Why does dc motor not work when put in wireless doorbell ringer circuit?

I wanted to mod a wireless doorbell ringer to instead have a 3DCV motor operate when the remote controlled switch activates. to do this, I took out the speaker that was in the doorbell receiver end, and hooked up the motor there. Before I replaced the speaker with the motor, I used a voltmeter to test the voltage going through the circuit, and it read 3.7. Well actually it goes up to a max of 3.7, stays there for a while, then goes back down to zero. But the motor doesn’t turn, it instead actually makes a fainter sound that the speaker originally made when the switch is pressed.

Could someone explain this to me? I think that the speaker used AC voltage, and the motor used dc, but I don’t know how to check.

Any explanations and quick fixes are appreciated!
@AJ The motor doesn’t even oscillate though, it just makes a buzzing sound that sounds familiar to the speaker chime…yet 3.7 should be more than enough…guess I’ll try that rectifier idea anyways

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