Axial Gap Type Motor
Axial-gap motors use an axial magnetic flux to rotate a disc-shaped rotor and stator facing each other. The advantage is that it can be constructed thinner than a radial-gap motor, and if properly designed, a high torque can be obtained relative to the magnetic flux density. The use of axial-gap motors expands to a wide variety of applications, including automobiles, and can meet market requirements with a design that takes advantage of its unique structure.
The JMAG Advantage
- Fast 3D electromagnetic simulation
- Mesh modeling that accurately captures short cogging torque periods
- Geometry modeling to capture AC losses in coils and eddy current losses in magnets
- Versatile material modeling function, such as evaluating core losses in soft magnetic composites
- Efficiency mapping function that accounts for these detailed losses
- Total evaluation can be made of the temperature rise due to loss and noise/vibration due to electromagnetic force
Case Study
JMAG Users Conference Presentations
Analytical/Experimental Verification of Thermal Characteristics of Axial Gap Motors, and Comparison Between Axial and Radial Gap Motors
Ren Tsunata, Okayama University
Key Points
Thermal characteristics of the flat-shape and high torque density axial motor are shown and the accuracy in thermal analysis (FEA & thermal equivalent circuit) modeling is studied by comparing experiment results.
Thermal characteristics of the flat-shape and high torque density axial motor are shown and the accuracy in thermal analysis (FEA & thermal equivalent circuit) modeling is studied by comparing experiment results.
Development of Axial-Gap motor for AGV
Tatsuya Higashi, Research Institute of Car and Life-style, DAIHATSU MOTOR CO., LTD.
Key Points
Introduces a study of torque ripple reduction of an 18-slot/20-pole double-sided axial-flux permanent-magnet synchronous motor and a comparison of efficiency maps of the actual machine and analysis.
Introduces a study of torque ripple reduction of an 18-slot/20-pole double-sided axial-flux permanent-magnet synchronous motor and a comparison of efficiency maps of the actual machine and analysis.
Comparison of Axial Gap Motor with SMC Between Analysis and Experimental
Tatsuya Saito, Sumitomo Electric Industries, Ltd.
Key Points
Compares the output and efficiency maps of axial gap motor design and actual machines making use of soft magnetic composite characteristics in core geometry. The prediction of core loss due to DC superposition using a hysteresis model is also discussed.
Compares the output and efficiency maps of axial gap motor design and actual machines making use of soft magnetic composite characteristics in core geometry. The prediction of core loss due to DC superposition using a hysteresis model is also discussed.
Examination to Enhance Efficiency of Axial Gap Motors
Masatsugu Takemoto, Hokkaido University
Key Points
The effects of the motor’s aspect ratio on N-T characteristics and efficiency, and how to reduce losses for high-torque, high-power motors were presented in axial gap motors using development case studies.
The effects of the motor’s aspect ratio on N-T characteristics and efficiency, and how to reduce losses for high-torque, high-power motors were presented in axial gap motors using development case studies.
6 kW Axial Flux Motor Based on Soft Magnetic Composites for Hand Held Power Tools
Cristofaro Pompermaier, Husqvarna Group
Key Points
The output, demagnetization, and losses are evaluated when using soft material composites in an axial gap motor and the performance is compared to a radial gap motor.
The output, demagnetization, and losses are evaluated when using soft material composites in an axial gap motor and the performance is compared to a radial gap motor.
From Customer Specification to Prototyping: Three-dimensional Finite Element Simulation for Axial Flux Machines Constructed from Soft Magnetic Composite Materials
Steven Jordan, Höganäs AB
Key Points
Total evaluation including machine, electromagnetic, and thermal is performed with FEA on a single-sided axial flux motor using soft magnetic composites effective for pumps and compressors in JMAG.
Total evaluation including machine, electromagnetic, and thermal is performed with FEA on a single-sided axial flux motor using soft magnetic composites effective for pumps and compressors in JMAG.
Sample Data
JMAG sample data for the examples used in the column contributed by Höganäs AB can also be downloaded from the Alvier Mechatronics website.
Soft Magnetic Composite Application Examples – Single Sided Axial Flux Machines –
Soft Magnetic Composite Application Examples – Double-Sided Axial Flux Machines –
Application Catalog
In this example, the dimensions of an axial gap motor are optimized by using surrogate models, then the Pareto curves and the effect of reduction in calculation times when using surrogate models are checked.
In this example, presents an example of cogging torque analysis of an axial gap type motor.
In this example, how to use JMAG's 3D magnetic field analysis to carry out a load analysis of an axial gap motor, and then obtain the Torque-Speed curve and the Torque-Current curve.
In this example, the motor performance of axial gap-type motors with changes made to the flatness ratios.
In this example, phenomena confirmed in axial gap-type motors that occur at maximum sound pressure level, from an electromagnetic excitation force and eigen mode perspective.
In this example, the AC copper loss of an axial gap type motor using square wire is evaluated.
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