CN109980815A - The motor of inner-rotor type - Google Patents
The motor of inner-rotor type Download PDFInfo
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- CN109980815A CN109980815A CN201811478062.8A CN201811478062A CN109980815A CN 109980815 A CN109980815 A CN 109980815A CN 201811478062 A CN201811478062 A CN 201811478062A CN 109980815 A CN109980815 A CN 109980815A
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- motor
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- gum
- rotor
- magnet
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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
- H02K1/2706—Inner rotors
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- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
There is provided a kind of motor of inner-rotor type, wherein stator is annularly configured centered on central axis, and rotor configuration is in the radially inner side of stator.In the rotor, cylindrical portion is opposed with stator, and the ferro-gum of tubular is configured at the radially inner side of the inner peripheral surface of cylindrical portion and along the inner peripheral surface.
Description
Technical field
The present invention relates to the motors of inner-rotor type.
Background technique
The motor of inner-rotor type has stator and rotor.Rotor configuration is in the radially inner side of stator.Stator generates armature magnetic
?.Rotor generates excitation field.Generated excitation field interlinks with generated armature field.As a result, generate make rotor around
The torque of central axis rotation.
Rotor has rotor core and magnet.Magnet generates excitation field.
The motor of inner-rotor type is roughly divided into the motor of Surface Magnet (SPM) type and the motor of embedment magnet (IPM) type.?
In the motor of SPM type, magnet is kept by the outer peripheral surface of rotor core.The outer peripheral surface that magnet is held in rotor core is sometimes made
It is carried out with components such as magnet retainers, is sometimes carried out by being bonded.In the motor of IPM type, magnet is embedded in
Rotor core.
The magnet for being assembled in the rotor of the motor of SPM type is roughly divided into sintered magnet, plastic magnet and ferro-gum.
In the case where being assembled in the magnet of rotor is sintered magnet or plastic magnet, it is not easy to create the problem that
Magnet is made towards stator deformability or movement, thus magnet due to magnetic interaction between heat, external force, stator and magnet etc.
It is contacted with the tooth of stator etc..But in the case where being assembled in the magnet of rotor is sintered magnet or plastic magnet, magnet is not
Cheaply, the keeping, processing and the assembling to rotor of magnet are not easy to.
On the other hand, in the case where being assembled in the magnet of rotor is ferro-gum, it is easy to produce the above problem.Especially
It is that, in the case where ferro-gum is neodymium (Nd) ferro-gum, the above problem is easy to become obvious.But it is being assembled in rotor
Magnet be ferro-gum in the case where, magnet it is cheap, the keeping of magnet, processing and the assembling to rotor become to hold
Easily.
For example, motor documented by No. 4867671 bulletins of Japanese Patent Publication No. is the example of the motor of SPM type.In the bulletin
In documented motor, the magnet of tubular is fixed on the outer peripheral surface of rotor yoke assembly, to constitute rotor.In the public affairs
In motor documented by reporting, it is not clear that magnet is which kind of magnet in sintered magnet, plastic magnet and ferro-gum.
As described above, when the magnet assembled in the rotor for being set to the motor of SPM type is sintered magnet or plastic magnetic
In the case where iron, magnet is not cheap, and keeping, processing and the assembling to rotor of magnet are not easy.On the other hand, when being arranged
In the case that the magnet assembled in the rotor of the motor of SPM type is ferro-gum, under high temperature environment, be easy to produce magnet with
The problem of stator contact.
Therefore, in existing technology, it is difficult to obtain using cheap ferro-gum and does not allow to be also easy to produce magnet
With the motor of inner-rotor type the problem of stator contact.
Summary of the invention
In embodiment illustrated of the invention, it is capable of providing cheap and does not allow to be also easy to produce magnet and connect with stator
The motor of the inner-rotor type of the problem of touching.
In a mode of illustration of the invention, in the motor of inner-rotor type, stator is in centered on central axis
Arranged in a ring shape, rotor configuration is in the radially inner side of stator.In the rotor, cylindrical portion is opposed with stator, and the ferro-gum of tubular is matched
It is placed in the radially inner side of the inner peripheral surface of cylindrical portion and along the inner peripheral surface.
In said motor, the ferro-gum of tubular have towards radial outside the 1st multipole magnetized face and towards with
The 2nd multipole magnetized face in the different direction of radial outside.Said motor also has Magnetic Sensor.Magnetic Sensor and the 2nd multipole magnetic
Change face is opposed, the magnetic field that detection is generated by the 2nd multipole magnetized face.
In said motor, the 2nd multipole magnetized face is axially extending from cylindrical portion and towards axial direction.
In said motor, the ferro-gum of tubular is isotropic magnet.
In said motor, the ferro-gum of tubular has the multiple magnetized portions for being arranged as Halbach array.Rubber magnet
Iron has magnet inner peripheral surface and magnet outer peripheral surface.The magnetic generated by magnet inner peripheral surface is better than by the magnetic field that magnet outer peripheral surface generates
?.
In said motor, rotor also includes axis, along central axis；And engaging portion, by cylindrical portion and axis knot
Altogether.
