CN110462983A - Rotor, motor and electric power steering apparatus - Google Patents
Rotor, motor and electric power steering apparatus Download PDFInfo
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- CN110462983A CN110462983A CN201880022442.2A CN201880022442A CN110462983A CN 110462983 A CN110462983 A CN 110462983A CN 201880022442 A CN201880022442 A CN 201880022442A CN 110462983 A CN110462983 A CN 110462983A
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Abstract
Rotor includes the axis rotated centered on the central axis vertically extended；It is fixed on the rotor core of axis；It is set to axial a part of rotor core, and multiple 1st magnet configured in the circumferential across interval；And multiple 2nd magnet for being set at the positions different from the 1st magnet in the axial direction of rotor core, and being configured in the circumferential across interval, the magnetic flux density of the 1st magnet and the 2nd magnet is identical, and shape is mutually different.
Description
Technical field
The present invention relates to rotor, motor and electric power steering apparatus.
Background technique
The rotor of motor has the rotor core rotated together with axis and is provided in the circumferential direction of rotor core multiple
Magnet.The cogging torque that such motor generates at work is related to the vibration of motor and the increase of noise.Therefore, it is intended that
Inhibit the generation of cogging torque in motor.
For example, Patent Document 1 discloses be divided into rotor core in the axial direction multiple and make these multiple rotors
Structure of the magnet of iron core relative to axially inclined (deflection).Moreover, disclosing in the patent document 1 such as flowering structure: by magnetic
Iron is arranged to multistage in the axial direction of rotor core, makes magnetic flux between the magnet an of section and the magnet of other sections, circumferential
Width dimensions, axial length dimension, the thickness of radial direction, area are mutually different.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2014-121265 bulletin
Summary of the invention
Subject to be solved by the invention
But in such as above-mentioned motor, there are problems that spending the time when assemble rotor and productivity being caused to decline.
In view of the foregoing, one of its goals is to provide turn for inhibiting cogging torque and capable of simplifying assembling by the present invention
Son, motor and electric power steering apparatus.
Means for solving the problems
One mode of rotor of the invention includes axis, and the axis is centered on the central axis vertically extended
Rotation；Rotor core, the rotor core are fixed on the axis；Multiple 1st magnet, the multiple 1st magnet are set to described
Axial a part of rotor core, the multiple 1st magnet are configured across interval in the circumferential；And multiple 2nd magnet,
The multiple 2nd magnet is set at the positions different from the 1st magnet in the axial direction of the rotor core, the multiple
2nd magnet is configured across interval in the circumferential, and the 1st magnet is identical with the magnetic flux density of the 2nd magnet, and shape is mutual
It is different.
One mode of motor of the invention includes above-mentioned rotor；And radially across gap and with the rotor
Opposite stator.
One mode of electric power steering apparatus of the invention has said motor.
Invention effect
According to one method of the present invention, it is capable of providing and inhibits cogging torque and the rotor of assembling, motor can be simplified
And electric power steering apparatus.
Detailed description of the invention
Fig. 1 is the schematic cross-section of the motor of an embodiment.
Fig. 2 is the cross-sectional view of the II-II line in Fig. 1 of the motor of an embodiment.
Fig. 3 is the cross-sectional view of the III-III line in Fig. 2 of the motor of an embodiment.
Fig. 4 is the perspective view for showing a part of rotor of an embodiment.
Fig. 5 is the figure for showing a part of motor of an embodiment, is the enlarged cross-sectional view of Fig. 2.
Fig. 6 is the figure for showing a part of motor of an embodiment, is the enlarged cross-sectional view of Fig. 3.
Fig. 7 is the perspective view for showing a part of stator of an embodiment.
Fig. 8 is the figure for showing the waveform of the cogging torque in the motor of an embodiment.
Fig. 9 is the schematic diagram of the electric power steering apparatus of the motor with an embodiment.
Figure 10 is the perspective view for showing the variation of stator of an embodiment.
Figure 11 is the perspective view for showing the variation of rotor of an embodiment.
Specific embodiment
Fig. 1 is the schematic cross-section of the motor 10 of present embodiment.
As shown in Figure 1, motor 10 has rotor 20 and stator 30.
In the following description, the direction parallel with central axis J is referred to as " axial direction " or " up and down direction ", it will be with center
Radial direction centered on axis J is referred to as " radial direction ", by centered on central axis J circumferential direction, i.e. around the side of the axis of central axis J
To referred to as " circumferential direction ".Moreover, in the following description, " overlook view " refers to the state from end on observation.Also, in this explanation
In book, the upside of Fig. 1 in the axial direction of central axis J is referred to as " upside ", downside is referred to as " downside ".On in addition,
Positional relationship and direction when lower direction is not offered as being assembled in actual equipment.Also, in the following figures, in order to easy
Understand each structure, makes actual structure and the scale bar of each structure and quantity etc. different sometimes.
