CN110198103A - A kind of angular displacement sensor and method detecting brushless DC motor position - Google Patents
A kind of angular displacement sensor and method detecting brushless DC motor position Download PDFInfo
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- CN110198103A CN110198103A CN201910603374.5A CN201910603374A CN110198103A CN 110198103 A CN110198103 A CN 110198103A CN 201910603374 A CN201910603374 A CN 201910603374A CN 110198103 A CN110198103 A CN 110198103A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/225—Detecting coils
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil
Abstract
The present invention provides the angular displacement sensors and method of a kind of detection brushless DC motor position, and by installing movable plate on motor shaft and installing stationary plate on stator, the dynamic and static plate is coaxial, parallel, interval is installed；Induced potential coil and actuating coil are set on movable plate；Magnet exciting coil, X-axis receiving coil and Y-axis receiving coil are set on stationary plate.Motor rotor position angular transducer provided by the present invention does not use any semiconductor devices, works more reliable and more stable, and cost is lower, in addition present invention can be suitably applied to any load occasion, whether soft load or hard load.Due to improving rotor-position detection accuracy, error is reduced, so that can avoid motor commutation noise occurs, prevents motor from slightly shaking, motor driven can be more steady.
Description
Technical field
The present invention relates to DC brushless motor technical field, especially a kind of angle for detecting brushless DC motor position
Displacement sensor and method.
Background technique
The advantages that DC brushless motor is high-efficient, the service life is long with its is increasingly by social concerns, especially in medium and small function
In rate application, the electromechanical conversion efficiency of DC brushless motor can achieve 90%, and the efficiency of middle-size and small-size single-phase AC motor
Only 70-80%, in the case where being becoming tight energy day, DC brushless motor is by favor.
But induction alternating current (AC) motor is compared, the driving of DC brushless motor is complex, wherein crucial technology is to turn
The detection of sub- position.Its working principle of DC brushless motor and brush direct current motor are closely similar, the difference is that a bit: direct current has
The armature commutation of brush motor is to realize by mechanical brush, and the commutation of DC brushless motor is by driving semiconductor power
What the switch of device was realized.Common ground between the two are as follows: needs switch armature supply direction according to the position of rotor, also
It is to realize that the electric current of driving circuit commutates according to rotor-position.
The disadvantage of brush direct current motor is: the brush structure used that commutates is easy to wear, and leads to service life reduction,
And the powder worn is easily filled on the commutator of rotor, causes to leak electricity.And DC brushless motor is from basic
On solve this problem, therefore DC brushless motor inherits that brush direct current motor is high-efficient, torque is big and speed regulation is easy
The advantages of, while the shortcomings that brush mechanical structure is prone to wear out is avoided, have the tendency that replacing AC asynchronous motor comprehensively.
The method that DC brushless motor realizes electric current commutation is: detecting rotor-position, is then switched according to rotor-position
The current direction of excitation armature, therefore rotor-position detection is that DC brushless motor primarily solves the problems, such as.For rotor-position
Detection, conventional method has following several:
1. hall device
By installing more magnetic sensor-hall devices on motor stator, hall device can incude brush DC
The polarity of the rotor magnet of motor, then driving circuit can judge the position of rotor according to the output of more hall devices.
This method advantage is: detection accuracy is medium, reproducible, installation space occupies less, cost is relatively low.Disadvantage exists
In: hall device is affected by temperature easily damaged, the use at present under the higher stronger environment of vibration of temperature of larger, hall device
The main reason for DC brushless motor damage of Hall sensor, is the damage of hall device.
2. photoelectric coding
By installing an angle photoelectric coded disk on the axis of motor, a photoelectric reading code circuit is then fixedly mounted,
Can detecte out with the angular coding on the photoelectric coded disk of rotor synchronous rotary, so that it is determined that rotor-position.
This method advantage is: detection accuracy is high, reproducible.Disadvantage is: installation space is big, at high cost, only applicable
It is controlled in high-precision servo, is not suitable for low price application.
