JP5610989B2 - Rotating motor - Google Patents

Description

  The present invention relates to a rotary electric motor suitable for application to an electric motor having a cantilever bearing structure that requires ultra-high speed rotation, for example.

  In a conventional electric compressor, a substantially central portion of a shaft is supported by a bearing, a turbine is attached to one end of the shaft, a motor rotor is attached to the other end of the shaft, and the electric motor is disposed so as to surround the motor rotor. (For example, refer to Patent Document 1).

JP 2009-174491 A

  In the conventional electric compressor, since the motor rotor is attached to the other end of the shaft and is cantilevered, the shaft is inclined with respect to the shaft center of the bearing due to a gap between the bearing and the shaft. Become. Further, during operation, a magnetic attractive force is generated between the electric motor and the motor rotor, and the inclination of the shaft with respect to the axis of the bearing increases. Therefore, there has been a problem that the motor rotor comes into contact with the stator core of the electric motor and is damaged during operation.

  As a measure for solving such a problem, the gap on the opposite side of the bearing between the motor rotor and the stator core of the electric motor is made wider than the gap on the bearing side between the motor rotor and the stator core of the electric motor, so that the motor rotor and the electric motor are It is conceivable to avoid contact with the stator core. For example, the stator core of the electric motor is composed of first and second stator core bodies having different inner diameters, the first stator core body having a smaller inner diameter is disposed on the bearing side, and the second stator core body having the larger inner diameter is disposed on the opposite side of the bearing. Thus, contact between the motor rotor and the stator core of the electric motor may be avoided.

  Here, in the conventional electric compressor, an alternating current is passed through the coil of the electric motor to generate torque for rotationally driving the motor rotor. The alternating magnetic flux generated by flowing an alternating current through the coil flows from the stator core to the motor rotor through a narrow portion between the stator core and the motor rotor. Therefore, since the alternating magnetic flux flowing through the second stator core body having a wide gap between the motor rotor flows to the first stator core body side where the gap between the motor rotor and the motor rotor is narrow, an eddy current is generated between the first stator core body and the second stator core. A new problem arises in that the iron loss generated in the electric motor increases when flowing in the magnetic steel plate near the boundary with the body.

  The present invention has been made to solve such a problem, and is a rotary electric motor that can avoid contact between the rotor and the stator during operation and can suppress an increase in iron loss generated in the stator. The purpose is to obtain.

A rotary electric motor according to the present invention includes a frame, a rotor attached to a rotary shaft that is cantilevered on the frame via a bearing, and a stator core attached to the frame so as to surround the rotor. And a stator having a stator coil that is wound around the stator core and generates torque for rotating the rotor. And it is comprised so that the space | gap between the said rotor and the said stator core may spread in a step shape in the direction away from the said bearing, and the said stator core is each comprised by laminating | stacking a magnetic thin plate, respectively. The same number of stator core bodies as the number of steps are separated from each other at the position between the steps of the gap, and are arranged coaxially in the axial direction, and the gap between the stator core bodies arranged in the axial direction is It is wider than the largest gap between the rotor and the stator core .

According to the present invention, since the gap between the rotor and the stator core is configured to expand stepwise in the direction away from the bearing, the rotating shaft that is cantilevered by the bearing is the shaft center of the bearing. Even if it inclines with respect to, contact with a rotor and a stator core is avoided.
In addition, since the stator core bodies are spaced apart from each other at positions between the gap steps and are coaxially arranged in the axial direction, an alternating magnetic flux generated by energizing the stator coil is generated between the stator core bodies. Is suppressed from flowing from a wide gap to a narrow gap. Thus, iron loss generated in the stator core can be reduced.

It is sectional drawing which shows typically the main structures of the rotary electric motor which concerns on Embodiment 1 of this invention. It is sectional drawing which shows typically the main structures of the rotary electric motor as a comparative example. It is sectional drawing which shows typically the main structures of the rotary electric motor which concerns on Embodiment 2 of this invention. It is a partially broken perspective view which shows the main structures of the rotary electric motor which concerns on Embodiment 3 of this invention. It is sectional drawing which shows typically the main structures of the rotary electric motor which concerns on Embodiment 3 of this invention. It is sectional drawing which shows typically the main structures of the rotary electric motor which concerns on Embodiment 4 of this invention.

