Devices, systems, and methods reduce levels of pro-inflammatory or anti-inflammatory stimulators or mediators in blood by selective adsorption. The methods and systems of the present invention modify the original hydraulic fluid circuits of the automotive transmission provided by the automobile manufacturer to adjust the feel or firmness of upshifts of the transmission perceived by drivers and occupants of vehicles having the modified transmissions. The concave and convex portions are formed on a borderline between a compressive region of the stator core at an inner diameter side thereof and a tensile region of the stator core at an outer diameter side thereof. In some embodiments, when the motor is operating below a given threshold, fixed-width PWM pulses are applied to subsequent revolutions of the rotor instead of phase-advanced PWM pulses.