CN105043618B - A kind of electric capacity torque sensor - Google Patents
A kind of electric capacity torque sensor Download PDFInfo
- Publication number
- CN105043618B CN105043618B CN201510487945.5A CN201510487945A CN105043618B CN 105043618 B CN105043618 B CN 105043618B CN 201510487945 A CN201510487945 A CN 201510487945A CN 105043618 B CN105043618 B CN 105043618B
- Authority
- CN
- China
- Prior art keywords
- level
- driven
- active level
- active
- metal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention belongs to torque sensor field there is provided a kind of electric capacity torque sensor, including active level, driven level, capacitance information Acquisition Circuit, T active level metal tine and two active level metal rings are disposed with the active level side surface being connected with driving shaft；T/2 driven level metal tines and a driven level metal ring are disposed with the side surface for the driven level being connected with driven shaft；The cylindrical center of active level and driven level is coaxial and can relatively rotate between the two, the active level part is included inside driven level or driven level part is included inside active level so that the active level metal tine in the active level is overlapping with the driven level metal tine of driven level relative；The active level outside driven level with being cased with cylindrical capacitive information acquisition circuit.Electric capacity torque sensor of the present invention is simple in construction, simple installation, and technique is simple, and precision is high, and long lifespan is cheap, and reliability is high, electric capacity torque sensor applied widely.
Description
Technical field
The invention belongs to torque sensor field, and in particular to be converted into the change of capacitance to examine according to the change of torque
Measure the electric capacity torque sensor of moment information.
Background technology
Torque sensor can be divided into contact and contactless two kinds.Contact has resistance-strain chip and a potentiometer type
Torque sensor etc., contactless has reluctance type, photo-electric, condenser type, magneto-electric torque sensor etc..
Resistance potentiometer, it is to be changed by the way of Mechanical Contact to touch the current potential of potential point.Due to current potential
Device, annulus and fixed wall constantly rub, and potentiometer, annulus can all produce abrasion, greatly reduce the service life of sensor.
Photoelectric torque sensor, its principle is exactly that the change of luminous flux is converted into the change of electrical signal intensity, theoretical
Basis is exactly the photoelectric effect of electrooptical device.Because such sensor is higher to light sensation stability requirement, material is processed
Technological requirement is very high, there is larger limitation in environment use, in addition for the higher precise light of some parameter requests
Electric measuring instrument, cost is high, there is its economy inferior position in cost, hence in so that its resistance in terms of long-term application popularization
It is very big.
Magneto-electric torque sensor, it is based on the law of electromagnetic induction, and be otherwise known as inductosyn or electronic
Formula sensor.Such sensor is without extra electric power system, and circuit structure is simple, and power output is larger, and reliability is higher, has
Frequency response in certain limit (generally 10 arrive 1000Hz), but the size of such sensor and weight are all than larger.
Electric capacity torque sensor, Chinese patent CN102636193A, discloses duplex differential capacitor sensor, the sensor
Gear piece number fix, it is simple in construction, but sensitivity is not high, and can not realize that driving shaft is tracked with driven shaft.Chinese patent
CN2929648Y, discloses capacitance type relative angle sensor, its structure too complex, and angle detection range only has 5 °
Limitation, although can realize the relative tracking rotary between driving shaft and driven shaft, but after tracking variable capacitance electric capacity
Amount changes, it is impossible to which variable capacitance returns to original state after realizing tracking as the present invention.United States Patent (USP)
US6955097B1, disclose move radially in formula electric capacity torque sensor, differential capacitance information processing with principle of the invention class
Seemingly, it is but entirely different in mechanical structure, and without the equally driven level of the image of Buddha present invention and active level tracking rotary.
The content of the invention
It is an object of the invention to for above-mentioned problem, there is provided a kind of simple in construction, simple installation, technique letter
Single, precision is high, and long lifespan is cheap, and reliability is high, electric capacity torque sensor applied widely.
The technical scheme is that：A kind of electric capacity torque sensor, including the collection of active level, driven level, capacitance information
Circuit, it is characterised in that the cylindrical structural being connected centered on the active level with driving shaft, the cloth on the side surface of active level
T active level metal tine is equipped with, T is >=2 integer, and active level metal tine is uniformly distributed in using active level center as the center of circle
Side surface on；There also is provided two active level metal rings on the side surface of active level, two active level metal rings it
Between be provided with space, be not attached to each other；On the side surface of active level adjacent active level metal tine respectively with two active levels
Metal ring is connected, and forms the structure that active level metal tine separately is connected with same active level metal ring；With from
T/2 driven level metal tines are disposed with the side surface of the connected driven level of moving axis, driven level metal tine is uniformly distributed in
On using driven level center as the side surface in the center of circle；A driven level metal ring, institute are there also is provided on the side surface of driven level
There is driven level metal tine to be connected with the driven level metal ring；The cylindrical center of active level and driven level it is coaxial and
It can relatively rotate between the two, the active level part is included inside driven level or driven level part is included in active level
Portion so that the active level metal tine in the active level is overlapping with the driven level metal tine of driven level relative；The active
Level outside driven level with being cased with cylindrical capacitive information acquisition circuit, the capacitance information Acquisition Circuit and active level, driven level
Cylindrical center is coaxial, and active level can be rotated with driven level relative to capacitance information Acquisition Circuit；The capacitance information is adopted
Three metal rings are disposed with above collector, respectively with the two active level metal rings and driven level in active level from
Dynamic level metal ring is corresponding, and three metal rings can be drawn out to change-over circuit by wire, by control circuit with
Motor is connected, and drives driven level to rotate by motor.
