Patent ID: 8624448
Filing Date: 2014-01-07
Classification: H02K

Abstract:
1. An electrodynamic linear oscillating motor powered by AC voltage applied to drive coils; the motor comprising: a stator system for generating a magnetic field, the stator system having a single annular disk-shaped permanent magnet, magnetized in an axial direction and having two end faces, with a ring-shaped pole disk made of magnetically soft material provided at each of the two end faces, each of the pole disks forming a magnet gap in conjunction with the annular disk-shaped permanent magnet; and an oscillating system concentrically mounted inside the stator system such that the oscillating system is movable in the axial direction between a center position and a displaced position, the oscillating system having at least one core constructed of magnetically soft material onto which two separate drive coils are wound, the two drive coils being arranged such that, when the oscillating system is in the center position, the two drive coils are each centered in one of the magnet gaps; wherein the annular disk-shaped permanent magnet has an inner diameter and an outer diameter, the pole disks have an inner diameter and an outer diameter, and the inner and outer diameters of the pole disks are identical to the inner and outer diameters of the annular disk-shaped permanent magnet; wherein the length of the core of the oscillating system along the axial direction is equal to the length of the stator system along the axial direction and, when the drive coils are de-energized, the oscillating system with the core and the two drive coils is returned to the center position by way of a reluctance force acting on the oscillating system, without use of a mechanical reset system; and wherein, during operation, the oscillating system oscillates at a frequency corresponding to a frequency of the AC voltage.