[rotor]
Rotor 20 includes the axis 21 along central axis J extended in the vertical direction configuration；It is fixed on the rotor iron of axis 21
Core 22；1st magnet 23 and the 2nd magnet 24.
For axis 21 by the bearing of multiple bearings 15,16 for that can rotate around central axis J, multiple bearing 15,16 is set to horse
Up to shell 11.Axis 21 be upwardly extended in the side along central axis J it is cylindric.Axis 21 is fixed on by indentation or bonding etc.
Rotor core 22.Also, axis 21 can also be fixed on rotor core 22 by resin component etc..That is, by axis 21 and rotor iron
Core 22 is directly or indirectly fixed up.In addition, axis 21 is also possible to the component of hollow form, it is not particularly limited.
Fig. 2 is the cross-sectional view of the II-II line in Fig. 1 of the motor 10 of present embodiment.Fig. 3 is the horse of present embodiment
The cross-sectional view of the III-III line in Fig. 2 reached.Fig. 4 is the perspective view for showing a part of rotor of present embodiment.Fig. 5
It is the figure for showing a part of motor of present embodiment, is the enlarged cross-sectional view of Fig. 2.Fig. 6 is the horse for showing present embodiment
The figure of a part reached is the enlarged cross-sectional view of Fig. 3.
As shown in Figure 2 and Figure 3, rotor core 22 is the component of tubular.When from end on observation, the shape shape of rotor core 22
Shape is polygon.In the present embodiment, the shape of rotor core 22 is octagon.In other words, rotor core 22 is hollow
Substantially octagon column.In addition, the shape of rotor core 22 is also possible to circle etc..Rotor core 22 is that stacking is more in the axial direction
Stacked steel plate made of a electromagnetic steel plate.Rotor core 22 is provided with the through hole 22h for passing through axis 21 in vertical view center.
As shown in figure 4, the 1st magnet 23 is set to axis a part to the upper side of rotor core 22.1st magnet 23 is along axis
To the component of the plate of extension.
As shown in Fig. 2, the 1st magnet 23 is configured across interval at equal intervals in the circumferential.When from end on observation, the 1st magnet
23 have towards circumferential the 1st side surface part 23s of a pair, the 1st outer surface portion (outer peripheral surface) 23t towards radial outside and towards
1st inner surface portion 23u of radially inner side.
The 1st side surface part 23s of a pair extends from the circumferential both ends of the 1st inner surface portion 23u to radial outside respectively.From axial direction
When observation, the 1st side surface part 23s is in substantially linear.
When from end on observation, the 1st inner surface portion 23u is in substantially linear.1st inner surface portion 23u radially with rotor
The outer diameter face 22f towards radial outside of iron core 22 is opposite.
The end of the circumferential two sides of 1st outer surface portion 23t is connect with the 1st side surface part 23s of a pair.In the present embodiment,
1st outer surface portion 23t is the flexure plane protruded to radial outside, in the arc-shaped centered on central axis J.In addition, outside the 1st
Surface element 23t is not necessarily flexure plane.1st outer surface portion 23t is also possible to plane.That is, when from end on observation, the 1st appearance
The shape of facial 23t can also be linearly.
As shown in figure 4, the 2nd magnet 24 is set at the positions different from the 1st magnet 23 in the axial direction of rotor core 22.
Specifically, the 2nd magnet 24 is set to a part of the axial downside of rotor core 22.2nd magnet 24 with the 1st magnet 23
The mode of lower end in contact configures.In addition, in the axial direction, may exist gap between the 1st magnet 23 and the 2nd magnet 24,
There may be bonding agent or other components etc..
As shown in figure 3, the 2nd magnet 24 is configured across interval at equal intervals in the circumferential.2nd magnet 24 is to axially extend
Plate component.When from end on observation, the 2nd magnet 24 has towards circumferential the 2nd side surface part 24s of a pair, outside towards diameter
2nd outer surface portion (outer peripheral surface) 24t of side and the 2nd inner surface portion 24u towards radially inner side.
The 2nd side surface part 24s of a pair extends from the circumferential both ends of the 2nd inner surface portion 24u to radial outside respectively.From axial direction
When observation, the 2nd side surface part 24s is in substantially linear.
When from end on observation, the 2nd inner surface portion 24u is in substantially linear.2nd inner surface portion 24u radially with rotor
The outer diameter face 22f towards radial outside of iron core 22 is opposite.