3. differential transformer encodes
By installing a differential transformer on motor shaft, the output of differential transformer is corresponding with rotation angle, thus
Realize rotor-position detection.
This method advantage is: detection accuracy is high, reproducible.Disadvantage is: installation space is big, at high cost, only applicable
It is controlled in high-precision servo, is not suitable for low price application.
4. circuit detecting
The moment for stopping driving using driving circuit judges to turn according to the induced potential of rotor field in the stator windings
Sub- position.
This method advantage is: it is simple, at low cost not need additional sensor, motor manufacturing technology.Disadvantage is:
The induced electromotive force of inducting that the low-speed stage rotor of motor is formed is very faint even without therefore causing in startup stage and low
The fast stage is unstable, is not suitable for hard load scenarios.
Summary of the invention
The object of the present invention is to provide a kind of angular displacement sensor and method for detecting brushless DC motor position, purports
Solving the problems, such as that there are environmental suitabilities is poor to the detection of rotor-position in the prior art, stability difference or at high cost, realization
Stability and harsh environment adaptability are improved, manufacturing cost is reduced.
To reach above-mentioned technical purpose, the present invention provides a kind of angular displacement biographies for detecting brushless DC motor position
Sensor, the sensor include:
It is installed on motor shaft and the movable plate of rotor synchronous rotary and the stationary plate being installed on stator；
The dynamic and static plate is coaxial, parallel, interval is installed；
The movable plate includes the induced potential coil and actuating coil of outer ring, the induced potential coil and actuating coil string
Connection is closed circuit, and the actuating coil is two reverse concatenated coils；
The stationary plate includes outermost magnet exciting coil, X-axis receiving coil and Y-axis receiving coil, the X-axis receiving coil
For two or so reverse concatenated coils, the Y-axis receiving coil is about two reverse concatenated coils.
Preferably, distance is 0.5mm between the dynamic and static plate.
Preferably, the movable plate is pcb board manufacture, and the coil on movable plate is etching metal wire；The stationary plate is pcb board
It manufactures, the coil on stationary plate is etching metal wire.
Preferably, not in same pcb board layer, the actuating coil is for the induced potential coil of the movable plate and actuating coil
90 degree of sector (-shaped) coils.
Preferably, the stationary plate is four layers of pcb board structure, contains magnet exciting coil and Y-axis receiving coil in two layers of pcb board,
Contain X-axis receiving coil in two layers of pcb board, the X-axis receiving coil, Y-axis receiving coil are 90 degree of sector (-shaped) coils.
Preferably, the sector (-shaped) coil area of the movable plate is less than the sector (-shaped) coil area of stationary plate, and works as movable plate sector (-shaped) coil
When Chong Die with stationary plate sector (-shaped) coil area, the sector (-shaped) coil of movable plate is by the sector (-shaped) coil all standing of stationary plate.
The present invention also provides a kind of sides using the angular displacement sensor detection brushless DC motor position
Method the described method comprises the following steps:
S1, it is passed through high-frequency alternating current to the magnet exciting coil in stationary plate, generates main field；
S2, main field act on the induced potential coil on movable plate formed induced current, induced current with induced potential
Induced current is generated in the concatenated actuating coil of coil；
Induced current different sense in formation direction in concatenated two coils in actuating coil of S3, movable plate actuating coil
Raw rotating excitation field；
The X-axis receiving coil and Y-axis receiving coil that S4, rotating excitation field of inducting act on stationary plate generate induced electromotive force；
S5, the ratio for calculating the electromotive force that X-axis receiving coil generates and the electromotive force that Y-axis receiving coil generates, are moved
Spatial position angle between piece and stationary plate, the as position angle of rotor.
Preferably, the frequency of the high-frequency alternating current is 1MHz.
Preferably, main field X-axis receiving coil, Y-axis receiving coil and active line in movable plate in stationary plate
The induced electromotive force that circle generates is cancelled out each other respectively, and exporting is 0.
