Inventio Ag

Thomas Eilinger

Romeo Deplazes

Herbert Stemmler

Urs Ammon

André Peter

Urs Polin

Enrique Almada

Erich Spirgi

Jörg Evertz

Om Prakash

Danilo Peric

Daniel Bossard

Roman Camenzind

Andre Peter

Raphael Ulrich

A drive control method and system for controlling an inverter during power disruptions in the operation of an elevator drive includes the steps of predetermining whether a hoist motor of the elevator drive will be operating in a motor mode, a balanced mode or a regenerative mode on commencement of the power disruption, and controlling the inverter in accordance with the predetermined operating mode after commencement of the power disruption.

Elevator drive control during power disruption

A method for operating an elevator having a car driven by a motor and at least one brake to stop the car, the method including closing a brake, increasing a torque of the motor until the car moves, and registering a value indicative of the motor torque at which the car moves.

Method for operating elevators to test brakes

An elevator, particularly for transporting passengers, has an elevator car guided in an elevator shaft a direct drive motor. The drive motor includes an active primary part at the elevator car and a passive secondary part that is fixed in the elevator shaft and is spaced from the primary part by an air gap. In order to achieve a high power capability, the drive motor is configured as a transverse flux motor that moves the primary part linearly relative to the secondary part under the influence of an electromagnetic propulsive force. The secondary part has at least one rail made of a soft magnetic material and subdivided into a plurality of segments having a predetermined length. The segments are fixed to a wall of the elevator shaft by intermediate elements.

Elevator with transverse flux drive

Emergency current supply equipment for lift installations with electric motor drives has the task of bridging over temporary drops or interruptions in main voltage and of supplying, in the event of failure of the mains supply during a lift travel, all components of the lift installation needed for an evacuation travel with energy until such time as the lift car has reached the level of a story. The energy storage unit used for that purpose comprises as the storage medium exclusively capacitors in the form of super capacitors or a combination of super capacitors and electrochemically acting batteries.

Emergency power supply device for lift systems

Elevator installations with electric drive systems are equipped with devices ( ) to reduce the power supply connection rating which have energy storage units ( ) which are formed entirely or partly from so-called supercapacitors ( ). The device ( ) according to the invention has the effect on the one hand that power peaks during starting and braking operations are compensated by the exchange of energy between the storage unit ( ) and motor supply, and on the other hand that the power consumption occurring during a trip is also spread over a part of the at-rest time. Supercapacitors ( ) as energy stores tolerate by comparison with electrochemically acting accumulators a much higher number of charging and discharging cycles at high values of current.

Super-capacitor energy storage unit for elevator installations

A method and apparatus for the low noise operation of a electrical machine driven by a pulse inverter computes the amplitudes and frequencies of the harmonics of the inverter output voltages. Through targeted setting of the modulation parameters, the frequency spectrum or the noise spectrum can be fanned out and harmonics, which would excite stator resonances, can be eliminated. Due to the independence of the modulation parameters from the modulation index (a.sub.0) and the fundamental oscillation frequency (f.sub.1), the fanning-out and the elimination has no influence on the fundamental oscillation (u.sub.GS) or on the operating point of the machine. The inverter is controlled through sinusoidal pulse width modulation (PWM) and sinusoidal pulse frequency modulation (PFM) of a triangular carrier signal (U.sub.H). By this method, the main groups of the harmonics with two ordinate numbers (n, v) are fanned out into subgroups with three ordinate numbers (n, m, v). In addition to a more uniform distribution, there also is a reduction in the amplitudes of the harmonics (U.sub.nmv) through this fanning-out method. The generated noise is reduced in level and the sound pattern does not contain any conspicuous unpleasant individual frequencies.

Growing community of inventors

Küssnacht am Rigi, Switzerland

Thomas Eilinger