Application of AEAT-84AD value encoder in valve control-EEWORLD

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Most of the current valves are mechatronic designs, which can automatically control the valves through the circuit system; the circuit system realizes the control, feedback and adjustment of the valve opening, and achieves accurate positioning. The focus is on the accurate feedback of the valve position and the operation of the execution mechanical design, which is also the difficulty in the comprehensive design of mechatronics. Similarly, in the application of robotic arms, such as in the system control of the base, arm, arm or multi-axis, it is necessary to detect their position information in real time and transmit their position to the control center for processing; the position detector of the robotic arm requires a small size for better installation.

In valve control and robotic arm control, the position information of the valve and arm can be detected when the power is turned on after power failure without the movement of the valve and arm. To achieve this, a complete set of absolute encoders is required, which has more advantages in terms of measurement range and accuracy. AVAGO multi-turn absolute encoder AEAT-84AD series is very suitable for the above applications. Its advantages are small size, no battery required to retain position information, and the ability to detect position information immediately after power on.

1. AEAT-84AD Product Introduction

1. Multi-turn absolute encoder

Multi-turn absolute encoder www.elecfans.com

AEAT-84AD is a photoelectric encoder that uses transmission mode and detects multi-turn absolute values. Its basic components are a photoelectric transmitter, a photoelectric detector, and a module consisting of 6 or 7 gears. It currently provides 12-bit or 14-bit resolution accuracy; the smallest size is 55mm in diameter and 12.2mm in height; the operating temperature can be between -40 degrees and 125 degrees; the rotation speed can reach 12,000/minute; and it provides 2×4 signal and power connections. When working with ASAS-7000, it can output up to 30 bits of absolute value encoding.

The products can be well applied in semiconductor automation, industrial sewing machines, robots, valve control, etc.

2. Functional Block Diagram

Functional block diagram www.elecfans.com

Through the multiplexer signal MTMUX[2:0], the three-bit signal data MTDAT[2:0] corresponding to each gear is read out. For the output of the 7 gear sets, there are 7 sets of three-bit data available for reading, and the 14-bit Gray code output can be obtained by a lookup table or a simple calculation method. For the output of the 6 gear sets, the converted Gray code is 12 bits.

2. Application in valve control

In the mechatronic valve design, the controller controls the motor to perform valve control according to the requirements or commands input from the upper end, and feeds the position back to the controller through the absolute encoder, forming a closed-loop control system that can well realize the control, feedback and adjustment of the valve opening. In this system, no battery or storage component is required to retain the valve position information. After the system is powered on, the valve opening information can be directly obtained without the need for the valve to perform additional mechanical movements.

The multi-turn absolute encoder module has high resolution, high reliability, strong anti-interference ability, and a voltage range of 5 V. The module is small in size and easy to install, which simplifies the mechanical design and circuit design of the entire valve and makes the design of intelligent electric valves possible.

3. Application in Robotic Arm

Generally speaking, the feedback of the position information of each dimension of the robot arm requires an encoder to provide feedback. In the application of high-precision robot arms, such as semiconductor automation robot arms, it is also possible to consider working with ASAS-7000, which can provide up to 30 bits of multi-turn position information to provide the necessary feedback information for the precise control of the robot arm. For AEAT-84AD, it can detect motion information of 12,000 revolutions per minute and is very sensitive; the movement speed and other parameters of the robot arm can be calculated by reading the position information. The movement position of the multi-dimensional robot arm can be read by the main controller when it is powered on, which is a great advantage for incremental encoders.

For the design of robotic arms, AEAT-84AD has the advantages of high precision, high sensitivity, small size, modular design, etc., and can be better applied therein.

In the application of multi-turn photoelectric absolute encoder, since its position information does not need battery power or other storage, it can be easily read after the system is powered on. These advantages are unmatched by incremental encoders. Its high precision, high sensitivity, fast response, small size, modular design and other advantages can be well applied in valve control, mechanical arms, and high-precision position control components.

Tip: The design of this encoder needs to avoid dust pollution and be as airtight as possible.

Reference address：Application of AEAT-84AD value encoder in valve control

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