EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Tom18991 on December 06, 2023, 05:37:51 pm
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Looking for advice on how to detect if a DC motor is running, using only its ground wire? No current flows when the motor is off. I'd like to create a yes/no binary signal I can feed to a microcontroller -- high when the motor is running, low when it is not. Is there a tried and true way to do this?
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No current is ever flowing on the ground wire. You mean "neutral"?
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You mean "neutral"?
theres no neutral on DC
Looking for advice on how to detect if a DC motor is running, using only its ground wire?
low side current sensors and a comparator?
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Do you need to check that the motor is not stalled?
The current is higher than normal under stall conditions with power applied.
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You mean "neutral"?
theres no neutral on DC
I missed the DC part. My bad.
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A glass tube reed switch with a coil wound around it. That'll even double as noise filter.
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For industrial use, a DC current switch:
https://www.automationdirect.com/adc/shopping/catalog/sensors_-z-_encoders/current_-a-_voltage_sensors_(ac_-a-_dc)/dc_current_switches# (https://www.automationdirect.com/adc/shopping/catalog/sensors_-z-_encoders/current_-a-_voltage_sensors_(ac_-a-_dc)/dc_current_switches#)