Armature winding termination continuity tester and method
First Claim
1. Apparatus for testing armature winding termination continuity of an armature having a circular array of commutator bars and a plurality of armature windings each having its opposite ends terminated to a different one of said bars so as to define a plurality of sets of bar-to-bar winding terminations, comprising:
- means for simultaneously applying test currents of equal value to flow through each said set of bar-to-bar winding terminations to develop respective bar-to-bar voltages;
means for simultaneously measuring voltage differences between the voltages developed across different selected pairs of all of said sets of bar-to-bar winding terminations;
means for simultaneously determining whether any of said voltage differences exceeds a reference limit; and
,means for providing an output indication dependent upon said determination.
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Accused Products
Abstract
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 armature winding terminations to commutator bars by simultaneously applying equal currents to different sets of bar-to-bar winding terminations. The differences in the bar-to-bar voltages of selected pairs of bar-to-bar terminations are obtained and a determination is made as to whether any voltage difference exceeds a reference limit. If not, then an acceptable continuity test indication is given.
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Citations
13 Claims
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1. Apparatus for testing armature winding termination continuity of an armature having a circular array of commutator bars and a plurality of armature windings each having its opposite ends terminated to a different one of said bars so as to define a plurality of sets of bar-to-bar winding terminations, comprising:
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means for simultaneously applying test currents of equal value to flow through each said set of bar-to-bar winding terminations to develop respective bar-to-bar voltages; means for simultaneously measuring voltage differences between the voltages developed across different selected pairs of all of said sets of bar-to-bar winding terminations; means for simultaneously determining whether any of said voltage differences exceeds a reference limit; and
,means for providing an output indication dependent upon said determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for testing armature winding termination continuity of an armature having a circular array of commutator bars and a plurality of armature windings each having its opposite ends terminated to a different one of said bars so as to define a plurality of sets of bar-to-bar winding terminations, comprising the steps of:
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simultaneously applying test currents of equal values to flow through each of said sets so as to develop respective bar-to-bar voltages; simultaneously measuring the voltage differences between the voltages developed across different selected pairs of all of said sets; simultaneously determining whether any of said voltage differences exceeds a reference limit; and
,providing an output indication dependent upon said determination.
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12. Apparatus for testing armature winding termination continuity of an armature having a plurality of armature windings each having its opposite ends terminated to respective different commutator bars so as to define a plurality of bar-to-bar winding terminations in a circular array of said commutator bars and comprising:
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a plurality of N impedence networks of equal values, wherein N is an even number and the number of said windings is at least equal to N; a plurality of at least N electrical test probes for simultaneously electrically contacting a respective different one of said commutator bars; means for connecting alternate ones of said test probes through a respective one of said impedence networks to one side of a power source; means for connecting the intermediate ones of said test probes through a respective one of said impedence networks to a second side of a said power source; means for simultaneously electrically measuring the voltage differences between selected different pairs of said bar-to-bar winding terminations; means for simultaneously comparing each of said voltage differences with a reference limit to determine if any of said voltage differences exceeds said reference limit; and
,means for providing an output indication dependent upon said determination. - View Dependent Claims (13)
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Specification