Circulating currents of delta connected fractional slot machines for mass production

Dinca, Christian; Schäfer, Uwe

doi:10.1007/s00502-015-0281-x

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…For zero-sequence flux-linkage parameterization terminal current sensors, measuring 1,2,3 are not sufficient, additional phase current sensors, measuring 12,23,31 are necessary. The zero-sequence current 0 can calculated through (13).…”

Section: Zero-sequence Flux-linkagementioning

confidence: 99%

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DQ0 Modelling and Parameterization of small Delta connected PM Synchronous Machines

Decker

Foitzik

Rehm

et al. 2020

2020 International Conference on Electrical Machines (ICEM)

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This paper presents an extended dq0-model for small delta-connected Permanent Magnet Synchronous Machines (PMSM), the design of a prototype and the parameterization of the model parameters by testbench measurement. The familiar dq-fundamental equations are thereby extended to consider harmonic effects. This allows the inclusion of the zero-sequence flux-linkage. The model, based on the dq0-flux-linkages and the stator resistance, enables the calculation of the zero-sequence current and a more precise inner torque estimation compared to state of the art fundamental models. The rotor position dependent dq-flux-linkage estimation is based on the measured dq-voltages and the solution of the simplified differential system equation. Detection of the zerosequence current yields to the zero-sequence flux-linkage. In this paper, we also present a prototype design of a PMSM machine with additional zero-sequence current sensing. Testbench measurement at constant controlled currents enables the parameter identification. For validation, the identified parameters are compared with existing Finite Element Analysis.

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Section: Zero-sequence Flux-linkagementioning

confidence: 99%

“…Reasons for the difference, are imprecise parameters for the FEA simulations as discussed before. Further factors which influence particular the zero-sequence current are detailed investigated in [13].…”

Section: Zero-sequence Flux-linkage Parameterization 1) Zero-sequementioning

confidence: 99%

DQ0 Modelling and Parameterization of small Delta connected PM Synchronous Machines

Decker

Foitzik

Rehm

et al. 2020

2020 International Conference on Electrical Machines (ICEM)

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“…The electric machines used in these applications are often delta-connected fractional-slot concentrated-winding (FSCWs) permanent-magnet synchronous machines (PMSMs) due to their high power density and ease of manufacturing [8]. The delta-connection of these highly integrated drives, causes circulating phase-currents (0-sequence) [9]. This component is often neglected in existing models.…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis of Delta-Connected PMSMs Using Lookup Table-Based Models—Influence of the 0-Sequence Component

Pinto

Pop

Myrria

et al. 2022

IEEE Trans. Ind. Electron.

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In this paper, a multiphysics simulation workflow based on the use of reduced-order models (ROMs) to decrease the computation time is presented. Using FE pre-computed flux-linkage and lumped force lookuptables (LUTs) in function of dq0 currents and rotor position, an electromagnetic model of a permanent-magnet synchronous machine (PMSM) is developed. Coupled to a mechanical state-space representation, the complete workflow allows to predict the vibrations of the motor. Using our model, the influence of the 0-sequence current on the vibration spectrum is investigated. A detailed description on the parameter identification for homogenized stator core of the considered 12-slot 10-pole delta-connected fractional-slot concentrated-winding (FSCW) spoke-type PMSM is also given. The numerical results are validated with experimental data for the machine at hand. Because of the large amount of FE data required, the workflow is best suited for the optimization of motor control schemes (instead of the initial design optimization) with the purpose of reducing the noise, vibration, and harshness (NVH).

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“…For this winding system no star-point connector is needed, which saves material and reduces the number of process steps during manufacturing. Therefore, delta-connected stator windings are well suited for mass production with a high demand on automated manufacturing and low costs [1].…”

Section: Introductionmentioning

confidence: 99%

“…To evaluate the additional copper losses in the delta-connected machine, the ZSCC is investigated under no-load operation of the motor. In [1] circulating currents in a delta-connected machine due to manufacturing tolerances, iron saturation as well as asymmetrical load conditions, are discussed. The authors conclude that electrical and mechanical tolerances have a big impact on circulating currents.…”

Section: Introductionmentioning

confidence: 99%

Loss Comparison of Small Delta- and Star-Connected Permanent Magnet Synchronous Machines

Rehm

Breining

Decker

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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Delta-connected stator windings are often used in mass production of small Permanent Magnet Synchronous Machines (PMSMs). In comparison to star-connected stator windings, a delta-connected winding system offers advantages for manufacturing and lowers production costs. A main disadvantage of motors with such a winding system are additional losses caused by the Zero-Sequence Current Component (ZSCC). In this paper the ZSCC and its impact on the generated losses in a deltaconnected PMSM used as a traction motor for a pedal electric cycle (Pedelec) is analysed. The calculated results are compared to those of a star-connected PMSM with the same design. We will show that the amplitude of the ZSCC depends on the operating point of the machine. As a result, the copper losses in the deltaconnected machine are up to 5.8 % higher than the ones in the star-connected machine. On the other hand, the iron losses are 1 % smaller in the delta-connected machine. The efficiency of the delta-connected machine is still up to 4 % smaller.

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Circulating currents of delta connected fractional slot machines for mass production

Cited by 4 publications

References 1 publication

DQ0 Modelling and Parameterization of small Delta connected PM Synchronous Machines

DQ0 Modelling and Parameterization of small Delta connected PM Synchronous Machines

Vibration Analysis of Delta-Connected PMSMs Using Lookup Table-Based Models—Influence of the 0-Sequence Component

Loss Comparison of Small Delta- and Star-Connected Permanent Magnet Synchronous Machines

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