Balance factor of traction elevator.

Balance coefficient is an important performance index of traction-driven elevator. The car and counterweight of traction elevator are suspended on both sides of the traction wheel by wire ropes. The counterweight can partially balance the weight of the car and the load inside the car, so that the load of traction motor operation can be reduced. The ideal operating condition is that the weight of counterweight is exactly equal to the weight of the car plus the weight of the load inside the car. In this way, the traction motor operates with minimum load. Since the size of the load in the car is often changed, and each operation is a certain value between no load and full load, and the counterweight is fixed after the installation and commissioning of the elevator, so it is not easy to change at any time, so the above ideal balanced operation state is not always achieved in each operation. However, we can adjust the counterweight to a proper weight (that is, choose a suitable balance factor) to make the elevator run many times basically close to the ideal balance state. The balance coefficient of elevator is defined as follows: B= (T-P) /Q: B – balance coefficient of elevator; T – weight of counterweight; P – car self-weight; Q – rated load of elevator. The national standard GB/T10058-1997 “Elevator Technical Conditions” 3.3.8 stipulates that the balance coefficient of all kinds of elevators should be in the range of 0.4~0.5.