JP2015096001A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of achieving high-speed rotation and capable of outputting high torque in a low-speed rotation region.SOLUTION: A rotor 4 includes first and second magnetic pole blocks 31, 32 alternately arranged adjacently in a peripheral direction. In the first magnetic pole block 31, two magnet magnetic pole portions 34 in each of which an S pole appears on the stator 3 side and a core magnetic pole portion 35 arranged between the two magnet magnetic pole portions 34 are formed. In the second magnetic pole block 32, two magnet magnetic pole portions 37 in each of which an N pole appears on the stator 3 side and a core magnetic pole portion 38 arranged between the two magnet magnetic pole portions 37 are formed. In the rotor core 22, first projections 39 each projected from the first magnetic pole block 31 in an axial direction and second projections 40 each projected from a radial-direction inside position of the second magnetic pole block 32, inner than the first projection 39, are formed. An auxiliary field magnet including an auxiliary coil and a york is arranged on the axial-direction one side of the rotor 4.

Description

  The present invention relates to a rotating electrical machine.

  2. Description of the Related Art Conventionally, some rotary electric machines include a so-called embedded magnet type rotor in which a permanent magnet that becomes a field magnet is embedded in a rotor core (for example, Patent Document 1). In a rotating electrical machine equipped with such an embedded magnet type rotor, not only magnet torque but also reluctance torque is generated, so that a so-called surface magnet type rotor in which a permanent magnet is fixed on the surface of the rotor core (for example, Patent Documents) Compared to 2), there is an advantage that a high torque can be obtained.

JP 2001-352702 A JP 2010-172195 A

  By the way, in the permanent magnet field type rotating electrical machine as described above, since the magnetic flux generated by the permanent magnet is substantially constant, the induced voltage (back electromotive voltage) generated in the stator coil is proportional to the rotational speed of the rotor. Become bigger. When this induced voltage reaches the upper limit of the power supply voltage, the rotor can no longer be rotated at a high speed. Therefore, in applications where high-speed rotation is required, it is conceivable to design the magnetic flux (interlinkage flux with respect to the coil) generated by a permanent magnet so that the rotor can sufficiently rotate at high speed. In this case, a sufficiently high torque cannot be obtained in the low speed rotation range. Therefore, there has been a demand for the development of a new technology that can rotate at a high speed and can output a high torque in a low-speed rotation range.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine that can rotate at a high speed and can output a high torque in a low-speed rotation region.

  A rotating electrical machine that solves the above problems includes a stator having a coil, and a rotor that is spaced radially from the stator, and the rotor is fixed to a rotating shaft so as to be integrally rotatable. In the rotor core and the embedded magnet fixed in a manner embedded in the rotor core and magnetized so that the same polarity is opposed in the circumferential direction, the rotor has a first polarity of the embedded magnet. A first magnetic pole block that is divided by being sandwiched between the magnetic poles from both sides in the circumferential direction; and a second magnetic pole block that is divided by being sandwiched between the magnetic poles of the second polarity of the embedded magnet from both sides in the circumferential direction. The first magnetic pole block includes two magnet magnetic pole portions each of which the second polarity appears on the stator side by fixing the first permanent magnet, and the two magnets. A core magnetic pole portion disposed between the net magnetic pole portions, and two magnet magnetic poles each having a first polarity on the stator side when a second permanent magnet is fixed to the second magnetic pole block. And a core magnetic pole portion disposed between the two magnet magnetic pole portions, the first magnetic pole block and the second magnetic pole block are arranged alternately adjacent to each other in the circumferential direction, The rotor core is provided with a first protrusion that protrudes from the first magnetic pole block to at least one side in the axial direction, and at least an axial direction from a position radially inward of the first magnetic pole block in the second magnetic pole block. A second protrusion protruding on one side is provided, and at least one side in the axial direction of the rotor is provided with an auxiliary coil wound in the circumferential direction and a magnetic flux generated by the auxiliary coil. An auxiliary magnetic field having a yoke is arranged, and the yoke has an outer magnetic pole portion facing the first projection in the axial direction, and an inner magnetic pole portion facing the second projection in the axial direction. The gist is that the gap is formed between the outer magnetic pole portion and the outer magnetic pole portion.

  According to the above configuration, when the magnetic flux is not supplied from the auxiliary field, the first polarity (for example, N pole) appears on the stator side of the core magnetic pole portion of the first magnetic pole block due to the magnetic flux generated by the embedded magnet, A second polarity (for example, S pole) appears on the stator side of the core magnetic pole portion of the second magnetic pole block. That is, since the core magnetic pole portion functions as a magnetic pole having the opposite polarity to each magnet magnetic pole portion of the same magnetic pole block, each of the first and second magnetic pole blocks functions as three magnetic poles.

  Here, when the first polarity appears in the outer magnetic pole part facing the first protrusion and the second polarity appears in the inner magnetic pole part facing the second protrusion by energization of the auxiliary coil, The magnetic flux supplied to the rotor via the first and second protrusions flows in the same direction as the magnetic flux produced by the embedded magnet between the stator and the core magnetic pole portion. On the other hand, when the second polarity appears in the outer magnetic pole portion facing the first protrusion and the first polarity appears in the inner magnetic pole portion facing the second protrusion, the auxiliary field passes through the first and second protrusions. Thus, the magnetic flux supplied to the rotor flows between the stator and the core magnetic pole portion in the opposite direction to the magnetic flux generated by the embedded magnet. Therefore, by adjusting the polarity appearing in the outer magnetic pole part and the inner magnetic pole part, the magnetic flux passing through between the stator and the core magnetic pole part (linkage magnetic flux with respect to the coil) can be adjusted. Then, it becomes possible to output a high torque.

  In the rotating electrical machine, the auxiliary field is included in the magnetic pole block having the same polarity of the core magnetic pole portion when the second polarity appears in the outer magnetic pole portion and the first polarity appears in the inner magnetic pole portion. It is preferable that an amount of magnetic flux that is the same as the polarity of each magnet magnetic pole portion to be supplied can be supplied.

  According to the above configuration, when the second polarity appears in the outer magnetic pole portion and the first polarity appears in the inner magnetic pole portion, the core magnetic pole portion functions as a magnetic pole having the same polarity as each magnet magnetic pole portion of the same magnetic pole block. Therefore, each of the first and second magnetic pole blocks functions as one magnetic pole. On the other hand, when the first polarity appears in the outer magnetic pole portion and the second polarity appears in the inner magnetic pole portion, and when no magnetic flux is supplied from the auxiliary field, the core magnetic pole portion Therefore, each of the first and second magnetic pole blocks functions as three magnetic poles. That is, in the above configuration, the number of magnetic poles of the rotor can be changed to the same or three times as the total number of the first and second magnetic pole blocks. Here, when the rotational speed of the rotor is the same, if the number of magnetic poles of the rotor is small, the time required for switching the magnetic poles facing the coils becomes long, and the amount of change in the interlinkage magnetic flux per unit time becomes small. Since the induced voltage is proportional to the amount of change in interlinkage magnetic flux per unit time, if the number of magnetic poles of the rotor is small, the induced voltage becomes small and the rotor can be sufficiently rotated at high speed.

