JP2014241695A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which is multipolarized relatively to the prior arts.SOLUTION: In a rotor 14, a plurality of permanent magnets 44 are provided at intervals along a circumferential direction in such a manner that magnetic poles become alternate. Further, the rotor 14 comprises a bridge part 46 and a sub magnetic pole part 48 between the permanent magnets 44 and 44 neighboring along the circumferential direction. The bridge part 46 disturbs the flow of a magnetic flux, flowing within the rotor 14, from one permanent magnet 44 to the other permanent magnet 44. The sub magnetic pole part 48 opposes a magnetic pole 28A of a stator 12 and leaks the magnetic flux disturbed by the bridge part 46 to the outside of the rotor 14 for interlinkage with the magnetic pole 28A of the stator 12.

Description

  The present invention relates to a rotating electrical machine.

  As a conventional rotating electrical machine, for example, in Patent Document 1, a rotor (rotor) is provided with a permanent magnet. The rotor has an annular (hollow ring) shape, and a plurality of permanent magnets are provided on the inner peripheral surface along the circumferential direction. A first armature is provided in the rotor, and a second armature is provided outside the rotor. While the magnetic pole of the first armature and the permanent magnet of the rotor are electromagnetically coupled, the leakage magnetic flux leaked from the permanent magnet of the rotor to the outside of the rotor via the back yoke of the rotor becomes the second armature. Interlink with the magnetic poles. As a result, the magnetic poles of the second armature and the permanent magnets of the rotor are electromagnetically coupled.

JP 2010-114959 A

  Incidentally, in recent years, there has been an increasing demand for downsizing of rotating electrical machines. It has been conventionally known that downsizing of rotating electrical machines can be realized by increasing the number of poles. Then, an object of this invention is to provide the rotary electric machine which enables the multipolarization of a rotary electric machine compared with the past.

  The present invention relates to a rotating electrical machine. The rotating electrical machine includes a plurality of magnetic poles along a circumferential direction, a stator that generates a rotating magnetic field, and a plurality of permanent magnets that are spaced apart along the circumferential direction so that the magnetic poles are alternately arranged, And a rotor that is rotated according to the rotating magnetic field. The rotor includes a bridge portion between the permanent magnets adjacent to each other in the circumferential direction, the bridge portion blocking the flow of magnetic flux from the one permanent magnet toward the other permanent magnet, and the magnetic pole of the stator. And a secondary magnetic pole portion that leaks the magnetic flux blocked by the bridge portion to the outside of the rotor and interlinks with the magnetic pole of the stator.

  In the above invention, the sub-magnetic pole portion is made of a soft magnetic material, and the bridge portion is a thin-walled portion formed such that the radial thickness of the soft magnetic material is thinner than that of the sub-magnetic pole portion. Is preferably provided.

In the above invention, the circumferential length of the thin portion is formed to be longer than the air gap distance between the auxiliary magnetic pole portion and the magnetic pole of the stator, and the radial thickness L of the thin portion is formed. _BG [m] is the saturation magnetization Js [T] of the thin portion, and among the permanent magnets adjacent to the thin portion along the circumferential direction, the N pole of the permanent magnet facing the inside of the rotor, It is preferable that the film is formed so as to satisfy the formula Js · L _BG <(Br · W _MG ) / 2 using the residual magnetic flux density Br [T] and the magnetic pole width W _MG [m].

  In the above invention, it is preferable that the rotor is provided with a plurality of permanent magnets along the radial direction so that the opposing surfaces have the same polarity.

  In the above invention, a gap or a nonmagnetic material may be provided between the permanent magnet and the sub-magnetic pole portion to prevent magnetic flux from flowing from the sub-magnetic pole portion to the permanent magnet. Is preferred.

  In the above invention, the stator has an annular shape, and the magnetic pole is formed on an inner peripheral surface thereof, and the rotor is disposed in the stator and has an annular shape on an outer peripheral surface thereof. The permanent magnet and the sub magnetic pole portion are formed, and an armature having a magnetic pole formed on an outer peripheral surface thereof is disposed in the rotor, and the magnetic pole of the armature is the permanent magnet of the rotor facing the magnetic pole. It is preferable that the magnetic flux that is excited so as to have the same polarity as the magnetic pole of the armature and flows from the magnetic pole of the armature to the rotor increases the magnetic flux in the rotor.

