CN103872851B - The rotating speed of electric rotating machine and displacement measurement system - Google Patents
The rotating speed of electric rotating machine and displacement measurement system Download PDFInfo
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- CN103872851B CN103872851B CN201210536692.2A CN201210536692A CN103872851B CN 103872851 B CN103872851 B CN 103872851B CN 201210536692 A CN201210536692 A CN 201210536692A CN 103872851 B CN103872851 B CN 103872851B
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Abstract
The present invention relates to a kind of rotating speed of electric rotating machine and displacement measurement system, electric rotating machine includes rotor, stator, and is used for controlling the driver of electric rotating machine.Measuring system includes bar shaped magnetic railings ruler, two magnetic grid read heads, and measuring circuit plate, and magnetic railings ruler is arranged on the periphery of rotor, and two magnetic grid read heads are placed in magnetic railings ruler outside, and two magnetic grid read heads are connected with measuring circuit plate by magnetic grid read head line respectively.Measuring circuit plate is electrically connected with the driver of electric rotating machine, and from there through two magnetic grid read heads of switching, the magnetic action using magnetic grid read head and magnetic railings ruler carries out rotating speed and displacement measurement to motor.The simple in measurement system structure of the present invention, low cost, strong environmental adaptability, and controlled motor positioning precision is high.
Description
Technical field
The present invention relates to electric rotating machine is and in particular to the rotating speed of motor and displacement measuring technology.
Background technology
In the slewing that high precision machine tool and numerical control rotating platform etc. need precise control, need the rotating speed to electric rotating machine
Carry out precise control with displacement.Generally, for the accurate measurement of electric rotating machine rotating speed and displacement, need to use specific dimensions
Circular grating or magnetic grid be affixed on rotor surface, and magnetic bar signal is read by a read head, then this signal is transmitted
To control system, control system is controlled to electric rotating machine according to this signal.However, for more than 0.5 meter of root diameter
Motor, due to the circular grating of major diameter more than 0.5 meter for the diameter or magnetic grid manufacture with install highly difficult and high cost, mesh
Circular grating or the magnetic grid of major diameter be there is no on front market.Therefore, root diameter is reached to more than 0.5 meter of motor, permissible
Surround circle using grating scale or magnetic railings ruler and be affixed on rotor surface.However, because the two ends seam of grating scale or magnetic railings ruler
It is unable to seamless connection and there is certain breach, cause displacement herein cannot measure or measure inaccurate, and then lead to motor to turn
Speed and displacement measurement are inaccurate.Therefore, it is difficult to accurately measure rotating speed and the displacement of greater trochanter diameter motor using prior art, greatly
The hi-Fix of diameter rotor motor controls and becomes a difficult problem.
Content of the invention
It is an object of the invention to provide double read heads of a kind of rotating speed being capable of accurate measurement motor and displacement and low cost are surveyed
Amount system.
For achieving the above object, the invention provides a kind of rotating speed of electric rotating machine and displacement measurement system, described rotation
Motor includes rotor, stator, and for control electric rotating machine driver it is characterised in that：
Described measuring system includes bar shaped magnetic railings ruler, two magnetic grid read heads, and measuring circuit plate；
Described magnetic railings ruler is arranged on the periphery of rotor, and described two magnetic grid read heads are placed in described magnetic railings ruler outside, and
Described two magnetic grid read heads are connected with measuring circuit plate by magnetic grid read head line respectively；And
Described measuring circuit plate is electrically connected with the driver of electric rotating machine, from there through two magnetic grid read heads of switching, utilizes
Magnetic grid read head carries out rotating speed and displacement measurement with the magnetic action of magnetic railings ruler to motor.
It is preferred that described rotor outer periphery is provided with magnetic grid groove, described bar shaped magnetic railings ruler is affixed in described magnetic grid groove, described magnetic
Grid read head is arranged on motor case.
It is preferred that described two magnetic grid read heads are placed in rotor outside, with magnetic railings ruler at a distance of less than 2mm.
It is preferred that the interval between length L of bar shaped magnetic railings ruler being attached on rotor outer periphery and described two magnetic grid read head
Angle [alpha] meets formula
2 π R ＞ L ＞ 2 π R- α π R/180+Y
Wherein R is the radius of rotor, and Y is more than the width of magnetic grid read head.
