| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor that reduces the thickness of magnets (the amount of use of magnets) while ensuring demagnetization resistance and torque characteristics, and is applicable to an electric power steering system, etc. <P>SOLUTION: The permanent magnet synchronous motor includes a rotor 22 which has a plurality of permanent magnets 25 arranged on the outer periphery of a rotor core 23 and is supported to be able to rotate freely, and a stator 12 which is disposed outside the rotor 22 and has stator coils 5 and a stator core 3. When the length of an airspace between the outer periphery of the permanent magnet 25 and the stator core 3 is L [mm] and the thickness of the central portion 29 of the permanent magnet 25 in the direction of rotation of the motor is t [mm], the airspace length L and the thickness t are determined to be within a range of L≤1 [mm] and t/(t+L)≤0.9. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