Preferably, the method also includes:
The amplitude proportion for the electromotive force that the electromotive force and Y-axis receiving coil generated by detection X-axis receiving coil generates, with
And the phase relation with excitation signal, realize four-quadrant angle sensor.
The effect provided in summary of the invention is only the effect of embodiment, rather than invents all whole effects, above-mentioned
A technical solution in technical solution have the following advantages that or the utility model has the advantages that
Compared with prior art, motor rotor position angular transducer provided by the present invention does not use any semiconductor device
Part works more reliable and more stable, and conventional Hall units test or photoelectric coding position detection can all have semiconductor devices
The problem that quick aging causes electrical fault rate high under high temperature, high vibration environment, since the present invention uses pcb board technique system
Make, do not use any semiconductor devices, can significant increase DC brushless motor anti-adverse environment adaptability, and cost at
This is lower.
It present invention can be suitably applied to any load occasion, whether soft load or hard load.
Due to improving rotor-position detection accuracy, error is reduced, so that can avoid motor commutation noise occurs, is prevented
Motor slightly shakes, and motor driven can be more steady, to solve to be easy to appear fluctuation or drive using motor when hall device
The problem of efficiency of movement declines.And cost itself is low, for differential transformer detection, can effectively reduce cost, it can
For low price application.
Detailed description of the invention
Fig. 1 is the pcb board structural schematic diagram comprising actuating coil in a kind of movable plate provided in the embodiment of the present invention；
Fig. 2 is the pcb board structural representation comprising induced potential coil in a kind of movable plate provided in the embodiment of the present invention
Figure；
Fig. 3 be in a kind of stationary plate provided in the embodiment of the present invention comprising magnet exciting coil and Y-axis receiving coil wherein
One layer of pcb board structural schematic diagram；
Fig. 4 is another comprising magnet exciting coil and Y-axis receiving coil in a kind of stationary plate provided in the embodiment of the present invention
Layer pcb board structural schematic diagram；
Fig. 5 is wherein one layer of pcb board knot comprising X-axis receiving coil in a kind of stationary plate provided in the embodiment of the present invention
Structure schematic diagram；
Fig. 6 is another layer of pcb board structure comprising X-axis receiving coil in a kind of stationary plate provided in the embodiment of the present invention
Schematic diagram；
Fig. 7 is a kind of method flow diagram of detection brushless DC motor position provided in the embodiment of the present invention.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its attached drawing is combined, to this
Invention is described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
It is provided for the embodiments of the invention a kind of angle position for detecting brushless DC motor position with reference to the accompanying drawing
Displacement sensor and method are described in detail.
As shown in figures 1 to 6, the embodiment of the invention discloses a kind of angular displacement biographies for detecting brushless DC motor position
Sensor, the sensor include movable plate and stationary plate, and the movable plate is installed on motor shaft, with rotor synchronous rotary；It is described
Stationary plate is fixed on stator.Dynamic and static plate is installed in parallel, and distance between the two may be configured as 0.2-0.8mm, and preferred distance is
0.5mm。
The preferred pcb board technique manufacture of movable plate manufacturing method, is etched with metal wire, metal wire is constituted on movable plate
Electromagnetic induction coil.The electromagnetic induction coil includes outer ring and inner ring, and the outer ring symmetric part is induced potential coil, institute
Stating inner ring is actuating coil.The inner ring is in series by upper and lower two sector (-shaped) coils intersection, and upper and lower two fan-shaped angles are excellent
It is selected as 90 degree.Two sector (-shaped) coils be formed by magnetic direction for intersect series connection, if top sector generate magnetic field be to
Outer, then the fan-shaped magnetic field generated in lower section is inside, and two fan-shaped magnetic directions generated are opposite.Actuating coil two up and down
Fan-shaped layout is preferably circumferentially symmetrical arranged, and may be alternatively provided as asymmetry up and down in other embodiments, or
Deviate fan-shaped.Induced potential coil and actuating coil on movable plate are connected into a big closed circuit.
