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    • 3. 发明申请
    • IMPROVED MOVING COIL TRANSDUCER
    • 改进的移动线圈传感器
    • WO2003039192A1
    • 2003-05-08
    • PCT/GB2002/004927
    • 2002-10-31
    • ISIS INNOVATION LIMITEDBAILEY, Paul, Brian
    • BAILEY, Paul, Brian
    • H04R9/04
    • H04R9/04
    • A moving coil transducer which comprises a yoke, permanent magnet and pole piece which are assembled to form a magnet circuit leaving an air gap between two opposing surfaces of the yoke and pole piece for receiving the moving coil. The permanent magnet is positioned between other opposing surfaces of the yoke and pole piece, and its faces are not parallel. Thus the thickness of the magnet increases away from the air gap of the magnetic circuit. In an annular or toroidal design in which the pole piece, permanent magnet and yoke are all annular and define an annular air gap, the magnet may be of conical form, having a thickness which increases away from the air gap. The pole piece and yoke are correpondingly tapered at the portions which meet the permanent magnet. The use of the non-flat magnet allows more magnetic material to be included in the transducer without increasing the overall volume of the transducer. This results in an increased magnetic flux density in the air gap and thus an increase in power and/or efficiency.
    • 一种包括磁轭,永磁体和极片的运动线圈换能器,其被组装以形成磁体电路,在磁轭的两个相对表面和极片之间留下气隙,用于接收运动线圈。 永磁体位于磁轭和极片的其它相对的表面之间,并且其表面不平行。 因此,磁体的厚度从磁路的气隙增加。 在环形或环形设计中,极片,永磁体和轭都是环形的并且限定环形气隙,磁体可以是圆锥形,具有从气隙增加的厚度。 极片和磁轭在与永磁体相遇的部分处相应地渐缩。 使用非平坦磁体允许更多的磁性材料被包括在换能器中而不增加换能器的总体积。 这导致气隙中增加的磁通密度,从而增加功率和/或效率。