CH3
Chapter 3 · Elevators and mine hoists
Tutorials 3.1, 3.2 and 3.3 of the booklet, then practice linked to Lab III and the course's worked examples.
8 exercises
- 01Four-quadrant analysis of an elevator travel cycleCounterweight, mass imbalance and quadrant for a full car going up and an empty car coming down. · 6 questionsTD 3.1Not started
- 02Sizing the braking resistor of a traction elevatorCounterweight, worst-case unbalanced mass, regenerated power, and the resistor window set by the DC bus and the chopper. · 9 questionsTD 3.2Not started
- 03Fault analysis of the safety chainSafe and dangerous failures of a series chain of NC contacts, and fault finding by voltage bracketing. · 5 questionsTD 3.3Not started
- 04Retrofitting a gearless office liftMotoring and generating torque at the sheave for the same imbalance: why efficiency divides one and multiplies the other. · 2 questionsCourse §3.1.2Not started
- 05Static and dynamic torque of a liftThe full car going up: static torque, reflected inertia and the peak torque while accelerating. · 3 questionsLab IIINot started
- 06Trip time of an S-curveThe seven-phase trip: jerk phase, trapezoidal time and what the comfort costs. · 3 questionsLab IIINot started
- 07Encoder resolution and levelingCar travel per encoder edge, the drift of dead reckoning, and the direct-to-floor braking distance. · 3 questionsCourse §3.2.3Not started
- 08Winding cycle of a skip hoistWind time, cycle time and production of a mine hoist from its winding diagram (course eq. 3.9). · 3 questionsCourse §3.4.3Not started