JP2010045919A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of field weakening and field strengthening control, suppressing vibration of rotation of a rotor and suppressing magnetic saturation in a rotor core. <P>SOLUTION: The rotary electric machine includes the rotor core 43, wherein air gaps 47 positioned at intervals inside the diameter direction of the rotor core 43 for magnets 44 are formed on the rotor core 43, and a magnetic flux path 48 allowing a magnetic flux from the magnets 44 to flow is formed between the magnets 44 and each air gap 47. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, various rotating electrical machines have been proposed. For example, a permanent magnet motor described in Japanese Patent Application Laid-Open No. 2005-65385 includes a rotating shaft disposed along a central axis, a core extending in parallel to the central axis in the vicinity of the rotating shaft, and a central axial direction An N-pole magnetic pole extending from one end to a position facing the stator magnetic pole and an S-pole magnetic pole extending from the other end in the central axis direction of the core to a position facing the stator magnetic pole are provided. Further, the permanent magnet type motor includes a field winding wound between one end and the other end of the core, and a position sandwiched between the N-pole magnetic pole and the S-pole magnetic pole as viewed in the central axis direction. And a cylindrical permanent magnet arranged at a position facing the.

In addition, a rotary electric motor described in Japanese Patent Application Laid-Open No. 2008-43099 includes a rotatable rotary shaft, a cylindrical stator core, a rotor core fixed to the rotary shaft, and a set of magnetic poles having different magnetic properties. However, by forming a magnetic circuit between the magnet set on the rotor core so as to be aligned in the radial direction of the rotor core, the magnetic yoke provided on the outer periphery of the stator core, and the magnetic yoke and the rotor core, the rotor core and the stator core And a winding capable of controlling the magnetic flux density therebetween.
JP 2005-65385 A JP 2008-43099 A

  However, in the permanent magnet type motor described in Japanese Patent Laid-Open No. 2005-65385, the amount of magnetic flux supplied to the core is adjusted by a winding provided on the rotor. For this reason, when the rotor rotates at a high speed, the windings slightly shift, which causes problems such as vibrations in the rotor.

  In the rotary electric motor described in Japanese Patent Application Laid-Open No. 2008-43099, magnetic saturation is likely to occur because the magnetic flux from the stator coil and the magnetic flux from the magnet are combined.

  The present invention has been made in view of the above-described problems, and an object of the present invention is a rotating electrical machine capable of field-weakening and field-intensity control, in which the vibration of the rotation of the rotor is suppressed, and the rotor core It is an object of the present invention to provide a rotating electrical machine in which magnetic saturation is suppressed.

  A rotating electrical machine according to the present invention is fixed to a rotating shaft provided rotatably around a rotation axis, a stator core formed in an annular shape and a stator coil wound around the stator core, and the rotating shaft. A rotor core inserted into the stator, and a rotor including a magnet embedded in the rotor core so that the magnetic poles are aligned in the radial direction of the rotor core; a field yoke provided on the outer periphery of the stator core; and a field yoke and a rotor By forming a magnetic circuit between them, a winding capable of controlling the amount of magnetic flux between the rotor core and the stator core is provided. The rotor core is formed with a gap that is spaced from the magnet on the radially inner side of the rotor core, and a magnetic flux passage for magnet through which the magnetic flux from the magnet flows between the magnet and the gap. Is formed. Preferably, the gap portion extends along the edge of the magnet.

  Preferably, a plurality of the magnets are formed at intervals in the circumferential direction of the rotor core, and the gap portions are respectively provided on the radially inner side of the rotor core with respect to each magnet, and the gap portions are arranged in the circumferential direction of the rotor core. The stator coil magnetic flux passage through which the magnetic flux generated by supplying current to the stator coil flows is defined in a portion of the rotor core located between the gaps. Preferably, the gap is formed wider than the magnet magnetic flux path.

