WO2021234822A1 - Rotor, moteur électrique, ventilateur et climatiseur - Google Patents

Rotor, moteur électrique, ventilateur et climatiseur Download PDF

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Publication number
WO2021234822A1
WO2021234822A1 PCT/JP2020/019803 JP2020019803W WO2021234822A1 WO 2021234822 A1 WO2021234822 A1 WO 2021234822A1 JP 2020019803 W JP2020019803 W JP 2020019803W WO 2021234822 A1 WO2021234822 A1 WO 2021234822A1
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WO
WIPO (PCT)
Prior art keywords
magnet
yoke
rotor
resin
shaft
Prior art date
Application number
PCT/JP2020/019803
Other languages
English (en)
Japanese (ja)
Inventor
優人 浦辺
峰雄 山本
博幸 石井
隼一郎 尾屋
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/019803 priority Critical patent/WO2021234822A1/fr
Priority to PCT/JP2021/004210 priority patent/WO2021235017A1/fr
Publication of WO2021234822A1 publication Critical patent/WO2021234822A1/fr

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    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements

Definitions

  • the present disclosure relates to a rotor used in a brushless motor or the like, an electric motor having the rotor, a blower having the electric motor, and an air conditioner having the blower.
  • Patent Document 1 discloses a brushless motor including a rotor magnet, a magnet yoke that supports the rotor magnet, and a rotor having a sensor magnet, and the position of the rotor can be detected by the sensor magnet.
  • the sensor magnet is formed as a separate part from the rotor magnet and the magnet yoke, and the number of materials and man-hours for manufacturing the stator increase. It was difficult to reduce the cost.
  • the present disclosure is intended to solve the above-mentioned problems, and to provide a rotor, a motor, a blower, and an air conditioner capable of directly reducing manufacturing costs such as material costs or processing costs.
  • the rotor of the present disclosure includes a rotor magnet having a yoke formed in a cylindrical shape and a resin magnet integrally formed with the yoke on the outer periphery of the yoke, wherein the yoke is one of the axial directions of the yoke. It has a position detection magnet part at the end of.
  • the motor of the present disclosure includes the above-mentioned rotor.
  • blower of the present disclosure includes the above-mentioned electric motor.
  • the air conditioner of the present disclosure is provided with the above-mentioned blower.
  • the position detection magnet is formed as a part of the yoke, the number of materials and the work man-hours at the time of manufacturing the stator can be reduced as compared with the case where the position detection magnet is formed as a separate part from the yoke. Therefore, according to the present disclosure, it is possible to reduce the manufacturing cost such as the direct material cost or the processing cost at the time of manufacturing the rotor.
  • FIG. 5 is a side view including a partial cross section of the motor according to the first embodiment as viewed from the circumferential surface of the stator. It is an enlarged view of the area A of FIG. It is a perspective view which saw the stator of the electric motor which concerns on Embodiment 1 from the rotor accommodating opening side. It is a perspective view which saw the stator of the electric motor which concerns on Embodiment 1 from the shaft hole side.
  • FIG. It is a perspective view which shows an example of the structure of the rotor which concerns on Embodiment 1.
  • FIG. It is a side view which looked at the rotor which concerns on Embodiment 1 from the outer peripheral surface side. It is a perspective view which looked at the rotor magnet which concerns on Embodiment 1 from the position detection magnet part side. It is a perspective view which looked at the rotor magnet which concerns on Embodiment 1 from the opposite side of the position detection magnet part. It is a side view which looked at the rotor magnet which concerns on Embodiment 1 from the outer peripheral surface side. It is a perspective view which looked at the yoke which concerns on Embodiment 1 from the position detection magnet part side.
  • FIG. 5 is a side view including a partial cross section of the motor according to the third embodiment as viewed from the circumferential surface of the stator. It is an enlarged view of the area B of FIG. 24.
  • FIG. 5 is a side view including a partial cross section of the motor according to the fourth embodiment as viewed from the circumferential surface of the stator.
  • FIG. 1 is a schematic view showing an example of the air conditioner 1000 according to the first embodiment.
  • the dimensional relationship and shape of each constituent member may differ from the actual ones.
  • the same members or parts or members or parts having the same functions are designated by the same reference numerals or omitted.
  • the air conditioner 1000 is, for example, a separate type air conditioner having an indoor unit 200, an outdoor unit 300, and a refrigerant pipe 150 connecting between the indoor unit 200 and the outdoor unit 300. It can be 1000.
  • the indoor unit 200 is installed, for example, on a wall surface in an air-conditioned space.
  • the outdoor unit 300 is installed on the floor surface outside the air-conditioned space, for example.
  • the single indoor unit 200 or the outdoor unit 300 is also included in the air conditioner 1000.
  • the air conditioner 1000 is formed with a refrigerant circuit including a refrigerant pipe 150 and a compressor 400 such as a scroll compressor. By driving the compressor 400, a refrigerant is generated between the outdoor unit 300 and the indoor unit 200. It is circulated. For example, when a low-temperature two-phase refrigerant is supplied to the indoor unit 200, cold air is supplied from the indoor unit 200 into the air-conditioned space by driving the indoor unit 200. The operating mode of the air conditioner 1000 in which cold air is supplied to the air-conditioned space is called “cooling operation”. Further, when the indoor unit 200 is supplied with a high-temperature and high-pressure gas phase refrigerant, warm air is supplied from the indoor unit 200 into the air-conditioned space by driving the indoor unit 200. The operation mode of the air conditioner 1000 in which warm air is supplied to the air-conditioned space is called "heating operation".
  • the indoor unit 200 accommodates an indoor blower 500a. Further, although not shown, the indoor unit 200 includes an indoor heat exchanger forming a part of the refrigerant circuit.
  • the indoor blower 500a for example, a multi-blade fan such as a cross flow fan is used.
  • the indoor heat exchanger for example, an air-cooled heat exchanger such as a fin-and-tube heat exchanger is used. The air in the air-conditioned space is attracted to the inside of the indoor unit 200 by the rotational drive of the indoor blower 500a and passes through the indoor heat exchanger. The air in the air-conditioned space that passes through the indoor heat exchanger exchanges heat with the refrigerant that flows inside the indoor heat exchanger.
  • the refrigerant flowing inside the indoor heat exchanger during the cooling operation is a low-temperature two-phase refrigerant
  • the refrigerant flowing inside the indoor heat exchanger during the heating operation is a high-temperature and high-pressure gas-phase refrigerant.
  • the heat-exchanged air that is, cold air or warm air, is blown out to the air-conditioned space by the rotary drive of the indoor blower 500a.
  • the wind direction of the air blown out into the air-conditioned space is adjusted by the rotational movement of the vane 250 provided in the indoor unit 200.
  • the outdoor unit 300 houses an outdoor blower 500b. Further, although not shown, the outdoor unit 300 includes an outdoor heat exchanger that forms a part of the refrigerant circuit.
  • the outdoor blower 500b for example, an axial fan such as a propeller fan is used.
  • the outdoor heat exchanger for example, an air-cooled heat exchanger such as a fin-and-tube heat exchanger is used. The outside air is attracted to the inside of the outdoor unit 300 by the rotational drive of the outdoor blower 500b, and passes through the outdoor heat exchanger. The outside air passing through the outdoor heat exchanger is heat exchanged with the refrigerant flowing inside the outdoor heat exchanger.
