JP6249417B2 - Rotating electric machine and electric power steering device - Google Patents

Description

  The present invention relates to a rotary electric machine and an electric power steering apparatus including a stator core having a partially closed slot shape and a rotor in which permanent magnets are embedded, and particularly to leakage at a connecting portion that connects between teeth tip portions of the stator core. The present invention relates to a rotor structure that reduces magnetic flux and increases torque.

  A conventional rotating electric machine is manufactured by fitting and laminating a yoke laminated core produced by fitting and stacking punched annular yoke core pieces and a punched magnetic pole core piece, and spaced in the circumferential direction. An open slot type stator core having a magnetic pole laminated core fitted and fixed inside the yoke laminated iron core has been used.

  A conventional stator core of a rotating electric machine has a magnetic pole laminated core divided into one magnetic pole and fitted and fixed to the yoke laminated iron core, so that the structure is not sufficiently rigid, and during winding and handling, There was a problem that the stator core was deformed and the yield was lowered.

  In view of such a situation, the magnetic pole laminated iron core fitted and fixed inside the annular yoke laminated iron core is divided for each magnetic pole, and divided magnetic pole core pieces arranged radially with a gap therebetween are fitted. A conventional stator core of a rotating electric machine has been proposed, which is composed of a laminated magnetic pole laminated core and a connected magnetic pole core piece that is fitted and laminated on the upper and lower parts of the divided magnetic pole laminated core. (For example, refer to Patent Document 1). Furthermore, a laminated iron core comprising a cylindrical outer peripheral part, a tooth part for winding the winding, and an inner peripheral part integrally connecting the inner diameter side of the tooth part in the circumferential direction by the required number. There has been proposed a stator core of a conventional rotating electric machine in which a short-circuit coil is installed in a connecting portion (see, for example, Patent Document 2).

  In the conventional stator iron cores of rotating electrical machines described in Patent Documents 1 and 2, the inner diameter sides of the magnetic pole portions of the required number of core pieces disposed on both axial ends are connected by a connecting portion. Therefore, the rigidity of the structure is increased, and the occurrence of deformation of the stator core during winding or handling can be suppressed. Further, since the core pieces whose inner diameter side of the magnetic pole portion is connected by the connecting portion are disposed only at both end sides in the axial direction of the stator core, the core pieces whose inner diameter side of the magnetic pole portion is connected by the connecting portion. As compared with a closed slot type stator core composed only of the above, the amount of leakage magnetic flux in the connecting portion is reduced and higher torque is achieved.

  Further, in the stator core of the conventional rotating electric machine described in Patent Document 2, the magnetic flux generated in the short-circuiting coil acts so as to cancel out the leakage magnetic flux including the harmonic component of the coupling portion. Thus, the torque is reduced and the torque is increased.

JP-A-6-133501 Japanese Patent Laid-Open No. 6-22478

In the stator core of the conventional rotating electric machine described in Patent Document 1, leakage flux flows through the connecting portions of the connecting magnetic pole core pieces disposed on both ends in the axial direction of the stator core, so that the torque is sufficient. There was a problem that it could not be increased.
In the stator core of the conventional rotating electrical machine described in Patent Document 2, the magnetic flux generated in the short circuit coil varies depending on the rotational speed of the rotating electrical machine. Therefore, depending on the driving rotational speed of the rotating electrical machine, there is a problem that the leakage magnetic flux flowing through the connecting portion is not sufficiently reduced and the torque cannot be sufficiently increased.

  The present invention has been made in order to solve the above-described problem, and an iron core connecting block in which a magnetic flux density increasing portion is formed in a partial region in the axial direction of a magnetic air gap and constituting a part of a stator iron core Placed in the formation area of the magnetic flux density increasing part, magnetically saturating the connecting part connecting the tip side of the teeth, reducing the leakage magnetic flux in the connecting part, increasing the rigidity as the structure and increasing the torque It is an object to obtain a rotating electrical machine and an electric power steering device that can be realized.

The rotating electrical machine according to the present invention includes an annular core back, a plurality of teeth protruding radially inward from the inner peripheral surface of the core back, and spaced apart from each other in the circumferential direction, and the plurality of teeth Stator cores having flanges projecting from the respective tip end portions of the teeth on both sides in the circumferential direction, a stator having a stator winding mounted on the stator core, a rotor core, and a shaft of the rotor core It has a rotating shaft that passes through the core position and is fixed to the rotor core, and a plurality of permanent magnets embedded in the rotor core, and is coaxially connected to the inner peripheral side of the stator via a magnetic gap. And a rotor disposed on the surface. The stator core has a core connecting block in which the first stator core sheets, in which the flanges adjacent in the circumferential direction are connected by a connection part, and the flanges adjacent in the circumferential direction are spaced apart from each other. A core opening block in which two stator core sheets are laminated, and a magnetic flux density increasing portion is formed in a partial region in the axial direction of the magnetic gap portion; At least a part of the arrangement area of the overlaps with the formation area of the magnetic flux density increasing portion in the axial direction, and the arrangement area of the iron core connection block arranged in the formation area of the magnetic flux density increase portion is the above The ratio in the axial direction with respect to the formation area of the magnetic flux density increasing portion is such that the arrangement area of the core connection block arranged in the area excluding the magnetic flux density increasing area is the area excluding the magnetic flux density increasing area. Percentage in the axial direction Greater than.

According to the present invention, the stator core has a core connecting block in which the first stator core sheets in which the flanges adjacent to each other in the circumferential direction are connected by the connection part are separated from the flanges adjacent to each other in the circumferential direction. Since the core opening block in which the second stator core sheets are laminated is laminated in the axial direction, the rigidity as the structure is increased.
The magnetic flux density increasing portion is formed in a partial region in the axial direction of the magnetic gap portion, and at least a part of the arrangement region of the core connecting block overlaps with the forming region of the magnetic flux density increasing portion in the axial direction. Therefore, the increased magnetic flux flows through the connecting portion, and the connecting portion is magnetically saturated. Therefore, the magnetic flux generated in the stator winding is less likely to flow to the adjacent teeth through the collar. As a result, the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding is reduced, so that the effective magnetic flux amount that contributes to the torque generation of the magnetic flux generated by the stator winding increases. High torque can be achieved.

It is a longitudinal cross-sectional view which shows the electric drive device carrying the rotary electric machine which concerns on Embodiment 1 of this invention. It is an end elevation which shows the rotary electric machine which concerns on Embodiment 1 of this invention. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. It is a perspective view which shows the principal part of the rotor in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view explaining the manufacturing method of the stator core in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view explaining the embodiment of the manufacturing method of the stator core in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the axial direction position in the experimental machine 1 of the rotary electric machine which concerns on Embodiment 1 of this invention, and the increase rate of the magnetic flux density of a magnetic space | gap part. It is a figure explaining the flow of the magnetic flux in the rotary electric machine of the comparative example 1. FIG. It is a figure explaining the flow of the magnetic flux in the experimental machine 1 of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the flow of the magnetic flux in the rotary electric machine which concerns on Embodiment 1 of this invention. It is an end elevation which shows the principal part of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the ratio of the protrusion height with respect to the width | variety of the permanent magnet in the rotary electric machine which concerns on Embodiment 1 of this invention, and torque. It is a figure which shows the relationship between the rotation speed and torque in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 4 of this invention. It is an end elevation which shows the rotary electric machine which concerns on Embodiment 5 of this invention. It is an end elevation which shows the rotary electric machine which concerns on Embodiment 6 of this invention. It is a perspective view which shows the principal part of the rotor in the rotary electric machine which concerns on Embodiment 6 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 7 of this invention. It is a figure explaining the flow of the magnetic flux in the rotary electric machine which concerns on Embodiment 7 of this invention. It is a figure which shows the torque improvement rate with respect to the comparative example 2 of the rotary electric machine which concerns on Embodiment 7 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine of the comparative example 2, Example 1, Example 2, and Example 3. FIG. It is a figure explaining the structure of the rotor in the rotary electric machine which concerns on Embodiment 8 of this invention. It is a figure explaining the flow of the magnetic flux in the rotary electric machine which concerns on Embodiment 8 of this invention. It is a perspective view which shows the principal part of the rotor in the rotary electric machine which concerns on Embodiment 9 of this invention. It is a top view which shows the 1st rotor core sheet which comprises the rotor core in the rotary electric machine which concerns on Embodiment 9 of this invention. It is a top view which shows the 2nd rotor core sheet which comprises the rotor core in the rotary electric machine which concerns on Embodiment 9 of this invention. It is an end elevation which shows the principal part of the rotor core in the rotary electric machine which concerns on Embodiment 9 of this invention. It is a figure which shows the relationship between the axial direction position in the experimental machine 2 of the rotary electric machine which concerns on Embodiment 9 of this invention, and the increase rate of the magnetic flux density of a magnetic space | gap part. It is a figure explaining the flow of the magnetic flux in the rotary electric machine which concerns on Embodiment 9 of this invention. It is a perspective view which shows the principal part of the rotor in the rotary electric machine which concerns on Embodiment 10 of this invention. It is a longitudinal cross-sectional view which shows the rotary electric machine which concerns on Embodiment 10 of this invention. It is explanatory drawing of the electric power steering apparatus of the motor vehicle based on Embodiment 11 of this invention.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing an electric drive apparatus equipped with a rotary electric machine according to Embodiment 1 of the present invention. In addition, a longitudinal cross-sectional view is a cross-sectional view in a plane including the axis of the rotating shaft of the rotating electrical machine of the electric drive device.

  In FIG. 1, the electric drive device 100 includes a rotating electrical machine 101 and an ECU (Electronic Control Unit) unit 200 that is disposed integrally with the rotating electrical machine 101 on one axial side of the rotating electrical machine 101.

  The rotating electrical machine 101 includes an annular stator 20 and a rotor 10 that is coaxially and rotatably disposed inside the stator 20 via a magnetic gap 9. Here, the magnetic gap 9 is a region between the rotor core 11 and the stator core 21, that is, a region where the rotor core 11 and the stator core 21 overlap in the axial direction.

  The stator 20 includes an annular stator core 21 and a stator winding 22 wound around the stator core 21. The stator 20 is held by the frame 1 by fixing the stator core 21 to the cylindrical portion 1 a of the bottomed cylindrical frame 1 by press fitting or shrink fitting. The rotor 10 includes a rotor core 11 fixed to a rotation shaft 12 penetrating the shaft center position, and a plurality of permanent magnets 13 embedded in the rotor core 11. The rotor 10 includes a housing 2 that closes the opening of the frame 1 and bearings 3 and 4 disposed on the bottom 1b of the frame 1 so that the rotary shaft 12 is supported. It is rotatably arranged. A pulley 5 is disposed on a protruding portion of the rotating shaft 12 from the housing 2.

