Electricity: motive power systems – Synchronous motor systems
Reexamination Certificate
2006-08-22
2006-08-22
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
C318S721000, C318S723000
Reexamination Certificate
active
07095204
ABSTRACT:
A startup control method of a BLDC motor is disclosed. The method can control the BLDC motor to prevent the generation of a transient current such that the vibration of the BLDC motor can be reduced at the startup stage and perform a stable conversion into a sensorless operation mode such that the startup failure rate of the BLDC motor can be reduced. The startup control method includes commutating a current applied to stator windings according to a rotor position. The method of operating the BLDC motor includes a rotor position that is forcibly aligned and so that phase commutation is performed, a back-electromotive force (back-emf) is detected from a lead voltage of a phase of a voltage which is not applied thereto after performing phase commutation and a determination is performed as to whether the detected back-emf is in a rising interval. The lead voltage of the phase of the voltage which is not applied thereto is integrated, such that if the back-emf is in a rising interval and if an instance that the integration result is greater than a predetermined value a phase commutation time point is set and conversion into a sensorless operation mode is performed if the back-emf detected from the lead voltage is in a stable interval, based on a frequency of the voltage applied to the stator winding.
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Choi Hyen Young
Kim Dae Kyong
Lee Kwang Woon
Lee Sang Taek
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