  • the refrigerant flowing inside the outdoor heat exchanger during the cooling operation is a high-temperature and high-pressure gas-phase refrigerant
  • the refrigerant flowing inside the outdoor heat exchanger during the heating operation is a low-temperature two-phase refrigerant.
  • the heat-exchanged outside air is blown out to the outside of the outdoor unit 300 by the rotational drive of the outdoor blower 500b.
  • the indoor blower 500a and the outdoor blower 500b are collectively referred to as a blower 500 unless it is necessary to distinguish them.
  • the blower 500 includes an electric motor 100 for rotationally driving the blower 500.
  • the electric motor 100 according to the first embodiment will be described with reference to FIGS. 2 to 7.
  • FIG. 2 is a perspective view of the motor 100 according to the first embodiment as viewed from the extending direction of the shaft 1.
  • FIG. 3 is a perspective view of the motor 100 according to the first embodiment as viewed from the bracket 4 side.
  • FIG. 4 is a side view including a partial cross section of the motor 100 according to the first embodiment as viewed from the circumferential surface of the stator 2. Note that FIG. 4 schematically shows a part of the internal structure of the motor 100.
  • FIG. 5 is an enlarged view of the region A of FIG.
  • FIG. 6 is a perspective view of the stator 2 of the motor 100 according to the first embodiment as viewed from the rotor accommodating port 20a side.
  • FIG. 7 is a perspective view of the stator 2 of the motor 100 according to the first embodiment as viewed from the shaft hole 22a1 side.
  • the electric motor 100 is formed as, for example, a molded DC brushless motor which is a kind of synchronous motor.
  • the electric motor 100 has a shaft 1 which is a drive shaft of the electric motor 100, and a stator 2 having a chamber 20 through which the shaft 1 is passed. Further, the motor 100 has a connection cable 3 drawn into the stator 2 and a bracket 4 attached to the stator 2 and rotatably supporting the shaft 1. Further, the motor 100 has a rotor magnet 5 arranged between the shaft 1 and the stator 2, and a wheel 7 fixed between the rotor magnet 5 and the shaft 1. In the first embodiment, the rotor magnet 5, the shaft 1, and the wheel 7 form the rotor 6.
  • the shaft 1 is a drive shaft that transmits the rotational motion of the rotor magnet 5.
  • the shaft 1 is made of, for example, stainless steel.
  • the rotated main body of the blower 500 for example, the propeller of the propeller fan, is attached to the tip 10 of the shaft 1.
  • the configuration of the blower 500 other than the motor 100 is not shown.
  • a stopper 14 is formed on a part of the peripheral surface 12 of the shaft 1.
  • the stopper 14 is knurled. Knurling refers to the processing of uneven shapes applied to the metal surface.
  • the stopper 14 is, for example, knurled in a twill shape.
  • the knurled stopper 14 has a larger coefficient of friction than the peripheral surface 12 of the shaft 1 not knurled.
  • the boss 70 of the wheel 7 is connected to the portion of the peripheral surface 12 of the shaft 1 including the stopper 14.
  • the uneven stopper 14 penetrates into the inner wall surface 70a of the boss 70.
  • the uneven shape of the stopper 14 invades the inner wall surface 70a of the boss 70, which limits the movement of the wheel 7 on the peripheral surface 12 of the shaft 1. Therefore, by providing the stopper 14 on the peripheral surface 12 of the shaft 1, it is possible to prevent the wheel 7 from moving in the axial direction of the shaft 1 from the connecting position of the wheel 7. Further, by providing the stopper 14 on the peripheral surface 12 of the shaft 1, it is possible to prevent the wheel 7 from spontaneously rotating and moving in the circumferential direction of the shaft 1 from the connecting position of the wheel 7.
  • first bearing 90 and the second bearing 92 are arranged as bearings 9 at both ends of the connecting position of the wheel 7 in the axial direction of the shaft 1.
  • the first bearing 90 is arranged on the tip 10 side of the shaft 1.
  • the second bearing 92 is arranged at the end 16 of the shaft 1.
  • the first bearing 90 and the second bearing 92 have a hollow cylindrical appearance, and are formed as rolling bearings such as ball bearings or cylindrical roller bearings, for example.
  • the first bearing 90 is arranged on the outer peripheral side of the first rotary raceway ring 90a1 forming the inner ring of the first bearing 90 and the outer peripheral side of the first rotary raceway ring 90a1 and forms the outer ring of the first bearing 90. It has 90a2.
  • the first rotary raceway ring 90a1 and the first fixed raceway ring 90a2 form a first raceway ring 90a having a hollow cylindrical appearance.
  • the first bearing 90 has a plurality of first rolling elements 90b arranged between the first rotary raceway ring 90a1 and the first fixed raceway ring 90a2.
  • the first rolling element 90b for example, a ball or a cylindrical roller is used.
  • the circumferential surface of the first rotary raceway ring 90a1 corresponding to the inner peripheral surface of the first raceway ring 90a is fixed to the shaft 1. Further, one hollow disk surface of the first rotary raceway ring 90a1 is arranged so as to be in contact with the first terminal 70b1 of the boss 70. The first end 70b1 of the boss 70 is located on the tip 10 side of the shaft 1, and for example, a hollow disk-shaped mounting surface is formed. By forming a hollow disk-shaped mounting surface on the first terminal 70b1 of the boss 70, one hollow disk surface of the first rotary raceway ring 90a1 can be stably mounted on the boss 70 of the wheel 7. Therefore, the stability of rotation of the shaft 1 can be improved.
  • the circumferential surface of the first fixed raceway ring 90a2 corresponding to the outer peripheral surface of the first raceway ring 90a is fixed to, for example, the bearing support wall 22a of the outer shell 22 of the stator 2.
  • the bearing support wall 22a has, for example, an L-shaped cross section for fixing the circumferential surface of the first fixed raceway ring 90a2 and the hollow disk surface of the first fixed raceway ring 90a2 located on the tip 10 side of the shaft 1. It has a wall surface.
  • the bearing support wall 22a is formed with a shaft hole 22a1 through which the shaft 1 penetrates and communicates with the chamber 20.
  • the second bearing 92 is a second fixed raceway ring arranged on the outer peripheral side of the second rotary raceway ring 92a1 forming the inner ring of the second bearing 92 and the outer ring of the second rotary raceway ring 92a1 and forming the outer ring of the second bearing 92. It has 92a2 and.
  • the second rotary raceway ring 92a1 and the second fixed raceway ring 92a2 form a second raceway ring 92a having a hollow cylindrical appearance.
  • the second bearing 92 has a plurality of second rolling elements 92b arranged between the second rotary raceway ring 92a1 and the second fixed raceway ring 92a2.
  • the second rolling element 92b for example, a ball or a cylindrical roller is used.
  • the second bearing 92 is fixed to the end 16 of the shaft 1.
  • the second bearing 92 fixed to the end 16 of the shaft 1 is housed in a bracket 4 made of elastic sheet metal such as stainless steel.
  • the bracket 4 has a disk-shaped lid 40 having a cylindrical recess 40a formed therein, and a leaf spring 42 integrally molded on the peripheral edge of the lid 40 and having an inverted U-shaped cross section.
