WO2004017489A1 - 回転電機のマグネット - Google Patents
回転電機のマグネット Download PDFInfo
- Publication number
- WO2004017489A1 WO2004017489A1 PCT/JP2003/010387 JP0310387W WO2004017489A1 WO 2004017489 A1 WO2004017489 A1 WO 2004017489A1 JP 0310387 W JP0310387 W JP 0310387W WO 2004017489 A1 WO2004017489 A1 WO 2004017489A1
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- WIPO (PCT)
- Prior art keywords
- magnetic pole
- magnet
- pole portions
- inter
- magnetic
- Prior art date
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Classifications
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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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
- H02K1/2795—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/52—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by DC-motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/66—Arrangements of batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/30—In-wheel mountings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/12—Bikes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/40—Electrical machine applications
- B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/421—Speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2270/00—Problem solutions or means not otherwise provided for
- B60L2270/10—Emission reduction
- B60L2270/14—Emission reduction of noise
- B60L2270/142—Emission reduction of noise acoustic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2270/00—Problem solutions or means not otherwise provided for
- B60L2270/10—Emission reduction
- B60L2270/14—Emission reduction of noise
- B60L2270/145—Structure borne vibrations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Definitions
- the present invention relates to a magnet for an axial gap type rotating electric machine.
- an axial-gap-type electric motor serving as the axial-gap-type rotating electric machine includes a disk-shaped rotor-side yoke having a rotating shaft supported by its bearing, for example, a circular motor.
- the stator-side yoke which is a laminate in which plate-shaped steel sheets are laminated along the central axis direction, faces each other, and the facing surface is orthogonal to the rotation axis.
- a magnetic field for example, is arranged in a circular shape (annular shape) on the opposing surface of the rotor-side yoke, and the magnet is arranged in the circumferential direction. It has magnetic poles (N-pole, S-pole) alternately arranged along.
- the opposite surface of the yoke on the stator side A plurality of teeth are provided along the radial direction (radial direction), and the opposing surfaces of the magnet and the tooth are orthogonal to the rotation axis, and the gap between the opposing surfaces is It is formed in a plane perpendicular to the rotation axis.
- a magnetic circuit is formed between the rotor and the stator, and each tee is wound via a coil wound around each tooth of the stator.
- the induced voltage waveform changes from a sinusoidal waveform to a distorted waveform, torque ripple occurs, the rotation of the rotor becomes uneven, and vibration and noise may occur. Had occurred.
- Japanese Patent Application Laid-Open No. 2001-577753 discloses that a groove is formed by cutting a boundary between a plurality of magnetic poles affixed to a rotor core, and a motor is driven.
- a configuration for reducing the pulsation of Luke is disclosed. 2003/010387
- the present invention has been made in view of the above-described circumstances, and is to make an induced voltage waveform closer to a sine waveform when a rotor rotates and a magnetic pole of a magnet facing each tooth switches. It is an object of the present invention to provide a magnet for a rotating electric machine that realizes the above without deteriorating the assemblability of the rotor.
- a magnet of a rotating electrical machine includes a plurality of teeth arranged in a substantially circular shape with a gap interposed therebetween along a rotation axis direction.
- a plurality of magnetic pole portions facing each other and arranged in a substantially circular shape, and extending in a circumferential direction from each of the adjacent magnetic pole portions of the plurality of magnetic pole portions, and facing the teeth of the magnetic pole portion.
- a plurality of inter-pole portions having a tooth-facing surface that is recessed along the rotation axis direction from a surface to be formed.
- a magnet for a rotating electric machine includes a plurality of teeth arranged in a substantially circular shape, with a gap interposed therebetween along the rotation axis direction.
- a plurality of magnetic pole portions arranged in a substantially circular shape, and extending in a circumferential direction from each of the adjacent magnetic pole portions of the plurality of magnetic pole portions, and facing the teeth of the magnetic pole portion.
- a plurality of inter-pole portions having a tooth-facing surface that is recessed along the rotation axis direction from the surface, and a radial width of the inter-pole portion is defined as a radial width of each of the magnetic pole portions.
