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| Number | Title | Issue Date |
| 7272302 | PSC motor system for use in HVAC applications with field adjustment and fail-safe capabilities A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides... | 09/18/2007 |
| 7249931 | High efficiency air conditioner condenser fan with performance enhancements Twisted blades for outdoor air conditioner condensers and heat pumps that improve airflow efficiency to minimize operating power requirements. The blades can run at approximately 850 rpm to produce approximately 1930 cfm of air flow using approximately 110 Watts of ... | 07/31/2007 |
| 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 |
| 7075268 | System and method for increasing output horsepower and efficiency in a motor A system and method are provided to increase the horsepower of an induction motor. One technique for increasing the horsepower of a motor is to connect the motor to a variable speed drive that is providing an output voltage and frequency greater than the standard li... | 07/11/2006 |
| 7068009 | Drive arrangement, especially for a lifting mechanism and/or a traveling drive The invention concerns a drive arrangement of a lifting gear and/or a traveling gear, with a pole-reversible rotary-current motor with windings for at least two different actuating speeds, with a pole switching element connecting the rotary-current motor to a voltag... | 06/27/2006 |
| 6977478 | Method, system and program product for controlling a single phase motor A controller is provided for transitioning a drive signal to a single phase motor between a square wave and pulse width modulation modes, wherein the drive signal is in square wave mode at low motor frequencies and in pulse width modulation mode during normal operat... | 12/20/2005 |
| 6952088 | PSC motor system for use in HVAC applications with improved start-up A motor control system for use in heating, ventilation and air conditioning applications including a blower and a motor coupled to drive the blower, an inverter coupled to provide energization to the motor, a relay capable of coupling the motor to the output of the ... | 10/04/2005 |
| 6815926 | Single phase induction motor with partially shared windings A single phase, three-speed induction motor having 4, 6, and 8-pole speed configurations. In one embodiment, the motor is constructed and arranged to be used in connection with a washing machine. The 8-pole speed winding shares a portion of the 4-pole speed winding,... | 11/09/2004 |
| 6693403 | Power failure tolerant motor drives for dual voltage systems A dual voltage motor drive is disclosed. In an exemplary embodiment, the motor includes a rotor assembly, rotatingly disposed within a stator assembly, and a plurality of motor phase windings configured to be energized in a determined sequence to cause a ... | 02/17/2004 |
| 6051952 | Electric motor speed and direction controller and method A motor controller for a single phase induction motor (SPIM), wherein the SPIM is driven by two windings, a line winding connected to the ac line and a control winding driven by the controller. The SPIM torque and hence the speed and direction is controll... | 04/18/2000 |
| 6020725 | Self-excited asynchronous alternating current generator with paramutual inductive coupling An asynchronous alternating current motor/generator having an armature winding which includes interspersed energy coils and reflux coils which are electrically and inductively isolated from each other, but which are paramutually inductively coupled throug... | 02/01/2000 |
| 5867005 | AC motor winding circuit A winding circuit for use with different input signals includes a first main winding, a second main winding, and an auxiliary branch having an auxiliary winding permanently and serially connected to a capacitor. The windings and auxiliary branch are alter... | 02/02/1999 |
| 5359272 | Sensorless drive control and method for doubly-fed reluctance motor A doubly-fed reluctance motor (10) has a primary winding set (20) and a secondary winding set (22). A drive control (32) for the motor includes a connection (36) to the primary winding so primary winding current and voltage signals (ip, Vp... | 10/25/1994 |
| 5218283 | AC motor drive system with a two phase power supply A motor drive system for driving a conventional single phase PSC motor from a two-phase power source which allows for convenient motor direction reversal. In one embodiment, the PSC motor is supplied from a three-phase inverter that is controlled to gener... | 06/08/1993 |
| 4959573 | Electromagnetic induction machines having regulated polar magnetic symmetry In an induction motor rotor windings are connected together in a squirrel cage or a wound rotor Ɗ configuration and stator windings are connected in series across a source. A capacitor is connected in parallel with one of the stator windings and this com... | 09/25/1990 |
| 4906911 | Electrical machine driven by a pulse-controlled a.c. converter An electrical machine driven by a pulse-controlled a.c. converter contains multiple phases subdivided into a number of nࣙ2 equivalent phases sections that are extensively magnetically decoupled relative to each other. Each phase section is fed by a sepa... | 03/06/1990 |
| 4695782 | System for insuring rotational direction for an alternating current motor A system for insuring the correct rotational direction of a permanent magnet, bi-directional alternating current motor. A sensor driven by the output of the motor provides a time varying voltage signal that is differentiated and detected. The signal is th... | 09/22/1987 |
| 4532458 | Variable-speed electrical machines An arrangement to provide variation of the speed or other operating parameters of an electrical machine without connection to the rotor. The machine is of the induction type having a winding in separate parts to create a flux movable in the air-gap differ... | 07/30/1985 |
| 4137488 | Modified induction motor for use in a three phase power system An electric motor arrangement in which a modified induction motor is operated as a three-phase motor by connecting one of the input phases to the junction of the two motor windings, and by connecting the other two input phases to the other sides of the tw... | 01/30/1979 |
