Elevator Overspeed Governor

Product Description

An Elevator Overspeed Governor is a critical safety device installed in elevator systems to prevent the elevator car from moving at an unsafe speed, especially during a free fall or uncontrolled downward movement.

The governor continuously monitors the speed of the elevator car through a governor rope connected to the elevator safety gear. Under normal operation, the governor rotates freely. If the elevator exceeds its preset safe speed (usually due to a failure in the traction system, control system, or suspension components), the governor activates and performs the following actions:

1. Detects overspeed condition The governor mechanism senses that the elevator is moving faster than the allowed limit.
2. Trips the safety mechanism A centrifugal or electronic sensing system locks the governor.
3. Stops the governor rope movement The locked governor pulls the safety gear linkage.
4. Activates safety brakes The elevator car safety gear grips the guide rails and slows or stops the car safely.
5. Cuts power (in many systems) An electrical switch may disconnect power to the elevator drive system.

Main Components:

• Governor pulley/sheave Rotates with elevator movement.
• Governor rope Connects the governor to the elevator safety gear.
• Flyweights or sensors Detect excessive speed.
• Trip mechanism Locks the governor during overspeed.
• Safety switch Sends a signal to stop elevator operation.
• Safety gear linkage Transfers the action to the car brakes.

Types of Overspeed Governors:

• Mechanical centrifugal governor Uses rotating weights to detect overspeed.
• Electronic overspeed governor Uses sensors and control electronics for monitoring and activation.