WO2015005045A1 - Rotor et moteur électrique - Google Patents

Rotor et moteur électrique Download PDF

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Publication number
WO2015005045A1
WO2015005045A1 PCT/JP2014/065343 JP2014065343W WO2015005045A1 WO 2015005045 A1 WO2015005045 A1 WO 2015005045A1 JP 2014065343 W JP2014065343 W JP 2014065343W WO 2015005045 A1 WO2015005045 A1 WO 2015005045A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
rotor core
claw
gap
rotating shaft
Prior art date
Application number
PCT/JP2014/065343
Other languages
English (en)
Japanese (ja)
Inventor
石田　久
要介 藤井
透 湯本
Original Assignee
株式会社ミツバ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ミツバ filed Critical 株式会社ミツバ
Publication of WO2015005045A1 publication Critical patent/WO2015005045A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

  • the present invention relates to a rotor and an electric motor.
  • IPM Interior Permanent Magnet
  • a permanent magnet is embedded in a magnetic rotor core constituting a rotor
  • this type of motor has a magnetic body (rotor core) between permanent magnets adjacent in the circumferential direction, the amount of magnetic flux that detours to the rotor core out of the amount of magnetic flux from the permanent magnet increases. Leakage flux increases. For this reason, the magnetic flux linked to the winding around which the stator is wound is reduced, and the motor characteristics are deteriorated.
  • various techniques have been disclosed in IPM motors in order to prevent deterioration of motor characteristics.
  • a substantially cylindrical rotor core (rotor main body) having an internal opening and a plurality of permanent magnets arranged in a plurality of slots formed in the rotor core, the slot extending from the internal opening to the main body
  • each slot is formed with an end having an area in which the slot width is increased in the vicinity of the outer periphery of the rotor core (see, for example, Patent Document 1).
  • the leakage magnetic flux in the vicinity of the outer periphery of the rotor core can be reduced by forming an end portion having an area in which the slot width is enlarged in the vicinity of the outer periphery of the rotor core in each slot. For this reason, the magnetic flux (flux) concentration in the space
  • each slot is opened at the internal opening, and a rotation shaft (shaft) is inserted into the internal opening.
  • a rotation shaft shaft
  • the present invention provides a rotor and an electric motor that prevent a decrease in motor characteristics by suppressing an increase in leakage magnetic flux.
  • the rotor has a non-magnetic rotating shaft, a rotor core that is externally fixed to the rotating shaft, and a radial direction along the radial direction of the rotor core.
  • a plurality of permanent magnets arranged; and a fixing means for fixing the rotating shaft, the rotor core, and the plurality of permanent magnets.
  • a gap is provided in at least a part between the rotor core and the rotating shaft.
  • the rotor core in the rotor according to the first aspect of the present invention, includes a cylindrical first tube portion that is fitted and fixed to one end portion of the rotation shaft, and the first
  • a first rotor core member having a plurality of first claw portions provided on an outer peripheral surface of one cylinder portion and extending in the axial direction of the rotation shaft, and a cylinder that is externally fitted and fixed to the other end portion of the rotation shaft.
  • a second rotor core member having a shape-shaped second cylinder part and a plurality of second claw parts provided on the outer peripheral surface of the second cylinder part and extending between the adjacent first claw parts.
  • the plurality of permanent magnets may be arranged between the first claw portion and the second claw portion.
  • the first rotor core member magnetized on one pole and the second rotor core member magnetized on the other pole are magnetically insulated, and thus are generated by a permanent magnet.
  • the magnetic flux leakage path is interrupted. Thereby, the utilization efficiency of the magnetic flux which generate
  • the first rotor core member and the second rotor core member are integrally formed, it is possible to prevent the rotor core from being displaced due to the rotor core being attracted to the permanent magnet, and to perform rotation control with high accuracy. become.
  • the gap portion is formed between the first cylindrical portion and the second cylindrical portion that are separated in the axial direction.
  • At least one of the first gap, the second gap, and the third gap is nonmagnetic. It is good also as a structure filled with the material of.
  • Structuring as described above facilitates positioning of the first rotor core member and the second rotor core member. Further, even when the axial lengths of the first cylinder part and the second cylinder part are shortened, the first claw part and the second claw part can be stabilized.
  • the permanent magnet is the first claw part or the second claw part.
  • a first abutting surface that abuts from one side in the circumferential direction, and a second abutting surface that abuts the first claw portion or the second claw portion from the other circumferential direction, and the first abutting surface The distance between the surface and the second contact surface may be formed so as to gradually decrease toward the inner side in the radial direction.
