Help with problems running motor via usb plug... motor not getting enough power.
I'm trying to connect a small 1.5VDC up to 6VDC motor in series or parallel to three pager vibrators .5V to 3VDC and two LED lights connected in parallel to be powered by a usb plug. For some reason, the small 1.5VDC up to 6VDC motor doesn't seem to be working. I tried connecting power directly to this motor and it still would not turn. I thought the motor was burned out, so I tried to swap it with an three identical new motors and couldn't get any of them to run. The pager vibrators and LED light up when connected to motor in series but not in parallel. The larger motor however still does not seem to be getting enough power to turn. I previously had the motor running on a single AA battery and can't figure out why it is not getting enough power with the five volt usb power. I also have a small potentiometer hooked into the circuit to make the motors variable. I set it to pass the full power through the circuit. Is it necessary to add more power to this motor? Also, is there a way to add power to this motor without risking sending too much voltage to USB via a battery? I am a novice at electronics.
Note: Adding power with a battery would be ok... but it must turn on and off motors by power turning on and off of USB.