- the length of at least one of the inner peripheral side and the outer peripheral side of the portion between the magnetic poles along the radial direction from the rotation shaft is set so as to be narrower than that of the magnetic pole.
- the length of the corresponding peripheral part in each magnetic pole part is made different.
- the inner peripheral portion of the inter-magnetic pole portion is recessed toward the outer peripheral portion of the inter-magnetic pole portion rather than the inner peripheral portion of each of the magnetic pole portions to form a concave inner peripheral portion.
- the plurality of magnetic pole portions and the plurality of inter-magnetic pole portions are resin magnet portions integrally formed of a resin material.
- the magnetic flux between the magnetic poles is made smaller than that of the adjacent magnetic poles. Also, the magnetic flux can be smoothly changed with respect to the rotation of the rotor (rotation of the magnetic pole part).
- the induced voltage waveform corresponding to the intersecting magnetic flux between the rotor magnet and the teeth can be approximated to a sine wave, and the occurrence of torque ripple is suppressed to reduce the rotation of the rotor.
- FIG. 1 is a side view of an electric motorcycle which is an example of a device equipped with an axial gap type rotating electric machine including a magnet of a rotating electric machine according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view (partial side view) taken along the line II-II of FIG. 1 for explaining the inside of the rear end of the rear arm shown in FIG. -FIG. 3 is a plan view showing a state in which the rotor according to the embodiment of the present invention, to which the magnet is fixed, is viewed from the stator side shown in FIG.
- FIG. 4 is a cross-sectional view taken along the line IV-IV of the rotor shown in FIG.
- FIG. 5 is an enlarged perspective view showing a portion between the magnetic poles shown in FIG.
- FIGS. 6A to 6C are diagrams showing the positional relationship between the rotor shown in FIGS. 2 and 3 and the teeth when the rotor is rotated.
- FIG. 7A is a diagram showing the relationship between the magnet amount of the conventional magnet and the magnet amount of the present invention (the present embodiment).
- Fig. 7B shows the ratio between the induced voltage distortion factor of the electric motor using the magnet of the conventional example and the induced voltage distortion factor of the electric motor using the magnet of the present invention (the present embodiment). 2003/010387
- FIG. 1 A first figure.
- FIG. 8 is a diagram showing a magnet according to a first modification of the embodiment of the present invention. ⁇
- FIG. 9 is a diagram showing a magnet according to a second modification of the embodiment of the present invention.
- FIG. 10 is a diagram showing a magnet according to a third modification of the embodiment of the present invention.
- FIG. 11 is a diagram showing a magnet according to a fourth modification of the embodiment of the present invention.
- FIG. 1 is a side view of an electric motorcycle 1 on which an axial gear-type rotary electric machine, which is an example of a rotary electric machine using a magnet according to an embodiment of the present invention, is mounted.
- the electric motorcycle 1 is provided with a head tip 2 at an upper front portion of the vehicle body, and inside the head tip and the tip, an unillustrated part for changing the direction of the car body is provided.
- the steering shaft is rotatably inserted.
- a handle support 3 to which the handle 3a is fixed is attached, and both ends of the handle 3a are attached to both ends.
- Top 4 is installed.
- a pair of left and right front forks 5 are attached downward from the lower end of the head pipe 2.
- a front wheel 6 is mounted via a front axle 7, and the front wheels 6 are buffered and suspended by the front forks 5. In this state, it is rotatably supported by the front axle 7.
- a meter 8 is arranged in front of the handle 3 a of the handle 3, and a head lamp 9 is fixed below the meter 8 in the handle 3.
- a flash lamp 10 (only one is shown in FIG. 1) is provided on each side of the head lamp 9.
- a pair of left and right body frames 11 each forming an approximately L-shape in side view extend from the head pipe 2 toward the rear of the body.
- the body frame 11 has a round pipe shape, extends diagonally downward from the head pipe 2 toward the rear of the vehicle body, and then extends horizontally toward the rear to be substantially L-shaped in side view. Has been established.
- a pair of left and right seat rails 12 extend diagonally upward from the rear end to the rear from the rear end of the pair of body frames 11.
- the rear end 12 a of the seat reel 12 is bent rearward along the shape of the seat 13.
- a battery 14 is detachably provided, and the battery 14 houses a plurality of rechargeable rechargeable batteries.
