What is the reason for too much spark in the commutator of new energy vehicles?

 What is the reason for too much spark in the commutator of new energy vehicles? Too large a spark in the commutator of a new energy vehicle may be caused by a variety of factors such as electromagnetic, mechanical, operating environment and brush-related factors.

If the synthetic potential within the commutator element is not equal to zero, additional commutation current will be generated in the commutator element, resulting in uneven distribution of current density between the front and rear brush edges of the brushes. When the brushes contact or disengage from the commutator sheet, there will be a high contact potential difference, which in turn generates sparks.

The armature generates magnetic flux when current is passed through it, which affects the main flux of the motor and produces a demagnetising or demagnetising effect, i.e. armature reaction. The larger the load, the stronger the magnetic field distortion caused by the armature reaction, which will destroy the normal commutation of the armature winding elements and easily cause sparks.

Poor working condition of commutator surface, such as commutator protruding piece or deformation, protruding mica piece between pieces, commutator surface roughness, etc., will cause the brush and commutator can’t keep stable sliding contact between them, thus generating sparks.

Motor vibration is also a factor causing unstable sliding contact. When the commutation spark is large, it is usually necessary to use a vibration meter to check the vibration value of the motor bearings, seat and brush holder to see if it exceeds the permissible value.

When the ambient temperature is too high or too low, and the humidity is too high or too low, it will lead to the destruction of the balance of the oxide film, and it will not be able to form the normal oxide film and affect the normal sliding contact, thus generating sparks.


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