Did You Know...
...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8072179 | Electronic starter device for an electric motor, in particular for a compressor of a refrigerating circuit of an electric household appliance An electronic starter device for an electric motor including a first terminal connected in use to a mains voltage source selectively activatable by means of control means to feed respective starter and run windings of the electric motor; switch means arranged in ser... | 12/06/2011 |
| 7369757 | Systems and methods for regulating power in a medical device A system for controlling a motor for use in a ventilation system may include a motor, a voltage adjustment system, a user interface, and a motor controller. The voltage adjustment system may be configured to adjust a voltage applied to the motor. The user interface ... | 05/06/2008 |
| 7336766 | X-ray system and its driving method An X-ray apparatus includes a rotary anode X-ray tube, a stator coil, and a drive-power-supply device. The rotary anode X-ray tube has an anode target arranged in a vacuum envelope, a rotary body coupled to the anode target and configured to rotate together with the... | 02/26/2008 |
| 7327118 | Electric machine and method of operating the electric machine A method of and apparatus for controlling an electric machine. The method can include using a controller to detect whether power is present at a first node of the controller, detect whether power is present at a second node of the controller, generate at least one s... | 02/05/2008 |
| 7245105 | Single-phase induction motor and method for reducing noise in the same A single-phase induction motor and a method for reducing noise in the same, which can eliminate unbalance between magnetomotive forces of main and auxiliary windings in a stator of the motor, thereby implementing a low noise, low vibration motor, and can also achiev... | 07/17/2007 |
| 7239109 | Single-phase induction motor A single-phase induction motor includes a main winding, an auxiliary winding, a run capacitor, and a subsidiary start device. The auxiliary winding is configured such that the number of turns of the auxiliary winding, through which a current flows, varies according ... | 07/03/2007 |
| 7227337 | Battery charger with dual use microprocessor A battery charger with a discrete switched regulator provides relatively high efficiency and relatively low cost. Unlike known battery chargers which incorporate switched regulator ICs, the battery charger in accordance with the present invention utilizes the microp... | 06/05/2007 |
| 7227288 | Apparatus and method for increasing efficiency of electric motors A single or multiphase alternating current electric motor or synchronous generator includes main windings and additional windings that perform de-saturation of the magnetic field of the main windings. Each additional winding is fed through at least one capacitor in ... | 06/05/2007 |
| 7218075 | Electronic circuit for starting a single phase induction motor An electronic circuit for starting a single phase induction motor, of the type containing a rotor and a stator with at least one running coil (B1) and one starting coil (B2), for operating jointly with an alternating current source (F), comprising: a t... | 05/15/2007 |
| 7196490 | Variable speed motor A variable speed motor includes first and second main windings wound on a stator, and a relay for performing a switching operation between serial/parallel connections of the first and second main windings to control motor speed. The variable speed motor further incl... | 03/27/2007 |
| 7180534 | Scanning assemblies, printing devices, and related methods Scanning assemblies, printing devices, and related methods are described. In one embodiment, pole pieces are configured to be coupled with an input voltage source that can produce phase-shifted input voltages, the pole pieces defining at least first and second phase... | 02/20/2007 |
| 7091691 | Variable speed motor An outer-rotor variable-speed motor, to which single-phase AC power is applied and on which a rotor is provided outside a stator, comprises first and second main windings provided on a stator of the motor to form a plurality of poles, a frequency detector for detect... | 08/15/2006 |
| 7081728 | Apparatus for controlling heat generation and recovery in an induction motor An induction motor system comprising an induction motor, equipped with a heat recovery and water pumping apparatus and an apparatus for controlling the electrical efficiency and resulting heat generation of the induction motor. The motor is adapted to be coupled to ... | 07/25/2006 |
| 7078826 | Hybrid gas turbine engine starter-generator A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a conventionally wound main stator that is selectively configurable as a multi-pole AC stator and a mul... | 07/18/2006 |
| 7071650 | Synchronous induction motor and electric hermetic compressor using the same A synchronous induction motor has a stator having a main winding and an auxiliary winding; a rotor having a yoke, a permanent magnet embedded in the yoke and a secondary conductor provided in the vicinity of periphery of the yoke; and a starter. The starter has a st... | 07/04/2006 |
| 7045979 | Multiple-speed electric machine and method of operating the same An electric machine assembly having an electric machine. The electric machine can include a first speed circuit and a second speed circuit. In some constructions, both speed circuits can be of a permanent split capacitor design. At least one of the speed circuits ca... | 05/16/2006 |
| 7042192 | Switch assembly, electric machine having the switch assembly, and method of controlling the same A compressor having a winding circuit and a driven member being driven in part by a winding of the winding circuit. The compressor further includes an auxiliary circuit connected in a parallel relationship with the winding circuit. The auxiliary circuit has an auxil... | 05/09/2006 |
| 7034426 | Electric motor windings This invention relates to an alternating current electric motor, single phase or multiphase or synchronous generator, with primary windings (main windings) and de-saturation additional windings. Each additional winding is fed through one or more multiple capacitors ... | 04/25/2006 |
| 7034500 | Electric drive assembly An electric drive includes a rotatable shaft, a first drive member, and a second drive member, and is supplied with power from a controller. The controller is operable to supply a first power from a power electronics converter, and a second power that is line power.... | 04/25/2006 |