In the above rotating electric machine, it is preferable that the auxiliary field has a variable magnet that is provided in the middle of the magnetic path of the magnetic flux generated by the auxiliary coil and is magnetized along the magnetic flux.
According to the above configuration, the polarity corresponding to the magnetization direction of the variable magnet appears in the outer magnetic pole part and the inner magnetic pole part. Further, by supplying a large current to the auxiliary coil to form a strong magnetic field, the variable magnet can be irreversibly demagnetized or magnetized, or the magnetization direction of the variable magnet can be changed. Thereby, even if it does not supply electric current to an auxiliary coil continuously, magnetic flux can be supplied from an auxiliary field to a rotor, and power saving can be achieved.

In the rotating electric machine, it is preferable that the variable magnet is formed in an annular shape and is juxtaposed with the auxiliary coil in the axial direction so as to sandwich the auxiliary coil with the rotor.
According to the above configuration, since the magnetic flux generated by the auxiliary coil enters and exits the rotor via the first and second protrusions, the portion close to the first and second protrusions in the magnetic path of the auxiliary coil (the outer magnetic pole portion and The magnetic flux passing through the inner magnetic pole portion is likely to concentrate at a position facing the first and second protrusions. That is, the magnetic flux density of the magnetic flux produced by the auxiliary coil is not uniform in the circumferential direction, and variation occurs. Therefore, for example, if the variable magnet is arranged in the vicinity of the outer magnetic pole part or the inner magnetic pole part, the degree of magnetization may vary when the magnetization direction of the variable magnet is changed by a strong magnetic field formed by the auxiliary coil. . On the other hand, in a portion of the magnetic path of the auxiliary coil that is away from the first and second protrusions, the magnetic flux is less likely to concentrate at a specific location. Therefore, by arranging the variable magnet so that the auxiliary coil is sandwiched between the variable magnet and the rotor as in the above configuration, and separating the variable magnet from the first and second protrusions, the degree of magnetization of the variable magnet Can be prevented from varying in the circumferential direction.

  In the rotating electrical machine, the rotor core is configured by laminating a plurality of electromagnetic steel plates, and the first magnetic pole block has a first insertion hole opened at least on one side in the axial direction. The second magnetic pole block is formed at a position facing the magnetic pole part, and the second magnetic pole block is formed with a second insertion hole opened at least on one side in the axial direction at a position facing the inner magnetic pole part, and the first protrusion Is formed by a rod-shaped first magnetic body that is inserted into the first insertion hole and has a smaller axial magnetic resistance than the axial magnetic resistance of the rotor core, and the second protrusion is formed in the second insertion hole. It is preferable that the rod-shaped second magnetic body is inserted and has a smaller axial magnetic resistance than the axial magnetic resistance of the rotor core.

  According to the said structure, since a rotor core is comprised with an electromagnetic steel plate, generation | occurrence | production of an eddy current can be suppressed. Here, in the rotor core formed by laminating electromagnetic steel plates, for example, the magnetic resistance in the axial direction is increased and the magnetic flux is less likely to flow in the axial direction in the rotor core as compared with a rotor core made of a cylindrical integrally formed product. Therefore, for example, the magnetic flux emitted from the auxiliary field is reduced at a position away from the auxiliary field in the rotor core, or the magnetic flux emitted from a portion away from the auxiliary field of the embedded magnet is less likely to be drawn into the auxiliary field. There is. As a result, the magnetic flux passing between the stator and the rotor may vary in the axial direction. In this respect, according to the above configuration, the magnetic flux easily passes through the rotor core in the axial direction by passing through the first and second magnetic bodies formed in the rod shape, so that the generation of eddy current is suppressed and the stator is suppressed. The magnetic flux passing between the rotor and the rotor can be prevented from varying in the axial direction.

  In the rotating electrical machine, the first protrusion is configured by a first magnetic body fixed at a position facing the outer magnetic pole portion on the shaft end surface of the rotor core, and the second protrusion is formed on the shaft end surface of the rotor core. It is preferable that the second magnetic body is fixed at a position facing the inner magnetic pole portion.

  According to the above configuration, the magnetic resistance in the radial direction of the first and second magnetic pole blocks is larger than when the insertion holes are formed in the first and second magnetic pole blocks and the magnetic material is inserted into the insertion holes. Can be suppressed.

  According to the present invention, the rotor can be rotated at a high speed and a high torque can be output in a low-speed rotation region.

Sectional drawing along the axial direction of the rotary electric machine of 1st Embodiment (BB sectional drawing of FIG. 2). (A) is sectional drawing (AA sectional drawing of FIG. 1) orthogonal to the axial direction of the rotary electric machine of 1st Embodiment, (b) is a fragmentary sectional view of the rotor of (a). (A) is a schematic diagram showing the flow of magnetic flux in a cross section along the axial direction of the rotor when the number of magnetic poles of the first embodiment is 12, and (b) is a cross section orthogonal to the axial direction of the rotor. The schematic diagram which shows the flow of magnetic flux. (A) is a schematic diagram showing the flow of magnetic flux in a cross section along the axial direction of the rotor when the number of magnetic poles in the first embodiment is four, and (b) is a cross section orthogonal to the axial direction of the rotor. The schematic diagram which shows the flow of magnetic flux. Sectional drawing along the axial direction of the rotary electric machine of 2nd Embodiment. The side view which looked at the rotor of 2nd Embodiment from the axial direction one end side. Sectional drawing along the axial direction of the rotary electric machine of 3rd Embodiment. (A), (b) is a fragmentary sectional view of an auxiliary field of another example. (A)-(c) is a fragmentary sectional view orthogonal to the axial direction of the rotor of another example.

(First embodiment)
Hereinafter, 1st Embodiment of a rotary electric machine is described according to drawing.
A rotating electrical machine (electric motor) 1 shown in FIG. 1 and FIGS. 2A and 2B is used as a driving source for traveling of an electric vehicle or a hybrid vehicle, for example. As shown in FIG. 1, the rotating electrical machine 1 includes a cylindrical housing 2, a stator 3 accommodated in the housing 2, and a rotor disposed on the radially inner side (inner peripheral side) of the stator 3 with a space therebetween. 4 and a control device 5 that generates a rotating magnetic field in the stator 3 through power supply. That is, the rotating electrical machine 1 of the present embodiment is configured as an inner rotor type radial gap motor.

  Specifically, the housing 2 includes a bottomed cylindrical housing body 7 that is open on one end side (right side in FIG. 1), and a disc-shaped cover 8 that is provided so as to close the opening end of the housing body 7. I have. An insertion hole 7b penetrating in the axial direction is formed at the center of the bottom 7a of the housing body 7, and an insertion hole 8a penetrating in the axial direction is formed at the center of the cover 8.

  The stator 3 includes a cylindrical cylindrical portion 11 fixed inside the cylindrical portion 7c of the housing main body 7, and a stator core 13 including a plurality of teeth 12 extending radially inward from the cylindrical portion 11 in the radial direction. Yes. The stator core 13 of the present embodiment has nine teeth 12 formed therein, and the number of slots formed between the teeth 12 is also nine. The stator core 13 is configured by laminating a plurality of electromagnetic steel plates such as silicon steel plates. Each tooth 12 is provided with a coil (armature coil) 15. The connection end 15 a of the coil 15 is drawn out of the housing 2 and connected to the control device 5.

  The rotor 4 includes a rotor core 22 fixed so as to be rotatable integrally with the rotary shaft 21, and a plurality of pairs (two pairs in this embodiment) of magnet pieces 23a as embedded magnets fixed in a manner embedded in the rotor core 22. 23b. That is, the rotor 4 of the present embodiment is configured as a so-called embedded magnet type rotor.

