Electrodynamic drive for a loudspeaker

Abstract

An electrodynamic drive for a loudspeaker, characterized in that the drive comprises: - at least one alternating magnetic circuit made of a soft magnetic core (2a / 2a', 2b / 2b', 3, 4), with at least one coil (7) arranged on its core, for supplying an amplifier signal. - at least one permanent magnetic circuit (2b / 2b', 3, 8, 9) or (8, 8', 9) with one or more segmented permanent magnets (9) with several ferromagnetic elements (3, 8, 8') for forming at least one air gap (14) for arranging a closed conductor loop (12) of the vibrating unit (10) therein. - a vibrating unit (10) with a closed conductor loop (12) which is rigidly coupled to the diaphragm (18) of the loudspeaker (15) via at least one diaphragm suspension (17) and at least one centering device (19) on the basket (16) of the loudspeaker. (15) is attached and arranged to be axially freely movable within the electrodynamic drive (1),wherein both magnetic circuits in the electrodynamic drive (1) are designed such that the closed conductor loop (12) of the oscillating unit (10) has electromagnetic coupling both with the alternating field magnetic circuit (2a / 2a', 2b / 2b', 3, 4), for inductive current supply to the closed conductor loop (12) of the oscillating unit (10), via an enclosure of one of its core parts in the form of a pole core (3), and also has electromagnetic coupling with the permanent field magnetic circuit (2b / 2b', 3, 8, 9) or (8, 8', 9), via an arrangement in its air gap (14) through which a constant magnetic field flows, such that an inductive current supply to the closed conductor loop (12) causes a mechanical deflection of the diaphragm (18) via the oscillating unit (10).