CN106225980A - Non-contact torque sensor - Google Patents
Non-contact torque sensor Download PDFInfo
- Publication number
- CN106225980A CN106225980A CN201610620070.6A CN201610620070A CN106225980A CN 106225980 A CN106225980 A CN 106225980A CN 201610620070 A CN201610620070 A CN 201610620070A CN 106225980 A CN106225980 A CN 106225980A
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- China
- Prior art keywords
- magnetic
- tooth
- yoke
- magnetic force
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
- G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering
Abstract
A kind of non-contact torque sensor, including magnetic force generating unit and magnetic force conducting parts.Described magnetic force generating unit includes the multiple magnets pair being radially directed towards being evenly distributed on same circumference.Described magnetic force conducting parts includes coaxially be oppositely arranged two the annular yokes being installed on the skeleton of same non-magnet material, respectively has the internal ring yoke of multiple magnetic conduction internal tooth and has the outer shroud yoke of multiple magnetic conduction external tooth.Described torque sensor by the magnet organized in the magnetic force acquisition component magnetic field to producing more, by magnetic conduction tooth to conduction to internal ring yoke, outer shroud yoke, draw yoke and air gap therebetween, constitute the magnetic circuit of a Guan Bi.The internal tooth of described magnetic conduction tooth pair is radially respectively arranged at the inner side and outer side of magnetic conduction tooth pair with external tooth, reduces flux leakage amount, reduces the magnetic resistance of closed magnetic circuit, thus improve the sensitivity of sensor, add the linearity of sensor signal.Owing to improve the sensitivity of described torque sensor, sensor magnetic force generating unit and the physical dimension of magnetic force conducting parts can be reduced, thus reduce the material cost of sensor.
Description
Technical field
The present invention relates to sensor technical field, specifically, be that a kind of contactless position for measuring moment of torsion passes
Sensor.
Background technology
The performance of automobile steering system is for guaranteeing the comfortableness that the safe driving of vehicle, control stability and improvement are driven
Etc. aspect play an important role.In the servo steering system of automobile, need to detect two be coupled to each other in steering
The power actuator that relatively turns of individual axostylus axostyle is determined the size of power-assisted by controller output signal.For electric boosting steering system
Speech, booster steering controller exports control signal according to the size of moment of torsion, and boosting motor is determined by controller output signal and helps
The size of power, the size of moment of torsion is then detected by torque sensor.
Generally torque sensor is categorized into contact and contactless.But, owing to contact torque sensor has
Produce noise and the poor problem of durability, so it is presently preferred to non-contact torque sensor.
In the prior art, by illustrating the sensor of a kind of prior art known to Chinese patent CN101002078A, its
There is the first magnetic rotor structure, its comprise multiple be radially directed towards along the equally distributed magnet of same circumference；Second stator knot
Structure, it comprises two rings, and they extend into that be axially directed to and overlap tooth, and the tooth of two stators interlocks along same circumference
Distribution.This structure result in has less gap between the flank that two stators are overlapping, and this causes two stators overlaps
The increase of the flux leakage amount between flank, therefore reduces the sensitivity of sensor, and adds the non-thread of sensor signal
Property characteristic.
In the scheme of this structure, although the overlap length of stator tooth can be reduced by the length shortening stator tooth, with this
Reduce the flux leakage between the flank that stator is overlapping, but, this technical scheme result in the spirit of the sensor being restricted
Sensitivity.
In the scheme of this structure, can use and increase the magnetic energy product of magnet rotor magnetic material and increase magnetic force conducting parts
Size and thickness increase sensor sensitivity, but, this technical scheme result in the increase of sensor cost.
It is noted that this torque sensor is mainly used in the servo steering system of automobile, due to motor turning
The steering column power shaft of system and the relative rotation of output shaft are the least, typically ± 4o、±5oOr ± 8oWithin, so this knot
The torque sensor of structure is incompatible to the requirement of sensitivity and the linearity and the target of sensor low cost.
Summary of the invention
The flux leakage amount that the present invention is directed to measure present in above-mentioned existing torque sensor structure magnetic circuit is big, sensitivity
Low, the non-linear and problem of high cost, it is proposed that a kind of new non-contact torque sensor.
The non-contact torque sensor of the present invention, including magnetic force generating unit and magnetic force conducting parts.
