To obtain a permanent magnet motor in which the lifetime of a rotor is enhanced while suppressing high frequency sound being generated by radial shaking force which is generated at the period of the number of poles of the rotor or due to deficiency of rigidity at the magnetic pole core section on the outer circumference of the rotor even when the rotor is set eccentrically.
The permanent magnet motor comprises a stator core having slots and pole teeth formed between the adjacent slots and a coil applied to the pole teeth, a rotor facing the stator through an air gap and having a permanent magnet arranged in the rotor core, a hole provided in the vicinity of the outer circumferential part in the rotor core and being inserted with the permanent magnet, and a plurality of slits provided in the radial direction in the magnetic pole of the rotor core on the outer circumferential side of the permanent magnet such that a part thereof is coupled with the magnet containing hole wherein flux density at the rotor core section between adjacent slits is set lower than flux density being generated by the magnetizing force 5,000 [A/m] of the DC magnetization characteristics of an electromagnetic steel plate.
COPYRIGHT: (C)2005,JPO&NCIPI
Yoshio Takita
Tomoaki Oikawa
Tajima Youga
| JP9131009A | ||||
| JP9163647A | ||||
| JP10285845A |