  The ECU unit 200 includes an inverter circuit for driving the rotating electrical machine 101, and the inverter circuit includes a switching element 201 such as a MOS-FET. A heat sink 202 is attached to the bottom 1 b side of the frame 1. The switching element 201 is mounted on the surface of the heat sink 202 opposite to the frame 1. Further, a case 203 is attached to the heat sink 202 so as to enclose the switching element 201. In the case 203, an intermediate member 204 and a control board 205 are provided.

  In addition to the switching element 201, the inverter circuit includes a smoothing capacitor, a noise removing coil, a power supply relay, a bus bar for electrically connecting them, and the like, which are omitted in FIG. The bus bar is integrally formed with resin to form an intermediate member 204.

  Based on the information received from the first and second connectors 206 and 207, the control board 205 sends a control signal to the switching element 201 in order to drive the rotating electrical machine 101 appropriately. The control signal is transmitted by a connection member 209 that electrically connects the control board 205 and the switching element 201.

  The magnetic sensor 210 is attached to a substrate 213 supported by the heat sink 202 via a support part 212. The magnetic sensor 210 is disposed on the same axis as the rotation axis of the rotating electrical machine 101 and is opposed to the magnetic sensor 210. The magnetic sensor 210 detects the magnetic field generated by the sensor permanent magnet 211 and knows the direction of the rotation of the rotor 10. Detect the angle. Electric power is sent to ECU 200 via a power connector 208 from a battery (not shown) or the like. The ECU 200 supplies an appropriate drive current to the rotating electrical machine 101 according to the rotation angle.

  Next, the configuration of the rotating electrical machine 101 will be described. 2 is an end view showing the rotary electric machine according to Embodiment 1 of the present invention, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. 4 is a rotor in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 5 is a perspective view for explaining a method of manufacturing a stator core in the rotary electric machine according to the first embodiment of the present invention, and FIG. 6 is a diagram in the rotary electric machine according to the first embodiment of the present invention. It is a perspective view explaining the embodiment of the manufacturing method of a stator core. In FIG. 2, for convenience, reference numerals 1 to 18 are assigned to the teeth in the order of arrangement in the circumferential direction. Further, the concentrated winding coil wound around each tooth is numbered for convenience so that it can be understood whether it is a coil of U phase, V phase, or W phase. .

  As shown in FIGS. 2 to 4, the rotor 10 includes a rotor core 11 manufactured by laminating and integrating a rotor core sheet punched from an electromagnetic steel plate, and an axial center position of the rotor core 11. A rotation shaft 12 inserted and fixed to the rotor core 11 and a permanent magnet 13 embedded in the rotor core 11 are provided. The rotor core 11 and the annular base portion 11a into which the rotating shaft 12 is inserted are spaced apart from each other in the circumferential direction and arranged at an equiangular pitch in the circumferential direction, and are arranged on the outer peripheral side of the base portion 11a. Each of the magnetic pole portions 11b includes 14 bridge portions 11c that extend radially outward from the base portion 11a and mechanically connect the base portion 11a and the magnetic pole portion 11b.

  The permanent magnet 13 is made into a rod-shaped body having a rectangular cross section, and is disposed between the magnetic pole portions 11b adjacent to each other in the circumferential direction with the longitudinal direction of the rectangular cross section in the radial direction and the short direction in the circumferential direction. 11b is fixed. The permanent magnets 13 are arranged in the circumferential direction so that the short direction of the rectangular cross section is the magnetization direction 16 and the same polarity faces each other. The permanent magnet 13 is disposed on the rotor core 11 so as to protrude from the rotor core 11 by Le (however, Le> 0) on both sides in the axial direction. The axial length of the rotor core 11 is L.

  The 14 magnetic pole parts 11b are arranged so that the circumferential center part of each outer peripheral surface is in contact with one cylindrical surface centering on the axis of the base part 11a. And the outer peripheral surface of the magnetic pole part 11b becomes a curved surface convex outward in the radial direction, which is constituted by a part of the cylindrical surface having a smaller radius of curvature than the radius of curvature of the cylindrical surface with which the central portion in the circumferential direction of the outer peripheral surface is in contact. Yes. Furthermore, the space 14 surrounded by the base portion 11a, the bridge portion 11c, the magnetic pole portion 11b, and the permanent magnet 13 is filled with air and is a non-magnetic portion.

  The space 14 is not limited to air but may be filled with nonmagnetic resin or metal. The bridge portion 11c is provided so as to connect all the magnetic pole portions 11b and the base portion 11a, but a part of the bridge portions 11c may be omitted. For example, when the bridge portion 11c that connects one magnetic pole portion 11b and the base portion 11a of the pair of magnetic pole portions 11b sandwiching the permanent magnet 13 is omitted, the one magnetic pole portion 11b, the bridge portion 11c, and the base portion from the permanent magnet 13 are omitted. The magnetic path returning to the permanent magnet 13 via the 11a, the bridge portion 11c, and the other magnetic pole portion 11b is eliminated, thereby reducing the leakage of magnetic flux generated by the permanent magnet 13 and improving the torque.

  In the rotor 10 configured as described above, the outer circumferential surface of the magnetic pole portions 11b arranged in the circumferential direction is the intermediate position in the circumferential direction between the adjacent permanent magnets 13, and the radial width of the magnetic gap portion 9 is the smallest. It is formed in a curved surface convex outward in the radial direction. Thereby, the waveform of the magnetic flux density which generate | occur | produces in the magnetic space | gap part 9 becomes smooth, and cogging torque and a torque ripple can be reduced. The permanent magnets 13 are manufactured in a rod-like body having a rectangular cross section, and are arranged in the circumferential direction so that the short direction of the rectangular cross section is the magnetization direction 16 and the magnetization direction 16 is in the circumferential direction so that the same polarity faces each other. Has been. Thereby, the magnetic flux generated by the permanent magnet 13 is concentrated on the magnetic pole part 11b, and the magnetic flux density can be increased, and the torque can be increased. Since the permanent magnet 13 is made into a rod-shaped body having a rectangular cross section, the machining cost of the magnet is reduced, and the cost of the rotating electrical machine 101 can be reduced. Since the space 14 surrounded by the base portion 11a, the bridge portion 11c, the magnetic pole portion 11b, and the permanent magnet 13 is a non-magnetic portion, leakage of magnetic flux generated by the permanent magnet 13 is reduced, and high torque is achieved. It is done.

  The stator core 21 is manufactured by stacking and integrating stator core sheets punched from electromagnetic steel sheets, and extends radially inward from the annular core back 21a portion and the inner peripheral wall surface of the core back 21a, respectively. 18 teeth 21b arranged at equiangular pitches in the circumferential direction, flanges 21c projecting from the tip of the teeth 21b on both sides in the circumferential direction, and coupling parts connecting between the flanges 21c adjacent in the circumferential direction 21d. As will be described later, the stator core 21 includes an iron core connection block 33 in which the flange portions 21c adjacent in the circumferential direction are connected by the connection portion 21d, and an iron core opening in which the flange portions 21c adjacent in the circumferential direction are separated from each other. This is a partially closed slot type stator core, which is configured by being laminated on both axial ends of the block 34. The space formed between the core back 21a and the teeth 21b adjacent in the circumferential direction is the slot 23.

  The stator core 21 configured as described above includes both end portions in the axial direction as core connecting blocks 33 in which the flange portions 21c adjacent in the circumferential direction are connected by a connecting portion 21d. Therefore, since the rigidity as a structure is increased, the occurrence of deformation of the stator core 21 during winding or handling is suppressed. Further, when the rotating electrical machine 101 is driven, the electromagnetic force acts to distort the inner peripheral side of the stator core 21, but the rigidity on the inner diameter side of the stator core 21 is increased, so that the vibration of the rotating electrical machine 101 is reduced. Occurrence is suppressed. Further, since the slot 23 is closed by the connecting portion 21d, the concentrated winding coil 22a constituting the stator winding 22 is prevented from jumping out from the stator core 21 to the inner diameter side, and the cogging torque or electromagnetic excitation force is prevented. The harmonic component of the slot permeance that causes it is reduced, and the cogging torque and electromagnetic excitation force can be reduced.

  Next, a method for manufacturing the stator core 21 will be described with reference to FIG.

  The stator core 21 is composed of six divided cores 30. The split iron core 30 includes an iron core outer diameter portion 31 and an iron core inner diameter portion 32. The iron core outer diameter portion 31 is produced by fitting and laminating 40 arc-shaped stator core sheets 31a punched from an electromagnetic steel plate. Three V-shaped grooves 31b are provided on the inner peripheral wall surface of the iron core outer diameter portion 31 at an equiangular pitch in the circumferential direction with the groove direction being the stacking direction of the stator core sheet 31a. Note that the laminated stator core sheets 31a are caulked and fixed by fitting the round caulking portions 31c formed in the punching process.

  The core inner diameter portion 32 is formed by fitting and laminating 13 stator core sheets 33a formed by connecting the tip portions of three teeth portions punched from the electromagnetic steel plate, and on the shape, the shape of the teeth portion from the electromagnetic steel plates. The three stator core sheets 34a punched in the above are fitted and laminated on the three teeth portions connected to each other, and the tips of the three teeth portions punched out from the magnetic steel sheet are formed thereon. 13 stator core sheets 33a formed by connecting the parts are fitted and laminated. The core inner diameter portion 32 thus manufactured includes an iron core connection block 33 in which 13 stator core sheets 33a are fitted and laminated, and an iron core opening block 34 in which 14 pieces of three stator core sheets 34a are fitted and laminated. And a core connection block 33 in which 13 stator core sheets 33a are fitted and laminated. Note that the laminated stator core sheets 33a and 34a are caulked and fixed by fitting the caulking portions 33b and 34b having a V-shaped cross section formed in the teeth portion in the punching process.