- an inverted U-shaped seat stay 15 is welded so as to be inclined upward toward the front of the vehicle body.
- the sheet 13 is openable and closable in a portion surrounded by the sheet 15 and the left and right sheet rails 12, that is, the sheet 13 is arranged to be rotatable up and down via the front end of the sheet 13.
- the rear end of the seat rail 12 is provided with a rear hender 16, and the rear end of the rear hender 16 is provided with a tile lamp 17. It is attached.
- a flash lamp (only one is shown in FIG. 1) 18 is attached to the left and right of the tile lamp 17.
- the rear arm bracket 19 (only one is shown in Fig. 1) is welded to the lower part of the seat 13 of the pair of left and right body frames 11 1.
- the front ends of the rear arms 20 are swingably supported by the pair of rear arm brackets 19 via pivot shafts 21.
- a rear wheel 22 as a drive wheel is rotatably supported at the rear end 20a of the rear arm 20.
- the wheel 22 is buffer-suspended by the reaction 23.
- a pair of footsteps 24 (only one is shown in FIG. 1) are provided, and a side stand 25 is connected to the rear side of the footstep 24 via an axis 26. It is rotatably supported by the left rear arm 20, and the side stand 25 is urged to the closed side by the return spring 27. .
- An axial gap type electric motor 28 (hereinafter simply referred to as an electric motor) connected to a rear wheel 22 and thereafter rotating the wheel 22 is provided in a rear end 20 a of the rear arm 20.
- a drive unit 29 including an abbreviated as 28 may be installed.
- FIG. 2 is a cross-sectional view (partial side view) taken along the line II-II of FIG. 1 for explaining the inside of the rear end portion 20a of the rear arm 20.
- the rear wheel 22 is not shown.
- a gear cover 35 is attached to the right side of the rear end 20 a of the rear arm 20, and a drive unit 29 is formed in a space formed therein.
- the electric motor 28, the planetary gear reducer 36, the controller 37, etc. are integrally incorporated.
- the axial gap type electric motor 28 has a bearing 3 a with respect to a rear end 20 a of the rear arm 20 through bearings 38 a and 38 b.
- a rotor (mouth) 40 rotatably supported about the center axis B ⁇ of 8 a and 38 b, and a rear end of the rim facing the rotor 40. It has a substantially annular (doughnut) -shaped stator (stay-night) 41 fixed to the inner surface of 10 parts 20a.
- the rotor 40 has a rotor side yoke 42.
- the rotor side yoke 42 is provided at the rear end of the rear arm 20. Forming a convex piece toward 20 a
- the rotor side yoke 42 has an annular annular portion 42 a facing the stator 41, and a rear end of the rear arm 20 from an inner peripheral portion of the annular portion 42 a.
- a portion of the taper 42b extending toward the portion 20a in a substantially tapered shape (substantially frustoconical shape), and a limb of the tapered portion 42b.
- a first cylindrical portion 4 2c that protrudes along the central axis B 0 from the rear end portion 20a side peripheral portion to the rear end portion 20a, and a cylindrical portion 4 2c A rear end portion of the climbing beam 20a
- An annular portion 42d extending radially inward from the side peripheral portion and an inner peripheral portion of the annular portion 42d.
- a second cylindrical portion 42 e extending convexly from the portion toward the rear end portion 20 a along the central axis BO.
- the second cylindrical portion 42e is rotatably supported about a central axis B0 via bearings 38a, 38b, and the rotation of the rotor 40 is performed. Make up the axis. Therefore, the center of the rotation axis of the rotation axis 42 e of the rotor 40 is aligned with the center axis B 0 of the bearings 38 a and 38 b.
- the rotor 40 is a ring part 4 of the rotor side yoke 42. 2a, which is fixed to the stator-side facing surface and has a substantially circular shape (annular shape) coaxial with the center axis BO.
- a rotating shaft 46 is connected coaxially with the rotor 40 (rotating shaft 42 e) at the rear wheel end of the rotating shaft 42 e of the rotor 40.
- the shaft 46 is rotatable together with the rotor 40.
