[introduction]Rotate coder is one kind can change change of buy of dislocation coming back the parts of an apparatus that signal of amount to word outputs, they have wide application in a lot of industries and application, include the field such as product of electron of technology of industrial automation, robot, car, consumption and medical treatment equipment.

Rotate coder is one kind can change change of buy of dislocation coming back the parts of an apparatus that signal of amount to word outputs, they have wide application in a lot of industries and application, include the field such as product of electron of technology of industrial automation, robot, car, consumption and medical treatment equipment.

In a lot of application, need is accurate the point of view that measures gig body, rotate the angle information that coder can provide high accuracy, use at navigation, fixed position and control system. In addition, rotate through monitoring the change of coder, can calculate those who give an object to rotate speed and acceleration, this is in a lot of athletic control systems is very important.

Rotate coder often also is used in feedback system, it is for example in robot control, they can provide the real time information about machine arm or joint position, in order to realize accurate behavioral control and fixed position. Be in without in brushing dc machine to control a system, rotate the feedback that coder uses at providing electric machinery rotate speed and place, come true to accurate electric machinery is controlled and adjust thereby.

As ceaseless progress of the technology, new-style whirl coder is more and more cabinet and accurate, can provide the angle of higher resolution or positional information, have better interference rejection ability and durable sex at the same time. In addition, a few advanced whirl coder still has communication interface, can undertake with other equipment or system data switch is mixed compositive, expanded thereby their applied limits and functional sex.

Rotate the working principle of coder and type

Rotate coder works according to its the principle can divide with use means it is two kinds big: Very form (Absolute) rotate coder and increment type (Incremental) rotate coder.

Very form rotates coder

Very form rotates coder can be read directly take rotate the exact position information of the component, and need not be calculated through initial drop or revolution the position, runner shaft of OK and accurate output coming back is opposite the position at initiative condition, can regard a kind of angle as sensor. After although starting a system afresh,this is meant, also can carry accurate positional memory, won’t appear positional deflection or missing problem.

Very form rotates coder is accurate to need and real time the application of positional information, if the machine is person control, accurate the domain such as instrument and industrial automation is very applicable.

Increment type rotates coder

Increment type rotates coder also calls opposite type coder (Relative Encoder) , rotate through computation the metabolic capacity of the component will obtain positional information, include optics or magnetic parts of an apparatus or appliance normally, the pulse signal that produces increment type will calculate rotate speed and position, can output the signal that moves about runner shaft coming back, general meeting changes the signal that is speed, distance, minutely rotate speed or position further by other parts of an apparatus or circuit. They compare very form coder normally simpler, cost is lower, but position of rest of the calibration when need is being started, may appear otherwise positional deflection problem.

Increment type rotates coder applies to a few need basic position feedbacks and in the application with inferior cost, like common industry machinery, consumption electronic product and motion control a system to wait, increment type rotates coder is a common choice.

Rotate besides the very form with working principle and increment type coder will undertake classified besides, if use a technology to have classified word, can divide into mechanical to rotate coder, magnetism rotates coder, optics rotates coder, capacitance rotates coder, they have different character and advantage in specific applying.

1.Mechanical rotates coder

Mechanical rotates coder is sensor of a kind of buy of dislocation coming back that is based on mechanical contact, main by plate-spinning coming back dish, fixed dish dish and read take implement composition. Mechanical rotates coder includes a gyral dish normally dish (also call dish piece) , the groovy Kong Huo that there is quarter to have code above caves. Fixed dish dish it is to be located in plate-spinning coming back dish the fixed part of lower part, the groovy Kong Huo that there also is correspondence above caves. Read take implement fixed in plate-spinning coming back dish upper part or dish dish lower part, can read aperture extraction groove or caving change.

When plate-spinning coming back dish when roll, read take implement read take dish dish the groovy Kong Huo that go up caves, generate corresponding pulse signal, according to the amount of pulse signal and order, can rotate certainly the angle of the component or position. The precision of coder and resolution, depend on dish dish on groovy aperture or caving density and range way.