  Hereinafter, preferred embodiments of a rotary electric motor according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view schematically showing the main configuration of a rotary electric motor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view schematically showing the main configuration of a rotary electric motor as a comparative example.

  In FIG. 1, a rotary electric motor 1 includes a rotary shaft 2 made of a blocky magnetic material such as iron, one end of which is rotatably supported by a bearing 10, a rotor 3 fixed to the rotary shaft 2, and a rotor 3. And a frame 9 that houses the rotor 3 and the stator 4.

Although not shown in detail, the rotor 3 is configured by embedding magnets on the outer peripheral side of a cylindrical laminate produced by laminating magnetic steel plates, and is fixed to the rotary shaft 2 coaxially.
The stator 4 includes a stator core 5 and a stator coil 8 that is wound around the stator core 5 and serves as a torque generating drive coil that rotationally drives the rotor 3.

  The stator core 5 includes first and second stator core bodies 6 and 7 which are produced by laminating and integrating a plurality of magnetic steel plates each formed into a predetermined shape. The first and second stator core bodies 6 and 7 have cylindrical core backs 6a and 7a, and are projected radially inward from the inner peripheral surfaces of the core backs 6a and 7a, respectively, and are equiangularly spaced in the circumferential direction. And teeth 6b and 7b arranged in the above. And the slot opened to the inner peripheral side is defined by the core backs 6a and 7a and the teeth 6b and 7b. Here, the first stator core body 6 is configured in the same manner as the second stator core body 7 except that the length of the teeth 6b is longer than the length of the teeth 7b and the core inner diameter is small. ing.

The first and second stator core bodies 6, 7 are coaxially arranged with a gap d in the axial direction so that the circumferential positions of the teeth 6 b, 7 b are aligned, and surround the rotor 3. It is stored inside. Therefore, the gap Gf between the second stator core body 7 and the rotor 3 is wider than the gap Gn between the first stator core body 6 and the rotor 3.
The stator coil 8 is configured as a so-called concentrated winding in which a conductor wire is wound around a pair of teeth 6 b and 7 b that are opposed to each other in the axial direction of the first and second stator core bodies 6 and 7. .

  The frame 9 is made of a massive magnetic material such as iron and is in close contact with the outer peripheral surface of the core back 6a of the first stator core body 6 and the outer peripheral surface of the core back 7a of the second stator core body 7. It is disposed and constitutes an axial magnetic path forming member. When the frame 9 is made of a nonmagnetic material, members made of a magnetic material such as iron are used as the outer peripheral surface of the core back 6a of the first stator core body 6 and the second stator core body 7. What is necessary is just to arrange | position so that the outer peripheral surface of the core back 7a may be contact | connected.

Next, the effect of the first embodiment will be described in comparison with a comparative example.
In addition, as shown in FIG. 2, the rotary electric motor 100 as a comparative example is such that the first and second stator core bodies 6 and 7 are coaxially arranged in the axial direction so as to be in contact with each other. Except for this, the configuration is the same as that of the rotary motor 1.

  First, in the rotary electric motor 100 as a comparative example, the gap Gf between the second stator core body 7 and the rotor 3 is wider than the gap Gn between the first stator core body 6 and the rotor 3. ing. That is, the gap on the opposite side of the bearing 10 between the stator core 5 and the rotor 3 is wider than the gap on the bearing 10 side between the stator core 5 and the rotor 3. Therefore, even when the rotary shaft 2 is inclined with respect to the shaft center of the bearing 10, the rotor 3 is prevented from contacting the stator core 5 during the operation of the rotary electric motor 100.

  However, in the rotary electric motor 100, the first and second stator core bodies 6 and 7 are arranged side by side in the axial direction so as to contact each other. Therefore, an alternating magnetic flux generated by energizing the stator coil 8 flows from the second stator core body 7 to the first stator core body 6 as indicated by an arrow A in FIG. It tries to flow from the core body 6 to the rotor 3 through the narrow gap Gn. At this time, an eddy current flows through the magnetic steel plate located near the boundary between the first stator core body 6 and the second stator core body 7, and the iron loss generated in the stator core 5 increases.

