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Old 22-02-17, 09:23 PM   #1
Bibio
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Default OMO, back EMF brushed dc motor speed control

so who amongst us knows what i'm talking about and if so i'm needing a circuit. needs to be temperature compensating and no PWM.

i already have a hall effect servo design which i can hack the speed change out of to bolt onto the front end of the back EMF circuit.

its only two speed with no reverse of brake needed.

once i have a schematic i can work out the voltage etc.etc from the motor and adjust the design.

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Old 22-02-17, 09:35 PM   #2
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Default Re: OMO, back EMF brushed dc motor speed control

Not a clue but does it look like this ???
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File Type: jpg IMG_0231.jpg (95.4 KB, 0 views)
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Old 23-02-17, 09:34 AM   #3
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Default Re: OMO, back EMF brushed dc motor speed control

Alas I have no idea what you are describing. But that photo is brilliant. ☺
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Old 23-02-17, 11:15 AM   #4
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Default Re: OMO, back EMF brushed dc motor speed control

I do understand what he's talking about, but way above my pay grade to actually do what is being asked !!!


What's wrong with PWM ?
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Old 23-02-17, 05:43 PM   #5
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Default Re: OMO, back EMF brushed dc motor speed control

PWM can cause instability under varying load.

PWM is ok for RC cars and such but not as good in critical speed situations.
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Old 24-02-17, 09:17 AM   #6
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Default Re: OMO, back EMF brushed dc motor speed control

I hope this is an electric SV project. SV240VAC anyone?
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Old 24-02-17, 09:44 AM   #7
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Default Re: OMO, back EMF brushed dc motor speed control

this is interesting

https://sites.google.com/site/hobbyd...g-back-emf-sen
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Old 24-02-17, 10:58 AM   #8
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Default Re: OMO, back EMF brushed dc motor speed control

Don't think that lot will power a SV very far !!
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Old 24-02-17, 08:27 PM   #9
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Default Re: OMO, back EMF brushed dc motor speed control

Never designed one, just bought and used industrial versions. They had AC supplies so used Thyristor bridges, and used tacho-feedback for best speed control.
Used some small DC supplied ones that used MOSFETs, similar arrangement to a SMPS Buck circuit so with PWM.
I have old textbooks on power electronics that give the basic circuits.
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Old 08-04-17, 08:27 PM   #10
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Default Re: OMO, back EMF brushed dc motor speed control

well i designed one and have sent the pcb files off for manufacture. will it work.. ermm will have to wait and see. whats it for.. its for a hifi turntable.

this is the reason i have not been on the forum.
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