The video suggests that to change brushes on some electric motors, you spread apart the brush holders on either side of the motor until they pop open, exposing the brushes.
While that's a very brief glimpse, changing brushes on an electric motor generally involves these steps (Note: Always disconnect the power source before working on any electrical equipment.):
- Locate the Brush Holders: Brushes are typically housed in brush holders located on the motor's commutator end. They are often cylindrical or rectangular and might be covered.
- Access the Brushes: The method of accessing the brushes varies depending on the motor type.
- Pop-off covers: As seen in the provided snippet, some motors have covers that can be carefully pried or spread apart to access the brushes.
- Screw-on caps: Other motors have screw-on caps that need to be unscrewed to release the brush.
- Retaining Clips: Some use clips to hold the brush in place.
- Remove the Old Brushes: Once the brush holder is open, carefully remove the old brushes. Note their orientation, as the new brushes need to be installed the same way.
- Inspect the Commutator: While the brushes are out, inspect the commutator (the part the brushes contact) for wear, damage, or debris. Clean the commutator with a commutator cleaning stone or very fine sandpaper if needed.
- Install the New Brushes: Insert the new brushes into the brush holders, ensuring they are seated correctly and make good contact with the commutator. Ensure they are oriented correctly - often, they will be slightly curved to match the commutator.
- Secure the Brush Holders: Close the brush holders, whether by snapping the cover back on, screwing the cap back in place, or reattaching the retaining clip.
- Run the Motor: After replacing the brushes, run the motor briefly to allow the new brushes to seat themselves against the commutator. It's normal to see some sparking initially as the brushes wear in.
Important Considerations:
- Brush Type: Use the correct type of replacement brushes for your motor. Check the motor's specifications or consult the manufacturer.
- Spring Tension: Some brush holders have springs that provide pressure on the brushes. Make sure the springs are functioning correctly. If the springs are too weak, the brushes won't make good contact with the commutator.
- Safety: Disconnect the power before attempting any motor maintenance.
