Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Leitner, Stefan; Krenn, Georg; Gruebler, Hannes; Muetze, Annette

doi:10.1109/tia.2020.2990876

Cited by 5 publications

(7 citation statements)

References 37 publications

(54 reference statements)

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“…The analyses of the magnetic performance parameters in this paper are based on extremely accurate torque measurements. Since the torque quantities of interest fall within the sub-milli-Newton meter range, an unconventional rheometer-based test setup is used, as described in detail in [27]. The rheometer MCR502 WESP from Anton Paar GmbH [33] is utilized-in its controlled shear rate (CSR) mode-to measure the no-load torque waveforms of the studied motors at different roational speeds.…”

Section: Measurement Setup and Techniquementioning

confidence: 99%

“…Windage effects and friction can be neglected in this test setup [27], the latter due to the rheometer's air-bearings and the missing connection between the rotor and the stator (see Fig. 3).…”

Section: Measurement Setup and Techniquementioning

confidence: 99%

“…For very low speeds (e.g., n = 1 rpm), T eddy can be neglected. Hence, the cogging torque and the hysteresis torque can be separated by the mathematical manipulation of the torque waveforms measured in both the clockwise (CW) and counterclockwise (CCW) directions [27]:…”

Section: Measurement Setup and Techniquementioning

confidence: 99%

“…Recently, a measuring method has been proposed with which the actual cogging torque and hysteresis torque waveforms of SFHP motors can be determined experimentally [27], eliminating the influence of friction on the results. In general, both the cogging torque and the hysteresis torque directly translate into the torque ripple of a motor.…”

Section: Introductionmentioning

confidence: 99%

“…2. The stator lamination stacks are studied by means of no-load torque investigations performed with a rheometer [27]. Thereby, it is possible for the first time to investigate in great detail certain manufacturing influences on the cogging torque and hysteresis torque waveforms, as well as the iron losses of the respective stator lamination stack.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Manufacturing Influences on Magnetic Performance Parameters of Sub-Fractional Horsepower Motors

2021

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Depending on the stator lamination manufacturing processes (e.g., punching, laser cutting, clamping, welding, interlocking, bonding), the motor's magnetic performance parameters such as cogging torque, hysteresis torque, and iron losses can vary significantly. In sub-fractional horsepower permanent magnet motors, the manufacturing influence is typically even more severe because, due to their small dimensions, practically the whole stator material is likely to be affected. This paper analyzes the magnetic performance parameters cogging torque, hysteresis torque, and iron losses of three different stator lamination stacks (i.e., M250-35A punched with interlocking, M250-35A laser cut with bonding, NO10 laser cut with bonding) of a sub-fractional horsepower singlephase brushless permanent magnet motor often found in automotive fan applications. A rheometer is used for extremely accurate torque measurements in the sub-milli-Newton meter range, and electron backscatter diffraction measurements are performed to visualize changes in the grain morphology and crystal orientation. The findings reveal that the punched stator with interlocking is affected the most by the manufacturing process, showing the lowest cogging torque yet the highest average hysteresis torque and thus up to 40 % higher iron losses. The results presented in this paper allow for both making basic stator lamination design choices and translating the iron losses, as well as the hysteresis torque and cogging torque waveforms, of a laser cut and bonded prototype into those of its punched and interlocked mass-produced counterpart.

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Section: Measurement Setup and Techniquementioning

confidence: 99%

Section: Measurement Setup and Techniquementioning

confidence: 99%

Section: Measurement Setup and Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Manufacturing Influences on Magnetic Performance Parameters of Sub-Fractional Horsepower Motors

2021

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Novel Quasi-Three-Dimensional Modeling of Axial Flux In-Wheel Motor With Permanent Magnet Skew

Kim

Woo

2022

IEEE Access

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This paper presents a characteristic analysis of axial flux permanent magnet machines (AFPMMs) for in-wheel electric vehicles. Preferentially, a novel quasi-3-D model is developed for the fast and accurate design of AFPMMs. In electromagnetic field analysis, combined with field reconstruction method, the computation time of 2-D solutions is significantly reduced. With the use of time sweeping of the basis function, only the static finite element (FE) analysis is performed to calculate the air-gap flux distribution at the entire rotor position, whereas the conventional 2-D solutions require a transient FE analysis. In the shape sweeping process of the basis function, the virtual air-gap section method is introduced to take into account that the ratio of slot opening to slot pitch is different depending on the radius of analysis plane, which causes errors in the analysis results of the conventional quasi-3-D method. The virtual air-gap sections are obtained by interpolation of the spatial field between the mapped cylindrical planes. The proposed technique reduces the number of 2-D analysis planes required for high accuracy in the conventional quasi-3-D method, and it can also predict the air-gap magnetic flux distribution for skewed permanent magnets without additional FE analysis. Finally, using the magnetic fields calculated in the proposed method, the electromagnetic performances of the AFPMM are calculated, such as load torque, cogging torque, attraction force, and back-EMF. The analysis results were verified by comparison with the measurement results.INDEX TERMS Axial flux permanent magnet machine, in-wheel motor, magnetic field reconstruction, permanent magnet skew, quasi-3-D finite element analysis, virtual air-gap section method.

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Novel Bent Steel Sheet Strip Based Two-Pole Single-Phase BLDC Motor Topology for Low-Cost Fan Applications

Leitner

Saed

Muetze

2021

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

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Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Cited by 5 publications

References 37 publications

Effect of Manufacturing Influences on Magnetic Performance Parameters of Sub-Fractional Horsepower Motors

Effect of Manufacturing Influences on Magnetic Performance Parameters of Sub-Fractional Horsepower Motors

Novel Quasi-Three-Dimensional Modeling of Axial Flux In-Wheel Motor With Permanent Magnet Skew

Novel Bent Steel Sheet Strip Based Two-Pole Single-Phase BLDC Motor Topology for Low-Cost Fan Applications

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