It is preferred that described measuring system indoor design has the adjustable clock of timing, when can count out motor operation
Between, and by numeral method motor positive and inverse and run distance.
It is preferred that described measuring system also includes wave filter, for out of service to motor and described two magnetic grids
The noise signal that when read head is not above magnetic railings ruler, read head collects is filtered.
It is preferred that double read head measuring systems include frequency division module, sensing subdivision module, motor operation walking direction module,
Read head condition judgment module, switching signal occur module, motor unidirectional operation handover module, double read head handover module, read head to cut
Change place selecting module, double read head data read module, double read head data sensing subdivision module, counting module, data processing mould
Block, clock module and numeral method module.
It is preferred that the core of described measuring circuit plate adopts CPLD chip, the signal of described two magnetic grid read heads and CPLD
It is respectively adopted Liang Zu tri- road input difference chip, in CPLD chip, read head signal is carried out realizing surveying by system mode machine between chip
The sensing detection of amount system, judges the working condition of magnetic grid read head, generates read head switching signal, automatic switchover read head.
It is preferred that input magnetic bar signal is stored in high-speed register by CPLD chip preserving to it, then input by two
The signal of individual read head signal and depositor preservation forms the sensing detection that Mealy type state machine carries out realizing system, thus judges
Two read heads whether on magnetic railings ruler, produce motor unidirectional operation when read head switching signal, and pass through two read head magnetic bar signals
Sensing subdivision, judge the rotating ruuning situation of motor.
It is preferred that measuring system judges the magnetic grid of system required switching in real time by the switching signal of CPLD chip internal
Read head, the read head signal of output switching.
It is preferred that magnetic grid read head adopts equal resolution, same model.
It is preferred that the magnetic railings ruler length being affixed on rotor is more than half girth of rotor.
It is preferred that two magnetic grid read head installation sites are relative to rotor diameter symmetry.
It is preferred that the acp chip of measuring system is CPLD, carry out the hardware mould of system using VHDL and Verilog HDL
Block designs.
It is preferred that two read head signals carry out sensing detection by Mealy type state machine.
It is preferred that signal filtering is to be effectively treated by Verilog hardware description language application system clock signal.
It is preferred that motor drive direction judges it is by chip internal, read head signal processing to be judged.
It is preferred that motor switching signal is to produce inside System on Chip/SoC.
It is preferred that the displacement that the motor of display rotates can be resetted by button when motor operation or motor are out of service
Reset.
It is preferred that the motor operating time of display, can be resetted by button, and adjust current initial time.
It is preferred that the displacement of motor rotation and motor operating time, display can be switched by button.
It is preferred that the signal composition Mealy type state machine that the signal of two magnetic grid read heads and depositor preserve is realized
The sensing detection of system.Signal frequency multiplication number is chosen as four times, and quadruple signal is preserved again by high-speed register, every road letter
Number there is the Phase delay of a high-frequency clock, after every road signal is negated, signal that is corresponding and depositing at a high speed is made and computing, real
The differential process of existing signal.
It is preferred that measuring system using walking direction output two paths of signals as switching signal occur module input, two
Individual status signal and motor positive and inverse signal, produce the switching signal of two magnetic grid read heads by computing in chip internal.
It is preferred that when motor one direction is run, system passes through state machine, judges the switch mode of read head；Motor reverses, and is
System judges motor positive and inverse, after read head has judged, takes contrary read head switch mode, treats next state, by state
Machine judges to need the read head of switching, then the switch mode before being switched to.
It is preferred that the read head signal of output switching passes through Mealy type state machine sensing segmenting, signal is carried out at differential
Reason.
It is preferred that can be processed by the data that data processing module counts magnetic bar signal, by Binary Conversion it is
Decimal scale, is easy to use numeral method.
It is preferred that going out motor positive and inverse and range ability by numeral method, LED diode displaying goes out real-time work
The magnetic grid read head made.
It is preferred that adding two DS26C32 difference chips between measuring system acp chip and two magnetic grid read heads.
It is preferred that adding a DS26C31 difference chip between measuring system acp chip and motor driver.
