WO2016110966A1

WO2016110966A1 - Motor

Info

Publication number: WO2016110966A1
Application number: PCT/JP2015/050281
Authority: WO
Inventors: 五十嵐　和則; 欣司金川; 三四郎荻野; 據義内川
Original assignee: 株式会社ゲネシス・ラボ; 株式会社Ｎｓｃ; 福島県地域復興再生事業協同組合
Priority date: 2015-01-07
Filing date: 2015-01-07
Publication date: 2016-07-14

Abstract

The purpose of the present invention is to achieve highly efficient driving of a motor through a simple control. This motor 1 is configured to have: a rotor part 2 in which a plurality of rotor members 21a, 21b, 21c comprising a nonmagnetic section 10, rotor yokes 20a, 20b, 20c having grooves 11, an annular rotor-side permanent magnet 30, and rotor-side protruding sections 40, 40b are stacked in an axial direction; and a stator part 3 in which stator members 70a, 70b, 70c, of the same number as the rotor members 21a, 21b, 21c, are stacked such that stator-side protruding sections 61a, 61b are offset from each other by a predetermined pitch between the stator members adjacent to each other in the axial direction, the stator members comprising a stator yoke 60, stator-side protruding sections 61a, 61b, a stator-side coil 62, and a stator-side permanent magnet 63.

Description

Electric motor

The present invention relates to an electric motor.

A switch having a rotor part and a stator part having a plurality of projecting parts, and exciting the projecting parts of the stator part in order to attract the projecting parts of the rotor part to the projecting parts of the stator part and rotate the rotor part. There is a reluctance motor (SR motor) (see, for example, Patent Document 1).

JP-A-9-266654

The SR motor described above has the advantage that high rotation and high output can be obtained. On the other hand, in order to improve efficiency, the positional relationship between the protrusion of the rotor and the protrusion of the stator and the protrusion of the stator are excited. It is necessary to control the timing to be performed within a very small allowable range.

The present invention has been made under such a background, and an object thereof is to provide an electric motor capable of realizing high-efficiency driving by simple control.

The present invention is composed of a soft magnetic body, a rotor member having a plurality of rotor side protrusions and a plurality of rotor parts stacked in the axial direction so that the rotor side protrusions are aligned in the axial direction, and a soft magnetic body. A stator yoke, a stator side protrusion that protrudes toward the rotor part, is arranged in a straight line at a constant pitch, and a stator side that is wound in the circumferential direction on the opposite side of the stator side protrusion. A stator member composed of a coil and a ring-shaped stator-side permanent magnet that is opposite to the rotor-side protrusion and is NS-magnetized in the axial direction. An electric motor having a stator portion that is stacked in the same number as the rotor member so as to shift the pitch.

Alternatively, the electric motor of the present invention includes a rotor yoke having a cylindrical nonmagnetic body portion and a groove facing the nonmagnetic body portion, and a ring arranged in the groove and NS magnetized in the axial direction. And a plurality of rotor-side protrusions that are arranged in a straight line at a constant pitch at positions spaced apart from each other across the rotor-side permanent magnet. The rotor member is composed of a plurality of rotor members stacked in the axial direction so that the rotor-side protruding portions are aligned in the axial direction, and is composed of a soft magnetic material, and protrudes toward the stator yoke and the rotor portion, at positions separated from each other. A stator-side protrusion arranged in a straight line at a constant pitch, a stator-side coil wound in the circumferential direction on the opposite side of the stator-side protrusion, and a rotor side in the axial direction facing the rotor-side permanent magnet permanent magnet A stator member composed of a ring-shaped stator side permanent magnet magnetized in the opposite polarity is stacked in the same number as the rotor member so that the stator side protrusions are offset from each other by a predetermined pitch between the stator members adjacent in the axial direction. And a stator portion.

In the above-described electric motor of the present invention, the non-magnetic part can have a rotor side coil wound in the circumferential direction.