  According to the rotating electrical machine of the present invention, it is possible to provide a rotating electrical machine capable of suppressing vibrations generated in the rotor, performing field weakening and field strengthening control, and suppressing magnetic saturation in the rotor core. It is to be.

A rotating electrical machine according to the present embodiment will be described with reference to FIGS.
Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

  In the following embodiment, an example in which the present invention is applied to a motor generator (rotary electric machine) mounted on a hybrid vehicle will be described with reference to the drawings. Various vehicles other than the hybrid vehicle (for example, a fuel cell vehicle and an electric vehicle) The present invention can also be applied to rotating electrical machines mounted on various devices such as electric vehicles including automobiles, industrial equipment, air conditioning equipment, and environmental equipment.

  FIG. 1 is a side sectional view of the rotating electrical machine 10 according to the first embodiment, and FIG. 2 is a sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, the rotating electrical machine 10 is provided on a rotating shaft 41, a rotor 40 fixed to the rotating shaft 41, an annular stator 30, and an outer periphery of the stator 30. Field yoke 21 and field coils 50 and 51.

  An air gap GP is provided between the rotor (rotor) 40 and the stator (stator) 30, and the rotor 40 and the stator 30 are arranged so as to be slightly separated from each other in the radial direction. Yes. The stator 30 is formed in a hollow cylindrical shape, and is configured by laminating a plurality of electromagnetic steel plates. In the stator 30, the rotor 40 and the rotation shaft 41 are disposed so as to be rotatable about the rotation axis O.

  The rotor 40 includes a rotor core 43 fixed to the rotary shaft 41 and a magnet 44 embedded in the rotor core 43.

  The rotor core 43 includes a laminated rotor core 43a formed in a cylindrical shape, and a dust rotor core 43b provided on the inner periphery of the laminated rotor core 43a.

  The dust rotor core 43b is made of an integral magnetic material, specifically, a powder-molded magnetic body (SMC: Soft Magnetic Composites).

  The laminated rotor core 43a is configured by laminating a plurality of electromagnetic steel plates. Since there is a gap between the steel plates, the axial magnetic resistance is larger than the radial and circumferential magnetic resistance. For this reason, in the lamination | stacking rotor core 43a, the magnetic force line from a magnet is hard to flow to an axial direction, and it is easy to flow to radial direction and the circumferential direction.

  Since the dust rotor core 43b is composed of a powder-molded magnetic body, the axial magnetic resistance of the dust rotor core 43b is smaller than the axial magnetic resistance of the laminated rotor core 43a. For this reason, lines of magnetic force are more likely to flow in the axial direction in the dust rotor core 43b than in the laminated rotor core 43a. The field yoke 21 is formed in a hollow cylindrical shape and accommodates the stator 30 and the rotor 40. The field yoke 21 is formed in a cylindrical shape, and includes a side wall portion 21b mounted on the outer peripheral surface of the stator 30, and a top plate portion 21a formed at both ends of the side wall portion 21b. A through hole 21d is formed at the center of the top plate portion 21a, and a protruding portion 21c that defines the through hole 21d is formed on the inner surface side of the top plate portion 21a. A rotation shaft 41 is rotatably fitted in the through hole 21d via a bearing 46.

  The protruding portion 21c is formed in an annular shape and protrudes toward the axial end surface of the dust rotor core 43b. Field coils 50 and 51 are wound around the outer peripheral surface of the protruding portion 21c. And by supplying an electric current to the field coils 50 and 51, the magnetic flux which generate | occur | produced the magnetic flux can distribute | circulate between the protrusion part 21c and the dust rotor core 43b.

  As shown in FIG. 2, the laminated rotor core 43 a has a plurality of magnet pairs 42 arranged at intervals in the circumferential direction of the rotor 40. The magnet pair 42 is disposed such that the surface located on the outer peripheral side of the rotor 40 is an S pole and the radially inner surface of the rotor 40 is an N pole. Furthermore, a gap 47 is formed in the laminated rotor core 43a so as to be spaced from the magnet pair 42 (magnet 44) on the radially inner side of the rotor core 43.

