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In this paper, a rotor-flux-oriented control scheme for seven-phase induction motor drives is presented. At low speed the proposed control scheme is able to increase the motor torque by adding a third harmonic component to the air-gap magnetic field. Above the base speed the control system reduces the motor flux in such a way to ensure the maximum torque capability. The validity of the proposed control...
A new structure is set forth for the interior composite-rotor controllable-flux permanent magnet synchronous machine (PMSM). NdFeB permanent magnet(PM), which has high remanent flux density as well as high coercive force, and AlNiCo PM, which has high remanent flux density but low high coercive force, are used in this structure. The magnetization intensity and direction of AlNiCo PM can be controlled...
As a new type of induction machine, brushless doubly-fed machine (BDFM) has excellent speed regulation performance and can run in the condition of variable-speed-constant-frequency power generation. It has good applicable potentials on energy-saving-speed-adjusting motors and wind power generation system, but its structure and operating principle are more complex. To study the effect of different...
The equivalent T circuit of an induction motor is found in every engineering motors book and is becoming increasingly important with the popularity of vector control. The values used in the circuit are used to dictate the necessary gating signals for the pwm inverter. It is the de facto standard bridge between the field analyst and the motor controller. These parameters are not unique. Force, energy,...
In vector controlled induction motor drives, to optimally select the stator or rotor flux reference, in field weakening region, it is necessary to take into consideration also the machine magnetizing curve. The paper proposes a methodology for the identification of the magnetizing curve that can be applied at standstill. The approach consists on applying to the stator windings a suitable mono-phase...
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