  • the radial inner sides of the first claw portion and the second claw portion can be made thicker, so that the strength of the first rotor core member and the second rotor core member can be improved.
  • the fixing means includes the first claw portion and the second claw portion. It may be an annular member that fastens from the outer peripheral side.
  • the rotor according to the first aspect of the present invention two or more rotor cores are arranged along the axial direction of the rotating shaft, and each of the rotor cores is separately provided.
  • the permanent magnet may be arranged on the surface.
  • the plurality of rotor cores may be arranged shifted in the circumferential direction.
  • the permanent magnets are displaced from each other with respect to the axial direction, so that the same effect as when the permanent magnets are skewed can be obtained. That is, the cogging torque of the motor can be reduced and the motor characteristics can be improved.
  • the plurality of permanent magnets are formed by bond magnets, and the bond magnets are also filled in the gaps. Yes.
  • the process of assembling the permanent magnet to the rotor core is not necessary, and the permanent magnet can be attached to the rotor core simply by filling the rotor core with the bond magnet, so that the assembly of the rotor can be improved.
  • the permanent magnet is also disposed in the gap, the amount of magnetic flux of the permanent magnet can be increased, and the motor characteristics can be improved.
  • an electric motor includes a rotor according to the first aspect or the seventh aspect of the present invention, and is formed so as to surround the periphery of the rotor, and a winding is wound thereon. And a stator.
  • the amount of magnetic flux that detours to the rotating shaft side out of the amount of magnetic flux from the permanent magnet can be reduced, and deterioration of motor characteristics can be prevented.
  • FIG. 4 is a sectional view taken along line BB in FIG. 3.
  • FIG. 4 is a sectional view taken along the line CC of FIG.
  • FIG. 4 is a DD cross-sectional view of FIG. 3. It is sectional drawing which follows the axial direction explaining the space
  • FIG. 1 is a perspective view of the brushless motor 1 in the first embodiment
  • FIG. 2 is a configuration diagram of the brushless motor 1.
  • the brushless motor 1 is a so-called inner rotor, and includes a stator 3 press-fitted into the stator housing 2 and a rotor 4 that is rotatably arranged radially inward of the stator 3. is doing.
  • the stator housing 2 has a cylindrical shape, and the stator 3 is press-fitted into the inner periphery of the cylindrical portion.
  • One end of the rotating shaft 5 of the rotor 4 is exposed from one side of the stator housing 2.
  • the protruding side (left side in FIGS. 1 and 2) of the rotating shaft 5 in the brushless motor 1 is defined as one side, and the opposite side (right side in FIGS. 1 and 2) is defined as the other side. To do.
  • One side of the stator housing 2 is closed with a first bracket 6 formed in a substantially disc shape.
  • a first bearing support hole 7 is formed at the center of the first bracket 6.
  • a first bearing 8 that supports the rotary shaft 5 that constitutes the rotor 4 is press-fitted and fixed in the first bearing support hole 7.
  • the stator 3 has a substantially cylindrical stator core 10.
  • the outer peripheral surface of the stator core 10 is fixed to the inner peripheral surface of the stator housing 2 by, for example, press fitting.
  • the stator core 10 has a plurality of teeth (not shown) protruding radially inwardly at equal intervals in the circumferential direction.
  • a coil 12 is wound around the teeth via an insulator 11.
  • the stator core 10 is configured by stacking a plurality of steel plate materials in a laminated form.
  • the terminal portion of the coil 12 wound around each tooth is drawn out toward the other side of the stator housing 2 and connected to the multilayer printed board 13 disposed here.
  • the multilayer printed board 13 supplies electric power from the outside to the coil 12.
  • the multilayer printed circuit board 13 is connected via a terminal 14 to a power connector (not shown) protruding from the outer periphery of the stator housing 2.
  • a power cable connector (both not shown) extending from an external power source is formed on the power connector so as to be fitted and fixed, and power from the outside can be supplied to the multilayer printed board 13.
  • a second bracket 15 that closes the other side of the stator housing 2 is provided.
  • the second bracket 15 is formed in a substantially disk shape, and a second bearing support hole 16 is formed in the center.
  • a second bearing 17 is press-fitted and fixed in the second bearing support hole 16.
  • the brushless motor 1 has a magnetic encoder 20 for detecting the rotational position of the rotor 4.
  • the magnetic encoder 20 has a sensor magnet 21 provided at the end of the rotary shaft 5 so as to rotate integrally with the rotary shaft 5, and a magnetic sensor 22 provided on the inner surface of the third bracket 19. .
  • the sensor magnet 21 has a short cylindrical shape.
