What should be the ratio of the counterweight to the car weight?

The correct ratio of the counterweight to the car weight in an elevator system is typically around 40% of the car weight. This ratio is essential for maintaining balance and ensuring the efficient operation of the elevator. A counterweight set at this ratio helps reduce the load on the motor, as it offsets a portion of the car's weight, thereby lowering energy consumption and wear on the elevator machinery.

Having the counterweight at 40% of the car's weight strikes a balance that allows for smooth starting and stopping of the elevator. It avoids excessive strain on the hoisting system and ensures the system operates safely and reliably. This consideration is crucial, especially in designs where the elevator makes frequent trips or has variable loads.