Method and apparatus for testing direct current motors and generators, electromagnetic devices, and the like
First Claim
1. Apparatus for testing electromagnetic devices such as D.C. motors, D.C. generators, and other electromagnetic devices comprising:
- means for producing a pulsating or otherwise time varying direct current output signal;
means for connecting the output signal to the device under test;
means for receiving a return signal from the device under test;
means for amplifying said return signal, producing an amplified signal; and
means for displaying the magnitude of said amplified signal;
wherein the means for producing said output signal comprises;
a constant voltage transformer;
means for connecting the constant voltage transformer to an electrical power supply;
a stepdown transformer connected in series with the constant voltage transformer;
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Abstract
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 varying direct current signal which is applied to the device or component under test. The signal induces a return signal in the device or component under test, or in a magnetic sensor placed in proximity to the device or component under test. The return signal is amplified and displayed on an amplifier output display. Novel methods are disclosed which utilize the apparatus to (1) determine and set the neutral plane in a D.C. motor or commutator type generator, (2) locate grounded, shorted, open or crossed coils or bars in an armature of a D.C. motor or a D.C. generator, (3) determine the relative magnetic polarity of the windings of various electromagnetic devices, and (4) detect shorted, grounded, or faulty field windings of various electromagnetic devices, including field coil windings in D.C. motors and generators.
43 Citations
12 Claims
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1. Apparatus for testing electromagnetic devices such as D.C. motors, D.C. generators, and other electromagnetic devices comprising:
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means for producing a pulsating or otherwise time varying direct current output signal; means for connecting the output signal to the device under test; means for receiving a return signal from the device under test; means for amplifying said return signal, producing an amplified signal; and means for displaying the magnitude of said amplified signal;
wherein the means for producing said output signal comprises;a constant voltage transformer; means for connecting the constant voltage transformer to an electrical power supply; a stepdown transformer connected in series with the constant voltage transformer; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification