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    Motor Speed
    by Martin555 ๐Ÿ‡ฌ๐Ÿ‡ง ( Rear Admiral)
    ๐Ÿ“ฃ










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    8 Posts 7 Replies 0 Photos 6 Likes
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    Martin555
    Rear Admiral
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 4 hours ago
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    Thank you Dg,
    It was a question that somebody asked me and I said that I would ask on this site.
    Thanks again.

    Martin555.
    1
    If it looks right it probably is.
    DodgyGeezer
    Sub-Lieutenant
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 2 hours ago
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    Unless you have all the parts immediately you will find it difficult to make for the cost of one shipped from China!

    If you need it immediately, you will need to source it in this country, of course. Here is one at twice the Chinese price - ยฃ2.03 to be precise - which is in the UK and should be with you by the end of next week.

    https://www.ebay.co.uk/itm/1-8V-3V-5V-6V-12V-2A-Low-Voltage-...

    If you look closely you will see an NE555 on the board!
    https://www.ebay.co.uk/itm/1-8V-3V-5V-6V-12V-2A-Low-Voltage-Motor-Speed-Controller-PWM-1803B-M216-In-UK/113865219980?hash=item1a82e55f8c:g:77EAAOSwi0RbG4WB
    ๐Ÿ”—
    1
    Martin555
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    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 4 hours ago
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    Excellent thank you Fleet.

    Martin555.
    If it looks right it probably is.
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 1 day ago
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    A 0.1uF (100,000 pico Farad. 10 with four 0s!)) ceramic capacitor Martin
    Yes, that cct will do the job nicely. At very low speeds you might need to tweak the prop to get it started. Or start fast and slow it down a bit.
    ๐Ÿ˜Ž
    1
    Young at heart - slightly older in other places ๐Ÿ˜‰ Cheers Doug
    Martin555
    Rear Admiral
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Hi Dg,
    Have just found this, would this do the trick ?
    what is the 104 cap ?
    https://youtu.be/byYNei7FGmE

    Martin555.
    https://youtu.be/byYNei7FGmE
    ๐Ÿ”—
    โ–ถ๏ธ
    1
    If it looks right it probably is.
    DodgyGeezer
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    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 2 hours ago
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    We have covered this before - dropping volts at low power is probably best done with diodes in series.

    But if you want a motor to move very slowly you probably don't want to drop the volts - to get a very slow speed you may need such a low voltage that the motor can't overcome bearing friction.

    In this case you use pulse width modulation. You send a signal which has full volts for, say, 50% of the time and 0 volts for the rest. That gives you 'half power' - but the motor is given enough volts to be sure of getting it moving.

    This technique is used by the model railway boys for slow speed when shunting. So... something like this?
    https://www.ebay.co.uk/itm/Mini-DC-5A-Motor-PWM-Speed-Contro...
    https://www.ebay.co.uk/itm/Mini-DC-5A-Motor-PWM-Speed-Controller-3V-35V-Speed-Control-Switch-LED-Dimmer-new/191885437600?epid=20008384776&hash=item2cad436aa0:g:bFQAAOSwEIJbnMMk
    ๐Ÿ”—
    1
    MouldBuilder
    Lieutenant
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 6 hours ago
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    I wonder if a variable resistor on the input supply might do the trick. That would be some reduction though for making a safe rotational speed. Doug will have the answer.๐Ÿ˜€
    1
    I promise I will finish a boat project before I start another......Maybe.
    Martin555
    Rear Admiral
    ๐Ÿ“ Motor Speed
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 4 hours ago
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    Hi Guys,
    a quick question.
    How can you slow down the speed rotation of a small motor without using a gear box or a speed controller .

    I can do it using a striped down servo, but i was wandering if it could be done by just using a simple resistor ?

    the motor has to turn very slowly, the idea is it to rotate a prop shaft and prop on a static model just so that you see it turning slowly.

    I have no plans as to what motor would be used and the voltage will be low.

    I was wandering if it could be done really simply.

    martin555.
    If it looks right it probably is.



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