  Also in the rotary electric motor 1 according to the first embodiment, the gap Gf between the second stator core body 7 and the rotor 3 is wider than the gap Gn between the first stator core body 6 and the rotor 3. Therefore, similarly to the rotary motor 100 as the comparative example, the rotor 3 is prevented from coming into contact with the stator core 5 during the operation of the rotary motor 1.

  In the rotary electric motor 1, the first and second stator core bodies 6, 7 are arranged side by side in the axial direction while ensuring a gap d, and therefore between the first and second stator core bodies 6, 7. Since the magnetic resistance increases and the stator coil 8 is energized, the alternating magnetic flux flowing from the second stator core body 7 to the first stator core body 6 can be reduced. Therefore, the eddy current flowing in the magnetic steel sheet located near the boundary between the first stator core body 6 and the second stator core body 7 is reduced, and the iron loss generated in the stator core 5 can be reduced.

  Further, the inner diameter of the second stator core body 7 is made larger than the inner diameter of the first stator core body 6, and the gap between the rotor 3 and the stator core 5 is widened stepwise in the direction away from the bearing 10. Since it is comprised so that adjustment of the space | gap between the rotor 3 and the stator core 5 can be adjusted in a post process, an assembly man-hour decreases.

  Here, from the viewpoint of reducing the alternating magnetic flux flowing from the second stator core body 7 to the first stator core body 6, the gap d between the first and second stator core bodies 6, 7 is defined as It is preferable that the gap is larger than the gap Gf between the two stator core bodies 7 and the rotor 3.

  In the first embodiment, the stator core is divided into two stator core bodies having different inner diameters, but the number of stator core divisions may be three or more. In this case, the divided stator core bodies are configured to have different inner diameters, and may be arranged in the axial direction so that the inner diameters gradually increase in the direction away from the bearing side and are separated from each other.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view schematically showing a main configuration of a rotary electric motor according to Embodiment 2 of the present invention.

  In FIG. 3, the rotor 11 includes a large-diameter first rotor core body 12 and a small-diameter second rotor core body 13. The first and second rotor core bodies 12 and 13 are each configured by embedding magnets on the outer peripheral side of a cylindrical laminate produced by laminating magnetic steel plates, and the first rotor core body 12 is used as a bearing 10. They are positioned on the side, arranged in the axial direction so as to be in contact with each other, and are fixed to the rotary shaft 2 coaxially.

The stator 14 includes a stator core 15 and a stator coil 8 that is wound around the stator core 15 and serves as a torque generating drive coil that rotationally drives the rotor 3.
The stator core 15 has first and second stator core bodies 16 and 17 that are produced by laminating and integrating a large number of magnetic steel plates each formed into a predetermined shape. The first and second stator core bodies 16 and 17 are formed in the same shape, and project from the cylindrical core backs 16a and 17a and radially inward from the inner peripheral surfaces of the core backs 16a and 17a, respectively. And teeth 16b and 17b arranged at an equiangular pitch in the circumferential direction. And the slot opened to the inner peripheral side is defined by the core backs 16a and 17a and the teeth 16b and 17b.

The first and second stator core bodies 16, 17 are coaxially arranged with a gap d in the axial direction so that the circumferential positions of the teeth 16 b, 17 b are aligned, and surround the rotor 11. It is stored inside. Therefore, the gap Gf between the second stator core body 17 and the second rotor core body 13 is wider than the gap Gn between the first stator core body 16 and the first rotor core body 12. . And the contact part of the 1st rotor core body 12 and the 2nd rotor core body 13 is located in the clearance gap between the 1st stator core body 16 and the 2nd stator core body 17 regarding an axial direction. doing.
Other configurations are the same as those in the first embodiment.

  Also in the rotary electric motor 1 </ b> A configured as described above, the gap Gf between the second stator core body 17 and the second rotor core body 13 causes the first stator core body 16, the first rotor core body 12, and Therefore, the rotor 11 is prevented from contacting the stator core 5 during the operation of the rotary electric motor 1A.

