Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2007-02-07
2011-11-01
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400010, C318S400340, C318S400350
Reexamination Certificate
active
08049449
ABSTRACT:
In a brushless motor for an electric power steering device having a configuration of 2 poles and 3 slots, or of an integral multiple thereof, a stator coil is supplied with current containing a higher harmonic component. A difference of 0.5% to 1.5% is provided between the higher harmonic component content rate of the stator coil current and the higher harmonic component content rate of the induced electromotive force generated in the stator coil with rotation of a permanent magnet, thereby mitigating the influence by an armature reaction generated in the induced electromotive force to reduce torque ripples. The difference between the higher harmonic component content rates is set on the basis of a change that occurs in the induced electromotive force due to the armature reaction at a time of supplying electricity to the armature coil.
REFERENCES:
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4912378 (1990-03-01), Vukosavic
patent: 4922169 (1990-05-01), Freeman
patent: 5345156 (1994-09-01), Moreira
patent: 5422570 (1995-06-01), Moreira
patent: 5473240 (1995-12-01), Moreira
patent: 5481166 (1996-01-01), Moreira
patent: 6081091 (2000-06-01), Mitchell et al.
patent: 7256564 (2007-08-01), MacKay
patent: 06-098596 (1994-04-01), None
patent: 2000-341984 (2000-12-01), None
patent: 2004-274963 (2004-09-01), None
International Search Report mailed May 15, 2007 for International Application No. PCT/JP2007/052093.
International Preliminary Report on Patentability mailed Aug. 28, 2008 for International Application No. PCT/JP2007/052093.
Written Opinion of the International Searching Authority mailed Aug. 28, 2008 for International Application No. PCT/JP2007/052093.
Okubo Masayuki
Shikine Youichirou
Yamazaki Takeshi
Benson Walter
Dinh Thai
Mitsuba Corporation
Wenderoth , Lind & Ponack, L.L.P.
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