  The stator 30 includes a stator core 22 formed by laminating a plurality of electromagnetic steel plates, and a stator coil 35 wound around the stator core 22 and shown in FIG. A plurality of stator teeth 23 formed at intervals in the circumferential direction and slots positioned between the stator teeth 23 are formed on the inner peripheral surface of the stator core 22. A stator coil 35 is wound around the stator teeth 23.

  1 receives a torque command value to be output from the rotating electrical machine 10 from an ECU (Electrical Control Unit) provided outside the rotating electrical machine 10, and is designated by the received torque command value. A motor control current for outputting the obtained torque is generated, and the generated motor control current is supplied to the stator coil 35 via a three-phase cable. Thus, the rotor 40 rotates by supplying the current to the stator coil 35. FIG. 3 is a cross-sectional view showing details of the magnet pair 42 and the surrounding configuration. In the state shown in FIG. 3, no current is supplied to the field coils 50 and 51, and so-called strong field control and weak field control are not performed.

  As shown in FIGS. 3 and 2, the magnet pair 42 includes two magnets 44 </ b> A and 44 </ b> B arranged in the circumferential direction of the rotor core 43. The magnets 44 </ b> A and 44 </ b> B are arranged in a V shape, and are accommodated in magnet accommodation holes formed in the rotor core 43, respectively. The gap 47 is gradually bent along the radially outward side of the rotor core 43 from the portion located in the circumferential center of the magnet pair 42 toward the circumferential end of the magnet pair 42. The gap 47 extends along the outer peripheral edge on the radially inner side of the magnet pair 42.

  A magnetic flux path portion 48 is formed in a portion of the laminated rotor core 43 a located between the magnets 44 </ b> A and 44 </ b> B and the gap portion 47. The magnetic flux path portion 48 is formed in a portion adjacent to the magnet 44A, 44B on the radially inner side of the rotor core 43. The radial width of the magnetic flux path portion 48 is smaller than the radial width of the gap portion 47.

  This magnetic flux path portion 48 is radially inward from a portion located radially inward with respect to a portion located in the central portion of the magnet pair 42 in the circumferential direction, and radially inward relative to a portion located at the circumferential end portion of the magnet pair 42 It extends so as to reach the peripheral edge of the rotor core 43 through a portion adjacent to the side.

  Here, as shown in FIG. 2, the rotor core 43 is provided with a plurality of magnet pairs 42 at intervals in the circumferential direction of the rotor core 43, and the rotor core 43 has a diameter with respect to each magnet pair 42. A gap 47 is formed in a portion located on the inner side in the direction. And the magnetic flux path part 45 which reaches the outer peripheral part of the lamination | stacking rotor core 43a from the outer peripheral part of the compacting rotor core 43b is formed in the part located between the adjacent rotor cores 43 among the rotor cores 43. The magnetic flux path portion 45 is defined by the gap portion 47 so as to become narrower from the outer peripheral edge portion of the dust rotor core 43b toward the outer peripheral edge portion of the laminated rotor core 43a.

  In FIG. 3, magnetic fluxes MF <b> 10 to MF <b> 12 are radiated from the radially inner surface of the surface of the magnet 44 </ b> A and enter the magnetic flux path portion 48. Since a gap 47 is formed in a portion located on the side opposite to the magnet 44A with respect to the magnetic flux path 48, the magnetic fluxes MF10 to MF12 from the magnet 44A exceed the gap 47, and the dust rotor core 43b Intrusion is suppressed.

  For this reason, most of the magnetic fluxes MF10 and MF11 out of the magnetic fluxes MF10 to MF12 radiated from the magnet 44A pass through the magnetic flux path portion 48. A part of the magnetic flux MF12 out of the magnetic flux MF10 to the magnetic flux MF12 radiated from the magnet 44A enters the dust rotor core 43b beyond the gap 47.