  Further, since the first and second stator core bodies 16 and 17 are arranged side by side in the axial direction while ensuring a gap d, the magnetic resistance between the first and second stator core bodies 16 and 17 is increased. In addition, the alternating magnetic flux flowing from the second stator core body 17 to the first stator core body 16 due to energization of the stator coil 8 can be reduced. Therefore, the eddy current flowing in the magnetic steel sheet located near the boundary between the first stator core body 16 and the second stator core body 17 is reduced, and the iron loss generated in the stator core 15 can be reduced.

  Further, the outer diameter of the second rotor core body 17 is made smaller than the outer diameter of the first rotor core body 16, and the gap between the rotor 11 and the stator core 15 is stepped away from the bearing 10. Therefore, the amount of unbalance at a location away from the bearing 10 is reduced.

  In the second embodiment, the rotor is divided into two rotor core bodies having different outer diameters. However, the number of rotor divisions may be three or more. The divided rotor core bodies are configured so that the outer diameters are different from each other, and may be arranged in the axial direction so that the outer diameter gradually decreases in the direction away from the bearing side. In this case, the stator core may be similarly divided into the same number of stator core bodies as the rotor, and separated from each other and arranged in the axial direction. The inner diameters of the divided stator core bodies are the same, and the contact portion of the rotor core body is located in the gap between the stator core bodies in the axial direction.

In the first and second embodiments, a stator core body having a different inner diameter or a rotor core body having a different outer diameter is used to step the gap between the stator core and the rotor away from the bearing. However, by changing the inner diameter of the stator core body and the outer diameter of the rotor core body, the gap between the stator core and the rotor is increased stepwise in the direction away from the bearing. May be.
In the first and second embodiments, the rotor is constructed by embedding magnets on the outer peripheral side of a cylindrical laminate produced by laminating magnetic steel plates. The rotor may be configured by embedding magnets in the iron core, or the rotor may be configured by arranging magnets on the outer peripheral surface of a cylindrical laminate made of magnetic steel plates or a cylindrical dust core. .

In the first and second embodiments, the stator coil is configured by concentrated winding. However, the stator coil is not limited to concentrated winding, for example, distributed winding. It may be constituted by.
In the first and second embodiments, the number of poles of the rotor and the number of slots of the stator in the rotary motor are not described. However, the ratio of the number of poles to the number of slots is the same as that of a general rotary motor. Yes, for example, 4: 3, 2: 3, etc.

Here, in Embodiments 1 and 2 described above, a rotary motor using a rotor provided with magnets serving as magnetic poles has been described. However, in the present invention, field means for forming magnetic poles on the rotor is fixed. The same effect can be obtained when the present invention is applied to a rotary electric motor disposed in a child, for example, a rotary electric motor such as an induction machine, a switched reluctance motor, or a magnetic inductor type rotary machine.
Hereinafter, a magnetic inductor type rotating machine to which the present invention is applied will be described.

Embodiment 3 FIG.
4 is a partially broken perspective view showing the main configuration of a rotary electric motor according to Embodiment 3 of the present invention, and FIG. 5 is a cross-sectional view schematically showing the main configuration of the rotary electric motor according to Embodiment 3 of the present invention. is there.

  4 and 5, the rotary motor 20 is a magnetic inductor type rotary machine, which is made of a massive magnetic material such as iron and is fixed to the rotary shaft 21 coaxially with the rotary shaft 21 cantilevered by the bearing 10. A stator 22 formed by winding a stator coil 30 as a torque generating drive coil around a stator core 27 disposed so as to surround the rotor 22, and a field magnetomotive force A field coil 31 serving as a generating coil, and a frame 32 that houses the rotor 22, the stator 26, and the field coil 31 are provided.