  • the sensor magnet 21 is fixed to a recess 23 formed at the other end of the rotating shaft 5 so as to be coaxial with the rotating shaft 5.
  • the inner diameter of the recess 23 is formed to be substantially the same as the outer diameter of the sensor magnet 21, and the sensor magnet 21 is fitted into the recess 23. Further, the recess 23 is formed so that the center position thereof coincides with the center axis of the rotary shaft 5.
  • the magnetic sensor 22 is disposed inside the third bracket 19 so as to face the sensor magnet 21 with a predetermined interval. As the magnetic sensor 22, a Hall element (Hall IC) that reacts to changes in magnetic poles is used.
  • the magnetic sensor 22 outputs a detection signal toward a control board (not shown) when the magnetic poles of the opposing portions change due to the rotation of the sensor magnet 21.
  • a Hall element is used as the magnetic sensor 22
  • the magnetic sensor 22 is not limited to this, and any other magnetic sensor 22 may be used as long as it can detect a change in the magnetic pole of the sensor magnet 21 fixed to the rotating shaft 5. Also good. Further, an optical encoder can be used in place of the magnetic sensor 22.
  • the rotor 4 for an electric motor includes a rotating shaft 5 formed of a nonmagnetic material such as an aluminum sintered material, and a rotor core that is externally fixed to the rotating shaft 5. 25, a plurality of permanent magnets 26 arranged at equal intervals in the circumferential direction in the rotor core 25, and an annular member 28 functioning as a fixing means for fixing the rotor core 25 and the permanent magnet 26 together. .
  • the number of permanent magnets 26 is 14, and the number of poles of the rotor 4 is 14.
  • the rotary shaft 5 is rotatably supported by the first bearing 8 and the second bearing 17 so as to coincide with the central axis O of the brushless motor 1.
  • a flange portion 27 for positioning the rotor core 25 is formed on the rotary shaft 5.
  • the flange portion 27 is a portion that protrudes in a bowl shape (in the radial direction) from the rotating shaft 5 in the vicinity of one end portion of the rotating shaft 5.
  • the outer peripheral surface of the rotating shaft 5 will be described as the outer peripheral surface of the main portion of the rotating shaft 5 excluding the flange portion 27, and the length of the rotating shaft 5 will be described as the length of the main portion of the rotating shaft 5.
  • the axial direction is the axial direction of the rotating shaft 5
  • the radial direction is the radial direction of the rotating shaft 5.
  • the annular member 28 is a ring formed of a nonmagnetic metal material such as SUS304. The annular member 28 is press-fitted into the rotor core 25.
  • the rotor core 25 includes a first rotor core member 29 and a second rotor core member 33 having substantially the same shape.
  • the first rotor core member 29 and the second rotor core member 33 are formed by integrally molding a soft magnetic material containing metal magnetic particles by compression molding (a powder magnetic core).
  • a material constituting the first rotor core member 29 and the second rotor core member 33 an alloy containing cobalt such as permendur, or a low iron loss powder magnetic core (a powder magnetic core coated with a resin) can be used. .
  • the first rotor core member 29 and the second rotor core member 33 have a plurality of claw portions 31 and 35 that are formed at equal intervals in the circumferential direction and extend in the axial direction.
  • the claw portion (first claw portion 31) of the first rotor core member 29 and the claw portion (second claw portion 35) of the second rotor core member 33 are arranged so that the first rotor core member 29 and the second rotor core member 33 are turned into the rotating shaft 5. By being attached, it is configured to be alternately arranged in the circumferential direction.
  • Each permanent magnet 26 is disposed in a space between the first claw portion 31 and the second claw portion 35.
  • FIG. 6 is a perspective view of the first rotor core member 29 in the first embodiment
  • FIG. 7 is a view taken in the direction of arrow E in FIG.
  • the first rotor core member 29 includes a first cylindrical portion 30 that is fitted and fixed to one end portion of the rotating shaft 5, and an outer circumferential surface of the first cylindrical portion 30 in the circumferential direction and the like.
  • a plurality of (seven in this embodiment) first claw portions 31 provided at intervals.
  • the first rotor core member 29 extends in the axial direction and includes a plurality of first claw portions 31 arranged at equal intervals in the circumferential direction and the first claw portions 31 on the radially inner peripheral side. It has the 1st cylinder part 30 to connect.
  • the first cylindrical portion 30 and the plurality of first claw portions 31 are integrally formed, and stabilization of the relative distance between the first claw portions 31 is achieved.
