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Thread: Belt Conveyor Drive Efficiency

  1. #1
    chafekar - FMC Technologies Inc. Guest

    Belt Conveyor Drive Efficiency

    I would like to know what are the typical DRIVE EFFICIENCIES (includes electric motor and couplings) considered while selecting Electric Motor Power for Belt Conveyors.
    To put the question in other way: How much should the Electric Motor HP exceed than the maximum calculated horsepower for a Belt Conveyor?

  2. #2
    Rajesh Mendirat - River Consulting, USA Guest
    It depends on the type of motor you are using, and the efficiency is based on the ambient temperature. Typically the efficiencies are

    10-40 0.98
    40-45 0.96
    45-50 0.92
    50-55 0.88
    55-60 0.88
    >60 0.84

  3. Dear Mr. Chafekar,

    The motor nameplate rating is the power output at motor shaft. Hence, motor efficiency is not part of the drive efficiency. However, if you want to know, power input to the motor terminal then motor electrical cum mechanical efficiency will come into picture.

    It is difficult to indicate the drive efficiency values in this forum, because it will have many subjective statements and conditions. However, if you inform your email, it can be informed to you. It is one page table and one page statements.

    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email :
    Tel.: 0091 (0)20 5882916

  4. #4
    chafekar - FMC Technologies Inc. Guest
    Dear Mr. Mulani,

    I would appreciate if you can send me additional information on the matter to the below mentioned e-mail id



  5. Dear Mr Chafekar
    I see you did not get a strong answer to your question.
    What you do is calculate the absorbed power of the conveyor using ISO 5048 in the normal way.
    divide the absorbed power by .97 if you have a fluid coupling
    divide again by .98 for 2 stage gearbox or .97 for 3 stage gearbox to suit the number of stages (i.e. 1% loss per stage).
    Select the next motor size up, making sure yoy have about 10% excess power. If you have a multiple drive it is not easy in practice to share the power, so allow a further 10%

    Good luck
    Graham Spriggs
    LSL Tekpro
    Graham Spriggs

  6. Dear Mr. Chafekar,
    it is not just so easy to divide by 0.97 for a fluid coupling. This gravely depends on the actual coupling size in combination with effective power. Also there is an influence of manufacturer of fluid coupling.
    The slip of a coupling could vary from 2 to 6 %.

    If you could e-mail detailed project data I will let you know more acurate data.

    For gear box I agree to approx. 1% loss per stage assuming good conditions (clean oil, ambient temperature not too low...).

    For installed power you also have to take into account possible overload conditions. Then a 10 to 20 % increase is correct.
    Stephan Obser
    Voith Turbo GmbH & Co. KG
    Start-Up Components
    Fill-Controlled Couplings

  7. #7

    Belt Drive Efficiency

    I note that Mr. Spriggs' reply and Mr. Obser's differ only by the efficiency attributed to the fluid coupling. I agree with Mr. Spriggs. While acknowledging Mr. Obser's point that slip at the fluid coupling can vary from 2 to 6%, if you are giving up much more than 3% to coninuous coupling slip then you should probably choose another soft start or load sharing method.

    Joseph A. Dos Santos
    Dos Santos International
    531 Roselane St NW
    Suite 810
    Marietta, GA 30060
    Tel: 1 770 423 9895
    Fax 1 866 473 2252
    Email: jds@
    Web Site:

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