C of the rotor unit 200G shown at the bottom of FIG. 17 are expanded to the permanent magnet portion 223 side to form magnetic teeth 224D and 225D, respectively. In this case, since the N poles and S poles of the magnetic teeth 224D and 225D exist alternately in the rotation direction, the area can be increased without interfering with each other.
In FIG. 18, the soft magnetic part 224 and its magnetic teeth 224 </ b> D are represented by a one-dot chain line, and the soft magnetic part 225 and its magnetic teeth 225 </ b> D and the permanent magnet part 223 are represented by a solid line. Here, the magnetic teeth 224 </ b> D and 225 </ b> D may have sufficient intervals between the soft magnetic parts 225 and 224 having different polarities so that the magnetic flux from the permanent magnet part 223 does not leak between the poles. is necessary.

By increasing the areas of the magnetic teeth 224D and 225D in this way, the magnetic resistance of the magnetic flux generated from the permanent magnet portion 223 can be reduced, so that the number of interlinkage magnetic fluxes of the ring-shaped coil 300 increases, and torque Can be further increased.
Incidentally, the path of the magnetic flux by the configuration of FIG. 18 is as follows: permanent magnet portion 223 → soft magnetic portion 224 → magnetic teeth of the outer stator magnetic tooth row (magnetic teeth 140 of FIG. 16) → stator magnetic yoke 105 → inner stator magnetic teeth. The magnetic teeth in the row (magnetic teeth 150 in FIG. 16) → soft magnetic portion 225 → permanent magnet portion 223.

  As described above, according to the ninth embodiment in FIG. 16 and the tenth embodiment in FIG. 18, the number of components of the rotor unit is significantly reduced as compared with the eighth embodiment in FIG. The same effects as the embodiment can be obtained, and the manufacturing cost can be reduced.

Next, FIG. 19 is a perspective view showing an eleventh embodiment of the present invention. In this embodiment, two stator units (stator cores) in the seventh embodiment of FIG. 11 are integrally formed.
That is, as shown in FIG. 19, the stator magnetic tooth rows are shifted in the circumferential direction on the basis of the reference line e on both sides in the z-axis direction (front and back of the stator magnetic yoke 108) of one ring-shaped stator magnetic yoke 108. 103 are formed. Other configurations are the same as those in FIG.
According to this embodiment, it is possible to determine the positional deviation of the (1/4) tooth pitch between the stator magnetic tooth rows 103 formed on the front and back of the stator magnetic yoke 108 with high accuracy. Further, since the stator magnetic yoke 108 is single, the thickness of the stator magnetic yoke 108 can be reduced by effectively using the magnetic path, and the material used can be reduced.

Next, FIG. 20 is a perspective view of a stator core in the twelfth embodiment of the present invention. In this embodiment, the stator core 104 in the fifth embodiment of FIGS. 8A and 8B is divided into a plurality in the circumferential direction.
FIG. 20 shows an example in which the stator core 104 of FIGS. 8A and 8B is divided into four along the circumferential direction. Actually, the divided core 109 is divided by mechanical means such as shrink fitting into a frame. Connect and use.

In the case where the stator core is formed of a dust core, if the stator core is integrally manufactured in a ring shape, the mold and the press machine are increased in size and cause high costs. Further, if a part of the molded core is damaged, the entire stator core may become a defective product.
On the other hand, if the stator core is divided into a plurality of parts as in the present embodiment, it is possible to reduce the cost by reducing the size of the mold and the press.
In addition, when the mold is made smaller, the dimensional accuracy is generally improved, and when some of the divided cores 109 are damaged, only the divided cores 109 need to be handled as defective, so that an improvement in yield can be expected.
In FIG. 20, the stator core is divided into four parts, but the stator core can be divided into a plurality of arbitrary parts. However, if the plurality of divided cores are equally divided so that they all have the same shape, parts can be shared, which is convenient.
As shown in FIG. 19, an integral stator core formed by forming stator magnetic tooth rows 103 on the front and back surfaces of the stator magnetic yoke 108 may be divided into a plurality in the circumferential direction.

