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Crane hoist drive

Raise and lower the Tutorial 4.1 load: torque, quadrant, returned power, and a resistor rated on the duty cycle.

Lesson: Crane motions and the hoist drive
Try it: the crane hoist of Tutorial 4.1

Raising: quadrant I, motoring. The motor supplies m g v plus the losses.

Load power m g v
12.26 kW
Gear ratio (motor at 1450 rpm, drum 0.4 m)
243
Motor torque
95.0 N·m
Motor power T·ω
14.43 kW

The resistor's continuous rating follows the duty cycle, not the peak.

Power returned when lowering
10.42 kW
Braking resistor U_dc²/P
36.9 Ω
Peak power absorbed
10.4 kW
Continuous rating needed
1.56 kW

T = m g R / (i η^±1) ; R = U_dc² / P_gen ; P_cont = P_gen · t_lower / t_cycle