User:Mock wurzel soup/three-phase

Locomotive
Type and origin Power type Steam
Specifications Gauge 1,435 mm (4 ft 8+1⁄2 in) Fuel type Coal

Speed table

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

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