Electric miniature drives are now present in a wide range of applications. In addition to
classic mains-operated kitchen appliances a wide variety of battery-operated devices with
built-in electric motors are used in a domestic setting from robotic vacuum cleaners through
motor-operated heating valves to milk frothers. Electric miniature drives are somewhat less
visible in daily use in optical devices in laboratory automation or in special machinery
construction. For electronics developers the challenge is to keep an eye on the components of
the power electronics microcontroller and sensor technology that come together in the
controlled electrical drive in a very small space from the point of view of Electromagnetic
Compatibility (EMC) and to find marketable compromises. First the book gives a brief overview
of the development of the EMC topic and the current general boundary conditions for bringing
electric drives onto the market. After this the effects coupling paths and test methods for
both the emitted interference and the interference immunity are presented. The sources of the
different disturbances originating from a motor controller are named and linked to their
effects. On this basis the common EMC measures are then discussed step by step and their
effectiveness verified by means of the measurement result. This book is therefore aimed at
users and supports them in setting up their end device in an EMC-compliant manner with a
controlled miniature drive as a component. In addition electronics developers learn the
necessary basic measures to take EMC into account already in the development of motor
controllers for miniature drives. If this is taken into account such development projects can
be successfully realised in an EMC-safe manner. About the content: . Challenge of EMC:
Interference sources in electric drives frequency components from radio interference
suppression to EMC . CE certification: EU directives for the operation of electric miniature
drives . Interference emissions of devices: Conducted interference coupling paths for
electromagnetic interference measurement methods and typical measurement results .
Interference signals in controlled devices: Interference behaviour of a DC DC converter
interference behaviour of a motor controller . Limiting interference emissions: Propagation
paths grounding and shielding cable routing filter and test results . Interference immunity
of devices: Acceptance criteria effects measures . EMC measures for miniature drives:
Integrated motor controllers externally mounted motor controller encoders . Additional
measures to increase robustness: Coding complementary signals (linedrivers) robustness of
different interfaces
