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Sensorless control of permanent-magnet synchronous machines (PMSMs) at low speed and standstill is often based on a difference between q- and d-axis inductances. By determining the inductances, i.e., by evaluating current responses that result from the supply of voltage test vectors, an estimation of the rotor position is obtained. These inductances are dependent on the stator current-because of (cross-)saturation-and...
This paper presents employment of adaptive deadbeat current controllers in vector control scheme working in rotor flux coordinates. The parameter changes cause the deterioration of control performance in high precision AC induction motor drives. The adaptive controllers with online identification keep the performance on a high level. On-line identification gives the estimate of the motor parameters...
This paper presents the impact of the magnetic cross-saturation in a sensorless Direct Torque Control (DTC) scheme for Synchronous Reluctance Machines (SynRMs). Due to the rotor saliency of the SynRM, the angular position of its rotor can be estimated by using inductance variations due to geometrical effects. This technique can be used at low and zero speeds of operation. However, the influence of...
Biaxial excitation generator for automobile (BEGA) is proposed as a solution for integrated starter/alternator systems used in hybrid electric vehicles (HEVs). This paper demonstrates through experiments and simulations that BEGA has a very large constant power speed range (CPSR), theoretically to infinite. A vector control structure is proposed for BEGA operation during motoring and generating, at...
In this paper outer rotor flux reversal machine (FRM) topology is proposed for rooftop wind generator application. The prototype design of 3-phase, 2.4 kW, 214 rpm, 50 Hz, 6/14 pole outer rotor FRM is presented. Finite element analysis is carried out to evaluate the self and mutual inductance, regulation and efficiency of the machine. Outer rotor and inner rotor configurations of FRM with same outer...
Flux-switching permanent magnet (FSPM) brushless machines have emerged as an attractive machine type by virtue of their high torque densities, simple and robust rotor structure and the fact that permanent magnets and coils are both located on the stator. Both 2D and 3D finite element analyses (FEA) are employed to compare the performance of a standard topology with three modular, fault-tolerant designs...
This paper examines the impact of the winding layer number (single- and double-layer), and magnet type (sintered and bonded), as well as slot/pole combinations on AC stator losses in surface permanent magnet (SPM) synchronous machines equipped with fractional-slot concentrated windings that are designed for wide speed ranges of constant-power operation. It is shown that the use of bonded magnets instead...
Flux-switching permanent-magnet (FSPM) brushless machines have attracted considerable interest as a candidate machine technology for applications requiring high torque density and robust rotors. To date, published findings have focused exclusively on single and three phase FSPM machines. This paper investigates FSPM brushless machines of higher phase numbers, by means a detailed comparison of the...
According to earlier work and papers by other authors, the main flux path of an induction machine is not only saturated due to the magnetizing current or, in other words, ldquothe magnetizing inductance can be modeled as a function of torquerdquo. In the paper a method is proposed to extend the induction machine's standard fundamental wave model taking into consideration the changes of the main inductance...
This paper introduces and develops a new operating diagram and parameter estimator for the synchronous reluctance machine, based on the machine equivalent vector model in the synchronous reference frame. The operating diagram demonstrates the machine main performance parameters, like torque, current, voltage, frequency, power factor and current angle, behavior all together in one graph. This diagram...
Due to their simplicity, robustness, high performances and reduced cost, the variable reluctance machines (VRM) occupy today a place of choice in the electromechanical conversion of energy. Hence the growing interest for the study and the design of a new structures more successful and better adapted to the new requirements. The purpose of this paper is to propose a useful and comprehensive design...
A dual mechanical port (DMP) machine is a new kind of machine with two rotors. Those in literature can be classified into independent field type, as the fact that there is no effective electromagnetic coupling between different parts in the machine. A new type of DMP machine is presented in this paper, which features as a unified field in the machine. This kind of machine can utilize d-axis current...
Discrete-switched reluctance machine (DSRM) drives represent a new class of reluctance machine in which stator phases are magnetically independent of each other. This machine type is very suitable for in-wheel propulsion applications such as those in the automotive area. Due to the absence of mutual coupling between windings there are many possible control strategies that may be employed for control,...
This paper describes a preliminary study of a 30 kW doubly-fed induction generator (DFIG) used for wind turbine applications. Wind represents a variable-speed intermittent source of energy in nature and can be controlled to be a nearly constant speed but variable-torque input to the wind turbine using blade pitch angle regulation. Wind profile at the installation site is investigated so as to derive...
This paper presents a comparison of two IPM - interior permanent brushless synchronous motor structures realized with the same stator geometry with two different rotor pole numbers. First analyzed motor has got stator with double layer winding with Q=12 slots and a rotor with 2p=8 poles. Second one, has got the similar stator with Q=12 slots and a rotor with 2p=10 poles. These two motors are analyzed...
Stepper motors are becoming to be very attractive transducers for conversion of an electric signal to a mechanical position. Due to its simple construction the reluctance machine is considered as a very reliable machine which practically not require any maintenance. The present paper proposes a mathematical analytical method of a calculus of a phase current and electromagnetic torque of the motor...
The paper presents novel sensorless method of rotor position detection without any mechanical sensor. Described method bases on inductance variations connected with poles position. The rotor position is obtained by applying one voltage pulse only. Efficiency of presented method has been confirmed by laboratory tests on axial flux permanent magnet motor. Moreover described method can be used to startup...
This paper deals with the identification of a new high power starter-alternator system, using both: a finite element method (FEM) modeling and an experimental vector control. The drive is composed of a synchronous 7-phase claw-pole machine supplied with a low voltage / high current voltage source inverter (VSI). This structure needs specific approaches to plan its electrical and mechanical behaviors...
The paper analyses the inductance saturation effects of an induction motor in order to be considered in the nonlinear control drive technique. The involved inductances are determined through finite element modeling of the induction machine. The impact of coupled field and circuit approach on the derived parameter variation has also been examined. The methodology is suitable for control techniques...
In this paper, on the base of comparing with switched reluctance motor (SRM), a new doubly salient permanent-magnet machine (DSPM) and its structure and running principle were introduced. Because of the high nonlinearities of the DSPM motor, the finite element method (FEM) was adopted to analyze the static characteristics under different armature currents and different thickness of permanent-magnet...
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