| 摘要 |
<p>A motor comprising a rotor core (12) in which multiple concave permanent magnets (13,14) forming magnetic poles are embedded, wherein an edge section of each permanent magnet (13,14) directed towards the periphery of the rotor elongates radially from a position between the magnetic poles to the vicinity of the rotor periphery, each of the permanent magnets (13,14) is divided into two layers (13,14) a first radially inner layer (13) and a second radially out layer (14), said edge section is formed on each circumferential side of each of said layers (13,14) and is delimited in the circumferential direction by two border points, a first border point being closer to a magnetic pole centre and a second border point being closer to a middle point between two adjacent magnetic poles, angles θ3 and θ4 are defined, in a plane perpendicular to the rotor axis, by a first and a second radii departing from the rotor centre and intersecting the rotor periphery, said angles θ3 and θ4 are determined to be
0 < θ3 < 180/(5 Pn) and 180/(5 Pn) < θ4 < 180x2/(5 Pn)
or 0 < θ3 < 180/(7 Pn) and 180/(7 Pn) ≤ θ4 ≤ 180x2/(7 Pn) where Pn is the pole pair number.
</p> |