As a result of said structure, active level is in cylindrical structural, is connected with driving shaft at the center of cylinder, works as control
When driving shaft processed is rotated, active level concomitant rotation can be made, more than 2 whole is disposed with the side surface of cylindrical active level
Several active level metal tines, active level metal tine is uniformly distributed on using active level center as the side surface in the center of circle so that
Metal tine is equal apart from active level center, and two disjunct active level round metals are there also is provided on the side surface of active level
Ring, adjacent active level metal tine is connected with different active level metal rings, active level metal tine separately with together
One active level metal ring is connected, when cylindrical pivot, and active level metal tine can be with master with active level metal ring
Rotated centered on moving axis；The driven level is the cylindrical structural coaxial with active level, inorganic between active level and driven level
Tool is contacted, and can be relatively rotated between active level and driven level, the driven level can be connected with driven shaft and the driven level by
Its rotation of motor control, the driven level of the cylindrical structural, its side surface is by multiple driven level metal tines and a driven level
Metal ring is constituted, wherein the number of driven level metal tine is T/2, the metal tine is uniformly distributed in driven level center
For on the side surface in the center of circle, and driven level metal tine is connected with driven level metal ring, the metal in the active level
Gear piece is relative with the metal tine in driven level, and active level metal tine quantity and driven level metal tine quantity are 2:1 pass
System, driven level metal tine is inside and outside corresponding structure with active level metal tine, adjacent active grade metal tine from it is different
Active level metal ring be connected, active separately level metal tine is connected with same active grade metal ring, such phase
Two variable capacitances are formd between adjacent active level metal tine group and driven level metal tine group, driven level metal tine is filled
When the function of public pole plate, active level metal tine group separately act as two other pole plate of two variable capacitances,
So active level, which rotates one week (if driven level is motionless) two variable capacitance, to make the linear change in cycle, metal tine
Quantity is more, and resulting period of change is more, so that the precision to Torque test is higher, in order to receive two variable capacitances
Change, be cased with arranging above cylindrical capacitive information acquisition circuit, capacitance information Acquisition Circuit outside active level and driven level
There are three metal rings, the two of which metal ring electricity for forming two fixed sizes corresponding with active level metal ring position
Hold, the variable quantity of electric charge has reflected the capacitance variations on two variable capacitances noted earlier, electricity on the two electric capacity fixed
Hold another metal ring also formation fixed size electric capacity corresponding with driven level metal ring position on information acquisition circuit,
The variable quantity of electric charge has reflected the electric charge on the public pole plate of two variable capacitances noted earlier on the electric capacity of the fixed size
Variable quantity, is changed the capacitance-voltage that these three metal rings in capacitance information Acquisition Circuit are connected to outside by wire
Circuit, it is possible to which the capacitance variations on two variable capacitances are converted into corresponding electric signal.The capacitance information Acquisition Circuit with
Active level, driven level without any Mechanical Contact, the capacitance information Acquisition Circuit be it is fixed, therefore active level with from
Motivation can be rotated relative to capacitance information Acquisition Circuit, when active level turns an angle, between active level and driven level
Two variable capacitances can all change, and phase can also occur for the quantity of electric charge on three in capacitance information Acquisition Circuit metal ring
The change answered, corresponding change in electric is converted into by capacitance-voltage change-over circuit, then by controlling circuit start motor to turn
Dynamic, the motor can drive driven level to be rotated with active level, and the mechanical angle between such active level and driven level returns to initial value,
Two variable capacitances return to initial capacitance, it is achieved thereby that the tracking of mechanical rotating shaft.The electric capacity torque sensor of the present invention,
Moment information is obtained using the change of electric capacity, staggeredly connected active level metal tine is provided with active level, driven
One group of corresponding driven level metal tine is provided with level, two variable capacitances are formd, when occurring mechanical rotation, two
Individual variable capacitance changes therewith；Active level is used to be connected with metal tine with being provided with metal ring in driven level, sensor
Access after change-over circuit, the charge variation amount in metal tine just reflects the capacitance change of two variable capacitances；Electric capacity
Information acquisition circuit, by setting the formation corresponding with the metal ring in active level and driven level of three metal rings thereon
Three fixed capacities, for collecting the capacitance variations of two variable capacitances noted earlier, electricity is gathered by wire by capacitance information
Three metal rings on road are connected on the change-over circuit of outside, capacitance variation information just are converted into electric signal, then pass through
Processing of circuit is controlled, and sends instruction, controlled motor is rotated, and drives driven level to follow rotation, between such active level and driven level
Mechanical angle return to initial value, two variable capacitances return to initial capacitance value, it is achieved thereby that the tracking of mechanical rotating shaft.The electricity
Hold torque sensor and be widely used in mechanical industry field, in addition to the electric boosting steering system of automobile, be also applied to it
He is needed in the mechanical system of perception torque.The electric capacity torque sensor of the present invention, metal tine can use good copper sheet
Make, it is also contemplated that other metal materials of electric conductivity height, can add the high medium of dielectric constant between electric capacity and electric capacity
Size for increasing electric capacity；Directly capacitance-voltage change-over circuit can also be integrated in capacitance information Acquisition Circuit, so
The interference of outside can be reduced.