As is clear from the above description, the main magnetic flux flow in the stator core is along the direction surrounding the current flow direction of the ring coil 300. Accordingly, one of the features of the ring coil motor according to the present invention is that the magnetic flux passing through the circumferentially divided portion of the stator core is very small, and the characteristic deterioration due to the division of the stator core is small.
Therefore, a gap can be provided on the abutting surface of the divided core 109 obtained by dividing the stator core. Thereby, the processing accuracy of the butted surface of the split core 109 and the accuracy of the gap distance can be relaxed, and the die processing cost can be reduced and the yield of the stator core can be improved.
Further, by providing a gap in the abutting surface of the split core 109, it is possible to cope with the thermal expansion of the split core 109. That is, the amount of thermal expansion of the split core 109 is grasped at the time of design, and a clearance is provided so that the split cores 109 do not collide with each other at the maximum expansion, thereby reducing the stress and reducing the stator magnetic tooth row and the rotor. The distance can be maintained with high accuracy.

Next, FIG. 21 is a perspective view of the main part of the stator core 111 in the thirteenth embodiment of the present invention. In FIG. 21, only a part of the circumferential direction of the stator core 111 is shown for convenience. The stator core 111 has a structure in which a coupling bridge 110 is added to the stator core 104 in the fifth embodiment shown in FIGS. 8A and 8B.
As described above, the stator magnetic tooth row generates torque by changing the flow of magnetic flux so as to face the rotor magnetic tooth row or the rotor magnetic pole. Therefore, it is important that the magnetic resistance of the stator magnetic tooth row as seen from the surface facing the rotor changes according to the presence or absence of teeth. That is, it is necessary that the magnetic resistance of the portion where the teeth are present is low and the magnetic resistance of the portion where the teeth are not present is high.

  On the other hand, as shown in FIG. 21, the position between the teeth of each of the stator magnetic tooth rows 106 and 107 is away from the surface facing the rotor (for the stator magnetic tooth row 106, the side closer to the z-axis between the teeth, For the tooth row 107 (the side far from the z-axis between the teeth), even if a magnetic material is present, the influence on the change in the magnetic resistance of the stator magnetic tooth row as viewed from the surface facing the rotor is small. Therefore, at this location (for the stator magnetic tooth row 106, the side close to the z-axis between the teeth, and for the stator magnetic tooth row 107, the side far from the z-axis between the teeth), adjacent teeth are connected by a magnetic material. There is no problem. From such a viewpoint, in the thirteenth embodiment, the coupling bridge 110 made of a magnetic material is arranged between the teeth of the stator magnetic tooth rows 106 and 107.

According to this embodiment, the mechanical strength of the tooth portions of the stator magnetic tooth rows 106 and 107 can be increased.
Further, in the stator magnetic tooth rows 106 and 107, the magnetic flux density increases from the tip portion toward the root portion. Therefore, by connecting adjacent teeth by the coupling bridge 110, magnetic flux flows through the coupling bridge to reduce the magnetic flux density, thereby making it difficult to cause magnetic saturation.
This thirteenth embodiment can be applied to the electromagnetic units of all the embodiments described above.

Note that when the coupling bridge 110 is arranged, if the coupling bridge is too close to the rotor magnetic tooth row or the magnetic pole, the coupling bridge becomes a path of leakage magnetic flux, and the magnetic flux linked to the coil is reduced and the torque is reduced. There's a problem. For this reason, it is necessary to consider that the coupling bridge is not too close to the rotor magnetic tooth row or magnetic pole.
On the other hand, the thicker the coupling bridge, the greater the mechanical strength. That is, there is a trade-off relationship between the magnetic characteristics and the mechanical characteristics regarding the thickness of the coupling bridge, but the optimum point can be found by magnetic field analysis, strength analysis, or the like.