  • the first cylindrical portion 30 has a cylindrical shape and includes a cylindrical inner peripheral surface 37 that is fitted on the outer peripheral surface of the rotary shaft 5 and a cylindrical outer peripheral surface 38.
  • the axial length of the first cylindrical portion 30 is formed to be smaller than 1 ⁇ 2 of the length of the rotary shaft 5. Specifically, the length is about 3/7.
  • Each first claw portion 31 protrudes radially outward from the outer peripheral surface 38 of the cylindrical portion, and extends in one direction beyond one end of the first cylindrical portion 30.
  • the first claw portion 31 includes a base portion 31 a on the first tube portion 30 side and a protruding portion 31 b that protrudes from the first tube portion 30.
  • the length of the first claw portion 31 in the axial direction is substantially the same as the length of the rotary shaft 5.
  • the first claw portion 31 is a long member having a trapezoidal cross section extending in the axial direction of the first cylindrical portion 30.
  • the first claw portion 31 includes a pair of magnet contact surfaces 39 facing in the circumferential direction, an outer peripheral end surface 40 connecting the magnet contact surfaces 39 on the radially outer peripheral side, and a magnet on the radially inner peripheral side in the protruding portion. And an inner peripheral end face 41 that connects the contact faces 39 to each other.
  • the inner peripheral end face 41 is located on the outer peripheral side in the radial direction with respect to the outer peripheral face 38 of the first cylindrical part 30.
  • the inner peripheral end surface 41 is a surface that faces the cylindrical outer peripheral surface 38 of the second rotor core member 33 in the radial direction when the first rotor core member 29 and the second rotor core member 33 are attached to the rotary shaft 5.
  • a gap (third gap 53) is formed between the inner peripheral end face 41 of the first rotor core member 29 and the cylindrical outer peripheral face 38 of the second rotor core member 33.
  • the circumferential width of the first claw portion 31 is formed so as to increase toward the outer circumferential side in the radial direction.
  • the distance between the pair of magnet contact surfaces 39 of the first claw portion 31 is formed so as to be separated toward the radially outer peripheral side.
  • step portions 42 are formed at both axial ends of the outer peripheral end surface 40 of the first claw portion 31.
  • the step portion 42 is a step for attaching the annular member 28.
  • the step portion 42 has a step surface 43 that is formed parallel to the outer peripheral end surface 40 and offset from the outer peripheral end surface 40 toward the radially inner peripheral side.
  • the second rotor core member 33 has substantially the same shape as the first rotor core member 29.
  • the second rotor core member 33 includes a second cylindrical portion 34 that is externally fitted and fixed to the other end portion of the rotary shaft 5, and a plurality of second claws provided on the outer peripheral surface of the second cylindrical portion 34 at equal intervals in the circumferential direction Part 35.
  • the permanent magnet 26 is a long member having a trapezoidal cross section disposed between the first claw portion 31 and the second claw portion 35. In other words, the permanent magnet 26 does not have a rectangular cross section perpendicular to the axial direction.
  • the present invention is not limited to this, and the permanent magnet 26 may be formed into a flat plate (rectangular shape) in consideration of the manufacturing cost of the magnet if the strength of the base of the first claw portion 31 and the second claw portion 35 can be satisfied. .
  • it is good also as trapezoid shape (shape opposite to a present Example) which becomes narrow as it goes to an outer peripheral side in radial direction. By configuring in this way, it is possible to firmly prevent the permanent magnet 26 from jumping out when the rotor 4 is rotated at a high speed due to the wedge effect.
  • FIG. 8 is a perspective view of the permanent magnet 26 in the first embodiment.
  • the permanent magnet 26 includes a first contact surface 45 a that contacts the magnet contact surface 39 of the first claw portion 31 or the magnet contact surface 39 of the second claw portion 35 from one side in the circumferential direction.
  • the second contact surface 45b that contacts the magnet contact surface 39 of the first claw portion 31 or the magnet contact surface 39 of the second claw portion 35 from the other circumferential side.
  • the distance between the first contact surface 45a and the second contact surface 45b is formed so as to gradually decrease toward the radially inner peripheral side. That is, the cross-sectional shape orthogonal to the axial direction of the permanent magnet 26 has a trapezoidal shape that becomes narrower toward the radially inner peripheral side.
  • the first claw portion 31 and the second claw portion 35 have a shape corresponding to such a permanent magnet 26. That is, by combining the plurality of first claw parts 31, the plurality of second claw parts 35, and the plurality of permanent magnets 26 in the circumferential direction, all elements are combined so as to be dense in the circumferential direction. Is formed.
  • a permanent magnet is formed with rare earth magnets, such as neodymium sintering, for example.