Mechanical rotates because coder does not have electronic parts, because this is opposite simple and reliable, apply to a few application setting that do not need high accuracy and high rate. Rotate with optics or magnetism coder photograph is compared, mechanical rotates the cost of coder normally inferior, suit the application with a few limited budgets. Because do not depend on optics or magnetic parts of an apparatus, mechanical rotates coder is disturbed to a few environments (like the light, magnetic field) the influence is minor.

2.Magnetism rotates coder

Magnetism rotates coder is one kind uses magnetic principle to detect the sensor of buy of dislocation coming back, basically code by magnetism dish, magnetic sensor and read take circuit composition. Magnetic encode dish it is installation is rotating the disc on the component, have above specific permutation magnetic pole. Magnetic induction parts of an apparatus includes sensor of suddenly Er effect or magnetic sensor normally array, use at detecting magnetic encode dish on the change of magnetic field. Read take circuit to receive magnetic sensor signal, change its to rotate the angle of the component or position are believed breath.

Should rotate when the component is rotational, magnetism codes dish of magnetic field that go up can change subsequently, magnetic sensor can the induction changes to these magnetic field. Magnetic sensor the signal of generation takes circuit processing through reading, changeover is angle or positional information. Read the signal after taking circuit to will be changed to undertake decipher, get accurate whirl component position.

Magnetism rotates coder has very tall precision, can offer arrive accurately micron or more the positional information of subsection. Because magnetic principle does not get the light or electromagnetism disturbing influence, magnetism rotates coder has good interference rejection capacity.

Magnetic encode dish with sensor the response between is quick, make magnetism rotates coder applies to high speed to rotate the position of the component detects. Compare at mechanical coder, magnetism rotates coder is had be able to bear or endure the characteristic of environmental interference and high accuracy, because it does not have machinery to contact a part, decreased to wear away the possibility with breakdown.

3.Optics rotates coder

Optics rotates coder is one kind uses optical principle to detect the sensor of buy of dislocation coming back, basically code by optics dish, optical sensor and read take circuit composition. Optical encode dish it is installation is rotating the disc on the component, there is quarter to have the optical line of encode or pattern above, be like pervious to light or not pervious to light groove aperture. Optical sensor include optical sensor array or sensor of optical Huo Er normally, use at check photometry to code dish of optical signal that go up. Read take circuit to receive optical sensor signal, change its to rotate the angle of the component or position are believed breath.

Should rotate when the component is rotational, optics codes signal can change dish of optics that go up subsequently, optical induction parts of an apparatus can read the change that takes these optical signal. The signal repass that optical induction parts of an apparatus produces is read after taking circuit to handle, can change cease for angle or positional letter. Read take circuit to be able to undertake the signal after changeover decipher, get accurate whirl component position.

Optics rotates coder can be offerred achieve micron or more the positional information of subsection, have very tall precision. Optics codes Pan Heguang learns sensor the response between is quick, make optics rotates coder applies to high speed to rotate the position of the component detects.

As a result of optical sensor of dispute contact, because this optics rotates to coder won’t be contacted because of machinery and get,wear away or breakdown, have longer service life. Optical principle also makes optics rotates coder has better interference rejection capacity to magnetism and electromagnetism interference.

4.Capacitance rotates coder

Capacitance rotates coder is one kind uses capacitance principle to detect the sensor of buy of dislocation coming back, it normally by fixed capacitance array, rotate capacitance dish and read take circuit composition. Fixed capacitance array is to secure a group of capacitor on fixed component, form matrix or circle normally. Rotate capacitance dish it is installation is rotating the capacitor on the component, its capacity can change as the change of buy of dislocation coming back. Read take circuit to receive fixed capacitance array and rotate capacitance dish the capacitance between changes, it is its changeover angle or positional information.

Should rotate capacitance dish when roll, with fixed capacitance array the value meets the capacitance between be changed as the change of buy of dislocation coming back. Read the change that takes circuit to be worth through gauging electric capacity, can rotate certainly the angle of the component or positional information. Read the electric capacity that takes circuit to will be measured to be worth signal of word of changeover amount to or imitate signal, use in order to supply a system.

Capacitance rotates coder has very tall precision, can offer micron or more the positional information of subsection. Because capacitance rotates,the working principle of coder does not need mechanical contact, because this has the character that is not contact, decreased to wear away the possibility with breakdown. The quick response that capacitance changes makes capacitance rotates coder applies to high speed to rotate the position of the component detects.