- the planetary gear reducer 36 is connected to the rotating shaft 46 and is incorporated in the taper portion 42 b of the rotor side yoke 42.
- the planetary gear reducer 36 and the electric motor 28 partially overlap in the vehicle width direction.
- the planetary gear reducer 36 is arranged coaxially with the rotating shaft 46.
- the motor is connected to the rear axle 47 and has the function of reducing the rotation of the electric motor 28 (rotation of the rotating shaft 46) and transmitting it to the rear axle 47.
- a nut 50 is detachably screwed onto a tip portion 47a of the rear axle 47 protruding from the gear bar 35, and the rear wheel 22 is fitted to the rear axle 47. It is attached by screwing nuts 50 in the closed state.
- stator side of the laminated structure (yoke) They are arranged in a substantially circular shape so as to face each other with a gap therebetween, and include a plurality of teeth 61 each made of a laminated body of steel plates.
- the magnet 45 sandwiches a gap along the direction of the rotation axis BO with respect to the plurality of teeth 61 arranged in a substantially circular shape as described above. And a plurality of magnetic pole portions 45a (N pole) and 45b (S pole) arranged in a substantially circular shape.
- the N pole portion 45a and the S pole portion 45b are alternately arranged along the circumferential direction.
- the magnet 45 is formed between a plurality of magnetic poles extending in the circumferential direction from adjacent magnetic poles in the plurality of magnetic poles (N pole 45 a and S pole 45 b).
- a part 45c is provided, and the boundary of the magnetic poles (boundary between the N pole and the S pole) Bm exists along the substantially radial direction at the approximate center of the part 45c between the magnetic poles.
- FIG. 4 is an enlarged view of a portion 45 c between magnetic poles shown in FIG.
- the inter-pole portion 45c is located between the tooth-facing surfaces of the adjacent magnetic pole portions (N-pole portion 45a and S-pole portion 45b).
- the recess is also concavely curved along the rotation axis direction, and has a concave tooth-facing surface.
- the area of the concave tooth facing surface of the magnetic pole portion 45c is smaller than the N pole portion 45a and the S pole portion 45b on both sides.
- the torque is reduced compared to when there is no concave magnetic pole gap. It can be kept constant.
- the depth of the concave portion of the inter-magnetic pole portion 45c along the rotation axis direction and the radius of curvature of the concave portion of the curved surface are set to a length at which a change in magnetic flux described later becomes smooth.
- the magnets 45 are, for example, resin magnets (bonded magnets). It is produced by molding a resin (mixture) obtained by mixing (compounding) a resin with a resin into an annular shape by injection molding. Next, the operation of the electric motor 28 using the magnet 45 having the above-described configuration will be described.
- a magnetic circuit is formed between the rotor 40 and the stator 41, and the magnetic flux emitted from the N pole of the magnet 45 of the rotor 40. Flows through the teeth 61 to the stator-side yoke 60, and flows to the south pole of the magnet 45 through the other teeth 61.
- the excitation via controller 37 etc.
- the excited magnets 61 are sequentially moved, and the rotor 40 is rotated together with the magnet 45.
- FIGS. 6A to 6C show the positional relationship with the teeth 61 (indicated by a two-dot chain line) when the rotor 40 rotates.
- the teeth opposing between the magnetic pole portions (the N pole portion 45a and the S pole portion 45b) of the magnet 45 are provided. Since the surface is provided with an inter-pole portion 45c which is recessed from the magnetic pole portions 45a and 45b, the magnetic flux in the concave pole portion 45c is reduced, and the N pole 4 of the rotor 40 is reduced. The magnetic flux changes smoothly as 5a and 45b transition from one given tooth 61 to the next.
- FIG. 7A shows the magnet amount M 0 of the conventional magnet (when there is no concave magnetic pole portion) when the torque is kept constant and the magnet 45 of the present embodiment.
- FIG. 6 is a diagram showing the relationship between the amount of magnetism and the amount of magnetism (the vertical axis represents the amount of magnetism).
- Fig. 7B shows a conventional example (where the concave magnetic pole gap is The ratio of the induced voltage distortion (the amount of harmonic components) in the electric motor using the magnet of the present embodiment to the induced voltage distortion in the electric motor 28 using the magnet 45 of the present embodiment.