  Forty teeth portions are fitted and laminated to form a tooth 21b. Portions connecting the tips of the teeth portions of the 13 stator core sheets 33a are stacked to form a connecting portion 21d. A root portion of the tooth 21b is a V-shaped protrusion 32a. Then, the protrusion 32a is connected to the V-shaped groove 31b by press-fitting, shrink fitting, or welding, and the iron core outer diameter portion 31 and the iron core inner diameter portion 32 are integrated to produce the divided iron core 30. The six divided iron cores 30 thus produced are arranged in an annular shape by abutting the circumferential side surfaces of the iron core outer diameter portion 31 to produce the stator iron core 21. Note that the core outer diameter portion 31 is connected in an annular shape to form the core back 21a. The stator core sheets 31a and 33a correspond to the first stator core sheet, and the stator core sheets 31a and 34a correspond to the second stator core sheet.

  In the manufacturing method according to FIG. 5, the stator core sheets 33 a and 34 a constituting the core inner diameter portion 32 are laminated by fitting the crimped portions having a V-shaped cross section formed in the punching process. Thereby, since the stator core sheets 33a and 34a to be stacked do not rotate and the stator core 21 with high roundness can be manufactured, the cogging torque can be reduced. Since the iron core connecting blocks 33 that connect the tips of the teeth portions are disposed at both axial ends of the iron core inner diameter portion 32, the strength of the iron core inner diameter portion 32 increases. Therefore, when the protrusion 32a is press-fitted into the V-shaped groove 31b and the core outer diameter portion 31 and the core inner diameter portion 32 are integrated, the stator core sheet 33a positioned at the axial end of the core inner diameter portion 32 is separated. The occurrence of such troubles is suppressed.

  Next, another method for manufacturing the stator core will be described with reference to FIG. The stator core manufactured by the manufacturing method according to FIG. 6 has a structure equivalent to the stator core manufactured by the manufacturing method according to FIG.

  In the split iron core 30 ′, three tooth portions 36 b punched from the electromagnetic steel sheet protrude from the arc-shaped portion 36 a toward the inner diameter side and are arranged at equiangular pitches in the circumferential direction, and the tips of the three tooth portions 36 b The 13 stator core sheets 36 that are connected to each other are fitted and laminated, and the teeth 37b punched out from the electromagnetic steel plate project from the arc-shaped portion 37a to the inner diameter side. Fourteen stator core sheets 37, which are arranged in a circumferential direction at an equiangular pitch and are separated from the tip portions of the three teeth portions 37b, are fitted and laminated, and then punched from a magnetic steel sheet 13 The stator core sheets 36 are manufactured by fitting and laminating. The laminated stator core sheets 36 and 37 are fitted with round crimping portions 36c and 37c formed by a punching process, and fitted with V-shaped crimping portions 36d and 37d to be crimped and fixed. The

  The split core 30 ′ thus produced has an iron core connection block 33 ′ in which 13 stator core sheets 36 are fitted and laminated, and an iron core opening block 34 ′ in which 14 stator core sheets 37 are fitted and laminated. And a core connection block 33 ′ in which 13 stator core sheets 36 are fitted and laminated.

  Forty arc-shaped portions 36a and 37a are fitted and laminated to form a core back portion, and 40 teeth portions 36b and 37b are fitted and laminated to form teeth 21b. Portions that connect the tip portions of the 13 teeth portions 36b are stacked to form a connecting portion 21d. The six divided iron cores 30 ′ thus produced are arranged in an annular shape by butting the side surfaces in the circumferential direction of the core back portion, thereby producing the stator iron core. In addition, a core back part is connected circularly and becomes the core back 21a. The stator core sheet 36 corresponds to a first stator core sheet, and the stator core sheet 37 corresponds to a second stator core sheet.

  In the manufacturing method according to FIG. 6, the core back portion and the teeth 21b are integrally manufactured. Therefore, compared with the structure in which the core outer diameter portion 31 and the core inner diameter portion 32 in the manufacturing method according to FIG. The rigidity of the stator core can be further increased, and the vibration of the stator core caused by the connecting portion between the core outer diameter portion 31 and the core inner diameter portion 32 can be reduced.

  The stator winding 22 includes 18 concentrated winding coils 22a wound around the teeth 21b. Here, the U phase is composed of six concentrated winding coils 22a of + U11, -U12, + U13, -U21, + U22, and -U23, and the V phase is + V11, -V12, + V13, -V21, + V22, -V. It is composed of six concentrated winding coils 22a of V23, and the W phase is composed of six concentrated winding coils 22a of -W11, + W12, -W13, + W21, -W22, + W23. As shown in FIG. 2, the 18 concentrated winding coils 22a correspond to the teeth 21b from No. 1 to No. 18, respectively, + U11, + V11, -V12, -W11, -U12, + U13, + V13, + W12. , -W13, -U21, -V21, + V22, + W21, + U22, -U23, -V23, -W22, + W23. Note that “+” and “−” indicate the winding polarity of the concentrated winding coil 22a, and “+” and “−” are opposite winding polarities. Six concentrated winding coils 22a constituting the U phase are connected to constitute a U phase coil, and six concentrated winding coils 22a constituting the V phase are connected to constitute a V phase coil to constitute a W phase. 6 concentrated winding coils 22a are connected to form a W-phase coil, and further, a U-phase coil, a V-phase coil and a W-phase coil are Y-connected or Δ-connected to form a stator winding 22 Is done.

  The rotor 10 and the stator 20 configured as described above are disposed coaxially via the magnetic gap portion 9. Further, the rotor core 11 and the stator core 21 are manufactured to have the same axial length, and are arranged so that both end surfaces in the axial direction are flush with each other. The rotating electrical machine 101 including the rotor 10 and the stator 20 has 14 poles and 18 slots with concentrated winding, and the electromagnetic excitation force with a spatial order of 2 is smaller than that with 10 poles and 12 slots with concentrated winding. And noise can be reduced. Further, the winding coefficients of the harmonics, particularly the 6f component and 12f component, which are the main components of the torque ripple, are small, and the torque ripple can be reduced. Further, since the stator winding 22 is constituted by the concentrated winding coil 22a, the coil end is small, the size can be reduced, the copper loss is small, and high efficiency is achieved.

  Next, in order to explain the effect of causing the permanent magnet 13 to protrude from the end face of the rotor core 11, an open slot type stator core 21 'constituted only by the rotor 10 and the core opening block 34, FIG. 7 shows the result of measuring the magnetic flux density of the magnetic gap portion 9 in a cross section orthogonal to the axial direction of the rotating shaft 12. FIG. 7 is a diagram showing the relationship between the axial position and the rate of increase of the magnetic flux density in the magnetic gap in the rotary electric machine experimental machine 1 according to Embodiment 1 of the present invention. Here, in FIG. 7, the horizontal axis is X / L. However, L is the axial length of the rotor core 11, and X is the axial position when one end of the rotor core 11 in the axial direction is zero. The vertical axis represents the rate of increase in the magnetic flux density of the magnetic gap 9 of the experimental machine 1 with respect to the rotating electrical machine of Comparative Example 1 at the position in the axial direction of the rotating shaft 12.

  In the rotating electrical machine of Comparative Example 1, an open slot type stator core 21 ′ made of only the iron core opening block 34 and a permanent magnet 13 ′ having the same cross-sectional shape as the permanent magnet 13 have both end faces on the rotor core 11. It was produced using a rotor 10 ′ embedded so as to be flush with both axial end faces. The permanent magnet 13 ′ is made to have the same length as the axial length of the rotor core 11 and is shorter than the permanent magnet 13. Further, since both end surfaces in the axial direction of the rotor core 11 are flush with both end surfaces in the axial direction of the stator core 21, the axial length of the magnetic gap portion 9 is the axis of the rotor core 11. Match the direction length.

  From FIG. 7, in the experimental machine 1 using the rotor 10 in which the permanent magnet 13 protrudes from the end face of the rotor core 11, X / L is 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / It was confirmed that the increase rate of the magnetic flux density of the magnetic gap portion 9 was large with respect to the rotating electrical machine of Comparative Example 1 in the range of L ≦ 1. Further, in the rotating electrical machine of Comparative Example 1, the magnetic flux density of the magnetic gap portion 9 was substantially uniform in the axial direction. Therefore, in the experimental machine 1 using the rotor 10 in which the permanent magnet 13 protrudes from the end face of the rotor core 11, the magnetic flux density of the magnetic gap 9 is 0 ≦ X / L ≦ 0.325 and 0.675. It was found that it increased in the range of ≦ X / L ≦ 1. That is, in the experimental machine 1, the magnetic flux density increasing portion 35 was formed in the ranges of 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L ≦ 1.

  Next, the reason why the magnetic flux density increasing portion 35 is formed will be described with reference to FIGS. FIG. 8 is a diagram illustrating the flow of magnetic flux in the rotating electrical machine of Comparative Example 1, and FIG. 9 is a diagram illustrating the flow of magnetic flux in the experimental machine 1 of the rotating electrical machine according to Embodiment 1 of the present invention.

  In the rotating electrical machine of Comparative Example 1, as indicated by arrows in FIG. 8, the magnetic flux of the permanent magnet 13 ′ flows in the circumferential direction and enters the N-pole magnetic pole part 11b, and flows through the magnetic pole part 11b radially outward. Then, it flows into the teeth 21b through the magnetic gap 9. Further, in the rotating electrical machine of Comparative Example 1, since the permanent magnet 13 ′ is flush with the end face of the rotor core 11, the magnetic flux that has entered the N-pole magnetic pole portion 11b as shown by the arrow in FIG. Part of the magnetic pole portion 11b flows outward in the axial direction through the N-pole magnetic pole portion 11b, and then flows in the circumferential direction on the end face of the permanent magnet 13 'to enter the S-pole magnetic pole portion 11b. It flows inward in the direction and returns to the permanent magnet 13 '. The magnetic flux flowing through this magnetic path becomes a leakage magnetic flux. Due to this leakage magnetic flux, the amount of magnetic flux flowing from the magnetic pole portion 11b into the tooth 21b through the magnetic gap portion 9 is reduced.