As a modification of the present embodiment, as shown in FIGS. 22A and 22B, a coupling bridge 112 is formed by a base piece portion 112a and a step portion 112b provided on the base side (stator magnetic yoke 105 side). Thus, the base side may be thickened (the cross-sectional area is increased). 22A shows a state in which the ring-shaped coil 300 is housed between the stator magnetic tooth rows 106 and 107, and FIG. 22B shows a state in which the ring-shaped coil 300 is removed.
Since the coil 300 is housed in the root portions of the stator magnetic tooth rows 106 and 107, the distance from the rotor magnetic tooth row and the magnetic pole can be secured, so that the coupling bridge can be made closer to the rotor magnetic tooth row and the like. As shown in FIG. 22A and FIG. 22B, a thick coupling bridge 112 can be used. This coupling bridge 112 can increase the mechanical strength and further reduce the magnetic flux density.
Although various detailed shapes and structures of the coupling bridge are conceivable, in principle, it is desirable that the tip end side is relatively thin as described above, and that the root portion, particularly the vicinity of the storage portion of the coil 300, is thick.

Here, FIG. 23 is a plan view of the rotor unit 200F shown in FIGS. 14 and 15A. In FIG. 23, the amount of magnetic flux generated by the permanent magnet portion 221 is proportional to the cross-sectional area of the surface orthogonal to the magnetization direction when the magnetic flux density is constant. Since the motor torque has a positive correlation with the amount of magnetic flux generated by the permanent magnet, the larger the cross-sectional area of the surface orthogonal to the magnetization direction, the more advantageous from the viewpoint of torque increase.
In the example of FIG. 23, the magnetization direction of the permanent magnet portion 221 coincides with the circumferential direction of the rotor unit 200F, and the plane orthogonal to the magnetization direction of the permanent magnet portion 221 includes the central axis of the rotor unit 200F (in other words, (Including the radius of the rotor unit 200F). In this case, the cross-sectional area of the surface orthogonal to the magnetization direction of the permanent magnet portion 221 depends on the width W _mag of the permanent magnet portion 221 in the radial direction of the rotor unit 200F. In FIG. 23, 200r indicates a radial line including the radius of the rotor unit 200F, 221r ′ indicates a surface orthogonal to the magnetization direction of the permanent magnet portion 221, and in FIG. 23, the radial line 200r appears on the surface 221r ′. Will be included.

If the width W _mag of the permanent magnet portion 221 is increased in the radial direction of the rotor unit 200F, the cross-sectional area of the surface orthogonal to the magnetizing direction increases, so that the torque can be increased. However, in that case, since the volume of the soft magnetic part 222 between the permanent magnet parts 221 also increases, there is a problem that the weight of the rotor unit 200F increases as a whole.

Therefore, in the fourteenth embodiment of the present invention, a rotor unit 200I having a structure as shown in FIG. 24 is used. This rotor unit 200I increases the width W _mag of the permanent magnet portion 221d to increase the cross-sectional area of the surface orthogonal to the magnetization direction, and the surface 221r orthogonal to the magnetization direction of the permanent magnet portion 221d is the rotor unit 200I. The permanent magnet portion 221d is disposed so as not to include the central axis of the diameter, that is, to be inclined at a predetermined angle α with respect to the radial line 200r. In FIG. 24, reference numeral 226 denotes a soft magnetic part.
According to the fourteenth embodiment, the torque of the motor can be increased by increasing the cross-sectional area of the surface perpendicular to the magnetization direction of the permanent magnet portion 221d and increasing the amount of magnetic flux generated by the permanent magnet portion 221d. .

FIG. 25A is a plan view showing the main part of FIG. 23 together with the stator magnetic tooth rows 120X and 130X, which is substantially the same as FIG. 15C. On the other hand, FIG. 25B is a plan view showing the main part of FIG. 24 together with the stator magnetic tooth rows 120X and 130X.
In addition, the circumferential direction position of the inner peripheral surface and the outer peripheral surface of the soft magnetic part 226 is shifted depending on the magnitude of the angle α described above. Therefore, as shown in FIG. 25B, it is necessary to adjust the positions of the outer and inner stator magnetic tooth rows 120X and 130X so as to appropriately face the inner and outer peripheral surfaces of the soft magnetic portion 226, respectively.

