Method and system for detecting balance coefficient of elevator on basis of frequency converter

The invention relates to a method and a system for detecting a balance coefficient of an elevator on the basis of a frequency converter. The method includes the following steps of acquiring an output torque value of a tractor when suspension points of an elevator car and a counter weight are horizontally aligned to each other in static state, and calculating the balance coefficient of the elevator by the aid of the output torque value. The detection of balance coefficient can be completed by just controlling the elevator to run in a state in which the elevator car is horizontally aligned to the counter weight, and the detection is simple in operation process, short in operation time, high in efficiency, and extremely high in precision since the detection is completed under the static state of the elevator.