The end of the circumferential two sides of 2nd outer surface portion 24t is connect with the 2nd side surface part 24s of a pair.In the present embodiment,
2nd outer surface portion 24t is the flexure plane protruded to radial outside, in the arc-shaped centered on central axis J.2nd outer surface
The radius of curvature of portion 24t is equal with the radius of curvature of the 1st outer surface portion 23t.In addition, the 2nd outer surface portion 24t is not necessarily curved
Curved surface.2nd outer surface portion 24t is also possible to plane.That is, the shape of the 2nd outer surface portion 24t can also be in when from end on observation
Linearly.
Above-mentioned 1st magnet 23 is identical with the magnetic flux density of the 2nd magnet 24, and shape is mutually different.
Specifically, the 1st magnet 23 is identical with the volume of the 2nd magnet 24.Also, the week of the 1st magnet 23 and the 2nd magnet 24
Size at least one direction in, axial and radial direction centered on central axis J is mutually different.
As shown in figure 4, circumferential width W1, W2 of the 1st magnet 23 and the 2nd magnet 24 is mutually different.The circumferential direction of 1st magnet 23
Width W1 is smaller than the circumferential width W2 of the 2nd magnet 24.In 1st magnet 23 and 2nd magnet 24 axially aligned from end on observation
When, 24 to the 1 magnet 23 of the 2nd magnet is more prominent to circumferential two outside.
As shown in figs.5 and 6, the radial thickness T1 and the 2nd magnet centered on central axis J of the 1st magnet 23
The 24 radial thickness T2 centered on central axis J is mutually different.Radially, the thickness of the thick of the 1st magnet 23
It is bigger than the thickness T2 of the thick of the 2nd magnet 24 to spend T1.
As shown in figure 4, in the present embodiment, the axial length L 1 of the 1st magnet 23 and the axial length L 2 of the 2nd magnet 24
It is identical.As above-mentioned, the 1st magnet 23 is identical with the volume of the 2nd magnet 24.Therefore, in the present embodiment, the 1st magnet 23 and the 2nd
Magnet 24 it is equal with the area of section in axially vertical section.
In addition, the axial length L 1 of the 1st magnet 23 can also be different from the axial length L 2 of the 2nd magnet 24.In the situation
Under, the 1st magnet 23 and the 2nd magnet 24 it is mutually different with the area of section in axially vertical section.As an example, it can use
The axial length L 1 of 1 magnet 23 of axial length L 2 to the of 2nd magnet 24 is greatly and the area of section of the 1st magnet 23 is than the 2nd magnetic
The big structure of the area of section of iron 24.Also, as other examples, 2 magnet of axial length L 1 to the of the 1st magnet 23 can be used
The structure that 24 axial length L 2 is big and the area of section of the 2nd magnet 24 is bigger than the area of section of the 1st magnet 23.
The position phase of the position of center Mc1 in the circumferential direction of 1st magnet 23 and the center Mc2 in the circumferential direction of the 2nd magnet 24
Together.
In addition, the position of the center Mc1 in the circumferential direction of the 1st magnet 23 can also be with the center in the circumferential direction of the 2nd magnet 24
The position of Mc2 is different.
1st magnet 23 and the 2nd magnet 24 are made of the magnetic material of identical type.1st magnet 23 and the 2nd magnet 24 difference
It is using the sintered magnet of neodymium series material and using the magnet for cohering magnet, ferrite system material.In addition, 23 He of the 1st magnet
2nd magnet 24 can also be made of the magnetic material of mutually different type.
[stator]
Fig. 7 is the perspective view for showing a part of stator of present embodiment.
Stator 30 has the 1st stator core 31, the 2nd stator core 32, coil 30C (referring to Fig.1) and insulating element 30Z
(referring to Fig.1).1st stator core 31 and the 2nd stator core 32 are centered on central axis J and axially aligned configuration.1st is fixed
The face opposite in the axial direction of sub- 31 and the 2nd stator core 32 of iron core contacts with each other.
Axis a part to the upper side that 1st stator core 31 is configured in stator 30.1st stator core 31 is in the axial direction
Stacked steel plate made of multiple electromagnetic steel plates is laminated.1st stator core 31 has cricoid 1st core-back 37 and the multiple 1st
Tooth 33.In the present embodiment, the 1st stator core 31 is so-called segmentation iron core.1st core-back 37 is by by multiple sectors
Iron core piece 39A circumferentially connect and constitute.
Constituting each iron core piece 39A of the 1st core-back 37, face has multiple 1st slots being recessed towards radially inner side on the outside
39s.Each 1st slot 39s is located at the radial outside of each 1st tooth 33.
In addition, the 1st stator core 31 is not only segmentation iron core, it is also possible to other kinds such as so-called straight iron core or round iron core
The iron core of class.
The inner peripheral surface of each iron core piece 39A is provided with the 1st tooth 33.Medial surface direction of 1st tooth 33 from the 1st core-back 37
Radial outside extends.1st tooth 33 is circumferentially configured across interval at equal intervals in the medial surface of the 1st core-back 37.1st tooth 33
It is opposite with rotor 20 radially.
