Fault self-diagnosis method for encoder in servo driving system

Abstract

The invention discloses a fault self-diagnosis method for an encoder in a servo driving system. Closed loop self-diagnosis and open loop self-diagnosis for encoder faults are achieved by detecting an output signal of the encoder in real time. A servo controller in the servo driving system receives a UVW signal and / or an ABZ signal output by the encoder in real time, the position information of a motor rotor is obtained through the UVW signal and / or the ABZ signal received in real time, and accordingly the operation state of the encoder is detected in real time. Once the encoder breaks down, the encoder is shut down and errors are reported, and the situation that the operation of a motor is affected due to the fact that the signals are lost because of the encoder faults and serious consequences caused by the encoder faults are avoided. In addition, closed loop self-diagnosis and open loop self-diagnosis can be achieved, real-time protection can be carried out under the situation of loading operation of the servo driving system, and the encoder can be detected when the motor has no load.

Description

technical field [0001] The invention relates to a self-diagnosing method for a fault in a servo drive system, in particular to a self-diagnosing method for an encoder fault in a servo drive system with an incremental encoder. Background technique [0002] The incremental encoder has been widely used in the servo drive system as the position sensor of the permanent magnet synchronous motor. The servo controller in the servo drive system obtains the permanent magnet position according to the ABZ signal and / or UVW signal fed back by the incremental encoder. The position information of the rotor of the synchronous motor is used to perform the FOC algorithm to control the operation of the motor. However, before or during the operation of the incremental encoder, faults such as damage to the original sensor, loss of the Z-phase signal, and UVW signal error may occur, which may even further cause the work of the servo drive system to be disordered. In the current servo drive syste...

AI Technical Summary

Problems solved by technology

However, the incremental encoder may have faults such as damage to the original sensor, loss of Z-phase signal, and UVW signal error before or during operation, which may even further lead to work disorder of the servo drive system

In the current servo drive system, there is no real-time detection, diagnosis, and control of these encoder faults, and there are loopholes in the safety and accuracy of the system operation.

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