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This paper examines the efficiency performance of an automotive-size high-speed switched reluctance drive. It investigates the impact of a smooth torque control algorithm on the efficiency and losses in the drive. In automotive drives, the application of a dedicated algorithm for torque ripple reduction at low to medium speed is indispensable to avoid excitation of mechanical resonances in the drive...
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...
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...
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...
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...
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)...
Torque calculation using the d-q axis has the advantage of faster execution time; however, the torque ripple cannot be considered in torque calculation using the d-q axis equivalent circuit because the time-dependent component is removed. In this work, with d-q transformation, the characteristics of some parameters were identified. These characteristics were considered for representing torque ripple...
In this paper, a novel boost chopper converter-based torque sharing function (TSF) control strategy for switched reluctance motors (SRMs) is proposed to reduce the torque ripple. Thanks to advantages of the simple structure, low cost, high reliability, and wide speed range, SRMs have attracted much attention in the industrial applications. However, the torque ripple is one critical issue to restrict...
This paper presents a 12-sector control method, based on the new zero voltage vectors (ZVVs), in direct torque control (DTC) of brushless DC motor (BLDCM). The 12-sector method can apply more new ZVVs in a single control period than the 6-sector method. As the new ZVVs play a key role with respect to preventing the freewheeling current in the switch off phase, this method is better qualified to avoid...
In order to suppress unreasonable torque ripple of direct torque control (DTC) in surface permanent magnet synchronous motor (SPMSM), the SPMSM-DTC mode is established and the effect of voltage vectors selected by switching table on torque is analyzed. The conclusion of the change in torque is contrary to expectation when the changes of stator flux and torque angle (angle between stator and rotor...
Brushless DC motor has been becoming more popular in industry, electric and aerospace applications, making the control for four-quadrant operation of Brushless DC motor greatly significant. This paper presents pulse width modulation (PWM) control mode for four-quadrant operation of Brushless DC motor, which can realize both motoring and braking operation at the same rotation direction. Based on the...
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