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Class 324/772 - Motor or generator fault tests


Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter including fault tests of (a) prime mover
No. of applications: 74
Last issue date: 10/14/2010


1    
Application No.Application TitleIssue Date
20100259274Testing an inductive load of a device using a modulated signal
A device has built-in inductive load testing capabilities. The device includes a device housing, an inductive load disposed within the device housing; and test circuitry disposed within the device housing. The test circuitry is constructed and arranged to effectuate app...
10/14/2010
20100244887METHOD FOR DETECTING A STEP LOSS CONDITION
A method for detecting and correcting for a step loss condition. A back electromagnetic force signal is measured and compared to a reference voltage. The motor continues operating and the back electromagnetic force signal is measured again and compared to the reference ...
09/30/2010
20100244760SYSTEM AND METHOD FOR DETECTING LOSS OF ISOLATION WHILE AN AC MOTOR IS OPERATING
Methods and systems are provided for detecting loss of isolation of a motor, connections, or phase cables while an AC motor is operating. The system includes a power supply that is substantially isolated from the ground or chassis having a power supply voltage, and a po...
09/30/2010
20100201396METHOD AND DEVICE FOR OFF-LINE TESTING OF ELECTRIC MOTORS
A method for off-line testing of an electric motor is disclosed. The motor having at least one stator winding, and a rotor arranged along a rotation axis. The method includes applying a periodic test signal to the at least one stator winding; collecting first measuring ...
08/12/2010
20100182037Diagnostic Method For Load-Testing Self-Excited Three-Phase Generators in a Motor Vehicle
The invention relates to a diagnostic method for self-excited generators, in which a diagnostic decision is made by means of field current monitoring....
07/22/2010
20100182038Setup and method for testing a permanent magnet motor
A test setup for a permanent magnet motor provides a method for identifying symmetry or asymmetry in the magnetic fields of the motor's permanent magnets. The setup comprises a test circuit that includes a fixed reference node that provides a stable reference to which t...
07/22/2010
20100162828TESTING SYSTEM AND METHOD FOR MOTOR
A testing system for testing a temperature characteristic of a first motor includes a second motor, a controller, a driver, a load, a temperature sensor, and a temperature recorder. The controller provides a drive command for the driver to drive the second motor. The se...
07/01/2010
20100141294WINDING DIAGNOSTIC SYSTEM AND METHOD
A winding diagnostic system is provided. The system includes a core having a winding to generate a magnetic flux. A retention device for holding the winding in place is provided. The system further includes a sensor disposed in a sensing relation with the retention devi...
06/10/2010
20100117679TEST APPARATUS, SYSTEM, AND METHOD HAVING A MAGNETIC FEATURE
A test apparatus involving a rotor coupled to a drive shaft, wherein the drive shaft is mechanically coupled to a drive system; a stator coupled to a brush holder; a brush held by the brush holder, wherein the brush is held in contact with the rotor; a housing for suppo...
05/13/2010
20100102846ROTOR/STATOR RELATIVE POSITION DETERMINING METHOD AND APPARATUS
A data signal indicative of a gap between a sensor and at least one of a surface of a rotor and a surface of a stator rotating relative to the sensor is sent to a computer processor. The computer implements defining a plurality of lowest values of the data signal over a...
04/29/2010
20100066400Method and apparatus for determining the operating condition of generator rotating diodes
A controller (500) in an electric drive system is used to determine the operating condition of array of rotating diodes (302B) within a generator (204). During operation, the controller (500) receives a set of generator inputs, a set of machi...
03/18/2010
20100066551Method and apparatus for power generation failure diagnostics
A controller (500) in an electric drive system is used to develop power generation failure diagnostics. During operation, the controller (500) receives a set of generator inputs, a set of machine parameters, and a set of diagnostic values. Next, the contro...
