Research and experimental study of capacitance and inductance

suppressing electromagnetic disturbance of electric tools

 

JIN Yong, SUN Wei

(Zhejiang Institute of Quality Inspection Science, Hangzhou 310018, China)

 

Abstract: Aiming at the problem of electromagnetic disturbance of handheld electric tools,the disturbance source, influencing factors and suppression methods were summarized, the high frequency equivalent circuit and resonant frequency model of inductance and capacitance were established, based on the replacement of different types, different capacity of capacitance and inductance, with the test receiver, artificial power supply network and analog hands the disturbance voltage test was conducted on 150kHz~30MHz. The suppression effects of the different bands differential mode was analyzed, capacitors&inductors selection and installation recommendations were proposed. The results indicate that the suppression of handheld electric tools electromagnetic disturbance should pay full attention to high frequency characteristics of capacitance and inductance, the reasonable selection of capacity and type, shorten the lead, raise the resonant frequency so as to achieve the best suppression effect at low cost.

Key words: handheld electric tools; disturbance voltage; capacitance; inductance