Next, FIG. 26 is a plan view of a rotor unit 200J according to a fifteenth embodiment of the present invention.
In the rotor units 200F and 200I shown in FIGS. 23 and 24, etc., the soft magnetic portions 222 and 226 are individually separated, so that there is a problem that assembly is difficult. In view of this point, the fifteenth embodiment of the present invention facilitates assembly of the rotor unit.

That is, in FIG. 26, the soft magnetic part 227 is formed by laminating a large number of annular steel plates in the axial direction, and a square bar-like permanent magnet part in a substantially rectangular hole formed at equal intervals in the circumferential direction of the steel plate. The rotor unit 200J is configured by embedding 221e.
According to this structure, the soft magnetic part 227 can be integrated, and the permanent magnet part 221e can be fixed by being held by the soft magnetic part 227, so that the assembly work of the rotor unit 200J is greatly facilitated. Can do. In addition, what is necessary is just to fix the many steel plates laminated | stacked in order to comprise the soft-magnetic part 227 by using a through pin, caulking, bonding, etc. integrally.

In this embodiment, the permanent magnet part 221e is magnetically short-circuited by the inner and outer peripheral parts (the bridge part 221f in FIG. 26) of the hole for embedding the permanent magnet part of the soft magnetic part 227. That is, since the magnetic flux generated from the permanent magnet portion 221e circulates through the bridge portion 221f, the magnetic flux interlinked with the ring coil is reduced, and the motor torque may be reduced.
In order to solve this problem, the permanent magnet portion embedding hole in the soft magnetic portion 227 is formed as long as possible in the radial direction to narrow the width of the bridge portion 221f, and the bridge portion 221f is magnetically saturated to reduce the magnetoresistance. It needs to be bigger.
This type of technique is disclosed in, for example, a conventional embedded technique as described in paragraph [0014] of FIG. 1, Japanese Patent Laid-Open No. 2002-281700 (title of invention: rotor of embedded magnet type rotating machine), FIG. Since it is the same as the technique employ | adopted in order to reduce the leakage magnetic flux of a permanent magnet in a magnet type synchronous motor, detailed description is abbreviate | omitted here.

As described above, according to the rotor unit 200J of FIG. 26, the assembly is facilitated, but the torque is reduced.
Therefore, in the sixteenth embodiment of the present invention, the torque reduction due to the bridge portion 221f is prevented while the assembly of the rotor unit is facilitated to some extent.

  FIG. 27 is a plan view of a rotor unit 200K according to the sixteenth embodiment. In FIG. 26, reference numeral 228 denotes a plurality of soft magnetic portions that are divided and formed along the circumferential direction of the rotor unit 200K, and these soft magnetic portions 228 are separated from each other by a gap 221g. That is, by forming a gap 221g partially as shown in FIG. 27 instead of the bridge portion 221f in FIG. 26, the gap 221g prevents short-circuiting of the magnetic flux from the permanent magnet portion 221e, resulting in a ring coil. The decrease in torque is suppressed by increasing the number of flux linkages.

As a method of forming the gap 221g, the soft magnetic part 228 is divided into a plurality of parts in advance, and these are combined to form the gap 221g between adjacent soft magnetic parts 228, or as shown in FIG. A method is conceivable in which a part of the bridge portion 221f of the soft magnetic portion 227 formed in an annular shape is cut (removed) to make that portion a gap 221g.
In the former method, 360 ° is equally divided into a plurality of soft magnetic portions 228 (for example, six pieces as shown in FIG. 27), and these soft magnetic portions 228 are equally spaced on the circumference. What is necessary is just to attach and fix the permanent magnet part 221e after arrange | positioning.
On the other hand, in the latter method, the number of steps for cutting the bridge portion 221f increases, but the assembly before the previous steps is easy because the soft magnetic portion is integrated. In addition, the soft magnetic part is firmly fixed before the bridge part 221f is cut, and the remaining part does not move after the bridge part 221f is cut, so that the relative position of the soft magnetic part 228 after the cutting is obtained. Can be determined with high accuracy.

