Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by digital or...
Reexamination Certificate
2006-11-08
2008-08-12
Masih, Karen (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by digital or...
C318S400230, C318S400240, C388S902000
Reexamination Certificate
active
07412156
ABSTRACT:
The present invention discloses a brushless dc motor driver circuit capable of reducing vibration or shock noise and a method thereof. The brushless dc motor driver circuit of the present invention comprises a Time-Voltage Digital/Analog Converter. The Time-Voltage Digital/Analog Converter further comprises: at least one magnetic field detecting circuit, at least one counter, and a signal processor. The Time-Voltage Digital/Analog Converter is connected to a driver circuit of a brushless dc motor and detects the periodically varying magnetic field of the brushless dc motor. Based on the rising time and the falling time of the preceding magnetic field variation, the Time-Voltage Digital/Analog Converter calculates the elapsed time from the current phase-change point and generates a linearly rising signal and a linearly falling signal. Then, those two sets of analog signals are used to drive the brushless dc motor. Thereby, the vibration or shock noise of the brushless dc motor is reduced. Besides, the phase switching rate of the brushless dc motor can be modified via adjusting a first magnetic flux density and a second magnetic flux density of the Time-Voltage Digital/Analog Converter.
REFERENCES:
patent: 2006/0267529 (2006-11-01), Piefer et al.
Chen Hsuan-Chuan
Lin Teng-Tsai
Su Wen-Jung
Chow Ming
Feeling Technology Corp.
Masih Karen
Sinorica LLC
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