CN107064542A - Wind-driven generator shafting rotating speed measurement method based on magnetic grid bar pulse signal - Google Patents
Wind-driven generator shafting rotating speed measurement method based on magnetic grid bar pulse signal Download PDFInfo
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- CN107064542A CN107064542A CN201610969643.6A CN201610969643A CN107064542A CN 107064542 A CN107064542 A CN 107064542A CN 201610969643 A CN201610969643 A CN 201610969643A CN 107064542 A CN107064542 A CN 107064542A
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- rotating speed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
The present invention proposes a kind of wind-driven generator shafting speed measuring system and method based on magnetic grid bar pulse signal.Including magnetic grid bar and corresponding pulse signal read head, for the data acquisition unit of step-by-step counting, the data processing unit of rotary shaft rotating speed is calculated according to counted number of pulses and gate time；Magnetic grid bar is arranged on wind driven generator rotation axle, and read head is fixed on the corresponding position of magnetic grid bar by clipping room.Installation operation facility of the present invention, it is less demanding to installation site, it is provided simultaneously with high tachometric survey precision.
Description
Technical field
The invention belongs to technical field of wind power generation, and in particular to a kind of wind-driven generator based on magnetic grid bar pulse signal
Shafting transmission system speed measuring system and method.
Background technology
Common wind-driven generator uses the installation pattern of trunnion axis, is turned wind wheel by powerful raising speed gear-box
Speed brings up to the generating rotating speed matched with rear end generator.Just because of the presence of gear-box so that the machinery of wind-driven generator
Structure is more complicated, reaches after certain time limit, mechanical breakdown starts to take place frequently.In order in mechanical component failures germination period just by it
Find out, the loss brought after processing with reducing after unit failure is right, it is necessary in the key position install sensor of wind-driven generator
The running status of unit is monitored, assessed.General monitoring means is the vibration signal for gathering unit operation, when being carried out to it
Domain and the analysis of frequency domain, and then operation irregularity part when detecting unit operation, early warning is carried out to failure.To vibration signal
When doing frequency-domain analysis, the tachometric survey of accurate shaft system of unit transmission is indispensable.
At present, the solution of the industrial common tachometric survey for wind-driven generator has two kinds.The first is base
The laser revolution counter of rotating speed is measured, it is necessary to coordinate reflective sticker to use in the principle of reflection of light.Laser revolution counter transmitting laser
Meanwhile, reception system is received after reflection light, can produce a pulse signal, and once rotation is recorded with this and (works as rotary shaft
During upper only a piece of reflective sticker).There is no the part for pasting reflecting material on object being measured, can be overflow after being irradiated by laser
Reflect, therefore reflection light can not be returned in the reception system of laser revolution counter, would not be also recorded.Second is to be based on light
The rotation-speed measuring device of photoelectric coder.The device is widely used in the detection of motor speed, is typically mounted on where rotor
Axle on, often circle can produce thousands of pulse signals angularly evenly distributed, can be used for monitoring turning for rotary shaft simultaneously
Speed and phase.Two methods can be applied in the tachometric survey of wind-driven generator, but all not all roses.Laser rotating speed is surveyed
Amount is due to the limitation in reflecting piece and light source point footpath, it is impossible to complete the high-precision tachometric survey in the case of speed change；Photoelectric encoder
It can meet the requirement of high-precision speed change measurement in precision, but its complex installation process, entirely it is driven in wind-driven generator
There is no specially suitable installation site in system.
The content of the invention
It is less demanding to installation site it is an object of the invention to propose a kind of installation operation facility, it is provided simultaneously with high turn
The wind-driven generator shafting speed measuring system and method for fast measurement accuracy.
In order to solve the above-mentioned technical problem, the present invention provides a kind of wind-driven generator shafting based on magnetic grid bar pulse signal
Speed measuring system, including magnetic grid bar and corresponding pulse signal read head, for the data acquisition unit of step-by-step counting, according to arteries and veins
Rush count value and gate time calculates the data processing unit of rotary shaft rotating speed；Magnetic grid bar is arranged on wind driven generator rotation axle
On, read head is fixed on the corresponding position of magnetic grid bar by clipping room.
