Tachogenerator Information

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 RE.O 110, which develops a voltage of 0.007v/rev or 7v/1000rpm, to the RE.O 588 which can develop 200v/1000rpm. 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.

Radio Energie, the manufacturers of motors, tachogenerator and encoders, were established in 1928, quickly becoming one of the chief suppliers to the French government of generating equipment. Over the many years since, they have become one of the largest suppliers of tachogenerators worldwide. Our company began a relationship with Radio Energie in the early eighties to promote their products in the UK, complementing our core business of machine control systems, and in the twenty years since, we have become experts in the field of speed sensing.

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