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22-02-17, 09:23 PM | #1 |
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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. Bibs |
22-02-17, 09:35 PM | #2 |
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Re: OMO, back EMF brushed dc motor speed control
Not a clue but does it look like this ???
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23-02-17, 09:34 AM | #3 |
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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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23-02-17, 11:15 AM | #4 |
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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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23-02-17, 05:43 PM | #5 |
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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. |
24-02-17, 09:17 AM | #6 |
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Re: OMO, back EMF brushed dc motor speed control
I hope this is an electric SV project. SV240VAC anyone?
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24-02-17, 09:44 AM | #7 |
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Re: OMO, back EMF brushed dc motor speed control
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24-02-17, 10:58 AM | #8 |
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Re: OMO, back EMF brushed dc motor speed control
Don't think that lot will power a SV very far !!
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24-02-17, 08:27 PM | #9 |
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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. |
08-04-17, 08:27 PM | #10 |
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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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