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June 2015
DocID027840 Rev 1
1/51
www.st.com
AN4694
EMC design guides for motor control applications
Alessio Corsaro, Carmelo Parisi and Craig Rotay
Introduction
In recent years, continuous demand for efficient, compact and low cost applications in the motor control
industry has led to a boom in inverter-based solutions driven by MCUs. These applications involve high
switching frequencies and high power levels and must function compatibly with severe electromagnetic
environments (EMC). The implementation of transient immunity protections (EMS) to prevent appliance
malfunction and the design of countermeasures to limit application emissions (EMI) is therefore a
becoming a growing concern for appliance designers.
Best practices regarding EMC control through PCB layout, circuit design and component selection can
greatly improve EMC performance, especially when they are an integral part of the entire design cycle.
This application note discusses the effects of EMC on motor control applications and suggests some
practical hardware guidelines to provide cost-effective protection against electrical fast transients (EFT),
electrostatic discharge (ESD) and to limit the conducted and radiated emissions (EMI) in appliance
applications.
