![Drive direct current motor](/images/new-backgrounds/54650/54650117x1.webp)
USER MANUAL
Drive direct current motor
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Maintenance |
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Commutator | Ensure that the surface along which the carbon |
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| brushes slide is covered with an even, shiny, |
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| transparent light grey film. |
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| Check that there are no black marks or burns |
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| between the commutator segments and on the |
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| commutator outer crown. |
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| Ensure that the commutator surface is not lined, |
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| deeply grooved or burnt on the segment in or out |
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| edges. |
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| Check that the brooms have not grooved the |
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| commutator surface and that the insulating mica |
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| does not protrude from the copper segment. |
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| Check that the commutator is clean and that there |
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| are no burns on the segments; if necessary, clean |
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| the commutator as described. |
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| Check eccentricity. |
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| Clean the commutator with special rubber sticks. If |
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| necessary, clean between the segments. |
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Carbon | Check the carbon brush for wear. It is worn out |
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brushes | when more than half of its total length has been |
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| consumed. Check that it slides freely in the brush |
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| holder, that it is pressed correctly by the spring and |
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| that the spring is still elastic. |
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| Ensure that the surface along which the carbon |
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| brushes slide is evenly and highly polished and |
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| that any lines or porosity are extremely small and |
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| of similar dimensions. |
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| Check the wire for wear and ensure that the |
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| connection terminals are well tightened. |
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| Ensure that there are no big lines, deep grooves, |
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| craters, burns or splinters on the carbon brush |
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| edge and that all the carbon brushes are worn in |
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| the same way. |
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| Check the housing for wear and clearance. |
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| Brushes usually last from 6 months to 1 year, |
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| depending on use. |
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| Check the carbon brush and coupling pressure. |
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| When the warning light turns on, the carbon |
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| brushes need to be replaced, even if 300 hours |
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| have not been reached. |
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Terminals | Check that supply bolt nuts are well tightened and |
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| that the insulating materials are in good condition. |
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Fan | Ensure that air intakes are not clogged and that the |
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| fan turns freely. |
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Bearings | Check the temperature and the vibration and noise |
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| degree. |
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Insulation | Use a megger, especially when the environment is |
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| wet, to check the insulation value: it should never |
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| be less than 2 MOhm. |
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Screws | Check that the screws are not loose. |
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| Check that there are no faulty contacts in the |
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| electrical connections which could lead to local |
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| overheating. |
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Windings | General cleaning. Check that the insulation to |
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| ground is less than 2 MOhm. |
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15 |