In double read head measuring systems of the electric rotating machine of the present invention, system adopts bar shaped magnetic railings ruler, is affixed on rotor circle
Week is placed in outside rotor more than half girth, two magnetic grid read heads.During motor operation, the signal of two read heads is thin through sensing
Point, filtering, motor drive direction judge etc. to determine after functional module the working condition of magnetic grid read head, generate read head switching signal, can be from
Dynamic switching read head；By the switching of double read heads, motor speed is measured with displacement；System display circuit can directly be passed through to show
Displacement, the rotating of motor and motor operating time that the read head of institute's switch operating, motor rotate are shown.
Compared with prior art, a kind of beneficial effect of the double read head measuring system of electric rotating machine of the present invention is：1）Structure letter
Single；2）System is based on magnetic induction sensor, cheap, strong environmental adaptability；3）When motor rotates and reverse, read head is all permissible
Switching, measures；4）Controlled motor positioning precision is high；5）The working condition of motor and read head directly can be shown by system
And motor operating time.
Brief description
Fig. 1 is double read head positions when electric rotating machine rotates forward of an embodiment of the double read head measuring systems according to the present invention
Move and magnetic railings ruler effective coverage schematic diagram；
Fig. 2 is double reading head location and magnetic railings ruler effective coverage schematic diagram during electric rotating machine reversion；
Fig. 3 is one of two read heads scheme of installation on motor case；
Fig. 4 is another read head scheme of installation on motor case；
Fig. 5 is the rotor side view being mounted with magnetic railings ruler and read head；
Fig. 6 is the control flow chart of core system chip；
Fig. 7 is the double read head measuring system modularized design figures based on CPLD；
Fig. 8 is double read head measuring system signal processing schematic diagram；And
Fig. 9 is double read head measuring system circuit board functional schematic.
Description of reference numerals：
1 read head, 2 read head holding wires, 3 read heads, 4 read head holding wires,
5 bar shaped magnetic railings rulers, 6 motor stators, 7 motor bearings, 8 rotors, 9 motor cases,
10 motors rotate forward, 11 magnetic railings ruler AB sections, 12 motor reversals, 13 magnetic railings ruler CD sections,
Read head string holes in 14 casing, 15 read head grooves, 16 read head grooves,
17 magnetic railings ruler grooves, read head string holes in 18 casing, 19 read head signals,
20 read head signals, 21 clock signal of system, 22 display system control signals,
23 elapsed time clock control signals, 24 numeral method output signals,
25 read head display switching signals, 26 read head switching output signals,
27 read head sensing subdivision modules, 28 read head sensing subdivision modules, 29 frequency division modules,
30 read head switching position selecting modules, 31 motor operation walking direction modules,
32 motor unidirectional operation handover modules, 33 read head condition judgment module,
34 pairs of read head data read modules, module is segmented in 35 pairs of read head data sensing,
36 switching signals generation modules, 37 counting modules, 38 pairs of read head handover modules,
39 data processing modules, 40 clock modules, 41 numeral method modules,
42EPM1270T144C5 type CPLD, 43DS26C32 difference chip I,
44DS26C32 difference chip II, 45DS26C31 difference chip, 46 read head Signal plugs,
47 read head Signal plugs, 48 system output signal plugs, 49 system output signal plugs,
50 digital pipe display circuits, 51LED light emitting diode display circuit, 52 key control circuit.
Specific embodiment
Below with reference to accompanying drawing, presently preferred embodiments of the present invention is described in detail, to become apparent from understanding the present invention's
Objects, features and advantages.It should be understood that embodiment shown in the drawings does not limit the scope of the present invention, and it is simply
The connotation of explanation technical solution of the present invention.
Double read head measuring systems of the present invention are used for carrying out accurate measurement to the rotating speed of electric rotating machine and displacement, thus accurately
The rotation of ground controlled motor.Fig. 1 and Fig. 2 is for the double read heads in an embodiment of double read head measuring systems of the present invention in magnetic grid
Magnetic railings ruler effective coverage schematic diagram when position and motor rotate and reverse on chi.As illustrated in fig. 1 and 2, magnetic grid read head 1 and magnetic grid are read
3 are placed in rotor 8 periphery side, and two magnetic grid read heads are with regard to rotor 5 diameter symmetry, that is, separately 180 between them
Degree.Read head 1 and read head 3 pass through magnetic grid read head line 2 and magnetic grid read head line 4 and double circuit boards spending head measuring systems or motor respectively
Driver（Not shown）Electrical connection.The radius of hypothesis rotor is R, then 8 weeks a length of 2 π R of rotor.It is attached to rotary motor rotor
Half girth that length L of the bar shaped magnetic railings ruler 5 on periphery should be greater than rotor 8 adds the width of a magnetic grid read head, that is, full
Sufficient below equation
L ＞ π R+X formula（I）
Wherein X is more than the width of read head 1 and read head 3.So can guarantee that whenever in two read heads a minimum of one
On magnetic railings ruler 5.