  In the above invention, the stator has an annular shape, and the magnetic pole is formed on an inner peripheral surface thereof, and the rotor is disposed in the stator and has an annular shape on an outer peripheral surface thereof. The permanent magnet and the sub magnetic pole portion are formed, and an armature having a magnetic pole formed on an outer peripheral surface thereof is disposed in the rotor, and the magnetic pole of the armature is the permanent magnet of the rotor facing the magnetic pole. It is preferable that the magnetic flux excited from the magnetic pole of the armature and flowing from the magnetic pole of the armature to the rotor cancels the magnetic flux in the rotor.

  In the above invention, it is preferable that the bridge portion is provided with a nonmagnetic material over the entire radial direction of the rotor.

  According to the present invention, it is possible to provide a rotating electrical machine having a multi-polarity as compared with the prior art.

It is a figure which illustrates the vehicle carrying the rotary electric machine which concerns on this embodiment. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a figure for demonstrating the shape dimension of a thin part. It is a partial cross section figure of the rotary electric machine which concerns on a prior art. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a figure explaining the interlinkage magnetic flux of a stator. It is a figure explaining the interlinkage magnetic flux of a stator. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment. It is a partial cross section figure which shows another example of the rotary electric machine which concerns on this embodiment.

  FIG. 1 illustrates a rotating electrical machine 10 according to this embodiment. In the embodiment shown in FIG. 1, the rotating electrical machine 10 is used as a drive source for a vehicle. The rotating electrical machine 10 may be a so-called hollow rotor type rotating electrical machine, and includes a stator 12 (stator), a rotor 14 (rotor), and an armature 16. The stator 12 has an annular shape, and the rotor 14 is disposed inside the stator 12 via an air gap. The rotor 14 is also in an annular shape, and a cylindrical armature 16 is disposed inside the rotor 14 via an air gap. Further, the rotor 14 and the armature 16 may be provided with a clutch mechanism 26. By bringing the clutch mechanism 26 into the engaged state, the armature 16 and the rotor 14 are physically coupled.

  FIG. 2 illustrates detailed structures of the stator 12, the rotor 14, and the armature 16. In FIG. 2, a quarter portion of the cross section when the stator 12, the rotor 14, and the armature 16 are cut along a plane perpendicular to the central axis is shown. The remaining 3/4 portions have the same shape.

  The stator 12 generates a rotating magnetic field and rotates the rotor 14. The stator 12 includes a plurality of magnetic poles 28A along the circumferential direction. The stator 12 includes a stator core 30 and a coil 32, and a magnetic pole 28 </ b> A is formed by the coil 32 and the teeth 34 of the stator core 30. The magnetic pole 28 </ b> A is provided so as to face the rotor 14. In FIG. 2, the magnetic pole 28 </ b> A is provided on the inner peripheral surface of the stator 12.

  The magnetic pole 28A is excited so as to generate a rotating magnetic field. For example, as shown in FIG. 1, the stator 12 is supplied with electric power via an inverter 20 from a power storage device 18 including a DC power source such as a battery. A current having a waveform corresponding to a desired rotating magnetic field is supplied to the magnetic pole 28A via the inverter 20, whereby a rotating magnetic field is generated in the magnetic pole 28A.

  Returning to FIG. 2, the armature 16 includes a plurality of magnetic poles 28 </ b> B along the circumferential direction. Similarly to the stator 12, the armature 16 includes a core 36 and a coil 38, and a magnetic pole 28 </ b> B is formed by the coil 38 and the teeth 40 of the core 36. The magnetic pole 28 </ b> B is provided so as to face the rotor 14. In FIG. 2, the magnetic pole 28 </ b> B is provided on the outer peripheral surface of the armature 16.

  The armature 16 may function as a rotor or a stator. In the embodiment shown in FIG. 1, the armature 16 functions as a rotor that transmits the driving force of the engine 24. The armature 16 is connected to power supply means for exciting the magnetic pole 28B. For example, an alternating current is supplied from the power storage device 18 to the armature 16 via the DC / DC converter 19 and the inverter 21. Further, when the armature 16 functions as a rotor, electric power may be supplied to the armature 16 via power supply means such as a slip ring 42.

  The rotor 14 is a rotor that is electromagnetically coupled to the stator 12 and the armature 16 and rotated. For example, in the embodiment shown in FIG. 1, the rotor 14 transmits driving force to the wheels 25 via the transmission 22.