Further, in the electric motor of the present invention described above, the rotor portion or the stator portion may not be stacked but may be formed from one rotor yoke or one stator yoke.

According to the present invention, it is possible to provide an electric motor capable of realizing driving with high efficiency by simple control.

It is a lineblock diagram of the electric motor concerning a first embodiment of the present invention. It is a partially cutaway perspective view of the rotor part of FIG. FIG. 2 is a partially cutaway perspective view of the stator portion of FIG. 1 and also shows the insertion direction of the rotor portion. It is a figure which shows the magnetic path of a rotor part and a stator part when both the rotor side coil of FIG. 1 and a stator side coil are non-excited. It is a figure which shows the magnetic path of a rotor part and a stator part when the stator side coil of FIG. 1 is excited. It is a figure which shows the magnetic path of a rotor part and a stator part when both the rotor side coil and stator side coil of FIG. 1 are excited. It is a figure which shows the specific positional relationship of the rotor side protrusion part of FIG. 1, and a stator side protrusion part in order to demonstrate control of an electric motor. It is a figure which shows the specific positional relationship different from FIG. 7 of the rotor side protrusion part and stator side protrusion part of FIG. 1 in order to demonstrate control of an electric motor. It is a figure which shows the specific positional relationship different from FIG. 8 of the rotor side protrusion part and stator side protrusion part of FIG. 1 in order to demonstrate control of an electric motor. It is a figure which shows the specific positional relationship of the rotor side protrusion part and stator side protrusion part of the conventional common switched reluctance motor. It is a figure which extracts and shows a part of specific positional relationship of the rotor side protrusion part and stator side protrusion part of FIG. It is a figure which shows together the overlap of the stator side protrusion part of the 3 step | paragraph structure in the electric motor which concerns on 1st embodiment of this invention, and the overlap of the stator side protrusion part of a 6 step | paragraph structure. It is a block diagram of the electric motor which concerns on 2nd embodiment of this invention. It is the figure which looked at the rotor part of FIG. 13 from the axial direction. It is the figure which looked at the stator part of the upper stage which comprises the stator part of FIG. 13 from the axial direction. It is a figure which shows the stator part of the middle stage of FIG. 13 of the state which rotated the stator part of FIG. 15 to the circumferential direction 60 degree | times. It is a figure which shows the stator part of the lower stage of FIG. 13 of the state which rotated the stator part of FIG. 16 to the circumferential direction 60 degree | times. It is the figure which looked at the stator part which concerns on 4th embodiment of this invention from the axial direction. It is a figure which shows the state which rotated the stator part of FIG. 18 to the circumferential direction 15 degree | times. It is a figure which shows the state which rotated the stator part of FIG. 19 to the circumferential direction 15 degree | times. It is a figure which shows the state which rotated the stator part of FIG. 20 to the circumferential direction 15 degree | times. It is a figure which shows the state which rotated the stator part of FIG. 21 15 degree | times in the circumferential direction. It is a figure which shows the state which rotated the stator part of FIG. 22 to the circumferential direction 15 degree | times. FIG. 24 is an unfolded view showing the arrangement of the stator-side protrusions when the stator members of FIGS. 18 to 23 are stacked in six stages. FIG. 25 is a diagram showing an expanded arrangement of the stator side protrusions when the stator members of FIGS. 18 to 23 are stacked in six stages, and shows a wider width than the stator side protrusions of FIG. .

(First embodiment)
An electric motor 1 according to a first embodiment of the present invention will be described with reference to FIGS.

The electric motor 1 has a columnar rotor portion 2 and a cylindrical stator portion 3 surrounding the rotor portion 2 as shown in FIGS. The rotor unit 2 has a rotating shaft 4.

