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US 6,784,590 B2Granted
Permanent magnet motor
AssigneeJapan Servo Co., Ltd.
InventorsKazuo Ohnishi, Toshimi Abukawa, Tokio Sekiguchi
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AssigneeJapan Servo Co., Ltd.
InventorsKazuo Ohnishi, Toshimi Abukawa, Tokio Sekiguchi
Estimating the term…
A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween. The armature has a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein a composite of two vectors of cogging torque generated by the auxiliary grooves is deviated by 180° or 120° from a vector of cogging torque generated by the winding grooves in the sixth harmonic plane, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 80% or 86% of a width of a pole pitch portion of the air gap magnetic flux density waveform. Each vector of cogging torque generated by each of the plurality of auxiliary grooves is deviated by 180° or 120° from a vector of cogging torque generated by the winding grooves in the sixth harmonic plane, respectively, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 80% or 86% of a width of a pole pitch portion of the air gap magnetic flux density waveform.
A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween, the armature having a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein a composite of two vectors of cogging torque generated by the auxiliary grooves is deviated by 180° from a vector of cogging torque generated by the winding grooves in the sixth harmonic plane, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 80% of a width of a pole pitch π portion of the air gap magnetic flux density waveform.
A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween, the armature having a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein each vector of cogging torque generated by each of the plurality of auxiliary grooves is deviated by 180° from a vector of cogging torque generated by the winding groove in the sixth harmonic plane, respectively, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 80% of a width of a pole pitch π portion of the air gap magnetic flux density waveform.
A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween, the armature having a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein a composite of two vectors of cogging torque generated by the auxiliary grooves is deviated by 120° from a vector of cogging torque generated by the winding grooves in the sixth harmonic plane, and wherein a width of a portion of an air zap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 86% of a width of a pole pitch π portion of the air gap magnetic flux density waveform.
A permanent magnet motor comprising a permanent magnet and an armature having a plurality of winding grooves facing the permanent magnet with an air gap therebetween, the armature having a plurality of auxiliary grooves on a magnetic pole surface thereof, wherein each vector of cogging torque generated by each of the plurality of auxiliary grooves is deviated by 120° from a vector of cogging torque generated by the winding groove in the sixth harmonic plane, respectively, and wherein a width of a portion of an air gap magnetic flux density waveform that includes a value that is more than 90% of a peak value of the air gap magnetic flux density waveform is less than 86% of a width of a pole pitch π portion of the air gap magnetic flux density waveform.
Dependencies are inferred from the claim text.