- FIG. 7A shows the magnet amount M 0 of the conventional magnet (when there is no concave magnetic pole portion) when the torque is kept constant and the magnet 45 of the present embodiment.
- FIG. 6 is a diagram showing the relationship between the amount of magnetism and the amount of magnetism (the vertical axis represents the amount of magnetism).
- Fig. 7B shows a conventional example (where the concave magnetic pole
- the magnet 45 of the present embodiment has a concave portion 45 c between the magnetic poles while maintaining the torque, so that the magnet corresponding to the concave portion is formed. It is possible to reduce the cutting amount (for example, about 11.4%), which can contribute to the cost reduction of rotating electrical machines.
- the induced voltage distortion factor in the electric motor 28 using the magnet 45 of the present embodiment is the same as that of the conventional electric motor using the magnet. Compared to the induced voltage distortion factor in the evening, it is reduced to about 1/7, and the induced voltage waveform due to the intersecting magnetic flux can be approximated to a sine waveform.
- the tooth facing surface has the magnetic pole part 45 a and With the provision of the concave magnetic pole portion 45 c that is more concave than that of the rotor 45, it corresponds to the intersecting magnetic flux between the magnet 45 of the rotor 40 and the teeth 61.
- the induced voltage waveform can be approximated to a sine wave, and the occurrence of torque ripple can be suppressed, the smooth rotation of the rotor 40 can be maintained, and the generation of vibration and noise can be prevented.
- the magnet 45 is configured.
- the plurality of magnetic pole portions 45a, 45b and the plurality of magnetic pole portions 45c are integrally formed into an annular shape by injection molding using, for example, a resin obtained by mixing magnet powder and a binder resin. Generated.
- the N poles 45a and 45b are concavely curved to provide the concave magnetic pole portion 45c.
- the shape of the concave portion is not limited to a curved surface, but may be a rectangular shape. It can take any shape, such as shape.
- FIG. 8 is a diagram showing a magnet 70 according to a first modification of the present embodiment.
- a magnet 70 is a resin magnet integrally formed by, for example, injection molding, and includes a plurality of teeth 61 arranged in a substantially circular shape as described above. And a plurality of magnetic pole portions 70a (N pole) and 7Ob (S pole) disposed in a substantially circular shape and opposed to each other with a gap along the rotation axis B ⁇ direction. .
- the N pole portion 70a and the S pole portion 70b are alternately arranged along the circumferential direction.
- the magnet 70 is formed between a plurality of magnetic poles extending in the circumferential direction from adjacent magnetic poles in the plurality of magnetic poles (N pole 70 a and S pole 70 b).
- a portion 70c is provided, and the boundary of the magnetic pole (boundary between the N pole and the S pole) Bm substantially along the radial direction is present substantially at the center of the portion 70c between the magnetic poles.
- the length L1 along the radial direction from the rotation axis BO with respect to the inner peripheral portion 71 of the inter-pole portion 70c is defined as the length of each of the pole portions 70a and 70b.
- the inner circumferential portion 72 is longer than the length L 2, and the radial width W 1 of the magnetic pole portion 70 c is set to the radial width of each magnetic pole portion 70 a and 70 b. It is shorter than W2.
- the inner peripheral portion 71 of the inter-magnetic pole portion 70c is larger than the inner peripheral portion 72 of the magnetic pole portions 70a and 70b. Outside the gap between the magnetic poles 70 c
- the inner peripheral portion 71 is a concave inner peripheral portion by being recessed in a rectangular shape toward the peripheral portion 73.
- each of the magnetic pole portions 70a and 70b projects in a rectangular shape toward the rotation axis B #.
- the induced voltage waveform corresponding to the intersecting magnetic flux between the magnet 70 of the rotor 40 and the tooth 61 can be approximated to a sine wave, and the occurrence of torque ripple can be reduced.
- smoothness of rotation of the rotor 40 can be maintained, and generation of vibration and noise can be prevented.
- the plurality of magnetic pole portions 70 a and 70 b and the plurality of inter-magnetic pole portions 70 c constituting the magnet 70 are formed.
- it is produced by integrally molding an annular shape by injection molding using a resin obtained by mixing magnet powder and a binder resin.
