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| Number | Title | Issue Date |
| 7274865 | General purpose 100% solid state drive for direct current rotary machines General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as mo... | 09/25/2007 |
| 7246686 | Power supply for elevator systems having variable speed drives An improved system of variable speed drives that enhances the energy efficiency of an elevator system by enabling power transfer between the variable speed drives of two or more elevators via a common DC bus. Any combination of regenerative and non-regenerative vari... | 07/24/2007 |
| 7228942 | Method for energy storage for DC motor powered load hoisting machinery A method for energy storage and recovery for load hoisting equipment driven by a diode controlled DC motor and having an inverter controlling an induction motor which drives a flywheel whereby, utilizing rest power such as reverse power from the DC motor when loweri... | 06/12/2007 |
| 7230399 | Vehicular generator-motor system A vehicular generator-motor 1 is composed of a rotor, a stator having three phase armature winding 2, and a converter 4. The rotor is provided with a field winding 3 for magnetizing a plurality of magnetic pole pieces 14a... | 06/12/2007 |
| 7071645 | Braking device for an electric motor, electrical apparatus provided with the braking device, and a method of braking A braking device for an electric motor of a power tool has a short circuit switch for short circuiting an armature winding of the electric motor during a braking process, the short circuit switch for controlling its switch condition having a control input, a control... | 07/04/2006 |
| 7064509 | Apparatus for DC motor position detection with capacitive ripple current extraction An apparatus for determining angular positions of DC motor includes a capacitor connected in parallel with the DC motor. The current flowing through the capacitor, at any given time, is an AC ripple current responsive to a commutation event of the DC motor. The capa... | 06/20/2006 |
| 7014014 | Safety device for monitoring a movable element A safety device for monitoring a movable element, in particular, for elevators, is provided. The safety device includes a speed determination unit for determining the speed of the movable element, a comparator device for comparing a predetermined speed with the dete... | 03/21/2006 |
| 5969303 | Emergency stop circuit for a direct current elevator drive An emergency stop circuit for an elevator drive includes an emergency stop control (7) that selectively varies the current flowing in a field winding (4) of a direct current drive motor (M). During an emergency stop, the motor (M) operates as a generator ... | 10/19/1999 |
| 5909017 | Elevator energy conservation system An elevator energy conservation system is disclosed comprising an elevator motor driven by generator having two power supplies. A primary power supply provides electricity to the generator when the elevator motor is in use, while a smaller power supply us... | 06/01/1999 |
| 5900597 | Elevator controller/solid state drive interface An elevator controller/solid state drive interface allows an existing relay logic passenger elevator controller to be retrofitted with either a DC or AC solid state drive replacing the motor generator set for DC hoist motors or the two-speed starter in AC... | 05/04/1999 |
| 5070967 | System for monitoring the operation of a cage moving in a mine shaft A pulse encoder digitally derives a first value of speed at which the cage is moving at any given time. An analog device, such as a tachogenerator, derives the second value of the speed, in analog form, at which the cage is moving at the same time. The tw... | 12/10/1991 |
| 4684856 | Method and drive for elevator DC drive motor stabilization A method and device for elevator DC drive motor speed control stabilization system in which current data and speed data are used as feed-back information. The current regulator is approximated by an ideal integrator, and mathematical model thereby obtaine... | 08/04/1987 |
| 4671390 | Converter-powered drive for an elevator A twelve-pulse converter has an a.c.-input and a d.c.-output which is connected with an armature via two thyristors of a change-over circuit. An extinguishing circuit comprises a resistor, a capacitor, an inductor and a thyristor which is also connected w... | 06/09/1987 |
| 4672277 | Elevator motor control 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 ac... | 06/09/1987 |
| 4616733 | Method and apparatus for reducing gear backlash impacts in an elevator system Collision impacts between meshing gears in a speed reduction mechanism 11 of an elevator system due to backlash during transitions between power/driving and regenerative/driven modes of operation are reduced by detecting the actual or approaching separati... | 10/14/1986 |
| 4582174 | Elevator system A traction elevator system having an elevator car driven by a dual converter bank, solid state motor drive. The solid state motor drive includes bank selection circuits, which select the operative converter bank at any instant, and firing circuits for pro... | 04/15/1986 |
| 4416352 | Elevator system An elevator system including an elevator car and a drive machine having a DC drive motor, a dual converter, and a phase controller for providing gate drive signals for the dual converter. A reference signal relates to the desired motor armature current is... | 11/22/1983 |
| 4399892 | Thyristor Leonard type elevator control system The disclosed elevator control systems comprises a three-phase AC source and an emergency three-phase AC generator supplying selectively an AC power to a thyristor Leonard type converter connected to a hoist DC motor for driving an elevator car, and a fir... | 08/23/1983 |
| 4373610 | Speed control apparatus for elevator A speed control apparatus for an elevator wherein a current command signal for controlling the firing angle of dual thyristor converters is supplied through a filter circuit. On switching from one converter to the other pursuant to reversing the elevator ... | 02/15/1983 |
| 4307793 | Elevator system An elevator system of the traction type having a direct current drive motor and a solid-state, dual-bridge converter power supply. Protective and monitoring apparatus reduce the probability of fuse blowing due to improper gating of a controlled rectifier ... | 12/29/1981 |
| 4284175 | Emergency stop apparatus for electric elevators An emergency stop apparatus for electric elevators which comprises a DC motor for driving a cage and being controllingly driven by variable DC power source connected to an AC power source, a power stoppage memorizing circuit which detects the power stoppa... | 08/18/1981 |
| 4263988 | Speed control system for a motor A speed control system for an elevator motor, comprising a D. C. motor for driving an elevator, a device which generates a speed command signal for the elevator, a speed dynamo which generates a speed signal corresponding to a speed of the elevator, a spe... | 04/28/1981 |
| 4209082 | Elevator control apparatus An elevator control apparatus comprises a thyristor power rectifier connected to an AC power source and for driving a DC motor for cage drive; a power stoppage detector for detecting the power stoppage of the AC power source; and a series circuit includin... | 06/24/1980 |
| 4165801 | Static Leonard system The disclosed Leonard type elevator system comprises a reversible converter for controllably driving a DC motor, and an AC voltage detector and a DC voltage detector connected to the AC and DC sides of the converter respectively for detecting the voltages... | 08/28/1979 |
| 4086983 | Elevator control system A direct current motor for an elevator car includes an armature and an interpole winding or a series field winding serially connected to the armature and controlled by a static Ward-Leonard device. A filter includes the interpole or series field winding a... | 05/02/1978 |
| 3938624 | Transportation system with motor field control A first solid-state static converter receives a threephase A.C. input and directly supplies direct current to a D.C. motor armature circuit to operate a traction sheave and control the movement of an elevator car in response to an error signal derived by ... | 02/17/1976 |
