Abstract
ABSTRACT In DC machines commutation may be performed inside the rotor by means of commutating poles. This is the classical way which gives good performances in normal working but presents some limits for unsteady running conditions. This paper deals with a special commutation process, from the outside of rotor, which is achieved without commutating poles through an electronic circuit connected with the commutator. The device is easily drived from the actual rotor position and is able to adjust commutation to miscellaneous conditions. Besides driving versatility, such process allows the suppression of commutating poles whose size is about 20 per cent of main poles. The possible weight reduction is attractive. The paper presents theory and experiment on a classical DC machine with a lightly altered commutator at a level of some kW.
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