| 摘要 |
A rotor (20) has a four-pole permanent magnet (31A) embedded in a rotor layered core. A gap (31G) is also arranged together with the permanent magnet between an inner circumferential layered core and an outer circumferential layered core. A permanent magnet of one pole is formed by two permanent magnets (31A and 31B) arranged so as to sandwich a gap (31G). When Tm is the thickness of the permanent magnet in the inter-pole direction, the air gap thickness in the d-axis direction is set to [½×Tm] or below.
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