The electric capacity torque sensor of the present invention, active level include active level cylinder, T active level metal tine and
Two active level metal rings, T is >=2 integer；The active level cylinder is connected with driving shaft, the active level cylinder
Side surface on arrangement active level metal tine and active level metal ring, active level metal tine is uniformly distributed in active level
Center is on the side surface in the center of circle, adjacent active level metal tine is connected with two active level metal rings respectively, separately
Active level metal tine and same active a grade metal ring be connected, pass through gapping interval between two metal rings.
As a result of said structure, the arcuation rectangle for being shaped as being close to periphery of metal tine herein
Structure.The interval between metal tine and gear piece in active level is identical structure, and size is identical so that arcuation is long
Square gear piece is arranged in order with arcuation rectangle interval, so that gear piece is uniformly distributed in active level cylinder successively with interval
Body center is on the side surface in the center of circle, gear piece is arranged in order with interval and ultimately forms the domain.Accordingly, the tooth of driven level now
Piece is also configured as being close to the rectangle structure of the arcuation of driven level periphery, the gear piece of active level and the gear piece of driven level
It is inside and outside corresponding position relationship.
Metal tine in the electric capacity torque sensor of the present invention, active level is not limited to arcuation rectangle structure and is also not necessarily limited to
It is uniformly distributed on the side surface of cylinder, or fan-like pattern metal tine even structure is distributed in active level and driven level
On the cylinder bottom surface of corresponding active level, the interval between metal tine now and gear piece is size identical covering of the fan
Shape structure.
As a result of said structure, the interval between metal tine and gear piece on active level cylinder bottom surface is
Fan-like pattern structure, and structure is identical, size is identical so that fan-like pattern gear piece is arranged in order with fan-like pattern interval, so that tooth
Piece with interval be sequentially distributed on using cylinder bottom center as the circumference in the center of circle, gear piece be arranged in order with interval ultimately form it is whole
Ring.Accordingly, the gear piece of driven level now is also configured as the fan-like pattern structure being close on the cylinder bottom surface of driven level, main
The gear piece and the gear piece of driven level of dynamic level are the corresponding position relationships in left and right.
The electric capacity torque sensor of the present invention, metal tine is divided into two groups, and adjacent metal tine belongs to different groups,
One of which metal tine is connected with a metal ring, and another group of metal tine is connected with another metal ring.
As a result of said structure, the connection between metal tine and metal ring can use tiny bonding jumper phase
Even；The bonding jumper being connected between two metal rings and different groups of metal tines is staggered using different cabling modes；So as to protect
Two beckets of card are independent of each other.
Coaxially it is connected with driving shaft inside the electric capacity torque sensor of the present invention, the cylinder of active level, so that when actively
When axle turns an angle, the cylinder in active level can also drive metal tine, metal ring to make turning for respective angles
It is dynamic.
The present invention electric capacity torque sensor, the driven level include driven level cylinder, driven level metal tine and from
Dynamic level metal ring, driven level cylinder is connected with driven shaft, and T/2 driven level gold are disposed with the side surface of the driven level
Belong to gear piece, metal tine is uniformly distributed on using driven level its center as the side surface in the center of circle, the gold in all driven levels
Category gear piece is connected with the metal ring in driven level.
As a result of said structure, be provided with T/2 driven level metal tines in the driven level, the position of gear piece and
Shape is position and shape according to active level metal tine come relative set.Driven level metal tine and active level metal-toothed
The quantity of piece is 1:2 relation.Driven level metal tine is the rectangle structure for the arcuation for being close to driven level periphery
When, the shape of the metal tine of active level is also configured as being close to the rectangle structure of the arcuation of periphery, active level
Gear piece is inside and outside corresponding position relationship with the gear piece of driven level, now the gear piece of the gear piece of driven level and active level along circle
The length in column axis direction is identical, and the angle of bend of camber line is 2:1 relation.