  The magnetic fluxes MF10 and MF11 reach the end surface of the stator teeth 23A from the outer peripheral edge of the laminated rotor core 43a over the air gap GP.

  In the example shown in FIG. 3, a current is supplied to the coil 24 so that the end face of the stator teeth 23B is an N magnetic pole and the end face of the stator teeth 23E is an S magnetic pole.

  Thereby, the magnetic fluxes MF10 and MF11 entering the stator core 22 from the stator teeth 23A enter the stator teeth 23B and enter the rotor core 43 from the end face of the stator teeth 23B.

  On the other hand, the magnetic flux MF13 advances in the axial direction of the rotor core 43 in the dust rotor core 43b. And in FIG. 1, it penetrates in the protrusion part 21c from the axial direction edge part of the dust rotor core 43b. Thereafter, the magnetic flux MF12 enters the side wall portion 21b from the top plate portion 21a of the field yoke 21, and then enters the laminated rotor core 43a. Then, the stator teeth 23B return to the magnet 44A.

  Here, the stator teeth 23A are located on the front side in the rotational direction P with respect to the end of the magnetic flux path portion 48 from which the magnetic flux MF10 and the like are radiated. Further, the center portion in the width direction of the stator teeth 23B is located on the front side in the rotational direction P with respect to the center portion in the circumferential direction of the magnet 44A.

  For this reason, torque in the rotational direction P is applied to the rotor core 43 so that the path length of the magnetic circuit defined by the magnetic fluxes MF10 to M13 is shortened as described above.

  The magnet 44B is located on the rear side in the rotation direction P with respect to the magnet 44A. Magnetic fluxes MF13 to MF14 are radiated from the surface on the N-pole side of the magnet 44B and enter the magnetic flux path portion 48.

  Of the magnetic fluxes MF13 to MF15 radiated from the magnet 44B, most of the magnetic fluxes MF14 and MF15 travel through the magnetic flux path portion 48 and enter the stator teeth 23E from the end of the magnetic flux path portion 48 on the magnet 44B side. Then, it enters the laminated rotor core 43a from the end face of the stator teeth 23C via the air gap GP, and returns to the magnet 44B.

  On the other hand, a part of the magnetic flux MF13 from the magnet 44B enters the dust rotor core 43b beyond the gap 47. And it advances to the axial direction of the dust rotor core 43b, and enters the protrusion 21c from the axial end of the dust rotor core 43b. Thereafter, it passes through the field yoke 21, enters the laminated rotor core 43a from the stator teeth 23B, and returns to the magnet 44B.

  At this time, the central portion in the width direction of the magnet 44B is located on the rear side in the rotational direction P with respect to the central portion in the width direction of the stator teeth 23C and 23B. For this reason, torque in the rotational direction P is applied to the rotor core 43 so that the path length of the magnetic circuit defined by the magnetic fluxes MF13 to MF15 is shortened.

  Here, the magnetic fluxes MF12 and MF13 pass once between the rotor 40 and the stator 30, while the other magnetic flux passes twice. For this reason, the torque generated by the magnetic fluxes MF12 and MF13 is smaller than the magnetic flux generated by other magnetic fluxes.

  On the other hand, in the rotating electrical machine 10 according to the present embodiment, by arranging the gap 47 between the magnets 44A and 44B and the dust rotor core 43b, the dust rotor core as in the magnetic fluxes MF12 and MF13 and the like. The magnetic flux toward 43b can be reduced. Thereby, the magnetic saturation of the rotor core 48a is alleviated and the torque of the rotating electrical machine 10 can be increased. In particular, since the radial width of the rotor core 43 in the gap 47 is larger than the radial width of the magnetic flux path 48, the amount of magnetic flux exceeding the gap 47 can be reduced.

