CN102486383A - An Electrically Retentive Multi-turn Absolute Encoder - Google Patents

Abstract

The invention relates to a power-maintained multi-circle absolute value encoder. A power-maintained multi-circle absolute value encoder is always one of the most important technologies in industrial control and for the industrial control, encoder application has practical significance. However, it is critical to know how to accurately apply an encoder technology to reduce losses in the industrial control. According to the provided encoder, a low power consumption multi-circle absolute value technology is employed, so that it can be ensured that a vital role can be played in whole industrial control.

Description

An Electrically Retentive Multi-turn Absolute Encoder

technical field

The present invention relates to the application of the control system, specifically to the gate opening and height control, height signal hand, independent from the double circuit, redundant control. It is suitable for the measurement of the lifting height of various lifting equipment, the depth of coal mines, the underwater depth of ships, and the lifting height of dam gates. 

Background technique

At present, the traditional multi-turn absolute encoder is completed by a photoelectric code disc and a micro reducer, and an electronic photoelectric multi-turn absolute encoder with a photoelectric encoder and a single-chip microcomputer is also used. Traditional photoelectric encoder code discs are made of glass, metal, and plastic. The glass code disc is made of thin scribed lines deposited on glass. Its thermal stability and accuracy can meet common standards and general requirements, but it is easily broken. The metal code disc is directly engraved with pass and no pass, and is not easy to break. However, due to the certain thickness of the metal, the accuracy is limited, and its thermal stability is an order of magnitude worse than that of the glass code disc. The plastic code disc is economical, its cost is low, and its accuracy and high temperature resistance cannot meet the high requirements. In addition, the photoelectric encoder calculates the accuracy by engraving lines on the code disc, so the higher the accuracy, the larger the code disc, the larger the encoder volume, and the accuracy is not continuous. At the same time, the installation of traditional encoders is relatively complicated, and due to the lateral pull of the shaft center, if there is a deviation in the installation concentricity, the higher the speed of the spindle rotation, the greater the horizontal pulling force, the higher the deflection, and the damage to the encoder. rate also increased. The workpieces (gears, belts) installed in indirect transmission will wear out more often. During processing, the tightness of the belt between the motor and the main shaft affects the processing accuracy. If it is too loose, the precision will be poor and it will easily cause the problem of tool breakage. If it is too tight, the horizontal tension will be increased and the main shaft will be worn faster. Low protection, high maintenance, low IP level. When subjected to external impact, it is easily damaged. The maximum speed is usually marked as 6000rpm, but in fact it is often not reached, and some problems will occur when it runs to 3000rpm.

For single-turn absolute encoders, when the rotation exceeds 360 degrees, the code returns to the origin, which does not meet the principle of unique absolute codes. Such encoders can only be used for measurements within the rotation range of 360 degrees. If To measure rotations beyond 360 degrees, single-turn absolute encoders are not sufficient. A general incremental encoder outputs two A, B pulse signals, and a Z (L) zero position signal. The A and B pulses have a phase angle of 90 degrees, and the position, angle and number of turns can be known through pulse counting. , The positive and negative rotation can be known through the leading or lagging of the A and B pulse signals. After a power failure, the counting must be restarted from the agreed reference. When the incremental encoder measures the position, angle and number of turns, post-processing is required, and a "reset" operation is required when the power is turned on again, and there is no function of memorizing the absolute position of the device. With the improvement of the degree of automation in our country, the traditional encoder can no longer meet our needs, and a new type of encoder is urgently needed.

Contents of the invention

The purpose of the present invention is to solve the problem of many discomforts existing in the current measurement of the lifting height of various lifting equipment, the depth of coal mines, the underwater depth of ships, and the lifting height of dam gates, and to provide an extremely suitable solution for equipment height, depth, and gate opening. Degree and other control systems.