  • the lid 40 of the bracket 4 is formed on the stator 2 and closes the rotor accommodating port 20a communicating with the chamber 20 of the stator 2.
  • a washer spring 44 is housed in the recess 40a of the lid 40, and the second bearing 92 is provided so that the hollow disk surface of the second fixed raceway ring 92a2 located on the terminal 16 side of the shaft 1 comes into contact with the washer spring 44. Is housed.
  • the circumferential surface of the second rotary raceway ring 92a1 corresponding to the inner peripheral surface of the second raceway ring 92a is fixed to the end 16 of the shaft 1. Further, one hollow disk surface of the second rotary raceway ring 92a1 is arranged so as to be in contact with the second terminal 70b2 of the boss 70. The second end 70b2 of the boss 70 is located on the end 16 side of the shaft 1, and for example, a hollow disk-shaped mounting surface is formed. By forming a hollow disk-shaped mounting surface on the second end 70b2 of the boss 70, one hollow disk surface of the second rotary raceway ring 92a1 can be stably mounted on the boss 70 of the wheel 7. Therefore, the stability of rotation of the shaft 1 can be improved.
  • the leaf spring 42 is fitted into the stator 2 and the bracket 4 is fixed. It is attached to the child 2.
  • the elastic force of the washer spring 44 is applied to the second fixed raceway ring 92a2 in the direction of the tip 10 of the shaft 1, so that the elastic force of the washer spring 44 causes the first bearing 90. Is pushed into the bearing support wall 22a.
  • the second bearing 92 is pushed in the direction of the washer spring 44 by the drag force against the elastic force of the washer spring 44, the second bearing 92 is pushed into the recess 40a of the lid 40. Therefore, the movement of the first bearing 90 and the second bearing 92 in the rotational direction or the axial direction of the shaft 1 due to the rotational drive of the shaft 1 is suppressed, so that the rotational stability of the shaft 1 can be improved. ..
  • first bearing 90 and the second bearing 92 are collectively referred to as a bearing 9 when it is not necessary to distinguish them. Further, details of the wheel 7 other than those described above will be described later.
  • the stator 2 has a hollow cylindrical stator core 23, an insulator 25 arranged on a pair of hollow disk surfaces of the stator core 23, and a wire such as a copper magnet wire attached to the stator core 23 and the insulator 25. It has a coil 27 formed by winding.
  • the stator core 23, the insulator 25 (first insulator 25a, second insulator 25b), and the coil 27 form the main body portion of the stator 2.
  • the stator core 23 has an annular core back 23a forming the outer peripheral surface of the stator core 23, and a plurality of teeth 23b extending from the core back 23a in the direction of the stator core 23.
  • the number of teeth 23b is a multiple of three. For example, when the number of magnetic poles of the rotor magnet 5 is 8, the number of teeth 23b is 12.
  • the stator core 23 is formed with a slot surrounded by two adjacent teeth 23b and a core back 23a.
  • the number of slots formed in the stator core 23 is the same as the number of teeth 23b.
  • the first insulator 25a is provided with a plurality of, for example, three pins, and a circuit board 28 is attached to the first insulator 25a.
  • the circuit board 28 is formed, for example, in the shape of a hollow disk.
  • a magnetic detector 29 is mounted on the surface of the circuit board 28 on the side facing the stator core 23. The magnetic detector 29 is arranged at a position where the magnetic field from the rotor magnet 5 can be detected, and is arranged on the inner peripheral side of the circuit board 28 when the circuit board 28 has a hollow disk shape.
  • a Hall element made of indium antimonide or gallium arsenide is used.
  • a Hall IC which is an integrated circuit type magnetic sensor in which a Hall element and a signal conversion circuit are integrated on a single semiconductor substrate, may be used.
  • the circuit board 28 may be equipped with an inverter circuit and a control circuit in addition to the magnetic detector 29.
  • the thin plate of the stator core 23 contains a small amount of silicon of about 0.5 to 6.5% in iron, and an electromagnetic steel sheet such as a silicon steel sheet having a thickness of 0.1 to 0.7 mm is punched. Manufactured by.
  • the thin plate of the stator core 23 is punched in a strip-like shape by cutting one of the core backs 23a between the adjacent teeth 23b.
  • the thin plates of the plurality of stator cores 23 that have been punched are laminated to each other by caulking, welding, bonding, or the like.
  • the insulator 25 is arranged on the T-shaped surface of each tooth 23b of the stator core 23.
  • the insulator 25 is arranged on the laminated stator core 23, for example, by directly injecting a thermoplastic resin such as acrylonitrile butadiene styrene resin into the stator core 23 and molding the insulator 25.
  • a thermoplastic resin such as acrylonitrile butadiene styrene resin
  • ABS resin acrylonitrile butadiene styrene resin
  • the insulator 25 may be molded, for example, in a process different from the manufacturing of the stator core 23, and the insulator 25 may be attached to the stator core 23 after the insulator 25 is molded.
  • the wire of the coil 27 is wound in a concentrated winding around each of the teeth 23b of the stator core 23 in which the insulator 25 is arranged.
  • the winding of the wire of the coil 27 is performed in a state where the stator core 23 extends in a band shape, and the winding of the wire of the coil 27 forms the main body portion of the stator 2 in a band shape.
  • the 2 ends of the wire of the coil 27 are arranged in the first insulator 25a.
  • the core back 23a forms the outer circumference of the stator core 23, and the tip wall 23b1 of the teeth 23b is bent in a circular shape so as to form the inner circumference of the stator core 23.
  • Both ends of the core back 23a of the stator core 23 are fixed by welding.
  • the main body portion of the stator 2 is formed into a hollow cylindrical shape.
  • the circuit board 28 is attached to the main body of the stator 2 formed in the shape of a hollow cylinder. Further, the coating on one end of the lead wire 30 of the connection cable 3 is peeled off and placed on the first insulator 25a or the circuit board 28. The coating is peeled off, and one end of the lead wire 30 arranged on the first insulator 25a or the circuit board 28 is connected by fusing, spot welding, solder joining, or the like. Further, the end of the crossover wire connecting the wires of each coil 27 is arranged in the first insulator 25a, and is connected by fusing, spot welding, solder joining or the like. Further, the lead wire 30 arranged on the circuit board 28 is connected to the magnetic detector 29 as a sensor wire by solder joining or the like.
  • the main body of the stator 2 is housed in the core of the mold from the second insulator 25b side for molding.
  • the protrusion formed on the second insulator 25b is arranged on the core metal side of the core, and the main body portion of the stator 2 can be fixed to the core in a stable state. Therefore, by forming the protrusion on the second insulator 25b, the productivity in the molding of the stator 2 can be improved, and the quality of the molded stator 2 can be improved accordingly.
  • thermosetting resin such as a bulk molding compound containing an unsaturated polyester resin as a main component is filled, and the stator 2 is molded by injection molding. Further, molding may be performed by compression molding.
  • the bulk molding compound is abbreviated as BMC.
  • the stator 2 does not have to be molded.
  • the stator 2 may have a main body portion of the stator 2 housed in a casing made of a thermoplastic resin.
  • FIG. 8 is a perspective view showing an example of the structure of the rotor 6 according to the first embodiment.
