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Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry

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MrDave
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re: Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry
MrDave   11/22/2011 6:37:33 PM
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Simple, They can look at motor current, or they can turn off the motor for a moment and look for BEMF. I did this back in 1986 using a 4 bit micro.

t.alex
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re: Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry
t.alex   11/11/2011 11:02:28 PM
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Window lift is using DC motor? How can they detect the stall int this case ?

WKetel
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re: Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry
WKetel   11/11/2011 12:33:37 AM
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I know that during the early 1980s I was an engineer at a company that did have a stepper-stall detector board as one of their standard modules. It did work, although I never had occasion to use it. So the concept is very valid and not quite new. BUT it is certainly worth looking at.

MrDave
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re: Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry
MrDave   11/7/2011 2:07:14 PM
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Theoretically, it is possible to measure stall using this method for instrument panel gauges. The currents are much lower and are typically driven directly by the micro (with special ports for stepper motors). With that said, as long as the A/D can be synchronized with the stepper motor action it should be feasible. From what I understand typical instrument panel micros do not have this capability. Also, I have never seen a stepper motor version of a windowlift motor.

t.alex
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re: Back EMF method detects stepper motor stall: Pt. 2—Torque effects and detection circuitry
t.alex   11/5/2011 12:33:30 PM
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Is it applicable in dashboard application or window control ?

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