CIRCUIT POUR LA DECOMMUTATION ELECTRONIQUE DE L'ENROULEMENT STATORIQUE AUX MOTEURS COMMUTES ELECTRONIQUE

摘要

The invention relates to the circuit arrangement for electronic off-commutation of the stator winding in electronically commutated low-power motors. The aim of the invention is to control the reduction in the coil energy by the coil itself, irrespective of the commutation frequency and of the motor current, such that only small, defined voltage pulses are induced and the coil current falls continuously and completely to zero. This is achieved according to the invention in that two transistors are connected together in such a manner that the collector of one transistor is connected to the base of the second transistor, the collector of the second transistor is connected to the base of the first transistor, and two resistors are in each case inserted between the bases and emitters of the transistors, and a coupling element, which is connected in series with the transistors and resistors, is connected in parallel with the stator winding in such a manner that the components of the circuit arrangement are polarised inversely, that is to say in the reverse direction, when the stator winding is driven by a switching transistor. These two transistors have a different zone sequence.