  More specifically, the rotating shaft 21 is formed in a columnar shape, and is rotatably supported via bearings 24 a and 24 b provided in the insertion hole 7 b of the bottom portion 7 a and the insertion hole 8 a of the cover 8. The rotary shaft 21 is made of a nonmagnetic material such as stainless steel. The rotor core 22 is formed in a columnar shape and is configured by laminating a plurality of electromagnetic steel plates 25. As shown in an enlarged view in FIG. 1, an insulating coating 25 a is provided on the surface of the electromagnetic steel sheet 25.

  The rotor core 22 is formed with a through-hole 26 penetrating in the axial direction in the center thereof. When the rotary shaft 21 is press-fitted into the through-hole 26, the rotor core 22 and the rotary shaft 21 are provided so as to be integrally rotatable. ing. The rotor core 22 is provided with a plurality of pairs of cavities 27a and 27b in which the magnet pieces 23a and 23b are disposed. The cavities 27a and 27b are formed in the shape of a hole having a rectangular cross section extending in the axial direction, and are formed so that the longitudinal direction of the rectangle formed by the cross section is along the radial line. In addition, bulging portions 28 having a substantially semicircular cross section that are continuous with the cavities 27a and 27b are formed on both radial sides of the cavities 27a and 27b.

  As the magnet pieces 23a and 23b, segment magnets made of ferrite-based sintered magnets, bonded magnets (for example, plastic magnets or rubber magnets) or the like are employed. The magnet pieces 23a and 23b are formed in a rectangular plate shape. The cross-sectional shape orthogonal to the axial direction of the rotor 4 in the magnet pieces 23a and 23b is a rectangular shape corresponding to the cross-sectional shape of the hollow portions 27a and 27b, and the magnet pieces 23a and 23b are in the hollow portions 27a and 27b. The rotor core 22 is fixed by being inserted. The bulging portion 28 functions as a so-called flux barrier that prevents the magnetic flux of the magnet pieces 23a and 23b from wrapping around. The magnet pieces 23a and 23b have the same polarity (N pole or S pole) in the circumferential direction, and the opposite polarities between the magnet pieces 23a and 23b are alternately opposite in the circumferential direction. Is magnetized (magnetized). As a result, the magnet piece 23a is opposed to the magnet piece 23b on one side in the circumferential direction with the N pole as the first polarity, and the magnet piece 23b on the other side in the circumferential direction is opposed to the S pole as the second polarity. doing. That is, the magnet piece 23a is magnetized so that not only the magnet piece 23b on one side in the circumferential direction but also the magnet piece 23b on the other side in the circumferential direction are opposed to each other. Each of the magnet pieces 23b adjacent to both sides in the circumferential direction constitutes a pair of magnet pieces.

  In the rotating electrical machine 1 configured as described above, when a three-phase driving current is supplied from the control device 5 to the coil 15, a rotating magnetic field is generated in the stator 3, and the rotor 4 rotates based on the rotating magnetic field. It is supposed to be.

(Rotor structure)
Here, the rotor 4 includes a plurality of (in this embodiment, two) first magnetic pole blocks 31 and magnet pieces 23a and 23b that are separated by being sandwiched between N poles of the magnet pieces 23a and 23b from both sides in the circumferential direction. A plurality of (in this embodiment, two) second magnetic pole blocks 32 that are separated by being sandwiched between the S poles from both sides in the circumferential direction. Two first permanent magnets 33 are fixed to the first magnetic pole block 31, so that two magnet magnetic pole portions 34 in which an S pole (second polarity) appears on the stator 3 side, and these magnet magnetic pole portions The core magnetic pole part 35 arrange | positioned between 34 is formed. On the other hand, by fixing the two second permanent magnets 36 to the second magnetic pole block 32, two magnet magnetic pole portions 37 in which the N pole (first polarity) appears on the stator 3 side, and these magnets A core magnetic pole portion 38 disposed between the magnetic pole portions 37 is formed. Further, the rotor core 22 has a first protrusion 39 protruding from the first magnetic pole block 31 toward one end side in the axial direction (right side in FIG. 1) and a position radially inward from the first protrusion 39 in the second magnetic pole block 32. A second protrusion 40 protruding toward one end in the axial direction is provided. Further, an auxiliary field SF is provided on one end side in the axial direction of the rotor 4 so as to be spaced from the rotor 4. The rotating electrical machine 1 adjusts the magnetic flux supplied from the auxiliary field SF to the rotor 4 via the first and second protrusions 39 and 40, thereby reducing the number of magnetic poles of the rotor 4 to the first and second magnetic pole blocks. It can be switched to the same or triple the total number of 31 and 32, that is, 4 or 12.

First, the configuration of the rotor will be described in detail.
As shown in FIGS. 2A and 2B, the first magnetic pole block 31 of the rotor core 22 is formed with two first cavities 41 in which the first permanent magnets 33 are arranged, and the second In the magnetic pole block 32, two second cavities 42 in which the second permanent magnets 36 are disposed are formed. Each of the first and second cavities 41 and 42 is formed in a hole shape having a rectangular cross section extending in the axial direction, and the longitudinal direction of the rectangular cross section is substantially orthogonal to the radial line passing through the center thereof. It is formed as follows. The first and second cavities 41 and 42 are provided close to the cavities 27a and 27b with a space in the circumferential direction. Further, in the rotor core 22 of the present embodiment, two gaps 43 are formed between the first and second cavities 41 and 42 with a space therebetween. The air gap 43 is formed in a groove shape penetrating in the axial direction and extending radially inward from the outer peripheral surface of the rotor core 22.

  As the first and second permanent magnets 33 and 36, segment magnets made of ferrite-based sintered magnets or bonded magnets are employed. The first and second permanent magnets 33 and 36 are each formed in a rectangular plate shape. A cross-sectional shape orthogonal to the axial direction of the rotor 4 in the first permanent magnet 33 is a rectangular shape corresponding to the cross-sectional shape of the first cavity portion 41, and the first permanent magnet 33 is inserted into the first cavity portion 41. As a result, the rotor core 22 is fixed. Similarly, the cross-sectional shape orthogonal to the axial direction of the rotor 4 in the second permanent magnet 36 is a rectangular shape corresponding to the cross-sectional shape of the second cavity 42, and the second permanent magnet 36 is in the second cavity 42. The rotor core 22 is fixed by being inserted into the rotor core 22. The first permanent magnet 33 is magnetized in the plate thickness direction (direction substantially along the radial direction of the rotor 4) so that the S pole appears on the outer peripheral side (stator 3 side), and the second permanent magnet 36 is It is magnetized in the thickness direction so that the N pole appears on the outer peripheral side. As a result, the south pole always appears at a portion facing the first cavity 41 on the outer peripheral surface of the rotor core 22, and the north pole always appears at a portion opposed to the second cavity 42.

  Therefore, the portion of the rotor core 22 where the first hollow portions 41 are formed functions as the magnetic pole portions 34 of the first magnetic pole block 31, and the portion between the two first hollow portions 41 serves as the core magnetic pole portion 35. Function. In addition, the portion where each second cavity portion 42 is formed in the rotor core 22 functions as each magnet magnetic pole portion 37 of the second magnetic pole block 32, and the portion between the two second cavity portions 42 is the core magnetic pole portion 38. Function. The first magnetic pole block 31 and the second magnetic pole block 32 are alternately arranged in the circumferential direction. The magnet magnetic pole portions 34 and 37 and the core magnetic pole portions 35 and 38 of the present embodiment extend over a circumferential range of approximately 30 °, and the first and second magnetic pole blocks 31 and 32 are substantially omitted. It extends over a 90 ° circumferential range.