It is pointed out that two magnetic grid read heads can also be not in relation to the diameter symmetry of rotor 5, the interval between them can
Think that 30 degree, 60 degree or 90 degree etc. are arbitrarily less than the angle [alpha] of 180 degree, i.e. 0 ＜ α≤180.Now, length L of magnetic grid
Need to meet below equation
2 π R ＞ L ＞ 2 π R- α π R/180+Y formula（II）
Wherein Y be more than magnetic grid read head 1 and magnetic grid read head 3 width so that it may ensure whenever in two magnetic grid read heads
Rare one on magnetic railings ruler 5.
When motor rotates forward 10, A point is read head 1, the switching starting point of read head 3, and B point is terminating point, and AB has for magnetic railings ruler
Effect section 11, the pulse reading distance that motor rotates a circle is 2 times of A to B camber line distance.When motor reversal 12, C point is read head
1st, the switching starting point of read head 3, D point is terminating point, and CD is the effective section of magnetic railings ruler 13, the pulse reading distance that motor rotates a circle
For C to D camber line distance 2 times.
It is preferred that two magnetic grid read heads adopt equal resolution, same model.
Fig. 3 and Fig. 4 is magnetic grid read head 1 and 3 scheme of installation on motor case 9 respectively, for clarity, only illustrates machine
A part for shell.As shown in figure 3, having a groove 15 on the position of rotor 8 in casing 9, this groove 15 is used for pacifying
Dress magnetic grid read head 1, read head 1 is fixed in read head groove 15（By bonding or threaded etc.）, read head 1 and magnetic railings ruler
5 at a distance of less than 2mm, and read head line 2 is drawn from string holes 14.As shown in figure 4, having one in casing 9 on the position of rotor 8
Individual groove 16, this groove 16 is used for installing magnetic grid read head 3, and read head 3 is fixed in read head groove 16（Such as pass through bonding or spiral shell
Stricture of vagina connection etc.）, at a distance of less than 2mm, read head line 4 is drawn from string holes 18 for read head 3 and magnetic railings ruler 5.Groove 15 and the position of groove 16
Put with regard to rotor diameter symmetry.
Fig. 5 is the side view of rotor.As shown in figure 5, circumferentially arranged with magnetic grid groove 17 on rotor.Bar shaped magnetic grid
Chi 5 is affixed in the magnetic grid groove 17 of rotor 8, and the length of magnetic railings ruler 5 only needs to meet above-mentioned formula（I）, without
Stick the whole circumference of rotor 8.Read head 1（With read head 3, not shown）It is arranged on above magnetic railings ruler 5, and pass through magnetic grid read head
Line 2 is connected to the circuit board of measuring system（As shown in Figure 9）.Magnetic grid read head line 2（And magnetic grid read head line 4）Preferably by carrying
The holding wire of shield sheath is constituted.
Alternatively, it is also possible to be not provided with magnetic grid groove, and directly magnetic railings ruler is pasted onto by the outer of rotor by bonding agents such as glue
Zhou Shang.
In double read head measuring systems of the present invention, in addition to above-mentioned magnetic railings ruler and magnetic grid read head, also include corresponding
Signal processing unit, this signal processing unit has corresponding circuit and chip, the sensing subdivision of achievable magnetic grid, signal filter
The functions such as ripple, read head switching, displacement digital display.
