User:Mock wurzel soup/three-phase

Speed table
Speed in rpm of synchronous motors at various frequencies


 * Examples at 16.7 Hz with 1.63 metre driving wheels
 * 6 poles, 333 x 60 x 1.63 x 3.142 / 1,000 = 102 km/hr (51 km/hr with cascade)
 * 8 poles, 250 x 60 x 1.63 x 3.142 / 1,000 = 77 km/hr (38 km/hr with cascade)

Summary: 38, 51, 77, 102 km/hr. This is quite close to the figures quoted for FS Class E.431: 37.5, 50, 75, 100 km/hr. Actual speed would be slightly lower because asynchronous motors were used.