Abstract: A cage position detecting apparatus operates the data for the present position of the cage by a computer. The data for the final floor memorized in a read only memory are used as the data for the present position when the cage stops at the final floor to output a signal from a position detector placed in a hatchway. The cage is run to the final floor when the position detector corresponding to the final floor does not output a signal in the condition that the operated data for the present floor indicates the final floor. The operated data for the present position are memorized in a memory device actuated by the emergency power source to give the data being coincident with the actual cage position even though the operated data for the present position of the cage are changed by service interruption. The data for the condition of the cage just before the service interruption are memorized in the memory device.

Abstract: An elevator control device which selectively employs an operational mode in which the cage of the elevator is run at a maximum rated speed or an operational mode in which the cage is run at a speed lower than the rated speed as determined by distance codes read out from a memory. The cage is accelerated in accordance with an acceleration signal the value of which is determined by the total distance between the start and stop floors. A deceleration instruction signal is produced in accordance with the difference between the acceleration instruction signal and the distance to the floor at which the cage is to be stopped. The acceleration instruction signal is compared with the deceleration instruction signal and a decision is made as to which is utilized as a speed instruction signal to a motor operating the elevator cage in accordance with which is the larger.

Abstract: The disclosed elevator speed control system accelerates an induction motor for an elevator car in accordance with a voltage dependent upon a differential signal between a command speed signal and the actual speed signal and passed through a saturation generator. The saturation generator issues a command for applying across the motor its rated voltage upon the closure of a normally open contact set disposed in it. The system includes a sensor circuit is responsive to the difference signal less than a predetermined magnitude to decrease an output from the saturation generator. Alternatively the sensor circuit may responds to a negative load on the motor exceeding a predetermined magnitude to decrease the output from the saturation generator.