External-Rotor Switched Reluctance Motor for Direct-Drive Home Appliances

Castano, Sandra M.; Yang, Ronz; Mak, Christopher; Bilgin, Berker; Emadi, Ali

doi:10.1109/iecon.2018.8591727

Cited by 17 publications

(4 citation statements)

References 4 publications

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“…Another example of the external-rotor SRM, the 18/24 SRM, is also studied in this section. The design details of the external-rotor 18/24 SRM is presented in [22]. The radial force density applied to the external rotor can be seen in Fig.…”

Section: Rotors Of the External-rotor Srmsmentioning

confidence: 99%

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Liang

Callegaro

Howey

et al. 2021

IEEE Open J. Ind. Applicat.

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This paper presents an analytical method to calculate the temporal and circumferential orders of the radial force density harmonics in switched reluctance machines (SRMs) without running the electromagnetic finite element analysis (FEA). The characteristics of the radial force density harmonics in several SRM topologies are investigated, including the 6/4, 24/16, and 6/14 internal-rotor (IR) SRMs, and 12/16 and 18/24 external-rotor (ER) SRM. The study shows that the temporal and circumferential orders of the radial force density harmonics depend on the pole configuration, the rotational directions of the rotor, the phase excitation sequence, and the rotor or stator radial force density waveform. The acoustic noise of a four-phase 8/6 internal-rotor SRM and a three-phase 12/16 external-rotor SRM was experimentally measured to validate the calculation of the temporal and circumferential orders of the radial force density harmonics. The proposed analytical method helps locate the possible radial force density harmonics of a given SRM configuration. In order to determine the dominant radial force harmonics, the proposed method should be complemented by analyzing the natural frequencies of the motor structure and the forcing frequencies of the radial force harmonics.

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Section: Rotors Of the External-rotor Srmsmentioning

confidence: 99%

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Liang

Callegaro

Howey

et al. 2021

IEEE Open J. Ind. Applicat.

Self Cite

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show abstract

“…As the heart of the majority of kitchen appliances, electrical motors have a determinative role in the efficiency and total performance of the so-called devices. Thus, extensive studies have been carried out for designing compact, high performance, high power to weight ratio and low-maintenance electrical machines [1][2][3][4]. Through years of evolution of the electrical machines employed in home appliances, the universal motor is one of the very first machine that has been widely used.…”

Section: Introductionmentioning

confidence: 99%

Performance optimisation of a segmented outer rotor flux switching permanent magnet motor for direct drive washing machine application

Saghin

Ghaheri

Shirzad

et al. 2021

IET Electric Power Appl

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Electrical machines are widely used in home appliances, the performance of which is mostly related to the quality function of the electrical machines. What has been used so far in home appliances brought with themselves a wide assortment of advantages and disadvantages. With the aim to overcome the drawbacks of the previously implemented electrical motors in washing machines, a new configuration of flux switching permanent magnet motor (FSPM) with the segmented outer rotor (SOR-FSPM) is proposed benefitting from a direct driven drum. To reduce the cogging torque as well as torque ripple and to improve the total harmonic distortion, cutting the stator in a way to lower overlapping between the rotor and stator pole, inserting notches into the poles of the rotor to modify the air gap between the stator teeth and the rotor segments are proposed. The Taguchi method and sensitivity analysis are further applied to find the best combination set of changes in such a way to smoothen the chart showing reluctance between stator and rotor and fix the zero-point crossing of the flux linkages in different rotor positions. Finally, the proposed SOR-FSPM is prototyped, and experimental results along with the finite element method results are discussed and compared in order to verify the design process. K E Y W O R D SAC motors, brushless machines, design of experiments, finite element analysis, optimisation, permanent magnet machines, Taguchi methodsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Switched Reluctance Motor (SRM) has the advantages of rugged construction, low cost high starting torque, wide speed range and inherent fault-tolerance [1][2][3] , which have been used in many fields such as household appliances, electric vehicles and industrial drives [4][5][6][7][8] . The current chopping control (CCC) method for speed regulation in the low speed range are usually adopted, and the current value of each phase winding must be obtained [9] , so the current sensor must be employed in each phase [10] .…”

Section: Introductionmentioning

confidence: 99%

Phase Current Reconstruction With Dual-Sensor for Switched Reluctance Motor Drive System

Cheng

Wang

et al. 2021

IEEE Access

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Due to the rugged construction, high starting torque, wide speed range, inherent faulttolerance and high operating efficiency, switched reluctance motors (SRMs) have been used in many fields such as household appliances, electric vehicles and industrial drives. At low and medium speeds, the current chopping control (CCC) are usually used for SRMs. The current sensors must be connected in series with each phase winding for detecting the phase current, and the number of sensors is usually equal to the number of motor phases. In order to reduce the number of current sensors and the cost of the drive system, this paper propose a general phase current reconstruction method for SRM drive system with two current sensors. Firstly, the excitation, freewheeling and demagnetization circuits of the asymmetric half-bridge power converter are separated into two different paths. The sensors placement method, winding connection method and calculation formula of each phase current are introduced in detail. Then the influence of the turn-off angles on the overlap interval of each phase current is analyzed, and the proposed reconstruction method is further extended to multi-phase SRM. This method can simplify the current decoupling process and is easy to implement without changing the asymmetric half-bridge topology and operating states. Finally, the feasibility of the proposed phase current reconstruction algorithm is verified by simulation and experiment.

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External-Rotor Switched Reluctance Motor for Direct-Drive Home Appliances

Cited by 17 publications

References 4 publications

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Performance optimisation of a segmented outer rotor flux switching permanent magnet motor for direct drive washing machine application

Phase Current Reconstruction With Dual-Sensor for Switched Reluctance Motor Drive System

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