In said motor, cylindrical portion has the 1st end.Engaging portion has the 2nd end.Engaging portion includes tubular
Engaging portion, in conjunction with axis；And plate-like portion, in conjunction with the 1st end and the 2nd end.
In said motor, the outer diameter of stator is greater than the axial dimension of stator.
In said motor, cylindrical portion is made of non-magnetic material
Motor according to one method of the present invention assembles and cheap by easy keeping, processing and to rotor
Ferro-gum be assembled in rotor.Thereby, it is possible to provide the motor of cheap inner-rotor type.
Embodiment illustrated according to the present invention, in the radial outside of ferro-gum, there are cylindrical portions.
Limited using cylindrical portion as a result, due to magnetic interaction between heat, external force, stator and ferro-gum etc. and
Cause ferro-gum towards stator deformability or movement, so as to prevent ferro-gum and stator contact.
The present invention can be more clearly understood that referring to attached drawing by the detailed description of the preferred embodiment for the present invention below
Above-mentioned and other feature, element, step, features and advantages.
Detailed description of the invention
Fig. 1 is the cross-sectional view schematically illustrated to the motor of the 1st embodiment.
Fig. 2 is schematically to carry out figure to the rotor, Magnetic Sensor and the substrate that are arranged in the motor of the 1st embodiment
The cross-sectional view shown.
Fig. 3 is the cross-sectional view schematically illustrated to the ferro-gum being arranged in the motor of the 1st embodiment.
Fig. 4 is the cross-sectional view schematically illustrated to the motor of the 2nd embodiment.
Fig. 5 is schematically to carry out figure to the rotor, Magnetic Sensor and the substrate that are arranged in the motor of the 2nd embodiment
The cross-sectional view shown.
Specific embodiment
It is illustrated hereinafter, Duiing embodiment illustrated of the invention while referring to attached drawing.In addition, in the application
In, the direction parallel with the central axis C of motor is known as " axial direction ", the direction of the central axis upright with motor is known as
" radial direction " will be known as " circumferential direction " along the direction of the circular arc centered on the central axis C of motor.In addition, in this application, it will
It is axial that the shape and positional relationship of each section are illustrated as up and down direction.But, it is not intended to pass through the upper and lower
To definition manufacture and use to limit motor of the invention when direction.
In the present specification, " parallel direction " also includes substantially parallel direction.In the present specification, " vertical side
To " it also include generally perpendicular direction.
1 the 1st embodiment
The outline of 1.1 motors
Fig. 1 is the cross-sectional view schematically illustrated to the motor of the 1st embodiment.
The motor 1000 illustrated in Fig. 1 is inner-rotor type motor, has stator 1020, rotor 1021, shell 1022, bearing
1023 and bearing 1024.Motor 1000 also can have the works other than these works.
Shell 1022 is the component of the tubular axially extended.The material of shell 1022 is not particularly limited, preferably for
Such as aluminium (including aluminium alloy) or SUS ferroalloy etc..Shell 1022 is accommodated with stator 1020 and rotor 1021 etc. in inside.Stator
1020 are combined without bearing 1023 and 1024 with shell 1022.Stator 1020 is as a result, with the shape fixed relative to shell 1022
State is kept by shell 1022.Stator 1020 is such as by being fixed on shell 1022 indentation or shrunk fit.
Bottom on the downside of the axial direction of shell 1022 is formed with towards the recess portion being recessed on the downside of axial direction.It is kept in the recess portion
There is bearing 1024.Cover is configured at the axis opening portion to the upper side of shell 1022.In the present embodiment, cover is substantially
The component of plate.Cover is with shell 1022 such as by being fixed up Screw (illustration omitted).Cover its substantially in
At centre have along axially through through hole.Bearing 1023 is maintained in the through hole.In the present embodiment, bearing 1023
Size be greater than bearing 1024 size.But the size of bearing 1023 can also be identical as the size of bearing 1024, it can also be with
It is that size relation is opposite.
Rotor 1021 can be rotated by the bearing of bearing 1023 and 1024 relative to shell 1022.In the present embodiment,
Bearing 1023 and 1024 is, for example, ball bearing.But the type of bearing 1023 and 1024 is not particularly limited, and is also possible to slide
The other kinds of bearing such as bearing.
In motor driving, stator 1020 becomes armature and generates armature field.Rotor 1021 becomes excitation and generates and encourage
Magnetic magnetic field.Generated excitation field interlinks with generated armature field.Producing as a result, makes rotor 1021 around central axis
The torque of C rotation.
Motor 1000 is inner-rotor type.Therefore, in motor 1000, the diameter that rotor 1021 is configured at stator 1020 is inside
Side.Stator 1020 is annular in shape, is annularly configured centered on central axis C.
1.2 stator
Like that, stator 1020 has stator core 1040 and multiple windings 1041 to diagram as shown in figure 1.Stator core 1040 has
Cored back 1060 and multiple teeth 1061.
