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Multi-phase ac motor drives are nowadays considered for various applications, due to numerous advantages that they offer when compared to their three-phase counterparts. Variable speed induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. This paper analyses operation of a Model Reference Adaptive System (MRAS)-based sensorless...
A novel control method is proposed in this paper, namely six-phase motor trapezoidal wave phase current control. By using the trapezoidal phase current waveform, the stator winding is separated into the field winding and the torque winding. The function which is about the field and torque control in directed and separated mode can be realized without the complex Park transformation. The airgap field...
In an increasing number of applications highly dynamic electrical drives, characterized by high quality torque control, are demanded. Direct torque control (DTC) for AC machines, permanent magnet synchronous motors (PMSM) or induction machines, can provide this accurate and fast torque control. When applying DTC the change of the stator flux linkage vector is controlled, based on torque and flux errors...
This paper presents a new simple overmodulation strategy in direct torque control (DTC) of induction machines. The strategy increases the inverter voltage limit and therefore extends the constant torque region. The minor modification on the conventional flux weakening method is also introduced to improve the torque capability in the field weakening region and hence improving the operation over a wide...
In this paper a nonlinear controller is presented for Doubly-Fed Induction Machine (DFIM) drives. The nonlinear controller is designed based on input-output feedback linearization control technique, using the fifth order model of induction machine in fixed stator d ,q axis reference frames with stator currents and rotor flux components as state variables. The nonlinear controller can perfectly track...
In this paper, a novel control method for a six-phase induction machine with nearly square air-gap flux density is proposed and evaluated. In this method, the stator phase windings alternately act as either flux- or torque-producing phases. In this way, the flux and the torque of the induction machine are directly controlled with no vector transformation used. Theoretical and finite-element analyses...
The common characteristic of all direct torque control drives is the manipulation of stator flux by means of the application of an adequate stator voltage. In this work this concept is extended to the pulse width modulated of the correct stator voltage to achieve stator flux regulation and tracking of commanded torque. The strategy is based on a few simplified machine equations based on the principle...
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