The rotor part 2 of the electric motor 1 has three

rotor yokes

20a, 20b and 20c. The first rotor yoke 20a has a rotor member 21a, the second rotor yoke 20b has a rotor member 21b, and the third rotor yoke 20c has a rotor member 21c. Each of the

rotor members

21a, 21b, and 21c is made of a soft magnetic material, and includes a cylindrical nonmagnetic material portion 10 and a groove 11 that faces the nonmagnetic material portion 10. Each non-magnetic member 10 is provided with a rotor-side coil 12 that is wound in the circumferential direction and in a cylindrical shape.

Further, the rotor yoke 20a is disposed in the groove 11 and protrudes closer to the stator side than the rotor-side permanent magnet 30 and the ring-shaped rotor-side permanent magnet 30 which is NS magnetized in the axial direction. A plurality of rotor-

side protrusions

40a and 40b are arranged in a straight line at a constant pitch at positions spaced apart from each other. The

rotor yokes

20b and 20c have the same configuration as the rotor yoke 20a.

The stator unit 3 is made of a soft magnetic material and includes three

stator members

70a, 70b, and 70c. The stator member 70a is wound around the stator yoke 60, the stator-

side protrusions

61a and 61b that protrude to the rotor part 2 side, are arranged in a straight line at a constant pitch, and are circumferentially and cylindrically wound. And a ring-shaped stator side permanent magnet 63 which is opposed to the rotor side permanent magnet 30 and is magnetized in the axial direction with a polarity opposite to that of the rotor side permanent magnet 30. The

stator members

70b and 70c have the same configuration as the stator member 70a.

The

stator members

70a, 70b, and 70c are arranged such that the stator

side protruding portions

61a and 61b are shifted from each other by a predetermined pitch in the circumferential direction between the stator members adjacent in the axial direction. In FIG. 3, the

stator side protrusions

61a and 61b are shifted from each other by a half pitch between the stator members adjacent in the axial direction. However, this is illustrated as such for the sake of convenience of illustration. , Different from the actual. For example, in practice, the

stator side protrusions

61a and 61b are displaced so as to overlap each other between the stator members adjacent in the axial direction.

The axial thicknesses of the

rotor members

21a, 21b, and 21c and the axial thicknesses of the

stator members

70a, 70b, and 70c are substantially the same, and the electric motor 1 stacks the

rotor members

21a, 21b, and 21c in the axial direction. The rotor portion 2 and the stator portion 3 in which the

stator members

70a, 70b, and 70c are stacked in the axial direction. In the example of FIGS. 1 to 3, both the rotor portion 2 and the stator portion 3 have a three-stage configuration.

The

rotor members

21a, 21b, and 21c each have the rotor-side coil 12 as described above. The winding start and the winding end of each rotor side coil 12 are connected to an external slip ring 90 through the inside of the rotary shaft 4 which is connected in parallel and has a hollow structure. Thereby, electric power is supplied to each rotor side coil 12 from the outside. 2 and 3, the illustration that the rotary shaft 4 has a hollow structure is omitted.

Next, control for driving the electric motor 1 will be described with reference to FIGS. 4 to 6 are views showing only a part of one of the left and right sides when viewed from the rotating shaft 4 which is the central axis of the electric motor 1. FIG.

FIG. 4 schematically shows the magnetic paths M1 and M2 of the rotor portion 2 and the stator portion 3 when neither the rotor-side coil 12 nor the stator-side coil 62 is excited (not energized). At this time, only the magnetic path M1 by the rotor-side permanent magnet 30 and the magnetic path M2 by the stator-side permanent magnet 63 are formed. At this time, since electric power is not supplied to the electric motor 1, the electric motor 1 is in a stopped state. Further, at this time, since no magnetic suction force is generated between the rotor portion 2 and the stator portion 3, no cogging occurs when the rotating shaft 4 of the rotor portion 2 is rotated from the outside.