  In FIG. 27, the rotor unit 200K is formed using six soft magnetic portions 228 having the same shape, but the present invention is not limited to this embodiment. That is, the number of soft magnetic parts (in other words, the angle when 360 ° is divided into a plurality of parts), the position and number of gaps, and the like can be arbitrarily selected as necessary.

100A, 100B, 100F, 100G: Stator units 101, 104, 111: Stator cores 102, 105, 108: Stator magnetic yokes 103, 106, 107, 120X, 130X: Stator magnetic tooth row 109: Split cores 110, 112: Coupling bridge 112a: base piece portion 112b: stepped portions 120, 120a, 120b, 130, 130a, 130b, 140, 150: magnetic teeth 125, 135, 145, 155: gaps 200A, 200B, 200C, 200D, 200E, 200F, 200G, 200H, 200I, 200J, 200K: Rotor units 201, 203, 205, 208: Rotor magnetic yokes 202, 204, 206, 209: Rotor magnetic tooth rows 207, 210: Rotor magnetic poles 221, 221a, 221b, 221c, 21d, 221e, 223: permanent magnet portion 221f: bridge portion 221g: gaps 222, 222a, 222b, 222c, 222d, 224, 225, 226, 227, 228: soft magnetic portions 224A, 224B, 224C, 224D, 225A, 225B , 225C, 225D: Magnetic tooth 300: Ring coil 401, 402: Electromagnetic unit 501: Magnetic powder 502: Insulator

Claims (16)

