A Novel Dual-Stator Axial-Flux Spoke-Type Permanent Magnet Vernier Machine for Direct-Drive Applications

Zhao, Fei; Lipo, T.Α.; Kwon, Byung-il

doi:10.1109/tmag.2014.2329861

Cited by 145 publications

(64 citation statements)

References 9 publications

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“…Windings of both stators can be connected in series utilizing only one inverter, as in a normal PM machine, or can be controlled separately according to the requirement. The two stators have the same construction, and their positions are maintained unaligned by one-half of a slot pitch in order to more effectively utilize the translator PM flux [13]. The ratio of the split tooth tip to the split tooth pitch τ s was maintained at 0.3 in order to produce the maximum thrust force, whereas the split tooth root to tooth pitch ratio was maintained at 0.5 as it does not have a significant effect on the output of the machine [16].…”

Section: Configuration Of the Proposed Dsslvmmentioning

confidence: 99%

“…In contrast, this flux only goes through half of the machine in conventional dual-stator surface-mounted PM machines. Spoke-type magnets in the translator focus the flux more effectively in the air gap and decrease the leakage flux, resulting in a comparatively higher air gap flux density [13].…”

Section: Configuration Of the Proposed Dsslvmmentioning

confidence: 99%

“…Spoke-type translator PMs magnetized in the horizontal direction focus the flux more efficiently in the air gap utilizing its maximum potential. Therefore, the cost of utilizing highly sintered NdFeB magnets can be reduced by decreasing the volume used in the machine [13]. Magnetic field analysis of the proposed DSS-LVM was performed with the so called unit block approach [17].…”

Section: Working and Design Principlementioning

confidence: 99%

“…Which requires a high rated converter for the machine operation and increases the overall cost of the system [11,12]. To resolve this problem, a flux focusing spoke-type design was proposed in [13]. It effectively increases the flux density value in the air gap, which improves the power factor of the machine along with the power density through a dual-stator compact design.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design and Analysis of a Dual-Stator Spoke-Type Linear Vernier Machine for Wave Energy Extraction

Khaliq

Zhao

Kwon

2016

Journal of Electrical Engineering and Technology

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-In this paper, a dual-stator, spoke-type linear vernier machine (DSSLVM) for wave energy extraction application was proposed. This machine is capable of producing a competitively high thrust force and force density at a low operation speed in direct drive systems. The operation principal and working of the proposed DSSLVM were studied. The stator core height is adjusted to improve the overall force density of the proposed machine while reducing the force ripple. To evaluate the advantages of the proposed DSSLVM, the main performance was compared with that of a recently developed linear primary permanent magnet vernier machine (LPPMVM). The proposed machine exhibited greater thrust force and force density, an improved power factor and lower force ripple with the same permanent magnet (PM) volume compared to the LPPMVM.

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Section: Configuration Of the Proposed Dsslvmmentioning

confidence: 99%

Section: Configuration Of the Proposed Dsslvmmentioning

confidence: 99%

Section: Working and Design Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and Analysis of a Dual-Stator Spoke-Type Linear Vernier Machine for Wave Energy Extraction

Khaliq

Zhao

Kwon

2016

Journal of Electrical Engineering and Technology

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“…An outer-rotor PMVM, which has low power factor and high cogging torque has been proposed by Li et al for direct drive [3]. Zhao et al have proposed a double-stator axial-flux spoke-type PMVM and found that the power factor can be improved by using the spoke PMs [4]. Kim et al have analyzed the performances of PMVM by analytical method and proposed that larger power factor than that of conventional PMVM can be obtained by selecting slot and pole combinations properly [5].…”

Section: Introductionmentioning

confidence: 99%

A New High-Efficiency Double-Stator Split-Pole Permanent-Magnet Vernier Machine with Flux-Focusing Topology