Metal tine in the electric capacity torque sensor of the present invention, driven level is not limited to arcuation rectangle structure and is also not necessarily limited to
It is uniformly distributed on the side surface of cylinder, or fan-like pattern metal tine even structure is distributed in driven level and active level
On the cylinder bottom surface of corresponding driven level, the interval between metal tine now and gear piece is size identical covering of the fan
Shape structure.
As a result of said structure, the gear piece of driven level is the fan-like pattern knot being close on the cylinder bottom surface of driven level
During structure, the interval between metal tine and gear piece on active level cylinder bottom surface is also provided with being fan-like pattern structure, actively
Gear piece and the gear piece of driven level of level are the corresponding position relationships in left and right, now the fan of the gear piece of driven level and the gear piece of active level
Face shape radius is identical, and covering of the fan angle is 2:1 relation.
The electric capacity torque sensor of the present invention, metal tine in driven level directly with the metal ring phase in driven level
Even.Connection between metal tine and metal ring can be connected with tiny bonding jumper.
The electric capacity torque sensor of the present invention, the driven level is the cylindrical structural coaxial with active level.
As a result of said structure, there is multiple combinations mode between active level and driven level, two kinds are enumerated here can be with
The mode of combination：The first is that the bottom surface radius of the cylindrical structural of driven level is slightly less than active level, makes driven level metal tine
It is wrapped in active level metal tine and completely overlapped relative, i.e., driven level part is included in active level；Second is driven level
The bottom surface radius of cylindrical structural is slightly larger than active level, makes driven level metal tine that active level metal tine bag is in the inner and complete
Full weight is folded relative, i.e., active level part is included in driven level., should be equal between active level and driven level in all package assemblies
Without can be relatively rotated between Mechanical Contact, and active level and driven level.
2 active level metal rings, 12 are provided with the electric capacity torque sensor of the present invention, the cylinder of the active level
Individual active level metal tine, wherein 6 non-conterminous active level metal tines are divided into one group, with an active level metal ring phase
Even, 6 active level metal tines in addition are divided into another group, are connected with another active level metal ring；The driven level
Be provided with 1 driven level metal ring on cylinder, 6 driven level metal tines, this 6 driven level metal tines all and this
Individual driven level metal ring is connected.
As a result of said structure, metal tine in active level is that arcuation is rectangular with the metal tine in driven level
During shape structure, the gear piece of active level is inside and outside corresponding position relationship with the gear piece of driven level, now the gear piece of driven level and master
The length along cylinder axis direction of the gear piece of dynamic level is identical, and camber line is respectively with respect to the angle of bend of its center
60 ° and 30 °.Two variable capacitances are formd in active level between adjacent metal tine group and the metal tine group of driven level,
The metal tine group that metal tine in driven level act as in the function of public pole plate, active level separately act as two can
Become two other pole plate of electric capacity.The rate of change absolute value and excursion of two variable capacitances formed are identical
, so when active level is rotated relative to driven level, the capacitances of two variable capacitances can present one increase another must
Surely the variation tendency reduced, and be all linear change.Active level is used for and corresponding gold with the metal ring in driven level
Belong to gear piece to be connected, the charge variation amount on metal ring just reflects the capacitance change of two variable capacitances.
The electric capacity torque sensor of the present invention, the capacitance information Acquisition Circuit includes cylinder and three metal rings,
Three metal rings are close on cylinder, and capacitance information Acquisition Circuit cylinder be cylinder ring, by active level with it is driven
Level is included inside it, has 2 metal rings corresponding with 2 active level metal rings in active level in 3 metal rings, separately
Outer 1 metal ring is corresponding with the driven level metal ring in driven level.
As a result of said structure, the cylinder in capacitance information Acquisition Circuit is fixed on non-conductive support, actively
Level can rotate with driven level relative to capacitance information Acquisition Circuit, not have any Mechanical Contact between three.Electric capacity is believed
Cease 2 metal rings electricity for forming 2 fixed sizes corresponding with the metal ring position in active level above Acquisition Circuit
Hold, the variable quantity of electric charge has reflected the capacitance variations on 2 variable capacitances noted earlier, electric capacity on this 2 fixed electric capacity
Other 1 metal ring also formation fixed size electricity corresponding with the metal ring position in driven level on information acquisition circuit
Hold, the variable quantity of electric charge has reflected the charge variation amount on the public pole plate of 2 variable capacitances on the electric capacity of the fixed size.
In order to reduce interference of the external environment for variable capacitance, capacitance-voltage change-over circuit can be integrated into capacitance information collection
On the cylinder of circuit.
