LIN Miao1, HUANG Yong fu1, HE Guang ping2

 

(1. Technique Centre of Fujian Entry exit Inspection & Quarantine Bureau, Fuzhou 350003, China;

 

2. Technique Centre of Xiamen Entry exit Inspection & Quarantine Bureau, Xiamen 361022, China)

 

 

Abstract: Aiming at the problem of disturbance power EMC test for household appliances with brush DC motor failing as a result of motor commutation, the spark existing during commutating was investigated. The limitation of electronic filter theory on reducing disturbance power and difficulty for establishing motor interference circuit model were pointed out. After considering disturbance power test failing on multiple occasions comprehensively, relevant adaptive strategies on reducing disturbance power were presented and analyzed. At last, the improvement on reducing the disturbance power for household appliances was verified after the practical test. The results indicate that it has a guidance on improving EMC characteristic and reducing electromagnetic interference of DC motor for R&D personnel after adopting these adaptive strategies.

 

Key words: brush DC motor; disturbance power; reducing methods; high frequency characteristic