Home > Detectors > Tachometers
Select Topic of Tachometers
Total : 2 files, Page 1 of 1 pages
332
times
Basic principles of tachometers
Tachometers can be used to measure speeds (of linear or rotary movement),
rates (per minute or per hour), or rates of flow (volumetric, etc.).
Pulses are fed to the tachometer at the frequency to be measured. A
scale factor is applied to produce readings of the desired type (linear
speeds, flow rates, etc.).
Crouzet/Syrelec tachometers operate on 2 different principles :
1 - The fixed time base principle, and
2 - The reciprocal principle
File size: 234.3 KB
File type: pdf
Last download: Fri May 11, 2012 05:42:56 PM
58
timesMAGNETIC COUPLING BETWEEN DC TACHOMETER AND MOTOR
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 cont rol. The effect of the tachometer dynamics on controller design
is discussed in terms of system poles and zeros.
File size: 104.45 KB
File type: pdf
Last download: Fri May 04, 2012 07:29:50 PM
