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In DC-biased sinusoidal current vernier reluctance machines (DC-biased-VRMs), the DC exciting winding and AC armature winding are integrated into one single winding. Therefore, the copper loss can be reduced with torque density increasing, and only one set of power electronic converter is demanded. This paper is to propose a DC-biased-VRMs drive with asymmetrical power electronics devices and corresponding...
Due to the current constraint of linear induction machine (LIM) and voltage constraint of inverter, the output thrust of LIM is limited. So, in order to make LIM output thrust as large as possible within current and voltage limit, firstly, the maximum thrust per ampere (MTPA) is used to achieve maximum thrust with limited current in low speed. Secondly, with the speed of LIM increasing, the voltage...
On the basis of establishing mathematical model of induction machine, the simplifying assumption of two-dimensional plane finite element model was proposed, and Dirichlet and main boundary conditions were defined. The speed governing of induction machine was realized using back-to-back voltage-fed frequency converter. The continuous output direct voltage value of three-phase non-controlled rectifier...
In this paper a Model Predictive Control (MPC) was applied to the flux and torque control of a Synchronous Reluctance Motor, SynRM. The behavior of the controller was analyzed based on model's simulations performed in Matlab/Simulink Software. From the results, it was verified that the controller has good performance. The SynRM can reach the speed reference value controlling simultaneously flux and...
The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback...
The presented DTC-3V-3L method was designed to ensure the high performance of PMSM drive. Using the predictive approach the algorithm minimizes torque ripples, ensures constant switching frequency and DC link voltage balancing. Moreover, it also provides the fastest dynamic torque response, similar to the fastest non-linear methods.
Medium voltage permanent magnet synchronous motor (PMSM) driven subsea pumps have the potential to improve system efficiency and reliability to lower the operating costs, and reduce the subsea pump module (PM) weight and size. These subsea pumps can be deployed in the well, in a dummy well or on the mudline in a skidded configuration. The higher speeds achieved by such motors, compared to the same...
A fault of the coils or the inverter of a permanent magnet synchronous machine (PMSM) can yield a potentially dangerous behavior. To allow for an operation even in this case, PMSM constructions with redundant stator coils and inverter legs have been proposed in literature. This paper describes a method to systematically determine optimal coil currents for the torque control in the case of an open...
This paper proposes a highly improvised and a vibrant sensorless vector control of the three-phase induction motor drive, brought out by a combination of sliding mode control and Space vector pulse width modulated inverter, with “Direct synthesis from State Equations” (DSS) as the technique for estimating speed. Field oriented Vector control method of decoupling the flux and torque and controlling...
This paper presents a performance comparison of feedback linearization and field oriented control for a synchronous reluctance machine. In order to represent realistic drive performance and dynamics, look-up tables of the machine inductances as a function of currents are used to include saturation effect. Additionally, a trained neural network was implemented to take the nonlinear behavior of the...
This paper presents a fault tolerant control proposal for a single Open Phase Fault (OPF) in a three-phase Permanent Magnet Synchronous Motor (PMSM). The mathematical model of the motor under open single phase is presented and its disturb to current, flux and torque are evaluated. The presented method is based on the Finite Control Set Model Based Predictive Control (FCS-MPC), and it is compared to...
This work represent induction motor modeling from its dynamic equations. The switching table base DTC(ST- DTC) is implemented to the dynamic machine model for 2 level and 3-level voltage source inverter. Out of 27 switching vectors of 3-level inverter, 12 active vectors are used for simulation of DTC with 12 sectors. For reduction of torque ripple a five level torque comparator is proposed. A comparison...
Recent evolution in power electronics and semiconductor switching devices has paved the way for amelioration of various power electronic systems. Hence, various multilevel inverter configurations have been put forward with reduced device count and increased output levels. Pulses with modulated (PWM) adjustable speed drives are employed in various industrial drive applications to achieve superior performance...
The polyphase induction motor is the most widely used ac motor because of its numerous advantages like low in cost, simple & rugged construction, absence of commutator and good operation. In the recent past Multilevel inverter technology has emerged as very important alternative in the area of high power, medium voltage control. By using these inverters we can change the frequency levels of induction...
Variable switching frequency and regulating the dq-axes current of the motor with noticeable ripples are of the problems pertaining to finite control set model predictive control (FCS-MPC) of a motor drive. In this paper a novel method has been developed to modulate the selected voltage vector of the FCS-MPC method. This method first choses the voltage vectors that should be applied to the motor in...
In the high-speed permanent magnet synchronous motor(HS-PMSM) driver system, the current sampling is not accurate enough to support the calculation of complicated algorithm (vector control, direct torque control, etc.) since the current varies significantly in a single pulse-width modulation (PWM) period because of the small parameter of the HS-PMSM due to the high speed design. In this article a...
Due to the superior dynamic performance of the field oriented control technique, Induction Motors (IM) are the workhorses of industries. Core Loss (CL) and Stray Load Loss (SLL) are generally neglected in developing of the mathematical model of IM. But they should be considered in the mathematical model of IM from a viewpoint of precise control of speed and torque. Though PI based control strategy...
This paper proposes a transformation matrix to generate Pulse Width Modulation (PWM) signals for Four Switch Three Phase Inverter (FSTPI) using vector control. The feasibility of the control strategy is verified by proving the power invariance before and after the transformation. Simulation and experimental results have verified the validity and effectiveness of the proposed method to obtain instantaneous...
This paper proposes a direct model predictive control (MPC) strategy to control the bidirectional quasi-Z-source inverter (BqZSI) driving a permanent magnet synchronous machine (PMSM) for electric vehicle applications. The dq machine currents are simultaneously controlled with the capacitor voltage and inductor current of the dc side. The physical model of the BqZSI with PMSM is first derived which...
This work presents the results of integrating a Fuzzy Logic controller instead of a classic PI controller in an IFOC speed regulation scheme dedicated for a 3 phased asynchronous moto-pump type Ebara Pra-50. A comparative study between the two different techniques is presented where a simulations by simulating the developed model of the studied system under Matlab-Simulink environment. The obtained...
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