Electricity: motive power systems – Braking – 'plugging' or application of reverse power to motor
Reexamination Certificate
2005-07-26
2005-07-26
Ip, Paul (Department: 2837)
Electricity: motive power systems
Braking
'plugging' or application of reverse power to motor
C318S362000, C318S286000, C318S375000
Reexamination Certificate
active
06922032
ABSTRACT:
In the driving operation of a sensorless three-phase motor to be used in a rotation at a comparatively low speed (approximately 2000 RPM or less) and to be bipolar driven, the number of rotations and a rotating position are accurately detected from an induced voltage and a reverse rotation brake is applied in an accurate phase, and furthermore, a short brake is applied at a set rotation number signal or less also in braking. Consequently, it is possible to prevent phase switching from being carried out in an erroneous timing and to prevent a rotation in a reverse direction by an inertia.
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Ip Paul
Merchant & Gould P.C.
Rohm & Co., Ltd.
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