  On the other hand, in the experimental machine 1, the magnetic flux generated by the permanent magnet 13 flows in the circumferential direction and enters the N-pole magnetic pole part 11b and flows radially outward in the magnetic pole part 11b, as indicated by arrows in FIG. Then, it flows into the teeth 21b through the magnetic gap 9. The permanent magnet 13 protrudes from the end face of the rotor core 11. Therefore, the magnetic flux that has entered the N-pole magnetic pole part 11b from the permanent magnet 13 flows axially outward through the N-pole magnetic pole part 11b, and then flows in the circumferential direction on the end face of the permanent magnet 13 to become the S-pole magnetic pole part 11b. In addition, a magnetic path that flows inward in the axial direction through the magnetic pole portion 11b of the S pole and returns to the permanent magnet 13 is not formed. Furthermore, since the magnet amount increases by the amount of protrusion of the permanent magnet 13 from the end face of the rotor core 11, the amount of magnetic flux generated by the permanent magnet 13 increases. The increased magnetic flux enters the N-pole magnetic pole part 11b from the outside in the axial direction through the air layer, flows radially outward through the magnetic pole part 11b, and flows into the teeth 21b through the magnetic gap part 9. As a result, the amount of magnetic flux flowing from the magnetic pole portion 11b into the teeth 21b via the magnetic gap portion 9 increases, and the magnetic flux density of the magnetic gap portion 9 increases relative to the rotating electrical machine of the first comparative example.

  Further, since the rotor core 11 is a laminated body of rotor core sheets coated with insulation, there is a magnetic resistance between the rotor core sheets, and magnetic flux does not easily flow through the rotor core 11 in the stacking direction, that is, in the axial direction. . Therefore, the amount of magnetic flux increased by causing the permanent magnet 13 to protrude from the end face of the rotor core 11 flows into the teeth 21b mainly from both ends of the rotor core 11. Accordingly, as shown in FIG. 7, it is assumed that the magnetic flux density increasing portions 35 are formed on both end sides in the axial direction of the rotor core 11.

  Next, the flow of magnetic flux generated by the permanent magnet 13 in the rotating electrical machine 101 will be described with reference to FIG. FIG. 10 is a diagram for explaining the flow of magnetic flux in the rotary electric machine according to Embodiment 1 of the present invention.

  The magnetic flux generated by the permanent magnet 13 flows into the teeth 21b, the flange portion 21c, and the connecting portion 21d of the iron core connecting block 33 as indicated by arrows in FIG. In the rotating electrical machine 101, the iron core connecting blocks 33 are arranged on both end sides in the axial direction of the stator iron core 21, and the arrangement position of the iron core connecting blocks 33 in the axial direction increases the magnetic flux density of the magnetic gap portion 9. This coincides with the formation region of the portion 35. Therefore, since the increased amount of magnetic flux flows into the connecting portion 21d, the connecting portion 21d is magnetically saturated, and the magnetic resistance of the connecting portion 21d increases. This makes it difficult for the magnetic flux generated by the stator winding 22 to flow to the adjacent teeth 21b through the connecting portion 21d. As described above, the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding 22 is reduced, so that the effective magnetic flux amount contributing to the torque generation of the magnetic flux generated by the stator winding 22 increases. Thus, the torque of the rotating electrical machine 101 can be increased.

  Next, the relationship between the radial width a of the connecting portion 21d and the radial minimum width g of the magnetic gap portion 9 will be described with reference to FIG. FIG. 11 is an end view showing a main part of the rotary electric machine according to Embodiment 1 of the present invention.

  The amount of magnetic flux flowing from the rotor core 11 into the stator core 21 is affected by the size of the magnetic gap 9. If the radial width of the connecting portion 21d is made smaller than the radial width of the magnetic gap portion 9, the radial width of the connecting portion 21d becomes smaller with respect to the amount of magnetic flux, and the connecting portion 21d is likely to be magnetically saturated. Become. Therefore, the magnetic resistance of the connecting portion 21d is increased, and the leakage magnetic flux using the connecting portion 21d as a path is reduced. Thereby, the effective magnetic flux amount of the magnetic flux generated by the stator winding 22 is increased, and the torque of the rotating electrical machine 101 is increased. Therefore, from the viewpoint of increasing the torque, it is preferable that the radial width “a” of the connecting portion 21 d be smaller than the minimum radial width “g” of the magnetic gap portion 9.

  Next, FIG. 12 shows the results of measuring the torque of the rotating electrical machine 101 while fixing the protrusion height Le of the permanent magnet 13 from the end face of the rotor core 11 and changing the circumferential width W of the permanent magnet 13. FIG. 12 is a diagram showing the relationship between the ratio of the protrusion height to the width of the permanent magnet and the torque in the rotary electric machine according to Embodiment 1 of the present invention. In FIG. 12, the horizontal axis represents the ratio of the protruding height to the width of the permanent magnet (Le / W). The vertical axis represents the rotating electrical machine of Comparative Example 2 using the stator 20 and the rotor 10 ′ in which the end surface of the permanent magnet 13 ′ is flush with the end surface of the rotor core 11 instead of the rotor 10. The torque improvement rate of the rotating electrical machine 101 with respect to.

  From FIG. 12, when Le / W is increased, the torque improvement rate is increased. When Le / W is about 1.0, the torque improvement rate is maximized. When Le / W is further increased, the torque improvement rate is decreased. all right. Here, when the Le / W is less than 0.5, the torque improvement rate decreases because the permanent magnet 13 enters the N-pole magnetic pole portion 11b and flows through the magnetic pole portion 11b radially inward. The leakage magnetic flux that flows through the end face of the magnetic pole portion 11b of the S pole cannot be reliably suppressed, so the amount of magnetic flux that flows into the connecting portion 21d is reduced, and the magnetic saturation of the connecting portion 21d is less likely to occur. Further, when the Le / W exceeds 1.8, the torque improvement rate decreases because the magnetic resistance of the air layer, which is a magnetic path flowing from the protruding portion of the permanent magnet 13 to the N pole portion 11b, increases. The amount of magnetic flux flowing into the N-pole magnetic pole portion 11b from the protruding portion of the permanent magnet 13 is reduced, so that the amount of magnetic flux flowing into the connecting portion 21d is reduced, and it is difficult to magnetically saturate the connecting portion 21d. .

  Therefore, Le / W is preferably set to 0.5 or more and 1.8 or less from the viewpoint of the torque improvement rate. Then, Comparative Example 2 using the rotor 10 ′ in which the end surface of the permanent magnet 13 ′ is flush with the end surface of the rotor core 11 by setting Le / W to be 0.5 or more and 1.8 or less. The torque improvement rate for the rotating electrical machine can be 4% or more.

  Next, FIG. 13 shows the results of measuring the torque of the rotating electrical machine 101 while changing the rotational speed. FIG. 13 is a diagram showing the relationship between the rotational speed and torque in the rotary electric machine according to Embodiment 1 of the present invention. In FIG. 13, the horizontal axis represents the rotational speed and the vertical axis represents the torque. In FIG. 13, the dotted line indicates the rotating electrical machine 101, and the solid line indicates the rotating electrical machine of Comparative Example 2 that uses the rotor 10 ′ instead of the rotor 10. The rotation speed region where the torque is almost constant is the rated region, the maximum torque in the rated region is the rated torque, the rotation speed region where the torque is smaller than the rated torque is the high rotation region, and the torque in the high rotation region is the high rotation torque. Regarding the torque, the rated torque of the rotating electrical machine of Comparative Example 2 is 1 p. u. As for the number of rotations, the maximum number of rotations in the rated region of the rotating electrical machine of Comparative Example 2 is 1 p. u. It was.

  From FIG. 13, it was found that the rotating electrical machine 101 can increase the rated torque compared to the rotating electrical machine of Comparative Example 2. That is, the rated torque can be improved by causing the permanent magnet 13 to protrude from the end face of the rotor core 11.

  In the first embodiment, the permanent magnet 13 protrudes from both axial end surfaces of the rotor core 11, but the permanent magnet only needs to protrude from one axial end surface of the rotor core 11.

Embodiment 2. FIG.
FIG. 14 is a longitudinal sectional view showing a rotary electric machine according to Embodiment 2 of the present invention.

In FIG. 14, the stator 20 </ b> A includes a stator core 21 </ b> A and a stator winding 22. The stator core 21 </ b> A has an axis of a core opening block 34 that is formed by stacking an iron core connection block 33 that is formed by stacking 15 first stator core sheets and a stack of six second stator core sheets. It is configured to be laminated at both ends in the direction.
The rotating electrical machine 102 according to the second embodiment is configured in the same manner as in the first embodiment except that the stator 20A is used instead of the stator 20.

  Also in the second embodiment, since the iron core connection block 33 is disposed in the magnetic flux density increasing portion 35, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
FIG. 15 is a longitudinal sectional view showing a rotary electric machine according to Embodiment 3 of the present invention.

In FIG. 15, the stator 20 </ b> B includes a stator core 21 </ b> B and a stator winding 22. The stator core 21B includes an iron core connection block 33 produced by laminating eight first stator core sheets, an iron core opening block 34 produced by laminating eight second stator core sheets, Are laminated alternately in the axial direction.
The rotating electrical machine 103 according to the third embodiment is configured in the same manner as in the first embodiment except that the stator 20B is used instead of the stator 20.

Also in the third embodiment, since the iron core connection block 33 is disposed in the magnetic flux density increasing portion 35, the same effect as in the first embodiment can be obtained.
According to the third embodiment, the iron core connecting blocks 33 are disposed at both ends and the center of the stator iron core 21B in the axial direction. Therefore, the rigidity of the stator core 21B is uniform in the axial direction as compared with the stator core 21, and the rigidity of the rotating electrical machine 103 is further improved.

Embodiment 4 FIG.
FIG. 16 is a longitudinal sectional view showing a rotary electric machine according to Embodiment 4 of the present invention.

In FIG. 16, the stator 20 </ b> C includes a stator core 21 </ b> C and a stator winding 22. The stator core 21C includes an iron core connecting block 33 made of two or one first stator core sheet and an iron core opening block 34 made of one second stator core sheet in the axial direction. Are alternately stacked.
The rotating electrical machine 104 according to the fourth embodiment is configured in the same manner as in the first embodiment except that the stator 20C is used instead of the stator 20.

  In the fourth embodiment, since the core connecting blocks 33 are uniformly distributed in the axial direction, the rigidity of the stator core 21C is uniform in the axial direction, and the rigidity of the rotating electrical machine 104 can be further improved.

  In addition, nine first stator core sheets constituting the iron core connection block 33 are arranged in the region of the magnetic flux density increasing portion 35. The region of one magnetic flux density increasing portion 35 corresponds to a region where 13 stator core sheets are laminated. Further, the eight first stator core sheets constituting the iron core connection block 33 are disposed in a region that is not the magnetic flux density increasing portion 35. The region that is not the magnetic flux density increasing portion 35 corresponds to a region where 14 stator core sheets are laminated. Therefore, the ratio of the iron core connection block 33 in the region of the magnetic flux density increasing portion 35 is about 70%. On the other hand, the ratio occupied by the iron core connection block 33 in the region that is not the magnetic flux density increasing portion 35 is approximately 57%.

