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Let’s say I want two motors in parallel in a circuit (so they get the same Voltage), and wanted one motor to spin anti-clockwise and the other clockwise- is it possible?

I thought by flipping one of the motors polarity, it would?

I want both motors to project a ball the same way, like a tennis ball launcher

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    $\begingroup$ Yes.............. $\endgroup$
    – DKNguyen
    Commented Nov 2, 2021 at 13:31
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    $\begingroup$ The devil is in the details, but yes. Details: DC, AC, Stepper, BLDC, three-phase. $\endgroup$ Commented Nov 2, 2021 at 13:52
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    $\begingroup$ Mount one on the left and one on the right of the gear they drive. $\endgroup$
    – Solar Mike
    Commented Nov 2, 2021 at 13:57
  • $\begingroup$ Hi, so I want them to both effectively project something the same direction like a tennis ball launcher $\endgroup$
    – Herbert
    Commented Nov 2, 2021 at 14:21
  • $\begingroup$ what does that mean? ... what mechanism is used to project an object? $\endgroup$
    – jsotola
    Commented Nov 2, 2021 at 14:56

2 Answers 2

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Assuming the motors are 'simple' DC motors, then yes, reversing the polarity on one of them will generally reverse the direction of rotation.

Any other type of motor (AC, etc.) probably won't work this way.

If you're building a 'tennis ball launcher' like device you can get the same effect by simply physically mounting the motors so they spin in opposite directions (ie, rotate one so the two motor shafts are still parallel but facing each other/pointing in opposite directions).

If you give more information about the particular motor you'll probably get a better answer...

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  • $\begingroup$ AC normal induction motors definitely spin backwards if you wire them backwards $\endgroup$
    – Tiger Guy
    Commented Nov 2, 2021 at 16:23
  • $\begingroup$ @TigerGuy I didn't want to run down all of the possibilities, just point out that anything other than a 'simple' DC motor is problematic. $\endgroup$
    – BobT
    Commented Nov 2, 2021 at 16:26
  • $\begingroup$ Hi, I was thinking of using DC motors. Only thing is, i don’t have enough room if I place one of them like that- so I thought that would have to try get one to spin anti-clockwise then instead of re mounting it? Would it be okay if I put them both parallel to each other in the circuit and one flipped around so that it’s plus and minus flip please and then would one spin the other way please? $\endgroup$
    – Herbert
    Commented Nov 2, 2021 at 19:46
  • $\begingroup$ @Herbert As this answer clearly states, if you are using DC motors then you should be able to reverse direction by reversing polarity. $\endgroup$
    – Eric S
    Commented Nov 2, 2021 at 23:48
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I think you could reverse both polarity of Motor OR battery on that circuit Herbert- but reversing polarity of battery though it will reverse both motors- not just one!

That’s saying it’s two motors in parallel with power source

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