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

Discussion in 'General Electronics Chat' started by RESISTA, Sep 4, 2016.

  1. RESISTA

    Thread Starter New Member

    Sep 4, 2016
    3
    0
    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
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,800
    1,103
    Not all motors can be speed-controlled satisfactorily. What is the motor spec as printed on the motor? What are the capacitor ratings?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    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.
     
  4. RESISTA

    Thread Starter New Member

    Sep 4, 2016
    3
    0
    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
     
  5. RESISTA

    Thread Starter New Member

    Sep 4, 2016
    3
    0
    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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