Basic motor knowledge for my project

Discussion in 'The Projects Forum' started by braindead, May 13, 2010.

  1. braindead

    Thread Starter New Member

    May 12, 2010
    28
    0
    Hi, I never really worked with motors. Are these calculations valid?

    Just feeling some specs out of the air I would say about 20 cm at about 60-180 times per minute with a force of 4 kg. Translating it to proper units, I get:

    0.6 m/s max @ 40 N. Although, I guess the 4 kg is more important at low speeds, so perhaps I could actually use the low-spec and get something like 0.2 m/s @ 40 N. So that should amount to power of 8 Watts radial or axial power. Is that correct? Is the terminology correctly used?

    Torque does not matter, right? Getting the correct radial power is of essence, and then gearing can be used to use the power correctly, correct?

    What does "nominal torque" mean? What other interesting torques are there?

    Can I gear using "belts" and wheels (what are they called?), you know the kind find in for example cassette players, although larger in my case of course. The kind that has rubber bands around it. I am just guessing they will be cheaper?

    I found one engine here:

    https://www1.elfa.se/data1/wwwroot/assets/datasheets/rjES_RoHS_e.pdf

    4IK25RGN-CW2E

    It is rated at 25 Watt axial power and has some type of speed controller and everything. Is there any danger working with this type of device at home? I am thinking of putting both the engine and speed controller unit into a box, and just let the shaft stick out from it. Anything in particular I should have in mind concerning safety? Do I need to connect it with a grounded outlet?
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    I see you are inexperienced, so it won't be safe to work with the mains voltage. Hire a professional to do the job for you. That is an advice.

    However, what do you want to do with the motor?
     
  3. braindead

    Thread Starter New Member

    May 12, 2010
    28
    0
    Thank you for the advice. But since I am doing this as a hobby, hiring a professional would be utterly pointless. :)

    How about answering my questions, if you think you are more knowledgeable?

    Best Regards,
    Braindead
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Can you explain what is the application?
     
  5. braindead

    Thread Starter New Member

    May 12, 2010
    28
    0
    The application is to rotate a fly wheel according to my specifications. See my other threads for the specs.
     
  6. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Belts and wheels are usually called pulleys.

    Nominal torque is the amount of torque that is available in the standard loading, peak efficiency

    Torque in a motor doesn't matter per se if you are not using the shaft as a direct mount.

    Gearing can change a high rpm, low torque into a low rpm high torque drive.

    So if you need high speed and high torque, it matters a lot.

    Also, the amp draw of the motor when the rotor is locked (not spinning) will blow fuses or trip breakers or burn stuff up because it is too low of a torque rated motor to get the load moving before the other components burn up from too high of an amp draw for too long.
     
  7. kingdano

    Member

    Apr 14, 2010
    377
    19
    all due respect, he was concerned for YOUR safety.

    no need for the attitude.
     
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