Commutatorless motor arrangement

Claim 1

A commutatorless motor arrangement comprising a commutatorless motor, an inverter connected to the motor for commutating the same in response to outputs from an associated control unit, electric supply means, and a direct current intermediate circuit connected between said supply means and said inverter, said intermediate circuit including a smoothing inductance across which a self-induced voltage appears in response to a reduction of the current in said intermediate circuit, a controllable rectifying component connected in parallel with said smoothing inductance and poled with respect to said inductance so as to cause said self-induced voltage to be applied across said rectifying component in the forward conducting direction thereof, and a series circuit connected across the output of said intermediate circuit, said series circuit including an uncontrolled rectifying component, and a capacitor serially connected to said uncontrolled rectifying component, said uncontrolled rectifying component also being connected to said controlled rectifying component so as to conjointly define therewith a series circuit path in parallel with said smoothing inductance, with the control terminal of said controllable rectifier coupled to said control unit whereby said inductance, uncontrolled rectifier and controlled rectifier comprise a part of a common commutation circuit for said inverter.