Described magnetic force generating unit includes the multiple magnets pair being radially directed towards being evenly distributed on same circumference, described often
Individual magnet is to including two magnets being radially directed towards, and the magnetic pole radial of described two magnets of magnet centering is arranged alternately；
Described magnetic force conducting parts includes coaxially be oppositely arranged two be installed on the skeleton of same non-magnet material
Individual annular yoke, respectively has the internal ring yoke of multiple magnetic conduction internal tooth and has the outer shroud yoke of multiple magnetic conduction external tooth,
Internal ring yoke and outer shroud yoke are coaxially disposed with described magnetic force generating unit, the interior number of teeth of internal ring yoke and the external tooth of outer shroud yoke
Number is identical with the magnet pairs of described magnetic force generating unit.The internal tooth of described internal ring yoke constitutes multiple with the external tooth of outer shroud yoke
Magnetic conduction tooth pair, the internal tooth of described each magnetic conduction tooth pair is positioned at same radial position with external tooth.
According to an aspect of the present invention, described magnet is pointed between internal tooth and the external tooth of magnetic conduction tooth pair.
According to an aspect of the present invention, the diameter of the excircle of described internal tooth is less than straight to place inner periphery of magnet
Footpath, the diameter of the inner periphery of described external tooth is more than the magnet diameter to place excircle.
According to an aspect of the present invention, the inner periphery of the excircle of described internal tooth and magnet pair be radially arranged gas
Gap, the inner periphery of described external tooth has been radially arranged air gap with the excircle of magnet pair.
According to an aspect of the present invention, a magnetic conduction tooth pair and a magnet are to one magnetic force acquisition component of composition.
According to an aspect of the present invention, described magnetic force acquisition component arranges multiple at same even circumferential.
According to an aspect of the present invention, described magnet farther includes magnetic force leads component to torque sensor, described
Magnetic force leads component two extraction yokes including being oppositely arranged, described magnetic force conducting parts is being drawn between yoke, institute
State and be provided with air gap between extraction yoke, described air gap is provided with at least one magnetic induction part.
According to an aspect of the present invention, described torque sensor by the magnet organized in magnetic force acquisition component more to produce
Magnetic field, by magnetic conduction tooth to conduction to internal ring yoke, outer shroud yoke, extraction yoke and air gap therebetween, constitutes one
The magnetic circuit of Guan Bi.
According to an aspect of the present invention, described magnetic force generating unit and magnetic force conducting parts respectively by identical axially with
Two axostylus axostyles (power shaft and output shaft) of steering connect, and described power shaft and output shaft are respectively fixedly connected with in torsion bar two
End.
According to an aspect of the present invention, when the mechanical zero of torque sensor, the most described power shaft and described output
When axle relative rotation angle is zero, the radial direction neutrality line of the magnetic conduction tooth pair of described same group of magnetic force acquisition component and magnet pair
Radially neutrality line alignment, the magnetic conduction tooth pair of the most described inner and outer rings yoke and the magnetic of left and right two magnets with group magnet pair
Logical area is identical.
According to an aspect of the present invention, at described power shaft relative to described output shaft to anticlockwise time, described same
The magnetic conduction tooth pair of group magnetic force acquisition component with the magnetic flux area change of a left side (right) magnet with group magnet pair greatly, and with to the right side
The magnetic flux area of (left) magnet diminishes；If described power shaft relative to described output shaft to right rotation, the most described same group of magnetic
The magnetic conduction tooth pair of power acquisition component with the magnetic flux area change of the right side (left) magnet with group magnet pair greatly, and with to a left side (right)
The magnetic flux area of magnet diminishes.
The invention has the beneficial effects as follows: described torque sensor by the magnet organized in magnetic force acquisition component more to produce magnetic
, by magnetic conduction tooth to conduction to internal ring yoke, outer shroud yoke, extraction yoke and air gap therebetween, constitute one and close
The magnetic circuit closed.The internal tooth of described magnetic conduction tooth pair is radially respectively arranged at the inner side and outer side of magnetic conduction tooth pair with external tooth, reduces
Flux leakage amount, reduces the magnetic resistance of closed magnetic circuit, thus improves the sensitivity of sensor, add sensor signal
The linearity.Owing to improve the sensitivity of described torque sensor, sensor magnetic force generating unit and magnetic force conduction can be reduced
The physical dimension of parts, thus reduce the material cost of sensor.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of this non-contact torque sensor；
Accompanying drawing 2 is the structural representation one of this non-contact torque sensor magnetic force acquisition component；
Accompanying drawing 3 is the structural representation two of this non-contact torque sensor magnetic force acquisition component；
Accompanying drawing 4 is the structural representation three of this non-contact torque sensor magnetic force acquisition component.
