Because English cannot understand it, I use an interpreter.
I cannot express it definitely.


By my experience, there is the case that objective torque does not come out by the rule electric current depending on the form of the driver IC in the case of the uni-polar motor.
There is the case that an electric current spreads in the reverse aspect from a theory.
When I called the driver IC maker, and it heard it, it was an answer to say to an electric current of the about √ double when I set it.
I am careful to temperature rises (less than 80 degrees C), and please increase electric currents slowly.
The temperature reaches equilibrium about 2 hours later.
When a motor is installed to a metal frame, radiation of heat is simpleness.
When a sound changed suddenly, the motor has magnetic saturation をの possibility and cannot expect more than it.
A loss by the contents of this sentence is responsibility of your own. （I do not guarantee it）