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Thread: drive a 4 to 20 amps dc motor

  1. #1

    Default drive a 4 to 20 amps dc motor

    How can I drive(Both speed and direction) a dc motor that draws current 3 amps to 20 amps
    I am currently using 2 relays, but not reliable
    I think MOSFET H bridge is a solution.
    Please help

    Thanks in advance

  2. #2

  3. #3

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    Thank you for your quick reply Vikas.
    I checked the page, but the cost is too much
    Super Hercules 36V, 30Amp Motor Driver
    Product ID: NR-MDR-S-HER-36V30A
    Weight: 110 gms
    Price: Rs.2,576.25
    Is there any schematic ?

    Actually I have developed a working prototype of remote controlled coconut tree harvesting robot. It consists of 8 DC motors
    Currently I am using Relays to drive these motors, but they are not reliable

    Thanks

  4. #4
    Administrator T-1000 vikas's Avatar
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    Then stick with relays ,Mosfets based solution will get expensive . B

    I can suggest something if you give more details like motor connection circuit, motor types .

    Photos would be nice tooo ...
    Vikas Patial

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    Do a search on "H bridge Mosfet" and you should be good.

    Check this out:
    http://www.onegentleman.biz/Hardware...%20Bridge.html

    Whatever Mosfets you use, ensure that the Rds value is below 50 milliohm if you are pushing upwards of 10A. IRF4905 and IRF3205 are good and available in India.
    --
    Mohit Mahajan,
    www.BioZen.co.in

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    Mosfets aren't too expensive these days. The p/n channel pair I noted above should be Rs. 80-100/pair depending on where you are. A 20A relay isn't going to be cheap either.
    --
    Mohit Mahajan,
    www.BioZen.co.in

  7. #7

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    Thank you very much Mohit Mahajan for your valuable information. I will try the circuit tomorrow.

  8. #8

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    Quote Originally Posted by vikas View Post
    Then stick with relays ,Mosfets based solution will get expensive . B

    I can suggest something if you give more details like motor connection circuit, motor types .

    Photos would be nice tooo ...
    Hi Vikas,
    But I have to drive 8 motors in the robot. Rs.2,576.25 per each motor costs Rs.20,610.00!!!!!!!!!!!
    I am using a 12VDC wiper motor like below

  9. #9
    Administrator T-1000 vikas's Avatar
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    From net i found

    http://www.alibaba.com/product-gs/21...per_Motor.html

    It is no where near 20 A but like 4A / 8 A stall current and 1.2 - 3 A running current.

    So i think the famous 5 A Hbrdige would do fine, Use two in parallel per motor if required.

    http://www.ikalogic.com/h_bridge.php

    Constructing the above h-bridge should be About Max Rs 100 / bridge .
    Vikas Patial

  10. #10

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    Thank you very much Vikas
    The schematic is simple and I will try it also

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