In figure, 1 magnetic force generating unit, 2 left magnets, 3 right magnets, 4 internal ring yokes, 5 outer shroud yokes, 6
Internal tooth, 7 external tooths, draw yoke on 8, draw yoke, 10 air gaps, 11 magnetic induction parts 9 times.
Detailed description of the invention
In order to be able to further appreciate that the structure of the present invention, feature and other purpose, detailed in conjunction with appended preferred embodiment
Being described as follows, illustrated preferred embodiment is merely to illustrate technical scheme, and the non-limiting present invention.
The detailed description of the invention of the present invention is as follows:
Fig. 1 shows the view of sensor of the invention structure.As it is shown in figure 1, this non-contact torque sensor includes
Magnetic force generating unit 1, magnetic force conducting parts and magnetic force leads component
Magnetic force generating unit includes magnet pair, and magnet is to including two magnets being radially directed towards.Magnet centering left magnet 2 He
The magnetic pole radial of right magnet 3 is alternately arranged.
Magnetic force conducting parts includes two the annular yokes being coaxially oppositely arranged, and respectively has multiple magnetic conduction internal tooth 6
Internal ring yoke 4 and there is the outer shroud yoke 5 of multiple magnetic conduction external tooth 7, internal ring yoke 4 and outer shroud yoke 5 are produced with described magnetic force
Raw element coaxial is arranged, and internal tooth 6 number of internal ring yoke 4 and the external tooth 7 of outer shroud yoke 5 count the magnet with described magnetic force generating unit
Logarithm is identical.The internal tooth 6 of described internal ring yoke 4 and the external tooth 7 of outer shroud yoke 5 constitute multiple magnetic conduction tooth pair, described each magnetic
The internal tooth 6 of conduction tooth pair is positioned at same radial position with external tooth 7.
Magnet is pointed between internal tooth 6 and the external tooth 7 of magnetic conduction tooth pair.The diameter of the excircle at internal tooth 6 place is less than magnetic
The body diameter to place inner periphery；The diameter of the excircle at external tooth 7 place is more than the magnet diameter to place excircle.
The magnet that the multipair magnetic pole being radially directed towards is alternately arranged is fixed on non-magnet material to by identical radial position
On skeleton.The internal tooth 6 of internal ring yoke 4 and the external tooth 7 of outer shroud yoke 5 are in couples by identical radially fixed in nonferromagnetic material
On skeleton, wherein multiple internal tooths 6 of internal ring yoke 4 are evenly distributed in the outer surface of interior cylindrical yoke installing rack, its outer shroud
Multiple external tooths 7 of yoke 5 are evenly distributed in the inner surface of cylindrical tubular yoke installing rack.
Magnet to magnetic conduction tooth to according to identical the most respectively with two axostylus axostyles (output shaft and inputs of steering
Axle) connect.In sensor, a magnetic conduction tooth pair and a magnet are to one magnetic force acquisition component of composition.
Magnetic force leads component includes two the extraction yokes being oppositely arranged, and is respectively upper extraction yoke 8 and lower extraction yoke
9, internal ring yoke 4 and outer shroud yoke 5 are between upper extraction yoke 8 and lower extraction yoke 9.Upper extraction yoke 8 and lower extraction magnetic
Air gap 10 it is provided with between yoke 9.
The magnetic flux conduction that magnetic force generating unit 1 is produced by the internal ring yoke 4 of magnetic force conducting parts and outer shroud yoke 5 is to solid
The magnetic force leads component being scheduled on sensor housing, and pass through upper extraction yoke 8 and lower extraction yoke 9 general of magnetic force leads component
Magnetic flux conduction, to measuring in air gap 10, constitutes the magnetic circuit of a Guan Bi with this.1 magnetic induction is at least disposed in air gap 10
Element 11, magnetic induction part 11 receives the variable quantity of magnetic flux density in the magnetic circuit of Guan Bi in real time, measures two axostylus axostyles with this (defeated
Shaft and power shaft) moment of torsion.
Fig. 2,3 and 4 show that the magnetic force of sensor required for protection produces and the geometry of conduction portion and master
Want the explanatory view of magnetic force change relation between parts.
Fig. 2 shows that magnetic force generating unit 1 is the feelings of zero relative to internal ring yoke 4 and outer shroud yoke 5 relative rotation angle
Shape.In this case, the conduction internal tooth 6 of tooth pair of the magnetic in described magnetic force acquisition component and external tooth 7 are positioned at the left magnetic of magnet centering
Same radial position in the middle of body 2 and right magnet 3.Left and right two magnets of at this moment described internal tooth 6 and external tooth 7 and magnet pair
Magnetic flux area identical.Sensor is in neutral condition, and the relative magnetic field strength of internal ring yoke 4 and outer shroud yoke 5 is zero, magnetic strength
The magnetic flux density answering element 11 to detect also is zero, and now moment of torsion is zero.