The movable plate selects pcb board technique, the advantage is that: it is at low cost, precision is high, reproducible.The movable plate in addition to
It selects outside pcb board technique, technique similar with pcb board can also be used, such as paste sheet metal on insulation board and form sensing
Required route, or route needed for conductive plastic material forms sensing is pasted on insulation board.
The preferred pcb board technique manufacture of stationary plate manufacturing method, etches the coil that 3 metal wires are constituted on stationary plate,
Including outermost magnet exciting coil, X-axis receiving coil and Y-axis receiving coil.Outermost magnet exciting coil is circular symmetry setting；
X-axis receiving coil is the two 90 degree of sector (-shaped) coils in left and right, and the coil of left and right two intersects series connection；Y-axis receiving coil is upper and lower two
90 degree of sector (-shaped) coils, upper and lower two coils intersect series connection.Since X-axis receiving coil and Y-axis receiving coil are circumferentially divided equally, because
This preferably uses four layers of pcb board technique to be manufactured, to manufacture X, Y-axis receiving coil on the different layers.In four layers of pcb board,
Contain magnet exciting coil and Y-axis receiving coil in two layers of pcb board, contains X-axis receiving coil in two layers of pcb board.
The sector (-shaped) coil area of movable plate is less than the sector (-shaped) coil area of stationary plate, and when movable plate sector (-shaped) coil and stationary plate fan-shaped line
When enclosing area overlapping, the sector (-shaped) coil of movable plate is by the sector (-shaped) coil all standing of stationary plate.
Movable plate is fixed on machine shaft, other portions that stationary plate is fixed on motor stator or is fixed in position with stator
On part, as long as therefore detect the rotation angle between dynamic and static plate, so that it may determine the position angle of rotor.Dynamic and static plate it
Between it is coaxial, parallel, therebetween without mechanical friction, it may form part of electromagnetic induction relationship.
In working sensor, high-frequency alternating current is passed through to the magnet exciting coil in stationary plate first, optimized frequency 1MHz is removed
Except this, 100KHz, 200KHz, 2MHz etc. also can be selected.High-frequency alternating current can generate alternating magnetic field in magnet exciting coil, the magnetic
Field is known as main field, and according to the law of electromagnetic induction, main field can generate induced electricity in the coil of the left and right of X-axis receiving coil two
Kinetic potential, but due to two coils be it is reverse concatenated, the induced electromotive force of main field is left and right on X-axis receiving coil
It cancels out each other, does not have output；Similarly, the main field induced electromotive force of Y-axis receiving coil is also to offset up and down, and exporting is 0.
Since movable plate is coaxial, parallel and close installation with stationary plate, main field magnetic linkage can pass through the induced electricity of movable plate
Gesture coil, since the actuating coil on movable plate is two 90 degree of sector (-shaped) coils and reverse series connection up and down, due to cancelling out each other,
Main field will not generate induced electromotive force on actuating coil.But since induced potential coil and actuating coil are serially connected
, therefore induced potential coil will form concatenated induced current, and the induced current in actuating coil can be in actuating coil
Induced magnetic field is formed on upper and lower two 90 degree of sector (-shaped) coils, the Induced magnetic field of actuating coil is by upper and lower two 90 degree of sector (-shaped) coil shapes
At up and down direction is opposite.Therefore, the induction result of movable plate are as follows: the opposite magnetic that 90 degree of sector (-shaped) coils are inducted is generated on movable plate
, and magnetic field can be rotated with movable plate, this is rotating excitation field of inducting.
Rotating excitation field of inducting is generated on movable plate due to motivating, and acts on X-axis receiving coil and Y-axis on stationary plate in turn
Receiving coil, to generate induced electromotive force.Since two rotating excitation fields of inducting are opposite direction, in X-axis receiving coil
Two coils on the induced electromotive force that generates will not cancel out each other, similarly, produced on two coils on Y-axis receiving coil
Raw induced electromotive force will not cancel out each other.Therefore, because the reverse series relationship of symmetry and coil, X-axis receiving coil
The electromotive force for rotating excitation field of inducting can only be induced with Y-axis receiving coil, and the magnetic field generated to other coils is insensitive.
