Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2006-09-12
2006-09-12
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S244000, C318S246000, C318S700000, C318S737000
Reexamination Certificate
active
07106013
ABSTRACT:
A motor drive apparatus includes a comparison circuit comparing voltages of 3-phase coil terminals and the voltage of a neutral point terminal of a 3-phase brushless motor to determine which voltage is higher/lower, a zero ampere current detection circuit detecting, based on the comparison result by the comparison circuit, that the coil current of a position detection phase becomes 0 A, a position detection circuit detecting a zero cross point of the voltage of the position detection phase based on the comparison result by the comparison circuit after the coil current becomes 0 A. Therefore, the zero cross point can be accurately detected without introducing a mask period.
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Narumi Satoshi
Tamagawa Hiroyuki
Leykin Rita
McDermott Will & Emery LLP
Renesas Technology Corp.
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