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| Number | Title | Issue Date |
| 7248015 | Variable speed motor control circuit A control system and method for controlling the speed of a PSC motor having an auxiliary winding configured to provide torque for initial motor startup and a run winding configured to provide continuous motor operation. The motor is coupled to a capacitor configured... | 07/24/2007 |
| 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 |
| 7103485 | Method for compensating secondary current of current transformers A method for preventing the unwanted maloperation of a protective relay system that is caused by the imprecise detection of an actual secondary current value resulting from a measured secondary current being distorted comprises the steps of calculating difference va... | 09/05/2006 |
| 7034499 | Electromagnetic motor An electromagnetic motor with increased torque. The motor has a rotor coil configured to generate a magnetic field. At least two stator coils are connected in series with the rotor coil. Each of the stator coils is configured to generate a respective magnetic field.... | 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 |
| 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 |
| 6304046 | Driving control circuit of a hood motor A driving control circuit of a hood motor, including: a hood motor section rotatably driven for ventilating the inner portion of a system; a rectifier circuit section for supplying direct current power to the hood motor by rectifying alternating current p... | 10/16/2001 |
| 5359154 | Conveyor apparatus having plural conveyors with equalized conveying speeds controlled by an inverter means An inverter controlled conveying/measuring apparatus according to the invention includes a conveyor (3) for conveying an object (W) of measurement. The conveyor (3) is driven by an AC motor (M2). Inverter (20) controls and operates the conveyor (3) at a g... | 10/25/1994 |
| 5325034 | Emergency power system for capacitor start motors An emergency power circuit powers an induction motor which has at least first and second windings. The motor is normally operating at a normal speed determined by connection to commercial frequency power line, but which is subject to failure. During failu... | 06/28/1994 |
| 5300870 | Three-phase motor control A three-phase induction motor is driven efficiently from a single-phase power supply by reconnecting the motor windings and using two or more capacitors to provide balanced currents and voltages in the windings at preselected values of power. A similar me... | 04/05/1994 |
| 5293108 | Static phase converter A relatively compact static phase converter is adapted to be disposed within the housing of an appliance, such as a refrigeration unit, making it thus suitable for residential as well as commercial applications. The static phase converter is formed as a m... | 03/08/1994 |
| 5075611 | Single phase AC motor control device A control device is provided for an alternating current motor operating in single phase and having first and second windings coupled so that they are shifted in phase with respect to each other. A control unit includes first and second switching elements ... | 12/24/1991 |
| 4761602 | Compound short-circuit induction machine and method of its control An induction machine having a stator carrying phase coils divided into at least two independently fed sets of coils, with a rotor or armature carrying one or more loop members, each of which is a short-circuited, continuous isolated loop conductor member ... | 08/02/1988 |
| 4745348 | Apparatus for starting and running a plurality of three-phase motors from a single-phase power source An apparatus for starting and running a plurality of three-phase motors from a single-phase power source is described. Two of the main coils of a three-phase motor are used to run the motor as a single-phase induction motor. The third coil of a three-phas... | 05/17/1988 |
| 4653285 | Self-calibrating control methods and systems for refrigeration systems Disclosed are refrigeration system control systems and methods for compressor motor protection and defrost control. The disclosed systems and methods are generic in the sense that they are self-calibrating and so may be employed in a variety of different ... | 03/31/1987 |
| 4651079 | Pulse width modulated inverter system for driving single phase a-c induction motor at a constant voltage/frequency ratio A sinusoidally weighted pulse width modulated switching signal may be developed, for operating an inverter to apply sinusoidal voltage to a single phase a-c induction motor, by comparing a triangular voltage waveform of fixed frequency with a variable fre... | 03/17/1987 |
| 4642545 | Static phase conversion circuits for three-phase motors A three-phase A.C. motor having three stator windings with stator winding power input terminals T1, T2 and T3, is energized from a single-phase A.C. line through a static phase conversion circuit that connects terminals T1 and T2 directly to the single ph... | 02/10/1987 |
| 4409532 | Start control arrangement for split phase induction motor A control arrangement for a reversible alternating current split phase induction motor of the type having a start winding electrically connected in parallel with a run winding, which controls the duty cycle of current in the start winding to selectively i... | 10/11/1983 |
| 4211962 | Brushless d-c motor A brushless d-c motor having an electric commutation circuit in which the motor and circuit are inter-connected by a mating connector is disclosed. The mating parts of the connector may be connected in two configurations. In one configuration, the motor r... | 07/08/1980 |
| 4160196 | Two-phase AC electric motor control circuit A control circuit of a two-phase AC electric motor wherein the windings and two series capacitors are delta-connected, the winding mid point is brought to one terminal of the power source, and the winding leads connected to the capacitors are brought to t... | 07/03/1979 |
| 4140950 | Control system for two-phase reversible motor By closing a series-connected first solid state switch, such as a triac, AC line voltage is applied directly to the first of two field windings of a two-phase reversible AC induction motor to drive the motor in one of its two directions. The shifted phase... | 02/20/1979 |
| 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 |
| 4117383 | Electrical control circuits An electrical control circuit for a single phase induction motor which uses relay operated reversing contacts to ensure that the motor reverses its direction of rotation upon each energization thereof.... | 09/26/1978 |
| 3971971 | Electric hoist control and braking system The invention relates to control and braking systems for apparatus driven by single and polyphase alternating current induction motors. The system prevents destructive and dangerous overspeeding where the nature of the driven load is such that it can furn... | 07/27/1976 |