Rotating excitation field of inducting is generated by two sector (-shaped) coils of the actuating coil of movable plate, and movable plate exists with rotor
It rotates, two sector (-shaped) coils and X-axis receiving coil and Y-axis receiving coil in actuating coil form covering relation, area coverage
Space angle θ between movable plate and stationary plate is directly proportional, according to the law of electromagnetic induction, the signal that X-axis receiving coil generates also with
Angle theta is directly proportional, the signal also relationship proportional to angle theta that Y-axis receiving coil generates.Therefore, pass through detection X-axis signal and Y
Axis signal, and calculate ratio between the two, so that it may obtain the spatial position angle theta between dynamic and static plate, the angle
The namely position angle of rotor.
Since the amplitude of X-axis signal and Y-axis signal is relationship proportional to rotor position angle, meanwhile, operating fields
Two sector (-shaped) coils also carry the direction relations of exciting current, that is, the direction relations in magnetic field, and operating fields and X-axis connect
There are two types of direction covering relation, both covering relations are embodied in X-axis signal and Y-axis signal and encourage for take-up circle, Y-axis receiving coil
In the phase relation of magnetic signal, therefore pass through the amplitude proportion of detection X-axis signal and Y-axis signal, and the phase with excitation signal
Position relationship is, it can be achieved that four-quadrant angle sensor.
Motor rotor position angular transducer provided by the embodiment of the present invention does not use any semiconductor devices, and work is more
Add reliable and stable, and conventional Hall units test or photoelectric coding position detection can all have semiconductor devices in high temperature, height
The problem that quick aging causes electrical fault rate high under vibration environment does not use and appoints since the present invention is manufactured using pcb board technique
What semiconductor devices, can significant increase DC brushless motor anti-adverse environment adaptability, and cost is lower.
It present invention can be suitably applied to any load occasion, whether soft load or hard load.
Due to improving rotor-position detection accuracy, error is reduced, so that can avoid motor commutation noise occurs, is prevented
Motor slightly shakes, and motor driven can be more steady, to solve to be easy to appear fluctuation or drive using motor when hall device
The problem of efficiency of movement declines.And cost itself is low, for differential transformer detection, can effectively reduce cost, it can
For low price application.
As shown in fig. 7, detecting brush DC using the angular displacement sensor the embodiment of the invention also discloses a kind of
The method of motor rotor position, the described method comprises the following steps:
S1, it is passed through high-frequency alternating current to the magnet exciting coil in stationary plate, generates main field；
S2, main field act on the induced potential coil on movable plate formed induced current, induced current with induced potential
Induced current is generated in the concatenated actuating coil of coil；
Induced current different sense in formation direction in concatenated two coils in actuating coil of S3, movable plate actuating coil
Raw rotating excitation field；
The X-axis receiving coil and Y-axis receiving coil that S4, rotating excitation field of inducting act on stationary plate generate induced electromotive force；
S5, the ratio for calculating the electromotive force that X-axis receiving coil generates and the electromotive force that Y-axis receiving coil generates, are moved
Spatial position angle between piece and stationary plate, the as position angle of rotor.
The embodiment of the present invention carries out the detection of brushless DC motor position using angular displacement sensor described previously.
High-frequency alternating current is passed through to the magnet exciting coil in stationary plate first, in addition to this optimized frequency 1MHz also can be selected
100KHz, 200KHz, 2MHz etc..High-frequency alternating current can generate alternating magnetic field in magnet exciting coil, which is known as main field, root
According to the law of electromagnetic induction, main field can generate induced electromotive force in the coil of the left and right of X-axis receiving coil two, but due to two
A coil is reverse concatenated, therefore the induced electromotive force of main field left and right on X-axis receiving coil is cancelled out each other, will not
There is output；Similarly, the main field induced electromotive force of Y-axis receiving coil is also to offset up and down, and exporting is 0.
