I think there is some kind of control. When I turn on at the lowest speed possible, 2000 RPM, if I hold the shaft before it begins to rotate it does something like ... Kicks.... It turns on and off and doesn't rotate at all... If I release it, it begins to spin, and even at this lower setting ( it spins till 40000 RPM), I can't stop it anymore just by grabbing it. Or this ... kicks... are just that the motor is not being able to begin to spin at all, nothing related to current control?
If I control the pwm cycle by turning on to some speed and then off, with some small delay, would this performed in repetition at least give the effect of loosing torque?