Fig. 3 show magnetic force generating unit 1 relative to internal ring yoke 4 and outer shroud yoke 5 to the situation of anticlockwise, in these feelings
Under shape, in described magnetic force acquisition component, internal tooth 6 and the external tooth 7 of magnetic conduction tooth pair are positioned at the magnet position to inclined right magnet 3.This
Internal tooth 6 and the external tooth 7 of Shi Suoshu become big relative to the magnetic flux area of the right magnet 3 of magnet pair, and relative to the magnetic flux of left magnet 2
Area diminishes.The magnetic direction of the magnet pair as described in Fig. 3, the inner side and outer side of left magnet 2 is respectively S pole and N level, right magnet
The inner side and outer side of 3 is respectively N pole and S level, then the magnetic polarity of internal tooth 6 is N pole, and the magnetic polarity of external tooth 7 is S pole, magnetic induction
Element 11 detects magnetic direction and magnetic flux density with this, and wherein magnetic field intensity and magnetic force generating unit 1 are relative to internal ring yoke 4
It is directly proportional to the angle of anticlockwise with outer shroud yoke 5.
Fig. 4 show magnetic force generating unit 1 relative to internal ring yoke 4 and the dextrorotary situation of outer shroud yoke 5, in these feelings
Under shape, in described magnetic force acquisition component, internal tooth 6 and the external tooth 7 of magnetic conduction tooth pair are positioned at the magnet position to inclined left magnet 2.This
Internal tooth 6 and the external tooth 7 of Shi Suoshu become big relative to the magnetic flux area of the left magnet 2 of magnet pair, and relative to the magnetic flux of right magnet 3
Area diminishes.The magnetic direction of the magnet pair as described in Fig. 4, the inner side and outer side of left magnet 2 is respectively S pole and N level, right magnet
The inner side and outer side of 3 is respectively N pole and S level, then the magnetic polarity of internal tooth 6 is S pole, and the magnetic polarity of external tooth 7 is N pole, magnetic induction
Element 11 detects magnetic direction and magnetic flux density with this, and wherein magnetic field intensity and magnetic force generating unit 1 are relative to internal ring yoke 4
Angle dextrorotary with outer shroud yoke 5 is directly proportional.
Claims (8)
1. a non-contact torque sensor, it is characterised in that include magnetic force generating unit and magnetic force conducting parts,
Described magnetic force generating unit includes the multiple magnets pair being evenly distributed on same circumference, and each magnet is to including two footpaths
To the magnet pointed to, the magnetic pole radial of described two magnets of magnet centering is arranged alternately；
Described magnetic force conducting parts includes two annular yokes, respectively has the internal ring yoke of multiple magnetic conduction internal tooth and has
The outer shroud yoke of multiple magnetic conduction external tooth；
Described magnetic conduction internal tooth is identical with the quantity of described magnet pair with the quantity of magnetic conduction external tooth；
Described magnetic force conducting parts is coaxial with magnetic force generating unit, internal ring yoke and the axially opposing setting of outer shroud yoke, internal ring magnetic
Each magnetic conduction internal tooth of yoke is positioned at same radial position with outer shroud yoke magnetic conduction external tooth, and each magnetic conducts
Internal tooth is all positioned at the magnetic conduction external tooth of same radial position and constitutes a magnetic conduction tooth pair with it.
Non-contact torque sensor the most according to claim 1, it is characterised in that described magnet is pointed to magnetic conduction tooth
To magnetic conduction internal tooth and magnetic conduction external tooth between.
Non-contact torque sensor the most according to claim 1 and 2, it is characterised in that the internal tooth of described internal ring yoke
Outer diameter of a circle less than the interior diameter of a circle of described magnet pair, the interior diameter of a circle of the external tooth of described outer shroud yoke is more than described
The outer diameter of a circle of magnet pair.
Non-contact torque sensor the most according to claim 1 and 2, it is characterised in that be 1 time institute at surveyed moment of torsion
State each magnet and be pointed to same radial position to a magnetic conduction tooth.
Non-contact torque sensor the most according to claim 1 and 2, it is characterised in that outside described magnetic conduction internal tooth
The inner periphery of circumference and magnet pair be radially arranged air gap, the inner periphery of described magnetic conduction external tooth and the excircle of magnet pair
It is radially arranged air gap.