Since movable plate is coaxial, parallel and close installation with stationary plate, main field magnetic linkage can pass through the induced electricity of movable plate
Gesture coil, since the actuating coil on movable plate is two 90 degree of sector (-shaped) coils and reverse series connection up and down, due to cancelling out each other,
Main field will not generate induced electromotive force on actuating coil.But since induced potential coil and actuating coil are serially connected
, therefore induced potential coil will form concatenated induced current, and the induced current in actuating coil can be in actuating coil
Induced magnetic field is formed on upper and lower two 90 degree of sector (-shaped) coils, the Induced magnetic field of actuating coil is by upper and lower two 90 degree of sector (-shaped) coil shapes
At up and down direction is opposite.Therefore, the induction result of movable plate are as follows: the opposite magnetic that 90 degree of sector (-shaped) coils are inducted is generated on movable plate
, and magnetic field can be rotated with movable plate, this is rotating excitation field of inducting.
Rotating excitation field of inducting is generated on movable plate due to motivating, and acts on X-axis receiving coil and Y-axis on stationary plate in turn
Receiving coil, to generate induced electromotive force.Since two rotating excitation fields of inducting are opposite direction, in X-axis receiving coil
Two coils on the induced electromotive force that generates will not cancel out each other, similarly, produced on two coils on Y-axis receiving coil
Raw induced electromotive force will not cancel out each other.Therefore, because the reverse series relationship of symmetry and coil, X-axis receiving coil
The electromotive force for rotating excitation field of inducting can only be induced with Y-axis receiving coil, and the magnetic field generated to other coils is insensitive.
Rotating excitation field of inducting is generated by two sector (-shaped) coils of the actuating coil of movable plate, and movable plate exists with rotor
It rotates, two sector (-shaped) coils and X-axis receiving coil and Y-axis receiving coil in actuating coil form covering relation, area coverage
Space angle θ between movable plate and stationary plate is directly proportional, according to the law of electromagnetic induction, the signal that X-axis receiving coil generates also with
Angle theta is directly proportional, the signal also relationship proportional to angle theta that Y-axis receiving coil generates.Therefore, pass through detection X-axis signal and Y
Axis signal, and calculate ratio between the two, so that it may obtain the spatial position angle theta between dynamic and static plate, the angle
The namely position angle of rotor.
Since the amplitude of X-axis signal and Y-axis signal is relationship proportional to rotor position angle, meanwhile, operating fields
Two sector (-shaped) coils also carry the direction relations of exciting current, that is, the direction relations in magnetic field, and operating fields and X-axis connect
There are two types of direction covering relation, both covering relations are embodied in X-axis signal and Y-axis signal and encourage for take-up circle, Y-axis receiving coil
In the phase relation of magnetic signal, therefore pass through the amplitude proportion of detection X-axis signal and Y-axis signal, and the phase with excitation signal
Position relationship is, it can be achieved that four-quadrant angle sensor.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of angular displacement sensor for detecting brushless DC motor position, which is characterized in that the sensor includes:
It is installed on motor shaft and the movable plate of rotor synchronous rotary and the stationary plate being installed on stator；
The dynamic and static plate is coaxial, parallel, interval is installed；
The movable plate includes the induced potential coil and actuating coil of outer ring, and the induced potential coil is connected with actuating coil is
Closed circuit, the actuating coil are two reverse concatenated coils；
The stationary plate includes outermost magnet exciting coil, X-axis receiving coil and Y-axis receiving coil, and the X-axis receiving coil is two
A or so reverse concatenated coil, the Y-axis receiving coil are about two reverse concatenated coils.
2. a kind of angular displacement sensor for detecting brushless DC motor position according to claim 1, feature exist
In distance is 0.5mm between the dynamic and static plate.
3. a kind of angular displacement sensor for detecting brushless DC motor position according to claim 1, feature exist
In the movable plate is pcb board manufacture, and the coil on movable plate is etching metal wire；The stationary plate is that pcb board manufactures, on stationary plate
Coil be etching metal wire.