As a result of said structure, three metal rings in capacitance information Acquisition Circuit pass through wire and the electricity of outside
Appearance-potential circuit is connected, and capacitance variation information just is converted into electric signal, then by controlling processing of circuit, and sending to refer to
Order, controlled motor is rotated, and drives driven level to follow rotation, the mechanical angle between such active level and driven level returns to initial value,
Two variable capacitances return to initial capacitance value, it is achieved thereby that the tracking of mechanical rotating shaft.Therefore electric capacity torque sensor, structure letter
Single, reliability is high, and long lifespan, product cost is low.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the structural representation of active level in the present invention；
Fig. 2 is the structural representation of driven level in the present invention；
Fig. 3 is the structural representation of capacitance information Acquisition Circuit in the present invention；
Fig. 4 is the structural representation of active level, driven level and the part of capacitance information Acquisition Circuit three in the present invention；
Fig. 5 is the structural representation of electric capacity torque sensor in the present invention；
Fig. 6 is the right side view of active level in the present invention；
Fig. 7 is the right side view of driven level in the present invention；
Fig. 8 is capacitance information Acquisition Circuit right side view in the present invention；
Fig. 9 is the variable capacitance schematic diagram of electric capacity torque sensor in the present invention；
Figure 10 is that electric capacity torque sensor is linked into the circuit structure signal after capacitance-voltage change-over circuit in the present invention
Figure；
Figure 11 is the system block diagram for accessing closed loop feedback system in circuit of electric capacity torque sensor in the present invention；
Figure 12 is electric capacity torque sensor structural representation in the embodiment of the present invention 1；
Figure 13 is electric capacity torque sensor structural representation in the embodiment of the present invention 2；
Marked in figure：1 is active level, and 1-1 is active level cylinder, and 1-2 is active level metal tine, based on 1-3,1-4
Dynamic level metal ring, 2 be driven level, and 2-1 is driven level cylinder, and 2-2 is driven level metal tine, and 2-3 is driven level metal
Annulus, 3 be capacitance information Acquisition Circuit, and 3-1 is hollow cylinder, and 3-2,3-3,3-4 are metal ring.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step outside, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), except non-specifically is chatted
State, can alternative features equivalent by other or with similar purpose replaced.I.e., unless specifically stated otherwise, each feature
It is an example in a series of equivalent or similar characteristics.
Embodiment 1
As shown in Figures 1 to 12, electric capacity torque sensor of the invention, including active level 1, driven level 2, capacitance information are adopted
Collector 3, wherein：
The active level 1 includes active level cylinder 1-1, is used for and driving shaft phase inside active level cylinder 1-1
Even；It is >=2 integer that T active level metal tine 1-2, wherein T are disposed with the active level cylinder 1-1 side surfaces, this
Active level metal tine 1-2 is used for 12, namely T=12 in example, can be selected according to actual needs certainly in the integer of T >=2
Arbitrary Digit；Active level metal tine 1-2 is arcuation rectangle structure, as viewed from active level cylinder 1-1 bottom surface, active level
The radian that metal tine 1-2 is formed with the bottom surface center of circle is 15 °, and active level metal tine 1-2 is uniformly distributed in in active level
The heart is on the side surface in the center of circle.2 active level metal ring 1-3 and 1-4, T masters are disposed with the active level cylinder 1-1
Adjacent metal tine connects different active level metal ring 1- with tiny metallic conductor respectively in dynamic level metal tine 1-2
3 and 1-4, result in formation of the structure that active level metal tine 1-2 is cross-linked active level metal ring 1-3 and 1-4；In order to add
Work is convenient, can be by way of covering copper by active level metal ring 1-3,1-4 and active level metal tine 1-2 and metal company
Line is overlying on active level cylinder 1-1.
Driven level 2 includes being used to be connected with driven shaft inside driven level cylinder 2-1, driven level cylinder 2-1；Driven level
Cylinder 2-1 and the active level cylinder 1-1 of active level central axis coincide；T/2 is disposed with driven level cylinder 2-1
Individual driven level metal tine 2-2, namely 6 driven level metal tine 2-2；Driven level metal tine 2-2 is also arcuation rectangle
Structure, as viewed from driven level cylinder 2-1 bottom surface, the radian that driven level metal tine 2-2 is formed with the bottom surface center of circle is
30°；Active in the length of axis directions of the driven level metal tine 2-2 along driven level cylinder 2-1, with above-mentioned active level
Length of the level metal tine 1-2 along active level cylinder 1-1 axis directions is the same；Driven level metal tine 2-2 is uniformly distributed
On using driven level center as the side surface in the center of circle；1 driven level metal ring 2- is disposed with the driven level cylinder 2-1
3,6 driven level metal tine 2-2 are connected with tiny plain conductor with driven level metal ring 2-3；Process for convenience, together
Sample can also by way of covering copper by driven level metal ring 2-3, driven level metal tine 2-2 and metal connecting line be overlying on from
On dynamic level cylinder 2-1.
The driven level metal tine 2-2 of the driven level 2 is located inside active level hollow cylinder 1-2, as shown in figure 12.
