Method for controlling motor in elevator system

A method for controlling a motor in an elevator system,

• wherein in the elevator system, a level sensor is disposed at a fixed position on each floor of a building, and a first magnetic signal emitter and a second magnetic signal emitter are coupled to a car and are vertically arranged to be spaced from each other above the car, and the motor operates to move the car upward or downward,
• wherein the method comprises:
• outputting, to the motor, an output voltage corresponding to a command frequency at a deceleration level when the level sensor receives a magnetic signal from the first magnetic signal emitter;
• measuring a first time duration from a first time-point at which the level sensor receives the magnetic signal of the first magnetic signal emitter to a second time-point at which the level sensor receives a magnetic signal from the second magnetic signal emitter;
• calculating an actual speed of the motor using the first time duration;
• determining a second time duration from the second time-point to a third time-point at which the car stops, using the actual speed and a predetermined travel distance;
• and
• adjusting an leveling error using the second time duration.