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User:Mock wurzel soup/three-phase

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Locomotive
Type and origin
Power typeSteam
Specifications
Gauge1,435 mm (4 ft 8+12 in)
Fuel typeCoal

Speed table

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Speed in rpm of synchronous motors at various frequencies

Poles/Frequency 15 Hz 16.7 Hz 25 Hz 45 Hz 50 Hz
2 900 1,000 1,500 2,700 3,000
4 450 500 750 1,350 1,500
6 300 333 500 900 1,000
8 225 250 375 675 750
10 180 200 300 540 600
12 150 167 250 450 500
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.

List

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Anno di ordinazione Costruttore Quantità Rodiggio (UIC) Gruppo Numerazione d'origine Numerazione finale Anno d'immissione in servizio
1912 Soc. It. Westinghouse 16 1'C1' 030 0301-03016 E.330.001-016 1914
1913 Tecnomasio Italiano Brown Boveri 18 2'C2' 033 0331-03318 E.331.001-018 1916-1920
1913 Costruzioni Meccaniche di Saronno 6 2'C2' 034 0341-0346 E.332.001-006 1917
1912 Soc. It. Westinghouse 45 E 050 05041-05085 E.550.041-085 1913-1914
1913 Soc. It. Westinghouse 25 E 050 05086-050110 E.550.086-110 1914-1915
1913 Costruzioni Meccaniche di Saronno 12 E 051 0511-05112 (E.551.1-12) Non costruite