  • FIG. 9 is a side view of the rotor 6 according to the first embodiment as viewed from the outer peripheral surface side.
  • FIG. 10 is a perspective view of the rotor magnet 5 according to the first embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 11 is a perspective view of the rotor magnet 5 according to the first embodiment as viewed from the opposite side of the position detection magnet portion 58.
  • FIG. 12 is a side view of the rotor magnet 5 according to the first embodiment as viewed from the outer peripheral surface side.
  • FIG. 13 is a perspective view of the yoke 52 according to the first embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 14 is a perspective view of the yoke 52 according to the first embodiment as viewed from the opposite side of the position detection magnet portion 58.
  • FIG. 15 is a front view of the yoke 52 according to the first embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 16 is a side view of the yoke 52 according to the first embodiment as viewed from the outer peripheral surface side.
  • FIG. 17 is a front view of the yoke 52 according to the first embodiment as viewed from the opposite side of the position detection magnet portion 58.
  • the rotor 6 has the shaft 1 described above, the rotor magnet 5 and the wheel 7 described later.
  • the rotor magnet 5 has a resin magnet 50 and a yoke 52 formed through the resin magnet 50.
  • the resin magnet 50 is formed in a cylindrical shape.
  • the yoke 52 is formed in a tubular shape on the inner peripheral side of the resin magnet 50.
  • the yoke 52 is also referred to as a back yoke.
  • the resin magnet 50 is a bond magnet provided on the outer periphery of the rotor magnet 5 and generates a magnetic field radially from the resin magnet 50 toward the stator 2.
  • the resin magnet 50 is arranged at the same position as the tip wall 23b1 of the teeth 23b of the stator 2 in the axial direction of the shaft 1, and is formed to have the same width as the tip wall 23b1 of the teeth 23b of the stator 2.
  • the resin magnet 50 rotates in the circumferential direction by the magnetic field generated by the energization of the stator 2, and transmits the rotational movement to the shaft 1 via the wheel 7.
  • the axial direction of the shaft 1 is the same as the axial direction of the resin magnet 50 formed in a cylindrical shape.
  • the resin magnet 50 has multiple magnetic poles of 2.
  • the magnetic poles of the resin magnet 50 are formed so that the polarities alternate along the circumferential direction of the rotor magnet 5.
  • eight magnetic poles are formed on the resin magnet 50, and four N poles and four S poles are formed so as to alternate in the circumferential direction.
  • the resin magnet 50 is formed of, for example, a raw material containing a rare earth magnet powder such as samarium iron or a ferrite powder such as neodymium-iron-boron powder in a polyamide resin such as nylon or a thermoplastic resin such as polyphenylene sulfide resin. Will be done.
  • the polyphenylene sulfide resin is abbreviated as PPS resin.
  • samarium iron is abbreviated as samarium iron.
  • the yoke 52 is provided on a part of the outer peripheral side of the yoke 52 and has a support portion 55 that supports the resin magnet 50.
  • the support portion 55 is located on the inner peripheral side of the resin magnet 50.
  • a position detection magnet portion 58 is formed in a part of the yoke 52.
  • the position detection magnet portion 58 is formed on the first hollow wall 55a1, which is one end portion 55a of the yoke 52 in the axial direction.
  • the resin magnet 50 can be integrally molded with the yoke 52 by injection molding.
  • the other end 55a of the support portion 55 paired with the first hollow wall 55a1 in the axial direction of the shaft 1 will be referred to as a second hollow wall 55a2.
  • the position detection magnet portion 58 is not formed on the second hollow wall 55a2.
  • the yoke 52 is formed by injection molding into a mold.
  • the yoke 52 is formed of, for example, a raw material in which a powder of a soft magnetic material, which is a magnetic material that can be magnetized or demagnetized relatively easily, is contained in a polyamide resin such as nylon or a thermoplastic resin such as polyphenylene sulfide resin. NS.
  • a powder of the soft magnetic material for molding the yoke 52 for example, powder such as iron or silicon rope is used.
  • the outer peripheral wall 55b of the support portion 55 can be formed to have the same width as the resin magnet 50 in the axial direction of the shaft 1, for example.
  • the protruding wall 55b1 and the recessed wall 55b2 can be alternately arranged along the circumferential direction.
  • the protruding wall 55b1 is provided at a position in phase with the inverted position of the adjacent magnetic poles of the resin magnet 50.
  • the recessed wall 55b2 is provided at a position in phase with the center of the magnetic pole of the resin magnet 50. For example, when eight magnetic poles are formed on the resin magnet 50, eight protruding walls 55b1 and eight recessed walls 55b2 are formed.
  • the magnetic flux at each magnetic pole of the resin magnet 50 can be focused at the center of each magnetic pole.
  • the change in the magnetic field distribution in the circumferential direction of the resin magnet 50, particularly at the inverted position of the adjacent magnetic poles can be moderated.
  • the waveform of the induced voltage generated in the stator 2 due to the rotation of the rotor magnet 5 becomes close to a sine wave.
  • the protruding wall 55b1 and the recessed wall 55b2 may be omitted, and the outer peripheral shape of the support portion 55 may be circular.
  • the inner peripheral wall 55c of the support portion 55 has a first inner peripheral wall 55c1 connected to the inner circumference of the first hollow wall 55a1. Further, the inner peripheral wall 55c of the support portion 55 has a second inner peripheral wall 55c2 connected between the first inner peripheral wall 55c1 and the inner peripheral of the second hollow wall 55a2.
  • the first inner peripheral wall 55c1 has an expanded tube-shaped wall surface in which the opening of the first inner peripheral wall 55c1 increases toward the direction from the first hollow wall 55a1 to the second hollow wall 55a2.
  • the second inner peripheral wall 55c2 has a straight pipe-shaped wall surface.
  • the position detection magnet unit 58 generates a magnetic field in the axial direction of the shaft 1.
  • the magnetic field from the position detection magnet unit 58 is detected by the magnetic detector 29 of the stator 2, and the rotation position information of the rotor magnet 5 is calculated by a control device or the like from the detected magnetic information.
  • the calculated rotation position information is used for controlling the rotation speed of the rotor magnet 5 and the like.
  • the position detection magnet portion 58 is formed with, for example, multiples of 2 magnetic poles.
  • the magnetic poles of the hollow disk wall 58a of the position detection magnet portion 58 are formed so that the polarities alternate along the rotation direction of the shaft 1.
  • the direction of the magnetic field of the position detection magnet portion 58 is a direction intersecting the direction of the magnetic field of the resin magnet 50, for example, a vertical direction.
  • the position detection magnet portion 58 is formed so that the outer circumference of the position detection magnet portion 58 in the first hollow wall 55a1 is located inside the outer circumference of the first hollow wall 55a1. Further, the position detection magnet portion 58 is formed so that the inner circumference of the position detection magnet portion 58 in the first hollow wall 55a1 is located outside the inner circumference of the first hollow wall 55a1.
  • the position detection magnet portion 58 is formed in a hollow truncated cone shape, and has an expanded tube-shaped wall surface whose opening becomes smaller as the distance from the first hollow wall 55a1 increases. The length of the position detection magnet portion 58 of the shaft 1 in the axial direction is determined according to the distance from the magnetic detector 29 provided on the stator 2.
