Universal engine

A universal driving is a Machine with D.C. current with excitation series: the rotor is connected in series with the field winding. The couple of the machine is independent of the direction of flow of the current (couple proportional to the square of the current) and can thus be fed in alternative course. To limit the eddy current which appear systematically in all the massive metal zones subjected to alternate magnetic fields, his Stator is laminated.

It holds its name owing to the fact that it can be fed indifferently in D.C. current or in Alternative course .

The universal engines are used in devices requiring a couple rather extremely, such as the food processors, the électroportatif Outillage of low power (to 1200 W) or the Aspirateur S.

The Speed of these engines depends on the value on the tension on food. In mode of alternative course, it can be easily regulated by an inexpensive device such as the gradator with phase (the same variator which is used to regulate the luminous intensity of the luminaries).

Disadvantages

Wear of the Brush S supplying the rotor, as in any machine with D.C. current.
the ruptures of contact successive, inherent in the operation of the unit Brush S-collector, generate parasite S in the and feeding circuit interference S electromagnetic S, Radioélectrique S, for much of other apparatuses: Television S, radio S, Telephone S.

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