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4369407 |
Regulator tester
Testing appartus and method for testing a regulator for switching current to an external load device in response to applied voltage, e.g., field current of an alternator. This tester is arranged to...
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4356443 |
Detection of arcing faults in polyphase electric machines
A method is provided for detecting the existence of arcing faults in the phase windings of a polyphase electric machine and for simultaneously identifying the specific phase winding in which the...
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4348629 |
Stator fault detector for automotive alternator battery charging systems
A detector monitoring the function of the stator and rectifying diodes in a multiphase alternator battery charging system is disclosed. A circuit combines individual phase signals from the...
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4345198 |
Generator air gap electrical torque monitor
Apparatus is disclosed for continuously monitoring the air gap torque acting on the rotor of a 3-phase electrical generator by sensing certain of the output voltages and currents produced by the...
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4344032 |
Method and arrangement for testing the characteristics of inductive pulse generators
A method and device for testing inductive pulse generators of the type used as wheel-rpm feedback transducers in anti-wheel-lock action in automotive braking systems. Within a portion of the range...
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4342960 |
Brush alignment apparatus
An apparatus is disclosed for aligning brushes of a dynamoelectric machine such as a dc generator or motor to minimize arcing of the brushes. The alignment monitor processes electrical signals from...
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4340847 |
Apparatus for supervising and controlling the output power of induction motors
An apparatus for supervising and/or controlling the output power of an induction motor comprising means for generating a first voltage signal (Ha) which varies with the actual speed of the motor,...
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4334189 |
Operation supervisory apparatus of canned motor
An operation supervisory apparatus of a canned motor comprising a first detection device for detecting mechanically abnormal operation and electrically abnormal operation of a canned motor a second...
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4330739 |
Method of determining operating parameters for a stepping motor
A stepping motor system is shown wherein a method is employed for determining the optimum amplitude of the current supplied to the stator winding of the motor. A series of different currents are...
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4303882 |
Method and apparatus for monitoring torsional vibration in the rotor of a dynamoelectric machine
Apparatus and method for monitoring torsional vibration in the rotor of a dynamoelectric machine by detecting electrical quantities available at the output terminals of the machine. For at least...
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4302712 |
Method of minimizing resonance in stepping motor and improved driver therefor
A stepping motor driver is adjusted to minimize resonance by adjusting a variable frequency source to adjust the fundamental frequency of the drive to the frequency of a filter, driving the driver...
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4281288 |
Apparatus for the measurement of the mechanical output of induction motors
Apparatus for measuring and/or supervising the output power of an induction motor comprising means for generating a first voltage signal proportional to the synchronous speed of the motor, means...
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4245181 |
Method and apparatus for generating an air gap flux signal for an AC machine from AC line voltage and current values
A substantially smooth, continuous and sinusoidal air gap flux signal for an AC machine is provided from machine terminal voltages and line currents. A voltage representative of the machine stator...
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4241484 |
Method for assembling a fuel pump and motor
A compact pump and motor assembly adapted for use as a fuel controller for an internal combustion engine fuel metering system. The assembly contains an electric motor, an interface housing assembly...
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4238733 |
Corona discharge monitor system
A corona discharge monitor system for a dynamoelectric machine, particularly for large salient pole generators, has an antenna mounted on a rotor pole. The antenna sweeps over the stator slots and...
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4230961 |
Magnetic flux sensor for laminated cores
A flux sensor is provided for measuring magnetic flux in laminated cores, and especially for measuring the axial flux in the end regions of the stator cores of large generators. The sensor...
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4229694 |
Power angle relay to measure and respond to the power angle of a synchronous generator
A power angle relay to measure the power angle of a synchronous alternator. The power angle relay receives a reference voltage signal corresponding to a fixed point on a reference voltage waveform...
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4224652 |
Method and apparatus for detecting ground shorts in the rotor circuit of a generator
A method, and apparatus for, protecting an object, and specifically detecting ground shorts in the rotor circuit of a generator, wherein for essentially completely detecting a ground short the...
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4222005 |
Testing device for generator output voltage regulators
There is disclosed a testing device for a voltage regulator incorporated in a generator assembly for controlling the output voltage of the generator assembly to a predetermined value, the generator...
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4211973 |
Apparatus for detecting faults to be occurred or initially existing in a running electric rotary machine
Apparatus for detecting possible changes or variations in the dimension of an air gap of a running electric rotary machine during operation thereof. Detector coils are each accommodated within...
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4204425 |
Method of testing induction motors
A method is provided for testing induction motors, particularly single-phase fractional horsepower motors, which enables routine testing of all motors in production for both starting and running...
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4204156 |
Apparatus for aligning brushes of a dynamoelectric machine
Apparatus is disclosed for aligning brushes of a dynamoelectric machine such as a DC generator or motor to minimize arcing of the brushes. The alignment monitor processes electrical signals from...
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4199718 |
Bearing wear detector for AC rotary electric instrument
A bearing wear detector for an AC rotary electric instrument such as an electric motor or a generator in which more than three detecting coils are mounted around a core of the electric instrument...
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4179744 |
Method and apparatus for analyzing performance of electric-traction-motor powered vehicles and electrical operating components thereof
Magnetic fields of electrical operating components of electric-traction-motor powered vehicles, especially diesel electric and all-electric railway locomotives, are sensed as the vehicles pass...
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4178546 |
Alternator test apparatus and method
An automobile alternator test apparatus tests for the presence of a failed diode by detecting a frequency component (a subharmonic component) in the alternator output ripple voltage produced by the...
