AC series-excited motor radio interruption is one of the most serious motor. Source of interference is the spark of the commutation process. Commutation spark of high frequency electric energy, slightly lower frequency electric energy, often through a vacuum cleaner the power lead out, slightly higher frequencies, are radioactive. Electricity in these two ways of access to the grid. Interfere with the grid voltage and current. This interference appears on the TV screen a series of point-like signals, a splitting noise in the radio. With the popularity of household appliances, radio disturbances must suppress the vacuum cleaner:

1 changing the reverse situation, reduce sparking. If the brushes worn smooth, keep a good balance on the commutator contact. Can significantly reduce radio interference.

2, the use of stator winding of a symmetric method to suppress it. Two excitation winding on the stator there are two connections: one is the concatenation of stator winding and armature winding connection; the other is concatenation, respectively on the armature. Asymmetric connections of the former; symmetry of the latter method. These two laws do not affect motor performance, but for radio interference suppression are very different. Stator resistance to interference sources is a very large coils, in symmetric method, whether interference from a power line communications, were able to get a lot of inhibition. But in the asymmetrical method, interference can be spread from one end without winding the power cord. Above method for generating radio interference when addressing the vacuum cleaner, cleaners clean and fresh air in our warm family, thus maintaining the vacuum cleaner is essential in our family.