  • the rotor 4 is formed by assembling the respective components shown in the exploded view of FIG. Specifically, the first cylindrical portion 30 of the first rotor core member 29 is press-fitted and fixed to one side of the rotary shaft 5, and the second cylindrical portion 34 of the second rotor core member 33 is press-fitted and fixed to the other side of the rotary shaft 5. To do. At this time, the first rotor core member 29 and the second rotor core member 33 are combined so that the protruding portion of the first claw portion 31 and the protruding portion of the second claw portion 35 face each other.
  • the permanent magnet 26 is inserted between the first claw portion 31 of the first rotor core member 29 and the second claw portion 35 of the second rotor core member 33. Subsequently, the whole is fixed by attaching the annular member 28 to the step part 42 of the first claw part 31 and the second claw part 35. At this time, the permanent magnet 26 can be inserted from the radial direction or the axial direction. When the axial length of the permanent magnet 26 is long, insertion from the axial direction is preferable from the viewpoint of ease.
  • the first claw portion 31 sandwiched between one pole (N pole) of the permanent magnet 26 adjacent in the circumferential direction is magnetized to the N pole
  • the other of the permanent magnet 26 The second claw portion 35 sandwiched between the two poles (S pole) is magnetized to the S pole. That is, the first rotor core member 29 constituting the first claw portion 31 is an N pole magnetic pole, and the second rotor core member 33 is an S pole magnetic pole.
  • FIG. 9 is a cross-sectional view taken along the line BB of FIG.
  • the first cylindrical portion 30 of the first rotor core member 29 and the second claw portion 35 of the second rotor core member 33 are separated in the radial direction.
  • a gap (second gap 52) is formed between the first cylinder part 30 and the second claw part 35.
  • FIG. 10 is a cross-sectional view taken along the line CC of FIG.
  • the first cylindrical portion 30 of the first rotor core member 29, the second cylindrical portion 34 of the second rotor core member 33, and the rotating shaft 5 are in the radial direction.
  • a gap is formed between the rotary shaft 5, the first claw part 31, and the second claw part 35.
  • FIG. 11 is a cross-sectional view taken along the line DD of FIG. As shown in FIG. 11, the second cylindrical portion 34 of the second rotor core member 33 and the first claw portion 31 of the first rotor core member 29 are separated from each other in the radial direction. That is, a gap (third gap 53) is formed between the second cylinder portion 34 and the first claw portion 31.
  • the air gap portion including the first air gap portion 51, the second air gap portion 52, and the third air gap portion 53 is formed between the first rotor core member 29 and the second rotor core member 33, and the rotation. Since the shaft 5 is formed of a nonmagnetic material, the first rotor core member 29 and the second rotor core member 33 are magnetically non-short-circuited.
  • FIG. 12 is a cross-sectional view along the axial direction for explaining the gap in the first embodiment. That is, the path of the magnetic flux flowing from the first rotor core member 29 magnetized to the N pole to the second rotor core member 33 magnetized to the S pole as shown by an arrow in FIG. 12 is blocked. Thereby, out of the magnetic flux amount from the permanent magnet 26, the magnetic flux amount detouring to the rotating shaft side can be reduced, and the deterioration of the motor characteristics can be prevented. As a result, it is possible to provide an electric motor capable of controlling rotation with high accuracy while suppressing an increase in leakage magnetic flux and preventing a decrease in motor characteristics.
  • the rotor core 25 is prevented from being displaced due to the rotor core 25 being attracted to the permanent magnet 26, and the rotation control is performed with high accuracy. It becomes possible to do.
  • first claw portion 31, the second claw portion 35, and the permanent magnet 26 arranged so as to be in close contact with each other in the circumferential direction are firmly fixed (press-fitted) while being pressed toward the radially inner peripheral side by the annular member 28.
  • the configuration Thereby, a compressive stress is applied in the direction in which the permanent magnet 26 and the claw are in contact with each other in the circumferential direction, and mutual restraint can be stabilized.
  • the number of poles can be increased only by increasing the number of permanent magnets 26. Thereby, the total magnetic flux can be increased without significantly increasing the number of assembly steps. Further, since the dimensions of the rotor core 25 are stabilized, it is possible to prevent a decrease in magnetic flux and an increase in cogging torque.
  • the flow of magnetic flux toward the rotating shaft 5 is prevented by forming the rotating shaft 5 from a non-magnetic material.
  • the magnetic field intensity in the magnetic sensor 22 is increased, and the sensor magnet 21 can be reduced in size and cost.
