GHU920-0700-008 French BEI Encoder Customized Model

GHU920-0700-008 French BEI Encoder Customized Model

Encoder equipped with GORE-TEX valve meets the application requirements of high humidity environment

The ISA 698 encoder with GORE-TEX valve was initially used on rock drills in the mining industry. The new GORE-TEX valve can effectively prevent the aggravation of moisture inside the encoder. In addition, this encoder can release moisture unidirectionally, keeping the inside of the encoder dry and optimizing the working environment.

Encoders equipped with GORE-TEX valves can be used in humid environments with large temperature fluctuations, such as:

Drilling machines and mining equipment

● Wharf and ship cranes

● Mobile machinery and field applications

Steel mills or other industries that require water cooling

Industrial encoders with different flange designs

Recently, a Leine Linde customer in the South Korean steel industry requested to replace the existing encoder provided by another encoder manufacturer with Leine Linde's modernized inductive 600 series encoder, which supports PRFIBUS interface. The original encoder used an old-fashioned ø 65mm flange mounting base.

To simplify installation, engineer Leine Linde modified the flange design of the new encoder.

Harsh nut processing environment

One of Leine Linde's Danish clients is a food equipment manufacturer. Its special application is in the production of nut drying and baking equipment, with the end users located in the United States. When processing nuts, the dust is very severe, and the working environment of the encoder is very harsh.

To meet the requirements of dusty environments, our engineers have added an air inlet on the encoder housing to connect compressed air. The pressure inside the encoder can reach about 0.2 to 0.5 bar, effectively preventing dust particles from entering the encoder.

865 Duo Encoder for Low Temperature Heavy Load

The working temperature range of the Leine Linde standard encoder is very wide. The 800 series encoder includes multiple products with temperatures up to -40 º C and+100 º C.

But it still cannot meet the requirements of one of our users, whose product requires an encoder solution to support a working temperature of -50 º C.

Pneumatic splash proof stainless steel encoder

In food processing, some substances are truly acidic liquids. Cleaning agents and other corrosive substances are often present inside or around processing equipment, and the encoder on the equipment must be able to withstand occasional acidic liquids and withstand contact with such liquids.

Leine Linde has developed a waterproof and corrosion-resistant absolute encoder for one of the equipment manufacturers, which has been successfully applied in the positioning and synchronization of dairy packaging and filling machines.

GHU920-0700-008 French BEI Encoder Customized Model

How to achieve 4th harmonic of encoder

1、 Hardware implementation method

STM32 Timer Encoder Mode

Mode configuration: Select encoder mode 3 (TIM-EncoderMode_TI12) and count both the rising and falling edges of phase AB. In this mode, each AB phase cycle triggers 4 counts to achieve quadruple frequency.

Register setting: Configure the SMS [2:0] bit of the TIMx_SMCR register to 011 (encoder mode 3), and set the polarity of the TIMx_CCR register to dual channel rising edge trigger.

Counter direction determination: The counting direction is automatically adjusted based on the level combination of phase AB (counting up in forward direction and counting down in reverse direction), and the direction information is stored in the DIR bit of TIMx_CR1.

FPGA hardware logic implementation

Edge detection: Using Verilog/HDL programming, trigger counting for each edge (rising and falling) of phase AB, and use a state machine to determine direction. For example, the AB phase state change sequence (00 → 01 → 11 → 10) corresponds to forward rotation, and vice versa.

Differential signal processing: Adopting anti-interference design (such as magnetic ring filtering) to ensure high-speed signal stability.

2、 Software implementation method

External interrupt capture (without dedicated hardware support)

Interrupt trigger: Configure external interrupts for phase AB, set to dual edge trigger (rising edge+falling edge), and count the interrupt service program (ISR) triggered by each edge.

Direction judgment logic: Record the current AB phase level state in ISR, and determine the direction through the sequence of state changes (such as B phase low level turning forward when A phase rises).

Timer interrupt polling

High frequency sampling: Read the AB phase level in the timer interrupt (such as 10 μ s), and determine the edge change by comparing the previous and current states to achieve software quadruple frequency.

3、 Key configuration points

Filter settings

In STM32, input capture filters are configured through the IC1F and IC2F bits of TIMx_CMR1 to reduce noise interference. For example, set the filtering parameter to 1010 (sampling frequency is 1/16 of the input signal, N=5).

Automatic Reinstall Value (ARR)

Set TIMx_ARR to the maximum count value (such as 65535) to avoid overflow and data errors.

Signal anti-interference measures

Use twisted pair shielded cables, with the shielding layer grounded at one end;

The distance between the signal line and the power line should be ≥ 30cm to avoid electromagnetic interference.

4、 Performance optimization and precautions

Resolution Enhancement Calculation

If the original resolution of the encoder is P, the equivalent resolution after four harmonics is increased to 4P. For example, a 600PPR encoder is equivalent to 2400PPR after four harmonics, and the minimum detection angle is increased from 0.6 ° to 0.15 °.

Expansion of speed applicability range

Four fold frequency can lower the lower limit of M-method speed measurement, for example, the original requirement of 1000RPM for stable detection can be extended to 250RPM after four fold frequency.

GHU920-0700-008 French BEI Encoder Customized Model