Motor, method for manufacturing rotor, and electric power steering apparatus

摘要

A motor is provided with a rotor of which an inner portion made from a material having a lower density than an outer portion is fitted inside the outer portion around whose outer surface magnets are fixed; wherein the inner portion is shrink fitted or pressure fitted inside the outer portion. The rotor is manufactured by a simple process without the need to keep the rotor at high temperature for a set period of time as in the case of sinter bonding. A plurality of cut out holes is formed in the inner portion to make the rotor more lightweight.