What is to pay attention when selecting encoders?！

What is to pay attention when selecting encoders

 (A) Mechanical parts:
1. Measured length or angle measurement, measuring length how mechanically converted (some described above, such as do not know can call to discuss). Measured angle is 360 degrees (lap), or may be over 360 degrees (multi-turn). Production process is a rotation cycle work, or back and forth direction of the cycle work.
2. Install shaft forms a shaft connected by a flexible coupling type, or sleeve-type connector.
3. Use of the environment: dust, moisture, vibration, shock?
(B) the electrical part
Output connector receiving what part? 2. Signal form? 3. resolution requirements? 4. control requirements?
Photoelectric encoder:
1, the advantages: small size, precision, resolution of itself can be very high (currently the company through subdivision in diameter φ66 encoder can reach 54000cpr), non-contact and wear-free; the same species can detect angular displacement, but also detecting linear displacement conversion device help; Optical multi-turn absolute encoder can detect the linear displacement relatively long range (eg over 25 laps). Long life, free to install, rich interfaces in the form of reasonable prices. Mature technology, many years ago has been widely used at home and abroad.
2. Disadvantages: precision but under outdoor and harsh environments offer higher protection requirements; measuring linear displacement need to rely on mechanical devices to convert, we need to eliminate errors caused by mechanical backlash; detect orbiting objects insurmountable slip. Optical electronic ruler:
1. Advantages: Precision, itself a high degree of resolution (up to 0.005mm); moderate volume, direct measurement of linear displacement; non-contact and wear-free, broad measurement gap; affordable, rich interfaces form in domestic and foreign metal-cutting machinery industry get more applications (such as wire cutting, EDM, etc.).
2. Disadvantages: linear and angular measurement you want to use different varieties; restricted range (range more than 4m, expensive and difficult to manufacture), not suitable for the implementation of long-range displacement detection in harsh environments place. Static magnetism grid absolute encoder:
1. Advantages: Volume moderate, direct measurement of linear displacement, absolute digital encoder, the theoretical range is no limit; non-contact and wear-free, anti-poor environment, the 1000 meters underwater use; rich interfaces forms, diverse measuring mode; the price can still accept the . 2. Disadvantages: resolution of 1mm is not high; measuring linear and angle you want to use different varieties; suitable embodiment of displacement detection of the small fine (more than 260 mm).

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