1st tooth 33 has the 1st umbrella portion 35 in the end of the radially inner side of the 1st tooth 33.1st umbrella portion 35 is from the 1st tooth 33
The end of radially inner side extend to circumferential two sides.It is constituted between adjacent the 1st umbrella portion 35 and the 1st umbrella portion 35 in the circumferential
Gap.In the following description, which is referred to as the 1st open slot 40A.
1st umbrella portion 35 is opposite with the 1st magnet 23 radially.
2nd stator core 32 configures a part on the downside of the axial direction in stator 30.2nd stator core 32 and the 1st stator
The axial lower end in contact of iron core 31 and configure.2nd stator core 32 is engaged in the 1st stator core 31 by riveting etc..2nd
Stator core 32 is stacked steel plate made of multiple electromagnetic steel plates are laminated in the axial direction.As shown in Fig. 3, Fig. 6, Fig. 7, the 2nd stator
Iron core 32 has cricoid 2nd core-back 38 and multiple 2nd teeth 34.
In the present embodiment, the 2nd stator core 32 is so-called segmentation iron core.2nd core-back 38 passes through will be multiple
Fan-shaped iron core piece 39B is circumferentially connected and is constituted.Constitute each iron core piece 39B of the 2nd core-back 38 mask on the outside
There are the multiple 2nd slot 39t being recessed towards radially inner side.Each 2nd slot 39t is located at the radial outside of each 2nd tooth 34.2nd slot 39t's
Circumferential position is identical as the circumferential position of the 1st slot 39s.
In addition, the 2nd stator core 32 is not only segmentation iron core, it is also possible to other kinds such as so-called straight iron core or round iron core
The iron core of class.
The inner peripheral surface of each iron core piece 39B is provided with the 2nd tooth 34.Medial surface direction of 2nd tooth 34 from the 2nd core-back 38
Radial outside extends.2nd tooth 34 is circumferentially configured across interval at equal intervals in the medial surface of the 2nd core-back 38.2nd tooth 34
It is opposite with rotor 20 radially.
2nd tooth 34 has the 2nd umbrella portion 36 in the end of the radially inner side of the 2nd tooth 34.2nd umbrella portion 36 is from the 2nd tooth 34
The end of radially inner side extend to circumferential two sides.It is constituted between adjacent the 2nd umbrella portion 36 and the 2nd umbrella portion 36 in the circumferential
Gap.In the following description, which is referred to as the 2nd open slot 41A.
2nd umbrella portion 36 is opposite with the 2nd magnet 24 radially.
As shown in fig. 7, the 1st tooth 33 is overlapped in the axial direction with the 2nd tooth 34.In width dimensions in the circumferential direction of 1st tooth 33
Heart Mc11 and the center Mc12 of the width dimensions in the circumferential direction of the 2nd tooth 34 overlap in the axial direction.Also, the week of the 1st tooth 33
To the circumferential width dimensions W22 of width dimensions W21 and the 2nd tooth 34 it is identical.
The shape in the 1st umbrella portion 35 and the 2nd umbrella portion 36 is mutually different.Specifically, the 1st umbrella portion 35 and the 2nd umbrella
The circumferential direction in portion 36 and the size at least one direction in axial direction are mutually different.In the present embodiment, the 1st umbrella portion 35
Circumferential width dimensions W11 and the circumferential width dimensions W12 in the 2nd umbrella portion 36 are mutually different.The circumferential direction in the 1st umbrella portion 35
Width W11 is bigger than the circumferential width 12 in the 2nd umbrella portion 36.The circumferential width of the 1st open slot 40A is than the 2nd open slot as a result,
The width of 41A is narrow.
The axial length L 11 in the 1st umbrella portion 35 is identical as the diametrically opposed axial length L 1 of the 1st magnet 23.2nd
The axial length L 12 in umbrella portion 36 is identical as the diametrically opposed axial length L 2 of the 2nd magnet 24.In present embodiment
In, the axial length L 11 in the 1st umbrella portion 35 is identical as the axial length L 12 in the 2nd umbrella portion 36.
Also, in the present embodiment, the axial dimension of the axial dimension of the 1st stator core 31 and the 2nd stator core 32
It is identical.That is, in the axial direction, the size of the 1st core-back 37 is identical as the size of the 2nd core-back 38.In the axial direction, the 1st tooth
33 size is identical as the size of the 2nd tooth 34.
The material of insulating element 30Z (referring to Fig.1) is insulative resin.Coil 30C (referring to Fig.1) is across insulating element
30Z and be wound in the 1st tooth 33 and the 2nd tooth 34.As long as being not limited in addition, the material of insulating element 30Z has insulating properties
Other materials also can be used in resin.
