Matches 301 - 350 out of 505 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
4749944 Load detecting device for generator  
A load detecting device for a generator driven by an engine and supplying power to a load includes a rotary angle detector for producing a pulse signal at every predetermined rotary angle of the...
4746850 Start-up system for a synchronous motor drive  
In a load commutated inverter (LCI) motor drive, the motor is started from a rotor rest position by modulating the rotor winding with a field current at a constant rate to induce stator voltages...
4743848 Method of testing a stepping motor  
A three-phase stepping motor is automatically tested for excessive friction and winding shorts in less than four seconds. The stepping motor accelerates its rotor at a constant rate to a first...
4739184 Portable transducer simulator  
A hand-held portable transducer simulator unit connects to a vehicle's instrumentation circuitry in substitution of the vehicle's own pressure and/or temperature transducers for diagnostic checking...
4739256 Method and apparatus for testing and repairing synchronous motors  
An apparatus for testing a synchronizing control circuit for any assembly relying upon detecting the relative closeness of one voltage of varying frequency to another voltage of different varying...
4734673 Apparatus for detecting a start of an engine for a motor vehicle  
Apparatus for detecting the start and stop of an engine starter motor includes a sensor, an amplifier, a comparator, and a monostable multivibrator. When a starter motor starts and stops, magnetic...
4730164 Device for detecting abnormal conditions in a stepping motor  
In a device for detecting an abnormal condition in a stepping motor, a second phase coil is provided which is in the relation of mutual induction with a first phase coil of the stepping motor to be...
4727320 Method and apparatus for motor size determination  
A method for testing motors having separate run and start windings to verify correct motor size and to detect miswiring of the motor windings comprises the steps of measuring the start winding...
4724373 Method and apparatus for flux and torque sensing in electrical machines  
To determine the flux in the air gap of an electrical machine having distributed stator windings, the voltages across two coils of a phase belt in certain phases of the stator are measured and the...
4714878 Apparatus for forming the actual value of a torque in a three-phase synchronous machine with current-block feeding  
In two of the three phases of a synchronous machine, the feeding or driving current is measured. During 240° of an operating cycle of the synchronous machine, a reference signal is generated which...
4713741 Excitation control apparatus for rotary electric machine  
An excitation control apparatus for a rotary electric machine according to this invention is such that principal portions of an automatic voltage regulator are dualized by effectively combining...
4703258 Method of testing control devices  
A plurality of controller devices in a motor vehicle are tested via a single test line to indicate the occurrence of a function error which is stored in a corresponding device. To initiate the...
4698577 Method of digital flux reconstruction with DC elimination  
A method for developing current control signals from motor terminal voltage in the control of alternating current electric motors which utilize electric current control signals oriented to the...
4689546 Internal armature current monitoring in large three-phase generator  
A three-phase generator includes an internal neutral junction to which one end of each of the windings of the generator is connected thereby forming a wye-connected generator. An air-core current...
4687990 Brush potential curve tracer  
A device for analyzing commutating characteristics of a motor or generator includes a holder for supporting a plurality of probes adjacent a brush of the motor or generator. Measurements of...
4682103 Circuitry for testing generator output  
This invention relates to a circuitry for easily and quickly testing the output current capacity of a generator by connecting the generator as a controlled current source, applying to the...
4678990 Motor monitor signal analysis system  
A signal analysis system for a magnetic field motor monitor utilizes an analog-to-digital converter for sampling the motor magnetic field at accurately determined and equally spaced times...
4672288 Torque controller for an AC motor drive and AC motor drive embodying the same  
In an induction motor drive a signal representative of the torque T as derived by sensing only the stator armature current I, and the slip frequency f 2 and by calculating instantaneously T=I 1 2 ...
4670698 Adaptive induction motor controller  
A method of measuring induction motor parameters so that the speed and torque control of an induction motor controller may be optimized. While the motor is stopped, a test signal made up of a...
4667148 Generator air-gap flux probe for detecting shorted rotor turns  
A generator air-gap flux probe for determining rate of change of flux density includes a resilient support spanning the air gap between the stator and the rotor of a dynamoelectric machine to...
4658213 Method and apparatus for testing direct current motors and generators, electromagnetic devices, and the like  
Method and apparatus for testing D.C. motors, D.C. generators, electromagnetic devices, and the like is disclosed. An electrical circuit produces a current limited, pulsating or otherwise time...
4651086 Apparatus and method for determining the resistance of a coil connection of an electric motor winding  
A method, and apparatus, for determining the resistance of the electrical connections between coils and the bars of a commutator for electric motors as well as the resistance of the coils...
4646008 System for diagnosing an internal combustion engine  
A system for diagnosing an internal combustion engine having a starter operation sensor. A starter operation diagnosing circuit is provided to response to the output voltage of the sensor for...
4634955 Malfunction detector for detecting open-circuit condition at DC generator output terminal  
A malfunction detector for detecting an open-circuit condition at the output terminal of a vehicular DC generator is disclosed. The frequency of a signal derived from one of the armature windings...
4626761 Method and apparatus for determining the flux vector of a rotating field machine  
For determining the flux vector, an EMF vector (e s ) is formed in an EMF detector (15) from the stator current and the stator voltage, the components of which are determined in a rotating...