  • the position detection magnet portion 58 is provided in a part of the yoke 52, it is necessary to prepare a magnet for position detection as a separate part from the yoke 52, and the magnet for position detection is assembled to the yoke 52. There is no need. Therefore, it is possible to reduce the direct material cost such as the raw material cost for preparing the magnet for position detection or the processing cost for assembling the magnet to the yoke 52, so that the manufacturing cost of the rotor magnet 5 can be reduced.
  • a brushless motor such as a brushless DC motor is used.
  • the inverter control of the brushless motor is performed in order to control the rotation speed of the blower 500.
  • the position information of the rotor magnet 5 is used as the input information for controlling the rotation speed of the blower 500.
  • the detection of the position information of the rotor magnet 5 is performed by detecting the magnetic information from the magnet of the rotor magnet 5 with the magnetic detector 29.
  • a magnet for detecting the position of the rotor magnet 5 is prepared as a separate part, the number of parts for manufacturing the rotor magnet 5 increases. Therefore, a direct material cost such as a raw material cost for preparing a magnet for position detection or a processing cost for assembling the magnet to the yoke 52 is required.
  • the yoke 52 is formed with one or more anchors 58b protruding from the inner circumference of the position detection magnet portion 58 and connected to the first hollow wall 55a1.
  • the anchor 58b is connected to the wheel 7 and transmits the torque of the rotor magnet 5 to the wheel 7.
  • the anchors 58b can be arranged at equal intervals along the inner circumference of the position detection magnet portion 58.
  • the number of anchors 58b can be the same as the number of magnetic poles of the resin magnet 50.
  • the yoke 52 is formed with a plurality of tags 58c protruding from the outer periphery of the position detection magnet portion 58 and connected to the first hollow wall 55a1.
  • the tags 58c are arranged at equal intervals along the outer circumference of the position detection magnet portion 58.
  • the number of tags 58c can be the same as the number of magnetic poles of the resin magnet 50.
  • the tags 58c can be arranged at a position having the same phase as the recessed wall 55b2. That is, the tag 58c can be arranged at a position in phase with the center of the magnetic pole of the resin magnet 50.
  • the position of the tag 58c can be visually confirmed and the yoke 52 can be attached to the mold.
  • the phase of the yoke 52 with respect to the rotation direction of the mold can be visually determined, and the yoke 52 can be attached to the mold. Therefore, when the resin magnet 50 or the wheel 7 is molded into the yoke 52, the mounting position of the yoke 52 with respect to the mold can be easily determined, so that the manufacturing load of the rotor magnet 5 can be reduced. Further, since the error in the mounting position of the yoke 52 with respect to the mold can be reduced, the design accuracy of the rotor magnet 5 can be improved.
  • the inner peripheral wall 55c of the support portion 55 is formed with a plurality of guide grooves 55c3 extending in the axial direction of the shaft 1 between the inner peripheral of the second hollow wall 55a2 and the second inner peripheral wall 55c2.
  • the lengths of the plurality of guide grooves 55c3 in the axial direction of the shaft 1 are the same.
  • the length of the guide groove 55c3 in the circumferential direction becomes smaller as it approaches the second inner peripheral wall 55c2 from the inner circumference of the second hollow wall 55a2.
  • the guide groove 55c3 can be arranged at a position in phase with the protruding wall 55b1.
  • eight guide grooves 55c3 can be arranged at positions having the same phase as the inverted positions of the adjacent magnetic poles of the resin magnet 50.
  • the guide groove 55c3 By providing the guide groove 55c3 at a position in phase with the inverted position of the adjacent magnetic poles of the resin magnet 50, the magnetic path between the adjacent magnetic poles in the support portion 55 can be made the same.
  • the plurality of guide grooves 55c3 are arranged on the inner peripheral wall 55c so as to be coaxial with the shaft 1 and the second inner peripheral wall 55c2.
  • the second hollow wall 55a2 of the support portion 55 is formed with a plurality of grooves 55a3 having the same number of magnetic poles extending radially between the outer peripheral wall 55b and the second inner peripheral wall 55c2.
  • the plurality of grooves 55a3 are arranged at positions in phase with the center of the magnetic pole of the resin magnet 50.
  • the plurality of grooves 55a3 are traces of a gate which is a resin injection port formed in the cavity of the mold used when molding the yoke 52. Therefore, when the gate of the mold is not arranged at the position forming the second hollow wall 55a2, the plurality of grooves 55a3 are not formed in the second hollow wall 55a2.
  • the rotor magnet 5 can also be manufactured by other methods.
  • the yoke 52 is formed by injection molding into a mold.
  • a gate forming the above-mentioned plurality of grooves 55a3 is formed.
  • the number of gates is the same as the number of magnetic poles of the resin magnet 50. For example, when the rotor magnet 5 of the motor 100 has eight magnetic poles, eight gates are formed.
  • a magnet having a strong magnetic force such as a neodymium magnet is arranged on the outer surface of the core of the mold in which the hollow disk wall 58a of the position detection magnet portion 58 is formed, and an orientation magnetic field is formed.
  • the raw material containing the above-mentioned powder of the soft magnetic material in the thermoplastic resin is heated and melted and then injected into a mold to form the yoke 52. Further, the soft magnetic material contained in the yoke 52 is oriented in the polar direction of the alignment magnetic field by the alignment magnetic field from the outer surface of the core of the mold, and the hollow disk wall 58a of the position detection magnet portion 58 is magnetized. Formed as a square magnet.
  • the injection-molded yoke 52 After cooling, the injection-molded yoke 52 is released from the mold, and unnecessary parts such as burrs are removed by cutting or the like.
  • the injection state of the raw material of the yoke 52 at the time of injection is made uniform. Therefore, if the yoke 52 is formed so that the position of the gate of the cavity of the mold is in phase with the center of the magnetic pole of the rotor magnet 5, the orientation of the yoke 52 can be made uniform, so that the quality of the yoke 52 can be made uniform. Can be improved.
  • the position of forming the gate of the cavity of the mold may be other than the position corresponding to the second hollow wall 55a2 of the yoke 52.
  • the position of forming the gate of the cavity of the mold may be a position corresponding to the second inner peripheral wall 55c2 of the yoke 52.
  • a vertical injection molding machine is used for molding the resin magnet 50.
  • the yoke 52 formed above is inserted into the core of the mold from the second hollow wall 55a2 side of the support portion 55 and accommodated.
  • a core metal is provided in the core of the mold, and the core metal is inserted into the hollow space surrounded by the inner peripheral wall 55c of the support portion 55.
  • rails are provided at equal intervals in the circumferential direction of the core metal, and are inserted into the guide grooves 55c3 provided in the inner peripheral wall 55c.
  • a magnet having a strong magnetic force such as a neodymium magnet is arranged on the outer peripheral surface of the core of the mold facing the outer peripheral wall 55b of the support portion 55, and an orientation magnetic field is formed.
