Servo Encoder Interface Fault Detection for Reliable Motor Control
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Solution Overview
Problem
Existing servo systems using hardware-based encoder communication interfaces face challenges in detecting hardware failures, leading to potential reliability issues and increased costs due to redundancy, which complicates achieving high safety levels.
Innovation Solution
A servo system with a processor that compares rotation information directly received from an encoder with information input through a hardware-based encoder communication interface, diagnosing failures and taking emergency measures to ensure reliability without significant cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy of encoder communication interface using hardware is provided to detect hardware failures, then reliability is improved, but cost and installation area increase
Solution Approach 1:
The patent creates a virtual copy of the encoder communication path by having the processor receive rotation information through two different routes: directly from the encoder and through the hardware-based encoder communication interface. By comparing these two copies of the same data, the system can detect hardware failures without duplicating the physical hardware interface, thus avoiding increased cost and installation area while maintaining high reliability
Solution Approach 2:
The system implements a feedback mechanism where the processor continuously compares rotation information received directly from the encoder with information received through the hardware encoder communication interface. When discrepancies are detected, the system can diagnose hardware failures and take corrective actions, providing reliable failure detection using existing hardware resources rather than requiring additional redundant hardware
2Productivity
If hardware-based encoder communication interface is used for high-speed processing, then servo precision control is improved, but hardware failure detection capability deteriorates
Solution Approach 1:
The processor acts as an intermediary that receives rotation information through dual paths: directly from the encoder and through the hardware-based encoder communication interface. This intermediary position allows the processor to compare the two data streams and detect hardware failures while maintaining the high-speed processing capability of the hardware interface, thus resolving the contradiction between speed and failure detection capability
Data Source
AI summary
The servo system includes a servo motor, an encoder for detecting rotation information regarding the position and speed of the servo motor, and a servo amplifier for controlling the driving of the servo motor using the rotation information. The servo amplifier includes an encoder communication interface configured by hardware, a processor for calculating a control command to control the servo motor based on an operation command and the rotation information input through the encoder communication interface, and a control unit for controlling the driving of the servo motor based on the control command. Then, the processor compares the rotation information directly received from the encoder with the rotation information input through the encoder communication interface and diagnoses that there is a failure when both the pieces of rotation information do not match each other.