Method and device for detecting initial excitation phase of...

Details Method and device for detecting initial excitation phase of... Method and device for detecting initial excitation phase of...

2006-06-26

2008-10-21

Masih, Karen (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S696000, C318S432000

Reexamination Certificate

active

07439701

ABSTRACT:
A method and device for detecting an initial excitation phase of a stepping motor is provided, by which an initial excitation phase of a rotor corresponding to a position of a stopper can be detected with a unit of a stepping angle of a microstep drive which is smaller than that of a full step drive without using elements such as magnetoelectric elements. Upon appropriately changing an excitation phase of a stepping motor, on the basis of a generated pattern of an induced electromotive force in an exciting coil in a non-excitation state upon a full step drive, whether or not a pointer comes in contact with a stopper to stop a reverse rotation of the pointer and rotor is judged so that it is specified on which excitation phase the pointer and rotor are reversed, thereby detecting an initial excitation phase of the rotor corresponding to a position of the stopper.

REFERENCES:
patent: 6806625 (2004-10-01), Ogawa et al.
patent: 2002/0180282 (2002-12-01), Suzuki et al.
patent: 2006/0049791 (2006-03-01), Larsson
patent: 38 32 258 (1990-03-01), None
patent: 102 25 610 (2004-01-01), None
patent: H8-322293 (1996-12-01), None
patent: 2001/298993 (2001-10-01), None

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