  • the core metal rail is inserted into the guide groove 55c3 provided in the inner peripheral wall 55c, and the core is pressed into the cavity by the vertical injection molding machine, so that the core metal rail is deeply inserted into the guide groove 55c3. It will be. Since the circumferential length of the guide groove 55c3 decreases from the inner circumference of the second hollow wall 55a2 toward the second inner peripheral wall 55c2, the rail of the core metal becomes deeper as it is inserted into the guide groove 55c3. The rail of the core metal is firmly fixed to the guide groove 55c3. Further, by firmly fixing the rail of the core metal to the guide groove 55c3, it is possible to suppress the deviation between the central axis of the mold and the central axis of the yoke 52.
  • the phase of the support portion 55 can be accurately positioned with respect to the orientation magnetic field, and the phase error of the support portion 55 can be suppressed.
  • the manufacturing quality of the child magnet 5 can be improved.
  • the cavity is also called the “upper mold” and the core is also called the “lower mold”.
  • a raw material containing the above-mentioned rare earth magnet or ferrite powder in a thermoplastic resin is injected into a mold after being heated and melted, and the resin magnet 50 is integrally molded on the outer peripheral wall 55b of the support portion 55. Further, the rare earth magnet or ferrite powder contained in the resin magnet 50 is oriented in the polar direction of the alignment magnetic field by the orientation magnetic field from the outer peripheral surface of the core of the mold, and the resin magnet 50 is magnetized to be anisotropic. Formed as a magnet. The resin magnet 50 is integrally molded on the support portion 55, and the resin magnet 50 is magnetized to form the rotor magnet 5.
  • the rotor magnet 5 on which the resin magnet 50 is magnetized is released from the mold after cooling. Since the position detection magnet portion 58 is formed in a tapered shape, the magnetic force between the position detection magnet portion 58 and the cavity of the mold is smaller than that in the case of the cylindrical shape. Therefore, by forming the position detection magnet portion 58 in a tapered shape, the efficiency of manufacturing the rotor magnet 5 can be improved. Further, it is possible to reduce the possibility of failure or damage of the rotor magnet 5 due to the rotor magnet 5 being pulled up together with the cavity of the mold and falling.
  • the position detection magnet portion 58 is formed in a part of the yoke 52, and the resin magnet 50 is integrally molded with the yoke 52. Therefore, between the position detection magnet portion 58 and the resin magnet 50. The phase error can be suppressed. Therefore, according to the above-mentioned manufacturing method, the quality of the rotor magnet 5 can be improved. Further, the quality of the rotor magnet 5 at the time of manufacturing the rotor magnet 5 can be made the same, and the variation in the quality of the rotor magnet 5 can be suppressed.
  • FIG. 18 is a front view of the rotor 6 according to the first embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 19 is a front view of the rotor 6 according to the first embodiment as viewed from the opposite side of the position detection magnet portion 58.
  • the wheel 7 is formed of, for example, a polyester resin such as polybutylene terephthalate resin, a polyamide resin such as nylon, or a thermoplastic resin such as acrylonitrile butadiene styrene resin.
  • a polyester resin such as polybutylene terephthalate resin
  • a polyamide resin such as nylon
  • a thermoplastic resin such as acrylonitrile butadiene styrene resin.
  • the wheel 7 can be integrally molded with the yoke 52.
  • the polybutylene terephthalate resin is abbreviated as PBT resin.
  • boss 70 connected to a portion of the peripheral surface 12 of the shaft 1 including the stopper 14.
  • the boss 70 is formed in the shape of a hollow cylinder.
  • the wheel 7 has a hollow cylindrical rim 72 connected to the inner peripheral wall 55c of the support portion 55 and the inner peripheral wall 58d of the position detection magnet portion 58. Further, the wheel 7 has a plurality of spokes 74 radially connected between the boss 70 and the rim 72. A plurality of spokes 74 are formed at equal intervals in the circumferential direction. For example, four spokes 74 are radially connected between the boss 70 and the rim 72, and are formed at equal intervals in the circumferential direction.
  • the spokes such as the number of spokes 74, the circumferential length of the spokes 74, the length between the boss 70 and the rim 72, and the axial length of the shaft 1 depending on the application of the electric motor 100.
  • the dimensions of 74 can be adjusted. For example, by reducing the number and dimensions of the spokes 74 within the strength range that can withstand the torque generated by the motor 100 or the repeated stress due to the intermittent operation of the motor 100, the material amount of the spokes 74 can be reduced, and the manufacturing cost of the motor 100 can be reduced. Can be reduced.
  • a vertical injection molding machine is used for molding the wheel 7.
  • the rotor magnet 5 is inserted into the core of the mold from the position detection magnet portion 58 and accommodated.
  • the mold cavity has a core metal that is inserted into a hollow space surrounded by an inner peripheral wall 55c. Rails are provided in the core metal at equal intervals in the circumferential direction of the core metal, and are inserted into the guide grooves 55c3 provided in the inner peripheral wall 55c.
  • the number of rails provided on the core metal can be halved from the number of magnetic poles of the resin magnet 50. When the number of magnetic poles of the resin magnet 50 is 8, the number of rails provided on the core metal is 4.
  • the shaft 1 provided with the stopper 14 is set in the center of the hollow portion of the rotor magnet 5 inserted into the core of the mold.
  • the guide groove 55c3 of the inner peripheral wall 55c is inserted into the guide groove 55c3 provided on the inner peripheral wall 55c in the core metal rail, and the core is pressed against the cavity by the vertical injection molding machine, so that the core metal rail is formed. It will be deeply inserted into the guide groove 55c3. Since the circumferential length of the guide groove 55c3 decreases as the distance from the second hollow wall 55a2 in the axial direction of the shaft 1 increases, the rail of the core metal becomes deeper in the guide groove 55c3. The rail is firmly fixed to the guide groove 55c3.
  • the above-mentioned thermoplastic resin is heated and melted and then injected into the mold, and the wheel 7 is integrally molded with the yoke 52 of the rotor magnet 5. .. Further, the wheel 7 is connected to a portion of the peripheral surface 12 of the shaft 1 including the stopper 14.
  • the inner peripheral wall 55c of the support portion 55 and the inner peripheral wall of the position detection magnet portion 58 are injected. It is possible to suppress the outflow of the thermoplastic resin other than 58d. Therefore, since the generation of burrs in the rotor magnet 5 can be suppressed, the quality of the rotor magnet 5 can be improved. Further, since the occurrence of deburring work due to cutting or the like can be suppressed, the production efficiency of the electric motor 100 can be improved.
  • Injection molding of the thermoplastic resin is performed starting from the first gate formed between the core and the cavity.
  • the number of the first gates can be halved from the number of magnetic poles of the resin magnet 50. For example, when the number of magnetic poles of the resin magnet 50 is 8, four first gates are formed.
  • the first gate is formed in the space between the inner peripheral wall 55c of the support portion 55 and the shaft 1 at a position in phase with the four guide grooves 55c3 into which the core metal rail is not inserted.
  • thermoplastic resin is injected from the first gate as a starting point, the portion of the peripheral surface 12 of the shaft 1 including the stopper 14, between the shaft 1 and the inner peripheral wall 55c of the support portion 55, and the inner peripheral wall 55c of the support portion 55. Since the boss 70 flows in order, the boss 70 can be injection-molded at the earliest. Therefore, the connection strength between the boss 70 and the shaft 1 can be improved. Further, the thermoplastic resin injected into the portion of the peripheral surface 12 of the shaft 1 including the stopper 14 flows between the shaft 1 and the inner peripheral wall 55c of the support portion 55, and the spokes 74 are formed radially.
