Although O and P Stock units could be coupled together, the metadyne units in particular were not the same, and could not be interchanged between the builds.
12.
In order to improve its response, he supplied the field windings with a constant current, and used a partially compensated Metadyne to control the armature current of each motor.
13.
The metadyne system is more efficient than conventional starting resistances, particularly when the locomotive starts and stops frequently, or when it needs to run for long periods at slow speeds.
14.
As with the metadyne generator, the Metadyne transformer can be partially compensated, and will continue to operate as a constant-current device until the compensation exceeds 97 per cent.
15.
As with the metadyne generator, the Metadyne transformer can be partially compensated, and will continue to operate as a constant-current device until the compensation exceeds 97 per cent.
16.
Acceleration was smoother than on a train which switched starting resistances, and when braking the metadyne unit returned power to the tracks, which could be used by other trains if needed.
17.
Pestarini filed a patent on the metadyne machine in France on 14 January 1932, and submitted it to the United States Patent Office at the end of the year, on 23 December.
18.
Despite the shortcomings which led to its demise, the metadyne system as introduced in 1936 on the O Stock trains was the first in the world to provide regenerative braking on an electric multiple unit.
19.
Tustin compared Ward Leonard control systems, Metadynes and Amplidynes, and accepted that each had its merits, but favoured the Metadyne, of which he had several years experience from their use in traction control.
20.
In the late 1920s / 1930s 1500V DC began to be used on the PO rail system; the locomotives were converted for 1500V operation at workshops at Vitry-sur-Seine using a Metadyne for traction control.
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