In the present embodiment, core-back 1060 is annular in shape, is annularly configured centered on central axis C.Each tooth
1061 is prominent from the inner peripheral surface 1080 of core-back 1060 towards radially inner side.Multiple teeth 1061 edge centered on central axis C
Circumferentially spaced interval and configure.In the present embodiment, tooth 1061 circumferentially, equally spaced configures.It is equipped on each tooth 1061
Insulating part.The material of insulating part is the insulating materials such as the resin of insulating properties.On each tooth 1061 across insulating part be equipped with around
Group 1041.Winding 1041 is, for example, to be made up of coiled electrical conductor.
Stator core 1040 is made of magnetic substance.In the present embodiment, stator core 1040 is by muti-piece electromagnetic steel plate
The stacked steel plate made of axially stacked.When to multiple 1041 galvanizations of winding, armature field corresponding with electric current is generated.Separately
Outside, stator core 1040 is also possible to compressed-core etc. to replace stacked steel plate.
Stator 1020 with the illustrated construction of Fig. 1 can also be replaced into and be determined with the construction different from the construction
Son.Above-mentioned stator core 1040 is the not divided cricoid circular iron core of core-back.But stator core 1040 is unlimited
In circular iron core, any iron core being also possible in the vertical bar iron core that segmentation iron core is connected with a part of only core-back,
It can be the iron core of other shapes.The winding method of multiple windings 1041 can be any side concentrated in winding and scatter winds
Method is also possible to other winding method.
1.3 rotor
Fig. 2 is schematically to illustrate to the rotor, Magnetic Sensor and the substrate that are arranged in the motor of the 1st embodiment
Cross-sectional view.Fig. 2 is the figure for being exaggerated a part of Fig. 1.
As in Fig. 1 and Fig. 2 illustrate like that, rotor 1021 with axis 1100, rotor core 1101, have lid cylindrical body 1102 with
And ferro-gum 1103.
Like that, axis 1100 is combined diagram with the inner ring 1140 of the inner ring 1120 of bearing 1023 and bearing 1024 as shown in figure 1.It is interior
Circle 1120 and 1140 can be respectively relative to the outer ring 1121 of bearing 1023 and the outer ring 1141 of bearing 1024 and rotate.Outer ring
1121, it 1141 is combined with shell 1022.Axis 1100 can revolve in the state of along central axis C around central axis C as a result,
Turn.
In the present embodiment, the stacked steel plate made of axially stacked that is muti-piece electromagnetic steel plate of rotor core 1101.Such as
It is illustrated in Fig. 2 like that, axis 1100 passes through the hole 1160 formed in rotor core 1101.Hole 1160 is along axially through rotor core
1101.Rotor core 1101, which is combined and is incorporated in the axis 1100 being inserted into, space in the cylinder formed in lid cylindrical body 1102
In 1170.In the present embodiment, lid cylindrical body 1102 is combined with the rotor core 1101 stored.Ferro-gum 1103 is received
It is contained in cylinder in space 1170, and has been installed on lid cylindrical body 1102.Ferro-gum 1103 can be with 1100 one of axis as a result,
Ground rotation.
In addition, axis 1100 can also be combined with rotor core 1101 indirectly via the component of resin or metal etc..That is,
Axis 1100 is directly or indirectly fixed on rotor core 1101.In the present embodiment, rotor core 1101 is also possible to press
Powder magnetic core etc. replaces stacked steel plate.
In the present embodiment, ferro-gum 1103 is cylindrical in shape, and configuration is cylindrical in shape centered on central axis C.Rubber magnet
The magnet outer peripheral surface 1180 of iron 1103 is magnetized out multipole and becomes multipole magnetized face.The generation of magnet outer peripheral surface 1180 as a result, is encouraged
Magnetic magnetic field.
The advantages of 1.4 ferro-gum
The illustrated tubular of Fig. 1 and Fig. 2 can be readily available and flat ferro-gum is deformed into tubular
Ferro-gum 1103.In addition, not needing particular manufacturing craft when flat ferro-gum is deformed into tubular.Moreover, plate
The ferro-gum of shape does not need the wide space etc. for keeping for example, can easily be done keeping.Therefore, it is being assembled in
In the case that the magnet of rotor 1021 is ferro-gum 1103, keeping, processing and the assembling to rotor 1021 of magnet are held very much
Easily.In addition, in ferro-gum 1103, binding material that magnetic powder is bonded to one another it is cheap.Therefore, it is being assembled in
In the case that the magnet of rotor 1021 is ferro-gum 1103, the manufacturing cost etc. of magnet becomes cheap.Therefore, be assembled in turn
In the case that the magnet of son 1021 is ferro-gum 1103, it is capable of providing cheap motor 1000.
In motor driving, the electromagnetic force of radial direction is generated between tooth and magnet.Be likely due to the electromagnetic force and
Tooth and magnet is set to generate vibration, to generate noise from motor.
Especially, in the case where being assembled in the magnet of rotor 1021 is plastic magnet or sintered magnet, the noise is not
It is easy to be suppressed.
