Armature ground locating test process and equipment
First Claim
1. A method for locating ground faults in motor armatures comprising the steps of:
- a. shorting a commutator of a motor armature;
b. connecting an AC power supply between the commutator and a core of the motor armature;
c. increasing a magnitude of a voltage applied by the AC power supply to the commutator until current flows through a winding grounded point on the motor armature;
d. moving a probe of a gauss meter along an edge of the core adjacent the commutator to locate a core slot having a highest magnetic field reading measured by the gauss meter; and
e. moving the probe along the core slot with the highest reading until the gauss meter measures a sudden reduction in the magnetic field indicating the grounded point.
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Accused Products
Abstract
A process and an apparatus for locating ground faults in motor armatures includes shorting a commutator of a motor armature with a shorting strap and connecting a variable voltage AC power supply and a load in series between the commutator and a core of the motor armature. The magnitude of a voltage applied by the AC power supply to the commutator is increased until current flows through a winding grounded point on the motor armature. Then a probe of a gauss meter is moved along an edge of the core adjacent the commutator to locate a core slot having a highest magnetic field reading measured by the gauss meter. The probe is moved along the core slot with the highest reading until the gauss meter measures a sudden reduction in the magnetic field indicating the grounded point.
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Citations
13 Claims
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1. A method for locating ground faults in motor armatures comprising the steps of:
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a. shorting a commutator of a motor armature;
b. connecting an AC power supply between the commutator and a core of the motor armature;
c. increasing a magnitude of a voltage applied by the AC power supply to the commutator until current flows through a winding grounded point on the motor armature;
d. moving a probe of a gauss meter along an edge of the core adjacent the commutator to locate a core slot having a highest magnetic field reading measured by the gauss meter; and
e. moving the probe along the core slot with the highest reading until the gauss meter measures a sudden reduction in the magnetic field indicating the grounded point. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for locating a ground fault in a motor armature comprising:
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a shorting strap;
a variable voltage AC power supply; and
a gauss meter having a probe whereby when said shorting strap is applied around a commutator of a motor armature, said AC power supply is connected between the commutator and a core of the motor armature to cause current to flow through a winding grounded point on the motor armature, and said probe is moved along an edge of the core adjacent the commutator to locate a slot having a highest magnetic field reading, said probe can be moved along the slot with the highest magnetic field reading until a sudden reduction in the magnetic field reading indicates the winding grounded point. - View Dependent Claims (8)
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9. A method for locating ground faults in motor armatures comprising the steps of:
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a. shorting a commutator of a motor armature;
b. connecting a variable voltage AC power supply and a load in series between the commutator and a core of the motor armature;
c. increasing a magnitude of a voltage applied by the AC power supply to the commutator until current flows through a winding grounded point on the motor armature;
d. moving a probe of a gauss meter along an edge of the core adjacent the commutator to locate a core slot having a highest magnetic field reading measured by the gauss meter; and
e. moving the probe along the core slot with the highest reading until the gauss meter measures a sudden reduction in the magnetic field indicating the grounded point. - View Dependent Claims (10, 11, 12, 13)
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Specification