Method and apparatus for motor size determination
First Claim
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1. A method of testing motors of the type having separate start and run windings to verify motor size and detect miswired motors comprising the steps of:
- (a) measuring the start winding resistance;
(b) measuring the run winding resistance;
(c) calculating a ratio of the start winding resistance and the run winding resistance;
(d) comparing the calculated ratio to a predetermined ratio range representative of the desired motor size; and
(e) rejecting the motor if the calculated ratio is outside this predetermined range.
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Abstract
A method for testing motors having separate run and start windings to verify correct motor size and to detect miswiring of the motor windings comprises the steps of measuring the start winding resistance, measuring the run winding resistance, calculating a ratio of the start winding and run winding resistances and comparing the calculated ratio to a predetermined range representative of the desired motor size when correctly wired and rejecting the motor if the calculated ratio does not come within this predetermined range, and apparatus for same.
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Citations
11 Claims
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1. A method of testing motors of the type having separate start and run windings to verify motor size and detect miswired motors comprising the steps of:
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(a) measuring the start winding resistance; (b) measuring the run winding resistance; (c) calculating a ratio of the start winding resistance and the run winding resistance; (d) comparing the calculated ratio to a predetermined ratio range representative of the desired motor size; and (e) rejecting the motor if the calculated ratio is outside this predetermined range. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for testing motors of the type having a separate start winding and run winding to verify motor size and detect miswiring of motor windings comprising:
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means for determining the resistance of the start and run windings; means for calculating a ratio of start winding resistance and run winding resistance; means for comparing said calculated ratio to a predetermined range of acceptable ratio values representative of the desired motor size when properly wired; and means responsive to said comparing means for generating a reject signal if said calculated ratio is outside said predetermined range of acceptable values. - View Dependent Claims (7, 8, 9, 10)
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11. Apparatus for automatically testing motors of the type having a separate start and run winding to verify motor size and detect miswiring of the motor windings comprising:
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a constant current source; first and second switch means for connecting the start and run windings respectively to said constant current source; controller means operative to selectively switch said first and second switch means into conduction to separately energize the start and run windings; said controller means including means for measuring the respective voltages across the start winding when energized and the run winding when energized;
means for calculating the ratio of the start winding voltage to the run winding voltage corresponding to the ratio of run winding resistance to start winding resistance;
means for comparing said calculated ratio to a predetermined range of acceptable ratio values representative of the desired motor size when properly wired; andmeans responsive to said comparing means for generating a reject signal if the calculated ratio is outside said predetermined range of acceptable values.
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Specification