The rotary encoder is an opto-mechatronic speed-displacement sensor. When the encoder shaft rotates and the grating disc rotates, the light cut out of the slit of the grating disc is received by the receiving element and an initial signal is generated. Germany is a well-known brand. The signal is processed by a follow-up circuit and a pulsed or encoded signal is output. It has the characteristics of small size, light weight, many varieties, full functions, large frequency response, high resolution, small torque, low energy consumption, stable performance and long service life.
Incremental encoders
When the incremental encoder rotates the shaft, it produces a corresponding phase output. Its judgment in the direction of rotation and the increase or decrease of the number of pulses need to be completed with the help of backward direction circuits and counters. Its calculation starting point can be set arbitrarily, which realizes the infinite accumulation and measurement of multiple turns. The Z-signal for each forward pulse can also be used as a reference mechanical mark. When the pulse is fixed and the resolution is required to be improved, the original pulse number can be doubled by two 90-degree phase difference signals A and B.
Absolute encoders
When the absolute value axis of the encoder rotates, there is a positioning code (binary, BCD code, etc.) corresponding to the positioning, and the change of the size of the positioning code can be judged whether it is a positive or reverse displacement, and the circuit is not positioned. The system has an absolute zero code, which can still accurately read out the code of the power-off or shutdown position when the power-off or power-off time is re-measured after power-off or shutdown, and can accurately find the zero-bit code. In general, absolute encoders measure from 0 to 360 degrees, but special models can also be used for multiturn measurements.
Absolute encoders
Sine encoders are also incremental encoders, and their main feature is that the output signal is an analog sine waveform rather than a digital one. It appeared mainly to meet the needs of the electrical field - as a feedback detection element for electric motors. The encoder is based on the improvement of its dynamic characteristics compared to other systems. The feedback signal of the encoder must be able to provide a large number of pulses in order to ensure good control performance of the motor, especially in low-speed operation, with the traditional incremental encoder to generate a large number of pulses, which will cause problems when the motor rotates at high speed (6000rpm), making the signal difficult to transmit and process. In this way, the bandwidth required to process the signal to the servo motor (e.g., 10,000 pulses per revolution for the encoder) can easily exceed the MHz threshold; On the other hand, the use of analog signals can greatly reduce the aforementioned troubles and enable the simulation of a large number of pulses of the encoder. Thanks to the interpolation of the sine and cosine signals, it provides a method for calculating the rotation angle. This method yields a high multiple of the basic sinusoid, e.g. 1000,000 pulses per revolution, which can be obtained from 1024 sine wave encoders per revolution. As long as it is slightly greater than 100KHz, the bandwidth required to receive this signal is sufficient. Frequency doubling interpolation needs to be done by a quadratic system.
Our absolute encoders provide absolute code values for each axis position. Especially in position control, absolute encoders reduce the computational tasks of the controller and eliminate other additional inputs.
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