Current requirements of small motor?

Discussion in 'General Electronics Chat' started by spinnaker, Feb 26, 2012.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
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    I have an old battery operated mattress inhalator pump. Here is a link to the new updated version:

    http://www.campingcomfortably.com/coleman-rechargeable-quickpump.html

    The pump has stopped working. The battery seems to be charged but does not run the motor and battery voltage goes to zero volts when I hook the motor to the battery.

    So I hooked the motor to my homemade PSU. The motor ran. I could see the voltage start to drop (which is I am assuming the regulator going into thermal shutdown) and the 1.5A fuse blew.

    So I am guessing the motor is requiring somewhere over 1.5A.

    Now since the battery is old and worse the charger lacked any kind of charge controller, the battery is probably bad but I am curious why this motor is requiring so much current to run. Is this normal or do I just have a bad motor?
     
  2. jimkeith

    Active Member

    Oct 26, 2011
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    My guess is that the motor is OK--since it took a while to blow the fuse, the current is probably around 2.5A--sounds reasonable to me
     
  3. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
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    Thanks Jim.

    Looks like it might be just a bad battery then. As expected, as expected, it being so old.

    Instead of investing in a new battery and replacing it again a few years from now, I might just invest in a new AC only air pump.
     
  4. jimkeith

    Active Member

    Oct 26, 2011
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    I got a large double action hand pump for blowing up kiddie swimming pools (4") cylinder--really pumps lots of air
     
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