Device and method for detecting back electromotive force...

Details Device and method for detecting back electromotive force... Device and method for detecting back electromotive force...

2009-02-09

2011-10-04

Masih, Karen (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S400090, C318S400340

Reexamination Certificate

active

08030877

ABSTRACT:
In a back electromotive force phase detecting device, a timing generating unit generates a timing signal indicating a start timing, an intermediate timing and an end timing of a 180-degree electrical angle period in a detection target phase, from an excitation pulse signal. A difference calculating unit receives the timing signal, and calculates a difference between a total PWM control period of the detection target phase during a first-half 90-degree period, and a total PWM control period of the detection target phase during a second-half 90-degree period. In an excitation control device, a control unit changes the capability of driving a motor based on an output of the back electromotive force phase detecting device.

REFERENCES:
patent: 5103151 (1992-04-01), Kondo et al.
patent: 2003/0234623 (2003-12-01), Douglas
patent: 2004/0232874 (2004-11-01), Fukamizu et al.
patent: 2007/0216325 (2007-09-01), Fukamizu et al.
patent: 10-243693 (1998-09-01), None
patent: 2004-350386 (2004-12-01), None

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