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4164705 |
Brushless exciter fault indicator system
A brushless excitation system for a synchronous dynamoelectric machine includes an alternating current exciter and a rotating rectifier assembly. In such a system, the alternating current exciter...
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4156846 |
Detection of arcing faults in generator windings
A method is provided for detecting the presence of arcing faults in the stator windings of large dynamoelectric machines, such as turbine generators. Arcing faults, such as broken strands in a...
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4156188 |
Method and apparatus for testing the magnetic properties of rotors for hysteresis motors
A method and apparatus test the characteristics of rotors for hysteresis motors. A rotor to be tested is placed in predetermined spaced relation adjacent a testing stator having a stator winding....
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4145653 |
Waveform analyzer for rotating electrical circuitry
Two monitor circuits, each having a light emitting diode, are connected to the inputs and outputs of an SCR current control circuit on a brushless a-c generator. The current control circuit and the...
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4140965 |
Isolation voltage test apparatus
Disclosed is an apparatus for providing non-destructive isolation voltage testing of circuit elements which includes a controllable full wave rectifier in series with the primary winding of a high...
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4140933 |
Arrangement for slipring-free measurement of rotor current of an electrical machine
Measurement of the current flowing in the rotor of an electrical machine and especially an a.c. exciter with external poles for excitation of a synchronous machine by way of a rectifier mounted on...
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4138642 |
Method and arrangement for indirectly ascertaining the rotary speed of a permanent-magnet-stator D.C. motor
A D.C. motor comprises a permanent-magnet stator including a flux-return structure and at least one permanent-magnet stator magnet mounted on the flux-return structure and also an armature mounted...
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4136312 |
Method and apparatus for detection of rotor faults in dynamoelectric machines
A method and apparatus are provided for detecting rotor faults in large dynamoelectric machines, such as turbine generators. Faults in the rotor windings of such machines may occur as shorted turns...
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4123009 |
Load sensor for a grinding mill
A method and apparatus for detecting predetermined operating conditions of a machine driven by an electric motor, in which a filtered electric signal is utilized. The filter is designed to signal...
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4091662 |
Apparatus for testing the performance of electric motors
Apparatus for testing the performance of electrical machines by producing a direct digital readout and display of per unit rotor slip in electrical motors from no load condition through loads in...
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4086531 |
Electrical system test apparatus
An alternator-battery electrical system test apparatus which, in one modification, includes a four stage voltage level sensing system, each stage being operative in response to a particular...
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4083001 |
Measurement of motor winding temperature
The temperature of a motor winding is measured or monitored by measuring the resistance of the winding. This is done by introducing a small direct current component into the motor current, which...
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4070624 |
Apparatus for testing starters and alternators
Test apparatus for electrically and mechanically testing the condition of alternators and starters used in automobiles, trucks and the like. The apparatus, in its preferred form, includes a pair of...
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4053830 |
Armature winding termination continuity tester and method
Apparatus and method are disclosed for testing winding terminations and more particularly for testing armature winding termination continuity. A nonrotating, simultaneous test is made of the...
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4019120 |
Fault indicator for motor vehicle battery charging systems
A fault indicator for a motor vehicle battery charging system of the type in which a diode-rectified alternating current generator supplies charging current to the vehicle battery and supplies...
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4001689 |
Device for indicating the direction of rotation of a body driven by a rotating electrical machine
A device for indicating the direction of rotation of a rotating body forming part of or associated with rotating electrical machine comprises the combination of a probe unit positioned to interrupt...
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4000464 |
Arrangement for detecting ground leaks in the rotor circuit of a brushless synchronous machine excited by rotating rectifiers
The invention is directed to an arrangement for detecting ground leaks and includes two identical synchronous machines coupled to the rotor of a brushlessly excited synchronous machine. One of the...
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3999127 |
Apparatus and method for automatically testing the generator and regulator of a motor vehicle
An automatic generator and regulator tester and method thereof. With the apparatus and method described herein, various performance characteristics of the generator and regulator are determined for...
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3996480 |
Sample and hold-circuit arrangement for an electrical motor simulator of an electronic motor protection relay
A sample and hold-circuit arrangement for an electrical motor simulator of an electronic motor protection relay wherein the motor simulator is charged by a charging current source with clocked...
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3988049 |
Apparatus for high speed rotation of electrically operated devices
Most high speed centrifuges employ a relatively small diameter elongate flexible drive shaft, sometimes called a "quill" shaft. These relatively slender shafts are flexible to absorb vibration as...
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3980950 |
Method of determining the displacement angle of an electric motor and means for effecting same
The method of the present invention consists in passing a pulsating current through two series-connected working phase windings of the stator of an electric motor and determining the relationship...
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3973190 |
Infralow frequency transfer function analyzer
An infralow frequency controlled-member transfer function analyzer comprises an electromechanical infralow frequency generator, a rotary transformer mechanically coupled to the output shaft of the...
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3962618 |
Digital following error measurement system
A following error measurement system for phase analog servo systems is disclosed. The leading or lagging status of a phase analog servo system's command signal with respect to its feedback signal,...
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3947764 |
Method and apparatus for testing DC motors
Method and apparatus for testing DC motors, particularly permanent magnet DC motors, involving application of a constant voltage across the motor terminals and at an earlier or later time causing a...
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3943504 |
Electric motor direction indicating device
A direction indicating device for indicating the direction of rotation of a polyphase A.C. electric motor. A polyphase energy source having a frequency higher than the operating frequency of the...
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