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searching brushless motor with sensors, 12V, 500-700Watt

Discussion in 'Electronic Design' started by Wolfgang, Mar 3, 2007.

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  1. Wolfgang

    Wolfgang Guest

    Hello,

    I search for an application with very high torque request at zero
    speed
    a brushless motor with sensors. Parameters: 12V, 500-700Watt

    Who can tell a manufacturer of such a motor?

    Best regards

    Wolfgang
     
  2. Jamie

    Jamie Guest

    Look at stepper motors., they have a high torque rate of
    holding how ever, they work in degree's/ indexes per turn. the more you
    get the more expensive and at 700 Watts, that sounds very expensive.

    On the second note how ever, they require no feed back.
     
  3. John Barrett

    John Barrett Guest

    http://www.pittmannet.com/pdf/lcm_bulletin.pdf

    the 14xx6 motors have a stall current of 54 amps at 12 v -- just over 600
    watts -- and come with HP encoders for servo applications
     
  4. Try Alxion, or Danaher.
    What you don't say, is how fast you want to go, or how 'high', 'high
    torque' is?. The problem will be maintaining torque at higher rotational
    speeds with such a low supply voltage (this is why cars that use high
    power motors for things like steering, and traction applications, all use
    higher voltage supplies). It will almost certainly have to be 'custom',
    because of the low supply voltage (Bosch do make some units like this for
    12v). Some of the smaller Danaher units, may be available for this
    voltage.

    Best Wishes
     
  5. Tim Wescott

    Tim Wescott Guest

    On the third note:

    - they're far bulkier for the torque than a brushless
    - they consume far more power for the torque than a brushless
    - if the load should exceed the torque capability of the motor the
    motor's average torque will go to zero, leading to a failure mode that
    is, at best, unrecoverable until things stop.

    Stepper motors are good for simple applications when you can afford to
    significantly over specify. Other than that they're way more trouble
    than they're worth.

    --

    Tim Wescott
    Wescott Design Services
    http://www.wescottdesign.com

    Posting from Google? See http://cfaj.freeshell.org/google/

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at http://www.wescottdesign.com/actfes/actfes.html
     
  6. One low cost solution is an automotive inverter and a 1 HP induction motor.
    You probably need a 1500 W inverter to handle starting current surge. PSC
    or capacitor start motors have high starting torque. If you will be running
    at very low speeds, it may be better to use a three phase motor and a VF
    drive. You can directly convert the 12 VDC to 180 VDC internal DC bus for
    the drive.

    I have also rewound small single phase motors to be three phase, and with
    heavy windings to run directly from 12 VDC. I still need to build a good
    low voltage VF drive, however.

    Paul
     
  7. Tim Wescott

    Tim Wescott Guest

    Have you done a web search? I'd check Maxon, Escap (Faulhauber, if I
    have the spelling right) and Aveox. Aveox is a US company, but Maxon
    and Escap are both Swiss, so it may be easier for you to talk to the
    factory.

    --

    Tim Wescott
    Wescott Design Services
    http://www.wescottdesign.com

    Posting from Google? See http://cfaj.freeshell.org/google/

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at http://www.wescottdesign.com/actfes/actfes.html
     
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