Editing Electromagnetic interference
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===Capacitive coupling in motor control=== | ===Capacitive coupling in motor control=== | ||
In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal. | In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal. | ||
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The most effective methods of suppressing this noise are: | The most effective methods of suppressing this noise are: | ||
*Use shielded conductor and tie cable shield to stable voltage potential such as earth. Cable shield provides Faraday's cage that attenuates the radiating electric field of internal conductors. | *Use shielded conductor and tie cable shield to stable voltage potential such as earth. Cable shield provides Faraday's cage that attenuates the radiating electric field of internal conductors. | ||
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See more at: http://www.electrical-installation.org/enwiki/Capacitive_coupling | See more at: http://www.electrical-installation.org/enwiki/Capacitive_coupling | ||
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