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More current to stepper motor

Discussion in 'Sensors and Actuators' started by rj23, Jul 20, 2020.

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  1. rj23

    rj23

    7
    1
    Jul 20, 2020
    Hi all,

    Bit of an odd one.
    I have an aftermarket car ecu that has a 4 wire stepper motor attached to it.
    Unfortunately, the ecu is current limiting to 1 amp.

    The motor needs 1.85 amps (6.5 ohm motor, 12volts).

    It therefore needs a bigger current supply (no position feedback needed).

    Is anything available (make or otherwise) where the 4 inputs can be connected, and the higher current can be output?

    thanks

    Rod
     
    siemthanh5 likes this.
  2. Bluejets

    Bluejets

    4,090
    857
    Oct 5, 2014
    Show a schematic of your installation.
     
  3. rj23

    rj23

    7
    1
    Jul 20, 2020
    upload_2020-7-20_17-24-51.png
     
  4. rj23

    rj23

    7
    1
    Jul 20, 2020
    upload_2020-7-20_17-26-18.png
     
  5. Bluejets

    Bluejets

    4,090
    857
    Oct 5, 2014
    Block diagrams do not help much.

    If you can gain access to the step direction signals ( which I doubt) then you could use just about any driver.
    Why you need to drive at a higher current is a mystery though.
     
  6. rj23

    rj23

    7
    1
    Jul 20, 2020
    The motor and the ECU are from different automotive applications. The rated supply of the ecu is insufficient to drive the motor in the other assembly.
     
  7. Alec_t

    Alec_t

    2,843
    760
    Jul 7, 2015
    You could use the ecu to control power MOSFETs to switch the stepper motor. The devil will be in the details.
     
  8. rj23

    rj23

    7
    1
    Jul 20, 2020
    I like your thinking.
     
    Last edited: Jul 20, 2020
  9. bertus

    bertus Moderator

    745
    264
    Nov 8, 2019
    Hello,

    @01sporty , The L298 is not going to work.
    It can deliver 2 A per channel, but total device current is 4 A.

    Bertus
     

    Attached Files:

  10. Minder

    Minder

    2,966
    626
    Apr 24, 2015
    You also require some means of ensuring the winding current is a constant 1.85amps at all speeds.
    M..
     
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