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| Number | Title | Issue Date |
| 8054084 | Methods and systems for diagnosing stator windings in an electric motor Systems and methods are provided for identifying a fault condition in stator windings in an electric motor. A method comprises applying a first signal at a first electrical angle to the stator windings and measuring a second signal from the stator windings in respon... | 11/08/2011 |
| 7605592 | Laminated core testing device A laminated core testing device for testing laminated cores in a generator is provided. The laminated core testing device includes an exciting winding situated parallel to a rotation axis of the generator and connected to a secondary alternating current generator, a... | 10/20/2009 |
| 7414425 | Damping control in a three-phase motor with a single current sensor While a PWM-controlled, FET-switched three-phase motor is operating in a mechanical damping mode, a single current sensor is used to measure current in the motor. When mechanical feedback into the motor exceeds a predetermined threshold, a bank of the FET switches c... | 08/19/2008 |
| 7397222 | On-line testable solid state reversing DC motor starter A solid state reversing DC motor starter that is testable on-line and satisfies the requirements for nuclear safety grade equipment. The motor starter employs a bridge of solid state switches which connect the polarity of the motor winding to conform to the desired ... | 07/08/2008 |
| 7382138 | System and method for non-destructive testing of rotors A method is provided for testing an electrical characteristic of a rotor. In one embodiment, the method may include applying current to the rotor, measuring voltage drop between first and second positions on the rotor, and evaluating the electrical characteristic of... | 06/03/2008 |
| 7347697 | Active connector Interconnection assemblies which adjust their alignment and performance through the use of control feedback from the data transferred through the assemblies. ... | 03/25/2008 |
| 7339394 | Current sensing in a two-phase motor A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first step 100 includes reading a duty cycle... | 03/04/2008 |
| 7256701 | Motor driver A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply (1) is rectified by a first rectifying circuit (D1 to D6) and smoothed by a capacitor... | 08/14/2007 |
| 7248730 | Certified paper discriminating apparatus An apparatus configured to discriminate the genuineness of a certified paper by exposing the paper to a light source and transporting the paper through an environment of an alternating-current electromagnetic field. Light detectors detect the light reflected from th... | 07/24/2007 |
| 7239149 | Search coil mount for facilitating inspection of a generator rotor in situ A mount is for installing a probe, such as for example, a search coil, in a variety of locations and orientations within an electrical generator, without requiring the rotor of the generator to be removed. The mount includes a block having a longitudinal hole and a ... | 07/03/2007 |
| 7239103 | Synchronous motor startup lock detection circuit and method A startup failure detection system provides an indication of motor startup failure based on a flux amplitude signal value. The flux amplitude signal is derived from motor flux estimations in combination with a rotor angle estimation. The flux amplitude signal value ... | 07/03/2007 |
| 7239168 | Current sensing in a two-phase motor A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first step 100 includes reading a duty cycle... | 07/03/2007 |
| 7212010 | Method and device for detecting a contact point on a shaft of a rotating machine A method and a device for detecting a touching point (i.e. contact point) on a machine having a rotating shaft, in which the touching point (i.e. contact point) on the shaft is determined during operation. This is performed by measuring the grounding state of the sh... | 05/01/2007 |
| 7208971 | Manual probe carriage system and method of using the same A probe support carriage for use during probing an electrical device includes a body, means for supporting and positioning the body, a plurality of flux sensors and a position sensor. The body has a first end and a second end. The plurality of flux sensors are opera... | 04/24/2007 |
| 7126368 | System and method for detecting motor coil-to-coil faults A system and method detects coil-to-coil faults in an electric motor having a plurality of coils. The method includes applying a square wave signal to a first coil of the motor, connecting a capacitor and a resistor between ground potential and a second coil of the ... | 10/24/2006 |
| 7118446 | Grinding apparatus and method A grinding assembly for shaping work pieces that includes one or more grind spindles. Each of the grind spindles include two independent grinding wheels driven by a single spindle drive. The grind spindles translate horizontally to perform both edge and face grindin... | 10/10/2006 |
| 7111983 | Temperature detection method and apparatus for inverter-driven machines A resistance temperature detector device and system are provided for measuring the temperature adjacent to windings within a stator assembly. The resistance temperature detector comprises a resistive element enclosed within a plurality of insulative layers, includin... | 09/26/2006 |
| 7109742 | Current sensing in a two-phase motor A method and apparatus for measuring current by a single sensor for two motor phases driven by first and second set of switches to drive respective first and second phases of a motor under control of PWM signals. A first step 100 includes reading a duty cycle... | 09/19/2006 |
| 7098560 | Flux probe for electric generator A flux probe (100) for measuring the rotor flux of an electric generator (10). The probe (100) is affixed to a probe carrier (102) and held within a stator coil slot (62) by affixing the carrier (102) to two opposing grooves... | 08/29/2006 |
| 7091738 | Inspection system for active matrix panel, inspection method for active matrix panel and manufacturing method for active matrix OLED panel An inspection system for inspecting characteristics of an active matrix panel before formation of OLEDs includes: a roller contact probe having a conductive material on at least a surface thereof and sequentially contacting pixel electrodes formed on the active matr... | 08/15/2006 |
| 7081760 | Method of diagnosing a broken bar fault in an induction motor A method for diagnosing induction motor broken bar faults using the resultant magnetic field pendulous oscillation phenomenon is disclosed. Broken bar faults cause the resultant magnetic field of an induction motor to possess a pendulous oscillation modulating its i... | 07/25/2006 |