The technical solution adopted to solve the above problems is:

An electric holding multi-turn absolute value encoder, including a single-chip microcomputer, a ferroelectric memory, an integrated Hall element, a 485 communication, a linkage shaft, a permanent magnet, a magnetic encoder, and a charging power supply management; The encoder conducts phases, the linkage shaft and permanent magnets conduct phases with the Hall elements, and the ferroelectric memory, 485 communication, and integrated Hall elements are connected to the single-chip microcomputer respectively, and output a standard current of 4-20mA.             

The content 1 of the above measurement schematic diagram is shown in Figure 1. The magnetoelectric encoder adopts the magnetoelectric design. The advantage of the multi-turn encoder is that the measurement range is large, and the actual use is often richer. It is not necessary to find a zero point during installation, and a certain An intermediate position is used as the starting point, and the absolute position of the rotor is generated and provided by the change of the magnetic field through the permanent magnet and the linkage shaft of the magnetic induction device.

The content 2 of the above measurement principle diagram is shown in Figure 2. When the magnet and the linkage shaft are used to rotate, the integrated Hall element is used as the angle sensor, the resolution is 4096 lines, and the power consumption is reduced to 1/10 of the traditional optical encoder , there is no need for continuous power supply, the sampling interval is set to 2 times the actual speed.

The above hardware structure diagram is shown in Figure 3, including single-chip processor chip, ferroelectric memory, integrated Hall element, 485 communication module and charging power management. The ferroelectric memory, the 485 communication module and the integrated Hall element are respectively connected with the single-chip processor. One end of the single-chip processor output terminal is a standard current of 4-20mA.

Working principle of the present invention:

The electric holding multi-turn absolute value encoder is introduced from the current academic frontier traditional encoder technology and implemented by adding a low power consumption design. The structure schematic diagram of the electric holding multi-turn absolute value encoder system of the present invention is shown in Fig. 1, which is composed of a permanent magnet, a linkage shaft and a magnetic encoder. The measurement schematic diagram is shown in Figure 2, which is composed of a permanent magnet, a linkage shaft and an integrated Hall element as an angle sensor. As shown in the schematic diagram 3 of the hardware structure diagram, the signal collected by the Hall element sensor is processed by the single-chip microcomputer and stored in the flash. Quantitative output, easy to connect to all types of PLC, on-site multimeter + notebook can be debugged, the most convenient, accurate and reliable absolute value multi-turn encoder on the market at present. At the same time, the system has the following technical features: 1. 4-20mA analog output and RS-485 digital communication output are optional. 2. It is intelligent and can be set. Because of the magnetic induction and electronic counting methods, the number of turns can be set arbitrarily, and the output directly corresponds to the measurement range, absolute angle or position. 3. The encoder has an external set line, which can set any pre-set position value externally. 4. The RS-485 output is a bus type, and multiple addresses and baud rates can be set, and multiple encoders can be connected to a PLC communication port at the same time, and the connection cost is low. 5. The price is the lowest among the absolute value multi-turn encoders of the same industrial grade. 5. Gate opening, height lifting, and tower cranes are used in batches for a long time. 6. The internal magnetic encoder is used, and the power is maintained, and the record of the number of turns will not be affected by power failure. 7. Built-in signal conversion, 4-20mA analog current and RS-485 output, easy to connect various devices. 8. Host computer software setting, multi-purpose, multi-function, directly corresponding to single-turn multi-turn angle, multi-turn length, rotation and translation speed measurement. 9. Arbitrary setting and fine-tuning of the corresponding value of 4mA and 20mA; direction setting; external setting to set the preset position, easy installation, no need to change. 10. Internal magnetic encoder, electric holding, fully digital recording value, high linearity, high accuracy, no temperature and mechanical influence on the signal, and the zero point drift of signal interference is extremely small.

Advantages of the present invention:

1. Low cost

The traditional optical multi-turn encoder uses a miniature reducer to measure the multi-turn encoding, but the cost of this device is very high when the accuracy is guaranteed, and the process requirements are also very strict, and the processing is complicated; the new magnetic encoder uses electronic counting, and the process is simple , only need to add a magnet on the top of the shaft, the cost is low.

