I have no idea what "speed{{1}}" is supposed to mean.
But anyway that circuit is a mess. Those are not logic level MOSFETs, they need a higher voltage than an Arduino can supply to switch on fully. They are connected the wrong way round, the drain should be positive and the source negative and an ammeter is not good enough for a load. You should definitely not have 100 ohm resistors from gate to ground, that will damage the Arduino PWM pins.
In fact I have trouble believing that a circuit connected like that does anything at all.
Steve