Synchronous motor with permanent magnet provided on magnetic pole end
AssigneeOkuma Corporation
InventorMasayuki Nashiki
Life of this patent
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Abstract
A synchronous motor comprising permanent magnets (35, 41) with N poles arranged at ends of N magnetic poles of a rotor, permanent magnets (38, 34) with S poles arranged at ends of S magnetic poles of the rotor, magnetic pole portions (40) made of soft magnetic member at middle portion of the N magnetic poles of the rotor, and magnetic pole portions (39) made of soft magnetic member at middle portion of the S magnetic poles of the rotor. The synchronous motor has a structure in which the respective N and S magnetic poles are shifted in the rotor rotation direction relatively by NN/NR of a stator slot pitch, wherein NN and NR are integers equal to or less than the number of poles formed in the rotor.
Claims9
A synchronous motor, comprising:
- a pair of permanent magnets;
- a first permanent magnet, having a North pole directed radially outward, arranged at one or more radial ends in a rotation direction of a North magnetic pole of a rotor;
- a second permanent magnet, having a South pole directed radially outward, and adjoining the first permanent magnet, arranged at one or more radial ends in a rotation direction of a South magnetic pole of the rotor;
- a magnetic pole portion made of soft magnetic member, arranged in a middle portion of the rotor in the rotation direction of the North magnetic pole of the rotor;
- and
- a magnetic pole portion made of soft magnetic member, arranged in a middle portion of the rotor in the rotation direction of the South pole magnetic pole of the rotor.
A synchronous motor having a pair of stators, a pair of rotors, and a field winding, wherein each rotor comprises
- a permanent magnet with a North pole arranged radially outward, provided for every electric angle of 360° in a rotation direction of a magnetic pole of the rotor,
- a permanent magnet with a South pole arranged radially outward, provided at an end in a rotation direction, of a South magnetic pole, and
- a magnetic pole potion made of soft magnetic member provided at a middle portion in the rotation direction, of the South magnetic pole, and
- a second rotor comprises
- a permanent magnet with a South pole arranged radially outward, provided at an end in the rotation direction, of a magnetic pole which is shifted by an electric angle 180° from the permanent magnet with a North pole arranged radially outward of each rotor,
- a permanent magnet with a North pole arranged radially outward, provided at an end in the rotation direction, of a North magnetic pole, and
- a magnetic pole portion made of soft magnetic member, provided at a middle portion in the rotation direction of the North magnetic pole.
Dependencies are inferred from the claim text.