Simple analog transistor speed control for 1 hp 240 volt lathe motor?

Thread Starter

RESISTA

Joined Sep 4, 2016
3
Hi
is it ok to ask ---maybe foolish ---to dare ask for a very simple motor SPEED control CIRCUIT?
The wood lathe motor can be slowed by ratio pulleys --a long painful clumsy interchangeable
process
all I wanted ( tried other forums--was humiliated)
was a basic circuit without fancy IC ,S ---
a potentiometer controlled ---speed control for a 1 hp 240 volt single ph electric motor --

however --many other forums thought this idea rather dumb ---gave up !--
so ---here goes my last attempt for help ---

appreciate any sage advice on circuits for this motor ---( amateur electronic hobbyist )
but live on a pension --in the back woods ---
( Will upload a foto of this DIY bush lathe --if required)

thankyou ----

RESISTA
 

Alec_t

Joined Sep 17, 2013
10,728
Not all motors can be speed-controlled satisfactorily. What is the motor spec as printed on the motor? What are the capacitor ratings?
 

MaxHeadRoom

Joined Jul 18, 2013
19,738
If it is a 1ph cap start induction motor, don't bother, they do not control at all well, most either replace the motor with a T.M. DC motor or a 3ph motor and a VFD.
(3 ph induction motors control OK).
Max.
 

Thread Starter

RESISTA

Joined Sep 4, 2016
3
Many thanks Max --its indeed a 1 phase cap induction motor --240 volt -
stripped it --no brushes ---id plate is in-decipherable

so ---you saved me great bother ---appreciate
 

Thread Starter

RESISTA

Joined Sep 4, 2016
3
lost both my replies -----

anyhow --Max has clarified --I cannot slow this single PH ==240 volt cap start motor
just have to use my diy hardwood- pulleys ---interchangeable --10 inch 14 inch -17 inch 20 inch -
bolt on ---change belts every time
that's why I asked for a circuit -----to ease the long process ---
at least I know now ---got to get a 3 ph motor ---or DC motor --

thanks again Max -----apologies --tried to upload a foto for u --
but no idea what to type in as URL ---this method does not work -- PC jargon is for
experienced gurus ---
regards
 
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