Fig. 8 is the figure for showing the waveform of the cogging torque in the motor of present embodiment.
In the motor 10 of present embodiment, rotor 20 and stator 30 have such as above-mentioned structure.Therefore, such as Fig. 8 institute
Show, the phase of the waveform of the cogging torque generated between the 1st magnet 23 and the 1st stator core 31 is followed in the 2nd magnet 24 and the 2nd
The opposite in phase of the waveform of the cogging torque generated between stator core 32.The cogging torque of motor 10 is by these cogging torques
The cogging torque being synthesized into.Thereby, it is possible to reduce the cogging torque of motor 10.As a result, can reduce in motor 10
The vibration and noise etc. of generation.Also, in the motor of present embodiment 10, compared with previous motor 10, additionally it is possible to reduce
Torque ripple.
According to the present embodiment, the 1st magnet 23 of rotor 20 is identical with the magnetic flux density of the 2nd magnet 24, and shape is mutually not
Together.In this way, can be made by keeping the shape of the 1st magnet 23 and the 2nd magnet 24 mutually different in the 1st magnet 23 and the 1st umbrella portion
The phase of the phase of the cogging torque generated between 35 and the cogging torque generated between the 2nd magnet 24 and the 2nd umbrella portion 36
It mutually staggers.Thereby, it is possible to the cogging torques generated between the 1st magnet 23 and the 1st umbrella portion 35 and in the 2nd magnetic of cancelling out each other
The cogging torque generated between iron 24 and the 2nd umbrella portion 36 reduces the synthesis cogging torque in the motor 10 with rotor 20.Its
As a result, such rotor 20, motor 10 and aftermentioned electric power steering apparatus 500 are able to suppress and generate at work
Vibration and noise.By adopting such structure, without making the 1st magnet 23 and 24 deflection of the 2nd magnet, therefore as a result, energy
Enough simplify assembling procedure.
According to the present embodiment, the 1st magnet 23 is identical with the volume of the 2nd magnet 24.Also, the 1st magnet 23 and the 2nd magnet
The size at least one direction in 24 circumferential direction, the direction central axis J and radial direction centered on central axis J is mutually not
Together.1st magnet 23 is identical with the position of the circumferential center Mc of the 2nd magnet 24.Also, the 1st magnet 23 and the 2nd magnet 24 with
The area of section in axially vertical section is mutually different.Also, the 1st magnet 23 and the 2nd magnet 24 are by the magnetic material of identical type
Material is constituted.
So, even if not making the 1st magnet 23 and 24 deflection of the 2nd magnet, cogging torque can also be easily suppressed.
According to the present embodiment, the 2nd outer surface portion 24t of the 1st outer surface portion 23t and the 2nd magnet 24 of the 1st magnet 23
Outer peripheral surface towards radial outside is radius of curvature same to each other in the arc-shaped centered on central axis J.As a result, can
Enough make the gap between rotor 20 and stator 30 uniform.Thereby, it is possible to inhibit cogging torque, and keep the flowing of magnetic flux smooth,
Increase torque.
According to the present embodiment, the width dimensions in the 1st umbrella portion 35 of stator 30 and the circumferential direction in the 2nd umbrella portion 36 are mutual
It is different.In this way, can be made by keeping the shape in the 1st umbrella portion 35 and the 2nd umbrella portion 36 mutually different in the 1st magnet 23 and the 1st
The phase of the cogging torque generated between umbrella portion 35 and the cogging torque generated between the 2nd magnet 24 and the 2nd umbrella portion 36
Phase mutually stagger.Thereby, it is possible to cancel out each other the cogging torque generated between the 1st magnet 23 and the 1st umbrella portion 35 and
The cogging torque generated between the 2nd magnet 24 and the 2nd umbrella portion 36 reduces the synthesis tooth socket in the motor 10 with stator 30
Torque.As a result, being able to suppress the vibration generated in motor 10 and noise.By adopting such structure, being not necessarily to edge
The circumferential position of axially varying tooth, therefore as a result, winding process can be simplified.
According to the present embodiment, the circumferential direction and at least one direction in axial direction in the 1st umbrella portion 35 and the 2nd umbrella portion 36
On size it is mutually different.Thereby, it is possible to make the phase of the cogging torque generated between the 1st magnet 23 and the 1st umbrella portion 35
And the phase of the cogging torque generated between the 2nd magnet 24 and the 2nd umbrella portion 36 mutually staggers.
