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This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
Axial flux machines (AFMs) are used in applications that require high power and torque densities in a pancake-type form factor. There are various types of AFMs based on the configuration of the rotor/stator and permanent magnet (PM) orientation. Most AFMs employ surface permanent magnet machines and as the result, the machine has low inductance and saliency. In this paper, an axial flux machine with...
Surface-mounted permanent magnet (SPM) machine is widely applied in industry application because of its high torque density, high efficiency and simple rotor structure. This study presents a parametric design plane, which makes the desired machine performance visualized during the machine design process. Based on that, a new parametric design method is introduced to simplify the design procedure of...
In order to reduce the permanent magnet (PM) volume and combine the advantages of in-wheel motor, a novel modular-stator outer-rotor flux-switching permanent-magnet motor (MSOR-FSPM) whose PM volume is half of that in conventional outer-rotor flux-switching permanent-magnet (COR-FSPM) motor is proposed. However, cogging torque and torque ripple of MSOR-FSPM motor are especially worse due to the inherent...
The paper presents the analysis of the performances of an Outer Rotor Synchronous Reluctance Machine as potential candidate for direct-driven low speed industrial application. The influence of slot/pole combination, as well as the number of flux-barriers was investigated in order to arrive to a topology suitable for the targeted application. The proposed machine has the highest average torque and...
This paper presents the design step of an outer rotor synchronous reluctance machine with concentrated winding. The beginning of the study sets the geometrical and electrical constrains. The first step of design is to determinate the optimum topology with reduced number of pole pair for a higher value of fundamental winding factor. Second step of the study is to identify how different types of rotor...
High performance drives with induction machines require use of vector control. The direct torque control and field oriented control are nowadays two most applied vector control methods. The main advantage of the method for direct torque control of induction machines is its simplicity and therefore its robustness. Namely, control variables (the electromagnetic torque and stator flux vector) are estimated...
This paper deals with the derivation of commutation angles for maximum torque for switched reluctance motors operated over their entire speed range. A linearised model of the motor was used for this purpose, and the definition of the rated speed was derived. It is shown that the switched reluctance motor provides constant power in the field-weakening mode in case of continuous current operation. Then,...
Based on analysis of sources of the noise of switched reluctance motor (SRM), the paper puts forward methods to reduce noise in terms of torque ripple and phase change from the point of control view. In the low speed stage, phase current closed-loop segmented according to the sine and cosine curve, maintain a constant torque to reduce the torque ripple. Put forward soft turn-off method at the time...
This paper first analyzes the mechanism of vibration noise and torque ripple of the switched reluctance motor, and then studies methods of reducing torque ripple and noise reduction according to the principle. In order to reduce the noise, two-step phase conduction is proposed when motor starts. Meanwhile, each phase of the shutoff in advance will be replaced by reducing duty ratio slowly. In order...
In this paper an application of artificial neural controller for compensation of torque ripple in electrical drive with PMSM (Permanent Magnet Synchronous Motor) is presented. Due to cogging torque, electromagnetic torque ripple and also, current measurement error of the motor, are created a ripple of angular velocity, finally. This parasite phenomenon influence on the precision of control, especially...
In this paper, control system and simulation of an arc-linear permanent-magnet synchronous machine with normal armature windings and compensation windings are researched. Considering the special structure of the machine, the mathematical model of the machine is investigated and established. The control scheme and the control system for the machine are also researched to reduce the torque ripple for...
For the motorized spindle applications, the interior permanent magnet (IPM) machines is preferred to be chosen than surface mounted permanent magnet (SPM) machines, since it has better magnet protection ability, easier magnet installation, and less magnet loss. However, IPM machines usually has higher stator core loss, higher torque ripple, etc. Especially, when the machine is working under over loading...
Synchronous reluctance machine (SynRM) has attracted much attention thanks to the advantages such as low cost, rugged rotor structure and high efficiency. Conventional drive for the SynRM is the same as that for permanent magnet synchronous machine (PMSM), i.e., the sine-wave drive. In this paper, square-wave drive is proposed for the SynRM. The torque performances with square-wave drive are analyzed...
With the rapid development of electric vehicles, fault tolerance requirements of the motor used in electric vehicles become higher and higher. Multi-phase permanent magnet synchronous motors (PMSM) with their low torque ripple and high reliability and other advantages gradually become the main choice of electric vehicle drive motor. In this paper, taken six-phase double Y-shift 30° windings PMSM as...
The paper presents a prototype of a high-speed Switched Reluctance Motor designed for power tools and results of simulations of the control system of this motor. The basic aims of the simulation was to determine the efficient control of the motor phases and to determine the electromagnetic torque ripple. Simulations have shown the necessity of modifying the drive control algorithm to reduce the amount...
This paper presents a technique to reduce electromagnetic torque ripple of an IPMSG with fractional-slot, concentrated-winding which is connected to a rectifier and a boost converter. Firstly, the generator was controlled using DC current control of the boost converter. The generator torque ripple with this conventional method was found as 29.7% of rated torque which is significant to cause generator...
This paper proposes a novel 16/10 segmented rotor switched reluctance machine (SSRM) for belt-driven starter generators (BSGs) of hybrid electric vehicles. The stator of proposed SSRM consists of two types of stator poles: exciting pole and auxiliary pole, and the rotor of proposed SSRM is made up of a series of discrete segments. Firstly, the concept of the conventional SRM and proposed machine is...
The extensive applications of switched reluctance motor (SRM) have been limited due to its drawback of torque ripple. Thus, the reduction of torque ripple is an important problem in studying the SRM. A novel 16/10 segmented SRM (SSRM) is proposed in this paper. The proposed SSRM performs well in terms of torque ripple and tolerant-fault characteristic. The stator of the proposed structure is constructed...
This paper suggests asymmetric stator teeth design to reduce torque ripple and back EMF Total Harmonic Distortion(THD) for Interior Permanent Magnet Synchronous Machine(IPMSM). IPMSM which has 8 poles, 12 slots is analyzed in this study. From changing design parameter in stator structure, 8 comparison models are analyzed. Analysis of proposed method is carried out using Finite Element Method(FEM)...
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