Further, there is signal conditioning circuit between read head and data acquisition unit, meet the pulse signal that read head is read
The data inputting requirement of data acquisition unit.
Further, data processing unit calculates rotary shaft rotating speed using one of following two modes：
Mode one：The rotating speed for determining pulse number is calculated
When the trigger condition that rotating speed is calculated is added to up to setting value N for step-by-step counting, data processing unit is according to following formula meter
Rotary shaft rotating speed rpm is calculated,
In formula, N0The umber of pulse for turning around and triggering is revolved by magnetic grid bar, t is the duration of step-by-step counting cumulative process；
Mode two：The rotating speed for determining the pulse collection time is calculated
When the trigger condition that rotating speed is calculated reaches setting value T for the step-by-step counting cumulative time, data processing unit is under
Formula calculates rotary shaft rotating speed rpm, according to the step-by-step counting N of data acquisition unitT, rotating speed is calculated, its calculation formula is as follows：
In formula, NTFor the pulse total count value in time T；T is the cumulative setting value of gate time, N0Rotated for magnetic grid bar
The triggered umber of pulse of one circle.
Further, when rotary shaft rotates at a high speed, occupation mode one calculates rotating speed, during rotary shaft low speed rotation, occupation mode
Two calculate rotating speed.
The present invention also proposes a kind of wind-driven generator shafting rotating speed measurement method based on magnetic grid bar pulse signal, including magnetic
Grizzly bar and corresponding pulse signal read head, for the data acquisition unit of step-by-step counting, according to counted number of pulses and gate time
Calculate the data processing unit of rotary shaft rotating speed；Magnetic grid bar is arranged on wind driven generator rotation axle, and read head is solid by clipping room
It is scheduled on the corresponding position of magnetic grid bar.
Further, there is signal conditioning circuit between read head and data acquisition unit, meet the pulse signal that read head is read
The data inputting requirement of data acquisition unit.
Further, data processing unit calculates rotary shaft rotating speed using one of following two modes：
Mode one：The rotating speed for determining pulse number is calculated
When the trigger condition that rotating speed is calculated is added to up to setting value N for step-by-step counting, data processing unit is according to following formula meter
Rotary shaft rotating speed rpm is calculated,
In formula, N0The umber of pulse for turning around and triggering is revolved by magnetic grid bar, t is the duration of step-by-step counting cumulative process；
Mode two：The rotating speed for determining the pulse collection time is calculated
When the trigger condition that rotating speed is calculated reaches setting value T for the step-by-step counting cumulative time, data processing unit is under
Formula calculates rotary shaft rotating speed rpm, according to the step-by-step counting N of data acquisition unitT, rotating speed is calculated, its calculation formula is as follows：
In formula, NTFor the pulse total count value in time T；T is the cumulative setting value of gate time, N0Rotated for magnetic grid bar
The triggered umber of pulse of one circle.
Further, when rotary shaft rotates at a high speed, occupation mode one calculates rotating speed, during rotary shaft low speed rotation, occupation mode
Two calculate rotating speed.
Compared with prior art, its remarkable advantage is the present invention, and invention is based on magnetic grid bar pulse signal to wind-power electricity generation
Arbor system transmission system rotating speed is measured, while having easy for installation, the requirement to installation site is low and tachometric survey precision
It is high.
Brief description of the drawings
Fig. 1 is the wind-driven generator shafting speed measuring system composition frame chart based on magnetic grid bar pulse signal.
Fig. 2 is the wind-driven generator shafting rotating speed measurement method flow chart based on magnetic grid bar pulse signal.
Embodiment
It is readily appreciated that, according to technical scheme, in the case where not changing the connotation of the present invention, this area
Those skilled in the art can imagine the wind-driven generator shafting speed measuring system based on magnetic grid bar pulse signal of the invention
And the numerous embodiments of method.Therefore, detailed description below and accompanying drawing are only the examples to technical scheme
Property explanation, and be not to be construed as the whole of the present invention or be considered as limitation or restriction to technical solution of the present invention.
Wind-driven generator shafting transmission system speed measuring system based on magnetic grid bar pulse signal can be divided into magnetic grid arteries and veins
Rush Signal sampling and processing gathered data and calculate rotating speed two large divisions.