  As shown in FIG. 1 and FIGS. 2A and 2B, a first insertion hole 51 penetrating in the axial direction is formed in the radially outer portion of the first magnetic pole block 31. A second insertion hole 52 penetrating in the axial direction is formed in the radially inner portion. The first and second insertion holes 51 and 52 are each formed in a rectangular cross section. The first insertion hole 51 is formed in a range where the core magnetic pole portion 35 is provided, and the second insertion hole 52 is formed across both the ranges where the magnet magnetic pole portions 37 and the core magnetic pole portion 38 are provided. ing. The radial range in which the first insertion hole 51 is formed and the radial range in which the second insertion hole 52 is formed are set so as not to overlap in the circumferential direction. The first insertion hole 51 and the second insertion hole 52 are formed so that their cross-sectional areas are substantially equal to each other.

  Long and rod-like first and second magnetic bodies 53 and 54 are inserted into the first and second insertion holes 51 and 52, respectively. The first magnetic body 53 is formed in a cross-sectional rectangle corresponding to the cross-sectional shape of the first insertion hole 51 and has a substantially constant cross-section over the entire axial direction thereof. On the other hand, the second magnetic body 54 is formed in a rectangular cross section corresponding to the cross sectional shape of the second insertion hole 52 and has a substantially constant cross section over the entire axial direction thereof. The first magnetic body 53 and the second magnetic body 54 are formed such that their cross-sectional areas are substantially equal to each other. In addition, the 1st and 2nd magnetic bodies 53 and 54 of this embodiment are comprised by laminating | stacking electromagnetic steel plates 55 and 56, such as a silicon steel plate, in the direction orthogonal to the lamination direction of the electromagnetic steel plates 25 which comprise the rotor core 22. FIG. ing. Thereby, the axial magnetic resistance of the first and second magnetic bodies 53 and 54 is smaller than the axial magnetic resistance of the rotor core 22. As shown in FIG. 1, the first and second magnetic bodies 53 and 54 are formed longer than the axial length of the rotor core 22, and one end portions 53 a and 53 a of the first and second magnetic bodies 53 and 54 are formed. 54 a protrudes from the axial end surface of the rotor core 22 toward one end in the axial direction. Thereby, the one end portion 53 a of the first magnetic body 53 functions as the first protrusion 39, and the one end portion 54 a of the second magnetic body 54 functions as the second protrusion 40.

Next, the structure of the auxiliary field will be described in detail.
The auxiliary field SF is provided in the middle of the auxiliary coil 61 formed by winding a conducting wire in the circumferential direction, the yoke 62 serving as the magnetic path of the magnetic flux generated by the auxiliary coil 61, and the magnetic path of the magnetic flux generated by the auxiliary coil 61. The variable magnet 63 is provided. The yoke 62 is formed with an outer magnetic pole portion 64 that faces the first protrusion 39 in the axial direction, and an inner magnetic pole portion 65 that faces the second protrusion 40 in the axial direction is between the outer magnetic pole portion 64. It is formed with an annular gap G interposed.

  Specifically, the yoke 62 includes a cylindrical outer member 71 and a cylindrical inner member 72 disposed on the inner periphery of the outer member 71. In addition, the outer member 71 and the inner member 72 are comprised with the powder magnetic core. An annular fixing flange 73 extending radially inward is formed at one end of the outer member 71 (the end opposite to the rotor 4), and the other end of the outer member 71 (on the rotor 4 side). At the end), an annular opposing flange portion 74 extending radially inward is formed. The outer member 71 is disposed coaxially with the rotor 4 and is fixed to the inner side of the cover 8 so that the opposed flange portion 74 faces the first protrusion 39 in the axial direction. Thereby, the opposing flange portion 74 functions as the outer magnetic pole portion 64.

  On the other hand, an annular fixed flange portion 75 extending outward in the radial direction is formed at one end portion of the inner member 72, and an annular shape extending outward in the radial direction is formed at the other end portion of the inner member 72. The opposite flange portion 76 is formed. The inner member 72 is disposed coaxially with the rotor 4 and is fixed to the inner side of the cover 8 so that the opposing flange portion 76 faces the second protrusion 40 in the axial direction. Thereby, the opposing flange portion 76 functions as the inner magnetic pole portion 65.

  The outer member 71 and the inner member 72 are radially arranged so that the gap G is formed between the opposed flange portion 74 (outer magnetic pole portion 64) and the opposed flange portion 76 (inner magnetic pole portion 65). It is fixed to the cover 8 with an interval. The radial width of the gap G is set to be larger than both the axial distance between the opposing flange portion 74 and the first protrusion 39 and the axial distance between the opposing flange portion 76 and the second protrusion 40. Has been. As a result, the magnetic flux passing through the outer magnetic pole portion 64 mainly enters and exits the first magnetic pole block 31 of the rotor core 22 via the first protrusion 39, and the magnetic flux passing through the inner magnetic pole portion 65 mainly passes through the second protrusion 40. The second magnetic pole block 32 is moved in and out.

  The auxiliary coil 61 is formed in an annular shape. The auxiliary coil 61 is fixed so as to be disposed coaxially with the rotor 4 between the axial central portion of the outer member 71 and the axial central portion of the inner member 72. Thereby, the magnetic path of the magnetic flux generated by the auxiliary coil 61 includes the yoke 62 (the outer member 71 and the inner member 72). Note that the connection end 61 a of the auxiliary coil 61 is drawn out of the housing 2 and connected to the control device 5. Further, as the conducting wire of the auxiliary coil 61, a wire having a larger diameter than the conducting wire of the coil 15 is used.

  The variable magnet 63 employs a ring magnet having a smaller coercive force than the magnet pieces 23a and 23b and the first and second permanent magnets 33 and 36, such as a samarium-cobalt sintered magnet. The variable magnet 63 is formed in an annular shape. The variable magnet 63 is fixed between the fixed flange portion 73 of the outer member 71 and the fixed flange portion 75 of the inner member 72. Thereby, the variable magnet 63 is juxtaposed with the auxiliary coil 61 in the axial direction so that the auxiliary coil 61 is sandwiched between the variable magnet 63 and the rotor 4. The variable magnet 63 and the fixed flange portions 73 and 75 are in close contact with each other.

  The variable magnet 63 is magnetized (magnetized) in a direction along the magnetic flux created by the auxiliary coil 61 (in this embodiment, the radial direction). The variable magnet 63 is irreversibly demagnetized or magnetized or changed in magnetization direction when a large current is supplied from the control device 5 to the auxiliary coil 61 to form a strong magnetic field. And the polarity according to the magnetization direction of the variable magnet 63 appears in the opposing flange part 74 used as the outer side magnetic pole part 64, and the opposing flange part 76 used as the inner side magnetic pole part 65. In the variable magnet 63, when the south pole appears in the outer magnetic pole portion 64 and the north pole appears in the inner magnetic pole portion 65 as will be described later, the core magnetic pole portions 35 and 38 have the same polarity. A magnet that can be magnetized to such an extent that a magnetic flux of an amount that is the same as the polarity of each of the magnetic pole portions 34 and 37 can be supplied to the rotor 4 is used.