| 7023167 | Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit a starting capacitor and a resistive element Apparatus for driving a three-phase compressor assembly from a single-phase electrical power supply having first and second power lines, said three-phase compressor assembly comprising a compressor having a rotatable shaft, an electrical motor having a rotatable sha... | 04/04/2006 |
| 6979979 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 12/27/2005 |
| 6930464 | Driving circuit for improving starting of hybrid induction motor and method thereof A driving circuit for improving starting of a hybrid induction motor and its method includes a capacitor for operation electrically connected between a main coil and a auxiliary-coil, and a starting and current cutting-off means electrically connected with the capac... | 08/16/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 6819075 | Voltage-controlled starting relay for induction motor There is provided a voltage-controlled electronic relay for starting a single-phase induction motor, which includes: a power supply unit 310, configured of a bridge diode BD, for supplying power to circuit elements of the starting relay when AC power of the i... | 11/16/2004 |
| 6794843 | Ventilator having a muting device A ventilator having a muting device includes a central processing unit, and a fan motor. The fan motor is connected to a start capacitor which is electrically connected to a temperature sensing circuit which is electrically connected to the central processing unit, ... | 09/21/2004 |
| 6653806 | Dynamic brake circuit and semiconductor inverter using dynamic brake circuit The invention prevents the voltage change dv/dt occurring at an inverter from directly igniting a semiconductor braking switch and short-circuiting the inverter during operation. In a dynamic brake circuit which absorbs energy by brake resistor 15 upon ig... | 11/25/2003 |
| 6472844 | Single-phased powered drive system A drive system including a rectifier, a high-frequency filter, a static inverter and an induction motor is driven without energy stores and fed by the single-phase mains, in which the use of an envelope generator with a mains-synchronous, preferably sinus... | 10/29/2002 |
| 6433505 | Phase shifting network A phase shifting network for an inductor motor is provided. The network includes a resistor connected in series with each motor phase coil of a pair of motor phases. The network further includes a capacitor connected between the motor phases. The inventiv... | 08/13/2002 |
| 6356041 | Master three-phase induction motor with satellite three-phase motors driven by a single-phase supply A motor system utilizes a master three-phase induction motor driven by a single-phase power supply which the motor has six-windings connected in a symmetrical double DELTA or double WYE configuration with appropriate running capacitors to provide when the... | 03/12/2002 |
| 6346790 | Induction motor system with an induction motor and an electrically isolated voltage modulation motor controller An induction motor system operable in a wet environment comprises an induction motor and an apparatus for controlling the speed of the motor. The motor is adapted to be coupled to an AC source for supplying an AC signal. The motor includes a rotor having ... | 02/12/2002 |
| 6329783 | Apparatus for continuously variable speed electric motor applications An electric motor and its controller are specially adapted for variable speed applications. The stator of the motor has its main windings controlled by triacs. The triacs are placed to allow the main windings to operate in series at low speed and in paral... | 12/11/2001 |
| 6320348 | Time rate of change motor start circuit A start circuit for a single-phase AC motor controls the current through the start or auxiliary winding based on time rate of change of voltage or current, or based on the current or voltage dropping or rising some fraction from inrush value, i.e., to 50%... | 11/20/2001 |
| 6249104 | Cutout start switch heating A motor start switch includes a temperature responsive resistor element and a cutout switch electrically connected in series with a start winding of an electric motor. The cutout switch is in thermal contact with the temperature responsive resistor elemen... | 06/19/2001 |
| 6051953 | Brushless exciterless field system for AC synchronous machines A three phase AC motor which rotates at the synchronous speed determined by the number of poles of its main stator winding and the frequency of the AC input to it, which does not need any exciter machine or brushes to provide its DC field current, but has... | 04/18/2000 |
| 6049188 | Single-phase motor starters For a three-winding motor, a starting capacitor bank provides balanced currents in the windings, a high starting torque, and unity power-factor current in the single-phase supply line. A run-capacitor bank provides full-load balanced currents and a leadin... | 04/11/2000 |
| 6037729 | Apparatus and method for braking electric motors A braking circuit for braking an electric motor having an armature and run and brake windings, which includes a switching circuit disposed between a source of electrical power and the run winding, this circuit being operable to disconnect the run winding ... | 03/14/2000 |
| 6025693 | Motor starter An improved method of starting three-phase and three-winding induction motors from a single phase supply reconfigures the 6 accessible windings of a standard induction motor into first an optimal starting configuration which, for example, may reduce start... | 02/15/2000 |
| 5990653 | Method for controlling the speed of a single-phase asynchronous induction motor Method for controlling the speed of a single-phase asynchronous induction motor, the stator of which is equipped with a main winding (BP) and an auxiliary winding which consist of half-windings (B1, B2) which are magnetically coupled and wound in opposite... | 11/23/1999 |
| 5982122 | Capacitively powered motor and constant speed control therefor A capacitively powered motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating assembly to rotate. A position sensing... | 11/09/1999 |
| 5973472 | Single-phase asynchronous motor with two windings A motor whose stator is equipped with a main winding (DP) and with an auxiliary winding which consists of two half-windings (B1, B2) that are wound in opposite directions and is supplied through a full-wave rectifier (GR) and by means of two commutating s... | 10/26/1999 |