  The rotor 22 is produced by laminating and integrating a predetermined number of magnetic steel plates and the first and second rotor core bodies 23 and 24 produced by laminating and integrating a large number of magnetic steel plates formed in a predetermined shape, for example. And a disk-shaped partition wall 25 having a rotary shaft insertion hole 25a formed at the axial center position. The first and second rotor core bodies 23 and 24 are formed in the same shape, and cylindrical base portions 23a and 24a each having a rotation shaft insertion hole 23c and 24c drilled at an axial center position, and the base portions 23a and 24a. It is composed of four salient poles 23b, 24b that project radially outward from the outer peripheral surface and extend in the axial direction, and are provided at four equiangular pitches in the circumferential direction. The first and second rotor core bodies 23 and 24 are disposed in close contact with each other via a partition wall 25 with a half salient pole pitch shifted in the circumferential direction, and their rotation shaft insertion holes 23c, 24c and 25a. It is configured to be fixed to the rotating shaft 21 inserted through the shaft. The rotor 22 is rotatably disposed in the frame 32 with one end of the rotating shaft 21 supported by the bearing 10.

  The stator core 27 includes first and second stator core bodies 28 and 29 that are manufactured by laminating and integrating a large number of magnetic steel plates formed in a predetermined shape. The first stator core body 28 includes a cylindrical core back 28a, and teeth 28b that protrude radially inward from the inner peripheral surface of the core back 28a and are provided with six equiangular pitches in the circumferential direction. Is provided. And the slot 28c opened to the inner peripheral side is defined by the core back 28a and the adjacent tooth 28b. The second stator core body 29 includes a cylindrical core back 29a and teeth 29b that are provided radially inwardly from the inner peripheral surface of the core back 29a and provided with six equiangular pitches in the circumferential direction. Is provided. And the slot 29c opened to an inner peripheral side is defined by the core back 29a and the adjacent teeth 29b. The second stator core body 29 is formed in the same shape as the first stator core body 28 except that the length of the teeth 29b is shorter than the length of the teeth 28b. The first and second stator core bodies 28 and 29 are arranged so that the circumferential positions of the teeth 28b and 29b coincide with each other and are spaced apart by the axial thickness d of the partition wall 25, respectively. 23 and 24 are disposed in the frame 32 so as to surround them.

  The stator coil 30 is a three-phase coil wound in a so-called concentrated winding system in which conductor wires are wound around teeth 28b and 29b that are paired in the axial direction without straddling the slots 28c and 29c. Have That is, the stator coil 30 is configured by sequentially winding three phases of U, V, and W twice in a concentrated manner on six pairs of teeth 28b and 29b opposed in the axial direction. In FIG. 4, only a one-phase coil is shown for convenience.

The field coil 31 is a cylindrical coil obtained by winding a conductor wire in a cylindrical shape, and is interposed between the core backs 28 a and 29 a of the first and second stator core bodies 28 and 29.
The frame 32 is made of a massive magnetic material such as iron, and is arranged so as to be in close contact with the outer peripheral surface of the core back 28a of the first stator core body 28 and the outer peripheral surface of the core back 29a of the second stator core body 29. Provided to constitute an axial magnetic path forming member. When the frame 32 is made of a non-magnetic material, members made of a magnetic material such as iron are used as the outer peripheral surface of the core back 28a of the first stator core body 28 and the second stator core body 29. What is necessary is just to arrange | position so that the outer peripheral surface of the core back 29a may be contact | connected.

  Next, the operation of the rotary motor 20 configured as described above will be described.

  As indicated by an arrow B in FIG. 4, the magnetic flux generated by energizing the field coil 31 flows radially inward while gradually shifting in the first stator core body 28 outward in the axial direction. The salient poles 23b of the first rotor core body 23 enter from the teeth 28b through the gaps. The magnetic flux that has entered the first rotor core body 23 flows radially inward through the first rotor core body 23 while gradually shifting toward the partition wall 25 in the axial direction, and flows into the rotation shaft 21. The magnetic flux that has flowed into the rotation shaft 21 flows in the rotation shaft 21 in the axial direction and enters the second rotor core body 24. The magnetic flux that has entered the second rotor core body 24 flows radially outward in the second rotor core body 24 while gradually shifting outward in the axial direction, and the second magnetic flux passes through the gaps from the salient poles 24b. The teeth 29b of the stator core body 29 are entered. The magnetic flux that has entered the second stator core body 29 flows radially outward in the second stator core body 29 while gradually shifting in the axial direction toward the field coil 31, and flows into the frame 32. The magnetic flux flowing into the frame 32 flows in the axial direction through the frame 32 and returns to the first stator core body 28.