Next, the number of magnetic poles of the rotor will be described in detail. In the drawing, the magnetization direction of the magnet is indicated by a thick arrow, and the flow of magnetic flux is indicated by a broken arrow.
As shown in FIG. 3, when the magnetization direction of the variable magnet 63 is adjusted so that the N pole appears in the outer magnetic pole portion 64 and the S pole appears in the inner magnetic pole portion 65, the number of magnetic poles of the rotor 4 is the first and first. This is three times the total number of the two magnetic pole blocks 31 and 32. Even when no magnetic flux is supplied from the auxiliary field SF, the number of magnetic poles of the rotor 4 is three times the total number of the first and second magnetic pole blocks 31 and 32. On the other hand, as shown in FIG. 4, when the S pole appears in the outer magnetic pole portion 64 and the N pole appears in the inner magnetic pole portion 65, the magnetic poles of the magnetic pole blocks 31 and 32 having the same polarity of the core magnetic pole portions 35 and 38. By magnetizing the variable magnet 63 to a strength that can supply the rotor 4 with an amount of magnetic flux that is the same as the polarity of the portions 34 and 37, the number of magnetic poles of the rotor 4 is changed to the first and second magnetic pole blocks 31 and 32. Is the same as the total number of

  Specifically, as shown in FIGS. 3A and 3B, when the N pole appears in the outer magnetic pole portion 64 and the S pole appears in the inner magnetic pole portion 65, the first and second protrusions 39 from the auxiliary field SF. , 40, the magnetic flux supplied to the rotor 4 is the same as the magnetic flux produced by the magnet pieces 23a, 23b and the first and second permanent magnets 33, 36 between the stator 3 and the core magnetic pole portions 35, 38. To flow in the direction. Thereby, on the stator 3 side of the core magnetic pole portions 35, 38 of the first and second magnetic pole blocks 31, 32, the opposite polarity to the magnet magnetic pole portions 34, 37 of the same magnetic pole block 31, 32 appears, The second magnetic pole blocks 31 and 32 each function as three magnetic poles.

  More specifically, for example, in the first magnetic pole block 31 having the S magnetic pole portions 34 at the upper left in FIG. 3B, a part of the magnetic flux emitted from the N poles of the magnet pieces 23a and 23b, the first permanent magnet 33. A part of the magnetic flux emitted from the N pole of the magnetic field and a part of the magnetic flux emitted from the auxiliary field SF through the first magnetic body 53 (first protrusion 39) flow out from the outer peripheral surface of the core magnetic pole portion 35 to the stator 3 side. Thus, the core magnetic pole portion 35 functions as an N pole. Thereby, different polarities appear in each magnet magnetic pole part 34 and core magnetic pole part 35 of the first magnetic pole block 31, and the first magnetic pole block 31 functions as three magnetic poles. Further, for example, in the second magnetic pole block 32 having the N magnetic pole portions 37 at the upper right in FIG. 3B, a part of the magnetic flux entering the S pole of the magnet pieces 23a, 23b, the S of the second permanent magnet 36. A part of the magnetic flux entering the pole and a part of the magnetic flux entering the auxiliary field SF via the second magnetic body 54 (second protrusion 40) flow from the outer peripheral surface of the core magnetic pole portion 38, and the core. The magnetic pole part 38 functions as an S pole. Thereby, different polarities appear in each magnet magnetic pole part 37 and core magnetic pole part 38 of the second magnetic pole block 32, and the second magnetic pole block 32 functions as three magnetic poles. Therefore, the number of magnetic poles of the rotor 4 is three times the total number of the first and second magnetic pole blocks 31 and 32.

  If no magnetic flux is supplied from the auxiliary field SF, the magnetic flux passing between the stator 3 and the core magnetic pole portions 35 and 38 appears in the outer magnetic pole portion 64 and in the inner magnetic pole portion 65. It flows in the same way as when the S pole appears.

  On the other hand, as shown in FIGS. 4A and 4B, when the S pole appears in the outer magnetic pole portion 64 and the N pole appears in the inner magnetic pole portion 65, the first and second protrusions 39, The magnetic flux supplied to the rotor 4 via 40 flows between the stator 3 and the core magnetic pole portions 35 and 38 in the opposite direction to the magnetic flux generated by the magnet pieces 23a and 23b. As a result, the same polarity as the magnet magnetic pole portions 34 and 37 of the same magnetic pole blocks 31 and 32 appears on the stator 3 side of the core magnetic pole portions 35 and 38 of the first and second magnetic pole blocks 31 and 32, and the first Each of the second magnetic pole blocks 31 and 32 functions as one magnetic pole.

  More specifically, for example, in the first magnetic pole block 31 having the S magnetic pole portions 34 of the upper left in FIG. 4B, the outer magnetic pole portion 64 of the auxiliary field SF has N poles of the magnet pieces 23a and 23b. Part of the magnetic flux emitted from the first magnetic pole 53, part of the magnetic flux emitted from the north pole of the first permanent magnet 33, and the magnetic flux flowing from the stator 3 side through the outer peripheral surface of the core magnetic pole portion 35 are the first magnetic body 53 (first protrusion 39). ) And the core magnetic pole portion 35 functions as an S pole. Thereby, the same polarity appears in each magnet magnetic pole part 34 and core magnetic pole part 35 of the 1st magnetic pole block 31, and this 1st magnetic pole block 31 functions as one magnetic pole. For example, in the second magnetic pole block 32 having the N magnetic pole portions 37 at the upper right in FIG. 4B, the second magnetic body 54 (second protrusion 40) is formed from the inner magnetic pole portion 65 of the auxiliary field SF. Part of the magnetic flux entered through the magnetic poles 23a and 23b enters the S pole of the magnet pieces 23a and 23b and the second permanent magnet 36, and the other part flows out from the outer peripheral surface of the core magnetic pole portion 38 to the stator 3 side. Thus, the core magnetic pole portion 38 functions as an N pole. Thereby, the same polarity appears in each magnet magnetic pole part 37 and core magnetic pole part 38 of the 2nd magnetic pole block 32, and this 2nd magnetic pole block 32 functions as one magnetic pole. Therefore, the number of magnetic poles of the rotor 4 is the same as the total number of the first and second magnetic pole blocks 31 and 32.

As described above, according to the present embodiment, the following operational effects can be achieved.
(1) The number of magnetic poles of the rotor 4 can be changed to 4 or 12 according to the magnetic flux supplied from the auxiliary field SF. Here, when the rotational speed of the rotor 4 is the same, if the number of magnetic poles of the rotor 4 is small, the time required for switching the polarity of the magnetic poles facing the coil 15 becomes long, and the amount of change in the interlinkage magnetic flux per unit time is increased. Get smaller. Since the induced voltage is proportional to the amount of change in the flux linkage per unit time, if the number of magnetic poles of the rotor 4 is small, the induced voltage becomes small and high-speed rotation is possible. That is, even if the design is such that a high torque can be output with the number of magnetic poles of the rotor 4 increased, the rotor 4 can be rotated at a high speed with the number of magnetic poles of the rotor 4 reduced. Therefore, the rotor 4 can be rotated at a high speed and a high torque can be output in a low-speed rotation range.

  (2) When the number of slots is 9 and the number of magnetic poles of the rotor 4 is 12, the winding coefficient indicating the effectiveness of the magnetic flux linked to the coil 15 is relatively high (a value close to “1”). Therefore, in this embodiment, the rotating electrical machine 1 can be driven efficiently. Further, when the number of magnetic poles of the rotor 4 is four with respect to the number of slots of nine, the winding coefficient becomes a relatively small value, so that it can be suitably rotated at high speed.