According to the present embodiment, the 1st tooth 33 and the 2nd tooth 34 are configured at identical position in the circumferential, the width in circumferential direction
It is identical to spend size.More easily make the phase of the cogging torque generated between the 1st magnet 23 and the 1st umbrella portion 35 as a result,
And the phase shifting of the cogging torque generated between the 2nd magnet 24 and the 2nd umbrella portion 36.Thereby, it is possible to reduce in motor 10
Synthesis cogging torque.As a result, being able to suppress the vibration generated in motor 10 and noise.Also, due to the 1st tooth 33
It is identical that the shape at position of conducting wire of coil 30C is constituted with the winding of the 2nd tooth 34, therefore even if in the 1st umbrella portion 35 and the 2nd
In the case that the width dimensions in umbrella portion 36 are mutually different, also can easily by Wire-wound in the 1st tooth 33 and the 2nd tooth 34 and
Constitute coil 30C.
According to the present embodiment, the axial length L 11 in the 1st umbrella portion 35 and the axial length L 12 in the 2nd umbrella portion 36 with
The length L1 of the 1st diametrically opposed magnet 23 and the length L2 of the 2nd magnet 24 are identical.As a result, in the 1st tooth 33 and
In 2 teeth 34, the shape for having wound the position of the conducting wire of composition coil 30C is identical.Therefore, even if in the variform of umbrella portion
In the case of, also can easily coiled electrical conductor and constitute coil 30C.
[electric power steering apparatus]
Fig. 9 schematically shows the electric power steering apparatus 500 of the motor 10 with present embodiment.
As shown in figure 9, electric power steering apparatus 500 is set to the vehicles such as automobile.Electric power steering apparatus 500 has
Steering system 520 and assist torque mechanism 540.
Steering system 520 is for example with steering wheel 521, steering shaft 522 (also referred to as " steering column "), Hooks coupling universal coupling
523A, 523B, rotary shaft 524 (also referred to as " pinion shaft " or " input shaft "), rack and pinion mechanism 525, rack shaft 526, a left side
Right ball-and-socket joint 552A, 552B, pull rod 527A, 527B, the steered wheel of knuckle 528A, 528B and left and right are (such as left
Right front-wheel) 529A, 529B.
Steering wheel 521 is connect by steering shaft 522 and Hooks coupling universal coupling 523A, 523B with rotary shaft 524.Rotary shaft
524 connect by rack and pinion mechanism 525 with rack shaft 526.Rack and pinion mechanism 525, which has, is set to rotary shaft 524
Pinion gear 531 and the rack gear 532 for being set to rack shaft 526.The right end of rack shaft 526 is by ball-and-socket joint 552A, pull rod 527A
And knuckle 528A and connect with the steered wheel 529A on right side.The left end of rack shaft 526 is by ball-and-socket joint 552B, pull rod
527B and knuckle 528B and connect with the steered wheel 529B in left side.Here, right side and left side respectively with drive from being sitting in
Right side and the left side for sailing driver's observation on seat are consistent.
Steering system 520 operates steering wheel 521 by driver and generates steering torque.Torque is turned to via rack pinion
Mechanism 525 and be transmitted to left and right steered wheel 529A, 529B.As a result, driver can operate left and right steered wheel 529A,
529B。
Assist torque mechanism 540 for example with turn to torque sensor 541, ECU542, motor 543, deceleration mechanism 544 with
And power inverter 545.Assist torque is supplied to the steered wheel from steering wheel 521 to left and right by assist torque mechanism 540
The steering system 520 of 529A, 529B.In addition, assist torque is sometimes referred to as " additional torque ".
Motor 543 is equivalent to the motor 10 in present embodiment.
Turn to the steering torque for the steering system 520 that the detection of torque sensor 541 is assigned by steering wheel 521.ECU542
It is generated according to the detection signal (hereinafter referred to as " dtc signal ") for carrying out low damage torque sensor 541 and is used for drive motor 543
Driving signal.Motor 543 generates assist torque corresponding with torque is turned to according to driving signal.Assist torque is via deceleration
Mechanism 544 and the rotary shaft 524 for being transmitted to steering system 520.Deceleration mechanism 544 is, for example, worm gear mechanism.Assist torque
Rack and pinion mechanism 525 is transmitted to from rotary shaft 524 again.
The position of steering system 520 is imparted to according to assist torque, electric power steering apparatus 500 can be categorized into small
Gear auxiliary type, rack gear auxiliary type and column-assisted etc..Pinion gear auxiliary electric power steering device is instantiated in Fig. 9
500.But electric power steering apparatus 500 is also possible to rack gear auxiliary type, column-assisted etc..
ECU542 can not only be entered dtc signal, such as can also be entered speed signal.External equipment 560 is for example
It is vehicle speed sensor.Alternatively, external equipment 560 is also possible to that such as CAN (Controller Area Network) can be utilized
Other ECU that equal in-vehicle networks are communicated.The microcontroller of ECU542 can be right according to dtc signal or speed signal etc.
Motor 543 carries out vector controlled or PWM control.
