Elevator Gmbh

Kone Oy

Kone Elevator Gbmh

Heimo Makinen

Matti J Kahkipuro

Seppo Suur-Askola

Jouko Perttula

The invention relates to a method and means for determining the position of an elevator car on the principle of floor selection by means of a pulse train, whereby the position of the elevator car is determined on the basis of a pulse count indicating the elevator's speed. The achieve a more reliable pulse count based floor selection system which is suited for use with any type of elevator, the pulses required for calculating the elevator position for floor selection are obtained from an acceleration sensor placed on the elevator car, the output signal of which is integrated so as to obtain a voltage representing the speed of the elevator car, said voltage being converted into a pulse train whose frequency is dependent on the speed of movement of the elevator car.

Method for determining the position of an elevator car and a pulse count

A method and apparatus for controlling a direct current motor of an elevator during emergency braking by conducting a current generated by the motor through a braking resistor are disclosed, in which a semiconductor switch connects the braking resistor across the motor during the emergency braking and a mains voltage to the motor is simultaneously interrupted.

Elevator motor control

The present invention concerns a method for improving the dynamic converter drive for a direct current elevator motor, in which the said motor is controlled by adjusting the magnetization of the generator linked to the lifting motor, such adjustment being achieved by means of a power electronics stage controlled by the elevator speed control system, using at least elevator speed and motor current consumption (or other current information proportional thereto) as feedback parameters. The intended improvement is achieved by measuring the current values at two different points in the magnetizing circuit of the generator by means of current measuring resistors, the result of the measurement at the first point indicating the generator magnetizing current value, which is supplied to the speed control unit of the speed control system, and the current measured at the second point representing the thyristor bridge current value, which is supplied to the circuit responsible for bridge changeover control in the said power electronics stage.

Method for improving the dynamic converter drive for a direct current

Procedure and measuring circuit for stopping an elevator

Speed control system for a motor with short-circuited rotor

A procedure for exactly stopping an elevator at a desired point, which elevator is moving along a controlled path and is provided with stopping brake for controlling the time of start of the braking. Determination of the time for starting the braking is with the aid of direct and indirect measurement of the velocity of the elevator and with the aid of a logic unit (LU). This logic unit (LU) contains at least one central processing unit (CPU), a program memory (PM) and a data memory (DM), so that the central processing unit implements operations in accordance with commands stored in the program memory and reads information from the data memory and stores information in the data memory.

Method and apparatus for stopping an elevator

Procedure for exact aligning with the storey floor level of a lift cage driven by an alternating current motor, wherein the current in one or several phases of the lift's drive motor (2) is choked with a controllable choke element (22). The control is governed by a control unit (23) which receives information of the lift cage's (8) true velocity, constituting a feedback-connected control loop which imparts to the lift cage in fine adjustment running a low velocity from which the lift cage is able to stop at the storey floor level within a required tolerance range.

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Hyvinkaa, Finland

Heimo Makinen