Structure relative inside and outside gear piece will be formed between driven level metal tine 2-2 and active level metal tine 1-2.In driven level
There is no Mechanical Contact between active level, can be rotated with confronting coaxial.Due to the adjacent two panels gear pieces of active level metal tine 1-2
The packet for belonging to different connects active level metal ring 1-3,1-4, active level metal tine 1-2 and driven level metal tine respectively
Two variable capacitances C1 and C2 can be formed between 2-2, as shown in figure 9, the public extremely driven level metal of the two variable capacitances
Gear piece 2-2, two poles in addition are respectively two above-mentioned different gear piece groups of active level metal tine 1-2.Active level is relative
When driven level rotates, two variable capacitances C1 and C2 of formation capacitance are to increase another with one in change
The trend linear change that must reduce.Active level metal tine 1-2 adjacent gear piece and active level metal ring 1-3,1-4 phase
Even, driven level metal tine 2-2 is connected with driven level metal ring 2-3, so it in electric capacity torque sensor access circuit
Afterwards, two variable capacitances C1 and C2 capacitance change can be converted into the electric charge on active level metal ring 1-3,1-4,2-3
Variable quantity.
The capacitance information Acquisition Circuit 3 includes hollow cylinder 3-1 and metal ring 3-2,3-3,3-4, hollow cylinder
Body 3-1 is fixed on non-conductor support, active level cylinder 1-1, driven level cylinder 2-1, hollow cylinder 3-1 central shaft
Line is overlapped；Active level 1, driven level 2 are located at the inside of capacitance information Acquisition Circuit 3 and can relatively rotated, and do not have between three
Any Mechanical Contact.Metal ring 3-2 formation fixed capacity C3s, metal ring 3-3 corresponding with active level metal ring 1-3
Formation fixed capacity C4, metal ring 3-4 corresponding with metal ring 1-4 are corresponding with driven level metal ring 2-3 to form solid
The capacitance for determining electric capacity C5, three fixed capacities C3, C4, C5 is much larger than variable capacitance C1 and C2 capacitance.
Metal ring 3-2,3-3 and 3-4 in capacitance information Acquisition Circuit change electricity with capacitance-voltage respectively by wire
Road is connected, and equivalent circuit is as shown in Figure 10.In Figure 10,3 points of a, b, d is respectively by metal ring 3-2,3-3,3-4 wire
The potential point of extraction.Because electric capacity C3, C4, C5 are very big relative to variable capacitance C1, C2 capacitance, so similar to short circuit,
That is, 2 points of a, b electrical potential difference can directly reflect variable capacitance C1 and C2 change in capacitance-voltage change-over circuit
Change.During original state, the relative area one between driven level metal tine 2-2 and active level metal tine 1-2 adjacent gear piece
Sample is big, then electric capacity C1 and electric capacity C2's equal in magnitude, i.e. C1=C2,2 points of a, b in now equivalent capacitance-voltage change-over circuit
The electrical potential difference at place is 0, and no electric current passes through.Driving shaft relative to driven shaft turn an angle θ when, in electric capacity C1 and C2 wherein
The circuit structure of one increase, another reduction, that is, a difference, it is assumed here that C1 is increased to C1+ △ C, and C2 is reduced to
C2- △ C, now electric bridge is uneven in bridge circuit, and the potential of a points can be less than the potential of b points, and electric current can flow to a points from b points,
And the amplitude size of 2 points of a, b electrical potential difference also reflects electric capacity C1 and electric capacity C2 variable quantity △ C.So, moment information
The variable quantity △ C of variable capacitance are converted to by electric capacity torque sensor, are then turned again by the capacitance-voltage shown in Figure 10
Change the electrical potential difference that △ C are converted into 2 points of a, b by circuit.As shown in figure 11,2 points of a, b electrical potential difference passes through differential amplification, filter again
It is input to after ripple device, phase sensitive detection, A/D samplings in control chip, control chip is carried out after a series of processing, and transmission refers to
Make controlled motor rotate, drive driven level to follow active level to rotate corresponding angle, θ, the machinery between such active level and driven level
Angle returns to initial value, and two variable capacitances return to initial capacitance value C1 and C2, and electric bridge restores balance state, 2 points of a, b again
Between electrical potential difference revert to zero.Material is thus formed the tracking rotary of driven level and active level, and it is tracking zero point all the time,
Such design causes the detection of angle is more accurate more to stablize.
Embodiment 2
Embodiment 2 is similar to Example 1, as shown in figure 13, and its difference is：It is main in active level 1 in the present embodiment
Dynamic level cylinder 1-1 is located inside the driven level cylinder 2-1 of driven level 2, in driven level metal tine 2-2 and active level metal
Structure relative inside and outside gear piece will be formed between gear piece 1-2；Active level active level metal tine 1-2 quantity is 14 in this example
Piece, i.e. T=14, can be selected as the Arbitrary Digit in the integer of T >=2 according to actual needs certainly, the more detection torques of gear piece number
Precision is higher, accordingly, and the driven driven level metal tine 2-2 of level quantity is T/2 pieces, i.e., 7 piece in this example.
