What is the function of a "buffer" in an elevator system?

The function of a "buffer" in an elevator system is primarily to absorb kinetic energy and reduce impact during landing. Buffers are typically installed at the bottom of the elevator shaft and play a critical safety role by cushioning the elevator car as it reaches the end of its travel. When an elevator descends, the buffers compress and help to dissipate the energy created by the car's weight and speed, preventing damage to both the elevator and its occupants in the event of a malfunction or overshoot. This impact-absorbing feature is essential for ensuring a safe and smooth experience for passengers and enhancing the overall reliability of the elevator system.

The other functions mentioned, such as storing electrical energy for emergency use, controlling speed, and assisting in powering the elevator, are handled by other components within the system, such as batteries, motors, and variable frequency drives, rather than by the buffer itself.