- the number of parts of the rotor 40 is not increased, and the assembly of the rotor 40 is not performed. While maintaining high performance, the effect of reducing torque ripple can be obtained.
- FIG. 9 is a diagram showing a magnet 80 according to a second modification of the present embodiment.
- This magnet 80 is also a resin magnet integrally formed by, for example, injection molding, and has a plurality of magnetic pole portions 80 a and 70 ob equivalent to the magnetic pole portions 70 a and 70 ob shown in FIG. a (N-pole), 80 (S-pole), and a plurality of inter-pole portions 80c. At the approximate center of the inter-pole portion 80c, the boundary of the magnetic poles along the substantially radial direction ( The boundary between the north and south poles) B m exists.
- the length L 3 along the radial direction from the rotation axis B ⁇ ⁇ ⁇ ⁇ with respect to the inner peripheral portion 81 of the inter-pole portion 80 c is defined as the length of each pole portion 80 a.
- 80b are longer than the length L4 of the inner peripheral portion 82, and the radial width W3 of the portion 80c between the magnetic poles is defined by the magnetic pole portions 80a and 80b. It is shorter than the radial width W 4 of.
- the inner peripheral portion 81 of the inter-pole portion 80 c is made to be closer to the outer peripheral portion 83 of the inter-pole portion 80 c than to the inner peripheral portion 82 of each of the magnetic pole portions 80 a and 80 b.
- the inner peripheral portions 82 of the magnetic pole portions 80a and 80b are projected in a curved shape toward the rotation axis BO.
- the inner peripheral portion 81 is provided with the inter-magnetic pole portion 80 c that is recessed from the inner peripheral portion 82 of each of the magnetic pole portions 80 a and 80 b, the concave magnetic pole is provided. Between 80 c The magnetic flux decreases, and the magnetic flux accompanying rotation of the rotor 40 can be smoothly changed. As a result, an effect similar to that of the first modified example can be obtained.
- FIG. 10 is a diagram showing a magnet 90 according to a third modification of the present embodiment.
- This magnet 90 is also a resin magnet integrally formed by, for example, injection molding, and has a plurality of magnetic pole portions 90 a (N pole), 90 substantially the same as those of the first and second modifications. 0 b (S pole), and a plurality of inter-pole portions 90 c, and substantially at the center of the inter-pole portion 90 c, a magnetic pole boundary (N pole and S The pole boundary) B m exists.
- the length L5 along the radial direction from the rotation axis BO with respect to the inner peripheral portion 91 of the inter-pole portion 90c is set to each of the magnetic pole portions 90a and 90a.
- the inner width 92 of the 90 b is longer than the length L 6 of the inner circumference 92, and the radial width W 5 of the inter-pole portion 90 c is defined by the diameter of each of the magnetic pole portions 90 a and 90 b. It is shorter than the width W6 in the direction.
- the inner circumference 91 of the inter-pole portion 90 c is smaller than the inner circumference 92 of each of the magnetic pole portions 90 a and 90 b. It is recessed in a substantially V-shape toward the outer peripheral portion 93 of the inter-pole portion 90 c, and the inner peripheral portion '92 of each of the magnetic pole portions 90 a and 90 b is substantially moved toward the rotation axis BO. It is projected in an inverted V shape.
- the inner peripheral portion 91 is Since the magnetic pole portion 90 c is recessed from the inner peripheral portion 92 of the portions 90 a and 90 b, the magnetic flux of the concave magnetic pole portion 90 decreases, and the rotation of the rotor 40 is reduced. The magnetic flux associated with the change can be changed smoothly. As a result, the same effect as in the first and second modifications can be obtained.
- the length along the radial direction from the rotation axis B0 with respect to the inner peripheral portion of the magnetic pole portion is defined as the length of the inner peripheral portion of each magnetic pole portion.
- FIG. 11 is a diagram showing a magnet 100 according to a fourth modification of the present embodiment.
- the magnet 100 is a resin magnet integrally formed by, for example, injection molding, and has a plurality of magnetic pole portions substantially equivalent to those of the first to third modifications.
- 100 a N-pole
- 100 b S-pole
- inter-pole portions 100 c are provided.
