Quotables
"One of the greatest labor saving inventions of today is tomorrow!"
Vincent T. Floss
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 |
| 7346462 | System, method, and article of manufacture for determining parameter values associated with an electrical grid A system, method, and article of manufacture for determining parameter values associated with an electrical grid in accordance with an exemplary embodiment is provided. The electrical grid has a point of interconnection where the electrical grid is electrically coup... | 03/18/2008 |
| 7193380 | Method for rotating a printer paper-feed roller A method for rotating a printer paper-feed roller wherein the roller is driven by a DC (direct current) motor. A feedback-control signal is applied to the motor until the roller reaches a desired rotational position. The feedback-control signal is a function of an e... | 03/20/2007 |
| 7135833 | Motor control for flux-reduced braking A method and apparatus for braking an AC motor in the higher portion of its speed range includes substantially reducing flux before applying reverse torque commands to brake the motor. A DC link bus regulator is employed to prevent increases in bus voltage and frequ... | 11/14/2006 |
| 7095207 | Load and speed sensitive motor starting circuit and method A circuit and method measures the voltage at the main motor winding (1) and detects the points in the electromagnetic wave cycle at which this voltage “crosses” zero. The method and circuit also measures the voltage at the auxiliary motor winding (2 | 08/22/2006 |
| 7016793 | Method and apparatus for anti-islanding protection of distributed generations An apparatus for anti-islanding protection of a distributed generation with respect to a feeder connected to an electrical grid is disclosed. The apparatus includes a sensor adapted to generate a voltage signal representative of an output voltage and/or a current si... | 03/21/2006 |
| 6930458 | Apparatus for controlling deceleration of DC motor An apparatus for controlling deceleration of a DC motor which is driven in a forward operating direction with a forward-drive electric current applied thereto by a forward driving device, wherein the forward motor driving device applies the forward-drive electric cu... | 08/16/2005 |
| 6756756 | Phase detector motor start switch In an AC motor having a main winding connectable to an AC power source for supplying running torque, and having a start winding connectable to the AC power source for supplying starting torque, a start switch is provided for connecting and disconnecting the start wi... | 06/29/2004 |
| 6219623 | Anti-islanding method and apparatus for distributed power generation The invention in the simplest form is a method and apparatus for reliably protecting against island situations with one or multiple power sources connected to an electric distribution grid. The method and apparatus detects variations in the voltage and fr... | 04/17/2001 |
| 4996469 | Electric motor controller with bypass contactor A three-phase motor controller includes a bidirectional thyristor switch to couple each phase of an electrical supply to a motor. The motor is started by rendering the thyristors conductive during successively greater portions of each cycle of AC electric... | 02/26/1991 |
| 4990844 | DC braking of inverter-driven AC motors A DC braking system for an inverter-driven induction motor, (e.g., three-phase). When a braking command occurs, the normal gating sequence of the inverter stops. Mode 1 of the braking procedure starts. In Mode 1, two semiconductor phase switches of the gr... | 02/05/1991 |
| 4978897 | Motor controller with an improved stopping technique An electric motor has first, second and third stator windings supplied by a source of alternating voltage having three phases A, B and C, respectively. A separate thyristor switch assembly couples each stator winding to an alternating voltage phase when s... | 12/18/1990 |
| 4862052 | Method for stopping an electric motor An electric motor is braked by sensing the polarity of voltage of the alternating electricity for powering the motor and sensing the polarity of the voltage induced in the motor by the back electromotive force. When these polarities are opposite the elect... | 08/29/1989 |
| 4833386 | Apparatus and method for braking an electric motor An electric motor is coupled to the power lines by thyristors. The motor is braked by triggering the thyristors at the proper times to produce a electro-magnetic field within the motor which opposes the residual magnetic field of the rotor. The proper tim... | 05/23/1989 |
| 4712054 | Controller with two modes of braking induction motors To a controller utilizing thyristors have been added delayed resetting circuits connected to timing circuits for enabling delayed firing, and also circuits for inverting polarity of error signal in order to accommodate regenerative and reverse-plug brakin... | 12/08/1987 |
| 4687982 | Instant reversing circuit In a single phase AC motor having a main winding (1) and an auxiliary winding (2) both connectable to an AC power source (4), and having a start switch (24, 49) for automatically connecting and disconnecting the auxiliary winding to and from the AC source... | 08/18/1987 |
| 4486692 | DC Motor control circuit for drop-out of stopping pulses in recorder A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whos... | 12/04/1984 |
| 4438382 | Three phase AC motor controller A motor controller for a three phase AC motor (10) which is adapted to operate bidirectionally from signals received either from a computer (30) or a manual control (32). The controller is comprised of digital logic circuit means which implement a forward... | 03/20/1984 |
| 4246525 | Motor control system A system for accurately stopping a motor operated positioning device permits satisfactory motor tolerance limits for economical production by incorporation of a processor controlled motor plugging routine. The plugging routine includes an initial reverse ... | 01/20/1981 |
| 3940676 | Damping control for positioning apparatus A positioning apparatus includes a platen and a head independently movable relative to the platen. First and second coils having a particular phase relationship are disposed relative to each other on the head are independently energized to produce first a... | 02/24/1976 |
