Otis Elevator Company

Marcel Pavoz

Ernest P Gagnon

Rene Ficheux

A multiple linear motor arrangement is provided having a secondary, a first primary, a plurality of second primaries, and a frame, in which the body of the first primary of the motor arrangement on one side of the secondary is offset from the bodies of the second primaries on the other side of the secondary. Magnetic flux emanating from the first and second primaries, therefore, does not appreciably overlap.

Elevator with linear motor drive assembly

The elevator has a linear motor-counterweight assembly which provides the driving power for moving the elevator car. The linear motor is a flat linear motor which runs on a flat strip of steel which is partially coated with a layer of aluminum, copper or the like conductor. The side margins of the steel strip are not coated with the conductor metal, and serve as bearing surfaces for the guide rollers on the counterweight. The counterweight has modular brakes mounted on it which engage the margins of the steel strip to control movement of the counterweight and elevator car. The brakes are electromechanical brakes which are silenced for use in the elevator environment. The counterweight may also have safety gears mounted thereon which also act upon the margins of the steel strip for emergency braking of the counterweight.

Elevator with linear motor counterweight assembly

Movement of the elevator is derived from a linear motor forming a part of the counterweight assembly of the elevator. Overhead guide sheaves carry the ropes which connect the counterweight with the cab. The guide sheaves are mounted laterally of the cab on both sides thereof whereby there are no sheaves directly above and in line with the cab. The cab mount beam connects to the center of gravity of the cab but lies skew to the lateral vertical plane of symmetry of the cab so that the ropes will be offset fore and aft of the guide rails of the cab.

Sheave array of a self propelled elevator using a linear motor on the

An elevator system using a linear induction motor for propulsion. The linear induction motor is mounted in the elevator counterweight along with a battery, motor control equipment, and battery charger. The counterweight is guided by a tubular rail which acts as the motor armature.

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Nanterre, France

Marcel Pavoz