How to Suppress Broadband Noise Generated by the Internal Motor Operation of an Infusion Pump?

The motor drive circuit is a strong noise source, and the broadband noise it generates can cause interference through spatial radiation and power line conduction. Suppression must address both the noise source and its propagation path. A high-current choke or ferrite bead must be connected in series at the motor power entry point to impede high-frequency noise currents. Simultaneously, good local shielding and grounding design should be implemented for the motor drive module to confine the electromagnetic field to the smallest possible area. The motor drive power lines and signal lines should be strictly separated in layout to avoid coupling. If necessary, ferrite cores can be used on the motor housing or connecting cables to further absorb radiated noise.