There are three kinds of tower crane lifting motors: variable frequency motor, three-speed pole-changing motor, single-speed or double-speed single slip ring or double slip ring eddy current speed regulating winding motor.
There are also three kinds of motors for tower crane trolley: frequency conversion motor, two-speed motor and three-speed motor.
There are also three kinds of tower crane rotating motors: single-speed winding motor, variable frequency motor and torque motor.