Fig. 6 is System on Chip/SoC CPLD (the ComplexProgrammable Logic of double read head measuring systems of the present invention
Device；CPLD) control flow chart.As shown in fig. 6, when motor operation, System on Chip/SoC CPLD 42
Input magnetic bar signal is stored in high-speed register it is preserved, then will input two read head signals（The letter of two read heads
Number by between magnetic railings ruler and magnetic grid read head magnetic action produce）The signal composition Mealy preserving with depositor（Meter Li）Type state
Machine carries out realizing the sensing detection of system.Thus judge two read heads whether on magnetic railings ruler, produce and read during motor unidirectional operation
Head switching signal.Simultaneously by the sensing subdivision of two read head magnetic bar signals, judge the rotating ruuning situation of motor.By motor
The situation of the switching signal of unidirectional operation and motor positive and inverse generates the switch pulse signal of double read heads, can in motor operation
Switching read head work in real time.Sensing subdivision is carried out to the read head signal of switching simultaneously, motor is shown by digital display system
Rotating, and range ability, LED（Light-Emitting Diode）Display system shows the read head of real time operation.Internal system design one
The adjustable clock of individual timing, can count out motor operating time, realize cutting between time and motor operation distance by button switching
Change display.
Specifically, it is respectively adopted the input of Liang Zu tri- tunnel between the signal of magnetic grid read head 1 and magnetic grid read head 3 and CPLD 35
Difference chip 43,44.In CPLD 42, read head signal 19 and read head signal 20 carry out realizing the sensing detection of system by state machine,
Judge the working condition of magnetic grid read head, generate read head switching signal 26, can automatically switch read head, chip 42 and motor driver it
Between adopt one group of three tunnel output difference chip 45.By the switching of double read heads, motor speed and displacement are measured.May be used simultaneously
Motor positive and inverse is shown by charactron 50, and range ability, LED light emitting diode 51 shows the read head 25 of real time operation,
Motor operating time.
Fig. 7 is the double read head measuring system modularized design figures based on CPLD chip of the control flow for realizing Fig. 6.
Double read head measuring system application EPM1270T144C5 type CPLD chips 42 realize the sensing subdivision of magnetic grid, signal filtering, read head are cut
The integrated of function such as change, constitute Embedded Double read head switched system.Using the development scheme of hardware designs software implementation, using VHDL
(Very-High-Speed Integrated Circuit Hardware Description Language；High speed integrated electrical
Road hardware description language) and Verilog HDL（Verilog Hardware DescriptionLanguage；Verilog is hard
Part description language）Two kinds of hardware description languages carry out the hardware module development of system.Wherein signal filtering is realized by wave filter, with
The noise signal that when and magnetic grid read head out of service to motor be not on magnetic railings ruler, read head collects carries out software filtering
As shown in fig. 7, double read head measuring systems include frequency division module 29, sensing subdivision module 27,28, motor operation direction
There is module 36, motor unidirectional operation handover module 32, double reading in judge module 31, read head condition judgment module 33, switching signal
Head handover module 38, read head switching position selecting module 30, double read head data read module 34, double read head data sensing subdivision mould
Block 35, counting module 37, data processing module 39, clock module 40 and numeral method module 41.
In Fig. 7, system clock frequency is divided into four kinds of dissimilar clocks by the frequency division module 29 of system.One is magnetic grid letter
Number detection clock, with ensure magnetic bar signal reliability detect；Two is processing data information clock, coordinates defeated with each modular circuit
Go out to postpone；Three is the filtering clock of detection read head；Four is read head switching position adjustment clock, adjusts read head by clock delay
Switching position.These four different clocks, connect other modules, provide work clock for it.Two groups of A, B magnetic grids of double read head inputs
Signal segments module 27,28 via sensing, identifies the forward and reverse of motor operation respectively, forms two paths of signals.Two-way is believed
Number the rotating of the motor and read head signal whether on magnetic grid is drawn by motor operation walking direction module 31.By two read heads
Whether judge double read heads simultaneously on magnetic railings ruler and when different in the signal input on magnetic grid to read head condition judgment module 33
Two states on magnetic railings ruler.There is the input of module 36 by two states signal as switching signal, draw motor list
To read head switch selection signal when running.Draw the positive and negative rotaring signal of motor as electricity by motor operation walking direction module 31
The input of machine unidirectional operation handover module 32, can adjust reading to be switched immediately when motor unidirectional operation inverts suddenly
Head, module output read head switching adjustment signal.Read head switching adjustment signal via motor unidirectional operation handover module 32 output
Read head switch selection signal during the motor unidirectional operation occurring module 36 to export with switching signal, produces read head switching and selects letter
Number, switching magnetic grid read head in real time.Read head switch selection signal is adjusted in motor operation by read head switching position selecting module 30
When read head switching position.Two groups of A, B, R magnetic bar signals that read head switching signal after adjustment and magnetic grid read head collect are by double
Read head data read module 34 forms one group of A, B, R magnetic bar signal in motor operation, feeds back in motor driver.Generate
One group of A, B, R magnetic bar signal segments module 35 via double read head data sensing, its sensing is segmented, identifies a road subdivision's signal
And motor operation direction signal.This subdivision's signal and motor operation direction signal pass through counting module 37 counting and judge motor operation
Distance.The enumeration data that counting module 37 is exported is processed by data processing module 39, and binary system is converted into decimal scale, convenient
In numeral method.Button control signal and system clock are as the input of clock module 40, the time of adjustable motor operation.