2. Wide measurement range

The traditional optical multi-turn encoder uses a micro reducer to measure multi-turn encoding, and the maximum range is limited; the new magnetic encoder uses electronic counting, and the range is unlimited.

3. High measurement accuracy

The traditional optical multi-turn encoder uses a micro reducer to measure the multi-turn encoding, which relies heavily on the reducer, and the consistency in the production process is not good, especially for many domestic products, the accuracy is poor; the new magnetic encoder uses electronic counting, and the accuracy depends on Linear accuracy of the magnetic encoder, no accuracy loss after multiple turns.

4. Low power consumption, continuous work for more than one year after power failure

The traditional optical multi-turn encoder does not lose the number of turns after power failure; the new magnetic encoder is powered by a rechargeable battery after power failure, measures the number of turns after power failure, and fully charges the battery after power on. The power consumption does not exceed 500 microamperes, and it can work continuously for one year with a normal 120mAh rechargeable battery. The data is stored in flash, and it can be kept for 10 years after power failure.

The design of the invention is scientific, reasonable and full of creativity, and fully embodies the advantages that traditional encoders do not have, such as the flexibility, convenience, easy operation and running accuracy of electric holding multi-turn absolute value encoders. The efficiency of the encoder is improved, its power consumption is greatly reduced, and the utility model has strong practicability, compact overall structure, less consumables, long service life, low cost, stable and reliable performance, and convenient maintenance. The present invention is suitable for popularization and use in industrial sectors.

Description of drawings

Fig. 1 is a schematic diagram of measurement principle 1 of the present invention.

Fig. 2 is a schematic diagram of measurement principle 2 of the present invention.

Fig. 3 is a schematic diagram of the hardware structure of the present invention.

Detailed ways

An electric holding multi-turn absolute value encoder, which includes a single-chip microcomputer 8, a ferroelectric memory 7, an integrated Hall element 4, 485 communication 9, a linkage shaft 1, a permanent magnet 2, a magnetic encoder 3, a charging power management 5, 4-20mA standard current 6; the linkage shaft 1 and the permanent magnet 2 conduct with the magnetic encoder 3, as shown in Figure 1, and the linkage shaft 1 and the permanent magnet 2 conduct with the Hall element 4, as shown in Figure 2 , ferroelectric memory 7, 485 communication 9, and integrated Hall element 4 are respectively connected with single-chip microcomputer 8, and output 4-20mA standard current 6, as shown in FIG. 3 .

Claims (1)

1. an electricity keeps many circle absolute value encoders, comprises single-chip microcomputer (8), ferroelectric class storer (7), integrated hall element (4), 485 communications (9), universal driving shaft (1), permanent magnet (2), magnetic coder (3), charge power supply management (5), 4-20mA normalized current (6); It is characterized in that:

Said universal driving shaft (1) conducts with magnetic coder (3) with permanent magnet (2) mutually, and measures range is wide, and novel magnetic coder adopts electronic counting, and range ability is unrestricted;

Adopt electronic counting, precision depends on the line precision of magnetic coder, many circle no losss of significance in back;

Universal driving shaft (1) conducts with integrated hall element (4) with permanent magnet (2) mutually; Here adopt integrated hall element as angular transducer; Resolution is 4096 lines, the traditional optical of comparing scrambler, and power consumption is reduced to original 1/10; Do not have simultaneously the situation of power supply continuously, sampling time interval is that 2 times of actual speed can be accomplished;

Ferroelectric type of storer (7), 485 communications (9), integrated hall element (4) are connected with single-chip microcomputer (8) respectively, and export 4-20mA normalized current (6);

Performance advantage with analog quantity digital quantity dual output has the output of 4-20mA analog quantity, the output of RS-485 digital quantity simultaneously, and is low in energy consumption; Outage back continuous working was recharged powered battery, the number of turns of rotating after the metering power down after adopt novel magnetic coder outage back more than 1 year; After powering on battery is full of, can accomplishes that at present system power dissipation is no more than 500 microamperes, use the rechargeable battery of common 120 MAHs can continuous working 1 year; Data are to store among the flash, keep 10 years after the power down.

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