  As shown in FIG. 2, the rotor 14 includes a rotor core 43 and a permanent magnet 44. The rotor core 43 has a function as a magnetic path through which magnetic flux passes. For example, the rotor core 43 is made of a soft magnetic material. Here, the soft magnetic material refers to a magnetic material having a high magnetic permeability and a low coercive force, in other words, magnetized when an external magnetic field is applied, but disappears when the external magnetic field is removed. Specifically, the rotor core 43 is composed of laminated steel plates.

  The permanent magnet 44 may have a flat plate shape, for example, and is disposed such that the opposing surface having the maximum area faces the armature 16 side and the stator 12 side. The permanent magnet 44 is provided so that the magnetic poles are reversed along the radial direction. For example, when the armature 16 side surface is an N pole, the stator 12 side surface is an S pole. A plurality of permanent magnets 44 are provided at intervals along the circumferential direction. At this time, the permanent magnets 44 are provided such that the magnetic poles are alternately arranged along the circumferential direction. For example, the permanent magnet 44 is disposed so that the surface on the armature 16 side is alternately switched between the N pole and the S pole along the circumferential direction.

  Further, the rotor 14 includes a bridge portion 46 and a sub magnetic pole portion 48 between the permanent magnets 44 adjacent in the circumferential direction. As shown in FIG. 3, the bridge portion 46 prevents the flow of magnetic flux in the rotor 14. The flow of magnetic flux from one of the adjacent permanent magnets 44 across the bridge portion 46 toward the other permanent magnet 44 is blocked by the bridge portion 46.

  The bridge portion 46 illustrated in FIGS. 2 and 3 includes a thin portion 50. The thin portion 50 is made of a soft magnetic material. The bridge portion 46 may be a part of the rotor core 43 of the rotor 14, for example. The thin portion 50 is formed so that its radial thickness is thinner than that of the sub magnetic pole portion 48. The magnetic flux flowing in the rotor 14 is magnetically saturated at the thin portion 50 and leaks out of the rotor 14.

  The sub magnetic pole portion 48 leaks the magnetic flux hindered by the bridge portion 46 to the outside of the rotor 14 and links it to the magnetic pole 28 </ b> A of the stator 12. The sub magnetic pole portion 48 may be made of a soft magnetic material and is disposed so as to face the magnetic pole of the stator 12. The sub magnetic pole part 48 may be a part of the rotor core 43.

  In addition, the sub magnetic pole portion 48 may be provided with a gap or a nonmagnetic material between the sub magnetic pole portion 48 and the permanent magnet 44 in order to prevent the magnetic flux from entering the permanent magnet 44.

The shape of the thin portion 50 may be determined according to the characteristics of the sub magnetic pole portion 48 and the permanent magnet 44. FIG. 4 is a schematic diagram for obtaining the shape of the thin portion 50. The circumferential length of the thin portion 50 is W _BG [m], and the radial thickness is L _BG [m]. The air gap distance between the sub magnetic pole portion 48 and the magnetic pole 28A of the stator 12 is L _AG [m]. Furthermore, among the permanent magnets 44A1,44A2,44B1,44B2 adjacent to the thin portion 50 along the circumferential direction, the pole width of the permanent magnet 44A1,44B1 the N pole facing the interior of the rotor 14 and _{W MG.} Here, if the permanent magnet 44 is provided with a plurality of radially, the pole width _{W MG} is the sum of the pole width _{W 2} of each of the permanent magnets 44A1 pole width _{W 1} and the permanent magnets 44B1. Further, the saturation magnetization of the thin portion 50 is represented by Js [T], and the residual magnetic flux density of the permanent magnets 44A1, 44B1 is represented by Br [T].

First, the air gap distance between the thin portion 50 and the magnetic pole 28A of the stator 12 is preferably _{equal to} or greater than the air gap distance LAG between the sub magnetic pole portion 48 and the magnetic pole 28A of the stator 12. Further, the magnetic resistance of the thin portion 50 increases as it approaches saturation magnetization, and increases to the same extent as that of air near saturation magnetization. For this reason, it is preferable that the circumferential length W _BG of the thin portion 50 is longer than the air gap distance L _AG between the sub magnetic pole portion 48 and the magnetic pole 28A of the stator 12 (W _BG > L _AG ). By doing in this way, the magnetic flux which leaked in the thin part 50 is turned to the stator 12 side.

In addition, the range of the thickness L _BG in the radial direction of the thin portion 50 is preferably set to satisfy the following formula (1) in order to sufficiently generate saturation magnetization.