In this example, active level metal tine 1-2 is arcuation rectangle structure, and is uniformly distributed in using active level center as circle
On the side surface of the heart, driven level metal tine 2-2 also be arcuation rectangle structure, and be uniformly distributed in using driven level center as
On the side surface in the center of circle.Active level metal tine 1-2 is cross-linked active level metal ring 1-3 and 1-4, driven level in active level
The upper driven driven level metal ring 2-3 of level metal tine 2-2 connections, driven level metal tine 2-2 are along driven level cylinder 2-1
Axis direction length, with the active level metal tine 1-2 in above-mentioned active level along active level cylinder 1-1 axis directions
Length it is the same.Capacitance information Acquisition Circuit 3 includes hollow cylinder 3-1 and metal ring 3-2,3-3,3-4, hollow cylinder
3-1 is fixed on non-conductor support, and active level cylinder 1-1,2-1,3-1 central axis are overlapped.Active level 1, driven level 2
It in the inside of capacitance information Acquisition Circuit 3 and can relatively rotate, there is no any Mechanical Contact between three.
According to above-described embodiment 2, electric capacity torque sensor of the invention, its basic equivalent circuit diagram with embodiment 1
Equivalent circuit Figure 10 it is the same, equivalent closed loop feedback system block diagram is as the equivalent system block diagram 11 in embodiment 1, its base
This operation principle is also in the same manner as in Example 1.
The electric capacity torque sensor of the present invention, is widely used in mechanical industry field, except the electric power steering of automobile
Outside system, be also applied to it is other need perceive torque mechanical system in.
The electric capacity torque sensor of the present invention, cheap, simple in construction, easy for installation, technique is simple, and precision is high, the longevity
Life length, stability is high.The material of metal tine can select cheap copper with good conductivity, and other can also be selected conductive
Property good metal, for the ease of processing, can using copper is covered by the way of by metal tine and becket be overlying on cylindrical structural it
On；Capacitance information Acquisition Circuit is directly fixed with non-conductive support, so can the convenient number of winning the confidence, be connected to electric capacity-electricity
Voltage conversion circuit, in order to reduce the extraneous interference for electric capacity torque sensor, can even control capacitance-voltage change-over circuit
Circuit processed is integrated into capacitance information Acquisition Circuit together；A shielding case can also be put outside capacitance information Acquisition Circuit, this
Sample make it that the measurement of electric capacity torque sensor is more accurate；Using the structure of difference, influence of the environment to electric capacity can be eliminated, reliably
Property is very high；The high medium of dielectric constant can be added between fixed capacity C3, C4, C5 according to actual conditions, capacitance, choosing is improved
Select more flexible.Change-over circuit is extremely simple with process circuit, so that whole system is cheap, stability is high.
The invention is not limited in foregoing embodiment.The present invention, which is expanded to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (3)
1. a kind of electric capacity torque sensor, including active level, driven level, capacitance information Acquisition Circuit, it is characterised in that the master
The cylindrical structural being connected centered on dynamic level with driving shaft, is disposed with T active level metal tine on the side surface of active level,
T is >=2 integer, and active level metal tine is uniformly distributed on using active level center as the side surface in the center of circle；In active level
It there also is provided on side surface and be provided with gapping interval between two active level metal rings, two active level metal rings；Actively
Adjacent active level metal tine on the side surface of level is connected with two active level metal rings respectively, forms active separately
The structure that level metal tine is connected with same active level metal ring；The driven level is the cylinder knot being connected with driven shaft
T/2 driven level metal tines are disposed with structure, the side surface of driven level, driven level metal tine is uniformly distributed in driven level
Center is on the side surface in the center of circle；A driven level metal ring, all driven levels are there also is provided on the side surface of driven level
Metal tine is connected with the driven level metal ring；The cylindrical center of active level and driven level is coaxially and between the two
It can relatively rotate, active level part is included inside driven level or driven level part is included inside active level so that the master
Dynamic level metal tine is overlapping with driven level metal tine relative；The active level is adopted with being cased with cylindrical capacitive information outside driven level
Collector, the cylindrical center of the capacitance information Acquisition Circuit and active level, driven level is coaxial, active level and the equal energy of driven level
It is enough to be rotated relative to capacitance information Acquisition Circuit；Three metal rings are disposed with the capacitance information Acquisition Circuit side surface,
Corresponding with two active level metal rings and driven level metal ring respectively to set, three metal rings can be by leading
Line is drawn out to change-over circuit, by controlling circuit to be connected with motor, and drives driven level to rotate by motor.