FIG. 5 schematically shows magnetic paths M3 and M4 in a state where only the stator side coil 62 is excited without exciting the rotor side coil 12. At this time, the magnetic flux of the rotor-side permanent magnet 30 is attracted to the excited stator-side coil 62 to form a magnetic path M3. Further, since the magnetic flux of the rotor-side permanent magnet 30 is directed toward the stator portion 3, the magnetic flux of the stator-side permanent magnet 63 is attracted to the rotor-side permanent magnet 30 to form the magnetic path M4. At this time, the motor 1 is switched reluctance motor by appropriately controlling the excitation or non-excitation of the stator side coil 62 according to the positional relationship between the

rotor side protrusions

40a and 40b and the

stator side protrusions

61a and 61b. SR motor).

FIG. 6 schematically shows magnetic paths M5 and M6 in a state where both the rotor side coil 12 and the stator side coil 62 are excited. The currents flowing in both

coils

12 and 62 are in the same direction, and the magnetic paths generated in both

coils

12 and 62 are in the same direction and are integrated into a magnetic path M5. That is, at this time, the magnetic fluxes of the rotor side coil 12 and the stator side coil 62 are attracted to each other to form the magnetic path M5. As a result, the magnetic flux of the rotor-side permanent magnet 30 and the magnetic flux of the stator-side permanent magnet 63 are attracted to each other to form a magnetic path M6. At this time, the motor 1 is switched reluctance motor by appropriately controlling the excitation or non-excitation of the stator side coil 62 according to the positional relationship between the

rotor side protrusions

40a and 40b and the

stator side protrusions

61a and 61b. SR motor). Further, at this time, the suction force between the

rotor side protrusions

40a and 40b and the

stator side protrusions

61a and 61b is stronger than in the state shown in FIG. A larger rotational torque can be generated compared to the state shown.

Thus, the electric motor 1 supplies power only to the stator side coil 62 as shown in FIG. 5, and supplies power to both the rotor side coil 12 and the stator side coil 62 as shown in FIG. You can switch between modes. The former mode can consume less power than the latter mode. In the latter mode, a larger rotational torque can be obtained than in the former mode.

Next, the control for rotating the electric motor 1 will be described in more detail with reference to FIGS. 7 to 9, the solid line squares represent the

stator members

70a, 70b, 70c having the

stator side protrusions

61a, 61b and the stator side permanent magnet 63, as illustrated in part of FIG. 7 to 9 represent

rotor members

21a, 21b, and 21c having rotor-

side protrusions

40a and 40b and a rotor-side permanent magnet 30, as illustrated in FIG. 7 to 9, a portion where the

rotor side protrusions

40a and 40b and the

stator side protrusions

61a and 61b partially overlap is shown as an overlap W.

7 shows the other

rotor side protrusions

40a and 40b, and thus the

rotor members

21a, 21b and 21c have a gap G of a certain length in the

rotor side protrusions

40a and 40b. It has the composition arranged. In FIGS. 8 and 9, the alternate long and short dash line showing the other rotor-

side protrusions

40a and 40b shown in FIG. 7 is omitted.

In the example of FIG. 7, the

rotor side protrusions

40a and 40b of the rotor member 21c and the

stator side protrusions

61a and 61b of the stator member 70c face each other. At this time, the stator side coil 62 of the stator member 70c is excited on the stator portion 3 side.

In order to further rotate the rotating shaft 4 of the electric motor 1 from the state shown in FIG. 7, the stator side coil 62 of the stator member 70b is excited. As a result, as shown in FIG. 8, the

rotor side protrusions

40a and 40b of the rotor member 21b and the

stator side protrusions

61a and 61b of the stator member 70b face each other.

In order to further rotate the rotating shaft 4 of the electric motor 1 from the state shown in FIG. 8, the stator side coil 62 of the stator member 70a is excited. As a result, as shown in FIG. 9, the

rotor side protrusions

40a and 40b of the rotor member 21a and the

stator side protrusions

61a and 61b of the stator member 70a face each other.

