Early encoder mainly rotating transformer, rotating transformer IP value is high, can work under more severe environmental conditions, is because the shortcomings such as sensitive to electromagnetic interference and decoding complexity and gradually exit, but up to this day, still has its unique value, such as a hybrid car speed feedback, it is almost substitute, moreover in the conditions of the iron and steel industry, water conservancy and hydropower industry, rotating transformer due to its high protection grade also won a wide application. With the development of semiconductor technology, then there is hall sensors and photoelectric encoder, hall sensor precision is not high but price cheap, high temperature and not ability, only applicable in some low-end, it is because of photoelectric encoder overcomes the drawback of the front two encoder, it is high precision, strong anti-interference ability, simple easy to use interface and thus obtain the widespread application.

More than the sichuan

Tamagawa encoder is professional manufacturers, the main production rotating transformer and incremental, try to type encoder. Products are widely used in aerospace defense industry, automobile manufacturing, mining equipment, metallurgy, water conservancy and hydropower, shipping and so on all walks of life. The sole agent in China by ai which industrial equipment co., LTD. For its products in mainland China sales, service, technical consultation, etc.

Below with rotating transformer, incremental encoder, absolute encoder as an example to introduce them one by one.

Rotating transformer

Referred to as "spin variable is a kind of output voltage varies with the rotor Angle signal components. When the excitation winding with a certain frequency ac voltage excitation, voltage amplitude of the output winding and the rotor Angle is cosine function relation, or maintain a certain proportion relations, or a linear relationship within a certain range Angle and corner.

According to excitation methods of points, the sichuan BRT and BRX rotating transformer points two kinds, BRT is single-phase excitation two-phase output; BRX is bipolar single-phase output field. Users often choose BRT type rotary changed, because it is easy to be decoded.

Become generally pay attention to when using 3 parameters: the transmission ratio, excitation voltage, excitation frequency. Transmission ratio into refers to the output voltage and input voltage ratio, type of the excitation voltage is lower winding in voltage, as much of the sichuan rotating transformer, promised to excitation voltage can from 3 v to 1.2 times the rated voltage.

"Chuan for his spin became more developed special decoding chip AU6802N1 and ai and the company have a ready-made decoding board available, decoder board support 10 KHZ excitation frequency, the transmission ratio of 0.5, can provide incremental and at the same time try to type signal output, incremental output 1024 c/T, using long term output; Try to type o 12 / T, output using photoelectric isolation, can according to customer's need to be adjusted when necessary. The transformed signal and the encoder.

Incremental encoder

Every turn unit, it outputs a pulse encoder, called incremental;

Incremental encoder output signal of the sichuan had long term output, open set output, the output voltage, complementary push-pull output four ways. The mechanical structure on the points of hollow shaft and belt shaft encoder, can satisfy all sorts of different applications.

The sichuan encoder more models of many, is currently used in the elevator traction machine, door machine, servo motor, CNC equipment, etc.

Try to type encoder

Always with a point as the reference origin, cable output shaft encoder is the current position deviation interval data information of the origin, is said to type encoder. For example, a 10 output of BCD encoder resolution of 360 c/T, then each unit corresponding to 1 °, if axis deviating from the origin of a unit, which is in the position of 1 °, the output 0000 0001, 00 if deviation from 50 °, which is at 50 °, the output is 00 0101 0000. Always try to type encoder output current location information. Due to the characteristics of such as type encoder is very suitable for application in place of running track.

The sichuan to type encoder more models complete, from the output signal encoding to classification, BCD code, GRAY code and pure 2 hexadecimal code (PB) output; From the output to lines parallel output and serial output; From the resolution to differentiate have ranged from 8 to 36. The user can choose according to their own needs.

In addition to have a single rotary encoder and multi-turn, multi-turn meter circle number and single rotary regardless of the number of turns, the sichuan everything for single rotary type encoder can be up to 20, more than turning 16. Special chip output signal is made of serial transmission, after converted into parallel output signal, can be directly sent to DSP, MCU and FPGA for processing.

The output interface circuit

To do for type encoder resolution is not very high, generally suitable for using parallel output, this interface circuit is simple, and communication rate is high. Using parallel output of the encoder output circuits are mainly open collector (as shown in figure 1) and emitter follow two ways (as shown in figure 2). Open collector output mode client need to add to pull resistance, as shown in figure 1, shown in dotted lines; Emitter follow mode, should add pulldown resistor, as shown in figure 2 is shown in dotted lines.

Good engineering mechanical and electrical network

The output data from 1, 2, 22... 2 ⁿ bits of data, the user simply encoder directly read data from the data bus.

Parallel output due to occupy too much data line only by the low resolution encoder adopted, do not use parallel output and high precision encoders, and generally USES serial output, to save the output line. "Sichuan and provide more special serial parallel conversion chip, users can according to the communication protocol for programming, the serial output of encoder data into parallel output, the user read the encoder from the output of the conversion chip location data.

The sichuan company has AU5561 conversion chip and AU5688 two paragraphs, can support more than all the serial output of sichuan decoding of type encoder.

Is shown in figure 3, the interface circuit between the encoder and AU5561 conversion chip serial output of all the internal use ADM485 more or similar type encoder chip as the output, so on the user's entire decoding board need to be adopted and ADM485 compatible chip, as the transformation in the middle of the interface circuit chip. Figure 4 is the entire system interface circuit diagrams, can be seen from the diagram, the chip can be output 40, the user can choose according to their own CPU communication mode, 16-bit and 32-bit MCU or DSP mode. The user can read the encoder data from user data on the bus. The chip can be used as a TS5647, TS5648, TS5667, TS5668, TS5669 model transformation to the best of the type of encoder. By using this circuit, baud rate is 2.5 MB/S. More suitable for real-time control in high speed.