The installation of magnetic grid bar
Magnetic grid bar has three-decker, and intermediate layer is magnetic grid magnetic stripe, and there is equally distributed magnetic stripe at equal intervals inside, is wrapped in magnetic
Bar is two layers of stainless steel metal, protects magnetic stripe, it is to avoid sustained damage during work.Magnetic grid bar can be bent, and be adhesive in by AB
In the exposed rotary shaft of wind-driven generator, it is desirable to which the seam crossing connection of magnetic grid bar is carefully and neatly done, without projection.After installation, magnetic grid
Bar should form the annulus of a standard, and and rotating shaft coaxle on the rotary shaft.The umber of pulse N that magnetic grid bar is often enclosed0Can be by used
Interval d between magnetic grid bar total length divided by two magnetic grids is obtained, when magnetic grid bar and rotary shaft are rotated together with needed for generation read head
Magnetic grid triggering.
The installation of read head
Read head is a rectangular planes to the actual induction face of magnetic grid bar, it is desirable to actual induction face and the outer ring of magnetic grid bar
The vertical range of steel bar is between 2mm~3mm, and actual induction face and the annulus that magnetic grid bar is formed are tangent.The long side place side of read head
To should be in rotary shaft direction of rotation magnetic grid bar direction of rotation it is identical.When the relay indicating light on read head is blueness, represent
Its is working properly；If it is red, need to be adjusted read head by above-mentioned requirements.Fixation to read head should be stable
Firmly, influenceed with ensureing not produced by unit vibration during its work.Read head reads the rotation information of magnetic grid bar, and sensitive surface is every
Become by a magnetic grid lattice and produce a pulse signal transmission to data acquisition unit.
The data inputting of data acquisition unit
It is required that the pulse output signals of read head and the pulse typing signal of data acquisition unit match, between the two may
Increase signal conditioning circuit is needed so that pulse signal meets the data inputting requirement of data acquisition unit.Modulate circuit needs pair
The width of pulse signal, amplitude, account for work(and adjusted than suitably, under the premise of signal is distortionless so that the pulse letter of read head
Number meet the signal typing requirement of data acquisition unit.The pulse signal that data acquisition unit is transmitted to read head carries out counting guarantor
Deposit.
Rotating speed is calculated
Data processing unit reads the pulse-counting data on data acquisition unit, is turned based on the data by programming realization
The calculating of speed.Rotating speed computational methods are as follows：
(1) rotating speed for determining pulse number is calculated：The trigger condition that now rotating speed is calculated is added to up to one for step-by-step counting
After setting value, the duration of accumulative process is recalled from data processing unit, rotating speed is calculated.Its calculation formula is as follows：
In formula, rotating speed rpm unit for rev/min；N tires out setting value for the number of step-by-step counting；T is that step-by-step counting is added to N
Gate time, unit is the second；N0The umber of pulse for turning around and triggering is revolved by magnetic grid.This method is applied to turning for high-speed rotating shaft
Speed measurement.
(2) rotating speed for determining the pulse collection time is calculated：The trigger condition that now rotating speed is calculated is the step-by-step counting cumulative time
When reaching setting value, according to data acquisition unit inside counting accumulated result, rotating speed is calculated, its calculation formula is as follows：
In formula, rotating speed rpm unit for rev/min；NTFor the accumulated value of step-by-step counting in time T；T is the tired of gate time
Definite value is added, unit is the second；N0The umber of pulse for turning around and triggering is revolved by magnetic grid.This method is applied to the rotating speed of low-speed rotary shaft
Measurement.
Both the above rotating speed measurement method can measure needs according to actual speed and switch over, to realize different work(
Energy.
Claims (8)
1. the wind-driven generator shafting speed measuring system based on magnetic grid bar pulse signal, it is characterised in that including magnetic grid bar and
Corresponding pulse signal read head, for the data acquisition unit of step-by-step counting, calculates according to counted number of pulses and gate time and revolves
The data processing unit of rotating shaft rotating speed；
Magnetic grid bar is arranged on wind driven generator rotation axle, and read head is fixed on the corresponding position of magnetic grid bar by clipping room.
