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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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3942111 |
Method and apparatus for testing electric motors
To determine whether a motor is operative, where visual inspection of rotation is impossible or difficult, the motor is energized by connection to an AC source for a short interval to bring the...
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3938041 |
Tape pack diameter measurement means and method
An unknown tape pack diameter is determined by measuring the inertia of the unknown tape pack and comparing the inertia with an inertia value representative of the inertia of a second tape pack of...
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3936744 |
Automotive alternator and solid state regulator tester
A tester for a solid state voltage regulator includes two parallel branches available for interconnection to the two output contacts of the voltage regulator. The two branches both interconnect to...
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3932811 |
Method and apparatus for testing windings or the like
Apparatus and method for testing windings, as for determining proper winding connections, by sensing the magnetic fields produced at the windings when energized by a time varying signal. Output...
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3898561 |
Tester for electrical devices
A tester for automobile-type solid state voltage regulators which provides normal and extreme operating condition tests, such as a low temperature-high current test, a high temperature and current...
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3898560 |
Apparatus for testing rotors of electric motors
Apparatus for testing rotors of electric motors in cyclic operation according to a predetermined program of events in which the rotor to be tested is clamped to the end of a shaft arranged to be...
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3896376 |
Circuit arrangement for testing insulation by partial discharge technique
Apparatus for testing the insulation of a commutator type armature winding and checking the resistance of the winding at points between pairs of commutator segments comprises an inductor-stator...
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3893029 |
Automobile alternator tester
A circuit for testing the operation of an alternator by comparing the DC output level and the AC output level at the battery terminal of the alternator. Only if the DC output is above a...
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3875511 |
Apparatus and method for testing dynamoelectric machine rotors
Method and apparatus for the nondestructive testing of the bars and end rings of a cast aluminum squirrel cage rotor. The rotor may be of the single cage or double cage type. The rotor is tested...
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3870954 |
Starter system fault detector
A starter system fault detector includes means for detecting the initial peak current waveform of a starter motor and related components under test. A reference peak of the waveform is provided by...
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3861025 |
METHOD FOR TESTING AND BALANCING DYNAMOELECTRIC MACHINE ROTOR END RINGS
Method and apparatus for the nondestructive testing of the bars and end rings of a cast aluminum squirrel cage rotor. The rotor may be of the single cage or double cage type. The rotor is tested...
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3855529 |
MEASURING ARRANGEMENT FOR DETERMINING THE AIR-GAP FLUX OF A ROTATING-FIELD MACHINE
A measuring arrangement for determining the air-gap flux of a rotating-field machine is disclosed. A measuring detector is placed in a recess formed in the inner surface of the laminated stator of...
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3846688 |
MACHINE WORK SENSOR
An improved work sensor circuit for single or multiphase electric motors wherein a change in work load produces a test voltage, thereby providing a convenient and sensitive way of measuring load...
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3793509 |
METHOD AND APPARATUS FOR COUNTING WORK CYCLES OF ELECTRICALLY DRIVEN DEVICES
An accurate count of the number of workpieces processed on an electrically driven machine tool is maintained by a counter controlled by a circuit which responds to the changes of drive motor...
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3772481 |
CONVEYORIZED ELECTRICAL CONTACT SYSTEMS
A conveyorized electrical contact system for electrifying work piece carriers traveling on first conveyor, the system providing for establishing as desired electrical contact with an electric rail...
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3758857 |
AUTOMATIC TESTING APPARATUS
An automatic electric motor testing facility provides a plurality of carriers for carrying motors to a plurality of testing stations at which tests are performed. A memory arm having two levels of...
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3728627 |
APPARATUS FOR SELECTING DIFFERENT GENERATOR OUTPUT RANGES IN ACCORDANCE WITH THE SPEED OF A MOTOR DRIVING THE GENERATOR
Apparatus comprising a plurality of voltage discriminator circuits selects different amplitude ranges of the electrical output of a generator in accordance with the rotational speed of the motor...
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3727133 |
DETECTION OF COMMUTATION DEFECTS
A signal is derived corresponding to variations in the unidirectional current flowing in the external power lines to a direct current rotating machine. A second signal is derived from the first...
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3727123 |
BRUSHLESS GENERATOR FIELD GROUND DETECTION SYSTEM
A ground detection apparatus for detecting and warning of a ground condition in the rotating field windings of rotating electrical machinery. A plurality of light emitting diodes mounted for...
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3705352 |
TESTING SYSTEM FOR MOTOR DRIVEN APPARATUS
A test system which replaces the traction motors of a transit car with an analog equivalent thereof operable at a much lower voltage rating than the motors. The system provides a similarly scaled...
