Variable frequency drive system of transmission gear ratios

Transmission ratio of the speed of the input shaft and output shaft, gear ratio:
    (4-10)
Λtransmission ratio;
NM-the speed of the motor, usually of the transmission input shaft speed
( r/min);
NL-loading speed is usually the speed of the output shaft of the transmission mechanism
(r/min)。
By (4-10) know:
(4-11)
Ignore case of power loss in the transmission mechanism, based on the transmission and the principle of conservation of energy, are:
   (4-12)
(4-11) and (4-12), after after the transmission speed, speed ratio of motor to reduce λ times the load side, and load the resulting increase motor torque ratio λ times.