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MAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR AND ITS EFFECT ON MOTION CONTROL
 

Summary: MAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR
AND ITS EFFECT ON MOTION CONTROL
Shorya Awtar
Kevin C. Craig
Department of Mechanical Engineering, Aeronautical Engineering and Mechanics
Rensselaer Polytechnic Institute, Troy, NY12180, USA
Abstract: This paper presents an accurate tachometer model that takes into account the
effect of magnetic coupling in a DC motor-tachometer assembly. Magnetic coupling
arises due to the presence of mutual inductance between the tachometer winding and the
motor winding (a weak transformer effect). Tachometer feedback is widely used for
servo-control of DC motors, which can suffer from closed-loop instability due to the
presence of compliant components in the drive system. It is essential to have an accurate
sensor model to predict and address these resonance related problems. The inadequacy of
the conventional tachometer model, which treats the DC tachometer as a `gain', is pointed
out. The exact tachometer model identified in this paper is incorporated in the modeling
of a system that has multiple flexible elements, and is used for parameter identification
and feedback motion control. The effect of the tachometer dynamics on controller design
is discussed in terms of system poles and zeros.
1. INTRODUCTION
Closed-loop servo control of DC motor-load systems

  

Source: Awtar, Shorya - Department of Mechanical Engineering, University of Michigan

 

Collections: Engineering