Fan wheels can be operated with various AC motors as well as EC motors at mains voltages of 50 Hz or 60 Hz. There are various options for mounting the fan wheel on the motor. Various hub shapes can be used, or the fan wheel can be mounted directly on the motor flange. The motors are selected on the basis of the power requirement at the shaft of the fan, added with a power reserve and the mass moment of inertia.
In the following chapters, various standard variables, motor parameters and their control are discussed.