Improvements in or relating to rotary electric machines,申请号GB19620028381-传众专利搜索

Improvements in or relating to rotary electric machines

申请公布号：GB988726(A)

申请号：GB19620028381

申请日期：1962.07.24

申请公布日期：1965.04.07

申请人：

NATIONAL RESEARCH DEVELOPMENT CORPORATION

发明人：RAWCLIFFE GORDON HINDLE;FONG WILLIAM

分类号：B23K15/00;H01J37/18;H01J37/21;H01J37/30;H01J37/301;H02K3/28

主分类号：B23K15/00

摘要：988,726. Winding lay-outs for dynamo-electric machines. NATIONAL RESEARCH DEVELOPMENT CORPORATION. July 19, 1963 [July 24, 1962], No. 28381/62. Heading H2A. In a system of pole-changing by poleamplitude modulation effected by applying a single pole-amplitude modulation wave to the three-phase winding as a whole, and in which neither the unmodulated pole-number nor number of cycles of the modulation wave (which has an odd number of cycles) is three or a multiple thereof, the unwanted resultant pole number is either eliminated by chording or ignored, and the winding is arranged to have three slots per pole per phase (or a multiple thereof) and reversing substantially one half of the coils of each phase in such a way as to provide a single wave extending over the winding as a whole whilst preserving the balance of each phase about a neutral line for the phase. The 4-pole, 36-slot winding shown in Fig. 1 is modulated by a single cycle X-X to produce 6-pole operation. The conductors under the line X-X are reversed on modulation. Simply reversing half of the winding, e.g. slots 19-36, provides the desired modulated pole-number of six, but leaves the winding unbalanced. Fig. 2 shows the vector positions of phase A slots with respect to the 6-pole operation for which the slots are spaced by 30 degrees. Reversal about the neutral line by reversing slots 19-36 is shown by ringing the slots reversed. Fig. 3 shows the vector-positions of the phase " C " slots, and shows that simply reversing half the winding does not reverse the correct vectorially placed slots. Thus, coil 33 is not reversed, but coil 15 is to produce a phase-winding which is balanced about its own neutral axis. Similar considerations apply to the remaining phase. A series-parallel winding arrangement to produce the desired effect is shown in Fig. 5 (not shown). The invention is described with reference to other pole numbers. Specifications 900,600, 926,101 and 968,988 are referred to.