Magnetic circuit arrangement for a transducer

A magnetic circuit arrangement for converting electrical energy into mechanical energy and/or vice versa, said magnetic circuit arrangement comprising:

• a first armature, fixed to a first vibrating flow tube of a transducer;
• a second armature, fixed to a second vibrating flow tube of the transducer;
• at least a first coil, traversed in operation by a current, said first coil and at least said first armature interacting via a first magnetic field;
• a holder for said first coil, said holder being fixed to said first and second flow tubes;
• wherein:
• each of said first and second armatures is cup-shaped.

A magnetic circuit arrangement for converting electrical energy into mechanical energy and/or vice versa, said magnetic circuit arrangement comprising;

• a first armature, fixed to a first vibrating flow tube of a transducer;
• a second armature, fixed to a second vibrating flow tube of the transducer;
• at least a first coil, traversed in operation by a current, said first coil and at least said first armature interacting via a first magnetic field;
• a holder for said first coil, said holder being fixed to said first and second flow tubes;
• and
• wherein the first and second flow tubes form a double flow tube configuration having an imaginary middle plane located between said first and said second flow tubes, said middle plane corresponds to a plane of symmetry of said double flow tube configuration;
• and
• wherein the first coil is fixed to said holder such that a central axis of the first coil is essentially perpendicular to said imaginary middle plane of said double flow tube.

A magnetic circuit arrangement for converting electrical energy into mechanical energy and/or vice versa, said magnetic circuit arrangement comprising:

• a first armature and a second armature, said first armature being fixed to a first vibrating flow tube of a transducer, said second armature being fixed to a second vibrating flow tube of said transducer;
• a first coil and a second coil, in operation each of said coils being traversed by a current, said first coil and said first armature interacting via a first magnetic field;
• said second coil and said second armature interacting via a second magnetic field;
• and
• a holder for said first and second coil, said holder being fixed to said first and second flow tubes.