Patent ID: 7506726

Claim:
A safety device for an elevator comprising a cabin, a counterweight, a cabin drive motor, said motor having a rotor, and at least one power-failure electromechanical brake, the safety device comprising a control device arranged: to receive at least one information allowing emergency power to be applied to the brake in order to release the rotor and allow the cabin blocked between two floors to move under an effect of unbalance between the weight of the cabin and the weight of the counterweight; to receive at least one information enabling a speed of the cabin to be known; and to manage power supply to the brake in such a manner as to enable the cabin to move to an evacuation floor under the effect of being out of balance with the counterweight, while preventing the speed of the cabin from exceeding a predefined limit, wherein the information enabling the speed of the cabin to be known is provided by at least one electrical magnitude from the motor.