Tachogenerator

- An electromechanical generator
is a device capable of producing electrical power from mechanical energy usually the turning of a shaft?
- When not connected to a load resistance, generators will generate voltage roughly proportional to
shaft speed With precise construction and design generators can be built to
produce very precise voltages for certain ranges of shaft speeds making them
suited as measurement devices for shaft speed in mechanical equipment.
- A generator designed and constructed for this
use is called a tachometer or tachogenerator, By
measuring the voltage produced by a tachogenerator you can easily determine
the rotational speed of whatever it's mechanically
attached to since a tachogenerator cannot produce a voltage when it’s not
turning the zero cannot be live in this signal standard.
- Tachogenerators can also indicate the directions of rotation by the polarity of the output voltage, When a permanent-magnet
style DC generator’s rotational direction is reversed, the polarity of its output voltage will switch.
In measurement and control systems where the directional indication is needed
this provides an easy way to determine that.
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