  Thus, since the ratio which the iron core connection block 33 occupies in the area | region of the magnetic flux density increase part 35 is larger than the ratio which the iron core connection block 33 occupies in the area | region which is not the magnetic flux density increase part 35, it is the connection part 21d contained in the iron core connection block 33. However, as a whole, magnetic saturation is likely to occur, and high torque can be achieved.

Embodiment 5. FIG.
FIG. 17 is an end view showing a rotary electric machine according to Embodiment 5 of the present invention.

  In FIG. 17, the rotating electrical machine 105 includes a stator 20D and a rotor 10A.

  The rotor 10A is fixed to the rotor core 11A by being inserted into a rotor core 11A produced by laminating and integrating a rotor core sheet punched from an electromagnetic steel sheet and an axial center position of the rotor core 11A. A rotating shaft 12 and a permanent magnet 13 embedded in the rotor core 11A are provided. The rotor core 11A is arranged on the outer peripheral side of the base portion 11a with an annular base portion 11a into which the rotary shaft 12 is inserted and spaced apart from each other in the circumferential direction and arranged at an equiangular pitch in the circumferential direction. Each of the magnetic pole portions 11b includes ten bridge portions 11c that extend radially outward from the base portion 11a and mechanically connect the base portion 11a and the magnetic pole portion 11b. The permanent magnet 13 is disposed on the rotor core 11A so as to protrude from the rotor core 11A to both sides in the axial direction.

  The stator 20D includes a stator core 21D and a stator winding 22D.

  The stator core 21D includes an annular core back 21a portion, twelve teeth 21b that extend radially inward from the inner peripheral wall surface of the core back 21a, and are arranged at an equiangular pitch in the circumferential direction. In addition, a flange portion 21c that protrudes from the distal end portion of the tooth 21b to both sides in the circumferential direction and a connecting portion 21d that connects between the flange portions 21c adjacent in the circumferential direction are provided. And although stator iron core 21D is not shown in figure, the iron core connection block formed by laminating | stacking 13 1st stator core sheets, and connecting between the collar parts 21c by the connection part 21d, 14 It is constructed by laminating at both ends in the axial direction of an iron core opening block which is produced by laminating a plurality of second stator core sheets and in which the flange portions 21c are separated. The stator winding 22D is composed of twelve concentrated winding coils 22a wound around each of the teeth 21b. The space formed between the core back 21a and the teeth 21b adjacent in the circumferential direction is the slot 23.

  Also in the fifth embodiment, the permanent magnet 13 is disposed on the rotor core 11A so as to protrude from both axial end surfaces of the rotor core 11A. It is formed on both end sides in the axial direction. And the iron core connection block of stator iron core 21D is arrange | positioned so that it may correspond with the formation area of a magnetic flux density increase part. Therefore, also in the fifth embodiment, the same effect as in the first embodiment can be obtained.

  According to the fifth embodiment, since the rotating electric machine 105 has 10 poles and 12 slots of concentrated winding, the number of slots is small, winding is facilitated, and manufacturability is improved.

Embodiment 6 FIG.
18 is an end view showing a rotary electric machine according to Embodiment 6 of the present invention, and FIG. 19 is a perspective view showing a main part of a rotor in the rotary electric machine according to Embodiment 6 of the present invention.

  18 and 19, the rotating electrical machine 106 includes a stator 20 and a rotor 60 that is coaxially disposed on the inner peripheral side of the stator 20 via the magnetic gap portion 9.

  The rotor 60 is fixed to the rotor core 61 by being inserted into a rotor core 61 manufactured by laminating and integrating a rotor core sheet punched from an electromagnetic steel sheet, and an axial center position of the rotor core 61. The rotating shaft 12 and the permanent magnet 13 embedded in the rotor core 61 are provided.

  The rotor core 61 includes a rotation shaft insertion hole 61a formed so as to penetrate the axial center position of the rotor core 61 with the hole direction as an axial direction, and one rotor centering on the axis of the rotor core 61. Eighteen curved surfaces that are formed of a part of a cylindrical surface that is in contact with the cylindrical surface and that has a smaller radius of curvature than the cylindrical surface and that are convex outwardly in the radial direction and are arranged at equiangular pitches in the circumferential direction. On the inner peripheral side of each of the part 61b and the curved surface part 61b, the rotor core 61 passes through the rotor core 61 with a rectangular cross-sectional hole shape, with the short direction of the rectangular cross-section aligned with the radial direction and the hole direction as the axial direction. A magnet insertion hole 61c formed as described above.

  The rotating shaft 12 is inserted and fixed in the rotating shaft insertion hole 61a. The permanent magnet 13 is made into a rod-shaped body having a rectangular cross section that substantially matches the hole shape of the magnet insertion hole 61 c, and is inserted into and fixed to each of the magnet insertion holes 61 c and disposed in the rotor core 61. Both end portions in the length direction of the permanent magnet 13 protrude outward in the axial direction from the rotor core 61. The permanent magnets 13 are arranged in the circumferential direction so that the short direction of the rectangular cross section is the magnetization direction and the polarities of the curved surface portions 61b take N poles and S poles alternately.

  The rotating electrical machine 106 configured as described above is a concentrated winding 14 pole 18 slot. Further, since both end surfaces in the axial direction of the rotor core 61 are flush with both end surfaces in the axial direction of the stator core 21, the axial length of the magnetic gap portion 9 is the same as that of the rotor core 61. It is the same as the axial length L. Further, the permanent magnet 13 is disposed on the rotor core 61 so as to protrude from both axial end surfaces of the rotor core 61. Therefore, also in the rotating electrical machine 106, the magnetic flux density increasing portion is 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L with respect to the axial direction of the magnetic air gap 9 as in the first embodiment. It is formed in the range of ≦ 1. And the core connection block of the stator core 21 is arrange | positioned so that it may correspond with the formation area of a magnetic flux density increase part. Therefore, also in the sixth embodiment, the same effect as in the first embodiment can be obtained.

  In the sixth embodiment, since the surface area of the rotor core 61 facing the stator 20 is increased, the amount of magnetic flux flowing from the rotor core 61 into the connecting portion 21d of the stator core 21 is increased. Therefore, the connecting portion 21d is likely to be magnetically saturated, and the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding 22 is reduced, so that the torque of the magnetic flux generated by the stator winding 22 is generated. The amount of effective magnetic flux that contributes increases, and the torque of the rotating electrical machine 106 can be increased.

  In the sixth embodiment as well, when the amount of protrusion of the permanent magnet 13 from the rotor core 61 is Le and the length of the rectangular cross section of the permanent magnet 13 in the short direction, that is, the width is W, Le / W Is set to 0.5 or more and 1.8 or less, the torque improvement rate for a rotating electrical machine using a rotor in which the end surface of the permanent magnet is flush with the end surface of the rotor core 61 is 4% or more. be able to.

Embodiment 7 FIG.
20 is a longitudinal sectional view showing a rotary electric machine according to Embodiment 7 of the present invention, and FIG. 21 is a view for explaining the flow of magnetic flux in the rotary electric machine according to Embodiment 7 of the present invention.

In FIG. 20, a rotor 10B is inserted into a rotor core 11B produced by laminating and integrating rotor core sheets punched from electromagnetic steel sheets, and the rotor core 11B inserted into the axial center position of the rotor core 11B. And a permanent magnet 13 embedded in the rotor core 11B. The rotor core 11B is configured in the same manner as the rotor core 11 except that the number of laminated rotor core sheets is large. That is, both end surfaces in the axial direction of the rotor core 11 </ b> B are positioned outward in the axial direction with respect to both end surfaces in the axial direction of the stator core 21. Further, the permanent magnet 13 is disposed on the rotor core 11B with both axial ends protruding from the rotor core 11B on both sides in the axial direction.
The rotating electrical machine 107 according to the seventh embodiment is configured in the same manner as in the first embodiment except that the rotor 10B is used instead of the rotor 10.

In the rotating electrical machine 107 configured as described above, since the permanent magnet 13 is disposed on the rotor core 11B so as to protrude from both axial end surfaces of the rotor core 11B, as in the first embodiment, The magnetic flux density increasing portion 35 is formed in the range of 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L ≦ 1 with respect to the axial direction of the magnetic gap portion 9. In the seventh embodiment, since the rotor core 11B is extended axially outward from the stator core 21, the magnetic gap portion 9 is the same as that of the rotor core 11B except for the extension from the stator core 21. This is a region between the portion and the stator core 21. Therefore, L is the axial length of the stator core 21, that is, the axial length of the magnetic gap portion 9.
The core connecting block 33 of the stator core 21 is disposed so as to coincide with the formation region of the magnetic flux density increasing portion 35. Therefore, also in the seventh embodiment, the same effect as in the first embodiment can be obtained.

  Next, the flow of magnetic flux generated by the permanent magnet 13 in the rotating electrical machine 107 will be described with reference to FIG.

  The rotor core 11 </ b> B has an extension that protrudes outward in the axial direction from the axial end surface of the stator core 21. Therefore, the magnetic flux generated in the magnet portion facing the extension of the rotor core 11B flows in the circumferential direction and enters the extension of the rotor core 11B. Further, the magnetic flux generated at the protruding portion of the permanent magnet 13 protruding outward in the axial direction from the rotor core 11B, as indicated by an arrow in FIG. 21, from the outer side of the rotor core 11B through the air layer. Enter the extension. A part of the magnetic flux that has entered the extension part of the rotor core 11B flows radially outward in the magnetic pole part 11b, and flows from the axially outward direction to the stator core 21 via the air layer. The remainder of the magnetic flux that has entered the extension of the rotor core 11B flows in the magnetic pole part 11b inward in the axial direction, then flows in the magnetic pole part 11b outward in the radial direction, and passes through the magnetic gap part 9 to the stator core 21. Flowing into.

  Here, in the first embodiment, since the end surface of the stator core 21 and the end surface of the rotor core 11 are flush with each other, the magnetic flux generated at the protruding portion of the permanent magnet 13 from the rotor core 11 is The magnetic pole portion 11b is entered from the outside in the axial direction through the air layer.