  (3) Since the variable magnet 63 magnetized along the magnetic flux generated by the auxiliary coil 61 is provided in the auxiliary field SF, the rotor from the auxiliary field SF does not have to be supplied with current continuously. The magnetic flux can be supplied to 4, and power saving can be achieved.

(4) The variable magnet 63 was formed in an annular shape, and the auxiliary coil 61 was juxtaposed with the auxiliary coil 61 in the axial direction so as to be sandwiched between the rotor 4.
Here, since the magnetic flux generated by the auxiliary coil 61 enters and exits the rotor 4 via the first and second protrusions 39 and 40, it approaches the first and second protrusions 39 and 40 in the magnetic path of the auxiliary coil 61. The magnetic flux passing through the portions (the outer magnetic pole part 64 and the inner magnetic pole part 65) is likely to concentrate at a position facing the first and second protrusions 39 and 40. That is, the magnetic flux density of the magnetic flux generated by the auxiliary coil 61 is not uniform in the circumferential direction, and variation occurs. Therefore, for example, when the variable magnet 63 is arranged in the vicinity of the outer magnetic pole part 64 or the inner magnetic pole part 65, the degree of magnetization varies when the magnetization direction of the variable magnet 63 is changed by a strong magnetic field formed by the auxiliary coil 61. May occur. On the other hand, in the portion of the magnetic path of the auxiliary coil 61 that is away from the first and second protrusions 39 and 40, the magnetic flux is less likely to concentrate at a specific location. Therefore, the variable magnet 63 is arranged so that the auxiliary coil 61 is sandwiched between the variable magnet 63 and the rotor 4 as in this embodiment, and the variable magnet 63 is separated from the first and second protrusions 39 and 40. Thus, it is possible to suppress the degree of magnetization of the variable magnet 63 from varying in the circumferential direction.

  (5) Since the rotor core 22 is configured by laminating a plurality of electromagnetic steel plates 25 in the axial direction, generation of eddy current can be suppressed. However, in the rotor core 22 formed by laminating the electromagnetic steel plates 25 as described above, the magnetic resistance in the axial direction is larger than the magnetic resistance in the radial direction, so that the magnetic flux hardly flows in the axial direction in the rotor core 22. Therefore, for example, at the position away from the auxiliary field SF in the rotor core 22, the magnetic flux emitted from the auxiliary field SF decreases, or the magnetic flux emitted from a part away from the auxiliary field SF of the magnet pieces 23 a and 23 b becomes the auxiliary field magnet. It may be difficult to be drawn into the SF. As a result, the magnetic flux passing between the stator 3 and the rotor 4 may vary in the axial direction. In this respect, in the present embodiment, the first and second protrusions 39 and 40 have one end of the rod-shaped first and second magnetic bodies 53 and 54 having a smaller axial magnetic resistance than the axial magnetic resistance of the rotor core 22. Each of the parts 53a and 54a is configured. Accordingly, since the magnetic flux passes through the first and second magnetic bodies 53 and 54 and easily flows in the rotor core 22 in the axial direction, the magnetic flux passing between the stator 3 and the rotor 4 varies in the axial direction. Can be suppressed.

  (6) The first protrusions 39 and the second protrusions 40 are formed so that the cross-sectional areas orthogonal to the axial direction are equal to each other. Here, since the first and second protrusions 39 and 40 are magnetic paths of magnetic fluxes formed by the auxiliary field SF, respectively, only the cross-sectional area of one of the first and second protrusions 39 and 40 is increased, for example. Even when the other cross-sectional area is small and the magnetic resistance is large, the magnetic flux passing between the auxiliary field SF and the rotor 4 does not increase. Therefore, the magnetic flux passing between the auxiliary field SF and the rotor 4 can be efficiently increased by making the cross-sectional areas of the first and second protrusions 39 and 40 equal to each other as in the present embodiment. .

  (7) Each magnet piece 23a, 23b was formed in a flat plate shape and arranged radially with respect to the rotor core 22, and magnetized so that the same polarity was opposed in the circumferential direction. For this reason, the first and second magnetic pole blocks 31 and 32 can be formed in a wide shape in the radial direction, and the areas of the first and second magnetic pole blocks 31 and 32 as viewed from the axial direction can be increased. Thereby, the cross-sectional areas of the first and second protrusions 39 and 40 can be increased, and the magnetic flux passing between the auxiliary field SF and the rotor 4 can be further increased.

(Second Embodiment)
Next, a second embodiment will be described with reference to the drawings. The main difference between this embodiment and the first embodiment is the configuration of the first and second protrusions. For this reason, for convenience of explanation, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  As shown in FIGS. 5 and 6, a short rod-shaped first magnetic body 81 is disposed on the axial end surface of the first magnetic pole block 31 on one axial end side at a position facing the outer magnetic pole portion 64 in the axial direction. A short rod-shaped second magnetic body 82 is disposed at a position facing the inner magnetic pole portion 65 in the axial direction on the axial end surface on one axial end side of the second magnetic pole block 32. Thereby, the first magnetic body 81 functions as the first protrusion 39 and the second magnetic body 82 functions as the second protrusion 40.

  Specifically, the cross-sectional shapes perpendicular to the axial direction of the first and second magnetic bodies 81 and 82 are each substantially fan-shaped, and the cross-sections are formed substantially constant over the entire axial direction. The first magnetic body 81 and the second magnetic body 82 are formed so that their cross-sectional areas are substantially equal to each other. In addition, the 1st and 2nd magnetic bodies 81 and 82 of this embodiment are comprised by the powder magnetic core. The first and second magnetic bodies 81 and 82 are fixed by a holder 83 that is fixed to the axial end surface of the rotor core 22 on one end side in the axial direction.

  The holder 83 is formed in a disc shape, and a through hole 84 through which the rotary shaft 21 is inserted is formed in the center of the holder 83. In addition, the holder 83 is formed with fitting holes 85 and 86 for fitting them at positions corresponding to the first and second magnetic bodies 81 and 82. The holder 83 is fixed to the rotor core 22 with an adhesive or the like. Note that the holder 83 of the present embodiment is made of a resin material.

  In the rotating electrical machine 1 of the present embodiment, the polarity appearing at the outer magnetic pole part 64 and the inner magnetic pole part 65 is changed by changing the magnetization direction of the variable magnet 63 as in the first embodiment, and the auxiliary field SF is changed. The number of magnetic poles of the rotor 4 changes to be the same as or triples the total number of the first and second magnetic pole blocks 31 and 32 by the magnetic flux generated in step 1 entering and exiting the rotor 4 via the first and second protrusions 39 and 40. To do.

As described above, according to the present embodiment, the following functions and effects are provided in addition to the functions and effects (1) to (4), (6), and (7) of the first embodiment.
(8) The first protrusion 39 is configured by the first magnetic body 81 fixed at a position facing the outer magnetic pole portion 64 on the shaft end surface of the first magnetic pole block 31, and the second protrusion 40 is formed by the axis of the second magnetic pole block 32. The second magnetic body 82 is fixed at a position facing the inner magnetic pole portion 65 on the end face. Therefore, as compared with the case where the magnetic body is inserted into the insertion holes formed in the first and second magnetic pole blocks 31 and 32 as in the first embodiment, the radial direction of the first and second magnetic pole blocks 31 and 32 is increased. An increase in magnetic resistance can be suppressed.

