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 pdf fileBasic 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

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Last download: Wed Feb 22, 2017 09:42:40 PM


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 pdf fileMAGNETIC 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.

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Last download: Sun Nov 27, 2016 01:25:23 AM


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 pdf fileTachometers
Electronic tachometers work by counting pulses generated by the ignition system, ... tachometer know how many pulses are sent per each engine revolution.

File size: 1.4 MB
File type: pdf
Last download: Wed Feb 15, 2017 11:11:52 PM


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