  • thermoplastic resin flowing between the shaft 1 and the inner peripheral wall 55c of the support portion 55 flows into the inner peripheral wall 55c of the support portion 55 and the inner peripheral wall 58d of the position detection magnet portion 58, and the rim 72 is formed. ..
  • the mold may be provided with a second gate that communicates with the inner peripheral wall 55c of the support portion 55 and the inner peripheral wall 58d of the position detection magnet portion 58.
  • the rim 72 can be injection-molded at the earliest, so that the connection strength between the rim 72 and the yoke 52 can be improved.
  • the thermoplastic resin injected into the inner peripheral wall 55c of the support portion 55 flows into the space between the shaft 1 and the inner peripheral wall 55c of the support portion 55, and the spokes 74 are formed radially.
  • the thermoplastic resin flowing between the shaft 1 and the inner peripheral wall 55c of the support portion 55 flows into the portion of the peripheral surface surface 12 of the shaft 1 including the stopper 14, and the boss 70 is formed.
  • the core of the mold can be installed on the turntable of the vertical injection molding machine and rotated 180 degrees at a predetermined rotation speed to form the wheel 7.
  • the boss 70 and the rim 72 can be injection-molded at the same time by injecting the thermoplastic resin in two injection patterns using the first gate and the second gate. Therefore, if a turntable is used for molding the wheel 7, the speed of injection molding of the wheel 7 can be improved, and both the connection strength between the boss 70 and the shaft 1 and the connection strength between the rim 72 and the yoke 52 can be improved. ..
  • the position of the anchor 58b protruding from the inner circumference of the position detection magnet portion 58 and the position of the four guide grooves 55c3 into which the core metal rail is not inserted are also thermoplastic.
  • the resin is filled so that it is buried.
  • the torque of the rotor magnet 5 is transmitted to the wheel 7 via the anchor 58b. Further, by filling the position of the anchor 58b so that the thermoplastic resin is embedded, it is possible to prevent the wheel 7 from rotating out of synchronization with the rotor magnet 5. Therefore, by filling the position of the anchor 58b so that the thermoplastic resin is embedded, the torque of the rotor magnet 5 can be efficiently transmitted to the shaft 1 via the anchor 58b and the wheel 7.
  • the rim 72 is moored in the guide groove 55c3, so that the rim 72 is formed and shrunk by cooling. Even in this case, the contraction of the rim 72 in the circumferential direction is suppressed. Therefore, since the guide groove 55c3 into which the core metal rail is not inserted is filled with the thermoplastic resin, the shrinkage of the rim 72 in the circumferential direction can be suppressed, so that a gap is generated between the rim 72 and the yoke 52. Can be suppressed. Further, since it is possible to suppress the generation of a gap between the rim 72 and the yoke 52, it is possible to suppress a decrease in the connection strength between the rim 72 and the yoke 52.
  • the wheel 7 is released from the mold after cooling. In the wheel 7 released from the mold, unnecessary parts such as burrs are removed by cutting or the like.
  • four gate processing marks 76 radially extending from the outer periphery of the boss 70 are formed on the outer periphery of the boss 70 at equal intervals in the circumferential direction of the wheel 7.
  • the shape of the gate processing trace 76 can be formed so as to be a convex shape when viewed from the tip end side of the gate processing trace 76. Since the tip of the gate processing trace 76 is arranged apart from the rim 72, the gate processing trace 76 does not interfere with the rim 72.
  • the gate processing trace 76 is arranged apart from the adjacent spokes 74 in the circumferential direction of the wheel 7, it does not interfere with the spokes 74. Further, since the gate processing traces 76 are formed at equal intervals in the circumferential direction of the wheel 7, the rotational movement of the rotor magnet 5 is not unstable. Therefore, according to the injection molding of the thermoplastic resin from the first gate, it is possible to leave the gate processing mark 76 on the wheel 7 without cutting it, so that the manufacturing efficiency of the wheel 7 can be improved.
  • the core metal and the rail of the core metal are formed in the cavity of the mold, but they may be formed in the core of the mold.
  • the rotor magnet 5 is inserted into and accommodated in the core of the mold from the second hollow wall 55a2 of the support portion 55.
  • the rotor 6 includes the shaft 1, the rotor magnet 5, and the wheel 7, but the rotor 6 may be the one in which the shaft 1 and the wheel 7 are omitted.
  • FIG. 20 is a front view of the rotor magnet 5 according to the second embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 21 is a side view of the rotor magnet 5 according to the second embodiment as viewed from the outer peripheral surface side.
  • the width D1 of the resin magnet 50 in the axial direction of the resin magnet 50 is formed to be shorter than the width D2 of the support portion 55.
  • the axial direction of the resin magnet 50 is the same as the axial direction of the shaft 1. Since the other configurations of the rotor magnet 5 are the same as those in the first embodiment, the description thereof will be omitted.
  • the material cost of the resin magnet 50 can be reduced.
  • the magnetic material such as a rare earth magnet used for forming the resin magnet 50 is more expensive than the soft magnetic material such as iron or silicon rope used for forming the support portion 55.
  • the magnetic material such as a rare earth magnet used for forming the resin magnet 50 is more expensive than the soft magnetic material such as iron or silicon rope used for forming the support portion 55. Therefore, by making the width D1 of the resin magnet 50 shorter than the width D2 of the support portion 55, the material cost of the resin magnet 50 can be reduced.
  • the width D1 of the resin magnet 50 is made shorter than the width D2 of the support portion 55, the circumferential surfaces at both ends of the support portion 55 in the axial direction radiate toward the stator 2 as in the resin magnet 50. It can be magnetized to generate a magnetic field.
  • the width D2 of the support portion 55 is formed to have the same width as the tip wall 23b1 of the teeth 23b of the stator 2, and the support portion 55 can be arranged at the same position as the tip wall 23b1. Therefore, by magnetizing the resin of the support portion 55, the magnetism of the support portion 55 can be used for the rotational movement of the rotor magnet 5 instead of a part of the resin magnet 50. Therefore, according to the above configuration, it is possible to provide the rotor magnet 5 capable of reducing the manufacturing cost of the electric motor 100 while maintaining the rotational efficiency of the electric motor 100.
  • FIG. 22 is a front view of the rotor magnet 5 according to the third embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 23 is a side view of the rotor magnet 5 according to the third embodiment as viewed from the outer peripheral surface side.
  • FIG. 24 is a side view including a partial cross section of the motor 100 according to the third embodiment as viewed from the circumferential surface of the rotor magnet 5.
  • FIG. 25 is an enlarged view of the area B of FIG. 24.
  • the second hollow wall 55a2 which is the other end portion 55a of the support portion 55 is the end portion of the resin magnet 50. It is formed so as to be in the same position as. Further, the first hollow wall 55a1, which is one end 55a of the support portion 55, forms a cylindrical surface having the same radius R2 as the radius R1 of the resin magnet 50. Since the other configurations of the rotor magnet 5 are the same as those in the first and second embodiments described above, the description thereof will be omitted.
