Stepping motor driving circuit having failsafe function

Details Stepping motor driving circuit having failsafe function Stepping motor driving circuit having failsafe function

1991-07-25

1993-01-26

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

051825074

ABSTRACT:
A driving circuit for driving a stepping motor has a plurality of excitation coils, a plurality of excitation transistors for driving the excitation coils of the stepping motor, respectively, and at least one chopping transistor for effecting chopping control of current flowing to the excitation coils. A fault diagnosis transistor is connected in parallel with the chopping transistor. A current limiting resistance is serially connected to the fault diagnosis transistor. A CPU selectively turns on and off the fault diagnosis transistor. The CPU detects output states of the chopping transistor assumed respectively when the fault diagnosis transistor is turned on and turned off. The CPU compares the detected output levels of the chopping transistor with respective predetermined logic levels and detects faults in the driving circuit from results of the comparisons.

REFERENCES:
patent: 4358725 (1982-11-01), Brendemuehl
patent: 4423366 (1983-12-01), Gottwald
patent: 4710690 (1987-12-01), Reid et al.

Affiliated with

Also associated with

Rating

Stepping motor driving circuit having failsafe function does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Stepping motor driving circuit having failsafe function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stepping motor driving circuit having failsafe function will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1414760