Because capacitance change gets the influence of exterior interference is minor, capacitance rotates coder has better interference rejection capacity. A few capacitance rotate coder has programmable character, can get used to diverse applied demand through setting and calibration.

Rotate the choice of coder considers essential factor

Because rotate coder is quite diversiform, and have different character, because this should come according to effective demand of application,the choice rotates coder.

The precision that in answering to decide application first above all, measures to the position or angle asks, of different type rotate coder has distinct precision range, if need high accuracy to measure, should choose the coder with taller precision. In addition, the rotate speed of the component should rotate in consideration application, a few rotate the application that coder rotates to high speed is more applicable, and it is better that a few measure the effect accurately below to low rate.

Those who apply an environment is different, to rotating the requirement of coder also differs, because this needs consideration application,be like in the environment temperature, humidity, vibration and caustic wait for an element, those who choose to be able to get used to specific environment is durable model coder. To needing to be in environment of senior officer faze issues used application, the whirl that should choose to have capacity of good interference rejection coder, be like magnetism or optical coder. Installation means to rotating coder also has main effect, include to secure space of means, installation and installation position, in order to ensure coder can correct and install conveniently rotate on the component.

In addition, still require a basis budget and performance demand, choose those who accord with cost effectiveness to rotate coder, want to consider to purchase cost not only, the consideration is safeguarded and change even cost. A few advanced whirl code appliance has communication interface (like RS-485, SPI and SSI) , can undertake with other parts of an apparatus or system data switch is mixed compositive, can expand its use limits and functional sex so. Of course, the whirl that chooses well-known trademark coder, have higher reliability and quality to assure, and can win better after service and technical support.

Rotate coder is in design and the note in installing a process
Rotate in application when coder, common problem includes installation and precision problem, interference problem, calibration problem to wait, this is in design and installation process, must special attention, rotate in order to promote the accuracy of coder.

Need to consider to rotate above all the precision problem of coder, if rotate,the precision of coder does not accord with applied demand, will bring about measure not accurate. The means of settlement is the coder that should choose to accord with precision to ask, have calibration and examination regularly. The coder of use high accuracy, optimize setting and control system, reduce machinery to swing wait for a method to be able to improve precision problem.

In addition, interference also is quite common problem, ministry of its China and foreign countries is disturbed (if electromagnetism interference, light is disturbed) to rotating the normal motion guild of coder causes an effect, bring about measure break allow or produce an error. Should use the coder that has capacity of good interference rejection right now, avoid to be coder installation near interference source, it is OK to increase screen measure, use interference to restrain a technology to wait reduce interference problem.

Even if chose to rotate suitably coder, but it is important that installation and calibration issue still fit, the installation of coder or calibration are incorrect, will bring about measure not accurate or invalidation. Answer to undertake installation and calibration strictly according to installation manual when installation, ensure coder and rotate the component is opposite correctly neat and fixed and reliable, and undertake examination and calibration coder regularly, wear away in order to avoid and become loose.

If with rotate the system that coder corresponds appears join problem or communication failure, check communication interface and link line first please agreement of communication of whether correct join, examination and setting match, newer communication driver and software in order to solve communication problem.

Durable sex is to rotate the another consideration element of coder, the durable sex of some coder not beautiful, be affected easily by environmental element or mechanical wear, bring about function to drop or breakdown. Should choose to the environment is disturbed and be able to bear or endure right now the coder of mechanical wear, fixed undertake maintain and be checkinged, avoid to expose coder in harsh environment, add outfit protection cover and isolator to wait to be able to raise durable sex.

Overall and character, solve rotate the method of common problem includes coder the coder with right choice, optimize installation and calibration, increase interference rejection measure, regular examination and maintain etc. Discover a problem in time and take proper step, can ensure rotate of coder move to be stabilized with function normally.

Epilogue

Rotate the application of coder is quite wide, rotate in choice and application the need when coder notes the factor such as means of ability of element of precision requirement, speed requirement, environment, interference rejection, installation, communication interface, cost effectiveness, brand and dependability, answer to undertake strictly operating according to installation and service instruction when installation, undertake check and be maintenanced regularly, handle an issue in time, rotate in order to ensure coder can move normally, ability provides accurate place or angle measures information.

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