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How to choose a motor? — Parallax Forums

How to choose a motor?

ArchiverArchiver Posts: 46,084
edited 2003-09-11 16:55 in General Discussion
Colleagues,

Please help me to choose the motor for the vehicle, which:

1. Uses two motos, so it can steer like a tank.
2. Can travel 5 miles in 1 hour (velocity 2.2m/s) on level asphalt.
3. Has a weight of 20lbs (10kg).
4. Has 8" (200mm) diameter wheels.

How big sould the torque be? Is there a formula?
Which places would you you suggest to look for a motor?
Any kind of motor will do.

Thanks!

Sincerely,
Nick

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-09-11 00:27
    Surplus center has surplus cd motors and other neat stuff.

    http://www.surpluscenter.com/electric.asp


    Jason

    --- In basicstamps@yahoogroups.com, "Nick Alexeev" <kender_a@y...>
    wrote:
    >
    >
    > Colleagues,
    >
    > Please help me to choose the motor for the vehicle, which:
    >
    > 1. Uses two motos, so it can steer like a tank.
    > 2. Can travel 5 miles in 1 hour (velocity 2.2m/s) on level asphalt.
    > 3. Has a weight of 20lbs (10kg).
    > 4. Has 8" (200mm) diameter wheels.
    >
    > How big sould the torque be? Is there a formula?
    > Which places would you you suggest to look for a motor?
    > Any kind of motor will do.
    >
    > Thanks!
    >
    > Sincerely,
    > Nick
  • ArchiverArchiver Posts: 46,084
    edited 2003-09-11 00:49
    Wow. That place is a good place to know about. Thanks for the link.
    Big time.

    Although I still do not know what I really need...

    Nick

    --- In basicstamps@yahoogroups.com, "jbirnsch" <jbirnsch@v...> wrote:
    > Surplus center has surplus cd motors and other neat stuff.
    >
    > http://www.surpluscenter.com/electric.asp
    >
    >
    > Jason
    >
    > --- In basicstamps@yahoogroups.com, "Nick Alexeev" <kender_a@y...>
    > wrote:
    > >
    > >
    > > Colleagues,
    > >
    > > Please help me to choose the motor for the vehicle, which:
    > >
    > > 1. Uses two motos, so it can steer like a tank.
    > > 2. Can travel 5 miles in 1 hour (velocity 2.2m/s) on level
    asphalt.
    > > 3. Has a weight of 20lbs (10kg).
    > > 4. Has 8" (200mm) diameter wheels.
    > >
    > > How big sould the torque be? Is there a formula?
    > > Which places would you you suggest to look for a motor?
    > > Any kind of motor will do.
    > >
    > > Thanks!
    > >
    > > Sincerely,
    > > Nick
  • ArchiverArchiver Posts: 46,084
    edited 2003-09-11 14:06
    Don't forget that once you pick a motor you think will work, calculate the
    power consumption over the time to run required and select the power source
    (battery) and then determine the weight of the power source, then try again
    to pick a motor until everything is considered. Remember that the battery
    will not put out the same voltage throughout it's discharge cycle unless it
    is very overcapacity and in that case you are carrying excess weight. On
    another thought, you don't need two motors. Drive both with a differential
    arrangement and apply a brake to one or the other to turn. This may save
    considerable weight and energy as the break just must be applied
    intermittantly but the motor would need to be powered at all times.

    jim
    http://www.geocities.com/jimforkin2003/

    Original Message
    From: Nick Alexeev [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=zcgEK2MhILhEjVVhR9kKleXv1zoj7Nq1C-95XoIVBGscQPSXW3XCBDXZO5PEagDy8UCaKSS150w]kender_a@y...[/url
    Sent: Wednesday, September 10, 2003 7:50 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: How to choose a motor?


    Wow. That place is a good place to know about. Thanks for the link.
    Big time.

    Although I still do not know what I really need...

    Nick

    --- In basicstamps@yahoogroups.com, "jbirnsch" <jbirnsch@v...> wrote:
    > Surplus center has surplus cd motors and other neat stuff.
    >
    > http://www.surpluscenter.com/electric.asp
    >
    >
    > Jason
    >
    > --- In basicstamps@yahoogroups.com, "Nick Alexeev" <kender_a@y...>
    > wrote:
    > >
    > >
    > > Colleagues,
    > >
    > > Please help me to choose the motor for the vehicle, which:
    > >
    > > 1. Uses two motos, so it can steer like a tank.
    > > 2. Can travel 5 miles in 1 hour (velocity 2.2m/s) on level
    asphalt.
    > > 3. Has a weight of 20lbs (10kg).
    > > 4. Has 8" (200mm) diameter wheels.
    > >
    > > How big sould the torque be? Is there a formula?
    > > Which places would you you suggest to look for a motor?
    > > Any kind of motor will do.
    > >
    > > Thanks!
    > >
    > > Sincerely,
    > > Nick


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  • ArchiverArchiver Posts: 46,084
    edited 2003-09-11 16:55
    Hi Nick,

    look for a e-mail from me.

    the calc's I have are rough and not in simple to use form, but should
    give you a couple places to get your calcs started.

    if you are using a bogus e-mail (like many people on these lists) let
    me know where to send them.

    I'd post here, but they are really rough and a couple of pages.

    Dave



    --- In basicstamps@yahoogroups.com, "Nick Alexeev" <kender_a@y...>
    wrote:
    >
    >
    > Colleagues,
    >
    > Please help me to choose the motor for the vehicle, which:
    >
    > 1. Uses two motos, so it can steer like a tank.
    > 2. Can travel 5 miles in 1 hour (velocity 2.2m/s) on level asphalt.
    > 3. Has a weight of 20lbs (10kg).
    > 4. Has 8" (200mm) diameter wheels.
    >
    > How big sould the torque be? Is there a formula?
    > Which places would you you suggest to look for a motor?
    > Any kind of motor will do.
    >
    > Thanks!
    >
    > Sincerely,
    > Nick
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