Stepper motor apparatus and method for controlling stepper...

Details Stepper motor apparatus and method for controlling stepper... Stepper motor apparatus and method for controlling stepper...

2007-06-11

2010-12-28

Masih, Karen (Department: 2837)

Electricity: motive power systems

Open-loop stepping motor control systems

C318S685000, C318S590000

Reexamination Certificate

active

07859216

ABSTRACT:
The object of the invention is to provide a stepper motor apparatus and a method for controlling a stepper motor, and particularly relates to a stepper motor apparatus for driving a pointer and a method for controlling the stepper motor. When an ignition switch is turned on, CPU12starts to feed a driving signal into the stepper motor in order to cause the stepper motor to rotate in a backward direction. Upon detecting that a protrusion9is in abutment with a stopper10on the basis of induced voltage generated on excitation coils5and6, CPU stop rotation of the stepper motor3by maintaining the driving signal's phase at which the abutment is detected. Subsequently, CPU12feeds the driving signal into the stepper motor3in order to drive the stepper motor3to rotate in a direction where the protrusion9is driven against the stopper10, and then stops rotation of the stepper motor3in a forward direction by maintaining a predetermined phase at which the driving signal arrives. Thereafter, CPU12drives the stepper motor to rotate such that a pointer1homes in on its commanded position θi.

REFERENCES:
patent: 2009/0045767 (2009-02-01), Bergeron et al.
patent: 2003-125599 (2003-04-01), None

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