  • the recess 23 is formed so that the center position thereof coincides with the center axis of the rotary shaft 5, and the sensor magnet 21 is fitted in the recess 23, thereby detecting the angle of the magnetic encoder 20. The error can be reduced.
  • the cross-sectional shape orthogonal to the axial direction of the permanent magnet 26 has a trapezoidal shape that becomes narrower toward the radially inner peripheral side, so that the radially inner sides of the first claw portion 31 and the second claw portion 35 are formed. Can be thicker. Thereby, the intensity
  • annular member 28 to restrain the plurality of permanent magnets 26 together with the rotor core 25, it is possible to prevent the plurality of permanent magnets 26 from coming out radially outward.
  • an adhesive can be used as a fixing means for replacing the annular member 28. That is, the first rotor core member 29, the second rotor core member 33, and the plurality of permanent magnets 26 may be fixed using a resin mold or an adhesive without using the annular member 28.
  • FIG. 13 is a cross-sectional view showing the rotor 4 in the second embodiment.
  • the first rotor core member 29 of the second embodiment and the second cylinder portion 34 of the second rotor core member 33 are formed such that the axial length is shorter than that of the first embodiment. ing.
  • the first gap 51 is filled with a cylindrical spacer 47 made of, for example, polyacetal resin (POM).
  • the portion to be press-fitted and fixed is reduced by shortening the first cylindrical portion 30 and the second cylindrical portion 34, so that the amount of magnetic flux from the permanent magnet 26 can be further increased.
  • the spacer 47 is disposed in the first gap 51, the rotor core 25 can be easily positioned.
  • the spacer 47 is not always necessary, and the first gap 51 may be a space as in the rotor 4 of the first embodiment.
  • FIG. 14 is a perspective view showing the rotor 4 in the third embodiment.
  • the annular member 28 of the third embodiment is provided with an inner flange portion 48 that protrudes radially inward from the edge on one side in the axial direction over the entire circumference. That is, disk-shaped members formed integrally with the annular member 28 are in contact with both ends of the plurality of permanent magnets 26 in the axial direction.
  • the movement of the plurality of permanent magnets 26 in the axial direction can be restricted by the inner flange portion 48 provided on the annular member 28.
  • FIG. 15 is a cross-sectional view showing the rotor 4 in the fourth embodiment.
  • an escape portion 49 is formed at a connection portion between the claw portion and the cylindrical portion.
  • the circumferential both sides in the vicinity of the central portion are cut out over the entire length in the axial direction, leaving the vicinity in the circumferential center of the contact portion with the permanent magnet 26 on the outer peripheral surface of the cylindrical portion.
  • the contact area between the radially inner circumferential surface of the permanent magnet 26 and the outer circumferential surface of the cylindrical portion of the rotor core 25 is reduced. Thereby, the increase in leakage magnetic flux can be further suppressed.
  • FIGS. 16 is a configuration diagram of the brushless motor 1 in the fifth embodiment
  • FIG. 17 is a side view of the rotor 4 in the fifth embodiment viewed from the radial direction
  • FIG. 18 is the rotor 4 in the fifth embodiment.
  • the axial length of the rotor core 25 of the fifth embodiment is set to be approximately half that of the other embodiments described above.
  • the two rotor cores 25 are arrange
  • the rotor core 25 of the fifth embodiment can be said to have a two-part configuration in the axial direction of the rotor core 25 of the first embodiment.
  • each rotor core 25 is substantially the same as the configuration of the rotor core 25 in the first embodiment, description thereof is omitted.
  • a nonmagnetic spacer 547 is provided between the first cylindrical portion 30 of the first rotor core member 29 and the second cylindrical portion 34 of the second rotor core member 33 in the fifth embodiment.
  • the rotor core 25 in the first embodiment is different from the rotor core 25 in the fifth embodiment.
  • the spacer 547 has a cylindrical shape made of a nonmagnetic material, and is externally fixed to the rotary shaft 5.
  • Examples of the material of the spacer 547 include stainless steel (SUS) and polyacetal resin (POM).
  • the spacer 547 has a role of positioning the first rotor core member 29 and the second rotor core member 33 in the axial direction. That is, the first cylindrical portion 30 of the first rotor core member 29 is in contact with one end of the spacer 547 in the axial direction, and the second cylindrical portion 34 of the second rotor core member 33 is in contact with the other end. As a result, a gap (first gap 51 (see FIG. 2)) is not formed between the rotating shaft 5 and the rotor core 25.
  • the axial length of the permanent magnet 26 provided on the rotor core 25 is approximately half the axial length of the permanent magnet 26 in the first embodiment so as to correspond to the axial length of the rotor core 25, respectively.