Note that the right-hand side of Equation (1), but has become a half-value of the product of the residual magnetic flux density Br and the magnetic pole width _{W MG} permanent magnet 44A1,44B1, which is the magnetic flux of the permanent magnet 44 flows to the magnet on both sides, The magnetic flux is considered to be halved.

  According to the present embodiment, by providing the bridge portion 46, the magnetic flux in the rotor 14 is saturated, and magnetic flux leakage to the outside of the rotor 14 is promoted. Further, a leakage magnetic flux flows to the stator 12 from the auxiliary magnetic pole portion 48 provided adjacent to the bridge portion 46. Although the sub magnetic pole portion 48 itself is a soft magnetic material, it apparently behaves as a magnetic pole due to the above configuration. As shown in FIGS. 2 and 3, three magnetic poles can be obtained from one permanent magnet 44 by providing two sub-magnetic pole portions 48 and bridge portions 46 on both sides of one permanent magnet 44. . As a result, it is possible to increase the number of rotating electrical machines as compared with the conventional case.

  Further, with the increase in the number of poles, the rotating electrical machine 10 can be reduced in size. FIG. 5 shows a rotating electrical machine that does not have the bridge portion 46 and the auxiliary magnetic pole portion 48 as a comparative example. The magnetic flux interlinking with the magnetic pole 28A of the stator 12 through the air gap from the permanent magnet 44 of the rotor 14 goes around the back yoke 52 of the stator core 30 and goes to the adjacent permanent magnet 44 as it is.

  On the other hand, when the bridge portion 46 and the sub magnetic pole portion 48 are provided as in this embodiment, as shown in FIG. 6, a part of the magnetic flux interlinked with the magnetic pole 28A of the stator 12 remains as it is. The magnetic flux that flows back to the side 48 and turns to the back yoke 52 is reduced accordingly. Since the magnetic flux flowing through the back yoke 52 is reduced, the back yoke 52 can be thinned, leading to a reduction in the size of the rotating electrical machine. Further, since the number of permanent magnets 44 does not change between FIG. 5 and FIG. 6, and basically the output torque does not change between the example of FIG. 5 and the example of FIG. 6, it is possible to reduce the size while maintaining the output torque. It becomes possible. In other words, the torque density per unit volume / weight can be improved.

  FIG. 7 shows another example of the rotating electrical machine 10 according to the present embodiment. The rotor 14 is provided with a plurality of permanent magnets 44A and 44B along its radial direction. The permanent magnets 44A and 44B are provided so that the opposing surfaces have the same polarity.

  By providing such a configuration, the interlinkage magnetic flux to the stator 12 can be effectively increased. FIG. 8 is a schematic diagram illustrating the principle. The upper part of the figure shows an example in which only the permanent magnet 44 </ b> A on the stator 12 side is provided on the rotor 14 (hereinafter referred to as a single arrangement on the stator side). In this example, a part (one in the figure) of the magnetic flux from the permanent magnet 44A flows to the adjacent permanent magnet 44A via the bridge portion 46, and the remaining part due to the magnetic saturation of the bridge portion 46. (One in the figure) leaks from the sub magnetic pole part 48 and is linked to the stator 12.

  The middle part of the figure shows an example in which only the permanent magnet 44B on the armature 16 side is provided on the rotor 14 (hereinafter referred to as armature side single arrangement). In this example, a part (one in the figure) of the magnetic flux from the permanent magnet 44B flows to the adjacent permanent magnet 44B via the bridge portion 46, and the other part (one in the figure) is the sub magnetic pole part. It leaks from 48 and interlinks with the stator 12.

  In the lower part of the figure, an example in which both permanent magnets 44A and 44B are provided (hereinafter referred to as double-sided arrangement) is shown. The magnetic flux flowing through the bridge portion 46 is not different from the upper and middle examples (one in the figure), but the magnetic flux from the sub magnetic pole portion 48 to the stator 12 is greater than the sum (two) of the upper and middle stages. (3 in the figure). In other words, in the present embodiment, more interlinkage magnetic flux can be obtained than the sum in the case where the individual permanent magnets 44 are provided.

  FIG. 9 shows the result of simulation for each example of FIG. The horizontal axis represents the electrical angle, and the vertical axis represents the flux linkage to the stator 12. Compared with the interlinkage magnetic flux of the stator side single arrangement and the interlinkage magnetic flux of the armature side single arrangement, the interlinkage magnetic flux of both sides is greatly increased. Further, the interlinkage magnetic flux arranged on both sides is larger than the simple sum of the interlinkage magnetic flux arranged independently on the stator side and the interlinkage magnetic flux arranged on the armature side alone.