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3662265 |
COMBINED MOTOR AND VOLTMETER
A voltmeter associated with a motor is operated by the magnetic field produced by the motor. A metal sensitizing element which is adjustable controls the sensitivity of the meter to the field.
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3657555 |
VARIABLE PASSIVE VOLTAGE TRANSIENT GENERATOR
A passive generator that provides for the precise and repeatable generation f voltage transients. A portion of the supply voltage, as determined by a potentiometer, is applied to a first and second...
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3651402 |
SUPERVISORY APPARATUS
1. The method of testing a hysteresis synchronous motor having a rotor and a pair of stator windings the first of which is energized directly from an alternating voltage source and the second of...
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3648040 |
CHAIN-CODE CORRELATOR
A chain-code correlator for determining the response of apparatus such as servomechanisms to command signals has a chain-code generator of m stages and clock-frequency f o connected through a...
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3639837 |
METHODS OF AND APPARATUS FOR TESTING ELECTROMAGNETIC INDICATORS
An electromagnetic indicator can be tested to determine whether or not it is properly positioned to the desired indicia. This is achieved by applying electrical signals to two stator windings of...
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3629704 |
AUTOMOTIVE ELECTRICAL SYSTEM TEST APPARATUS
An automobile alternator and voltage regulator test apparatus which may be connected to the electrical system of a car without altering the existing wiring. The test apparatus analyzes the waveform...
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3622882 |
REACTANCE CIRCUIT TESTER
Low-impedance circuits such as the armature windings of DC motors are tested for faults by equipment which delivers to them electric power surges having wave fronts with a rapid rate of change of...
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3601700 |
METHOD FOR TESTING A THREE WIRE DIFFERENTIAL SYNCHRO CHAIN
An aircraft stall warning system wherein flap and air vane controlled synchros phase shift an alternating current reference signal in response to lift air foil attitude to form a control signal...
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3594642 |
VEHICLE CHARGING, BATTERY, AND STARTING SYSTEM ANALYSIS METHOD AND APPARATUS
A method and apparatus for analyzing the charging, starting and battery systems of a vehicle by using an analyzer connected by three cables to the systems being analyzed. The apparatus includes a...
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3581205 |
APPARATUS FOR TESTING SWITCHING TYPE VOLTAGE REGULATORS BY COUNTING SQUARE WAVE PULSES PRODUCED BY THE REGULATOR
In the testing of a voltage regulator of the kind in which the regulator provides an output voltage of square wave form to a field winding, a signal is injected into the regulator representing the...
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3539923 |
TESTING APPARATUS FOR DETECTING SHORTS,LEAKAGE AND CONTINUITY IN WINDINGS
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3527954 |
SPARK MONITOR FOR DIRECT CURRENT MOTORS AND GENERATORS
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3483470 |
APPARATUS FOR TESTING ARMATURES FOR COIL CONDITION,SHORTS OR LEAKAGE
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3449673 |
TESTING SYSTEM FOR CHECKING DIODES CONNECTED IN SITU WITH INDUCTANCE WINDINGS OF DYNAMOELECTRIC MACHINES
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3434055 |
A.C. BRIDGE CIRCUIT FOR DETERMINING THE OPTIMUM OPERATING CONDITION OF A D.C. GENERATOR
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3395350 |
Method and apparatus for dynamic testing of resolvers
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3361969 |
Indexing fixture for testing the electrical error in rotating electrical components
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3359627 |
Method of balancing leakage reactance in resolvers
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3356935 |
Automotive electrical system tester and analyzer
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3333194 |
Meter to measure and print-out the ratio of a measured parameter to a calibrated standard value
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3328691 |
Method and apparatus employing a synchronously driven master generator for measurement of composite error in resolvers
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3312894 |
System for measuring a characteristic of an electrical pulse
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3307102 |
Armature test apparatus including a pair of transformers and means for combining the secondary voltages thereof
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3302897 |
Machine for single-step winding and calibration of electrical articles
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3293548 |
Means for testing apparatus which causes a rotatable shaft to follow the movements of another rotatable shaft
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3281672 |
Apparatus including an oscillator for detecting faults in coil windings and having means for comparing the frequency and amplitude of the oscillator output signal
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3270277 |
Means for selectively suppressing test voltages in motor component test equipment
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3267370 |
Magnetically shielded apparatus for indicating the number of turns and the presence of shorted turns in electric coils
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3241030 |
Warning signal circuit for an alternator
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