03/18/2010
20100045335METHODS AND SYSTEMS FOR EVALUATING PERMANENT MAGNET MOTORS
A method for evaluating a permanent magnet motor, which includes a rotor with a plurality of magnets mounted thereon, and a stator with a plurality of windings in proximity to the rotor and coupled to an inverter, includes spinning the motor such that a voltage is induc...
02/25/2010
20100033166Method For Estimating The Magnetization Level Of One Or More Permanent Magnets Established In One Or More Permanent Magnet Rotors Of A Wind Turbine Generator And Wind Turbine
A method for estimating the magnetization level of one or more permanent magnets established in one or more permanent magnet rotors of a wind turbine generator includes the steps of: establishing one or more magnetization sensors at the stator of the generator, connecti...
02/11/2010
20090322373PERMANENT MAGNET ROTOR CRACK DETECTION
A method and apparatus for permanent magnetic (PM) rotor crack detection includes a sensor which monitors magnetic flux distribution of the PM rotor and identifies the presence of a crack in the PM rotor when a magnetic flux distribution change or anomaly is detected....
12/31/2009
20090289656Dry-type high-voltage load system apparatus and method of preventing chain breaking and arc discharge for use therewith
A dry-type high-voltage load system apparatus has a space-saving structure, which is resistant to chain breaking, arc discharge and vibration, and a method of preventing the chain breaking and the arc discharge for use with the system apparatus. The system apparatus inc...
11/26/2009
20090289145ELECTROMECHANICAL ACTUATING ASSEMBLY
An electromechanical actuating assembly (100), operable in a plurality of fault-tolerant modes to accommodate at least the most probable fault situations. In the M1D1-only mode, actuator-moving power is transferred only through the first drivetrain (400A) ...
11/26/2009
20090271060Method And Apparatus For Detecting An Insufficient Phase Current In A Permanent Magnet Synchronous Motor
A method is provided for detecting an insufficient or missing phase current in a permanent magnet synchronous motor, and includes determining a composite vector position of a combined three-phase phase current with respect to a stationary portion of the motor, and assig...
10/29/2009
20090256584GAP INSPECTION APPARATUS
An apparatus for inspection of a gap between two surfaces, at least one of which is ferromagnetic, for example in a generator, includes a sensor platform (26) for one or more sensors (26a) and an elongated mount (23), which can be moved out, ...
10/15/2009
20090243647Non-Invasive monitoring and diagnosis of electric machines by measuring external flux density
System and methods for monitoring electric machines are provided. A magnetic field associated with the electric machine is measured at one or more points external to the electric machine, wherein a respective magnetic field value is associated with each of the one or mo...
10/01/2009
20090219050METHOD FOR DETECTING A MALFUNCTION IN AN ELECTROMAGNETIC RETARDER
A method for detecting a malfunction in an electromagnetic retarder. More specifically, the method relates to a retarder comprising: stator primary coils (8); a control unit (19) for injecting a current into the primary coils (8), the current having...
09/03/2009
20090179663METHOD 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 relative to the stator so to pass a magnetic stator flux, varying over time, ...
07/16/2009
20090179605Resolver Abnormality Detection Circuit
An abnormality detection circuit for a resolver outputs a rotation angle signal corresponding to a rotation angle of a rotor from a resolver winding. In the abnormality detection circuit, the resolver abnormality detection circuit applies a specified signal to one termi...
07/16/2009
20090153093METHOD AND CONTROLLER FOR DETECTING A STALL CONDITION IN A STEPPING MOTOR DURING MICRO-STEPPING
A method is provided for detecting a stall condition in a stepping motor. The stepping motor has two coils and a rotor, and is micro-stepped by substantially continuously driving both of the two coils with out-of-phase time varying voltages. The method includes stepping...
06/18/2009
20090146680SELF-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 expensive and should be minimized. To avoid opening of the generator for in...
