The back-emf tag has no wiki summary.
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2answers
101 views
Back EMF with Octal Driver / inverter
I have a project which I am using an octal driver/inverter (DARLINGTON ARRAYS) to allow a micro controller to control 4 electromechanical relays. I have been experiencing relay failure and ...
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3answers
314 views
Why should I worry about a motor causing my supply voltage to shoot up when the back-EMF can't exceed the supply voltage?
I have heard people say that in motor control circuits, one must take precautions to keep the motor from feeding back into the power supply, causing the supply voltage to rise, consequently breaking ...
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1answer
1k views
How can I measure back-EMF to infer the speed of a DC motor?
I'm interested in measuring the back-EMF of a motor to determine a motor's speed because it's cheap and requires no additional mechanical parts. How can I measure the back-EMF when I'm driving the ...
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1answer
167 views
Why do some transformers hum less or not at all when lightly loaded?
It can be observed that large power transformers hum more under load. For example, when some devices are powered up, there is brief "twang" sound: a loud hum that quickly decays as the filter ...
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0answers
167 views
higher back-EMF voltage like input voltage in Brushless DC Motor?
Currently I am working on simulation model for the non-control Brushless DC motor in MATLAB/Simulink environment. BLDC parameters are from the paper via IEEE online library. For now, I am not able to ...
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1answer
120 views
Inductance of a HDD BLDC Motor Phase
So I have set up a little experiment which involves a HDD BLDC Motor, a scope and a multimeter. Pretty simple, I know. Is it possible to determine the inductance of a phase by the voltage the phase ...
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1answer
1k views
What are the advantages and disadvantages of using signal diodes instead of resistors?
In the past to create voltage dividers or protect against back emf I have used resistors, but reading about signal diodes those situations are given as examples. I can't really comment on the inductor ...
3
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1answer
633 views
Do solenoids exhibit back EMF like motors?
I just purchased some pinball machine solenoids and was experimenting with them; DC resistance is about 30 ohm, they actuate at about 30 volts, and they hold at about 6. I tried controlling them with ...