Electric power steering apparatus 500 turns to torque plus multiple obtained by the assist torque of motor 543 using driver's
Resultant torque operates steered wheel 529A, 529B of left and right.
(variation of stator)
Figure 10 is the partial perspective view of the stator 130 for the variation that can be used in the above-described embodiment.In this deformation
In example, the structure in addition to stator 130 is identical as above embodiment.That is, stator 130 radially with above embodiment
Rotor 20 (referring to Fig. 4) is opposite.
As shown in Figure 10, the stator 130 of this variation have radially with the 1st magnet 23 shown in Fig. 4 and the 2nd magnetic
The opposite umbrella portion 135 of iron 24.Umbrella portion 135 is axially extended with identical width dimensions.
It, also can be by using above-mentioned reality even if the width dimensions edge in umbrella portion 135 is axial identical as shown in this variation
Rotor 20 shown in mode are applied, make the phase of the cogging torque generated between the 1st magnet 23 and umbrella portion 135 and in the 2nd magnetic
The phase of the cogging torque generated between iron 24 and umbrella portion 135 mutually staggers.Thereby, it is possible to reduce the motor with rotor 20
Synthesis cogging torque in 10.
(variation of rotor)
Figure 11 is the rotor 220 of the variation of above embodiment.In this variation, the structure in addition to rotor 220
It is identical as above embodiment.That is, rotor 220 is opposite with the stator of above embodiment 30 (referring to Fig. 7) radially.
As shown in figure 11, the rotor 220 of this variation have radially with the 1st umbrella portion 35 and the 2nd umbrella portion 36
Opposite magnet 123.Magnet 123 is axially extended with identical width dimensions.
It, also can be by using above-mentioned implementation even if the width dimensions edge of magnet 123 is axial identical as shown in this variation
Stator 30 shown in mode make the phase of the cogging torque generated between magnet 123 and the 1st umbrella portion 35 and in magnet 123
The phase of the cogging torque generated between the 2nd umbrella portion 36 mutually staggers.Thereby, it is possible to reduce the motor 10 with stator 30
In synthesis cogging torque.
More than, one embodiment of the present invention and its variation are illustrated, but embodiment and deformation
Each structure and their combination in example etc. are an examples, without departing from the spirit and scope of the invention, are able to carry out structure
It is additional, omit, displacement and other changes.Also, the present invention is not limited by embodiment.
For example, the 1st stator core 31 and the axial length L 1 of the 2nd stator core 32, L2 can also be mutually different.That is, In
In axial direction, the length L1 of the 1st core-back 37 can also be different from the length L2 of the 2nd core-back 38.Also, the 1st umbrella portion
35 axial length L 11 can also be different from the axial length L 12 in the 2nd umbrella portion 36.
Also, the 1st magnet 23 and the 2nd magnet 24 can also be made of the magnetic material of mutually different type.By being set as
Such structure also can be by making even if the 1st magnet 23 and the 2nd magnet 24 are made of the magnetic material of mutually different type
The shape of 1st magnet 23 and the 2nd magnet 24 is mutually different, makes the opposite in phase of cogging torque.Thereby, it is possible to cancel out each other
The cogging torque generated and the tooth generated between the 2nd magnet 24 and the 2nd umbrella portion 36 between 1 magnet 23 and the 1st umbrella portion 35
Slot torque reduces the synthesis cogging torque in the motor 10 with stator 30.It is generated in motor 10 as a result, being able to suppress
Vibration and noise.
Also, in the above-described embodiment, to two magnet (1st mutually different and axially aligned with shape
Magnet 23 and the 2nd magnet 24) rotor 20 be illustrated.But rotor also can have axially aligned three with
On magnet.In this case, as long as the shape of at least two magnet in three or more axially aligned magnet is mutual
Difference.
Similarly, in the above-described embodiment, mutually different and axially aligned to the width dimensions with circumferential direction
The stator 30 of two umbrella portions (the 1st umbrella portion 35 and the 2nd umbrella portion 36) is illustrated.But stator also can have
Three or more axially aligned umbrella portions.In this case, as long as in three or more axially aligned umbrella portions
The width dimensions at least two umbrella portions are mutually different.
The motor 10 of above embodiment and its variation is not limited to electric power steering apparatus 500, such as can
It is widely used in the various equipment that dust catcher, hair dryer, ceiling fan, washing machine, refrigerator etc. have various motors.
Symbol description
The motor of 2 ... CL, 10,543 ..., 20,220 ... rotors, 21 ... axis, 22 ... rotor cores, 23 ...
