1. Do not share user accounts! Any account that is shared by another person will be blocked and closed. This means: we will close not only the account that is shared, but also the main account of the user who uses another person's account. We have the ability to detect account sharing, so please do not try to cheat the system. This action will take place on 04/18/2023. Read all forum rules.
    Dismiss Notice
  2. For downloading SimTools plugins you need a Download Package. Get it with virtual coins that you receive for forum activity or Buy Download Package - We have a zero Spam tolerance so read our forum rules first.

    Buy Now a Download Plan!
  3. Do not try to cheat our system and do not post an unnecessary amount of useless posts only to earn credits here. We have a zero spam tolerance policy and this will cause a ban of your user account. Otherwise we wish you a pleasant stay here! Read the forum rules
  4. We have a few rules which you need to read and accept before posting anything here! Following these rules will keep the forum clean and your stay pleasant. Do not follow these rules can lead to permanent exclusion from this website: Read the forum rules.
    Are you a company? Read our company rules
Shared accounts will be removed Plugin Downloads Zero spam policy Forum Rules

How to Calculate Motor Torque?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Eliseu, May 23, 2020.

  1. Eliseu

    Eliseu New Member

    Joined:
    Dec 28, 2017
    Messages:
    23
    Location:
    Portugal
    Balance:
    129Coins
    Ratings:
    +4 / 0 / -0
    How to know the Motor Torque output?

    upload_2020-5-23_19-56-43.png

    IMG_20200429_160159.jpg IMG_20200429_160352.jpg
    Eliseu, May 23, 2020
    #1
  2. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    you cant - but you can measure it - use a set of scales and a arm attached to the motor
    Gadget999, May 23, 2020
    #2
  3. adgun

    adgun Active Member

    Joined:
    Jan 28, 2008
    Messages:
    493
    Occupation:
    mechanic
    Location:
    Netherlands
    Balance:
    5,541Coins
    Ratings:
    +131 / 3 / -0
    He can
    One watt is one newton with a speed of one meter a second, and you can make NM from it.
    Calculate rpm to meter/second, with a 1 meter lever
    above one meter a second devide it with motor watage, below one meter a second multiply it
    This gives motor torque multiply it with gearbox ratio and take gearbox efficienty
    a 25 ratio wormgearbox got a 70% efficentie
    regards Ad
    adgun, May 24, 2020
    #3
  4. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,897
    Location:
    London
    Balance:
    11,610Coins
    Ratings:
    +458 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    You dont know how many turns theee are in the armature and the diameter of the armature

    I have tested 2 x 400w motors one of them needed 10 amp to lift a load and the other needed 18 amps to do the same weight.

    Best to use the manufacturer stall torque if you can find it
    Gadget999, May 24, 2020
    #4
  5. adgun

    adgun Active Member

    Joined:
    Jan 28, 2008
    Messages:
    493
    Occupation:
    mechanic
    Location:
    Netherlands
    Balance:
    5,541Coins
    Ratings:
    +131 / 3 / -0
    the motor label gives 1/4 HP and 1750 rpm you dont need more
    adgun, May 24, 2020
    #5
  6. Eliseu

    Eliseu New Member

    Joined:
    Dec 28, 2017
    Messages:
    23
    Location:
    Portugal
    Balance:
    129Coins
    Ratings:
    +4 / 0 / -0

    @adgun Do you confirm the following values?

    [​IMG] [​IMG]

    Motor:
    HP: 1/4
    rpm: 1750 r/min
    η = 72%

    Gear:
    i=25

    -------------------------------

    ω= rpm.2.π/60
    Pout=Pin.η

    1 hp = 745.699872 W
    1/4= 186,5W

    Pout=Pin.η
    Pout= 186.5*0.72=134.226W

    ω= rpm.2.π/60
    ω= 1750.2.π/60 =183rad/s

    Pout=T.ω
    Tmotor=Pout/ω
    Tmotor=134.226/183 = 0.733Nm

    Tgearmotor= Tmotor. i
    Tgearmotor=0.733*25= 18.33Nm

    Tgearmotor= 18.33Nm
    Eliseu, May 25, 2020
    #6
  7. adgun

    adgun Active Member

    Joined:
    Jan 28, 2008
    Messages:
    493
    Occupation:
    mechanic
    Location:
    Netherlands
    Balance:
    5,541Coins
    Ratings:
    +131 / 3 / -0
    motor 186.5 watt/rpm 1750 gearbox ratio 25 gearbox eff 70%
    1750/25\=70rpm /60\=1.1666 rounds second
    1.166x2xpi=7.33 meter second
    186.5/7.33\=25.44NMx70%=17.81NM
    • Like Like x 1
    adgun, May 26, 2020
    #7
  8. Eliseu

    Eliseu New Member

    Joined:
    Dec 28, 2017
    Messages:
    23
    Location:
    Portugal
    Balance:
    129Coins
    Ratings:
    +4 / 0 / -0
    Thanks to validate the logic...
    The efficiency is 72%...
    Eliseu, May 26, 2020
    #8
  9. adgun

    adgun Active Member

    Joined:
    Jan 28, 2008
    Messages:
    493
    Occupation:
    mechanic
    Location:
    Netherlands
    Balance:
    5,541Coins
    Ratings:
    +131 / 3 / -0
    You must have gearbox eff. not motor eff.
    The motor delivers 1/4 hp but ask more current doing that.
    Wormgearboxes with a 25 ratio are about 70% with smal brand differinces
    sorry for the bad english
    regards Ad
    • Like Like x 1
    adgun, May 26, 2020
    #9