In addition, in the case where being assembled in the magnet of rotor 1021 is plastic magnet or sintered magnet, it is also possible to generate
Following problem: resonance noise changes according to the amount for the bonding agent that magnet is adhered to rotor subject.
In contrast, the ferro-gum 1103 in present embodiment has elasticity.As a result, motor drive when, due to
The electromagnetic force of the radial direction generated between each tooth 1061 and ferro-gum 1103 and the vibration generated is declined by ferro-gum 1103
Subtract, it is suppressed that the noise generated from motor 1000.
1.5 prevent ferro-gum and stator contact
In the case where being assembled in the magnet of the illustrated rotor 1021 of Fig. 1 and Fig. 2 is ferro-gum 1103, it is possible to by
Magnetic interaction between heat, external force, stator 1020 and ferro-gum 1103 etc. and cause ferro-gum 1103 to stator
1020 deformations are mobile.Therefore, it is desirable to these deformations or mobile be limited, to prevent ferro-gum 1103 and stator 1020
Contact.Hereinafter, the structure to the use is illustrated.
In the case that even if rotor 1021 rotates in motor driving, rotor core 1101 and there is not lid cylindrical body 1102 also not
The degree contacted with stator 1020 can be deformed to.
As diagram in Fig. 2, there is lid cylindrical body 1102 that there is cylindrical portion 1200.In the present embodiment, constituting has lid
The cylindrical portion 1200 of cylindrical body 1102 is non-magnetic material.In the case where the material of cylindrical portion 1200 is non-magnetic material, cylinder
The material in shape portion 1200 is, for example, aluminium (comprising aluminium alloy) etc., but is not particularly limited.
Cylindrical portion 1200 is cylindrical in shape configuration centered on central axis C, opposed radially with stator 1020.
Ferro-gum 1103 is mounted on the inner peripheral surface 1220 of cylindrical portion 1200.Therefore, ferro-gum 1103 is by inner peripheral surface
1220 keep and are configured at the radially inner side of inner peripheral surface 1220.Ferro-gum 1103 is along inner peripheral surface 1220.
Cylindrical portion 1200 is configured in the radial outside of ferro-gum 1103.Therefore, it is limited using cylindrical portion 1200
Ferro-gum 1103 is deformed to stator 1020 or movement.As a result, can prevent ferro-gum 1103 from connecing with stator 1020
Touching.Especially, limited using cylindrical portion 1200 in the case where 1021 high speed rotation of rotor ferro-gum 1103 due to from
Mental and physical efforts and to stator 1020 deform and disperse.
The combination of 1.6 cylindrical portions and axis
As diagram in Fig. 2, there is lid cylindrical body 1102 that also there is plate-like portion 1201.
Plate-like portion 1201 is the position for covering the cover shape of a part of the opening of upside of cylindrical portion 1200.Therefore, tubular
From the plate end 1260 of the peripheral side of plate-like portion 1201, downside extends in the axial direction in portion 1200.In the present embodiment, plate-like portion
1201 in disk-shaped.Plate-like portion 1201 is integrally formed with cylindrical portion 1200.Plate-like portion 1201 and cylindrical portion 1200 for example can
It is formed by punch process, machining, casting etc..In addition, the shape of plate-like portion 1201 is not limited to above-mentioned shape, do not have
It is particularly limited to.
Rotor core 1101 is combined with axis 1100.Rotor core 1101 is such as by being fixed on axis 1100 indentation.?
In present embodiment, plate-like portion 1201 is combined with rotor core 1101.In this case, plate-like portion 1201 can for example pass through chisel
Tightly, be bonded, weld etc. and be fixed on rotor core 1101.The cylinder end 1240 of the upside of cylindrical portion 1200 and plate-like portion 1201
The plate end 1260 of peripheral side combines.Rotor core 1101 and plate-like portion 1201 are by cylindrical portion 1200 and 1100 knot of axis as a result,
Engaging portion 1280 altogether, cylindrical portion 1200 can integrally be rotated with axis 1100.As long as in addition, plate-like portion 1201 and axis
1100 combine, then plate-like portion 1201 may not necessarily also be fixed on rotor core 1101.In this case, plate-like portion 1201 can also be with
It is contacted in the axial direction with rotor core 1101 or opposed across gap.In addition, by rotor core 1101 and plate-like portion 1201
The engaging portion 1280 of composition can also be replaced into the engaging portion with other constructions.The example can saying in the 2nd embodiment
It is mentioned in bright.
The detection of the circumferential position of 1.7 rotors
The ferro-gum 1103 of tubular has different from radial outside towards the 1st multipole magnetized face of radial outside and direction
Direction the 2nd multipole magnetized face.More specifically, the magnet outer peripheral surface 1180 of the ferro-gum 1103 illustrated in Fig. 2 is court
To radial outside and generate the 1st multipole magnetized face of excitation field.
Moreover, the end face 1300 of the downside of ferro-gum 1103 is directed towards axial downside and generates in motor 1000
For detecting the 2nd multipole magnetized face in the magnetic field of the circumferential position of rotor 1021.
