Rotary encoder

Abstract

The invention discloses a rotary encoder, which includes a bearing pedestal, wherein the bearing pedestal is used for supporting a rotating shaft through a first bearing and a second bearing which are arranged at an interval; an end cover and a circuit board are fixed with the bearing pedestal; M pairs of photoelectric sensors are arranged at the circuit board at intervals in the circumferential direction; each pair of photoelectric sensors are arranged at an interval in the radial direction of the circuit board; the rotating shaft penetrates the circuit board, and a coding disk correspondingto the circuit board is fixed at the end of the rotating shaft penetrating through the circuit board; N light shielding blocks are uniformly distributed on the edge of the coding disk in the circumferential direction; when the coding disk is rotated, the light shielding blocks can pass by the radial interval of each pair of the photoelectric sensors; the included angle between the two adjacent pairs of photoelectric sensors meets the condition of the formula X equals to a*360 / N +1, wherein the X is the included angle, a is a natural number, and N equals to the amount of the light shielding blocks; the bearing pedestal is provided with a sealing cover positioned on one side of the coding disk; the circuit board and the coding disk are positioned in the sealing cover; and a conducting wire via hole is formed in the sealing cover. The rotary encoder provided by the invention greatly improves the characteristics of antijamming and data reliability, and can meet the requirement for high-precision and high rotational speed measurement.

Description

technical field [0001] The invention relates to an encoder, in particular to a rotary encoder for measuring the high-precision rotating speed of a mechanical shaft. Background technique [0002] In the prior art, an encoder for measuring the rotational speed of a mechanical shaft is generally an incremental encoder. The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and uses the number of pulses to represent the magnitude of the displacement. Rotate the incremental encoder to output pulses when turning, and know its position through the counting device. When the encoder does not move or the power fails, it relies on the internal memory of the counting device to remember the position. In this way, when the power is cut off, the encoder cannot move in any way, and when the power is on, the encoder cannot lose pulses due to interference during the pulse output process, otherwise, t...

AI Technical Summary

Problems solved by technology

In this way, when the power is cut off, the encoder cannot move in any way, and when the power is on, the encoder cannot lose pulses due to interference during the pulse output process, otherwise, the zero point of the counting device memory will shift, and this deviation There is no way to know the amount of displacement, only after the wrong production results appear

Also, incremental pulses are virtual, and the number of pulses collected is limited, so the measurement accuracy is not high

On the other hand, the structure of the rotary incremental encoder is more complicated

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