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Consideration of the structure and the operation principle of Switched Reluctance Motor (SRM), it is possible to obtain super high speed drive. Therefore, a three-phase 6/2 SRM, the speed of which is 130,000 rpm, is adopted for super high speed drive. Based on the two-dimensional finite element method (FEM), the torque-angle characteristics of 6/2 SRM are analyzed and the motor structure is improved...
This paper proposes a novel control method that uses current harmonics to minimize torque ripple for permanent magnet synchronous motor (PMSM) applied to electric power steering (EPS) system. In the EPS system, PMSM is accompanied by magnetic saturation of iron core due to high power and limited space. Partial magnetic saturation in the stator teeth results in significant torque ripple. In order to...
In this paper, a mathematical model of single side linear induction motor(SLIM) considering dynamic end effects is presented, the field oriented control(FOC) is implemented in which the end effect is compensated and the dynamic response is improved. A loss model of SLIM to consider the influence of primary leakage inductance is developed, in which the iron loss resistance is paralleled with primary...
This paper presents a coupling scheme of level set method(LSM) and finite element method(FEM) to analyze the dynamic performance of electromagnet with moving parts. Remesh process is necessary to analyze the dynamics of moving object using standard FEM. To reduce remesh process, LSM is coupled with FEM. LSM is useful for analysis of moving objects or propagating models depending on both time and space...
When BLDC drive mode is used to drive PM-AC motors, the influence of the transient current cannot be neglected, especially during high speed operation. In this paper, this influence to the BLDC drive mode is analyzed, and an analytic model for describing the transient current to the commutation angle and copper loss is presented. A method to determine the optimal commutation angle of the BLDC mode...
The paper deals with permanent magnet brushless motors designed for automotive applications. The presented motors are used in automated manual transmission (AMT) and twin-clutch systems. In the paper there are summarized requirements for electric motors in such systems. Next, the different configurations (different number of slots/poles, rotorpsilas types) are compared. The advantages and drawbacks...
This paper presents the result of the two-dimensional finite element analysis on the effects of rotor pole arc variation and number of teeth per rotor pole with different teeth depths and stator excitation pattern on various performance parameters like cogging torque, developed torque, harmonic torques, torque ripple and phase inductance for an 6/8, three phase flux reversal motor. A novel excitation...
In this paper, conventional PI controller, sliding mode controller (SMC) and fuzzy logic controller (FLC) for rotor field oriented controlled (RFOC) induction motor drives are studied comparatively. PI is simple but sensitive to parameter variations. SMC provides strong robustness to parameters variations, disturbance rejection and system order reduction. FLC does not need exact system mathematical...
This paper describes a compound-structure permanent-magnet synchronous machine (CS-PMSM) system used for hybrid electric vehicles (HEVs). It enables the vehiclepsilas internal combustion engine (ICE) to run at its optimum working points regarding efficiency, almost independently of the changing load requirement at the wheels, thus improving fuel economy and reducing emissions. The key part CS-PMSM...
The implementation of concentrated windings in interior permanent magnet (IPM) machines has numerous advantages over distributed windings, with the disadvantage being mainly the decrease in saliency ratio. This paper presents a proposed finite element (FE) method in which the d- and q-axis inductances (Ld and Lq) of the IPM machine with fractional-slot concentrated windings can be accurately determined...
This paper is introducing a fast Matlab toolbox to analysis the transient behavior of three-phase electrical machinery (EM). The well known models with several differential equations of voltage and current in rotor reference frame along with the torque and speed equations is used in matrix form to model the EM such synchronous machine, induction machine and DC machine. In order to fast simulation...
Switched reluctance motors are often running in status of two phases excited simultaneously. Mutual coupling has effects on not only the flux distribution and magnetic saturation, but also the ability of torque output. The two adjacent phases of switched reluctance motor can be excited in two modes, the long-flux-path mode and short-flux-path mode. The calculation method of mutual inductance in two-phase...
This paper presents the improvement of dynamic characteristics in interior permanent magnet (IPM) type BLDC motor with notch. The notch is applied on the surface of the rotor to reduce the cogging torque and to improve dynamic characteristics. The current, inductance and torque of initial model and optimal model are analyzed by FEA. The validity of improved dynamic characteristics is confirmed.
PWM control and one pulse control methods are useful in SPSRM(single phase switched reluctance motor). PWM method has safety for the low speed range to control SRM. And one pulse control method is proper to operate on high speed range in SRM for good energy efficiency and a considering switch frequency. Because PWM method is more safety than one pulse method, conversion of those is best choice according...
In this paper a torque compensation technique for switched reluctance motor (SRM) is proposed. The conventional torque control with a simple current control loop usually causes large torque ripples and affects the speed response and overall performance of the drive system. The proposed torque compensation method is based on a torque estimation technique using the inductance profile and squared value...
This paper proposes a low-ripple instantaneous torque control method based on an adaptive torque sharing function for use with switched reluctance motor. The conventional torque sharing function technique is most effective when the SRM operates in low speed range and its performance deteriorates at higher speed. The proposed adaptive torque sharing function has the active period of each phase that...
This paper mainly discusses several methods on widening the speed-regulating range of rare earth permanent magnet brushless direct current motor (BLDCM). The simulation of traditional three-phase inverter structure and the three-phase bridge based on Buck chopper is analysis on the speed-regulating range. The calculation formulas of inductance and capacitance in Buck chopper are given. DSP is designed...
The model equivalent circuit is identified. From motor manufacturers test report, parameters Ra, and Xm are calculated. The rotor parameters X12, X1, X2 ,R1, R2 and stator parameter Xa are determined by using direct search optimization method. The starting and running performance values are calculated and compared with available values. From estimated parameters, the transient and sub-transient reactance...
It is well-known that buried permanent-magnet synchronous machines have inductances with high-order harmonics. These inductance variations are due to nonsinusoidal field distributions and lead to torque pulsations. In this paper, we use an observer to estimate these harmonics. The effectiveness of the proposed method is investigated through computer simulations, and experimental results highlight...
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