Motor spark standard

Motor spark standard

Motor national standard GB755-87 provides the spark level as follows

Spark level brush under the degree of spark commutator and brush state

There is no black mark on the sparkless commutator and there is no burning mark on the brush

1-1 / 4 brush edge most of the sparks (about 1/5 to 1/4 brush only cut off a few points)

1-1 / 2 brush edge most of the (more than 1/2 brush edge) there are continuous dilute sphericity of the spark exchange boy Palace black mark, but not developed, with gasoline to wipe the surface that can disappear, Brush surface with a slight burning marks

2 brush all or most of the edge of a continuous, more dense particles spark, began to intermittent tongue-like spark commutator black mark, with gasoline can not be erased, while brush on the burning marks, such as short When the spark occurs, commutator does not appear burning marks, brush does not burn or damage

3 brush the entire edge of a strong tongue sparks, with the burst of the sound commutator black mark is more serious, with gasoline can not be erased, while brush on the burning marks. Such as running at this spark level for a short time, the commutator will appear at the same time the brush will be burnt or damaged

It can be seen, GB755-87 standard spark level is determined by two methods, one is the spark under the spark characteristics, that is, the spark size, brightness and intensity; Second, the spark on the commutator surface and brush The degree of damage. In the above spark level standard can be seen, 1 and 1-1 / 4 level is no harm to the spark, 1-1 / 2 spark although the commutator and brush surface to produce a slight burning marks, but still allow long-term operation , Will not cause a threat to the motor, 2 spark spark energy, will cause the commutator and brush burns, only allowed to appear when the overload, 3 spark is dangerous spark, it can lead to ring fire Accidents are not allowed to occur frequently.

For the permissible level of commutation sparks, the domestic factories and the use of the unit, usually provided as follows; from no load to the rated load, the exchange of sparks should not be greater than 1-1 / 2; in the maximum work overload, More than 2, this provision is actually considered 1-1 / 2 below the spark for the harmless spark, thus allowing the motor to run continuously for a long time, the second spark is harmful to the spark, only allowed to occur when the overload, Sparks are very dangerous, may lead to ring fire, do not allow often appear. When the tributary motor uses thyristor power supply, the commutation spark is usually larger than the battery or unit power supply, because the thyristor power supply motor spark contains AC components, with the eyes to observe the spark brightness, although the larger but in fact its arc energy is small.