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US 11,962,194 B2Granted
Rotating electric machine
AssigneeDenso Corporation
InventorYuki Takahashi
Life of this patent
Estimating the term…
Abstract
A rotating electric machine includes a field system and an armature. The field system includes a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction. The armature includes a multi-phase armature coil. Either of the field system and the armature is configured as a rotor. The magnet section is configured to have an easy axis of magnetization oriented such that the closer the position to a d-axis in the circumferential direction, the more the direction of the easy axis of magnetization becomes parallel to the d-axis.
Claims12
A rotating electric machine comprising:
- a field system including a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction;
- and
- an armature including a multi-phase armature coil,
- wherein
- either of the field system and the armature is configured as a rotor,
- the magnet section includes first magnets that each correspond to one of the magnetic poles of the magnet section and are arranged at predetermined intervals in the circumferential direction, and the magnet section also includes second magnets each of which is arranged between one circumferentially-adjacent pair of the first magnets to extend across a q-axis,
- each of the first magnets is oriented to form a magnet magnetic path parallel to a d-axis,
- surfaces of the second magnets facing the first magnets constitute magnetic flux acting surfaces through which magnetic flux flows into or out of the second magnets,
- each of the second magnets is oriented to form, at the q-axis, a magnet magnetic path deviated from a direction perpendicular to the q-axis,
- 0<θa≤2π/S, where S is a number of phases of the armature coil and θa is a main magnetic pole angle which is defined, for each of the first magnets, as an angle between (i) a straight line extending through one of two q-axis-side ends of the first magnet in the circumferential direction and an axis of the rotor and (ii) a straight line extending through the other of the two q-axis-side ends of the first magnet in the circumferential direction and the axis of the rotor, and
- either (i) 2π/5<θa≤2π/3, (ii) θa=2π/3, or (iii) θa=2π/5.
8 more elements
A rotating electric machine comprising:
- a field system including a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction;
- and
- an armature including a multi-phase armature coil,
- wherein
- either of the field system and the armature is configured as a rotor,
- the magnet section includes first magnets that each correspond to one of the magnetic poles of the magnet section and are arranged at predetermined intervals in the circumferential direction, and the magnet section also includes second magnets each of which is arranged between one circumferentially-adjacent pair of the first magnets to extend across a q-axis,
- each of the first magnets is oriented to form a magnet magnetic path parallel to a d-axis,
- surfaces of the second magnets facing the first magnets constitute magnetic flux acting surfaces through which magnetic flux flows into or out of the second magnets,
- each of the second magnets is oriented to form, at the q-axis, a magnet magnetic path deviated from a direction perpendicular to the q-axis, and
- either (i) 2π/3<θa≤4π/5, (ii) θa=4π/5, or (iii) 4π/5<θa<π, where θa is a main magnetic pole angle which is defined, for each of the first magnets, as an angle between (i) a straight line extending through one of two q-axis-side ends of the first magnet in the circumferential direction and an axis of the rotor and (ii) a straight line extending through the other of the two q-axis-side ends of the first magnet in the circumferential direction and the axis of the rotor.
7 more elements
Dependencies are inferred from the claim text.