Motor 1000 has substrate 1321 and at least one Magnetic Sensor 1320.In the present embodiment, substrate 1321
The component of plate in this way.Capacitor is electrically connected on the face of at least one party in the axial side and the axial other side of substrate 1321
The various electronic components such as device.Although illustration omitted, substrate 1321 is such as the bearing by shell 1002 and stator, holding.Substrate
1321 connect via connector etc. with external power supply (illustration omitted).In addition, substrate 1321 is such as directly or via conducting wire
Conductive component and connect indirectly with winding.Thereby, it is possible to provide electric power to motor (that is, stator) via external power supply.In addition,
Substrate 1321 is not limited to so-called printed base plate (PCB), is also possible to FPC (Flexible printed circuits: flexible
Printed circuit) etc..In addition, the number of substrate 1321 is not limited to one, it is also possible to two or more.Substrate 1321 can be single side
The single substrate of electronic component etc. is installed, the two-sided double-sided substrate for being equipped with electronic component etc. is also possible to.
Magnetic Sensor 1320 is the position sensor for detecting the circumferential position of rotor 1021.In the present embodiment, magnetic passes
Sensor 1320 is installed on substrate 1321.End of the Magnetic Sensor 1320 in circumferential specific position and the downside of ferro-gum 1103
Face 1300 is opposed.
Magnetic Sensor 1320 is able to detect the magnetic field generated by end face 1300, and the magnetic field for exporting and detecting as a result,
Corresponding electric signal.The circumferential position of rotor 1021 can be for example detected or inferred according to the electric signal exported.That is, horse
Also there is Magnetic Sensor that is opposed with the 2nd multipole magnetized face and detecting the magnetic field generated by the 2nd multipole magnetized face up to 1000.
Magnetic Sensor 1320 can be any element in Hall element and magnetoresistive element, be also possible to other elements.
Magnetic Sensor 1320 also can detecte in the magnet by ferro-gum 1103 other than detecting the magnetic field generated by end face 1300
The magnetic field of the generations such as circumferential surface 1181.The quantity of Magnetic Sensor 1320 can be one, be also possible to three or more, can according to turn
The quantity of the magnetic pole of son or the quantity etc. of phase and suitably change.
In the case where magnet, which is, has stronger anisotropic sintered magnet, preferably setting and generation excitation field
The independent sensor-magnet of sintered magnet and the Magnetic Sensor in magnetic field that is generated by sensor-magnet of detection.Therefore, it senses
The cost and installation work-hour of device magnet etc. increase.
In contrast, in the present embodiment, preferably, ferro-gum 1103 is isotropic magnet or anisotropy
Magnet.Anisotropic magnet has also can be magnetized weaker each on the direction different from the direction that easy magnetizing axis is extended
Anisotropy.More preferably, ferro-gum 1103 is isotropic magnet.
It is isotropic magnet or feelings with weaker anisotropic anisotropic magnet in ferro-gum 1103
It, will be towards the magnet outer peripheral surface 1180 of the ferro-gum 1103 of radial outside and towards the axial direction different from radial outside under condition
1300 both sides of the end face magnetization of the downside of the ferro-gum 1103 of downside is easy to.
As a result, without being arranged and the independent sensor magnetic of ferro-gum 1103 to detect the circumferential position of rotor 1021
The Magnetic Sensor in the magnetic field that iron and detection are generated by sensor-magnet.As a result, can reduce the manufacture of motor 1000 at
This.
As diagram in Fig. 2, from cylindrical portion 1200, downside is stretched in the axial direction for the end face 1300 of the downside of ferro-gum 1103
Out.That is, the 2nd multipole magnetized face is axially extending from cylindrical portion 1200 and towards axial direction.Magnetic Sensor 1320 is configured as a result,
It is easy near end face 1300, can efficiently detect the magnetic field generated by end face 1300 using Magnetic Sensor 1320.
Alternatively, it is also possible to as so following.Under the plate end 1260 of the peripheral side of plate-like portion 1201 and cylindrical portion 1200
The cylinder end 1241 of side combines.The end face 1301 of the upside of ferro-gum 1103 is towards axial upside.End face 1301 is from cylindrical portion
1200 upside stretchings in the axial direction.Magnetic Sensor 1320 is opposed with end face 1301.End face 1301 is generated for detecting rotor as a result,
The multipole magnetized face in the magnetic field of 1021 circumferential position.In other words, Magnetic Sensor 1320 is able to detect from the generation of end face 1301
Magnetic flux.
The installation of 1.8 ferro-gums
The ferro-gum 1103 illustrated in Fig. 2 is mounted on the inner peripheral surface of cylindrical portion 1200 by arbitrary installation method
On 1220.For example, ferro-gum 1103 is by being tightly pressed into cylindrical portion 1200 and being pasted on inner peripheral surface 1220 by it
And it is installed on inner peripheral surface 1220.It, can be by than pacifying in the motor of SPM type or IPM type according to such installation method
Installation procedure simple installation procedure in the case where dress sintered magnet installs ferro-gum 1103.In addition, ferro-gum
1103 can also be installed on the inner peripheral surface 1220 of cylindrical portion 1200 by other methods such as bonding.