1st magnet, the 1st outer surface portion (outer peripheral surface) of 23t ..., 24 ... the 2nd magnet, the 2nd outer surface portion (outer peripheral surface) of 24t ...,
30,130 ... stators, 30C ... coil, 31 ... the 1st stator cores, 32 ... the 2nd stator cores, 33 ... the 1st teeth,
34 ... the 2nd teeth, 35 ... the 1st umbrella portions, 36 ... the 2nd umbrella portions, 37 ... the 1st core-backs, 38 ... the 2nd iron cores back
Portion, 123 ... magnet, 135 ... umbrella portions, 500 ... electric power steering apparatus.
Claims (13)
1. a kind of rotor, includes
Axis, the axis are rotated centered on the central axis vertically extended；
Rotor core, the rotor core are fixed on the axis；
Multiple 1st magnet, the multiple 1st magnet are set to axial a part of the rotor core, the multiple 1st magnetic
Iron is configured across interval in the circumferential；And
Multiple 2nd magnet, the multiple 2nd magnet are set to different from the 1st magnet in the axial direction of the rotor core
Position at, the multiple 2nd magnet is configured across interval in the circumferential,
1st magnet is identical with the magnetic flux density of the 2nd magnet, and shape is mutually different.
2. rotor according to claim 1, wherein
1st magnet is identical with the volume of the 2nd magnet.
3. rotor according to claim 1 or 2, wherein
1st magnet and the 2nd magnet it is circumferential, axially and radially at least one direction on size mutually not
Together.
4. rotor as claimed in any of claims 1 to 3, wherein
1st magnet is identical with the position at the center in the circumferential of the 2nd magnet.
5. rotor as claimed in any of claims 1 to 4, wherein
1st magnet and the 2nd magnet are mutually different with the area of section on axially vertical section.
6. rotor as claimed in any of claims 1 to 5, wherein
1st magnet and the 2nd magnet are made of the magnetic material of identical type.
7. rotor as claimed in any of claims 1 to 6, wherein
1st magnet and the 2nd magnet are made of the magnetic material of mutually different type.
8. rotor as claimed in any of claims 1 to 7, wherein
The outer peripheral surface towards radial outside of 1st magnet and the 2nd magnet is in the circle centered on the central axis
Arcuation, and there is radius of curvature same to each other.
9. a kind of motor, includes
Rotor described in any one of claim 1 to 8；And
Stator, the stator are opposite with the rotor across gap radially.
10. motor according to claim 9, wherein
The stator includes
Multiple 1st teeth, the multiple 1st tooth are configured across interval in the circumferential；
1st umbrella portion, the 1st umbrella portion are set to the end of the radially inner side of the 1st tooth, and the 1st umbrella portion is in diameter
It is opposite with the 1st magnet upwards；
Multiple 2nd teeth, the multiple 2nd tooth are configured across interval in the circumferential；And
2nd umbrella portion, the 2nd umbrella portion are set to the end of the radially inner side of the 2nd tooth, and the 2nd umbrella portion is in diameter
It is opposite with the 2nd magnet upwards,
The 1st umbrella portion and the width dimensions of the 2nd umbrella portion in the circumferential are mutually different.
11. motor according to claim 10, wherein
The position that 1st tooth and the 2nd tooth configuration overlap in the axial direction in the center of width dimensions in the circumferential
Place, the 1st tooth are identical with the width dimensions of the 2nd tooth in the circumferential.
12. motor described in 0 or 11 according to claim 1, wherein
The axial length in the 1st umbrella portion and the 2nd umbrella portion and diametrically opposed the 1st magnet and described
The axial length of 2nd magnet is identical.
13. a kind of electric power steering apparatus, with motor described in any one of claim 9 to 12.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762479482P | 2017-03-31 | 2017-03-31 | |
| US62/479,482 | 2017-03-31 | ||
| JP2017176860 | 2017-09-14 | ||
| JP2017-176860 | 2017-09-14 | ||
| PCT/JP2018/010598 WO2018180637A1 (en) | 2017-03-31 | 2018-03-16 | Rotor, motor, and electric power steering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110462983A true CN110462983A (en) | 2019-11-15 |
Family
ID=68481061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880022442.2A Pending CN110462983A (en) | 2017-03-31 | 2018-03-16 | Rotor, motor and electric power steering apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPWO2018180637A1 (en) |
| CN (1) | CN110462983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328597A (en) * | 2020-02-28 | 2021-08-31 | 日本电产株式会社 | Motor |
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| JP5469955B2 (en) * | 2009-08-12 | 2014-04-16 | 日立オートモティブシステムズ株式会社 | Rotating electric machine for vehicles |
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| JPH01122353A (en) * | 1987-11-04 | 1989-05-15 | Brother Ind Ltd | Synchronous ac servomotor |
| JPH08331784A (en) * | 1995-03-24 | 1996-12-13 | Hitachi Metals Ltd | Permanent-magnet type rotary electric machine |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018180637A1 (en) | 2020-02-06 |
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Application publication date: 20191115 |