A ring-shaped stator core having a ring-shaped stator magnetic yoke, and a plurality of stator magnetic teeth arranged regularly along the circumferential direction of the stator magnetic yoke;
A ring-shaped coil disposed coaxially with the stator core;
A stator unit,
as well as,
A rotor unit having at least one of a rotor magnetic tooth row and a rotor magnetic pole and disposed coaxially with the stator unit;
In an electromagnetic unit with
Each tooth of the stator magnetic tooth row is formed along the axial direction from the stator magnetic yoke,
The electromagnetic unit, wherein the rotor magnetic tooth row or the rotor magnetic pole is disposed to face the stator magnetic tooth row. The electromagnetic unit according to claim 1,
The electromagnetic unit, wherein the rotor magnetic tooth row or the rotor magnetic pole row and the stator magnetic tooth row are opposed to each other on the radially inner side or the outer side of the stator magnetic tooth row. The electromagnetic unit according to claim 1,
The stator magnetic tooth row is formed in two rows concentrically,
The ring coil is disposed between the two rows of stator magnetic teeth;
The electromagnetic unit, wherein the rotor magnetic tooth row or the rotor magnetic pole is disposed so as to be sandwiched between the two rows of stator magnetic tooth rows. In a motor comprising three or more electromagnetic units according to claim 1 or 2,
The stator units constituting each electromagnetic unit are connected to each other to form a stator, and the rotor units constituting each electromagnetic unit are connected to each other so as to be rotatable around the axis of the stator magnetic yoke to form a rotor.
The ring coil motor characterized in that the positional relationship between the stator magnetic tooth row and the rotor magnetic tooth row facing each other in each electromagnetic unit is shifted at equal intervals between the electromagnetic units. The motor according to claim 1 or 2, wherein the motor includes two electromagnetic units including the rotor unit having a rotor magnetic pole.
The stator units constituting each electromagnetic unit are connected to each other to form a stator, and the rotor units constituting each electromagnetic unit are connected to each other so as to be rotatable around the axis of the stator magnetic yoke to form a rotor.
The positional relationship between the stator magnetic tooth row and the rotor magnetic pole facing each other in each electromagnetic unit is shifted by approximately 1/4 of the tooth pitch of the stator magnetic tooth row between the electromagnetic units. Ring coil motor. In the electromagnetic unit given in any 1 paragraph of Claims 1-3,
An electromagnetic unit comprising a dust core as a magnetic material constituting the stator unit or the rotor unit. In the ring coil motor according to claim 4 or 5,
A ring coil motor using a powder magnetic core as a magnetic material constituting the stator unit or the rotor unit. The electromagnetic unit according to claim 3,
Each of the two rows of stator magnetic teeth has the same number of magnetic teeth,
The rotor magnetic pole is configured by alternately arranging a plurality of permanent magnet portions and soft magnetic portions in the rotation direction,
The total number of the soft magnetic portions is equal to the total number of magnetic teeth of the two rows of stator magnetic tooth rows, and the soft magnetic portions are disposed to face the two rows of stator magnetic tooth rows via a gap,
The plurality of permanent magnet portions are magnetized in opposite directions alternately in the rotation direction,
When one end of one soft magnetic part faces the magnetic teeth of one stator magnetic tooth row and the other end faces the gap of the other stator magnetic tooth row,
For the soft magnetic part adjacent to the one soft magnetic part, one end on the same side as the one end faces the gap of the one stator magnetic tooth row, and the other end on the same side as the other end is the other end. An electromagnetic unit characterized by facing the magnetic teeth of the stator magnetic tooth row. The electromagnetic unit according to claim 3,
Each of the two rows of stator magnetic teeth has the same number of magnetic teeth,
The rotor magnetic pole is composed of a permanent magnet portion magnetized in the rotation axis direction and two soft magnetic portions sandwiching the permanent magnet portion in the rotation axis direction,
The two soft magnetic portions respectively have a first row and a second row of magnetic tooth rows arranged to face the two rows of stator magnetic tooth rows via a gap,
When the magnetic teeth of the first row of one soft magnetic part are opposed to the magnetic teeth of one stator magnetic tooth row, and the magnetic teeth of the second row are opposed to the gap of the other stator magnetic tooth row,
For the other soft magnetic part, the first row of magnetic teeth on the same side as the first row faces the gap of one stator magnetic tooth row, and the second row of magnetic teeth on the same side as the second row Facing the magnetic teeth of the other stator magnetic tooth row. In the ring coil motor according to claim 5 or 7,
A ring coil motor characterized by integrally forming two stator units constituting each electromagnetic unit. The electromagnetic unit according to any one of claims 1, 2, 3, 8 or 9,
The electromagnetic unit, wherein the stator core includes a plurality of divided cores divided along a circumferential direction thereof. The electromagnetic unit according to claim 11,
An electromagnetic unit comprising a gap between adjacent divided cores. The electromagnetic unit according to any one of claims 1, 2, 3, 8, 9, 11 or 12.
Adjacent teeth of the stator magnetic tooth row are connected by a magnetic body at a position away from a surface facing the rotor. The electromagnetic unit according to claim 8, wherein
The permanent magnet portion is disposed so as to be inclined with respect to a radial line passing through the central axis of the rotor unit so that a surface perpendicular to the magnetization direction of the permanent magnet portion does not intersect the central axis of the rotor unit. Characteristic electromagnetic unit. The electromagnetic unit according to claim 3,
Each of the two rows of stator magnetic teeth has the same number of magnetic teeth,
The rotor unit is a rotor magnetic pole composed of a soft magnetic part formed by laminating a large number of steel plates formed in an annular shape and having a hole in which the permanent magnet part is embedded in the axial direction, and a permanent magnet part embedded in the hole. An electromagnetic unit comprising: The electromagnetic unit according to claim 15,
The rotor unit has a gap in which at least one of an inner peripheral portion and an outer peripheral portion of the soft magnetic portion forming the hole does not exist.

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