4. a kind of angular displacement sensor for detecting brushless DC motor position according to claim 3, feature exist
In for the induced potential coil and actuating coil of the movable plate not in same pcb board layer, the actuating coil is 90 degree of fan-shaped lines
Circle.
5. a kind of angular displacement sensor for detecting brushless DC motor position according to claim 4, feature exist
In the stationary plate is four layers of pcb board structure, and magnet exciting coil and Y-axis receiving coil are contained in two layers of pcb board, is contained in two layers of pcb board
There is X-axis receiving coil, the X-axis receiving coil, Y-axis receiving coil are 90 degree of sector (-shaped) coils.
6. a kind of angular displacement sensor for detecting brushless DC motor position according to claim 5, feature exist
In the sector (-shaped) coil area of the movable plate is less than the sector (-shaped) coil area of stationary plate, and when movable plate sector (-shaped) coil and stationary plate fan-shaped line
When enclosing area overlapping, the sector (-shaped) coil of movable plate is by the sector (-shaped) coil all standing of stationary plate.
7. a kind of detect brushless DC motor position using the angular displacement sensor as claimed in any one of claims 1 to 6
Method, which is characterized in that the described method comprises the following steps:
S1, it is passed through high-frequency alternating current to the magnet exciting coil in stationary plate, generates main field；
S2, main field act on the induced potential coil on movable plate formed induced current, induced current with induced potential coil
Induced current is generated in concatenated actuating coil；
Induced current different rotation of inducting in formation direction in concatenated two coils in actuating coil of S3, movable plate actuating coil
Turn magnetic field；
The X-axis receiving coil and Y-axis receiving coil that S4, rotating excitation field of inducting act on stationary plate generate induced electromotive force；
S5, calculate X-axis receiving coil generate electromotive force and Y-axis receiving coil generate electromotive force ratio, obtain movable plate with
Spatial position angle between stationary plate, the as position angle of rotor.
8. a kind of method for detecting brushless DC motor position according to claim 7, which is characterized in that the height
The frequency of frequency alternating current is 1MHz.
9. a kind of method for detecting brushless DC motor position according to claim 7, which is characterized in that the master
The magnetic field induced electromotive force difference that X-axis receiving coil, Y-axis receiving coil and the actuating coil in movable plate generate in stationary plate
It cancels out each other, exporting is 0.
10. a kind of method for detecting brushless DC motor position according to claim 7, which is characterized in that described
Method further include:
The amplitude proportion for the electromotive force that the electromotive force and Y-axis receiving coil generated by detection X-axis receiving coil generates, Yi Jiyu
The phase relation of excitation signal realizes four-quadrant angle sensor.
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| CN201910603374.5A CN110198103A (en) | 2019-07-05 | 2019-07-05 | A kind of angular displacement sensor and method detecting brushless DC motor position |
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| CN201910603374.5A CN110198103A (en) | 2019-07-05 | 2019-07-05 | A kind of angular displacement sensor and method detecting brushless DC motor position |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311156A (en) * | 2020-10-21 | 2021-02-02 | 上海俊烈汽车科技有限公司 | Rotor position sensor suitable for brushless motor and brushless motor |
| CN117704956A (en) * | 2024-02-05 | 2024-03-15 | 国机传感科技有限公司 | Flat angle sensor and measuring method |
-
2019
- 2019-07-05 CN CN201910603374.5A patent/CN110198103A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311156A (en) * | 2020-10-21 | 2021-02-02 | 上海俊烈汽车科技有限公司 | Rotor position sensor suitable for brushless motor and brushless motor |
| CN117704956A (en) * | 2024-02-05 | 2024-03-15 | 国机传感科技有限公司 | Flat angle sensor and measuring method |
| CN117704956B (en) * | 2024-02-05 | 2024-04-26 | 国机传感科技有限公司 | Flat angle sensor and measuring method |
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