  Further, since the gap 47 is located between the magnets 44A and 44B and the dust rotor core 43b and extends along the magnets 44A and 44B, the magnetic flux radiated from the magnets 44A and 44B is reduced by the dust. Reaching the rotor core 43b can be suppressed satisfactorily. Here, an electric current is supplied to the coil 24 so that the end face of the stator teeth 23E becomes the S magnetic pole. Magnetic fluxes MF20 and MF21 are generated by exciting the end face of the stator teeth 23 to the S magnetic pole.

  The magnetic fluxes MF20 and MF21 pass through the stator teeth 23E and enter the magnetic flux path portion 45 from the stator teeth 23E via the air gap GP. Thereafter, the magnetic flux path portion 45 passes in the rotation direction P, passes through the air gap GP from the radial end face of the magnetic flux path portion 45, and enters the stator teeth 23E.

  Here, the central portion in the width direction of the stator teeth 23 </ b> E is located on the front side in the rotational direction P with respect to the central portion in the width direction of the magnetic flux path portion 45. For this reason, the reluctance torque which goes to the rotation direction P arises in the rotor core 43 so that the path length of the magnetic circuit prescribed | regulated by said magnetic flux MF20, MF21 may become short.

  Here, the magnetic fluxes MF14 to MF15 from the magnet 44B pass through the magnetic flux path portion 48 formed between the gap portion 47 and the magnet 44B, while the magnetic fluxes MF20 and MF21 that generate the reluctance torque are applied to the rotor core 43. Among these, it passes through the magnetic flux path portion 45 located on the opposite side of the magnetic flux path portion 48 with respect to the gap portion 47.

  For this reason, the magnetic fluxes MF14 and MF15 from the magnet 44B and the magnetic fluxes MF20 and MF21 generated by supplying a current to the coil 24 are separated, and the flow regions are separated by the gap 47.

  For this reason, in the rotor core 43, it can suppress that the part which magnetic flux density becomes high too much can be suppressed, and it can suppress that a magnetic flux is saturated. Along with this, torque that rotates the rotor core 43 in the rotation direction P can be generated by each magnetic flux.

  FIG. 4 is a sectional side view of the rotating electrical machine 10 during the strong field control, and FIG. 5 is a sectional view during the strong field control. As shown in FIG. 4, the magnetic circuit K <b> 1 is formed by supplying current to the field coils 50 and 51. The magnetic fluxes MF50 and MF51 passing through the magnetic flux circuit K1 first enter the end surface in the axial direction of the dust rotor core 43b from the protruding portion 21c. Then, the powder rotor core 43b is advanced in the axial direction. Then, it enters the laminated rotor core 43a. Here, since the dust rotor core 43b is configured by a dust core, the magnetic resistance in the axial direction and the radial direction is reduced. Therefore, the magnetic fluxes MF50 and MF51 are axial and radial in the dust rotor core 43b. It is possible to circulate well. Then, when the magnetic fluxes MF50 and MF51 enter the laminated rotor core 43a, the magnetic fluxes MF50 and MF51 advance along the main surface of the electrical steel sheet constituting the laminated rotor core 43a. Thereafter, the magnetic fluxes MF50 and MF51 pass through the air gap GP from the outer peripheral edge of the rotor 40 and reach the inner peripheral surface of the stator 30.

  Here, since the laminated rotor core 43a and the stator 30 are configured by laminating a plurality of electromagnetic steel plates, the magnetic fluxes MF50 and MF51 are along the main surfaces of the electromagnetic steel plates constituting the laminated rotor core 43a and the stator 30. It is easy to advance, and it is difficult to advance in the axial direction of the laminated rotor core 43 a and the stator 30.

  The magnetic fluxes MF50 and MF51 reaching the stator 30 travel along the main surface of the electromagnetic steel plate constituting the stator 30, and enter the field yoke 21 from the outer peripheral edge of the stator 30. Then, it returns to the protrusion part 21c through the side wall part 21b and the top plate part 21a.