2. the wind-driven generator shafting speed measuring system as claimed in claim 1 based on magnetic grid bar pulse signal, its feature exists
In, have signal conditioning circuit between read head and data acquisition unit, make read head read pulse signal meet data acquisition unit
Data inputting requirement.
3. the wind-driven generator shafting speed measuring system as claimed in claim 1 based on magnetic grid bar pulse signal, its feature exists
In data processing unit calculates rotary shaft rotating speed using one of following two modes：
Mode one：The rotating speed for determining pulse number is calculated
When the trigger condition that rotating speed is calculated is added to up to setting value N for step-by-step counting, data processing unit is calculated according to following formula to be revolved
Rotating shaft rotating speed rpm,
<mrow>
<mi>r</mi>
<mi>p</mi>
<mi>m</mi>
<mo>=</mo>
<mfrac>
<mi>N</mi>
<mrow>
<mi>t</mi>
<mo>*</mo>
<msub>
<mi>N</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
</mrow>
In formula, N0The umber of pulse for turning around and triggering is revolved by magnetic grid bar, t is the duration of step-by-step counting cumulative process；
Mode two：The rotating speed for determining the pulse collection time is calculated
When the trigger condition that rotating speed is calculated reaches setting value T for the step-by-step counting cumulative time, data processing unit is according to following formula meter
Rotary shaft rotating speed rpm is calculated, according to the step-by-step counting N of data acquisition unitT, rotating speed is calculated, its calculation formula is as follows：
<mrow>
<mi>r</mi>
<mi>p</mi>
<mi>m</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>N</mi>
<mi>T</mi>
</msub>
<mrow>
<mi>T</mi>
<mo>*</mo>
<msub>
<mi>N</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
</mrow>
In formula, NTFor the pulse total count value in time T；T is the cumulative setting value of gate time, N0Turned around for the rotation of magnetic grid bar
The umber of pulse triggered.
4. the wind-driven generator shafting speed measuring system as claimed in claim 3 based on magnetic grid bar pulse signal, its feature exists
In when rotary shaft rotates at a high speed, occupation mode one calculates rotating speed, during rotary shaft low speed rotation, and occupation mode two calculates rotating speed.
5. the wind-driven generator shafting rotating speed measurement method based on magnetic grid bar pulse signal, it is characterised in that including magnetic grid bar and
Corresponding pulse signal read head, for the data acquisition unit of step-by-step counting, calculates according to counted number of pulses and gate time and revolves
The data processing unit of rotating shaft rotating speed；Magnetic grid bar is arranged on wind driven generator rotation axle, and read head is fixed on magnetic by clipping room
The corresponding position of grizzly bar.
6. the wind-driven generator shafting rotating speed measurement method as claimed in claim 5 based on magnetic grid bar pulse signal, its feature exists
In, have signal conditioning circuit between read head and data acquisition unit, make read head read pulse signal meet data acquisition unit
Data inputting requirement.
7. the wind-driven generator shafting rotating speed measurement method as claimed in claim 5 based on magnetic grid bar pulse signal, its feature exists
In data processing unit calculates rotary shaft rotating speed using one of following two modes：
Mode one：The rotating speed for determining pulse number is calculated
When the trigger condition that rotating speed is calculated is added to up to setting value N for step-by-step counting, data processing unit is calculated according to following formula to be revolved
Rotating shaft rotating speed rpm,
<mrow>
<mi>r</mi>
<mi>p</mi>
<mi>m</mi>
<mo>=</mo>
<mfrac>
<mi>N</mi>
<mrow>
<mi>t</mi>
<mo>*</mo>
<msub>
<mi>N</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
</mrow>
1
In formula, N0The umber of pulse for turning around and triggering is revolved by magnetic grid bar, t is the duration of step-by-step counting cumulative process；
Mode two：The rotating speed for determining the pulse collection time is calculated
When the trigger condition that rotating speed is calculated reaches setting value T for the step-by-step counting cumulative time, data processing unit is according to following formula meter
Rotary shaft rotating speed rpm is calculated, according to the step-by-step counting N of data acquisition unitT, rotating speed is calculated, its calculation formula is as follows：
<mrow>
<mi>r</mi>
<mi>p</mi>
<mi>m</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>N</mi>
<mi>T</mi>
</msub>
<mrow>
<mi>T</mi>
<mo>*</mo>
<msub>
<mi>N</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
</mrow>
In formula, NTFor the pulse total count value in time T；T is the cumulative setting value of gate time, N0Turned around for the rotation of magnetic grid bar
The umber of pulse triggered.
