Indicating instrument

Details Indicating instrument Indicating instrument

2006-04-25

2006-04-25

Fletcher, Marlon T. (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S696000, C116S062100, C116S047000, C116S288000, C073S001880

Reexamination Certificate

active

07034495

ABSTRACT:
An output port open control device (65) allows a port (P3) which outputs PWM signals of a Cos+ side to be in a high impedance state in a period in which respective PWM signals of Cos+ and Cos− supplied to a S-phase coil (22) of a stepping motor (2) are in a ground level, induced voltage corresponding to a magnetic flux variation caused in accordance with rotation of a magnet rotor (23) is generated in the S-phase coil (22), a voltage comparator (72) compares the induced voltage with a previously set threshold value and outputs presence or absence of the induced voltage, and a zero-reset judging device (66) determines that a pointer (4) is in the middle of rotation when the induced voltage is detected, and determines that the pointer (4) is in contact with a stopper mechanism (5) when it is not detected.

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