Design and Evaluation of a Short-Circuit Rotor-Ring for Enhanced Self-Sensing Capability in a Slotless PM Motor

Millinger, Jonas; Bacco, Giacomo; Manzolini, Virginia; Wallmark, Oskar

doi:10.1109/tie.2019.2921266

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…The designs with large diameter might bring some advantages and in the proposed motor, end windings is not a big concern. In step 6, considering step 4 and also (10)- (11), the main dimensions are calculated. In the next step, number of turns is obtained using (4).…”

Section: Design Features and Optimization Using Salp Algorithmmentioning

confidence: 99%

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Design and analysis of a novel topology for slotless brushless DC (BLDC) motors with enhanced torque and efficiency

Mousavi‐Aghdam

2021

IET Electric Power Appl

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A novel high-torque slotless brushless DC (BLDC) motor is proposed. The proposed topology has a unique concentrated winding structure and accordingly the motor design is effectively modified with its dual-rotor structure. The rotor structure of the proposed motor may be modified itself and form three different topologies. First, the basic structures of the new slotless BLDC motor and its operation principle are described. Then, design methodology of the proposed motor is explained. Initial analysis of the motor is subsequently conducted using 2D finite element (FE) simulations. Next, design parameters of the proposed motor are further optimized using Salp algorithm. The proposed topologies are compared with the conventional single and dual-rotor structures. Finally, experimental prototype is built for verification. The simulation and experimental results exhibit that the proposed slotless BLDC motor has high torque and efficiency in comparison with the conventional structures and may be a good candidate for small-sized BLDC motors. Moreover, the results show that the proposed BLDC motor has nearly ideal back-EMF which makes sensorless methods more efficient for the proposed motor. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Design Features and Optimization Using Salp Algorithmmentioning

confidence: 99%

“…For example, in a converter‐fed BLDC motor switching at 10 kHz, the losses are reduced by 50% using 0.1 mm lamination instead of 0.3 mm [10]. In addition, as the position is required to be precisely detected for high‐speed slotless BLDC motors, self‐sensing techniques may be used in motor design [11] or its drive [12].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a novel topology for slotless brushless DC (BLDC) motors with enhanced torque and efficiency

Mousavi‐Aghdam

2021

IET Electric Power Appl

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“…In the first category, motor design method is proposed to achieve self-sensing capability while retaining the torque-speed capability for PMSM used in a hybrid electric vehicle [11]. By adding a short-circuited rotor-ring into the two-pole slotless permanent-magnet motor, the saliency ratio is expanded to 1.8 [12]. An improved inductance model is proposed to reduce the torque ripple and enhance the self-sensing capabilities of TC-PMSMs [13].…”

Section: Introductionmentioning

confidence: 99%

Sensorless Capability Expansion for SPMSM based on Inductance Parameter Identification

Chen,

Ma,

Chen

2024

Preprint

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Pulsating high frequency voltage injection can be used for sensorless control of SPMSM at zero and low speed ranges. However, the sensorless capability still faces challenges to the requirements of industrial application, especially at heavy load status. Aiming at this issue, this article proposes a sensorless capability expansion method for SPMSM based on inductance parameter identification. First, incremental inductances at d-q-axis and cross-coupling inductance are identified by three steps combining the rotating high frequency voltage injection and pulsating high frequency voltage injection, then, using polynomial curve fitting algorithm, apparent inductances are calculated. Second, positive DC current injection at d-axis is proposed to enhance the saliency ratio based on the analysis of parameter identification results. Compared with the conventional =0 or &lt; 0 method, when positive DC current is injected at d-axis, saliency ratio is enhanced. Third, convergence region is expanded at heavy load status and accuracy of rotor position estimation is improved using the proposed method. Finally, the experiment results validate that the sensorless capability of SPMSM is expanded.

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“…Many previous studies have identified the main heat sources of electric motor systems as Joule losses and iron losses [12]- [13]. Whenever the winding temperature exceeds the maximum values allowed by the insulation class, the insulation life time is heavily reduced by the thermal aging degradation effect [14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Stator Iron-Core-Less PMBLDC Motors Considering Both Winding Eddy and Circulating Current Losses

Yang,

Gao,

et al. 2024

IEEE Access

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Thermal analysis of three stator iron-core-less PMBLDC motors considering winding eddy and circulating current losses is investigated. First, the effects of strand diameter, permanent magnet (PM) magnetization and rotating speed on the above mentioned two winding losses and thermal characteristics are investigated by 3D finite element method (FEM). It is found that both strand diameter and rotating speed have great impacts on the temperature rise, parallel and radial magnetizations have almost identical temperature rise results. Then, influence of eddy and circulating current losses on the thermal characteristics of the three PMBLDC motors are further studied, separately. Furtherly, comprehensive study of the two winding losses on the thermal characteristics is carried out. Results show that thermal analysis considering both winding eddy and circulating current losses in parallel thin strands is vital during motor primary design process considering the limited insulation level of wires and PMs. Finally, three prototypes with different combinations of strand diameters and parallel numbers are selected for the calculation of eddy current losses and temperature rise experiment. Experimental results demonstrate the effectiveness of the developed 3D FEM models and validate the obtained simulation results. This paper clarifies the key influence factors, i.e., windings of different wire diameters, PM magnetization and rotation speed, on temperature rise characteristics of such iron-core-less motors, which provides guidance for the subsequent design of such three types of motors. INDEX TERMSStator iron-core-less PMBLDC motor, thermal analysis, winding eddy current loss, winding circulating current loss.

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Design and Evaluation of a Short-Circuit Rotor-Ring for Enhanced Self-Sensing Capability in a Slotless PM Motor

Abstract: Access to the published version may require subscription. N.B. When citing this work, cite the original published paper.

Cited by 7 publications

References 46 publications

Design and analysis of a novel topology for slotless brushless DC (BLDC) motors with enhanced torque and efficiency

Design and analysis of a novel topology for slotless brushless DC (BLDC) motors with enhanced torque and efficiency

Sensorless Capability Expansion for SPMSM based on Inductance Parameter Identification

Thermal Analysis of Stator Iron-Core-Less PMBLDC Motors Considering Both Winding Eddy and Circulating Current Losses

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