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9041402 Detecting an abnormality of a switch in a high voltage electrical substation  
There is provided a method for determining an abnormality during operation of a high voltage disconnect switch, the method comprising: determining a current position of an arm of the high voltage...
9030209 Failure detecting apparatus for signal detection apparatus  
A failure detecting apparatus that detects an isolation failure between a plurality of coils included in a signal detection apparatus. The failure detecting apparatus includes a voltage applying...
9018970 Method of testing partial discharge of rotating electrical machine driven by inverter  
In a rotating electrical machine, a conductive foil or conductive rubber is applied to the surface of insulation layer of a conductor series connection area or to the surface of insulation layer...
8884628 Systems, methods, and apparatus for monitoring a machine  
Systems, methods and apparatus for monitoring rub detection in a machine are provided. An electrical signal may be provided for transmission to and into a component of the machine. A capacitance...
8754639 Transformer testing  
A method of testing a transformer prior to installation in a high-pressure environment wherein the transformer comprises a transformer core comprising a stack of a plurality laminations, is...
8736276 Ripple spring and diagnostic method therefor  
A ripple spring is provided having one or more conductive layers, and one or more non-conductive layers. The conductive layers and the non-conductive layers are laminated together to form a...
8664962 Winding method and winding structure of stator for rotation detector, and electric motor comprising rotation detector  
The N1(s) turns of a first output winding is divided by a split ratio α into N1a(s) turns of a lower-layer first output winding and N1b(s) of an upper-layer first output winding. The lower-layer...
8653850 Apparatus and method for testing number of turns on coil  
An apparatus for testing number of turns, used for testing the number of turns of a winding coil on an electrical machine stator with concentrated winding, comprising: a base (6); a rod-shaped...
8604804 Method and structure of winding of stator for rotation detector, and electric motor comprising rotation detector  
The N1(s) turns of an output winding is divided by a split ratio α into N1a(s) turns of an output winding (1a) and N1b(s) turns of an output winding (1b). The output winding (1a) is continuously...
8575879 Methods, systems and apparatus for controlling a multi-phase inverter  
Embodiments of the present invention relate to methods, systems, a machine-readable medium operable in a controller, and apparatus for controlling a multi-phase inverter that drives a multi-phase...
8552757 Method for detecting a fault in an induction machine  
The invention concerns a method for detecting a fault in a rotating field machine, in which current components are analysed in a flux-based, particularly rotor-flux-based, coordinate system a...
8473228 Detection of rotor side anomaly in an induction machine  
A method for detecting an anomaly in an induction machine includes obtaining or receiving a signal from the induction machine; processing the signal so as to obtain a low frequency signal, then...
8441264 Station for detecting winding products and method for detecting inter-turn short circuit  
A detecting station of a winding product and a method for detecting an inter-turn short circuit are provided. The method includes following steps. First, a high voltage pulse is input to two ends...
8405403 Determining solenoid health  
A health monitoring arrangement for a solenoid includes an armature for coupling to the solenoid, the armature being displaceable proportional to a driving current applied to the solenoid. A...
8405339 System and method for detecting fault in an AC machine  
A system and method for detecting a rotor fault condition in an AC induction machine is disclosed. The system includes a processor programmed to receive voltage and current data from an AC...
8378691 Self-guiding instrument carrier for in-situ operation in a generator  
Removal of the rotor of a large electrical machine is costly and time consuming, and in particular the outage time of a power plant, which is needed for the removal of a generator rotor, is very...
8339142 System for diagnosing sensors to find out abnormality therein  
In an abnormality diagnosing system for first and second current sensors for measuring a current, an obtaining unit obtains at least one pair of measured values of the first and second current...
8115494 Systems, methods, and apparatus for rub detection in a machine  
Systems, methods and apparatus for monitoring rub detection in a machine are provided. An alternating current voltage signal may be transmitted or communicated to at least one component of the...
8072169 Method of controlling washing machine and motor  
A method of controlling a washing machine and a motor determines whether a BLDC motor is in a normal state in software without hardware and a user is notified of an abnormal state of the BLDC...
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...
8050878 Method and system for estimation of source impedence on electrical distribution lines  
A device and method for dynamically determining an impedance of a network is disclosed. The device includes at least a processing system for measuring a network voltage and network current when...
8019569 Method for checking a valve  
A valve has a valve piston, at least one coil and at least one magnetized component. An induction voltage is induced in the at least one coil, by a movement of the valve piston in the valve...
7954391 Method for testing the functionality of armatures  
The disclosure relates to a method for testing the functionality of armatures, e.g., of safety armatures, in process control systems which are assigned a test device for implementing partial...
7795898 Fan having function for detecting fault in the fan  
A fan having a function for detecting a fault such as a breakage or a loss of a rotating part of the fan as well as reduction in the rotational speed of the fan, the function being not affected by...
7722310 System and method for measuring clearance between two objects  
A system for measuring clearance between a first object and a second object is provided. The system includes a sensor configuration to generate a first signal representative of a first sensed...
7705623 Method and device for detecting interlaminar short circuits  
A method for determining a short circuit between at least two stator laminates in an electrical machine having a rotor mounted on a shaft and a stator, includes rotating the rotor on the shaft...
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...
7592772 Stator inter-turn fault detection of synchronous machines  
A fault detection system using field current and rotor search coil voltage harmonics is provided. The technology is capable of detecting an inter-turn fault unambiguously and rapidly in a...
7499815 Machine radial stack gap generation and clearance management system and method  
A system and method for readily generating radial clearance data for a radial clearance between locations on at least two parts in a rotating machine includes rendering an image of a cross section...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
6794884 Method and system for evaluating core stack pressure  
A method for evaluating core stack pressure includes: positioning a magnetic yoke near the core, the magnetic yoke being wound by an excitation winding; supplying current to the excitation winding...
6774664 Method for automated measurement of the ohmic rotor resistance of an asynchronous machine  
Method of automated measurement of the ohmic rotor resistance (Rr) of an asynchronous machine (1) controlled via an inverter (8) while being acted upon by a non-rotating field, the method...
6756788 Laminated core contact detection method and system  
A core contact (meaning core fault or keybar contact) detection method comprises: positioning at least two electrically conductive plates near at least two respective laminations of a laminated...

Matches 1 - 50 out of 166 1 2 3 4 >