1.9 the type of magnet
The illustrated ferro-gum 1103 of Fig. 1 and Fig. 2 can be the iron oxygen by constituting comprising the composition including ferrite
Any ferro-gum in body rubber magnet and the Nd ferro-gum by constituting comprising the composition including neodymium (Nd), is also possible to
Other ferro-gums, but preferably Nd ferro-gum.
Nd ferro-gum has the magnetic force same with higher volume of ferrite rubber magnet is accounted for.Therefore, same when to generate
Deng magnetic force when, the case where compared to ferrite rubber magnet is used, in the case where ferro-gum 1103 is Nd ferro-gum,
The volume of magnet can be reduced to reduce the volume of rotor.As a result, motor 1000 can be made to minimize.
The price of Nd ferro-gum, which is lower than, includes the Nd plastic magnet and Nd sintered magnet including Nd.Therefore, it is being assembled in
In the case that the magnet of rotor 1021 is Nd ferro-gum, it is capable of providing cheap motor 1000.The valence of Nd plastic magnet
It is because being needed in the case where Nd plastic magnet using epoxides, polyamide (PA), polyphenylene sulfide that lattice, which are higher than Nd ferro-gum,
Ether (PPS) etc. is used as adhesive.It is the Nd content because in Nd sintered magnet that the price of Nd sintered magnet, which is higher than Nd ferro-gum,
Higher than the Nd content in Nd ferro-gum.
In common Nd ferro-gum, the magnetic powder being made of the magnetic material of NeFeB system by nitrile rubber each other
It is bonded together.But nitrile rubber is inadequate for magnetic force possessed by the magnetic powder to the power that the magnetic powder is fixed
Sufficiently.Therefore, in the feelings that common Nd ferro-gum is merely assembled into the rotor being arranged in the motor of existing SPM type
Under condition, it is possible to produce the problem because caused by the power is insufficient.
For example, in the inner-rotor type with stator and the rotor for the Nd ferro-gum for being assembled with ten magnetic poles that are magnetized out
Motor be assembled and in the case where placing, it is possible to produce following problem: the magnetic powder is pulled to stator core to Nd
Ferro-gum contacts at ten with stator core.
But in motor 1000, ferro-gum 1103 is installed on to the inner peripheral surface 1220 of cylindrical portion 1200, so as to
Prevent the problem from generating.
1.10 Halbach array
Fig. 3 is the cross-sectional view schematically illustrated to the ferro-gum being arranged in the motor of the 1st embodiment.
The illustrated ferro-gum 1103 of Fig. 3 is magnetized out eight magnetic poles.In addition, the number of magnetic poles in ferro-gum 1103
It can be the number of magnetic poles except eight magnetic poles.
Ferro-gum 1103 is preferably isotropic magnet.In the present embodiment, ferro-gum 1103 is geomagnetic into sea
That Bake array.As diagram in Fig. 3, ferro-gum 1103 has multiple magnetized portions 1400 of Halbach array.Rubber
Magnet 1103 has magnet inner peripheral surface 1181 and magnet outer peripheral surface 1180.
Flux concentrating is in the magnet outer peripheral surface 1180 of ferro-gum 1103 as a result, by the magnet periphery of ferro-gum 1103
The magnetic field that face 1180 generates is better than the magnetic field generated by the magnet inner peripheral surface 1181 of ferro-gum 1103.By magnet outer peripheral surface 1180
The magnetic field of generation becomes by force because of the magnetization of Halbach array, this facilitate maintain the volume of ferro-gum 1103, shape with
And material it is constant in the case where increase motor 1000 caused by torque.
The magnetic field generated by magnet inner peripheral surface 1181 is weakened because of the magnetization of Halbach array, this not need from
Tooth 1061 reaches the magnetic circuit of stator 1020 via rotor core, without setting in the radially inner side of magnet inner peripheral surface 1181
Set the rotor core functioned as yoke.Therefore, above-mentioned 1101 non-magnetic material of rotor core can be made.
As described above, in the case that rotor core is set not in rotor 1021, the assembling procedure quilt of rotor 1021
Simplify.In addition, the inertia of rotor 1021 becomes smaller, 1000 phase of motor in the case where rotor core ought not be arranged in rotor 1021
The responsiveness of the instruction of control is improved.
Multiple magnetized portions 1400 circumferentially arrange.Multiple magnetized portions 1400 include the diametrical magnetization portion radially magnetized out
1420 and circumferentially magnetize circumferential magnetization portion 1421 out.In multiple magnetized portions 1400, diametrical magnetization portion 1420 and circumferential magnetic
Change portion 1421 arranges circumferentially alternatingly.
Multiple diametrical magnetization portions 1420 include the 1st diametrical magnetization portion 1440 and the 2nd diametrical magnetization portion 1441.It is radial the 1st
In magnetized portion 1440, the pole S is exposed on the magnet outer peripheral surface 1180 of ferro-gum 1103.In the 2nd diametrical magnetization portion 1441, N
Expose on the magnet outer peripheral surface 1180 of ferro-gum 1103 pole.