  At this time, since the salient poles 23b and 24b of the first and second rotor core bodies 23 and 24 are shifted by a half salient pole pitch in the circumferential direction, when viewed from the axial direction, the magnetic flux includes It acts as if it were alternately arranged in the circumferential direction. A torque is generated by passing an alternating current through the stator coil 30 in accordance with the position of the rotor 22. Thus, the rotary motor 20 is a non-commutator motor, and magnetically operates in the same manner as an 8-pole 6-slot concentrated winding type permanent magnet type rotary machine.

  According to the third embodiment, since the rotor 22 is attached to the end of the rotating shaft 21 that is cantilevered, the rotating shaft 21 is rotationally driven while being inclined with respect to the shaft center of the bearing 10. The However, since the length of the teeth 29b of the second stator core body 29 is shorter than the length of the teeth 28b of the first stator core body 28, the rotor 22 and the stator core 27 opposite to the bearing 10 are formed. Is larger than the gap Gn between the rotor 22 and the stator core 27 on the bearing 10 side, and contact between the rotor 22 and the stator core 27 during driving is avoided.

  Further, a gap d is secured between the first stator core body 28 and the second stator core body 29. Therefore, the magnetic resistance between the first stator core body 28 and the second stator core body 29 is increased, the magnetic flux flowing from the second stator core body 29 to the first stator core body 28 is reduced, and iron Loss is reduced. Further, since the field coil 31 can be disposed in the gap between the first stator core body 28 and the second stator core body 29, the field coil 31 is disposed on the radially outer side of the stator core 27. Therefore, the apparatus can be reduced in size.

Embodiment 4 FIG.
6 is a cross-sectional view schematically showing a main configuration of a rotary electric motor according to Embodiment 4 of the present invention.

In FIG. 6, a permanent magnet 33 as a field magnetomotive force generating magnet is, for example, an anisotropic sintered rare earth magnet made in a flat ring shape, and includes a first stator core body 28 and a second stator core body. 29 is coaxially interposed. The permanent magnet 33 is magnetized and oriented so that the magnetization direction 34 is directed from the second stator core body 29 to the first stator core body 28. The frame 35 is made of a nonmagnetic material such as aluminum and is disposed so as to enclose the stator 26.
The fourth embodiment is the same as the third embodiment except that a permanent magnet 33 is used in place of the field coil 31 and a frame 35 made of a nonmagnetic material is used as the field means. It is configured in the same way.

  In the rotary electric motor 20A configured as described above, the magnetic flux generated by the permanent magnet 33 flows inward in the radial direction while gradually shifting in the first stator core body 28 outward in the axial direction, and passes through the gap from the teeth 28b. Enters the salient pole 23b of the first rotor core body 23. The magnetic flux that has entered the first rotor core body 23 flows radially inward through the first rotor core body 23 while gradually shifting toward the partition wall 25 in the axial direction, and flows into the rotation shaft 21. The magnetic flux that has flowed into the rotation shaft 21 flows in the rotation shaft 21 in the axial direction and enters the second rotor core body 24. The magnetic flux that has entered the second rotor core body 24 flows radially outward in the second rotor core body 24 while gradually shifting outward in the axial direction, and the second magnetic flux passes through the gaps from the salient poles 24b. The teeth 29b of the stator core body 29 are entered. The magnetic flux that has entered the second stator core body 29 flows radially outward while gradually shifting the second stator core body 29 toward the permanent magnet 33, and returns to the permanent magnet 33.

  Then, by passing an alternating current through the stator coil 30 according to the position of the rotor 22, torque is generated, and the rotor 22 is rotationally driven.