| 7069173 | System and method for determining an angular position of a rotor and a radial position of the rotor A system and a method for determining an angular position of a rotor and a radial position of the rotor are provided. The rotor has either a slot or a protrusion on the rotor. The rotor is centered about a center point. The method includes generating a first signal ... | 06/27/2006 |
| 7064504 | Control apparatus for brushless DC motor A control apparatus for a brushless DC motor that rotatably drives the brushless DC motor including a rotor having a permanent magnet, and a stator having stator windings of a plurality of phases that generate a rotating magnetic field for rotating the rotor, by a c... | 06/20/2006 |
| 7042229 | System and method for on line monitoring of insulation condition for DC machines Insulation condition monitoring systems and methods for a rotating DC electric machine, the method comprising: measuring a first set of values for an instantaneous differential current and an instantaneous voltage during operation of the rotating DC electric machine... | 05/09/2006 |
| 7030623 | Electrical short tracing apparatus and method A vehicle testing apparatus and method which facilitates tracing and isolating of short circuits. The tester preferably provides a user-selected constant current level (i.e. 1, 3 and 6 amperes) for driving a vehicle short under test at a constant current level compa... | 04/18/2006 |
| 7023219 | A/C generator rotor test apparatus An assembly is provided for testing a circuit of a rotor of an AC generator. The assembly includes a base, a rack, a coil housing, one or more coils, and a rotor stand. The rack is coupled to the base and the coil housing is coupled to the rack. The one or more coil... | 04/04/2006 |
| 6975312 | Computer system having network connector and method of checking connection state of network cable therefor A computer system having a network connector to which a network cable is connected, including a displaying part displaying a connection state of the network cable; a signal processing part processing a signal inputted through the network connector; and a control par... | 12/13/2005 |
| 6963216 | Method and apparatus for detecting shorted rectifying control elements of an engine driven power source for welding-type system An apparatus for electrical protection of an electrical system includes a protection circuit for detecting when silicon controlled rectifier (SCR) or other control elements in an engine driven generator of a welding-type power source have failed. In such an apparatu... | 11/08/2005 |
| 6960928 | Electromagnetic coupling based motor plug detect system and method A method and system of detecting the presence of an electric machine attached to a solid state drive using high speed, low energy pulses. The system and method include generating a pulse signal to a selected driven phase winding; and detecting the pulse signal for t... | 11/01/2005 |
| 6956459 | Sensing apparatus for blown fuse of rectifying wheel and associated methods A blown fuse proximity sensing device 40 is for use with a rectifying wheel 37 of a type including rectifying diodes 38 and associated fuses 42. Each fuse 42 may include a housing 51, a fuse element 52 carried by the ... | 10/18/2005 |
| 6927598 | Test probe for electrical devices having low or no wedge depression A probe for use in detecting abnormalities in an electrical device having a wedge depression of no more than 100 mils. The probe includes a solid core surrounded by a sense coil. The ends of the core are arranged in a contact-free, spaced relationship between and at... | 08/09/2005 |
| 6924650 | Device for generator diagnosis with built-in rotor In a device for the investigation of components of a generator which border on a machine air gap (29) between stator and rotor (22), with the rotor (22) built in, by means of at least one moveable inspection probe (35), a simple, flexible... | 08/02/2005 |
| 6922060 | Method for detecting partial conductor short circuits, and device for performing and using the method In a method for detecting partial conductor short circuits (7) in a conductor (11) including plural mutually insulated partial conductors (5) in which the partial conductors (5) are connected together at one or both ends of the conductor ... | 07/26/2005 |
| 6911838 | Online detection of shorted turns in a generator field winding A method for detecting a shorted turn in a synchronous machine having a rotor using a magnetic flux probe is disclose having the steps of: monitoring a signal from the flux probe during on-line operation of the machine; integrating the flux probe signal to generate ... | 06/28/2005 |
| 6909290 | Rotor angle detecting apparatus for DC brushless motor An inspection voltage imposer generates an inspection voltage by multiplying fundamental voltage string data in which a certain voltage output pattern where an average of output voltage levels in one period becomes 0 is set by data of a modulation signal whose value... | 06/21/2005 |
| 6906530 | Apparatus and method to detect moisture A method and apparatus for detecting moisture. An oscillatory electrical signal S1 generated by an oscillator is propagated into a body that includes an electrically insulative material. A signal due to S1 emerges from the body as an oscillator... | 06/14/2005 |
| 6903556 | Method and apparatus for testing laminated cores of electrical machines There is provided an apparatus and associated method for the testing of a laminated core (100) for an electrical machine. The apparatus supplies an excitation signal to the winding (102) of the electrical machine which is of a frequency higher than the... | 06/07/2005 |
| 6900657 | Stall detection circuit and method A stall detection circuit and method for a stepper motor. The circuit has an H-bridge configuration with an additional circuit pathway to ground being connected at a point between two center windings. During the transition between step sequences, the circuit employs... | 05/31/2005 |
| 6815957 | Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts The present invention relates to a method, an apparatus and a computer program for inspecting laminated iron cores (1) of electrical machines for interlamination shorts, in which the laminated iron core (1) is magnetized by means of an auxiliary windin... | 11/09/2004 |
| 6798112 | Armature ground locating test process and equipment A process and an apparatus for locating ground faults in motor armatures includes shorting a commutator of a motor armature with a shorting strap and connecting a variable voltage AC power supply and a load in series between the commutator and a core of the motor ar... | 09/28/2004 |
