Invention Grant
- Patent Title: Method of controlling a brushless DC motor
- Patent Title (中): 控制无刷直流电机的方法
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Application No.: US11261867Application Date: 2005-10-28
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Publication No.: US07834565B2Publication Date: 2010-11-16
- Inventor: Laurence Armstrong
- Applicant: Laurence Armstrong
- Applicant Address: GB Oldham
- Assignee: Zetex Semiconductors PLC
- Current Assignee: Zetex Semiconductors PLC
- Current Assignee Address: GB Oldham
- Agency: Michael Best & Friedrich LLP
- Priority: GB0424049.5 20041029
- Main IPC: H02P25/08
- IPC: H02P25/08

Abstract:
A method of controlling a brushless DC motor of the type having a stator, comprising a stator winding excitable to generate a stator magnetic field, and a rotor, arranged to rotate with respect to the stator and comprising permanently magnetized material arranged to generate a rotor magnetic field to interact with the stator magnetic field to produce rotation of the rotor. The method comprises the steps of driving current through the stator winding to generate a stator magnetic field to interact with the rotor magnetic field, detecting rotor position with respect to the stator, and cyclically commutating the stator winding current according to rotor position as the rotor rotates. Each commutation cycle includes a drive portion during which current is driven through the stator winding in one sense and at the end of which the driving of current in said sense is ceased. The method further comprises the steps of during an initial portion of each drive portion, driving current through the winding such that the magnitude of the winding current increases and during an end portion of each drive portion, actively reducing the magnitude of the winding current.
Public/Granted literature
- US20060119300A1 Method of controlling a brushless DC motor Public/Granted day:2006-06-08
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