Non-contact torque sensor the most according to claim 1 and 2, it is characterised in that each magnetic described conduction tooth
To all with a magnet to composition one magnetic force acquisition component.
Non-contact torque sensor the most according to claim 6, it is characterised in that described magnetic force acquisition component is same
Even circumferential arranges multiple.
Non-contact torque sensor the most according to claim 1 and 2, it is characterised in that described torque sensor enters one
Step includes magnetic force leads component,
Described magnetic force leads component includes two the extraction yokes being oppositely arranged, and described magnetic force conducting parts is positioned at extraction yoke
Between, it is provided with air gap between described extraction yoke, described air gap is provided with at least one magnetic induction part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610620070.6A CN106225980A (en) | 2016-07-31 | 2016-07-31 | Non-contact torque sensor |
| PCT/CN2017/094071 WO2018024126A1 (en) | 2016-07-31 | 2017-07-24 | Contactless torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610620070.6A CN106225980A (en) | 2016-07-31 | 2016-07-31 | Non-contact torque sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106225980A true CN106225980A (en) | 2016-12-14 |
Family
ID=57535541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610620070.6A Pending CN106225980A (en) | 2016-07-31 | 2016-07-31 | Non-contact torque sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106225980A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024126A1 (en) * | 2016-07-31 | 2018-02-08 | 青岛三祥高科汽车电子有限公司 | Contactless torque sensor |
| US20220214236A1 (en) * | 2019-05-22 | 2022-07-07 | Lg Innotek Co., Ltd. | Sensing device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005011196A1 (en) * | 2005-03-09 | 2006-09-14 | Robert Bosch Gmbh | Steering column torque detecting sensor arrangement for motor vehicle, has magnetic circuit with flux rings designed as ferromagnetic rings, such that sensor unit and wheel are arranged between inner flux ring and outer flux ring |
| CN101002078A (en) * | 2004-07-09 | 2007-07-18 | 移动磁体技术公司 | Position sensor which is intended, in particular, for measuring steering column torsion |
| US20070295109A1 (en) * | 2006-06-23 | 2007-12-27 | Jtekt Corporation | Torque detecting device and manufacturing method of yoke assembly |
| JP2011089783A (en) * | 2009-10-20 | 2011-05-06 | Honda Lock Mfg Co Ltd | Torque sensor |
| CN103424216A (en) * | 2012-05-25 | 2013-12-04 | 株式会社电装 | Torque sensor |
| CN103808443A (en) * | 2012-11-08 | 2014-05-21 | Lg伊诺特有限公司 | Torque measurement device |
| CN104655338A (en) * | 2013-11-18 | 2015-05-27 | 联创汽车电子有限公司 | Non-contact torque sensor magnetic circuit structure |
| CN205958165U (en) * | 2016-07-31 | 2017-02-15 | 青岛三祥高科汽车电子有限公司 | Non -contact torque sensor |
-
2016
- 2016-07-31 CN CN201610620070.6A patent/CN106225980A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101002078A (en) * | 2004-07-09 | 2007-07-18 | 移动磁体技术公司 | Position sensor which is intended, in particular, for measuring steering column torsion |
| DE102005011196A1 (en) * | 2005-03-09 | 2006-09-14 | Robert Bosch Gmbh | Steering column torque detecting sensor arrangement for motor vehicle, has magnetic circuit with flux rings designed as ferromagnetic rings, such that sensor unit and wheel are arranged between inner flux ring and outer flux ring |
| US20070295109A1 (en) * | 2006-06-23 | 2007-12-27 | Jtekt Corporation | Torque detecting device and manufacturing method of yoke assembly |
| JP2011089783A (en) * | 2009-10-20 | 2011-05-06 | Honda Lock Mfg Co Ltd | Torque sensor |
| CN103424216A (en) * | 2012-05-25 | 2013-12-04 | 株式会社电装 | Torque sensor |
| CN103808443A (en) * | 2012-11-08 | 2014-05-21 | Lg伊诺特有限公司 | Torque measurement device |
| CN104655338A (en) * | 2013-11-18 | 2015-05-27 | 联创汽车电子有限公司 | Non-contact torque sensor magnetic circuit structure |
| CN205958165U (en) * | 2016-07-31 | 2017-02-15 | 青岛三祥高科汽车电子有限公司 | Non -contact torque sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024126A1 (en) * | 2016-07-31 | 2018-02-08 | 青岛三祥高科汽车电子有限公司 | Contactless torque sensor |
| US20220214236A1 (en) * | 2019-05-22 | 2022-07-07 | Lg Innotek Co., Ltd. | Sensing device |
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Application publication date: 20161214 |