- the length L 7 along the radial direction from the rotation axis B ⁇ with respect to the outer peripheral portion 101 of the inter-pole portion 100 c is defined as the length of each magnetic pole portion 100.
- a and 100 b are shorter than the length L 8 of the outer peripheral portion 102, and the radial width W 7 of the inter-pole portion 100 c is set to each of the magnetic pole portions 100 a and 100 a. And shorter than the radial width W 8 of 100 b.
- the outer periphery 101 of the inter-pole portion 100 c is separated from the outer periphery of the magnetic pole portions 100 a and 100 b.
- 0 2 is projected in a substantially rectangular shape from the rotation axis BO toward the outer peripheral side.
- the inner peripheral portion 103 of the inter-magnetic pole portion 100 c is not recessed, but the outer peripheral portion 101 is formed by the outer peripheral portion 103 of each magnetic pole portion 100 a and 100 b. It is concave with respect to the outer periphery 102. Also in this configuration, the magnetic flux in the concave magnetic pole portion 100c is reduced, and the magnetic flux accompanying the rotation of the rotor 40 can be changed smoothly, as in the first to third modified examples. Various effects can be obtained.
- the magnet according to the present invention is used for an axial gap type rotating electric machine mounted on a motorcycle, but the present invention is not limited to this.
- the present invention can be applied to an axial-gap rotating electric machine mounted on another device / equipment, and the above-described effects can be obtained.
- an axial gap type electric motor (electric motor) has been described as an axial gap type rotating electric machine on which the magnet according to the present invention is mounted, the present invention is not limited to this.
- the present invention can be applied to a so-called generator that generates an electromotive force in a coil by rotating the rotor from the outside.
- the magnet side is described as the rotor and the coil side is described as the stator, but the present invention is not limited to this. It is possible to configure the cut side as a stator and the coil side as a rotor, and it is possible to obtain substantially the same effects as in the above-described embodiments.
- the magnet according to the present invention is integrally formed by injection molding.
- the present invention has been described as a resin magnet, the present invention is not limited to this configuration.
- a sintered magnet or the like may be used.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03788130A EP1553678A4 (en) | 2002-08-16 | 2003-08-15 | MAGNET OF AN ELECTRIC DYNAMOMA MACHINE |
JP2004528889A JPWO2004017489A1 (ja) | 2002-08-16 | 2003-08-15 | 鞍乗型車両 |
AU2003266503A AU2003266503A1 (en) | 2002-08-16 | 2003-08-15 | Magnet of dynamo-electric machine |
US11/058,921 US7116027B2 (en) | 2002-08-16 | 2005-02-16 | Magnet for a dynamo-electric machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002237633 | 2002-08-16 | ||
JP2002-237633 | 2002-08-16 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/058,921 Continuation US7116027B2 (en) | 2002-08-16 | 2005-02-16 | Magnet for a dynamo-electric machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004017489A1 true WO2004017489A1 (ja) | 2004-02-26 |
Family
ID=31884442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010387 WO2004017489A1 (ja) | 2002-08-16 | 2003-08-15 | 回転電機のマグネット |
Country Status (7)
Country | Link |
---|---|
US (1) | US7116027B2 (ja) |
EP (1) | EP1553678A4 (ja) |
JP (1) | JPWO2004017489A1 (ja) |
