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| Rotating Electrical Machines |
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| Quality Plan |
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| Quality Plan |
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| Quality requirements are governed
by Quality Plan for L.T./H.T. Motors.
The Quality Plan covers the following
important aspects : |
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| Inspection of Incoming materials |
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| Vendor approval for supply of raw
materials, components and fabricated
parts to meet the required quality standards,
is collectively undertaken by manufacturing,
purchase, R & D and Quality Assurance
divisions. |
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| All incoming materials are inspected
as per specifications. Various tests
like Dimensional check, surface condition,
chemical analysis, mechanical tests,
electrical tests, non-destructive tests
such as ultrasonic examination, magnetic
particle examination, dye penetration
test, radiographic test etc. are conducted
on material as per appropriate standards. |
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| In-Process Inspection |
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| All components processed in various
shops are inspected as per requirements
of the drawings. Following checks are
carried out on stator coils made using
resin rich system : |
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Dimensional conformance. |
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High frequency inter-turn test
at appropriate voltage level. |
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Power frequency high voltage
test. |
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Tandelta test as per VDE-0530. |
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| Testing of Final Product |
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| Following routine tests are
conducted on each motor : |
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Insulation Resistance
measurements for stator and rotor
winding. |
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Winding resistance measurement
of stator and rotor windings. |
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PI test on stator winding (for
HT Motors). |
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No load test. |
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Locked rotor test (for squirrel
cage motors). |
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Open circuit test (for wound
rotor motor). |
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Reduced voltage running up test
(for squirrel cage motors). |
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High voltage test. |
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Vibration measurement. |
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Noise level measurement. |
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Load and temperature rise test. |
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