Abstract：For internal feedback motors, a control system is designed, in which a chopper circuit is developed for speed regulation based on the rectifier-inverter principle and corresponding formulas. The voltage control instructions in dq rotating reference frame are generated by changing the voltage in 3-phase static reference into 2-phase rotating reference with PARK transformation combined with the forward feedback decoupling control strategy. A unity power factor operation can be achieved by setting the current of the q axis(reactive current)to be 0. The SVPWM controller generates a driving signal according to the phase and amplitude of voltage and current stator as well as sampling control voltage. By controlling the IGBT on or off, the excess energy is delivered to the stator. The control system is simulated in MATLAB and the results show that with the decrease of duty ratio, the speed and active power reduce, and the reactive power remains zero, suggesting the internal feedback motor is subject to a higher power factor during speed regulating. Finally, the electric bill of a pumping station in Jiangsu Province is calculated when the internal feedback motors are used to drive the pumps for a year. It is shown that a ￥413 100 budget can be saved after the motors are used, causing significant economic benefits.
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