Thus, by sequentially exciting the stator side coils 62 of the

stator members

70a, 70b, 70c, the rotating shaft 4 of the electric motor 1 can continue to rotate in a certain direction.

FIG. 10 shows a general switched reluctance motor (SR motor) as a comparative example. FIG. 11 shows the positional relationship between the stator side protrusions P1, Q1, R1, P2, Q2 and the rotor side protrusions p, q, r, focusing on the encircled portion of the broken line in FIG.

10 and 11, the rotor-side protrusion q and the stator-side protrusion R1 are almost opposed to each other. At this time, the area of the overlap Wa between the rotor side protrusion p and the stator side protrusion Q1 and between the rotor side protrusion r and the stator side protrusion Q2 is compared with the area of the overlap W shown in FIGS. It turns out that it is very little.

In order to further rotate the SR motor from the state shown in FIGS. 10 and 11, the stator side protrusions Q1 and Q2 are excited. At this time, if the area of the overlap Wa is small, the force by which the stator-side protrusions Q1, Q2 attract the rotor-side protrusions p, r also becomes small, so that a large rotational torque cannot be obtained efficiently.

In addition, if the area of the overlap Wa is small, the control is required to accurately capture the timing at which the stator side protrusions Q1, Q2 overlap the rotor side protrusions p, r within a short time. It becomes complicated.

As described above, the electric motor 1 can have a larger portion indicated by the overlap W in the drawings of FIGS. 7 to 9 as compared with a general SR motor. This is because when the

stator members

70a, 70b, 70c are overlapped, the pitch in the axial direction of the

stator side protrusions

61a, 61b of the

stator members

70a, 70b, 70c can be shifted to a free angle. This is because an overlap W having a desired size can be obtained.

As described above, in the electric motor 1, the overlap W between the

rotor side protrusions

40a and 40b and the

stator side protrusions

61a and 61b can be freely increased as compared with a general SR motor. Thereby, compared with the control of a general switched reluctance motor (SR motor), the electric motor 1 can easily grasp the timing of overlap and can simplify the control. Further, the electric motor 1 can efficiently obtain a large rotational torque by utilizing the size of the overlap area.

Thus, the electric motor 1 is formed by stacking a plurality of

rotor members

21a, 21b, 21c and

stator members

70a, 70b, 70c. Accordingly, the motor 1 can be easily configured by stacking the

rotor members

21a, 21b, 21c,... And the

stator members

70a, 70b, 70c,.

12 shows an example of the electric motor 1 in which the stator members 70a to 70c are stacked in three stages and an example of the electric motor 1a in which the stator members 70a to 70f are stacked in six stages. Comparing the area of the overlap W in the three-stage stacked stator members 70a to 70c with the area of the overlap W1 (W11 + W12) in the six-stage stacked stator members 70a to 70f, it can be seen that W <W1. As described above, according to the electric motor 1a, the rotor member 21 and the stator member 70 can be stacked in a desired number of stages so that the electric motor 1a can be configured relatively easily. Therefore, the overlap area and the like can be freely set. be able to.

For example, in the SR motor of Patent Document 1, a coil is wound around the stator side protruding portion, but in the

electric motors

1 and 1a, the stator side coil 62 is wound inside the

stator members

70a, 70b, 70c and the like. According to this, the arrangement position of the

stator side protrusions

61a and 61b is not limited by the arrangement position of the coil, and the degree of freedom in design can be improved. In addition, this makes it possible to easily cope with multipolarization.

Further, for example, in the SR motor of Patent Document 1, the rotor portion does not have a permanent magnet, and the magnetic path passes through the rotor portion and is formed between the stator side protrusions in which the stator portion is excited. On the other hand, as shown in FIG. 5 or FIG. 6, the

electric motors

1 and 1a are formed between the rotor-

side protrusions

40a and 40b and the stator-

side protrusions

61a and 61b, which are opposed to each other, and are short. A magnetic path is formed efficiently. Also by this, the

electric motors

1 and 1a can obtain a high rotational torque efficiently.

