| 摘要 |
<p>1,214,213. Generators with permanent magnets. ATOMIC ENERGY OF CANADA Ltd. 25 June, 1968 [18 Sept., 1967], No. 30334/68. Heading H2A. An electric generator has an arrangement of magnetic shunts which pass the flux of an annular permanent magnet alternately through a path which links the coil and through a shortcircuit path which does not link the coil. In the construction shown, rotor R includes a plurality of annular magnet discs 11, of ferrite material, stacked together on shaft 10 with similar polarities adjacent. The discs are spaced by soft iron spacers 12 having outwardly projecting polepieces 13. The stator S comprises a tubular member of insulating material 26 having circumferential slots containing windings 20- 25. Secured to the inside surface of tube 26 are a plurality of elongated magnetic shunts 30 -36 which over part of the rotation of the rotor exactly bridge the adjacent motor poles 13 thereby short-circuiting the flux of the respective magnet 12 so that it does not link with a coil. When the flux is not short-circuited it will pass upwardly through tube 26 to cut the respective coil and this change in flux will induce a voltage in the coil. The shunt members are staggered so that a multiphase output is obtained. In an alternative construction the flux switching member is rotated between two stationary structures. The inner stator comprises annular magnet laminations separated by spacers which are extended radially to form teeth. The outer stator comprises a series of annular coils having magnetic shunt members around them which face the teeth on the inner stator. The rotating switch member consists of a tube of insulating material with segments of magnetic material spaced apart by the distance between the teeth and additional interposed slanting members which project only between the teeth of the inner stator, Figs. 6-10 (not shown).</p> |
