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Dynamic Braking with minimal components [SOLVED]
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anishkgt:
Hi All,

I was looking for a simple braking circuit for a DC motor like the 775 rate 12-24V. here is a circuit that i had come up with. The components names are generic, yet to measure the reverse current from the motor.

Would appreciate if somebody could advise how ideal this would be ? Or should i go with an H-Bridge that has the breaking built into it ?
T3sl4co1l:
What is the braking regenerating into?  Just a resistor?

The EMF is in the same direction as rotation.  If it was spinning forward, it will be braking forward as well.  Only the current reverses. :)

Normally a synchronous bridge (half or full) is used, both for efficiency and control reasons, as well as because it is regenerative.  Of course in that case, the supply must be able to absorb regeneration, which is fine for a battery supply, but will need an additional shunt regulation circuit if it is, for example, supplied from diodes and so has no sinking capability otherwise.

Tim
anishkgt:
Not really regenerating into anything. Just used the term as the principle is what I was looking for.

I just need to stop the motor when the power to it is cut-off. The load is a circular saw blade. So do want it free wheel when a cut is done. Without the load it stops dead but with a load it takes some time but better than with out it.

Was looking for something more efficient, reduce the free wheeling to a minimum within 5seconds
or a few more.

I could do this with an arduino but don’t want waste an ic just for pwm. I have a pwm module from eBay lying around which I am planning to use here as the power source. So I don’t want to send the current back.


Www.Georgehobby.wordpress.com

Equipments: DSO104z, Hakko FX888D, Brymen BM869s

Sent from my iPhone using Tapatalk
T3sl4co1l:
How about using a relay (NC contacts) to switch a resistor in parallel with the motor when it's not powered?

Tim
anishkgt:

--- Quote from: T3sl4co1l on December 30, 2018, 03:55:50 pm ---How about using a relay (NC contacts) to switch a resistor in parallel with the motor when it's not powered?

Tim

--- End quote ---

Yea I did think of that but wasn’t sure of the rating of the contacts when the motor terminals short.


Www.Georgehobby.wordpress.com

Equipments: DSO104z, Hakko FX888D, Brymen BM869s

Sent from my iPhone using Tapatalk
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