2. the electric capacity torque sensor as described in claim 1, it is characterised in that the active level metal tine is shaped as arcuation
Rectangle structure, between active level metal tine and gear piece at intervals of identical structure, and size is identical, active level metal-toothed
Piece is arranged in order with interval and ultimately forms the domain；The driven level metal tine shape is also arcuation rectangle structure, its position
With active level metal tine relative set.
3. the electric capacity torque sensor as described in claim 2, it is characterised in that the active level metal tine and driven level metal
Gear piece is identical along its axis direction length, and the angle of bend of camber line is 1:2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510487945.5A CN105043618B (en) | 2015-08-11 | 2015-08-11 | A kind of electric capacity torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510487945.5A CN105043618B (en) | 2015-08-11 | 2015-08-11 | A kind of electric capacity torque sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105043618A CN105043618A (en) | 2015-11-11 |
| CN105043618B true CN105043618B (en) | 2017-08-08 |
Family
ID=54450338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510487945.5A Expired - Fee Related CN105043618B (en) | 2015-08-11 | 2015-08-11 | A kind of electric capacity torque sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105043618B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389000B (en) * | 2019-06-05 | 2020-11-24 | 中国地质大学（武汉） | Turbine drilling tool torque measurement sensor based on distributed capacitance principle |
| CN115032786A (en) * | 2022-06-27 | 2022-09-09 | 湖北三江航天万峰科技发展有限公司 | Control system and control method for improving torsion control precision of micro-vibrating mirror |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1090390A (en) * | 1993-01-13 | 1994-08-03 | 北京峰光科技开发公司 | Capacitor torque sensor |
| KR100702919B1 (en) * | 1999-06-21 | 2007-04-03 | 후루카와 덴키 고교 가부시키가이샤 | Rotary sensor and measurement circuit thereof |
| US6772646B1 (en) * | 2001-07-11 | 2004-08-10 | Bei Sensors & Systems Company, Inc. | Differential capacitive torque sensor |
| DE102004056049A1 (en) * | 2004-11-19 | 2006-06-01 | Ab Elektronik Gmbh | Sensor for use as torque sensor, has stator unit with coil circuit having flexible substrate running along sensor region, and evaluation circuit to evaluate signal received from one coil to determine value for rotary position of rotor units |
| US7237444B2 (en) * | 2005-06-29 | 2007-07-03 | Freudenberg-Nok General Partnership | Torque cell for determining a torque load on a rotary member |
| CN2929648Y (en) * | 2006-05-31 | 2007-08-01 | 林观建 | Capacitance type relative angle sensor |
| CN201344846Y (en) * | 2009-01-19 | 2009-11-11 | 中国计量学院 | Dynamic torque sensor based on capacitors |
| CN102636193A (en) * | 2012-03-30 | 2012-08-15 | 程有信 | Duplex differential capacitor sensor |
| CN103278274B (en) * | 2013-04-24 | 2015-01-14 | 中北大学 | Capacitive coupling-based rotating part torque testing device |
-
2015
- 2015-08-11 CN CN201510487945.5A patent/CN105043618B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105043618A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106796121B (en) | By when based on set bar position sensor | |
| CN103968750B (en) | Electric field type time-grating angular displacement sensor | |
| EP0182085B1 (en) | Position and speed sensors | |
| CN106643470B (en) | A kind of absolute type capacitor angle displacement measurement sensor | |
| CN102445146B (en) | Axle torsion angle and/or axle torque detecting apparatus and run the method for this device | |
| KR102444618B1 (en) | Bearing with angular movement sensor | |
| CN112444191B (en) | Inductive angle sensor | |
| EP1396703A2 (en) | Capacitive angular position sensor | |
| US8854054B2 (en) | Rotation angle sensor | |
| CN106796118A (en) | Sensor cluster for contactlessly detecting the rotational angle of rotating member | |
| CN103528605B (en) | A kind of capacitive absolute rotary encoder | |
| US5872408A (en) | Capacitive sensor for indicating position | |
| CN105765347A (en) | High resolution multi-turn sensor related devices and methods | |
| CN107202966B (en) | The measurement method and system of a kind of alternate magnetic flux leakage of transformer winding | |
| CN202648615U (en) | Magnetic encoder | |
| EP2853861B1 (en) | Position detection device | |
| CN105043618B (en) | A kind of electric capacity torque sensor | |
| CN106403806B (en) | Angular position sensor, angular position measuring system and method | |
| CN109341517A (en) | A kind of absolute type capacitive grating displacement rotating encoder | |
| CN105241480B (en) | Include the component of at least the first motor, the second motor and angular position pick up | |
| CN106052546B (en) | One kind divides valve capacitive angular sensor | |
| CN110146010B (en) | Self-driven high-precision angle measurement system and method | |
| Das et al. | Simple approach to design a capacitive rotary encoder | |
| CN103278274B (en) | Capacitive coupling-based rotating part torque testing device | |
| CN105429422A (en) | Step motor and system for driving step motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170808 Termination date: 20200811 |