To improve the stepping motor torque-frequency characteristic,a kind of double voltage driving circuit with feedback control for stepping motor was designed and discussed.

This paper gives out the torque-frequency characteristic curve equation of stepping motor based on the basic power interface circuit of stepping motor, carries out computer simulation and proves its correctness in condition of no magnet saturation.

Software control realize the start-up characteristic of the driven film system of the high-speed camera;

To solve the problem,based on the processing of data acquired in the field,the function equation revealing the influence of oil-feeding quantity and bed height on the temperature increasing rate of the bed is proposed to analyze and calculate the main factors influencing the start-up characteristics of the DG410/9.

Not only the influences of the number of loops,charging rate,tilting angle and quantity of heat on the heat transfer performance but also the start-up characteristic of the pulsating heat pipe at horizontal heating and top-heating working conditions were studied and the flow pattern in the pipe was observed.

Starting characteristic of double-nozzle model in directly drained CW DF/HF chemical lasers;

Experimental study on starting characteristic of cascade refrigeration system

The normal starting characteristic and fault diagnosis function of the power chip VNH2SP30-E are studied and analyzed,and a detailed anti-pinch scheme for vehicle power window is proposed.

Theoretical investigation of the startup characteristics was conducted with the numerical method.