Dai

Zou

et al. 2017

Applied Sciences

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Permanent-magnet vernier machines (PMVMs) have attracted much attention for their high efficiency and output torque in low-speed application. However, the conventional PMVM suffers from the problems of low power factor and high cogging torque. In this paper, a double-stator flux-focusing split-pole permanent-magnet vernier machine (SP-PMVM) with low cogging torque and high power factor has been proposed. The split-pole topology in the vernier motor has been used mainly to modulate the magnetic flux in this paper, although the stator teeth are used for this purpose in some cases. The newly-proposed SP-PMVM topology is characterized by reduced flux leakage through using a flux-focusing topology and staggering approximately half of the pitch angularly between the inner stator and outer stator. Firstly, the vernier principle of the proposed SP-PMVM has been investigated by analytical methods. Secondly, a 12-slot-stator and 22-pole-pair-rotor SP-PMVM has been optimized with the goal of maximum average steady-state torque and the minimum cogging torque and ripple. Thirdly, the overall performance of the newly-proposed SP-PMVM has been analyzed as compared with the conventional PMVM. The results verify that the SP-PMVM can provide higher power factor, higher output torque and lower cogging torque than that of the conventional PMVM in low-speed application.

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Air‐gap flux‐oriented vector control of dual stator induction generator used in wind energy conversion system with novel 13‐zone time optimized space vector‐based hybrid bus clamping PWM

Chatterjee

Mukherjee

Das

2021

Int Trans Electr Energ Syst

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This work presents a novel speed sensor less air-gap flux-oriented vector control of dual stator induction generator (DSIG) used for grid connected, variable speed wind energy generation system. The DSIG consists of two stator windings electrically separated by an angle of 30 with dissimilar pole numbers, which are in the ratio of 1:3. This arrangement offers reduced magnetic core saturation and less harmonics in stator currents, which results into reduced stator winding losses. Moreover, presence of two stator windings makes DSIG suitable to be used in high power application. In conventional rotor-fluxoriented control, the rotor flux is oriented along the d-axis of the rotor winding. But the rotor flux is not easily accessible. Air-gap flux-oriented vector control (AGFOVC) is advantageous as compared to conventional vector control because the air-gap flux is easily accessible and does not require any special arrangement for the measurement of variables. Moreover incorporation of this novel speed sensor less air-gap flux-oriented vector control also eliminates the use of speed encoder as the rotor speed is estimated from the machine terminal variables.Elimination of speed encoder not only reduces the cost of the overall system but also nullifies the error due to mismeasurement of speed and enhances control flexibility and robustness. As a result of which robustness of the system increases. Here, two separate converters are used for the two stator windings of the machine. And the converter switching's are being performed by space vector-based novel dwell time optimized 13-zone hybrid PWM. This special List of Symbols and Abbreviations: L m , mutual inductance between any stator winding to rotor; L 1 , per phase value of leakage inductances for stator I; L 2 , per phase value of leakage inductances for stator II; ψ, flux; ψ stator , stator flux ripple vector; ψ dr , dψaxis rotor flux; ψ qr , q-axis rotor flux; ψ dm , d-axis air gap flux linkage; ψ qm , q-axis air gap flux linkage; i dr , d-axis rotor current; i qr , q-axis rotor current; V dr , rotor voltage along d-axis; V qr , rotor voltage along q-axis; ω sl , slip speed; ω r , rotor speed; ω e , synchronous speed; T e , electromagnetic torque; V REF , reference voltage vector; V ERR , error voltage vector; α, angle between reference voltage vector and stator I voltage vector; X d , stator flux ripple component along the d-axis

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A Novel Dual-Stator Axial-Flux Spoke-Type Permanent Magnet Vernier Machine for Direct-Drive Applications

Cited by 145 publications

References 9 publications

Design and Analysis of a Dual-Stator Spoke-Type Linear Vernier Machine for Wave Energy Extraction

Design and Analysis of a Dual-Stator Spoke-Type Linear Vernier Machine for Wave Energy Extraction

A New High-Efficiency Double-Stator Split-Pole Permanent-Magnet Vernier Machine with Flux-Focusing Topology

Air‐gap flux‐oriented vector control of dual stator induction generator used in wind energy conversion system with novel 13‐zone time optimized space vector‐based hybrid bus clamping PWM

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