Designing Robust and Fault-Tolerant Motion-Control Feedback Systems


Posted on Feb 6, 2014

This article reviews basic servo systems and development of the fault-tolerant feedback systems for servo systems. Controller receiver circuit design, proper PC-board receiver circuit layout, and the encoder`s signal cable and termination are discussed. Additionally, various types of industrial feedback encoders are presented, along with


Designing Robust and Fault-Tolerant Motion-Control Feedback Systems
Click here to download the full size of the above Circuit.

the various types of faults that can develop in a servo feedback system. The key to robust operation in a system lies in the way it handles mechanical and electrical faults. This article discusses the design of a robust and fault-tolerant motion-control system whose feedback paths incorporate quadrature encoders. Modern automated systems incorporate closed-loop feedback for motion control. They typically include a servo system that consists of a motor driver and feedback elements combined in a manner that gives accurate and stable control over speed and position. The various system-level components of a typical servo system are illustrated in Figure 1. DC brushless motors are preferred for high-performance and high-speed applications. DC brush and stepper motors are suitable for low-speed and less-demanding applications. Brushless motors are assumed throughout this article. Such motors typically include a quadrature encoder on the end shaft that determines the shaft velocity and commutation point for controlling the motor`s coil-switching sequences (see sidebar, Feedback encoder types). A second quadrature encoder on the machine`s rotating shaft provides position data for that shaft, which generally differs from the motor-shaft position due to inaccuracies caused by backlash in the gearhead and lead-screw assemblies. Typical motion-controller cards and modules include a motion-control IC, a microprocessor, and a DSP or...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Simple RS 232 Level Converter
    10 Step Baby Gate Sequencer CD4017
    1KHz Square Wave Generator Circuit
    temperature sensor interfacing with 8051
    Measuring Inductors
    Infrared IR Illuminator DIY
    TRIAC
    With self-locking function of the forward start circuit



    Top