Чертеж

The use of a gearbox permits the constant power band to be increased significantly.

Power-speed graph

Legend:
n_rated      Rated speed
n_rated'      Rated speed with two-stage gearbox
n_max       Max. permissible speed
P_rated      Rated power and constant power of the motor in the speed range between n_rated and n_max or n_rated' and n_max

M            Torque