Tachogenerators have been employed in industry for many years and enable the control of machinery on your company's production line, where precise rotation speeds are desired. In appearance a tachogenerator takes the form of a small electric motor, but with a much higher specification. The device can be directly coupled, in-line, via a flexible coupling to a driven spindle or belt driven by means of a timing belt and pulley arrangement. Usually, it is coupled to the main drive motor for which control is required.
A tachogenerator operates using the process of inducing emfs by a permanent magnetic circuit into the windings of an iron cored rotor whilst this is revolving. An output at the terminals of the tachogenerator is an analogue DC voltage which is a precise function of rotation speed and is a constant for that model of tachogenerator. There are many different models available, from the REO110, which develops a voltage of 0.007v/rev or 7v/1000rpm, to the RE.O 588 which can develop 200v/1000rpm. In the middle we have the industry standard REO444R with a range of 6V - 60V/1000 RPM Ex Stock, with higher voltages available. This voltage is used to provide a speed feedback signal for the DC Power Drive or AC Inverter powering the main motor.
In this way the motor speed can be very accurately maintained.
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