  In the seventh embodiment, the end surface of the rotor core 11 </ b> B is located axially outward with respect to the end surface of the stator core 21. Therefore, in the seventh embodiment, the magnetic flux generated in the portion corresponding to the end face side portion of the rotor core 11 of the protruding portion of the permanent magnet 13 in the first embodiment is not in the axial direction but in the circumferential direction. It flows and enters the extension part of the rotor core 11B. Thus, the magnetic resistance of the path through which the magnetic flux generated in the portion corresponding to the end face side portion of the rotor core 11 of the protruding portion of the permanent magnet 13 in the first embodiment flows to the rotor core 11B is reduced. Thereby, since the magnetic flux generated in the portion corresponding to the end face side portion of the rotor core 11 of the protruding portion of the permanent magnet 13 in the first embodiment can be efficiently concentrated on the magnetic pole portion 11b, it flows into the stator core 21. The amount of magnetic flux can be increased.

  Therefore, since the increased magnetic flux flows into the connecting portion 21d of the stator core 21, the connecting portion 21d is magnetically saturated, and the magnetic resistance of the connecting portion 21d increases. This makes it difficult for the magnetic flux generated by the stator winding 22 to flow to the adjacent teeth 21b through the connecting portion 21d. As described above, the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding 22 is reduced, so that the effective magnetic flux amount contributing to the torque generation of the magnetic flux generated by the stator winding 22 increases. Thus, the torque of the rotating electrical machine 107 can be increased.

  Here, in order to explain the effect of providing the extension portion on the rotor core 11B, the rotating electrical machines of Comparative Example 2, Example 1, Example 2 and Example 3 were produced, and the rotating electrical machine of Comparative Example 2 was compared. The results of measuring the torque improvement rate are shown in FIG. FIG. 22 is a diagram showing a torque improvement rate with respect to the rotary electric machine of Comparative Example 2 of the rotary electric machine according to Embodiment 7 of the present invention. In FIG. 22, the vertical axis represents the torque increase rate of the rotating electrical machines of Examples 1 to 3 relative to the rotating electrical machine of Comparative Example 2. FIG. 23 is a longitudinal sectional view showing rotating electric machines of Comparative Example 2, Example 1, Example 2 and Example 3.

  As shown in FIG. 23A, the rotating electrical machine of Comparative Example 2 is a rotor in which a permanent magnet 13 ′ is embedded so that both end faces are flush with both end faces in the axial direction of the rotor core 11. 10 'and the stator 20 are comprised. The rotating electrical machine of Example 1 is composed of a rotor 10 and a stator 20, as shown in FIG. 23B, and corresponds to the first embodiment. In the rotating electrical machine of the second embodiment, as shown in FIG. 23 (c), a rotor 10C in which the permanent magnet 13 is embedded so that both end faces are flush with both end faces in the axial direction of the rotor core 11C. And the stator 20. As shown in FIG. 23 (d), the rotating electric machine according to the third embodiment includes a rotor 10B in which permanent magnets 13 are embedded so that both end surfaces protrude from both end surfaces in the axial direction of the rotor core 11B. The stator 20 is equivalent to the seventh embodiment.

  From FIG. 22, the rotating electrical machines of Example 1, Example 2 and Example 3 can improve the torque by 3.0%, 3.1% and 3.5%, respectively, with respect to the rotating electrical machine of Comparative Example 3. I found out. Thus, it turned out that the rotary electric machine of Example 3 can improve a torque, without increasing the axial direction length of the permanent magnet 13 with respect to the rotary electric machine of Example 1,2.

  The torque improvement by the rotating electrical machine of Example 1 with respect to the rotating electrical machine of Comparative Example 2 is considered to be the effect of increasing the amount of magnets and reducing the leakage magnetic flux through the magnet end faces by causing the permanent magnet 13 to protrude from the rotor core 11. Is done. The torque improvement by the rotating electrical machine of Example 2 with respect to the rotating electrical machine of Example 1 is achieved by embedding the protruding portion of the permanent magnet 13 from the rotor core 11 in the rotor core 11C and projecting the permanent magnet 13 from the rotor core 11. This is presumed to be the effect of efficiently flowing the magnetic flux generated in step 1 into the rotor core 11C. The torque improvement by the rotating electrical machine of Example 3 relative to the rotating electrical machine of Example 2 is presumed to be an effect of reducing the leakage magnetic flux through the magnet end surface by causing the permanent magnet 13 to protrude from the rotor core 11B.

Embodiment 8 FIG.
FIG. 24 is a view for explaining the structure of a rotor in a rotary electric machine according to Embodiment 8 of the present invention, and FIG. 25 is a view for explaining the flow of magnetic flux in the rotary electric machine according to Embodiment 8 of the present invention.

In FIG. 24, the rotor 10 </ b> D has the permanent magnet 13 ′ embedded so that both end faces are flush with both end faces in the axial direction of the rotor core 11, and the second permanent magnet 15 is the magnetic pole of the rotor core 11. It is affixed on each axial end surface of each part 11b. The second permanent magnet 15 is manufactured in a thin plate shape having the same planar shape as the end face shape of the magnetic pole portion 11b, and the thickness direction is the magnetization direction. The second permanent magnet 15 is disposed with the surface having the same polarity as the polarity of the magnetic pole part 11b facing the magnetic pole part 11b.
The rotating electrical machine according to the eighth embodiment is configured in the same manner as in the first embodiment except that a rotor 10D is used instead of the rotor 10.

  In the rotating electrical machine according to the eighth embodiment, the magnetic flux generated by the permanent magnet 13 ′ flows in the circumferential direction and enters the magnetic pole part 11 b of the rotor core 11. Further, the magnetic flux generated by the second permanent magnet 15 flows in the axial direction and enters the magnetic pole portion 11b. As a result, the amount of magnetic flux entering the magnetic pole part 11b is increased. Then, the magnetic flux that has entered the magnetic pole portion 11b flows into the teeth 21b, the flange portion 21c, and the connecting portion 21d of the stator core 21 through the magnetic gap portion 9, as indicated by arrows in FIG.

  In the eighth embodiment, since both end surfaces in the axial direction of the rotor core 11 are flush with both end surfaces in the axial direction of the stator core 21, the axial length of the magnetic gap 9 is set to the rotor. This corresponds to the axial length L of the iron core 11. Since the second permanent magnet 15 is disposed on both axial end surfaces of the magnetic pole part 11b and the magnetic flux generated by the second permanent magnet 15 flows into the magnetic pole part 11b, the magnetic flux entering the magnetic pole part 11b. The amount is increased. Therefore, also in the eighth embodiment, as in the first embodiment, the magnetic flux density increasing portion 35 has 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X with respect to the axial direction of the magnetic gap portion 9. / L ≦ 1.

  Further, the iron core connection block 33 is disposed so as to coincide with the formation region of the magnetic flux density increasing portion 35 of the magnetic gap portion 9. Therefore, also in the eighth embodiment, the connecting portion 21d is likely to be magnetically saturated, and the magnetic flux generated by the stator winding 22 is less likely to flow to the adjacent tooth 21b through the connecting portion 21d. As described above, the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding 22 is reduced, so that the effective magnetic flux amount contributing to the torque generation of the magnetic flux generated by the stator winding 22 increases. The torque of the rotating electrical machine can be increased.

In the eighth embodiment, the second permanent magnet 15 is attached to the end face of the magnetic pole part 11b. However, a notch is formed at the end of the magnetic pole part in the axial direction, and the second permanent magnet 15 is attached to the end face of the magnetic pole part 11b. The same effect can be obtained by embedding in the notch.
In the eighth embodiment, the second permanent magnet 15 is disposed on both axial end surfaces of the magnetic pole portion 11b. However, the second permanent magnet 15 is disposed only on one axial end surface of the magnetic pole portion 11b. It may be arranged.

  In the eighth embodiment, the second permanent magnet 15 is disposed on the end face of the magnetic pole part 11b of the rotor core 11 in which the permanent magnet 13 ′ having a rectangular cross section is embedded between the magnetic pole parts 11b. Even if the second permanent magnet is disposed on the end face of the magnetic pole portion of the rotor core embedded so that the permanent magnetic pole having a rectangular cross section penetrates the magnetic pole portion in the axial direction, the same effect can be obtained.

Embodiment 9 FIG.
FIG. 26 is a perspective view showing a main part of a rotor in a rotary electric machine according to Embodiment 9 of the present invention, and FIG. 27 is a first rotor constituting the rotor core in the rotary electric machine according to Embodiment 9 of the present invention. FIG. 28 is a plan view showing a core sheet, FIG. 28 is a plan view showing a second rotor core sheet constituting a rotor core in a rotary electric machine according to Embodiment 9 of the present invention, and FIG. 29 is Embodiment 9 of the present invention. It is an end elevation which shows the principal part of the rotor core in the rotary electric machine which concerns.

  In FIG. 26, a rotor 10E includes a rotor core 40 manufactured by laminating and integrating a rotor expansion core sheet 50 and a rotor non-expansion core sheet 51 as a rotor core sheet punched from an electromagnetic steel plate. , A rotating shaft 12 (not shown) that is inserted in the axial center position of the rotor core 40 and fixed to the rotor core 40, and a permanent magnet 13 ′ embedded in the rotor core 40. The rotor core 40 is arranged on the outer peripheral side of the base portion 40a, with an annular base portion 40a into which the rotating shaft 12 is inserted, and spaced apart from each other in the circumferential direction and arranged at an equiangular pitch in the circumferential direction. Each of the magnetic pole portions 40b includes 14 bridge portions 40c that extend radially outward from the base portion 40a and mechanically connect the base portion 40a and the magnetic pole portion 40b.

  The permanent magnet 13 ′ is manufactured in a rod-like body having a rectangular cross section, and is disposed between the magnetic pole portions 40 b adjacent to each other in the circumferential direction with the longitudinal direction of the rectangular cross section in the radial direction and the short direction in the circumferential direction. It is fixed to the portion 40b. The permanent magnets 13 'are arranged in the circumferential direction so that the short direction of the rectangular cross section is the magnetization direction and the same polarity faces each other. Further, both end faces in the length direction of the permanent magnet 13 ′ are flush with both end faces in the axial direction of the rotor core 40.

  As shown in FIG. 27, the rotor expansion core sheet 50 and the annular base portions 50a are spaced apart from each other in the circumferential direction and arranged at an equiangular pitch in the circumferential direction, and are arranged on the outer peripheral side of the base portion 50a. The fourteen magnetic pole portions 50b and the fourteen bridge portions 50c that extend radially outward from the base portion 50a and connect the base portion 50a and the magnetic pole portion 50b. The fourteen magnetic pole portions 50b are arranged so that the center portions in the circumferential direction of the outer peripheral surfaces are in contact with one cylindrical surface having the center of the base portion 50a as an axis. And the outer peripheral surface of the magnetic pole part 50b is a curved surface convex outward in the radial direction, which is constituted by a part of the cylindrical surface having a smaller radius of curvature than the radius of curvature of the cylindrical surface with which the central portion in the circumferential direction of the outer peripheral surface is in contact. .