In multiple diametrical magnetization portions 1420, the 1st diametrical magnetization portion 1440 and the 2nd diametrical magnetization portion 1441 are alternately arranged
Column.In the two circumferential magnetization portions 1421 adjacent with the 1st diametrical magnetization portion 1440, the direction from the pole S towards the pole N is separate is somebody's turn to do
The direction in the 1st diametrical magnetization portion 1440.In the two circumferential magnetization portions 1421 adjacent with the 2nd diametrical magnetization portion 1441, from the pole S
Direction towards the pole N is the direction close to the 2nd diametrical magnetization portion 1441.
As described above, ferro-gum 1103 is cylindrical in shape configuration centered on central axis C.But ferro-gum 1103
The multiple ferro-gums circumferentially arranged centered on central axis C can be replaced into.Multiple ferro-gums respectively with rubber magnet
Multiple magnetized portions 1400 possessed by iron 1103 are similarly magnetized.
The shape and purposes of 1.11 motors
In the case where being assembled in the magnet of rotor 1021 is ferro-gum 1103, it is capable of increasing caused by motor 1000
Axial dimension of the torque without will increase stator 1020.
Therefore, it in the case where being assembled in the magnet of rotor 1021 is ferro-gum 1103, has been readily available as follows
Motor 1000: small-sized, the outer diameter with stator 1020Greater than the flat shape of the axial dimension of stator 1020, generate higher
Torque.The outer diameter of achievable stator 1020For example, 85mm or so, it can be achieved that stator 1020 axial dimension for example
In the range of 3mm to 7mm.
The motor 1000 of such size is for example preferably used as being equipped on the power sliding motor of automobile.
2 the 2nd embodiments
Fig. 4 is the cross-sectional view schematically illustrated to the motor of the 2nd embodiment.
The motor 2000 illustrated in Fig. 4 is inner-rotor type motor, has stator 1020, rotor 2021, shell 1022, bearing
1023, bearing 1024, Magnetic Sensor 1320 and substrate 1321.
Stator 1020, shell 1022, bearing 1023, bearing 1024, Magnetic Sensor 1320 and substrate 1321 are respectively with the 1st
The stator 1020 that is arranged in the motor 1000 of embodiment, shell 1022, bearing 1023, bearing 1024, Magnetic Sensor 1320 with
And substrate 1321 is identical, therefore, omits their explanation.
Rotor 2021 has axis 2100, has the dual cylindrical body 2102 of lid and ferro-gum 1103.
The ferro-gum 1103 being arranged in ferro-gum 1103 and the motor 1000 of the 1st embodiment is identical.
Fig. 5 is schematically to carry out figure to the rotor, Magnetic Sensor and the substrate that are arranged in the motor of the 2nd embodiment
The cross-sectional view shown.Fig. 5 is the figure for being exaggerated a part of Fig. 4.
As diagram in Fig. 5, there is the dual cylindrical body 2102 of lid that there is cylindrical portion 2200, plate-like portion 2201 and tubular knot
Conjunction portion 2202.Cylindrical portion 2200 has the 1st end 2240.Engaging portion 2280 includes tubular engaging portion 2202, with axis 2100
In conjunction with and with the 2nd end 2600；And plate-like portion 2201, with the 1st end 2240 and the 2nd 2600 knot of end
It closes.Hereinafter, being illustrated to details.
Plate-like portion 2201 is the position for covering at least part of cover shape of the opening of upside of cylindrical portion 2200.Cylindrical portion
2200 from the plate end 2260 of the peripheral side of plate-like portion 2201, downside extends in the axial direction.Tubular engaging portion 2202 is from positioned at plate-like portion
Downside extends in the axial direction for the plate end 2261 of the inner circumferential side of 2201 substantial middle.
Tubular engaging portion 2202 is for example formed by flange processing, and configuration is cylindrical in shape centered on central axis C.At this
In embodiment, tubular engaging portion 2202 is combined via the annular knurl slot 2500 being engraved on axis 2100 with axis 2100.Plate-like portion
The plate end 2261 of 2201 inner circumferential side is combined with the 2nd end 2600 of the upside of tubular engaging portion 2202.Cylindrical portion 2200
The cylinder end 2240 of upside combined with the plate end 2260 of the peripheral side of plate-like portion 2201.Ferro-gum 1103 is mounted on tubular
On the inner peripheral surface 2220 in portion 2200, it is configured at the radially inner side of inner peripheral surface 2220, along inner peripheral surface 2220.In present embodiment
In, tubular engaging portion 2202, the 2nd end 2600 and plate-like portion 2260 are, for example, to pass through punch process or machining etc.
It is integrally formed.In addition, tubular engaging portion 2202, the 2nd end 2600 and plate-like portion 2260 for example may not be it is logical
Cross punch process etc. and be made of a component, can also be assembled with one another by seperated component and constitute a component.
