To reduce the cost of a permanent magnet motor and to increase its efficiency.
This is a three-phase four-pole permanent magnet motor composed by arranging a rotor 11 which has a coil 10b wound in each tooth 10a of a six-slot construction by concentrated winding inside a stator 10, and generates rotating magnetic fields. In this rotor 11, a first permanent magnet to a third permanent magnet 12, 13, 14 are buried to form poles along both oblique sides and the upper side of a trapezoid, and these first to third magnets 12, 13, 14 are buried with equal intervals by a number necessary for four poles in the circumferential direction to form a field system. The first and second magnets 12, 13 has rectangular sections, and are arranged with their long sides parallel to the q-axis. The third magnet 14 has a rectangular section, and is arranged with its short side towards the shaft 3 side end parts of the first and second magnets 12, 13. The first and second magnets 12, 13 of ferrite and the third magnet 14 a rare earth magnet are magnetized in the directions rectangular to the long sides of the rectangular sections, to make adjoining magnetic polarities different from each other.
NARITA KENJI
FUKUDA YOSHIFUMI
TSUKAMOTO SATOSHI
| JPH11243653A | 1999-09-07 | |||
| JPH11136912A | 1999-05-21 | |||
| JPH11113199A | 1999-04-23 | |||
| JPH11285185A | 1999-10-15 |
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