  As shown in FIG. 5, during the strong field, the magnetic fluxes MF50 and MF51 reach the field yoke 21 from the dust rotor core 43b through the laminated rotor core 43a, the air gap GP, and the stator core 22.

  For this reason, the outer peripheral surface of the dust rotor core 43b has a property as an N pole, and the inner peripheral surface of the field yoke 21 has a property as an S pole.

  Here, as shown in FIG. 3, in the state where no current is supplied to the field coils 50 and 51, some of the magnetic fluxes MF12 and MF13 out of the magnetic fluxes from the magnets 44 </ b> A and 44 </ b> B have the gap 47. And reaches the dust rotor core 43b.

  However, as shown in FIG. 5 described above, the surface of the dust rotor core 43b has a property as an N pole, so that the magnetic fluxes MF12 and MF13 are suppressed from reaching the dust rotor core 43b.

  For this reason, these magnetic fluxes MF12 and MF13 also flow so as to reach the stator core 22 through the magnetic flux path 48 and the air gap GP in the same manner as the magnetic fluxes MF10, MF11, MF14, and MF15. Thereafter, each magnetic flux enters the laminated rotor core 43a from each stator tooth via the air gap GP.

  Thereby, the amount of magnetic flux passing between the stator 30 and the rotor 40 through the air gap GP can be improved as compared with the state shown in FIG. 3, and the torque of the rotating electrical machine 10 can be increased. it can.

  Further, by adding the magnetic fluxes MF50 and MF51, the amount of magnetic flux passing between the stator 30 and the rotor 40 can be further improved through the air gap GP, and the generated torque can be improved. Thereby, for example, a large torque can be obtained even at a low rotation speed.

  FIG. 6 is a sectional side view of the rotating electrical machine 10 during field weakening control. As shown in FIG. 6, by supplying a current to the field coils 50 and 51, a magnetic flux circuit K2 is formed by the magnetic flux MF50 and the magnetic flux MF51.

  Magnetic fluxes MF50 and MF51 passing through the magnetic flux circuit K2 enter the stator 30 from the outer peripheral surface of the stator 30 through the top portion 21a and the side wall portion 21b from the protruding portion 21c. The magnetic fluxes MF50 and MF51 travel toward the inner peripheral surface of the stator 30 along the main surface of the electromagnetic steel sheet constituting the stator 30. Then, it enters the laminated rotor core 43a of the rotor 40 from the inner peripheral surface of the stator 30 through the air gap GP. The magnetic fluxes MF50 and MF51 entering the rotor 40 then enter the dust rotor core 43b, proceed in the axial direction of the dust rotor core 43b, and enter the protruding portion 21c from the axial end surface of the dust rotor core 43b.

  FIG. 7 is a cross-sectional view of the rotating electrical machine 10 during field weakening control shown in FIG. As shown in FIG. 7, the magnetic fluxes MF50 and MF51 travel from the field yoke 21 to the dust rotor core 43b via the stator core 22, the air gap GP, and the laminated rotor core 43a.

  For this reason, the inner peripheral surface of the field yoke 21 has a property as an N pole, and the outer peripheral surface of the dust rotor core 43b has a property as an S pole.

  As a result, among the magnetic fluxes MF10 to MF15 from the magnets 44A and 44B, many of the magnetic fluxes MF11 to MF14 are attracted to the dust rotor core 43b, pass through the gap 47, and reach the dust rotor core 43b.

  Then, the magnetic fluxes MF11 to MF14 advance in the dust rotor core 43b in the axial direction, and reach the protruding portion 21c from the axial end of the dust rotor core 43b. Thereafter, it enters the stator core 22 through the top plate portions 21a and 21b, and enters the laminated rotor core 43a from each stator tooth through the air gap GP.

