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A tachometer is an instrument used to measure the rotational speed of a shaft or disk, commonly employed in monitoring engines, motors, and powered equipment such as conveyors, mixers, and machine tools. These devices are integral to speed control circuits, often serving as feedback components to ensure accurate velocity monitoring.
Tachometers are powered by tachometer generators, which convert rotational speed into an isolated analog voltage signal, ideal for remote monitoring and velocity control applications. Tachometer generators operate by rotating an armature within a fixed magnetic field, inducing an electromotive force proportional to the speed of the rotating shaft. This voltage is then converted into a speed value via a connected voltmeter circuit.
DC tachometers, in particular, are valued for their linear speed/voltage relationship with minimal ripple. With a nearly pure DC output and no phase shift, they are ideal for precision integrator and velocity servo applications, making them highly effective as feedback transducers for fast-response servos and other devices. Additionally, DC tachometers are excellent for velocity damping in low-speed position servo applications.
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