  As a reference example, FIG. 10 shows an example in which the opposing magnetic poles of the permanent magnets 44A and 44B are different polarities. In this case, since the magnetic flux converges between the opposing magnetic poles, the interlinkage magnetic flux arranged on both sides is lower than the simple sum of the interlinkage magnetic flux arranged on the stator side alone and the interlinkage magnetic flux arranged on the armature side alone. .

  Further, the interlinkage magnetic flux to the stator 12 may be adjusted using the magnetic flux of the magnetic pole 28 </ b> B of the armature 16. FIG. 11 shows a schematic diagram thereof. In the upper stage, as in FIG. 8, an example of a single arrangement on the stator side is shown. In the middle stage, an example in which the magnetic flux by the magnetic pole 28B of the armature 16 is linked to the rotor 14 is shown. Further, in the lower part, an example in which both cases are combined is shown. As shown in the lower example, the magnetic flux in the rotor 14 is excited by exciting the magnetic pole 28B so that the magnetic pole 28B of the armature 16 has the same polarity as the magnetic pole of the permanent magnet 44A of the rotor 14 opposed thereto. As a result, the flux linkage to the stator 12 can be increased.

  Further, as shown in the lower part of FIG. 12, by exciting the magnetic pole 28B so that the magnetic pole 28B of the armature 16 is different from the magnetic pole of the permanent magnet 44A of the rotor 14 opposed thereto, The magnetic flux is canceled out, and as a result, the interlinkage magnetic flux to the stator 12 can be reduced.

  Thus, the magnetic flux in the rotor 14 can be increased or decreased by utilizing the fact that the field of the armature 16 is variable. That is, the electromagnetic coupling force between the rotor 14 and the stator 12 can be controlled, and can be used for torque control of the rotating electrical machine 10 or the like.

FIG. 13 shows another example of the rotating electrical machine 10 according to the present embodiment. Here, the sub magnetic pole part 48 and the thin part 50 are provided on the armature 16 side. Even with this configuration, the circumferential length W _BG of the thin wall portion 50 is longer than the air gap distance L _AG between the sub magnetic pole portion 48 and the magnetic pole 28A of the stator 12 (W _BG > L _AG ), By forming the thin portion 50 within a range that satisfies the above mathematical formula (1), it is possible to secure a crossing magnetic flux from the sub magnetic pole portion 48 to the stator 12.

  Further, as the rotor 14 becomes multipolar, the rotating magnetic field shifts to the high frequency side. In other words, if an attempt is made to output the same rotational speed as that of the rotor 14 before multipolarization, the frequency of the rotating magnetic field increases as the number of magnetic poles increases. As the frequency increases, it becomes difficult to control the speed of the rotating electrical machine, or the motor loss may increase. Therefore, when it is desired to rotate the armature 16 at a relatively low number of revolutions, it is preferable to adopt the configuration shown in FIG.

FIG. 14 shows still another example of the rotating electrical machine 10 according to the present embodiment. Here, the bridge portion 46 is provided with a nonmagnetic material 54 along the entire radial direction of the rotor 14. The nonmagnetic material is made of, for example, an aluminum alloy. The circumferential length W _BG of the nonmagnetic material 54 is preferably longer than the air gap distance L _AG between the sub magnetic pole portion 48 and the magnetic pole 28A of the stator 12 (W _BG > L _AG ).

  FIG. 15 shows still another example of the rotating electrical machine 10 according to the present embodiment. Here, an example in which a gap or a nonmagnetic material between the permanent magnet 44 and the sub magnetic pole portion 48 is omitted is shown. In this case, a part of the magnetic flux of the sub magnetic pole part 48 goes around to the permanent magnet 44, and the crossing magnetic flux to the stator 12 is reduced accordingly, but the permanent magnet 44 is securely fixed by the rotor core 43 without a gap. Therefore, the advantage that the strength is increased can be obtained.

  FIG. 16 shows another example of the rotating electrical machine 10 according to the present embodiment. Here, a so-called IPM structure in which the permanent magnets 44A and 44B are embedded in the rotor core 43 is adopted. Since the permanent magnet is embedded in the rotor core 43, there is an advantage that the permanent magnet 44 is not likely to be separated from the rotor core 43 due to the centrifugal force of the rotor 14.