  In this way, a large amount of magnetic flux enters the dust rotor core 43b, whereby the amount of magnetic flux passing between the stator 30 and the rotor 40 can be reduced. The amount of magnetic flux traversing the coil wound around the stator core 22 can be reduced, and the counter electromotive force generated in the coil wound around the stator core 22 can be reduced.

  And it becomes possible to supply an electric current to a coil by reducing the counter electromotive force generated in the coil wound around the stator core 22. Thereby, even when the rotor 40 is rotating at a high speed, it is possible to supply a current to the stator coil, and further, the rotor 40 can be rotated at a high speed.

  As described above, according to the rotating electrical machine 10 according to the present embodiment, the field-weakening control and the field-strengthening control can be performed, and high torque can be ensured at low rotation and the rotor 40 can be rotated at high speed with low torque. it can.

  In addition, FIG. 8 is sectional drawing which shows the magnetic flux density of the conventional rotary electric machine. In FIG. 8, the region M1 has the highest magnetic flux density, and the magnetic flux density decreases from the region M1 toward the region M4. As shown in FIG. 8, in the conventional rotating electrical machine, it can be seen that the magnetic flux density is high in the portion of the rotor core located on the side of the permanent magnet. And in the said area | region, the magnetic flux which generate | occur | produces a reluctance torque and the magnetic flux from a permanent magnet are mixed, and it turns out that it is magnetically saturated.

  On the other hand, in the rotating electrical machine 10 according to the present embodiment, the gap 47 can suppress the mixing of the magnetic flux that generates the reluctance torque and the magnetic flux from the permanent magnet, and the magnetic flux is saturated. This can be suppressed.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention is suitable for a rotating electrical machine.

It is a sectional side view of the rotary electric machine which concerns on this Embodiment 1. FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is sectional drawing which shows the detail of a magnet pair and the surrounding structure. It is a sectional side view of the rotary electric machine at the time of strong field control. It is sectional drawing at the time of strong field control. It is a sectional side view of the rotary electric machine at the time of field weakening control. It is sectional drawing of the rotary electric machine at the time of field weakening control. It is sectional drawing which shows the magnetic flux density of the conventional rotary electric machine.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 21 Field yoke, 22 Stator core, 23 Stator teeth, 24 Coil, 30 Stator, 35 Stator coil, 40 Rotor, 41 Rotating shaft, 42 Magnet pair, 43 Rotor core, 43b Powdered rotor core, 43a Laminated rotor core, 44A , 44B magnet, 45 magnetic flux path part, 47 gap part, 48 magnetic flux path part, 50, 51 field coil, 100 control device.

Claims (4)

A rotating shaft provided rotatably around a rotation axis;
A stator including an annularly formed stator core and a stator coil wound around the stator core;
A rotor core fixed to the rotating shaft and inserted into the stator, and a rotor including a magnet embedded in the rotor core such that magnetic poles are aligned in the radial direction of the rotor core;
A field yoke provided on the outer periphery of the stator core;
Winding capable of controlling the amount of magnetic flux between the rotor core and the stator core by forming a magnetic circuit between the field yoke and the rotor;
With
In the rotor core, a gap is formed that is spaced from the magnet on the radially inner side of the rotor core.
A rotating electrical machine in which a magnetic flux path for a magnet through which a magnetic flux from the magnet flows is formed between the magnet and the gap.   The rotating electrical machine according to claim 1, wherein the gap extends along an edge of the magnet.   A plurality of the magnets are formed at intervals in the circumferential direction of the rotor core, and the gap portions are provided on the radially inner side of the rotor core with respect to the magnets, and the gap portions are formed on the rotor core. The stator coil magnetic flux passage through which the magnetic flux generated by supplying current to the stator coil flows is defined in a portion of the rotor core located between the gaps. The rotating electrical machine according to claim 1 or claim 2.   The rotating electrical machine according to any one of claims 1 to 3, wherein a width of the gap is wider than a width of the magnetic flux passage for the magnet.

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