I tried with 2N3904 but the voltage in the motor is at 0.7V, and isn't enough for run it 
I used a resistor with 220Ohm and others values, but nothing changed. I set the PWM first to 52 then to 120, but nothing append.
I need to add something or remove something and where in the circuit?
I'm very noob in electronics, I don't need change of direction or others complicated things, I need only to control the speed of this simple motor, in the simplest way.