  As shown in FIG. 28, the rotor non-enlarging core sheet 51 and the annular base portions 51a are spaced apart from each other in the circumferential direction and arranged at an equiangular pitch in the circumferential direction, and are arranged on the outer peripheral side of the base portion 51a. 14 magnetic pole portions 51b provided, and 14 bridge portions 51c that respectively extend radially outward from the base portion 51a and connect the base portion 51a and the magnetic pole portion 51b. Here, the rotor non-expanding core sheet 51 has the same shape as the rotor expansion core sheet 50 except that the radius of curvature of the outer peripheral surface of the magnetic pole portion 51b is smaller than the radius of curvature of the outer peripheral surface of the magnetic pole portion 50b. Yes.

  The rotor core 40 is composed of 13 rotor-enlarged core sheets 50 stacked and integrated, and an iron core expanded block 41 and 14 rotor non-expanded core sheets 51 stacked and integrated. It is configured to be laminated at both ends in the direction. Therefore, 40 base portions 50a and 51a are stacked and integrated to form the base portion 40a. Forty bridge portions 50c and 51c are stacked and integrated to form the bridge portion 40c. The 13 magnetic pole portions 50b are stacked and integrated to form the expanded magnetic pole portion 41a, and the 14 magnetic pole portions 51b are stacked and integrated to configure the non-expanded magnetic pole portion 42a. And the magnetic pole part 40b is comprised by arrange | positioning the expansion magnetic pole part 41a to the axial direction both ends of the non-expansion magnetic pole part 42a. As shown in FIG. 29, enlarged portions 43 that protrude toward the outer diameter side with respect to the non-expanded magnetic pole portion 42a are formed on both sides in the circumferential direction of the outer peripheral portion of the expanded magnetic pole portion 41a.

  The rotating electrical machine according to the ninth embodiment is configured in the same manner as in the first embodiment except that the rotor 10E is used instead of the rotor 10.

  Here, in order to explain the effect of forming the enlarged magnetic pole portion 41a on the magnetic pole portion 40b of the rotor core 40, an open slot type stator core 21 composed only of the rotor 10E and the core opening block 34 is provided. FIG. 30 shows the result of measuring the magnetic flux density of the magnetic gap portion 9 in a cross section orthogonal to the axial direction of the rotating shaft 12. FIG. 30 is a diagram showing the relationship between the axial position and the rate of increase of the magnetic flux density in the magnetic gap portion in the rotary electric machine experimental machine 2 according to Embodiment 9 of the present invention. Here, in FIG. 30, the horizontal axis is X / L. However, L is the axial length of the rotor core 40, and X is the axial position when one axial end of the rotor core 40 is zero. The vertical axis represents the rate of increase of the magnetic flux density of the magnetic gap 9 of the experimental machine 2 with respect to the rotating electrical machine of Comparative Example 3 at the position in the axial direction of the rotating shaft 12.

  In the rotating electric machine of Comparative Example 3, the permanent magnet 13 is added to the open core stator core 21 ′ made only of the core opening block 34 and the rotor core 40 ′ made only of the non-expanding block 42. And a rotor with embedded '. Further, since both end faces in the axial direction of the rotor core 40 are flush with both end faces in the axial direction of the stator core 21, the axial length of the magnetic gap portion 9 is the axis of the rotor core 40. It corresponds to the direction length L.

  From FIG. 30, in the experimental machine 2 using the rotor 10E, X / L is in the range of 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L ≦ 1. On the other hand, it was confirmed that the increase rate of the magnetic flux density in the magnetic gap portion 9 was large. In the rotating electrical machine of Comparative Example 3, the magnetic flux density of the magnetic gap portion 9 was substantially uniform in the axial direction. Therefore, in the experimental machine 2 using the rotor 10E, the magnetic flux density of the magnetic gap 9 is increased in the range of 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L ≦ 1. I understood. That is, in the experimental machine 2, the magnetic flux density increasing portion 35 is formed in the ranges of 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L ≦ 1 with respect to the axial direction of the magnetic gap portion 9.

  In the rotating electrical machine of Comparative Example 3, since the magnetic pole portion is configured only by the non-expanded magnetic pole portion 42a, the radial width of the magnetic gap portion 9 is from the circumferential central portion of the outer peripheral surface of the non-expanded magnetic pole portion 42a. It becomes wider as it is displaced to both sides in the circumferential direction. Thereby, the magnetic resistance between the stator core 21 ′ and the non-expanded magnetic pole portion 42 a increases as it is displaced to both sides in the circumferential direction of the outer peripheral surface of the non-expanded magnetic pole portion 42 a. Therefore, the magnetic flux intensively flows into the stator core 21 'from the circumferential central portion of the non-expanded magnetic pole portion 42a.

  On the other hand, in the experimental machine 2, the magnetic pole part 40b of the rotor core 40 is composed of an enlarged magnetic pole part 41a and a non-enlarged magnetic pole part 42a. The radial width of the magnetic gap 9 on both sides in the circumferential direction of the enlarged magnetic pole part 41a is narrower than the interval between the magnetic gaps 9 on both sides in the circumferential direction of the non-magnified magnetic pole part 42a. Therefore, in the enlarged magnetic pole portion 41a, the magnetic flux flows into the stator core 21 'from the entire outer peripheral surface of the enlarged magnetic pole portion 41a. That is, the amount of magnetic flux flowing from the enlarged magnetic pole portion 41a into the stator core 21 'is larger than the amount of magnetic flux flowing from the non-enlarged magnetic pole portion 42a into the stator core 21'. In the experimental machine 2, an iron core expansion block 41 formed by stacking 13 rotor expansion core sheets 50 is rotated by stacking 40 rotor expansion core sheets 50 and non-expansion core sheets 51. Since the magnetic core 40 is disposed at both axial ends, the magnetic flux density increasing portion 35 is 0 ≦ X / L ≦ 0.325 and 0.675 ≦ X / L with respect to the axial direction of the magnetic gap 9. It is inferred that it was formed within the range of ≦ 1.

  Next, the flow of magnetic flux generated by the permanent magnet 13 'in the rotating electrical machine according to the ninth embodiment will be described with reference to FIG. FIG. 31 is a diagram for explaining the flow of magnetic flux in the rotary electric machine according to Embodiment 9 of the present invention.

  In the rotating electrical machine according to the ninth embodiment, the iron core connection block 33 formed by stacking 13 first stator core sheets has an axial direction of the core opening block 34 formed by stacking 14 second stator core sheets. Since it is arrange | positioned at both ends, the arrangement | positioning area | region of the iron core connection block 33 corresponds with the formation area of the magnetic flux density increase part 35 regarding an axial direction. Therefore, the increased magnetic flux flows into the connecting portion 21d of the stator core 21 through the magnetic gap 9 as shown by the arrow in FIG. 31, so that the connecting portion 21d is magnetically saturated and the magnetic force of the connecting portion 21d is increased. Resistance increases. Thereby, the magnetic flux generated by the stator windings hardly flows to the adjacent teeth 21b through the connecting portion 21d. In this way, the leakage flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding is reduced, so that the effective magnetic flux amount that contributes to the torque generation of the magnetic flux generated by the stator winding increases, and the rotation High torque of the electric machine can be realized.

Moreover, the expansion magnetic pole part 41a and the non-expansion magnetic pole part 42a are provided. Then, the density waveform generated at the non-expanded magnetic pole portion 42 a of the magnetic air gap 9 is smoother than the density waveform generated at the expanded magnetic pole portion 41 a of the magnetic air gap 9. Thereby, cogging torque and torque ripple can be reduced.
The cogging torque and torque ripple generated in the enlarged magnetic pole portion 41a of the magnetic gap 9 are offset with the cogging torque and torque ripple generated in the non-expanded magnetic pole portion 42a of the magnetic gap 9 to reduce the cogging torque and torque ripple. can do.
Since the enlarged magnetic pole part 41a is formed with the enlarged part 43 that narrows the radial width of the magnetic gap part 9, a reluctance torque is generated that attracts the enlarged part 43 and the stator core 21, thereby further improving the torque. Can be made.

  In the ninth embodiment, the expanded magnetic pole portion 41a and the non-expanded magnetic pole portion 42a are configured to contact one cylindrical surface having the center of the base portion 40a as the central axis, but the expanded magnetic pole portion 41a contacts. The diameter of the cylindrical surface may be larger than the diameter of the cylindrical surface with which the non-expanded magnetic pole part 42a is in contact.

  In the ninth embodiment, the outer peripheral surfaces of the enlarged magnetic pole portion 41a and the non-expanded magnetic pole portion 42a are formed in a smoothly curved surface that is convex outward in the radial direction. The surface is not limited to a smooth curved surface convex outward in the radial direction. That is, if the magnetic pole part of the rotor expansion core sheet has an expansion part with respect to the magnetic pole part of the rotor non-expansion core sheet, the outer peripheral surface of the magnetic pole part has a smooth curved surface that is radially outwardly convex. For example, the cross-sectional shape perpendicular to the rotation axis of the magnetic pole portion is a smooth wavy shape with irregularities in the circumferential direction, a polygonal shape in which a plurality of line segments are connected in the circumferential direction, a line segment and a curve. The shape may be alternately connected in the direction.

  In the ninth embodiment, the magnetic pole portion is configured by laminating the rotor expansion core sheet 50 and the rotor non-expansion core sheet 51 having different curvatures on the outer peripheral surface. Three or more kinds of rotor core pole pieces having different values may be stacked. In this case, a magnetic pole portion formed by laminating a rotor core sheet having an enlarged portion 43 whose outer peripheral shape is enlarged toward the magnetic gap portion 9 side with respect to other rotor core sheets becomes an enlarged magnetic pole portion. .

Embodiment 10 FIG.
32 is a perspective view showing a main part of a rotor in a rotary electric machine according to Embodiment 10 of the present invention, and FIG. 33 is a longitudinal sectional view showing the rotary electric machine according to Embodiment 10 of the present invention.

