Design of Winding Changeable BLDC Motor Considering Demagnetization in Winding Change Section

Seol, Hyun-Soo; Kang, Dong-Woo; Jun, Hyun-Woo; Lim, Jonghun; Lee, Ju

doi:10.1109/tmag.2017.2695890

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…Hence, all the PMs are subjected to the armature reaction in all directions. The amount of change in the motor torque constant [Nm/Arms] before and after the irreversible demagnetization analysis [25]- [27] in the worst operating conditions described above is expressed as the irreversible demagnetization rate, K d , as (1).…”

Section: Proposed Optimal Design Of a Spoke-type Ipm Motor Allowing −3% Irreversible Demagnetizationmentioning

confidence: 99%

Optimal Design of Spoke-Type IPM Motor Allowing Irreversible Demagnetization to Minimize PM Weight

Yoon

Hwang²

2021

IEEE Access

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In this study, we introduce an optimal design for a spoke-type interior permanent magnet (IPM) motor that can minimize PM weight by allowing irreversible demagnetization, unlike the conventional motor design method that does not allow irreversible demagnetization. The spoke-type rotor structure has the advantage of concentrating the magnetic flux around the rotor core. However, part of the PM near the surface of the stator tooth becomes sensitive to the armature reaction and external magnetic factors. Therefore, typical spoke-type rotor construction follows a limited design process that does not allow irreversible demagnetization. Although the manufacturing process allows tolerance for the demagnetization rate, motor design without considering the demagnetization rate in all the design stages becomes a design constraint and limits the performance area. In this study, the performance improvement is examined, when irreversible PM demagnetization is allowed up to −3%, and is not zero. For optimal design, Latin hypercube sampling (LHS), the kriging model, and genetic algorithm (GA) are utilized. With the proposed design process, motors are effectively designed to reduce the PM weight by 23.7%, compared to the initial design model while maintaining an efficiency almost similar to that of the initial design model. INDEX TERMS Brushless AC motor, spoke-type interior permanent magnet motor, NdFeB magnet, irreversible demagnetization, demagnetization rate, armature reaction. KEUN-YOUNG YOON (Member, IEEE) received the B.S. degree in electronic and computer engineering, the M.S. degree in electronic, electrical, control, and instrumentation engineering, and the Ph.D. degree in mechatronics engineering from

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Section: Proposed Optimal Design Of a Spoke-type Ipm Motor Allowing −3% Irreversible Demagnetizationmentioning

confidence: 99%

Optimal Design of Spoke-Type IPM Motor Allowing Irreversible Demagnetization to Minimize PM Weight

Yoon

Hwang²

2021

IEEE Access

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“…For instance, the constant‐power region can be significantly widened by reducing

N_{s}

if sacrifice of torque level at constant‐torque region is tolerable. Alternatively, additional power electronic circuit with controller can be designed for changing

N_{s}

as reported in [54–56].…”

Section: Influences Of Design Parameters On Fw Performance Of Nsw Ipmmentioning

confidence: 99%

Influence of design parameters on flux‐weakening performance of interior permanent magnet machines with novel semi‐overlapping windings

Gündoğdu

Kömürgöz

2020

IET Electric Power Applications

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This study performs a design and parametric study of interior permanent‐magnet (IPM) machines equipped with novel semi‐overlapping windings (NSWs). The influence of the key design parameters including; number of turns per phase, stack length, distance and angle between V‐shaped magnets, rotor yoke thickness, magnetic bridge width and thickness and number of magnet segments on the flux‐weakening (FW) performance characteristics are evaluated in detail. The influence of material of segmentation (material of bridge namely, air or iron) is also considered. A combination of analytical calculation‐based program and a time‐stepping 2D finite‐element analysis based program are employed to evaluate the FW characteristics. The accuracy of the FW calculations, particularly the performance at high‐speed regions, is verified over changes in torque components; namely reluctance and permanent magnet (PM), inductance components, PM flux coefficient and inverse saliency ratio due to the change in considered design parameter. The electromagnetic torque, torque ripple, output power and FW capability are investigated by parametric analyses. Moreover, the power losses and efficiency maps together FW curves are calculated for the optimal NSW IPM machine. The experimental measurements, taken from manufactured prototype, verify that the performed analyses and methods described in this study are accurate and reliable.

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“…The demagnetization curve of a permanent magnet limits the magnetic overload capacity of the machine [2]. The general causes of demagnetization of magnets are heavy inrush current at the time of sudden overloading or winding fault, temperature rise due to heat losses in a winding, heat in magnets because of eddy currents from it, armature reactions, mechanical damage, rusting in case of in-wheel PM motors and aging [1], [3]- [6]. Demagnetization faults in PM machines may significantly reduce output torque and spoil motor characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Review on Poles Demagnetization in Permanent Magnet Motors

Mitul G. Patel

2024

jes

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Permanent magnet motors like BLDC and PMSM are widely used in industry and electric vehicles. Demagnetization of permanent poles in motors is the biggest problem. To design a machine that has good efficiency and no demagnetization problems, real-time fault diagnosis is necessary. Various causes of demagnetization, detection, and measuring methods are discussed by researchers analyzed in this paper. Apart from the comparison of different methods of fault detection, a general comparison among the different methods of various strategies has been made based on the torque ripple, analysis of harmonics, current waveform, back e.m.f. waveform and losses of the PM motor. Finite Element Analysis (FEA) and analytical method adopted by some researchers to get the results. Moreover, considering the importance of BLDC in the electric vehicles (EVs) industry, the selection of the best method to detect demagnetization has been discussed.

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Design of Winding Changeable BLDC Motor Considering Demagnetization in Winding Change Section

Cited by 13 publications

References 5 publications

Optimal Design of Spoke-Type IPM Motor Allowing Irreversible Demagnetization to Minimize PM Weight

Optimal Design of Spoke-Type IPM Motor Allowing Irreversible Demagnetization to Minimize PM Weight

Influence of design parameters on flux‐weakening performance of interior permanent magnet machines with novel semi‐overlapping windings

A Review on Poles Demagnetization in Permanent Magnet Motors

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