  • the cylindrical surface of the first hollow wall 55a1 By making the cylindrical surface of the first hollow wall 55a1 a cylindrical surface having the same radius R2 as the radius R1 of the resin magnet 50, the cylindrical surface of the first hollow wall 55a1 is formed on the same plane as the cylindrical surface of the resin magnet 50. It can be magnetized so as to generate a magnetic field radially toward the stator 2. Further, in addition to the magnetic force generated from the cylindrical surface of the resin magnet 50 by magnetizing the cylindrical surface of the first hollow wall 55a1, the magnetic force generated from the cylindrical surface of the first hollow wall 55a1 is used to drive the rotation of the rotor magnet 5. be able to.
  • the magnetic force for driving the rotation of the rotor magnet 5 can be improved at low cost.
  • the resin magnet 50 is arranged at the same position and width as the tip wall 23b1 of the teeth 23b of the stator 2 in the axial direction of the shaft 1, the magnetic force of the rotor magnet 5 can be further improved at low cost. can.
  • the drive efficiency of the motor 100 can be improved at low cost, so that the motor 100 with high cost bearing capacity can be provided.
  • the magnetic flux leaked from the coil 27 of the stator 2 flows toward the position detection magnet portion 58, and the magnetic detector 29 of the stator 2 obtains accurate magnetic information. It may not be possible.
  • the resin magnet 50 is arranged at the same position and the same width as the tip wall 23b1 of the teeth 23b of the stator 2 in the axial direction of the shaft 1, the magnetic flux leaked from the coil 27 of the stator 2 is the first. It can be blocked or suppressed by the cylindrical surface of the hollow wall 55a1.
  • leakage of magnetic flux from the coil 27 can be suppressed, and magnetic information from the position detection magnet portion 58 of the rotor magnet 5 can be provided to the magnetic detector 29 of the stator 2 with high accuracy. Therefore, it is possible to suppress the malfunction of the electric motor 100 due to the leakage of the magnetic flux from the coil 27. Further, according to the above configuration, the malfunction of the electric motor 100 due to the leakage of the magnetic flux from the coil 27 can be suppressed, so that the quality of the electric motor 100 can be improved.
  • FIG. 26 is a front view of the rotor magnet 5 according to the fourth embodiment as viewed from the position detection magnet portion 58 side.
  • FIG. 27 is a side view of the rotor magnet 5 according to the fourth embodiment as viewed from the outer peripheral surface side.
  • FIG. 28 is a side view including a partial cross section of the motor 100 according to the fourth embodiment as viewed from the circumferential surface of the rotor magnet 5.
  • the first hollow wall 55a1 which is one end portion 55a of the support portion 55 is the end portion of the resin magnet 50. It is formed so as to be in the same position as. Further, the second hollow wall 55a2, which is the other end portion 55a of the support portion 55, forms a cylindrical surface having the same radius R3 as the radius R1 of the resin magnet 50. Since the other configurations of the rotor magnet 5 are the same as those in the first and second embodiments described above, the description thereof will be omitted.
  • the cylindrical surface of the second hollow wall 55a2 By making the cylindrical surface of the second hollow wall 55a2 a cylindrical surface having the same radius R3 as the radius R1 of the resin magnet 50, the cylindrical surface of the second hollow wall 55a2 is formed on the same plane as the cylindrical surface of the resin magnet 50. It can be magnetized so as to generate a magnetic field radially toward the stator 2. Further, in addition to the magnetic force generated from the cylindrical surface of the resin magnet 50 by magnetizing the cylindrical surface of the second hollow wall 55a2, the magnetic force generated from the cylindrical surface of the second hollow wall 55a2 is used to drive the rotation of the rotor magnet 5. be able to.
  • the magnetic force for driving the rotation of the rotor magnet 5 can be improved at low cost.
  • the resin magnet 50 is arranged at the same position and width as the tip wall 23b1 of the teeth 23b of the stator 2 in the axial direction of the shaft 1, the magnetic force of the rotor magnet 5 can be further improved at low cost. can.
  • the drive efficiency of the motor 100 can be improved at low cost, so that the motor 100 with high cost bearing capacity can be provided.
  • the electric motor 100 of the present disclosure is also applicable to an integrated air conditioner 1000 having a blower 500. Further, the electric motor 100 of the present disclosure can be applied not only to the air conditioner 1000 but also to electric equipment such as a refrigeration cycle device having another blower 500.
  • the electric motor 100 of the present disclosure can also be applied as a pressure reducing device such as a linear flow rate adjusting valve of the air conditioner 1000 or a stepping motor for driving the vane 250 of the indoor unit 200.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Brushless Motors (AREA)

Abstract

Ce rotor est pourvu d'une culasse formée de manière cylindrique et d'un aimant de rotor ayant un aimant en résine formé d'un seul tenant sur la circonférence extérieure de la culasse. La culasse comporte une partie aimant de détection de position à une extrémité de la culasse dans la direction axiale. Le moteur électrique, le ventilateur et le climatiseur sont dotés du rotor ci-dessus.
PCT/JP2020/019803 2020-05-19 2020-05-19 Rotor, moteur électrique, ventilateur et climatiseur WO2021234822A1 (fr)

Priority Applications (2)

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PCT/JP2020/019803 WO2021234822A1 (fr) 2020-05-19 2020-05-19 Rotor, moteur électrique, ventilateur et climatiseur
PCT/JP2021/004210 WO2021235017A1 (fr) 2020-05-19 2021-02-05 Rotor, moteur électrique, ventilateur et climatiseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/019803 WO2021234822A1 (fr) 2020-05-19 2020-05-19 Rotor, moteur électrique, ventilateur et climatiseur

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PCT/JP2021/004210 WO2021235017A1 (fr) 2020-05-19 2021-02-05 Rotor, moteur électrique, ventilateur et climatiseur

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WO2016203609A1 (fr) * 2015-06-18 2016-12-22 三菱電機株式会社 Moteur électrique, et appareil de conditionnement d'air
WO2018003114A1 (fr) * 2016-07-01 2018-01-04 三菱電機株式会社 Rotor, moteur électrique, climatiseur et procédé de fabrication de rotor
US20180041100A1 (en) * 2015-03-17 2018-02-08 Sunsik KIM Method for manufacturing impeller rotor assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007221866A (ja) * 2006-02-15 2007-08-30 Mitsubishi Electric Corp 電動機の回転子及び電動機及び空気調和機
JP2008236960A (ja) * 2007-03-23 2008-10-02 Mitsubishi Electric Corp 電動機の回転子及び電動機及び空気調和機及び電動機の回転子の製造方法
JP2012151979A (ja) * 2011-01-18 2012-08-09 Mitsubishi Electric Corp 電動機の回転子及びモールド電動機及び空気調和機及びモールド電動機の製造方法
JP2014180117A (ja) * 2013-03-14 2014-09-25 Hitachi Automotive Systems Ltd 回転電機
US20180041100A1 (en) * 2015-03-17 2018-02-08 Sunsik KIM Method for manufacturing impeller rotor assembly
WO2016203609A1 (fr) * 2015-06-18 2016-12-22 三菱電機株式会社 Moteur électrique, et appareil de conditionnement d'air
WO2018003114A1 (fr) * 2016-07-01 2018-01-04 三菱電機株式会社 Rotor, moteur électrique, climatiseur et procédé de fabrication de rotor

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