| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive rotor core which achieves sufficient high speed rotation while keeping a low iron loss and which is easily machined. SOLUTION: The rotor core (21) includes magnet mounting holes (22, 23) therein, and is made of a steel plate having a hardening property like a carbon steel or an alloy steel The rotor core is formed by laminating the steel plate obtained by hardening bridge parts (24, 25) around the magnet mounting holes (22, 23) and the vicinity (26, 27) of the bridge parts (24, 25). As a result, the inexpensive rotor core (21) which achieves sufficient high speed rotation and which is easily machined is provided. COPYRIGHT: (C)2011,JPO&INPIT |