The motor operating time adjustment signal of the decimal data of data processing module 39 output and clock module 40 output is as number
The input of pipe display module 41, numeral method module 41 exports position choosing and the Duan Xuan of charactron, therefore can be shown by charactron
Run time and the motor operation distance of system are shown.
Fig. 8 is the double read head control system signal processing schematic diagrams according to the present invention.As shown in figure 8, the input of CPLD 42
If signal directly adopts input signal A1+, A1-, B1+, B1-, R1+, R1- and the read head Signal plug 47 of read head Signal plug 46
Input signal A2+, A2-, B2+, B2-, R2+, R2-, low and high level signal occurs common mode disturbances, swinging of signal.Therefore exist
Two DS26C 32 difference chips 43,44 are added between CPLD 42 and two input read head Signal plugs 46,47, defeated in chip
Exit port and system output signal plug 48 also access DS26D 31 difference chip 45, have reached purpose resistant to common code interference.
Fig. 9 is the measuring circuit plate of double read head measuring systems of the present invention（Pcb board）Functional schematic.As shown in figure 9, it is double
It is integrated with CPLD acp chip 42, numeral method 50, LED diode displaying 51 in the pcb board of read head measuring system, press
Key control 52, signal differential 43,44,45, the functional circuit such as signal transmitting and receiving 46,47,48.Measuring circuit plate and the driver of motor
Electrical connection.
Present invention application bar shaped magnetic railings ruler, detects the swing offset of motor by the way of the switching of double magnetic grid read heads, can
High accuracy control motor.Bar shaped magnetic railings ruler is affixed on rotor, and does not need to stick the complete cycle of rotor.Two magnetic grid read heads are placed in
Outside rotor, above magnetic railings ruler, with magnetic railings ruler at a distance of less than 2mm and symmetrical with root diameter.During motor operation, two
The signal of individual read head determines the working condition of magnetic grid read head by CPLD chip sensing subdivision, filtering, motor drive direction after being judged, generate
Read head switching signal, can automatically switch read head.By the switching of double read heads, motor speed and displacement are measured, can directly lead to
When the system display circuit of mistake shows displacement, the rotating of motor and the motor operation that the read head of institute's switch operating, motor rotate
Between.
The electric rotating machine rotating speed of the present invention and displacement measurement system structure are simple, cheap, strong environmental adaptability, control
Motor positioning precision processed is high, is with a wide range of applications and important value.
Below described presently preferred embodiments of the present invention in detail, it is understood that saying having read the above-mentioned of the present invention
After awarding content, those skilled in the art can make various changes or modifications to the present invention.These equivalent form of values equally fall within this
Application appended claims limited range.