06/11/2009
20090107255Test Bench And A Method For Testing Wind Turbine Equipment
The invention relates to a test bench for testing wind turbine equipment. The test bench comprises one or more load applying means directly and/or indirectly applying load to the equipment, drive means of the test bench for rotating an input shaft of the equipment at le...
04/30/2009
20090107256Wind Turbine Testing System
A wind turbine testing system is disclosed for testing at least a part of the nacelle components of a wind turbine system when mounted on a load carrying structure of a nacelle, said wind turbine testing system comprising a test bench being arranged to hold said load ca...
04/30/2009
20090096463HYBRID VEHICLE TESTING SYSTEM AND METHOD
In a hybrid vehicle, first, an engine is locked by an engine shaft locking mechanism. A first motor is connected to a first inverter circuit and a second motor is connected to a second inverter circuit and then both the motors are operated, and the output characteristic...
04/16/2009
20090091289STATOR 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 synchronous machine. The internal asymmetry of the machine that has adversely affe...
04/09/2009
20090066360METHOD FOR DETERMINING AN INDUCTANCE OF A MOTOR
The intention is to simplify the measurement of an inductance characteristic curve of a motor. To this end, provision is made for a current (i) having a non-periodic current offset component and a periodic current component to be injected into the motor's winding so tha...
03/12/2009
20090033357Winding fault detection system
A control system is disclosed. The control system has an electric machine coupled to provide power to or receive power from a DC bus and a controller in communication with the electric machine and the DC bus. The controller is configured to receive a voltage from the DC...
02/05/2009
20090021091MOTOR DRIVE APPARATUS AND ITS INSPECTION METHOD
A motor drive apparatus includes a motor unit including an output shaft and a first terminal connecting portion; a control board including a second terminal connecting portion, and configured to control a current supply to the motor unit; a housing; a shaft supporting p...
01/22/2009
20080315909Method of detecting a malfunction of an encoder for a vehicle drive system
A method of detecting a malfunction of an encoder used in a vehicle drive system includes determining an error of a motor speed based on an estimated motor speed, wherein the estimated motor speed is a function of measured current over a predetermined interval of time. ...
12/25/2008
20080309366System and method for bearing fault detection using stator current noise cancellation
A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor program...
12/18/2008
20080303543Measuring Device
An apparatus for testing an electric motor is described. The motor comprises stator windings and a rotor arranged along a rotation axis. The apparatus is adapted to measure a physical quantity of the stator winding while the rotor is being rotated about the rotation axi...
12/11/2008
20080294360METHOD FOR DETECTING THE LOSS OF ONE OR MORE PHASES IN A PERMANENT-MAGNET SYNCHRONOUS ELECTRIC MOTOR
The present invention relates to a method implemented in a speed controller (1) to detect a loss of one phase, two phases or three phases in a three-phase permanent-magnet synchronous motor (PMSM), running or stopped at rest, said controller executing a control i...
11/27/2008
20080278341SYSTEM AND METHOD FOR MONITORING MOTOR
A system (100) for monitoring a motor (202) includes a potential-detecting module (102), a potential-comparing module (104) and a motor-monitoring module (106). The potential-detecting module is configured for measuring output potentia...
11/13/2008
20080251071Method and system for motor failure detection
Systems and methods for detecting developing faults in a flow generator or ventilator during therapeutic use thereof are provided. The motor current may be measured to estimate the torque input by the motor, while the output torque from the impeller may be determined (e...
10/16/2008
20080150573Testing Inverter Driven Electric Motor Shut-Off Path
A method for testing electric motor shut-off including injecting current into an electric motor, applying at least one of a short or an open to the electric motor for a predetermined length of time, calculating the rate of decay of the current and comparing rate of the ...
06/26/2008
20080150572Magnetic test apparatus
A magnetic test apparatus, in accordance with one embodiment, comprising a rotor coupled to a drive shaft, wherein the drive shaft is mechanically coupled to a drive system; a stator coupled to at least one brush holder; at least one brush held by the brush holder, wher...
06/26/2008
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