The application characteristics of absolute type encoder

Rotating turns output pulse incremental encoder, through the CPU count to know its position, when the encoder or power failure, rely on counting device's internal memory to remember the location. So, after the power outage, there cannot be any movement, encoder when calls work, in the process of the encoder output pulse, also cannot be a pulse interference and loss, or counting device memory zero point will be offset, and the amount of the offset is don't know, can know only after an error.

Printers, scanners, for example, the positioning of the principle is to use incremental encoder, the computer, we can hear the motor noise transmission, which is CPU is looking for a reference zero, then work.

Such an approach to some industrial projects more troublesome, even not allowed to change boot (boot after will know the correct location), and there was the emergence of the absolute encoder.

To the best of the encoder is determined by mechanical position of the uniqueness of each position, it does not need memory, don't need to find a reference point, and don't always count, when you need to know the motor position, what time to read it, don't need to calculate like incremental encoder. Encoders with a battery back-up in this way, even after power encoder can memory location information before power, greatly improved the use of the security and reliability of the absolute encoder type.

As a result of absolute encoder in the positioning obviously better than the incremental encoder, has been increasingly used in industrial control positioning. Is one of the most important application in high precision nc machine tool and the servo system. In western developed countries, the movement control is more focused on trajectory control, if use absolute encoder type will no doubt provide more convenient location information for control.

At present, more than the sichuan has launched up to 36 of the absolute encoder, including single rotary 20, more than turning 16. Can achieve 52 MHZ maximum response frequency. Can realize high speed and high precision real-time control.

Besides, on some of the high-power servo motor, due to the initialization time using ordinary incremental encoder measuring position error is bigger, so suitable for absolute value plus incremental encoder for pole position Angle, this can greatly improved the output torque, the more the sichuan has also introduced hybrid encoder. Its incremental output A, B, Z three-phase, absolute plant output 24, 11 single rotary, 13 multi-turn, can greatly the progress of the servo motor fixed position accuracy of initialization time. At the same time position control and speed of calculation is extremely convenient.