| 摘要 |
<p>1,105,767. Dynamo-electric machines. J. JARRET, and J. JARRET. 19 May, 1966 [19 May, 1965], No. 22315/66. Heading H2A. In a variable-reluctance motor having the structure of that described in Specification 1,099,010, the stator has four times the number of poles (such as 201 . . . 204) as the rotor (121), each of the stator poles carrying windings the current in which is switched by mechanical or electronic switches (3) synchronized to a submultiple of the rotor speed. As described, the stator is energized by a common axial winding 21, the flux in each pole being periodically increased and decreased by current switched into opposed windings on each pole under control of cams 300, 305 rotating at one-eighth of the rotor speed and co-operating with contacts 301 . . . 304. The stator poles are divided into eight groups of four poles, the windings on alternate poles of each group being connected in series, whilst corresponding windings of all groups are connected in parallel. The rotor teeth 121 are formed by pure iron strips separated from one another by insulation so that the proportion of pure iron in the teeth is between 0À5 and 0À85. The teeth are shaped so that the net flux in the rotor during operation is constant, a trapezoidal voltage (Fig. 4, not shown) being induced in the stator windings.</p> |
