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To vary the speed, it is necessary to vary NS and thus the frequency of the voltage supplied to
the motor.
The torque characteristics will be translated on the speed axis. The supply voltage will vary from
O to 4000 r.p.m. in order to keep the U/f ratio constant and not saturate the magnetic circuit.
Couple
Torque
Service Manual 11290099
Couple
résistant
Vitesse
Speed
page 14 of 44
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