  (9) Since the first and second magnetic bodies 81 and 82 are fixed to the rotor core 22 by the holder 83, the first and second magnetic bodies 81 and 82 are fixed to the rotor core 22 by using an adhesive or the like, for example. And the magnetic resistance between the 2nd magnetic bodies 81 and 82 and the rotor core 22 can be made small.

(Third embodiment)
Next, a third embodiment will be described with reference to the drawings. The main difference between the present embodiment and the first embodiment is the configuration of the auxiliary field. For this reason, for convenience of explanation, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  As shown in FIG. 7, the auxiliary field SF of the present embodiment includes an auxiliary coil 61 and a yoke 62, and does not include a variable magnet 63. Further, the fixed flange portion 73 of the outer member 71 of the yoke 62 and the fixed flange portion 75 of the inner member 72 are in close contact with each other. In the auxiliary coil 61, when the S pole appears in the outer magnetic pole portion 64 and the N pole appears in the inner magnetic pole portion 65, the magnet magnetic pole portions of the magnetic pole blocks 31, 32 having the same polarity of the core magnetic pole portions 35, 38 are provided. What can flow the electric current which can generate | occur | produce the quantity of magnetic flux which becomes the same as the polarity of 34,37 is used.

  In the auxiliary field SF configured as described above, the polarity corresponding to the energization direction to the auxiliary coil 61 appears in the outer magnetic pole part 64 and the inner magnetic pole part 65. Similarly to the first embodiment, when the S pole appears in the outer magnetic pole part 64 and the N pole appears in the inner magnetic pole part 65, the core magnetic pole parts 35 and 38 have the same polarity. By generating an amount of magnetic flux that is the same as the polarity of each magnet magnetic pole portion 34, 37, the number of magnetic poles of the rotor 4 changes to be the same as or triple the total number of first and second magnetic pole blocks 31, 32. .

As described above, according to the present embodiment, the same operational effects as (1), (2), (5) to (7) of the first embodiment can be obtained.
In addition, the said embodiment can also be implemented in the following aspects which changed this suitably.

  In the first and second embodiments, the auxiliary coil 61 and the variable magnet 63 are juxtaposed in the axial direction so that the auxiliary coil 61 is sandwiched between the rotor 4 and the variable magnet 63. However, the present invention is not limited to this. For example, as shown in FIG. 8A, the variable magnet 63 is fixed to the outer peripheral side of the auxiliary coil 61, or as shown in FIG. It may be fixed to the inner peripheral side of 61. Furthermore, the variable magnet 63 may be fixed to the yoke 62 so as to face the first protrusion 39 or the second protrusion 40. In this case, the variable magnet 63 is configured as the outer magnetic pole part 64 or the inner magnetic pole part 65.

  In the first and third embodiments, the first and second magnetic bodies 53 and 54 are configured by stacking the electromagnetic steel plates 55 and 56 in a direction orthogonal to the stacking direction of the electromagnetic steel plates 25 constituting the rotor core 22. However, the magnetic resistance in the axial direction may be smaller than the magnetic resistance in the axial direction of the rotor core 22, and may be constituted by, for example, a dust core.

  In the second embodiment, the first and second magnetic bodies 81 and 82 are fixed to the rotor core 22 by the holder 83. However, the present invention is not limited to this. For example, the first and second magnetic bodies 81 and 82 are bonded by an adhesive or the like. It may be fixed to the rotor core 22.

  In each of the above embodiments, a plurality of pairs of magnet pieces 23a and 23b are arranged radially, and the magnet pieces 23a constitute a pair of magnet pieces with each of the magnet pieces 23b adjacent to both sides in the circumferential direction. However, the present invention is not limited to this. For example, as shown in FIG. 9A, the longitudinal direction of the rectangle formed by each cross section of the magnet piece 23a and the magnet piece 23b is inclined in the opposite direction to the radial direction. It may be arranged so that the magnet piece 23a constitutes a pair of magnet pieces only with the magnet piece 23b adjacent to one side in the circumferential direction.

  Further, the embedded magnet may be formed of a single member instead of the pair of magnet pieces. For example, as shown in FIG. 9B, the embedded magnet 91 is protruded radially inward. You may form in circular arc shape. In this case, the rotating shaft 21 may be made of a magnetic material.

  In short, the embedded magnets have the same polarity in the circumferential direction, and the first protrusion 39 protruding from the first magnetic pole block 31 and the second protrusion 40 protruding from the second magnetic pole block 32 do not overlap in the circumferential direction. If it can be provided, the shape, arrangement, etc. can be changed as appropriate.

  In each of the above embodiments, the first and second permanent magnets 33 and 36 are fixed in such a manner that they are embedded in the first and second cavities 41 and 42 of the rotor core 22, respectively. ), The first and second permanent magnets 33 and 36 may be respectively fixed to the surface of the rotor core 22. In this case, the first and second permanent magnets 33 and 36 themselves function as the magnet magnetic pole portions 34 and 37, respectively.

  In each of the above embodiments, ferrite-based sintered magnets and bonded magnets are used for the magnet pieces 23a and 23b and the first and second permanent magnets 33 and 36. However, the present invention is not limited to this. For example, neodymium-based sintered magnets Other magnets may be used. Similarly, a magnet other than a samarium-cobalt sintered magnet may be used as the variable magnet 63.

  In each of the above embodiments, the rotor core 22 is provided with the first and second protrusions 39 and 40 protruding from the first and second magnetic pole blocks 31 and 32 in the axial direction, and the auxiliary field SF is disposed in the axial direction of the rotor 4. It may be provided on both sides.

In each of the above embodiments, the first polarity may be the S pole and the second polarity may be the N pole.
In each embodiment described above, the cross-sectional area of the first protrusion 39 and the cross-sectional area of the second protrusion 40 may be different from each other.

In each of the above embodiments, the outer member 71, the inner member 72, the first magnetic body 81, and the second magnetic body 82 are configured by a dust core, but, for example, low carbon steel or the like may be used.
In each of the above embodiments, the air gap 43 may not be formed in the rotor core 22.

  In each of the above embodiments, the number of slots of the stator 3 is nine and the number of magnetic poles of the rotor 4 can be changed to four or twelve, but this is not limiting, and the number of slots and the number of magnetic poles can be changed as appropriate. is there.

In each of the above embodiments, the rotary electric machine 1 is an inner rotor type radial gap motor, but is not limited thereto, and may be an outer rotor type radial gap motor.
In each of the above embodiments, when the S pole appears at the outer magnetic pole portion 64 and the N pole appears at the inner magnetic pole portion 65, the magnet magnetic pole portions 34 of the magnetic pole blocks 31, 32 having the same polarity of the core magnetic pole portions 35, 38. The auxiliary field SF is configured to be able to supply the rotor 4 with an amount of magnetic flux that has the same polarity as the. However, the present invention is not limited to this, and when the auxiliary magnetic field SF has an S pole at the outer magnetic pole portion 64 and an N pole at the inner magnetic pole portion 65, the magnetic pole blocks 31, 32 have the same polarity of the core magnetic pole portions 35, 38. The magnetic pole portions 34 and 37 may be configured to be able to supply only an amount of magnetic flux that remains opposite to the polarity. Even in this case, when the S pole appears in the outer magnetic pole portion 64 and the N pole appears in the inner magnetic pole portion 65, the magnetic flux supplied from the auxiliary field SF to the rotor 4 is between the stator 3 and the core magnetic pole portions 35 and 38. It flows in the opposite direction to the magnetic flux produced by the magnet pieces 23a and 23b. Therefore, when the N pole appears in the outer magnetic pole part 64 and the S pole appears in the inner magnetic pole part 65, and when the magnetic flux is not supplied from the auxiliary field SF, the gap between the stator 3 and the core magnetic pole parts 35 and 38 is increased. The magnetic flux passing through decreases. As a result, the induced voltage can be kept small, and the rotor 4 can be rotated at a high speed.