8. the wind-driven generator shafting rotating speed measurement method as claimed in claim 7 based on magnetic grid bar pulse signal, its feature exists
In when rotary shaft rotates at a high speed, occupation mode one calculates rotating speed, during rotary shaft low speed rotation, and occupation mode two calculates rotating speed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827628A (en) * | 2018-06-07 | 2018-11-16 | 南京理工大学 | A kind of wind turbine gearbox Vibration Condition Monitoring system and method |
| CN109669048A (en) * | 2019-02-01 | 2019-04-23 | 南京理工大学 | A kind of ship rotary axis Transient Rotate Speed Measuring device and method |
| CN109870588A (en) * | 2019-02-01 | 2019-06-11 | 南京理工大学 | A kind of ship rotary axis Transient Rotate Speed Measuring device and method |
| CN113008429A (en) * | 2021-05-24 | 2021-06-22 | 南京理工大学 | Rotating shaft dynamic and static torque measurement system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2606486Y (en) * | 2003-02-28 | 2004-03-10 | 重庆宗申技术开发研究有限公司 | Electric spray magnetic rotor on motorcycle |
| US6954063B2 (en) * | 2001-03-27 | 2005-10-11 | Denso Corporation | Motion detecting device using magnetoresistive unit |
| CN202975036U (en) * | 2012-11-13 | 2013-06-05 | 潍坊永昱电控科技有限公司 | Main shaft rotating speed measuring device |
| CN103872851A (en) * | 2012-12-12 | 2014-06-18 | 中国科学院宁波材料技术与工程研究所 | Rotating speed and displacement measuring system for rotation motor |
| CN104483504A (en) * | 2014-11-11 | 2015-04-01 | 南京中旭电子科技有限公司 | Fan rotation speed sensor |
-
2016
- 2016-11-07 CN CN201610969643.6A patent/CN107064542A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6954063B2 (en) * | 2001-03-27 | 2005-10-11 | Denso Corporation | Motion detecting device using magnetoresistive unit |
| CN2606486Y (en) * | 2003-02-28 | 2004-03-10 | 重庆宗申技术开发研究有限公司 | Electric spray magnetic rotor on motorcycle |
| CN202975036U (en) * | 2012-11-13 | 2013-06-05 | 潍坊永昱电控科技有限公司 | Main shaft rotating speed measuring device |
| CN103872851A (en) * | 2012-12-12 | 2014-06-18 | 中国科学院宁波材料技术与工程研究所 | Rotating speed and displacement measuring system for rotation motor |
| CN104483504A (en) * | 2014-11-11 | 2015-04-01 | 南京中旭电子科技有限公司 | Fan rotation speed sensor |
Non-Patent Citations (1)
| Title |
|---|
| 林金泉: "磁栅传感器", 《自动检测技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827628A (en) * | 2018-06-07 | 2018-11-16 | 南京理工大学 | A kind of wind turbine gearbox Vibration Condition Monitoring system and method |
| CN109669048A (en) * | 2019-02-01 | 2019-04-23 | 南京理工大学 | A kind of ship rotary axis Transient Rotate Speed Measuring device and method |
| CN109870588A (en) * | 2019-02-01 | 2019-06-11 | 南京理工大学 | A kind of ship rotary axis Transient Rotate Speed Measuring device and method |
| CN109669048B (en) * | 2019-02-01 | 2021-12-10 | 南京理工大学 | Device and method for measuring instantaneous rotating speed of ship rotating shaft system |
| CN113008429A (en) * | 2021-05-24 | 2021-06-22 | 南京理工大学 | Rotating shaft dynamic and static torque measurement system and method |
| CN113008429B (en) * | 2021-05-24 | 2021-09-03 | 南京理工大学 | Rotating shaft dynamic and static torque measurement system and method |
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