Choosing a suited brushless motor.

Discussion in 'General Electronics Chat' started by Jan-Abraham Joubert, May 4, 2016.

  1. Jan-Abraham Joubert

    Thread Starter New Member

    Apr 3, 2016
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    I am an engineering student currently working on a project where I have to replace the starter and alternator of a self-launch glider engine with a brushless motor for better weight distribution and weight reduction. I have done my calculations, but I am concerned whether I would be able to find a suited motor that will fit the specifications.
    The motor has to fit on the tapered crank shaft, on the old alternator fittings. Don"t know if this is possible?
    The specification calculated are as follow:
    Power = 700 Watt
    Voltage = 12 Volt
    Kv rating = 650-700

    Will I be able to find a motor for these specific specification??
     
  2. BR-549

    Well-Known Member

    Sep 22, 2013
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    What does starter mean?

    Do you have any photos of the contraption?
     
    Last edited by a moderator: May 5, 2016
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That is only about 1hp, as already stated, more info is needed.
    Might be easier to integrate a P.M. DC motor?
    Max.
     
  4. Jan-Abraham Joubert

    Thread Starter New Member

    Apr 3, 2016
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    Starter= Ignition system, but that's not the problem, because if the motor produces enough power and a initial starting torque it will be able to crank the engine.
    I do not have any at the moment but will post as soon as I get photos, My main problem is the mounting of the motor.
    Thanks,
     
  5. Jan-Abraham Joubert

    Thread Starter New Member

    Apr 3, 2016
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    What information are specifically looking for? I am very unfamiliar with Electrical motors seeing a am a mechanical student. But I will do some research on the P.M DC motor.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    'Starter and Alternator' is rather vague, is the system similar to automotive? series motor starter? Alternator generator? Battery supplied system? Starting what?
    Max.
     
  7. BR-549

    Well-Known Member

    Sep 22, 2013
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    So, you are trying to replace a starter motor?
     
  8. Jan-Abraham Joubert

    Thread Starter New Member

    Apr 3, 2016
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    It acts as a starter, but once the engine is running it switches over and charges the battery as a alternator does.

    It for a small aircraft Twin-cylinder in line two-stroke engine, where the motor has to crank the engine. Once the engine is started the switch is made where the motor then acts as a alternator/ battery supply system.
     
    Last edited by a moderator: May 5, 2016
  9. BR-549

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    Sep 22, 2013
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    Last edited by a moderator: May 5, 2016
  10. Jan-Abraham Joubert

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    Apr 3, 2016
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  11. BR-549

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    Sep 22, 2013
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    I didn't do any sizing or anything. They might not have what you need. I was trying to figure out what is was.

    I am familiar with motor-generator SETS. (2) Not all in one.

    But I like the idea. They should do that on cars.
     
  12. Jan-Abraham Joubert

    Thread Starter New Member

    Apr 3, 2016
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    I am positive this concept will work, at the moment my only struggle is to fine the suited motor that will fit on the mountings with the correct specifications. But I will post my finding once a complete the project.
     
  13. BR-549

    Well-Known Member

    Sep 22, 2013
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    Oh, I'm sure it will work. But your problem is not finding a motor. You don't need a motor.

    You need a starter generator. BIG difference.

    You better have some money.

    I could be wrong.........but my luck has always been expensive.
     
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