Method and apparatus for detecting a stall condition in a...

Details Method and apparatus for detecting a stall condition in a... Method and apparatus for detecting a stall condition in a...

2005-03-01

2005-03-01

Martin, David (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S696000, C318S671000, C318S560000

Reexamination Certificate

active

06861817

ABSTRACT:
Stepped rotary motion is imparted to the rotor of a stepping motor by alternately driving at least first and second coils which interact with a plurality of magnetic poles on the rotor. When each of the coils transitions from a driven to a non-driven state, the continued motion of the rotor causes a back electro-motive force to be generated in the coil. The electro-motive forces produced by the coils are rectified, integrated, and then compared with a threshold to determine if a motor stall condition exists.

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PCT International Search Report.

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