  Also in the fourth embodiment, since the length of the teeth 29b of the second stator core body 29 is shorter than the length of the teeth 28b of the first stator core body 28, the rotor on the opposite side to the bearing 10 is formed. The gap Gf between the rotor 22 and the stator core 27 is wider than the gap Gn between the rotor 22 and the stator core 27 on the bearing 10 side, and contact between the rotor 22 and the stator core 27 during driving is avoided. The

  Further, since the gap d is secured between the first stator core body 28 and the second stator core body 29, the magnetic flux flowing from the second stator core body 29 to the first stator core body 28 is reduced. Iron loss is reduced. Furthermore, since the permanent magnet 33 can be disposed in the gap between the first stator core body 28 and the second stator core body 29, the apparatus can be miniaturized. Furthermore, since the frame 35 is made of a nonmagnetic material, a magnetic path is formed that returns from the permanent magnet 33 to the permanent magnet 33 via the first stator core body 28, the frame 35, and the second stator core body 29. In other words, the effective magnetic flux amount is secured and the output can be improved.

In the third and fourth embodiments, the ratio of the number of field poles to the number of slots is 8: 6, that is, the pole slot ratio is 4: 3. However, the pole slot ratio is not limited to 4: 3. For example, it may be 2: 3.
In the third and fourth embodiments, the first and second stator core bodies and the first and second rotor cores are made by laminating magnetic steel plates as magnetic thin plates. The thin plate is not limited to a magnetic steel plate, and for example, an electromagnetic steel plate may be used.
In the third and fourth embodiments, the first and second rotor core bodies and the partition walls are made by laminating magnetic steel plates. However, the first and second rotor core bodies and the partition walls are It may be made of a bulk magnetic material such as a dust core or iron.

In the third and fourth embodiments, the stator coil is configured by concentrated winding. However, the stator coil is not limited to concentrated winding, for example, distributed winding. It may be configured.
In the third and fourth embodiments, the partition wall is interposed between the first and second rotor core bodies, but the first and second rotor core bodies are sufficiently fixed to the rotation shaft. If it is, the partition may be omitted.

  In the third and fourth embodiments, the stator core body having different inner diameters is used to widen the gap between the stator core and the rotor stepwise in the direction away from the bearing. Change both the inner diameter of the rotor core body and the outer diameter of the rotor core body, or change only the outer diameter of the rotor core, and step in the direction away from the bearing between the stator core and the rotor. It may be wide.

  1,1A, 20,20A Rotary motor, 2,22 Rotating shaft, 3,11,22 Rotor, 4,14,26 Stator, 5,15,27 Stator core, 6,16,28 First stator Core body, 7, 17, 29 Second stator core body, 8, 30 Stator coil, 9, 32, 35 frame, 10 bearing, 31 Field coil (field magnetomotive force generating coil), 33 Permanent magnet ( Field magnetomotive force generating magnet).

Claims (5)

Frame,
A rotor attached to a rotating shaft that is cantilevered on the frame via a bearing;
A stator core attached to the frame so as to surround the rotor, and a stator having a stator coil wound around the stator core and generating torque for rotating the rotor,
The gap between the rotor and the stator core is configured to expand stepwise in a direction away from the bearing,
The stator cores have the same number of steps as the number of steps formed by laminating magnetic thin plates, spaced apart from each other at positions between the steps of the gap, and arranged coaxially in the axial direction. Configured ,
A rotary electric motor characterized in that a gap between the stator core bodies arranged in the axial direction is wider than a maximum gap between the rotor and the stator core .   The gap between the rotor and the stator core is configured to change in an inner diameter of the same number of the stator core bodies as the number of steps, and to expand in a stepwise direction away from the bearing. The rotary electric motor according to claim 1, wherein   2. The air gap between the rotor and the stator core is configured to change stepwise in a direction away from the bearing by changing the outer diameter of the rotor. Rotating electric motor. The stator core is composed of two stator core bodies,
4. The rotary electric motor according to claim 1, wherein a field magnetomotive force generating coil is interposed between the stator core bodies arranged in the axial direction. 5. The stator core is composed of two stator core bodies,
The field magnetomotive force generating magnet is magnetized and oriented in the axial direction, and is interposed between the stator core bodies arranged in the axial direction. The rotary electric motor of Claim 1.

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