| 摘要 |
<p>In a D. C. generator type non-contact speed sensing device comprising a cylindrical rotor (1) with the magnetic N and S poles (N, S) alternating around the periphery and a stator (2) disposed confronting the rotor (1), the magnetic poles (N, S) of the rotor are arranged so as to divide the whole periphery equally and the windings (W1, W2, W3, W4) of the stator are arranged so that the distance between the wound parts in each of the windings (Z1, Z2, Z3, Z4 as shown in the drawing in respect to the winding W1) is different from the distance between the magnetic poles (N, S) of the rotor and, therefore, the relation between the phase of the magnetic pole and that of the wound part is not the same for every wound part. As a result, the phase of the ripple component due to slot ripple in the electromotive force induced in each wound part is different from that in the others, so that the components counterbalance each other in a resultant one-phase output so as to improve the accuracy of speed sensing.</p> |