Claims (8)
1. a kind of rotating speed of electric rotating machine and displacement measurement system, described electric rotating machine includes rotor, stator, and is used for controlling
The driver of electric rotating machine it is characterised in that：
Described measuring system includes bar shaped magnetic railings ruler, two magnetic grid read heads, and measuring circuit plate；
Described magnetic railings ruler is arranged on the periphery of rotor, and described two magnetic grid read heads are placed in described magnetic railings ruler outside, and described
Two magnetic grid read heads are connected with measuring circuit plate by magnetic grid read head line respectively；And
Described measuring circuit plate is electrically connected with the driver of electric rotating machine, from there through two magnetic grid read heads of switching, using magnetic grid
Read head carries out rotating speed and displacement measurement with the magnetic action of magnetic railings ruler to motor；Wherein
The periphery of described rotor is provided with magnetic grid groove, and described bar shaped magnetic railings ruler is affixed in described magnetic grid groove, and described magnetic grid read head sets
Put on motor case；And
Described two magnetic grid read heads are placed in rotor outside, with magnetic railings ruler at a distance of less than 2mm；
And, the interval angles α being attached between length L of bar shaped magnetic railings ruler on rotor outer periphery and described two magnetic grid read head is full
Sufficient formula
2 π R ＞ L ＞ 2 π R- α π R/180+Y
Wherein R is the radius of rotor, and Y is more than the width of magnetic grid read head,
And α meets 30 °≤α≤180 °；
Wherein, described measuring system is double read head measuring system, and described pair of read head measuring system includes frequency division module, sensing subdivision
There is module, the switching of motor unidirectional operation in module, motor operation walking direction module, read head condition judgment module, switching signal
Module, double read head handover module, read head switching position selecting module, double read head data read module, double read head data sensing are thin
Sub-module, counting module, data processing module, clock module and numeral method module.
2. measuring system according to claim 1 it is characterised in that：Two magnetic grid read head installation sites are relative to rotor
Diameter symmetry.
3. measuring system according to claim 1 it is characterised in that：Described measuring system indoor design has a timing
Adjustable clock, can count out motor operating time, and by numeral method motor positive and inverse and runs distance.
4. measuring system according to claim 1 it is characterised in that：Described measuring system also includes wave filter, is used for
The noise signal that when and described two magnetic grid read head out of service to motor be not above magnetic railings ruler, read head collects is filtered
Ripple.
5. measuring system according to claim 1 it is characterised in that：The signal of two magnetic grid read heads and depositor preserve
Signal forms the sensing detection that Mealy type state machine carries out realizing system；And, signal frequency multiplication number is chosen as four times, by four times
Frequency signal preserves again by high-speed register, and every road signal has the Phase delay of a high-frequency clock, and every road signal is taken
Anti- signal that is corresponding and depositing at a high speed is made and computing afterwards, realizes the differential process of signal.
6. measuring system according to claim 1 it is characterised in that：The core of described measuring circuit plate adopts CPLD core
Piece, is respectively adopted Liang Zu tri- road input difference chip, CPLD chip between the signal of described two magnetic grid read heads and CPLD chip
Middle read head signal carries out realizing the sensing detection of measuring system by system mode machine, judges the working condition of magnetic grid read head, generates
Read head switching signal, automatic switchover read head.
7. measuring system according to claim 6 it is characterised in that：Input magnetic bar signal is stored in and posts at a high speed by CPLD chip
Storage preserves to it, then inputs and forms Mealy type state machine by the signal that two read head signals and depositor preserve and enter
Row realizes the sensing detection of system, thus judges two read heads whether on magnetic railings ruler, when producing motor unidirectional operation, read head is cut
Change signal, and by the sensing subdivision of two read head magnetic bar signals, judge the rotating ruuning situation of motor.
8. measuring system according to claim 6 it is characterised in that：The switching letter by CPLD chip internal for the measuring system
Number judge the magnetic grid read head of system required switching in real time, the read head signal of output switching.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210536692.2A CN103872851B (en) | 2012-12-12 | 2012-12-12 | The rotating speed of electric rotating machine and displacement measurement system |
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| CN201210536692.2A CN103872851B (en) | 2012-12-12 | 2012-12-12 | The rotating speed of electric rotating machine and displacement measurement system |
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| CN105499461A (en) * | 2016-01-25 | 2016-04-20 | 安阳锻压机械工业有限公司 | Device for numerically controlling position of hammer and detecting impact energy in severe environments |
| CN107064542A (en) * | 2016-11-07 | 2017-08-18 | 南京理工大学 | Wind-driven generator shafting rotating speed measurement method based on magnetic grid bar pulse signal |
| CN108637793A (en) * | 2018-07-24 | 2018-10-12 | 上海第机床厂有限公司 | The index precision detecting device of rotary table and its detection compensation method |
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