essai de ralentissement

OBS: essai de ralentissement : terme normalisé par la Commission électrotechnique internationale (CEI).

CONT: In the retardation test, the d.c. [direct current] machine is run as a motor at a speed just above the normal. Then the supply to the armature is cut off while the field is normally excited. The speed is allowed to fall to some value just below normal. The time taken for this fall of speed is noted. From these observations, the rotational losses (i.e., friction, windage and iron losses) and hence the efficiency of the machine can be determined.
OBS: retardation test: term standardized by the International Electrotechnical Commission (IEC).