32 and FIG. 33, the rotor 10F has a rotor core 40A configured by alternately arranging the core expansion blocks 41 and the core non-expansion blocks 42 in the axial direction, and the axial position of the rotor core 40A. The rotating shaft 12 is inserted and fixed to the rotor core 40A, and a permanent magnet 13 'is embedded in the rotor core 40A.
The stator 20 </ b> E includes a stator core 21 </ b> E configured by alternately arranging iron core connection blocks 33 and iron core opening blocks 34 in the axial direction, and a stator winding 22. And the iron core connection block 33 is arrange | positioned so that it may correspond with the arrangement | positioning area | region of the iron core expansion block 41 regarding an axial direction.

  In the rotating electrical machine 108 configured as described above, the core expansion block 41 and the core non-expansion block 42 are alternately arranged in the axial direction, so that the magnetic flux density increase portion 35 of the magnetic gap 9 is the core expansion block. 41 is formed in the arrangement region. And the iron core connection block 33 is arrange | positioned so that it may correspond with the arrangement | positioning area | region of the iron core expansion block 41 regarding an axial direction. Therefore, the increased magnetic flux flows into the connecting portion 21d of the stator core 21E via the magnetic gap portion 9, so that the connecting portion 21d is magnetically saturated and the magnetic resistance of the connecting portion 21d increases. This makes it difficult for the magnetic flux generated by the stator winding 22 to flow to the adjacent teeth 21b through the connecting portion 21d. As described above, the leakage magnetic flux that does not contribute to the torque generation in the magnetic flux generated by the stator winding 22 is reduced, so that the effective magnetic flux amount contributing to the torque generation of the magnetic flux generated by the stator winding 22 increases. The torque of the rotating electrical machine can be increased.

In each of the above embodiments, the rotor core is manufactured by laminating the rotor core sheets punched from the electromagnetic steel sheet. However, the rotor core may be manufactured by a lump of magnetic material.
Further, in each of the above embodiments, the concentrated winding 14 poles and 18 slots and the concentrated winding 12 poles and 10 slots of the rotating electric machine have been described, but the number of poles of the rotating electric machine is not limited thereto.

Embodiment 11 FIG.
FIG. 34 is an explanatory diagram of an electric power steering apparatus for an automobile according to Embodiment 11 of the present invention.

  In FIG. 34, an electric power steering device 500 is equipped with an electric drive device 100 including the rotating electric machine 101 and the ECU unit 200 according to the first embodiment.

  When the driver steers a steering wheel (not shown), the torque is transmitted to the shaft 501 via a steering shaft (not shown). At this time, the torque transmitted to the shaft 501 is detected by the torque sensor 502, converted into an electrical signal, and transmitted to the ECU unit 200 via the cable (not shown) via the first connector 206 of the electric drive device 100. On the other hand, vehicle information such as vehicle speed is converted into an electrical signal and transmitted to the ECU unit 200 via the second connector 207. The ECU unit 200 calculates necessary assist torque from the torque and vehicle information such as vehicle speed, and supplies current to the rotating electrical machine 101 through the inverter.

  The rotating electrical machine 101 is arranged so that its axis is parallel to the moving direction 507 of the rack shaft. The power supply to the ECU unit 200 is sent from a battery or an alternator via a power connector 208. Torque generated by the rotating electrical machine 101 is decelerated by a gear box 503 incorporating a belt (not shown) and a ball screw (not shown), and a rack shaft (not shown) inside the housing 504 is moved in the direction of the arrow. The driving force is generated to assist the driver's steering force. Therefore, the tie rod 505 moves and the tire can be steered to turn the vehicle. Thus, the driver is assisted by the torque of the rotating electrical machine 101 and can turn the vehicle with a small steering force. The rack boot 506 is provided so that foreign matter does not enter the apparatus.

  In such an electric power steering apparatus 500, it is desirable that the electric drive apparatus 100 has a small size and a high output from the viewpoint of mounting on a vehicle and improvement in fuel consumption. Furthermore, from the viewpoint of driver comfort, the electric drive device 100 is desired to have low vibration and low noise.

  The rotating electrical machine 101 according to the first embodiment can improve the rigidity of the rotating electrical machine 101 while improving the torque. Therefore, it is possible to achieve both high torque, low vibration, and low noise, and the electric power steering apparatus 500. It is possible to achieve higher torque, lower vibration, and lower noise.

In the eleventh embodiment, the rotating electric machine 101 according to the first embodiment is incorporated into the electric drive device, but the same effect can be obtained even when the rotating electric machines according to the second to tenth embodiments are incorporated.
In addition, the electric power steering apparatus 500 in which the axis of the rotating electrical machine is arranged in a direction parallel to the rack shaft moving direction 507 is a system suitable for a large vehicle, but it is necessary to increase the output of the rotating electrical machine. . When the output of the rotating electrical machine is increased, vibration and noise caused by the rotating electrical machine also increase. However, since the electric power steering device using the rotating electrical machine according to the first to tenth embodiments can realize high torque, low vibration, and low noise, it can be applied to a large vehicle and can reduce fuel consumption. can get.

  9 Magnetic gap 10, 10, 10A, 10B, 10C, 10D, 10E, 10F Rotor, 11, 11A, 11B, 11C, 40, 40A Rotor core, 12 Rotating shaft, 13, 13 'Permanent magnet, 15th 2 permanent magnets, 16 magnetizing directions, 20, 20A, 20B, 20C, 20D, 20E stator, 21, 21A, 21B, 21C, 21D, 21E stator core, 21a core back, 21b teeth, 21c buttocks, 21d connecting part, 22, 22D stator winding, 31a stator core sheet, 33 core connecting block, 33a stator core sheet, 34 core opening block, 34a stator core sheet, 35 magnetic flux density increasing part, 36 stator core Sheet, 37 Stator core sheet, 43 Enlarged part, 50 Rotor expanded core sheet, 51 Rotor non-expanded core sheet , 100 electric drive device, 101,102,103,104,105,106,107,108 rotating electric machine, 500 electric power steering system.

Claims (9)

An annular core back, a plurality of teeth that protrude radially inward from the inner peripheral surface of the core back and are spaced apart from each other in the circumferential direction, and a periphery from the respective distal ends of the plurality of teeth A stator core having a flange projecting on both sides in the direction, and a stator having a stator winding mounted on the stator core;
A rotor core, a rotary shaft that passes through the axial center of the rotor core and is fixed to the rotor core, and a plurality of permanent magnets embedded in the rotor core; And a rotor arranged coaxially via a magnetic gap on the side,
The stator core has a core connecting block in which the first stator core sheets, in which the flanges adjacent in the circumferential direction are connected by a connection part, and the flanges adjacent in the circumferential direction are spaced apart from each other. Two core opening blocks laminated with a stator core sheet and laminated in the axial direction,
A magnetic flux density increasing portion is formed in a partial region in the axial direction of the magnetic gap portion,
At least a part of the arrangement area of the iron core connection block overlaps with the formation area of the magnetic flux density increasing portion in the axial direction ,
The ratio of the area where the iron core connection block arranged in the formation area of the magnetic flux density increasing portion occupies the axial direction with respect to the formation area of the magnetic flux density increasing portion is allocated to the area excluding the magnetic flux density increasing section. A rotating electrical machine in which an arrangement area of the provided iron core connection block is larger than a ratio in an axial direction with respect to an area excluding the magnetic flux density increasing portion . The permanent magnet protrudes axially outward from one axial end of the rotor core,
The magnetic flux density increasing portion, when the axial length of the magnetic gap is L, and the length from one end of the magnetic gap to the other end side in the axial direction is X, The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed in an axial region that satisfies X / L ≦ 0.325.   Le / W is 0.5 or more and 1.8 or less, where Le is the protrusion length of the permanent magnet from the rotor core and W is the magnet width in the magnetization direction of the permanent magnet. Item 2. The rotating electrical machine according to Item 2.   The rotating electrical machine according to claim 2, wherein an end face in the axial direction of the rotor core protrudes outward in the axial direction from an end face in the axial direction of the stator core. A second permanent magnet disposed on one end face of the rotor core in the axial direction and having the magnetization direction as the axial direction;
The magnetic flux density increasing portion, when the axial length of the magnetic gap is L, and the length from one end of the magnetic gap to the other end side in the axial direction is X, The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed in an axial region that satisfies X / L ≦ 0.325. The rotor core is manufactured by laminating a plurality of types of rotor core sheets having different outer peripheral surface shapes on the magnetic gap side,
The plurality of types of rotor core sheets are rotor-enlarged core sheets each having an enlarged portion whose outer peripheral surface shape is enlarged so as to reduce the radial width of the magnetic gap portion from the other rotor core sheets. Prepared,
The rotating electrical machine according to claim 1, wherein the magnetic flux density increasing portion is formed at an arrangement position in an axial direction of the rotor expansion core sheet. An annular core back, a plurality of teeth that protrude radially inward from the inner peripheral surface of the core back and are spaced apart from each other in the circumferential direction, and a periphery from the respective distal ends of the plurality of teeth A stator core having a flange projecting on both sides in the direction, and a stator having a stator winding mounted on the stator core;
A rotor core, a rotary shaft that passes through the axial center of the rotor core and is fixed to the rotor core, and a plurality of permanent magnets embedded in the rotor core; And a rotor arranged coaxially via a magnetic gap on the side,
The stator core has a core connecting block in which the first stator core sheets, in which the flanges adjacent in the circumferential direction are connected by a connection part, and the flanges adjacent in the circumferential direction are spaced apart from each other. Two core opening blocks laminated with a stator core sheet and laminated in the axial direction,
A magnetic flux density increasing portion is formed in a partial region in the axial direction of the magnetic gap portion,
At least a part of the arrangement area of the iron core connection block overlaps with the formation area of the magnetic flux density increasing portion in the axial direction,
The first stator core sheet disposed in the region of the magnetic flux density increasing portion relative to the total number of the first stator core sheet and the second stator core sheet disposed in the region of the magnetic flux density increasing portion. The ratio occupied by the number of sheets is disposed in a region excluding the magnetic flux density increasing portion with respect to the total number of the first stator core sheet and the second stator core sheet disposed in the region excluding the magnetic flux density increasing portion. magnitude not rotating electric machine than the ratio of the number of the first stator core sheets.   The rotating electrical machine according to any one of claims 1 to 7, wherein a radial width of the connecting portion is narrower than a minimum radial width of the magnetic gap portion.   An electric power steering apparatus equipped with the rotating electrical machine according to any one of claims 1 to 8.

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