L298 and Stepper Motor Getting HOT..

Discussion in 'Embedded Systems and Microcontrollers' started by gne_577, Aug 20, 2015.

  1. gne_577

    Thread Starter New Member

    Jul 17, 2015
    2
    0
    Hello everyone.!
    I'm making stepper motor control project with L297 and two L298 for stepper motor rated 2Amp capacity.These are parameter for L297

    Reset pin 20 = 1 (+5V)
    Pin 16 Osc = recommended circuit used as per datasheet
    Pin 15 Vref = 0.36 V
    Pin 11 Control = 1
    Pin 10 Enable = 1
    Current sensing resistor = 0.5 ohm ( 1 Ohm resistance 1 watt parallel )

    Power Supply = 12 V , 2.1 Ampere
    Motor Running = 1 Ampere ( By adjusting vref and sense resistor )

    Now the motor is running very well forward and reverse.But I need Locking state in which rotor remains lock according to my application.

    Now the problem is that after few minutes the motor getting very hot and L298 both near about to burn. I don,t know exactly what to do now..

    Thanks in advance..
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    What's the stall current on your motor?

    You will likely need to add some heatsinks.

    what exactly does this mean? The motor will have a rated stall current which you need to be able to supply, or find a new motor.
     
    gne_577 likes this.
  3. JohnInTX

    Moderator

    Jun 26, 2012
    2,345
    1,028
    The controllers I've used/designed reduce the coil current substantially in the 'locked' or idle state.
    You might consider dynamic locking by removing the drive and shorting the motor coils.
     
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  4. gne_577

    Thread Starter New Member

    Jul 17, 2015
    2
    0
    @ Johnnln TX: sir is this possible with any electronic circuit..?
    Please tell me circuit or component where i can switch the motor points are short immediately after its workdone.

    Tonnes of thanks :)
     
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