In the above-described embodiment, the configuration in which the rotor side coil 12 has the rotor side coil 12 has been described. However, the rotor side coil 12 may be omitted. According to this, magnetic paths M3 and M4 shown in FIG. 5 are formed, and a power-saving electric motor can be realized.

(Second embodiment)
An electric motor 1b according to a second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 13, the electric motor 1c has a stator portion 3a having substantially the same configuration as the stator portion 3 of the first embodiment. However, the stator part 3a is different from the

stator side protrusions

61a and 61b of the stator part 3 in the area of the stator side protrusions 61aa and 61ba.

Further, as shown in FIGS. 13 and 14, the electric motor 1b is different in the rotor part 2a from the rotor part 2 of the first embodiment. That is, the rotor part 2a does not have a permanent magnet or a coil, but is simply formed in a shape as shown in FIGS. 13 and 14 by a magnetic member. The rotor part 2a has a rotor side protruding part 40g.

As shown in FIG. 17, the stator portion 3a of the electric motor 1b is arranged so that the stator side protruding portion 61aa faces the rotor side protruding portion 40g shown in FIG. FIG. 15 shows the stator member 70aa.

Further, as shown in FIG. 16, the stator portion 3 a of the electric motor 1 b is arranged such that a stator member 70 ba in a state rotated from the state of FIG. 15 in the circumferential direction by 60 degrees is overlapped under the stator member 70 aa.

Further, as shown in FIG. 17, the stator portion 3a of the electric motor 1b is arranged such that a stator member 70ca rotated in the circumferential direction by 60 degrees from the state of FIG. 16 is stacked under the stator member 70ba. In this manner, the stator side protrusions 61aa, 61ba, 61ca, 61da, 61ea, and 61fa having pitches shifted from each other by 60 degrees are formed on the stator portion 3a in three stages.

(Other embodiments)
Various modifications can be made to the embodiment of the present invention without departing from the gist thereof. For example, FIGS. 18 to 23 show the stator members 70ab to 70fb of the stator portion 3b having a six-stage configuration. The stator member 70ab shown in FIG. 18 and the stator member 70bb shown in FIG. 19 are different in the circumferential angle of the stator-side protruding portion 61ab by 15 degrees. The stator member 70bb shown in FIG. 19 and the stator member 70cb shown in FIG. 20 are different in the angle in the circumferential direction of the stator side protrusion 61ab by 15 degrees. The stator member 70cb shown in FIG. 20 and the stator member 70db shown in FIG. 21 are different in the angle in the circumferential direction of the stator side protruding portion 61ab by 15 degrees. The stator member 70db shown in FIG. 21 and the stator member 70eb shown in FIG. 22 differ in the circumferential angle of the stator-side protruding portion 61ab by 15 degrees. The stator member 70eb shown in FIG. 22 and the stator member 70fb shown in FIG. 23 differ in the circumferential angle of the stator side protruding portion 61ab by 15 degrees.

The stator portion 3b can be configured by stacking such stator members 70ab to 70fb in six stages.

24 and 25 are views showing the stator side protrusions 61ab of the stator members 70ab to 70fb formed in six stages. 24 shows an example in which the circumferential width of the stator side protrusion 61ab in FIG. 24 is narrower than the circumferential width of the stator side protrusion 61ab in FIG. In addition to this, the deviation between the number of steps of the stator member and the circumferential angle of the stator-side protruding portion can be easily and variously changed according to the user's request.

In the above-described embodiment, the inner rotor type

electric motors

1, 1 a, 1 b have been described, but an outer rotor type may be used.