  Further, as shown in FIG. 17, the thin portion 50 may be formed also on the armature 16 side. By doing in this way, the advantage that the mechanical strength of the rotor core 43 improves is acquired.

  Further, in the present embodiment, as the rotating electrical machine 10, a so-called hollow rotor type rotating electrical machine including the stator 12, the rotor 14, and the armature 16 is illustrated, but the rotating electrical machine 10 is not limited to this example. For example, as shown in FIG. 18, a rotating electrical machine 10 including an annular stator 12 and a cylindrical rotor 14 may be used. In this case, the bridge portion 46 may have a gap between the thin portion 50 and the central shaft shaft 56 or may be provided with a nonmagnetic material 58.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Stator, 14 Rotor, 16 Armature, 28A Stator magnetic pole, 28B Armature magnetic pole, 30 Stator core, 36 Armature core, 43 Rotor core, 44 Permanent magnet, 46 Bridge part, 48 Sub magnetic pole part, 50 Thin part , 52 Back yoke, 54 Non-magnetic material.

Claims (8)

A stator having a plurality of magnetic poles along the circumferential direction and generating a rotating magnetic field;
A plurality of permanent magnets are provided so that magnetic poles are alternately arranged at intervals along the circumferential direction, and a rotor that is rotated according to the rotating magnetic field;
With
The rotor is between permanent magnets adjacent along the circumferential direction,
A bridge portion that blocks the flow of magnetic flux flowing from one of the permanent magnets to the other permanent magnet flowing in the rotor;
A secondary magnetic pole portion facing the magnetic pole of the stator and leaking the magnetic flux blocked by the bridge portion to the outside of the rotor and interlinking with the magnetic pole of the stator;
A rotating electric machine comprising: The rotating electrical machine according to claim 1,
The sub magnetic pole part is made of a soft magnetic material,
The rotating electrical machine according to claim 1, wherein the bridge portion includes a thin portion formed so that a radial thickness of the soft magnetic material is thinner than that of the sub magnetic pole portion. A rotating electric machine according to claim 2,
The circumferential length of the thin wall portion is formed to be longer than the air gap distance between the sub magnetic pole portion and the stator magnetic pole,
The thickness L _BG [m] in the radial direction of the thin-walled portion is the saturation magnetization Js [T] of the thin-walled portion, and among the permanent magnets adjacent to the thin-walled portion along the circumferential direction, The permanent magnet facing the inside of the rotor is formed so as to satisfy the formula Js · L _BG <(Br · W _MG ) / 2 using the residual magnetic flux density Br [T] and the magnetic pole width W _MG [m]. A rotating electric machine characterized by the above. The rotating electrical machine according to any one of claims 1 to 3,
The rotating electric machine according to claim 1, wherein the rotor is provided with a plurality of permanent magnets along the radial direction so that the opposing surfaces have the same polarity. The rotating electrical machine according to any one of claims 1 to 4,
A rotating electrical machine is provided between the permanent magnet and the sub-magnetic pole portion, wherein a gap or a non-magnetic material is provided to prevent a magnetic flux from flowing from the sub-magnetic pole portion to the permanent magnet. . The rotating electrical machine according to any one of claims 1 to 5,
The stator has an annular shape, and the magnetic pole is formed on the inner peripheral surface thereof.
The rotor is disposed in the stator and has an annular shape, and the permanent magnet and the sub magnetic pole portion are formed on the outer peripheral surface thereof.
In the rotor, an armature having a magnetic pole formed on its outer peripheral surface is disposed,
The magnetic pole of the armature is excited to be the same as the magnetic pole of the permanent magnet of the rotor facing the magnetic pole, and the magnetic flux flowing from the magnetic pole of the armature to the rotor increases the magnetic flux in the rotor. A rotating electric machine characterized by the above. The rotating electrical machine according to any one of claims 1 to 5,
The stator has an annular shape, and the magnetic pole is formed on the inner peripheral surface thereof.
The rotor is disposed in the stator and has an annular shape, and the permanent magnet and the sub magnetic pole portion are formed on the outer peripheral surface thereof.
In the rotor, an armature having a magnetic pole formed on its outer peripheral surface is disposed,
The magnetic pole of the armature is excited so as to be different from the magnetic pole of the permanent magnet of the rotor facing the magnetic pole, and the magnetic flux flowing from the magnetic pole of the armature to the rotor cancels out the magnetic flux in the rotor. Rotating electric machine. The rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the bridge portion is provided with a nonmagnetic material over the entire radial direction of the rotor.

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