Disconnection detection method for incremental encoders with UVW pole signals and circuit thereof

Abstract

The invention discloses a disconnection detection method for incremental encoders with UVW pole signals and a method thereof. Three D flip-flops sequentially connected in series are adopted. The input of the first D flip-flop is connected with high level, and the output of the third D flip-flop is disconnection error output. U, V and W signals are taken as clock signals of the three D flip-flops. A phase-A or phase-B signal is used as a reset signal for the three D flip-flops. When the phase-A or phase-B signal is disconnected, a high-level signal is transmitted to the output of the third D flip-flop after trigger of the U, V and W signals, and then, phase-A or phase-B signal disconnection is detected out. By adopting the scheme, disconnection detection of phase A or phase B of an incremental encoder with UVW pole signals can be realized with use of only three D flip-flops. The detection method and the circuit are very simple and highly practical.

Description

technical field [0001] The invention belongs to the field of encoder signal processing, and in particular relates to an incremental encoder disconnection detection method and a circuit thereof. Background technique [0002] Incremental encoder is a kind of sensor that converts the displacement of rotation into digital pulse output. Because of its durability, strong anti-interference ability, high precision, and simple use, it has important applications in many fields, especially in the field of motion control. [0003] There are two types of incremental encoders, one is ABZ signal with UVW magnetic pole signal, and the other is only ABZ signal, in which the A phase and B phase signals are two pulse signals that are orthogonal to each other, and the Z phase is the origin signal , The UVW phase is 3 magnetic pole signals with a phase difference of 120 degrees. The application of the present invention is aimed at an incremental encoder with UVW magnetic pole signals. [0004...

AI Technical Summary

Problems solved by technology

[0004] In the control situation with incremental encoder as feedback, when A phase or B phase disconnection occurs, if the alarm cannot be given quickly, it is very likely to cause control errors, which will seriously cause mechanical damage and casualties. Therefore, Encoder disconnection detection is very important to the system

[0005] The existing incremental encoder disconnection detection method with UVW magnetic pole signal, most of the steps are cumbersome, the detection circuit is complicated, and the practicability is poor

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