In the above-described embodiment, the

stator members

70a, 70b, 70c, 70aa, 70ba, 70ca, 70ab, 70bb, 70cb are adjusted to adjust the overlapping angle of the

stator members

70a, 70b, 70c, 70aa, 70ba, The angle between the pitches of the

stator side protrusions

61a, 61b, 61aa, 61ba between 70ca, 70ab, 70bb, 70cb is given, but between the pitches of the rotor side protrusions 40a-40g on the

rotor members

21a, 21b, 21c side. The angle may be given.

In the above-described embodiment, the electric motor is shown. However, the electric motor may be configured to generate electric power on the stator unit 3 side by rotating the

rotor units

2 and 2a. In this case, as a method of rotating the

rotor parts

2 and 2a, a method of mechanically driving the

rotor parts

2 and 2a, a method of flowing current through the rotor side coils 12 and 12a in addition to mechanical driving, and the like may be employed. .

The rotor part 2 and the stator part 3 are formed from a plurality of rotor members and stator members, but either one or both may be integrated. For example, a single rotor yoke or a single stator yoke may be used.

DESCRIPTION OF

SYMBOLS

1, 1a ... Electric motor, 2, 2a ... Rotor part, 3, 3a, 3b ... Stator part, 4 ... Rotating shaft, 10 ... Nonmagnetic part, 11a, 11b, 11c ... Groove, 12, 12a ... Rotor side coil, 20a, 20b, 20c ... rotor yoke, 21a, 21b, 21c ... rotor member, 30a, 30b, 30c ... rotor side permanent magnet, 40a, 40b, 40c, 40d, 40e, 40f, 40g ... rotor side protrusion, 60 ... stator Yoke, 61a, 61b, 61aa, 61ab ... Stator side protrusion, 62 ... Stator side coil, 70a, 70b, 70c, 70aa, 70ba, 70ca, 70ab, 70bb, 70cb, 70db, 70eb, 70fb ... Stator member

Claims

A rotor portion made of a soft magnetic material and having a plurality of rotor members each having a plurality of rotor-side protrusions stacked in the axial direction such that the rotor-side protrusions are straight in the axial direction;
It is made of a soft magnetic material, and protrudes toward the stator yoke, the rotor portion side, and is arranged in a straight line at a constant pitch at positions spaced apart from each other. A stator member comprising a stator side coil wound in the direction and a ring-shaped stator side permanent magnet facing the rotor side protruding portion and NS magnetized in the axial direction, the stator member adjacent in the axial direction A stator portion that is stacked in the same number as the rotor member such that the stator side protruding portions are shifted from each other by a predetermined pitch,
Having
An electric motor characterized by that.
A rotor yoke made of a soft magnetic material and having a cylindrical non-magnetic material portion and a groove toward the non-magnetic material portion, and a ring-shaped rotor-side permanent magnet disposed in the groove and NS magnetized in the axial direction And a plurality of rotor-side projecting portions that are arranged in a straight line at a constant pitch at positions spaced apart from each other across the rotor-side permanent magnet. A rotor portion in which a plurality of members are stacked in the axial direction so that the rotor side protruding portions are aligned in a straight line; and
It is made of a soft magnetic material, and protrudes toward the stator yoke, the rotor portion side, and is arranged in a straight line at a constant pitch at positions spaced apart from each other. A stator member comprising: a stator-side coil wound in a direction; and a ring-shaped stator-side permanent magnet that is opposed to the rotor-side permanent magnet and is magnetized in the opposite direction to the rotor-side permanent magnet in the axial direction. A stator portion that is stacked in the same number as the rotor member such that the stator side protruding portions are displaced from each other by a predetermined pitch between the stator members adjacent in the axial direction;
Having
An electric motor characterized by that.
The electric motor according to claim 2, wherein
The non-magnetic body portion has a rotor side coil wound in the circumferential direction.
An electric motor characterized by that.
The electric motor according to any one of claims 1 to 3,
The rotor part or stator part is not stacked and is formed from one rotor yoke or one stator yoke,
An electric motor characterized by that.