  • a partition ring 560 is provided between the two rotor cores 25.
  • the partition ring 560 is for preventing magnetic flux leakage from one rotor core 25 of the two rotor cores 25 to the other rotor core 25.
  • the partition ring 560 is made of non-stainless material such as stainless steel (SUS) or polyacetal resin (POM). It is made of a magnetic material.
  • the two rotor cores 25 are arranged slightly shifted in the circumferential direction. That is, in the two rotor cores 25, the permanent magnets 26 are not completely wrapped in the axial direction, and the positions of the permanent magnets 26 are slightly shifted in the circumferential direction.
  • the length of one rotor core 25 in the axial direction is about half as compared with the first embodiment, the eddy current loss (iron loss) generated in the entire rotor core 25 is reduced accordingly. Can be small. Further, assembling of the permanent magnet 26 to the rotor core 25 can be improved by the amount that the axial direction of the rotor core 25 is shortened.
  • the skew means that the permanent magnet is disposed obliquely with respect to the axial direction or is magnetized obliquely.
  • the permanent magnets 26 of the rotor cores 25 may be actually skewed without disposing the two rotor cores 25 slightly shifted from each other in the circumferential direction.
  • the first claw portion 31 of the first rotor core member 29 constituting the rotor core 25 and the second claw portion 35 of the second rotor core 33 are formed so as to extend obliquely with respect to the axial direction.
  • the permanent magnet 26 is also formed obliquely with respect to the axial direction so as to correspond to the first claw portion 31 and the second claw portion 35.
  • FIG. 20 is a perspective view of the permanent magnet 26 in the sixth embodiment
  • FIG. 21 is a cross-sectional view of the rotor 4 in the sixth embodiment, which corresponds to FIG. 9 described above.
  • FIG. 22 is an enlarged view of a portion E in FIG.
  • the difference between the fifth embodiment and the sixth embodiment is that the permanent magnet 26 of the fifth embodiment is formed of a rare earth magnet such as neodymium sintering.
  • the permanent magnet 26 of the sixth embodiment is formed by a bonded magnet such as a neodymium bond.
  • the permanent magnet (neodymium bond) 26 is manufactured as follows. That is, first, the first rotor core member 29, the second rotor core member 33, the annular member 28, the spacer 547, and the partition ring 560 (all of which are shown in FIG. 18) are assembled to the rotary shaft 5, and then the first rotor core member 29 is assembled. The bond magnet is filled so as to fill a space between the first claw portion 31 and the second claw portion 35 of the second rotor core member 33.
  • the bonded magnet also fills a gap (second gap 52) formed between the first cylindrical portion 30 of the first rotor core member 29 and the second claw portion 35 of the second rotor core member 33. Is done.
  • the gap portion (third gap portion 53) formed between the second cylindrical portion 34 of the second rotor core member 33 and the first claw portion 31 of the first rotor core member 29 is also filled.
  • the bonded magnet has a substantially C-shaped cross section at both axial ends of each rotor core 25.
  • the bonded magnet is magnetized so that the magnetic pole changes in the thickness direction (for example, the outer side is the N pole and the inner side is the S pole). Thereby, manufacture of the permanent magnet (bonded magnet) 26 is completed.
  • the process of assembling the permanent magnet 26 to the rotor core 25 is not necessary, and the permanent magnet 26 can be attached to the rotor core 25 simply by filling the rotor core 25 with the bond magnet. Can be improved. Further, since the permanent magnet 26 is also disposed in the second gap portion 52 and the third gap portion 53, the amount of magnetic flux of the permanent magnet 26 can be increased, and as a result, the motor characteristics can be improved.
  • the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
  • the structure which combined the characteristic demonstrated by said several embodiment arbitrarily may be sufficient.
  • the number of poles is 14 in the rotor 4 of the above embodiment, it is not limited to this and can be changed as appropriate.
  • the number of poles of the rotor 4 can be changed in the range of 10 to 16.
  • the spacer 47 of the second embodiment can also be applied to the rotor 4 of the first embodiment. Furthermore, the permanent magnet 26 of the sixth embodiment can be applied to any of the first to fourth embodiments.
