Troubleshooting of common faults in medical centrifuges (l) After power-on, the motor does not turn: first check the power cord, plug, and socket. If it is damaged, it should be replaced. If there is no problem, check whether the band switch or varistor is damaged or disconnected. . If damaged or opened, replace the damaged component and re-weld the wire. If there is no problem, check whether the motor field coil is broken or open (internal). If the coil is broken, it can be re-welded. If the coil is internally broken, it can only rewind the coil.
(2) The motor speed does not reach the rated speed: first check the bearing, if the bearing is damaged, replace the bearing. If the bearing is short of oil or too much dirt, the bearing should be cleaned and greased. Check whether the surface of the commutator is abnormal or whether the matching of the brush and the surface of the commutator is consistent. For example, if there is an abnormality on the surface of the commutator, if there is a layer of oxide, it should be sanded with fine sandpaper. If the matching between the commutator and the brush does not match, the contact should be adjusted to a good condition. If there is no such problem, check whether there is a short circuit in the rotor coil. If there is any, rewind the coil.
(3) Vibrate and loud noise: Check if there is any imbalance, and the nut of the fixed machine is loose. If it is, tighten it. Inspect the bearing for damage or bending. Replace the bearing if available. The machine cover is deformed or the position is incorrect. If so, adjust it.
(4) The low speed gear cannot be started when it is cold: the lubricating oil solidifies or the lubricating oil deteriorates and sticks. At the beginning, you can use your hand to help re-apply after re-rotating or cleaning.
(5) The gap between the commutator and the brush is too large: check whether the surface of the commutator is flat. If the surface is not flat, it can be sanded. If the problem is that the brush and the commutator are in poor contact. If the contact is poor, sand the surface with fine sandpaper and re-adjust the fit between the brush and the commutator. The quality of the brush is unqualified. If this is the fault, only the brush can be replaced. If there is no problem above, check whether the field coil has a partial short circuit or ground or the rotor coil has a partial short circuit or open circuit. If any of the above occurs, it must rewind the magnetic field coil or rewind the rotor coil.
(2) The motor speed does not reach the rated speed: first check the bearing, if the bearing is damaged, replace the bearing. If the bearing is short of oil or too much dirt, the bearing should be cleaned and greased. Check whether the surface of the commutator is abnormal or whether the matching of the brush and the surface of the commutator is consistent. For example, if there is an abnormality on the surface of the commutator, if there is a layer of oxide, it should be sanded with fine sandpaper. If the matching between the commutator and the brush does not match, the contact should be adjusted to a good condition. If there is no such problem, check whether there is a short circuit in the rotor coil. If there is any, rewind the coil.
(3) Vibrate and loud noise: Check if there is any imbalance, and the nut of the fixed machine is loose. If it is, tighten it. Inspect the bearing for damage or bending. Replace the bearing if available. The machine cover is deformed or the position is incorrect. If so, adjust it.
(4) The low speed gear cannot be started when it is cold: the lubricating oil solidifies or the lubricating oil deteriorates and sticks. At the beginning, you can use your hand to help re-apply after re-rotating or cleaning.
(5) The gap between the commutator and the brush is too large: check whether the surface of the commutator is flat. If the surface is not flat, it can be sanded. If the problem is that the brush and the commutator are in poor contact. If the contact is poor, sand the surface with fine sandpaper and re-adjust the fit between the brush and the commutator. The quality of the brush is unqualified. If this is the fault, only the brush can be replaced. If there is no problem above, check whether the field coil has a partial short circuit or ground or the rotor coil has a partial short circuit or open circuit. If any of the above occurs, it must rewind the magnetic field coil or rewind the rotor coil.
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