4616179 Method of measuring torque of an AC motor  
A method is provided for measuring the torque of an AC motor (4) without a mechanical transducer by sensing input voltage, and input current regardless of phase, and determining the torque therefrom.
4609868 Circuit for detecting the failure of a step motor to respond to energization commands  
A circuit for detecting the failure of a step motor to respond to energization commands, which takes advantage of the time constant decrease of an energized phase which occurs due to stalling of...
4593820 Robotic, in-transit, device tester/sorter  
A testing mechanism is disclosed for incorporation with the gripping fingers of a robot arm, to enable the real time testing of a device under test after it is picked up by the grippers. The robot...
4577151 Spark monitor device for current collectors  
A spark monitor device arranged to detect a high frequency noise due to a spark generated in a current collector of a rotary electric machine and monitor a state of spark generation on the basis of...
4525763 Apparatus and method to protect motors and to protect motor life  
An apparatus for predicting the remaining useful life of a motor uses the temperature and past history of the motor to determine the amount of insulation degradation for its prediction. The...
4517839 Off-highway vehicle systems simulator and control panel testing  
An off-highway vehicle systems simulator and control panel testing apparatus produces electrical signals that simulate the electrical signals generated by detectors on the vehicle when it is...
4506218 Condition sensing arrangement for ac machines  
An arrangement for sensing the operating condition of an alternating current machine employs a Hall switch on the stator which is subjected to the alternating magnetic field established during...
4502005 Method and apparatus for determining the angle between the air-gap flux vector and the stator current vector of an asynchronous machine fed from an intermediate current-link frequency converter  
According to the method, current blocks of the stator currents are transformed into square waves of constant amplitude and the current blocks of the stator currents are extended to 180° el....
4500003 Axial lead tester/sorter  
A tester/sorter for performing electrical tests on axial lead devices such as diodes at a very high throughput rate carries the devices on the periphery of a rotating wheel. A contactor assembly...
4495448 Means and method of sensing motor rotation speed from stray escaping flux  
For isolating dynamic rotational signal components from a dominating line frequency component in the stray magnetic fields escaping from the motor, a pick-up probe for instrumentation analyzing the...
4489218 Device for protecting metal objects situated in the environment of an intense magnetic field developed by an alternator rotor without a stator  
The protection device comprises two half cages (13, 14) superposed on each other and surrounding the rotor (8) under test. The half cages together constitute a cage with openings between its bars...
4467279 Temperature compensated resistance test board  
A test board is provided for resistance testing of dynamoelectric machines, and in particular of the windings of an electric motor, in which a standard resistance value is adjusted automatically...
4459548 Alternator testing apparatus  
An alternator produces current that has an average component and a ripple component. The alternator testing apparatus produces one voltage representative of the magnitude of the peak-to-peak...
4451786 High sensitivity brush arcing monitor for a dynamoelectric machine  
High noise immunity instrumentation for monitoring brush arcing in a dynamoelectric machine is disclosed. In a preferred form the instrumentation includes a stabilized variable threshold...
4446426 On-line RF arc monitor for large rotating generators  
The level and duration of RF current flowing in the neutral grounding circuit of a generator is monitored to determine internal arcing conditions.
4445080 System for indirectly sensing flux in an induction motor  
Flux saturation in a current-excited induction motor is detected by sensing an accompanying increase in the level of the third harmonic in the waveform of the voltage across the stator windings....
4442393 Apparatus and method for determining the operation of an induction motor  
From the sensed input voltages and currents fed into a standard induction motor the stator resistance is known instantaneously through a direct and quadrature treatment of the sensed quantities...
4441065 Method and apparatus for determining the rotor resistance of an asynchronous machine  
Disclosed is a method to detect the rotor resistance of an asynchronous machine, wherein a first vector attached to the emf of the machine is determined by computing the emf-vector or the flux...
4441076 Motion detection apparatus for electric motors  
An apparatus for detecting and indicating the motion of electric motors includes a voltage sensing module which can be connected to the power terminals of any known type of electric motor and a...
4435659 Speed sensor for an electromagnetic machine  
A speed sensor (30) for an electromagnetic machine (31) such as a permanent magnet generator includes a magnetic core (44) mounted laterally outboard of the machine's stator teeth (36) and having...
4423367 Device for determining the parameter values for stator resistance, principal inductance and leakage inductance of an asynchronous machine  
Apparatus is disclosed wherein parameter values for the stator resistance, the main inductance and the stray inductance of an asynchronous machine is detected without using information about the...
4422040 Method of testing stepping motors  
A method for quickly testing stepping motors (10). The motor phases (ΦA-ΦC) are connected in series, and a constant current is applied to the phases. The rotor (12) of the motor (10) under test...
4419625 Determining asynchronous motor couple  
A device determines the mean power absorbed from a current supply by measuring the current in a phase, and the voltage between two phases, determining the product thereof, and integrating the...
4379990 Fault detection and diagnostic system for automotive battery charging systems  
An in situ self-diagnostic automotive alternator battery charging system is disclosed. Included are: a battery; voltage regulator sensing battery voltage and generating an excitation signal; and an...
4377784 Fault detection apparatus for rotor winding of rotary machine  
A fault detection apparatus for a rotor winding of a rotary machine comprises a peak value hold circuit, a peak value processor and a monitor. The peak value hold circuit holds peak value of a...
Matches 301 - 350 out of 505 < 1 2 3 4 5 6 7 8 9 10 11 >