  • the amount of magnetic flux that detours to the rotating shaft side out of the amount of magnetic flux from the permanent magnet can be reduced, and deterioration of motor characteristics can be prevented.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un rotor (4) qui comprend : un arbre (5) tournant non magnétique ; un noyau (25) de rotor installé à l'extérieur et fixé à l'arbre (5) tournant ; une pluralité d'aimants permanents disposés radialement dans une direction périphérique, afin de se trouver le long d'une direction radiale du noyau (25) de rotor ; et un moyen (28) de fixation destiné à fixer l'arbre (5) tournant, le noyau (25) de rotor et la pluralité d'aimants permanents. Des espaces (51, 52, 53) sont ménagés dans au moins une section entre le noyau (25) de rotor et l'arbre (5) tournant.
PCT/JP2014/065343 2013-07-09 2014-06-10 Rotor et moteur électrique WO2015005045A1 (fr)

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JP2013-143636 2013-07-09
JP2013143636 2013-07-09

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WO2015005045A1 true WO2015005045A1 (fr) 2015-01-15

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108063507A (zh) * 2017-11-15 2018-05-22 广东美的环境电器制造有限公司 直流电机及风扇
KR20180086974A (ko) * 2017-01-24 2018-08-01 엘지이노텍 주식회사 모터
KR20190034935A (ko) * 2017-09-25 2019-04-03 엘지이노텍 주식회사 모터
JP2019122259A (ja) * 2018-01-10 2019-07-22 ビューラー モーター ゲゼルシャフト ミット ベシュレンクテル ハフツング 永久磁石ロータ
CN112075011A (zh) * 2018-05-10 2020-12-11 三菱电机株式会社 转子、电动机、压缩机及空气调节装置
EP3576254A4 (fr) * 2017-01-24 2020-12-16 LG Innotek Co., Ltd. Moteur
WO2023010843A1 (fr) * 2021-08-04 2023-02-09 中山大洋电机股份有限公司 Rotor de moteur électrique à aimant permanent de type disque et moteur électrique à aimant permanent de type disque l'utilisant

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JPH05207690A (ja) * 1992-01-27 1993-08-13 Fanuc Ltd 同期電動機のロータ
JP2006141197A (ja) * 2004-11-10 2006-06-01 Minebea Co Ltd 電気機械のロータ構造、及び、ロータ構造の製造方法
JP2009213256A (ja) * 2008-03-04 2009-09-17 Hitachi Ltd 回転電機および電気自動車
JP2012115085A (ja) * 2010-11-26 2012-06-14 Asmo Co Ltd ロータ及びモータ
WO2013175832A1 (fr) * 2012-05-24 2013-11-28 三菱電機株式会社 Rotor pour machine électrique tournante, machine électrique tournante et procédé de fabrication de rotor pour machine électrique tournante

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JPH05207690A (ja) * 1992-01-27 1993-08-13 Fanuc Ltd 同期電動機のロータ
JP2006141197A (ja) * 2004-11-10 2006-06-01 Minebea Co Ltd 電気機械のロータ構造、及び、ロータ構造の製造方法
JP2009213256A (ja) * 2008-03-04 2009-09-17 Hitachi Ltd 回転電機および電気自動車
JP2012115085A (ja) * 2010-11-26 2012-06-14 Asmo Co Ltd ロータ及びモータ
WO2013175832A1 (fr) * 2012-05-24 2013-11-28 三菱電機株式会社 Rotor pour machine électrique tournante, machine électrique tournante et procédé de fabrication de rotor pour machine électrique tournante

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180086974A (ko) * 2017-01-24 2018-08-01 엘지이노텍 주식회사 모터
EP3576254A4 (fr) * 2017-01-24 2020-12-16 LG Innotek Co., Ltd. Moteur
US11670975B2 (en) 2017-01-24 2023-06-06 Lg Innotek Co., Ltd. Motor having optimized gaps between magnets for improving cogging torque
KR102674223B1 (ko) * 2017-01-24 2024-06-12 엘지이노텍 주식회사 모터
KR20190034935A (ko) * 2017-09-25 2019-04-03 엘지이노텍 주식회사 모터
KR102491351B1 (ko) 2017-09-25 2023-01-25 엘지이노텍 주식회사 모터
CN108063507A (zh) * 2017-11-15 2018-05-22 广东美的环境电器制造有限公司 直流电机及风扇
JP2019122259A (ja) * 2018-01-10 2019-07-22 ビューラー モーター ゲゼルシャフト ミット ベシュレンクテル ハフツング 永久磁石ロータ
CN112075011A (zh) * 2018-05-10 2020-12-11 三菱电机株式会社 转子、电动机、压缩机及空气调节装置
WO2023010843A1 (fr) * 2021-08-04 2023-02-09 中山大洋电机股份有限公司 Rotor de moteur électrique à aimant permanent de type disque et moteur électrique à aimant permanent de type disque l'utilisant

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