Plate-like portion 2201 and tubular engaging portion 2202 are the cylindrical portion 2200 and axis 2100 that will be equipped with ferro-gum 1103
The engaging portion 2280 combined.In the present embodiment and, tubular engaging portion 2202, the 2nd end 2600 and plate
The material in portion 2260 is non-magnetic material.Rotor core is not needed in rotor 2021 as a result, thus the assembling of rotor 2021
Process is simplified.In addition, the inertia of rotor 2021 becomes smaller in the case where rotor core ought not being arranged in the rotor, motor 2000
The responsiveness of instruction relative to control improves.
Even if being also capable of providing cheap motor in the case where engaging portion 1280 is replaced into engaging portion 2280
2000, prevent ferro-gum 1103 from contacting due to deformation etc. with stator 1020.
The present invention is used not only for power sliding, also can be widely applied for dust catcher, drying machine, ceiling fan, washing machine, ice
Case and electric power steering apparatus etc. have the plurality of devices of various motors.
It describes the invention in detail, but above-mentioned explanation is the illustration of various aspects, the invention is not limited thereto.It should
It is interpreted as, can be envisaged that the infinite variety example not illustrated without departing from the scope of the present invention.
Claims (9)
1. a kind of motor of inner-rotor type, includes
Stator is annularly configured centered on central axis；And
Rotor is configured at the radially inner side of the stator,
The motor is characterized in that,
The rotor includes
Cylindrical portion, it is opposed with the stator, there is inner peripheral surface；And
The ferro-gum of tubular is configured at the radially inner side of the inner peripheral surface and along the inner peripheral surface.
2. the motor of inner-rotor type according to claim 1, which is characterized in that
The ferro-gum of the tubular has different from radial outside towards the 1st multipole magnetized face of radial outside and direction
The 2nd multipole magnetized face in direction,
The motor of the inner-rotor type also has Magnetic Sensor, and the Magnetic Sensor is opposed with the 2nd multipole magnetized face, detection by
The magnetic field that the 2nd multipole magnetized face generates.
3. the motor of inner-rotor type according to claim 2, which is characterized in that
The 2nd multipole magnetized face is axially extending from the cylindrical portion and towards axial direction.
4. the motor of inner-rotor type according to claim 2 or 3, which is characterized in that
The ferro-gum of the tubular is isotropic magnet.
5. according to claim 1 to the motor of inner-rotor type described in any one in 3, which is characterized in that
The ferro-gum of the tubular with the multiple magnetized portions for being arranged as Halbach array and have magnet inner peripheral surface and
Magnet outer peripheral surface,
The magnetic field generated by the magnet inner peripheral surface is better than by the magnetic field that the magnet outer peripheral surface generates.
6. according to claim 1 to the motor of inner-rotor type described in any one in 3, which is characterized in that
The rotor also includes
Axis, along the central axis；And
Engaging portion combines the cylindrical portion with the axis.
7. the motor of inner-rotor type according to claim 6, which is characterized in that
The cylindrical portion has the 1st end,
The engaging portion includes
Tubular engaging portion has the 2nd end in conjunction with the axis；And
Plate-like portion, in conjunction with the 1st end and the 2nd end.
8. according to claim 1 to the motor of inner-rotor type described in any one in 3, which is characterized in that
The outer diameter of the stator is greater than the axial dimension of the stator.
9. according to claim 1 to the motor of inner-rotor type described in any one in 3, which is characterized in that
The cylindrical portion is made of non-magnetic material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017234107A JP2019103321A (en) | 2017-12-06 | 2017-12-06 | Inner rotor type motor |
| JP2017-234107 | 2017-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109980815A true CN109980815A (en) | 2019-07-05 |
Family
ID=66977283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811478062.8A Withdrawn CN109980815A (en) | 2017-12-06 | 2018-12-05 | The motor of inner-rotor type |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2019103321A (en) |
| CN (1) | CN109980815A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688451A (en) * | 2019-10-17 | 2021-04-20 | 丰田自动车株式会社 | Rotor and method for manufacturing rotor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10256031A (en) * | 1997-01-10 | 1998-09-25 | Mitsubishi Materials Corp | Magnet, manufacture thereof and small-sized motor using the magnet |
| CN1767331A (en) * | 2004-10-04 | 2006-05-03 | 日本电产株式会社 | Brushless motor |
-
2017
- 2017-12-06 JP JP2017234107A patent/JP2019103321A/en active Pending
-
2018
- 2018-12-05 CN CN201811478062.8A patent/CN109980815A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10256031A (en) * | 1997-01-10 | 1998-09-25 | Mitsubishi Materials Corp | Magnet, manufacture thereof and small-sized motor using the magnet |
| CN1767331A (en) * | 2004-10-04 | 2006-05-03 | 日本电产株式会社 | Brushless motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688451A (en) * | 2019-10-17 | 2021-04-20 | 丰田自动车株式会社 | Rotor and method for manufacturing rotor |
| CN112688451B (en) * | 2019-10-17 | 2024-04-30 | 丰田自动车株式会社 | Rotor and method for manufacturing rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019103321A (en) | 2019-06-24 |
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Application publication date: 20190705 |
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