  In each of the above embodiments, the rotating electrical machine 1 is used as a drive source for an electric vehicle or a hybrid vehicle. However, the present invention is not limited thereto, and may be used as a drive source for other devices such as an electric power steering device. It may be used as a generator. Note that the rotating electrical machine that generates the magnetic flux of the auxiliary field SF by the variable magnet 63 as in the first and second embodiments may be applied to a use in which a state in which a large torque is output or a state in which high-speed rotation continues. preferable. Moreover, it is preferable to apply the rotary electric machine which produces | generates the magnetic flux of auxiliary field SF by the auxiliary coil 61 like the said 3rd Embodiment to the use where the state which outputs a big torque, or the state which rotates at high speed changes frequently.

Next, technical ideas that can be understood from the above embodiments and other examples will be described below together with their effects.
(A) The rotating electrical machine characterized in that the first protrusion and the second protrusion are formed so that cross-sectional areas perpendicular to the axial direction are equal to each other. Here, since the first and second protrusions are magnetic paths of the magnetic flux generated by the auxiliary field, for example, even if only the cross-sectional area of one of the first and second protrusions is increased, When the cross-sectional area is small and the magnetic resistance is large, the magnetic flux passing between the auxiliary field and the rotor does not increase. Therefore, the magnetic flux passing between the auxiliary field and the rotor can be efficiently increased by making the cross-sectional areas of the first and second protrusions equal to each other as in the above configuration.

  (B) The embedded magnet includes a pair of magnet pieces formed in a plate shape, and the magnet pieces are arranged radially with respect to the rotor core so that the same polarity is opposed in the circumferential direction. A rotating electrical machine characterized by being magnetized. According to the above configuration, the first and second magnetic pole blocks have a shape that extends over a wide range in the radial direction, and the areas of the first and second magnetic pole blocks viewed from the axial direction can be increased. And the cross-sectional area of each of the second protrusions can be increased, and the magnetic flux passing between the auxiliary field and the rotor can be further increased.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 3 ... Stator, 4 ... Rotor, 15 ... Coil, 21 ... Rotating shaft, 22 ... Rotor core, 23a, 23b ... Magnet piece, 25, 55, 56 ... Electromagnetic steel plate, 31 ... 1st magnetic pole block, 32 ... 2nd magnetic pole block, 33 ... 1st permanent magnet, 34, 37 ... Magnet magnetic pole part, 35, 38 ... Core magnetic pole part, 36 ... 2nd permanent magnet, 39 ... 1st protrusion, 40 ... 2nd protrusion, 51 ... 1st insertion hole, 52 ... 2nd insertion hole, 53, 81 ... 1st magnetic body, 54, 82 ... 2nd magnetic body, 61 ... Auxiliary coil, 62 ... Yoke, 63 ... Variable magnet, 64 ... Outer magnetic pole part, 65 ... Inner magnetic pole part, 73, 75 ... Fixed flange part, 74, 76 ... Opposing flange part, 91 ... Embedded magnet, G ... Gap, SF ... Auxiliary field.

Claims (6)

A stator having a coil;
A rotor disposed at a radial interval between the stator and the stator,
In the rotating electrical machine, the rotor includes a rotor core that is fixed to a rotating shaft so as to be integrally rotatable, and an embedded magnet that is fixed in a manner embedded in the rotor core and magnetized so that the same polarity is opposed in the circumferential direction. ,
The rotor includes a first magnetic pole block that is partitioned by being sandwiched between magnetic poles of the first polarity of the embedded magnet from both sides in the circumferential direction, and both sides of the circumferential direction between the magnetic poles of the second polarity of the embedded magnet. A second magnetic pole block that is separated by being sandwiched between
The first magnetic pole block has two magnet magnetic pole portions each having a second polarity appearing on the stator side by fixing a first permanent magnet, and a core disposed between the two magnet magnetic pole portions. A magnetic pole part is formed,
In the second magnetic pole block, a second permanent magnet is fixed, and thereby two magnet magnetic pole portions each having a first polarity appearing on the stator side, and a core disposed between the two magnet magnetic pole portions. A magnetic pole part is formed,
The first magnetic pole block and the second magnetic pole block are arranged so as to be alternately adjacent in the circumferential direction,
The rotor core is provided with a first protrusion that protrudes from the first magnetic pole block to at least one side in the axial direction, and at least an axial direction from a position radially inward of the first magnetic pole block in the second magnetic pole block. A second protrusion protruding on one side is provided,
On at least one side in the axial direction of the rotor, an auxiliary field having an auxiliary coil wound in the circumferential direction and a yoke serving as a magnetic path of a magnetic flux created by the auxiliary coil is disposed.
The yoke has an outer magnetic pole portion facing the first protrusion in the axial direction, and an inner magnetic pole portion facing the second protrusion in the axial direction has a gap interposed between the outer magnetic pole portion and the outer magnetic pole portion. A rotating electric machine characterized by being formed. In the rotating electrical machine according to claim 1,
The auxiliary magnetic field includes each magnet magnetic pole included in the magnetic pole block having the same polarity of the core magnetic pole when the second polarity appears in the outer magnetic pole and the first polarity appears in the inner magnetic pole. A rotating electrical machine configured to be able to supply an amount of magnetic flux that is the same as the polarity of a portion. In the rotating electrical machine according to claim 1 or 2,
The rotating electric machine is characterized in that the auxiliary field has a variable magnet that is provided in the middle of the magnetic path of the magnetic flux generated by the auxiliary coil and is magnetized along the magnetic flux. In the rotating electrical machine according to claim 3,
The rotating electric machine is characterized in that the variable magnet is formed in an annular shape and is juxtaposed in the axial direction with the auxiliary coil so as to sandwich the auxiliary coil with the rotor. In the rotary electric machine according to any one of claims 1 to 4,
The rotor core is configured by laminating a plurality of electromagnetic steel sheets,
The first magnetic pole block has a first insertion hole opened at least on one side in the axial direction at a position facing the outer magnetic pole portion, and the second magnetic pole block has at least one side in the axial direction. A second insertion hole is formed at a position facing the inner magnetic pole part,
The first protrusion is inserted into the first insertion hole, and is constituted by a rod-shaped first magnetic body having a smaller axial magnetic resistance than the axial magnetic resistance of the rotor core,
The rotating electrical machine according to claim 1, wherein the second protrusion is inserted into the second insertion hole and is constituted by a rod-shaped second magnetic body having a smaller axial magnetic resistance than an axial magnetic resistance of the rotor core. In the rotary electric machine according to any one of claims 1 to 4,
The first protrusion is composed of a first magnetic body fixed at a position facing the outer magnetic pole portion on the shaft end surface of the rotor core,
The rotating electric machine according to claim 1, wherein the second protrusion is constituted by a second magnetic body fixed at a position facing the inner magnetic pole portion on the shaft end surface of the rotor core.