What type of motor is this?

Discussion in 'Electronics Resources' started by cebrax, Apr 25, 2010.

  1. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    Hello!

    I have a motor that has a sticker behind it says

    DC12V
    MMA-6P2RAP
    Japan
    28May91NB

    It has 4 pads on it on a small pcb. Two of them are - and +.
    Others has no identifier.
    When I give voltage to + and - leads, the motor turns, and I can control it by pwm.
    I measure the voltage on the other terminals and they give 2 V with 5% pwm and 0.707 V with 100% pwm(5V). But the voltage is not stable, and has big hops.
    And unfortunately I don't have an oscilloscope.
    Any idea?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The DC12V gives the operating voltage. Those leads with the erratic (to a meter) output might be for a tachometer function. You would need an oscilloscope to see the output properly.
     
  3. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    my voltmeter's frequency reading give nothing :(
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    A search on the numbers MMA-6P2RAP turns up only this thread. You can always use it as a 12 volt motor and ignore the mystery terminals.
     
  5. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    bump :)

    Well, can it be the field or something like that? If it is, how can I make use of them?
     
  6. rvh002@gmail.com

    Active Member

    May 15, 2009
    118
    2
    It could be a stepper motor. Try the manufacturers of stepper motors.
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    760
    picture dude...........what else is a better way.
     
  8. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    Last edited: May 3, 2010
  9. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Hey. I have seen that in old tape decks. if so this ain't a stepper
    where did salvaged it.
     
  10. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Could've been in a reel-to-reel tape deck or a phonograph (record player).

    The logo on it looks like Mitsubishi's.
     
  11. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    My friend bought it to me and yes, he says that he saw motors like this in an old tape something(player or recorder, i dont know, he doesnt remember).

    So how can I make use of these other two terminals? Any ideas? Trial-Error steps?
     
  12. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    That motor is simple to operate.
    You give 12V to ± inputs.
    The other two are High and Low, they are used for high speed recording modes.
    With 12 V applied you have to give another voltage to either H or L.
    U can use a 470 Ω 0.5W resistor from 12V to H or L.
    Low will give a low rpm and H a high rpm.
    I hope you did not damage the motor by jumping voltages between the pins. :D
     
  13. cebrax

    Thread Starter Member

    Jan 30, 2010
    26
    0
    I became really mad and I did jumped the voltages among everything :)

    Anyways, thanks :)
     
  14. sam1sudha

    New Member

    Oct 22, 2009
    2
    0
    THat could be a bipolar stepper motor , which normally comes with 4 wires!
    Check the continuity b/w 4 wires.
     
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