wunder betaEL How Elevators Work
Follow cars, counterweights, drives, leveling, doors, governors, and safety layers through a complete elevator trip.
What you’ll learn
- The hoistway and the moving carDescribe the main force paths and distinguish traction from hydraulic elevators.A car moves in guided space while ropes and counterweights or hydraulic pressure provide the lifting force.
- Motor, motion, and levelingConnect drive commands, feedback, braking, and leveling into one control loop.The controller uses measured position and speed to turn a request into a smooth, precise stop.
- Doors and permission to moveExplain how doors, interlocks, sensors, and scheduling connect riders to safe movement.Buttons request service, but the controller grants movement only when the doorway and car state satisfy the required conditions.
- Layers of safetyIdentify the independent stopping and inspection layers around normal elevator control.Brakes, governors, safety gear, buffers, and inspection rules make safety a layered system rather than a single component.
- A complete elevator tripSynthesize mechanics, controls, accessibility, and energy into a complete elevator system.An elevator turns a human request into a controlled, leveled, accessible trip through balance, feedback, permission, and protection.
Questions this course answers
What does the counterweight mainly do in a traction elevator?
The counterweight offsets much of the car mass, so the motor does not lift the entire car from scratch on every trip.
Put these parts of a normal elevator trip in order.
The car must be requested, moved, slowed, precisely aligned, and held before the doors can safely release.
Match each elevator part to its main job.
These parts cooperate but do different jobs: barrier, travel permission, obstruction response, and final alignment.
What is the governor's distinctive role?
The governor is an independent speed-sensing layer that can interrupt normal control and trigger the car safety device.
Explain why an elevator needs both motion control and door interlocks.
A motor can move a car without proving that a shaft opening is protected, so the system separates movement commands from door permission.
Grounded in trusted sources
- U.S. Occupational Safety and Health Administration, 1917.116 Elevators and escalators: https://www.osha.gov/laws-regs/regulations/standardnumber/1917/1917.116
- U.S. Access Board, Chapter 4: Elevators and Platform Lifts: https://www.access-board.gov/ada/guides/chapter-4-elevators-and-platform-lifts/
- California Department of Industrial Relations, Title 8 Section 3036 Governors: https://www.dir.ca.gov/title8/3036.html
- U.S. Department of Energy, Energy Savings Potential and Opportunities for Commercial Building Appliances: https://www.energy.gov/documents/doe-bto-comml-appl-report-full-reportpdf-0
- Wikimedia Commons MediaWiki API image records: https://commons.wikimedia.org/w/api.php
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