Patent ID: 6600399
Filing Date: 2003-07-29
Classification: H01F,H02K,H04R

Abstract:
An electromagnetic transducer comprising:(a) a magnet assembly including at least one magnet having an axial magnetization; the magnet assembly including first and second opposed outer pole faces and a magnetic field that emanates radially outwardly in a direction transverse to the axial magnetization; and (b) a conductive drive coil having an outer size and an inner size; the coil having a height dimension and a width dimension, the width dimension being defined as the distance between the coil's inner and outer sizes; the drive coil's width dimension being at least as great as the height dimension; the drive coil being located in the radially emanating magnetic field of the magnet assembly; a space existing between the at least one magnet and the drive coil so that during use the drive coil is not in physical contact with the at least one magnet; the drive coil moving along an excursion path, at least a portion of the excursion path being located between the first and second outer pole faces; wherein, as assembled, the drive coil is mounted in close proximity to the magnet assembly such that relative axial motion may occur between them during use; wherein during use as a motor, an electric current is supplied to the coil, causing the coil and the magnets to move relative to one another; and wherein during use as a generator, external physical movement of the drive coil relative to the magnets causes production of a corresponding electric current in the drive coil.