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Back emf?

Discussion in 'Troubleshooting and Repair' started by Shaggy74, Jul 1, 2018.

  1. Shaggy74

    Shaggy74

    5
    0
    Nov 14, 2017
    Hi, I have constructed the circuit shown below, I am using a 9v battery as the power supply, when the motor is running the battery gets extremely hot, how can I prevent this from happening please? Any help will be gratefully appreciated
     

    Attached Files:

  2. duke37

    duke37

    5,213
    718
    Jan 9, 2011
    Use a more powerful battery.
    Reduce the load.

    Some information on the battery type and load current would be helpful. Does it work?
     
    davenn likes this.
  3. Alec_t

    Alec_t

    2,663
    702
    Jul 7, 2015
    The motor should have a back-emf protection power diode in parallel.
     
    Shaggy74 likes this.
  4. Shaggy74

    Shaggy74

    5
    0
    Nov 14, 2017
    Thank you very much Alec_t for your advice, what sized diode would be best to use?
    Thanks again
    Mark
     
  5. Alec_t

    Alec_t

    2,663
    702
    Jul 7, 2015
    The diode should have a current rating similar to the peak current that the motor draws.
     
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