User:Mock wurzel soup/three-phase

{{Infobox locomotive

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| image =

| caption =

| powertype = Steam

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| gauge = {{track gauge|1435 mm}}

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| locoweight =

| tenderweight =

| fueltype = Coal

| fuelcap =

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Speed table

Speed in rpm of synchronous motors at various frequencies

Poles/Frequency	15 Hz	16.7 Hz	25 Hz	45 Hz	50 Hz
class="wikitable"
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

class="wikitable"

! 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