CN (1) | CN1675813A (ja) |
AU (1) | AU2003266503A1 (ja) |
TW (1) | TWI256190B (ja) |
WO (1) | WO2004017489A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7116027B2 (en) | 2002-08-16 | 2006-10-03 | Yamaha Motor Co. Ltd | Magnet for a dynamo-electric machine |
JP2007068388A (ja) * | 2005-08-05 | 2007-03-15 | Yamaha Motor Co Ltd | 回転電機を搭載する鞍乗型車両 |
JP2009207338A (ja) * | 2008-02-29 | 2009-09-10 | Daikin Ind Ltd | アキシャルギャップ型回転電機及び界磁子用コア |
EP2709248A2 (en) | 2012-09-14 | 2014-03-19 | Yamaha Hatsudoki Kabushiki Kaisha | Axial gap type electric rotating machine, electric wheelchair and electric bicycle |
JPWO2021145136A1 (ja) * | 2020-01-14 | 2021-07-22 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI283103B (en) * | 2004-02-06 | 2007-06-21 | Yamaha Motor Co Ltd | Rotating electric machine and electrically driven vehicle |
JP2008043031A (ja) * | 2006-08-04 | 2008-02-21 | Mabuchi Motor Co Ltd | リング形状界磁マグネットに薄肉部を形成した小型モータ |
TWI385899B (zh) * | 2008-12-25 | 2013-02-11 | Metal Ind Res & Dev Ct | 永磁式電機之轉子結構及其製造方法 |
CN103138518A (zh) * | 2011-11-28 | 2013-06-05 | 台达电子工业股份有限公司 | 三相轴向磁通马达及其磁路调控方法 |
US20140175931A1 (en) * | 2012-12-21 | 2014-06-26 | Samsung Electro-Mechanics Co., Ltd. | Axial flux permanent magnet motor |
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JPS505923Y1 (ja) * | 1969-12-27 | 1975-02-20 | ||
JPS6430444A (en) * | 1987-07-23 | 1989-02-01 | Matsushita Electric Works Ltd | Rotor magnet |
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JPS59139842A (ja) * | 1983-01-31 | 1984-08-10 | Seiko Epson Corp | 回転電機用多極着磁磁石 |
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2003
- 2003-08-15 AU AU2003266503A patent/AU2003266503A1/en not_active Abandoned
- 2003-08-15 EP EP03788130A patent/EP1553678A4/en not_active Withdrawn
- 2003-08-15 CN CNA038191296A patent/CN1675813A/zh active Pending
- 2003-08-15 JP JP2004528889A patent/JPWO2004017489A1/ja active Pending
- 2003-08-15 TW TW092122536A patent/TWI256190B/zh not_active IP Right Cessation
- 2003-08-15 WO PCT/JP2003/010387 patent/WO2004017489A1/ja active Application Filing
-
2005
- 2005-02-16 US US11/058,921 patent/US7116027B2/en not_active Expired - Fee Related
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JPS505923Y1 (ja) * | 1969-12-27 | 1975-02-20 | ||
JPS6430444A (en) * | 1987-07-23 | 1989-02-01 | Matsushita Electric Works Ltd | Rotor magnet |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7116027B2 (en) | 2002-08-16 | 2006-10-03 | Yamaha Motor Co. Ltd | Magnet for a dynamo-electric machine |
JP2007068388A (ja) * | 2005-08-05 | 2007-03-15 | Yamaha Motor Co Ltd | 回転電機を搭載する鞍乗型車両 |
JP2009207338A (ja) * | 2008-02-29 | 2009-09-10 | Daikin Ind Ltd | アキシャルギャップ型回転電機及び界磁子用コア |
EP2709248A2 (en) | 2012-09-14 | 2014-03-19 | Yamaha Hatsudoki Kabushiki Kaisha | Axial gap type electric rotating machine, electric wheelchair and electric bicycle |
JPWO2021145136A1 (ja) * | 2020-01-14 | 2021-07-22 | ||
WO2021145136A1 (ja) * | 2020-01-14 | 2021-07-22 | ヤマハ発動機株式会社 | アキシャルギャップ型モータ |
EP4071973A4 (en) * | 2020-01-14 | 2023-01-18 | Yamaha Hatsudoki Kabushiki Kaisha | MOTOR WITH AXIAL GAP |
JP7300525B2 (ja) | 2020-01-14 | 2023-06-29 | ヤマハ発動機株式会社 | アキシャルギャップ型モータ |
Also Published As
Publication number | Publication date |
---|---|
AU2003266503A1 (en) | 2004-03-03 |
TWI256190B (en) | 2006-06-01 |
TW200404398A (en) | 2004-03-16 |
US20050174003A1 (en) | 2005-08-11 |
EP1553678A1 (en) | 2005-07-13 |
EP1553678A4 (en) | 2007-05-02 |
US7116027B2 (en) | 2006-10-03 |
CN1675813A (zh) | 2005-09-28 |
JPWO2004017489A1 (ja) | 2005-12-08 |
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