Overview
Closeup |
In this axial gap motor, the excitation coils rotate relative to the permanent
magnets. Since the magnetic circuit of the motor has the 3D flux paths,
the analysis should use a 3D model to evaluate the motor performance.
This note presents the use of magnetic field analysis to evaluate the speed-torque
curve and the torque-current curve of an axial gap motor through the load
analysis. |
Magnetic Flux Density Distribution
Closeup |
Figure 1 shows the magnetic flux density distribution at the rotation speed
of 1000 rpm.The magnetic flux density is distributed in the axial direction
of the rotor coil due to the structure of the axial gap motor. Also, the
magnetic flux density is particularly high between magnetic poles, causing
the magnetic saturation. As a result, the torque is reduced due to flux
leakage. |
Torque-Speed Curve and Torque-Current Curve
| Figure 2 and Figure 3 show the analysis results of the speed-torque and
torque-current curves, respectively. The torque decreases as the rotation
speed increases, and the torque increases when the current increases. Thus,
the characteristics of the axial gap motor are clearly shown. |
Closeup |
Closeup |
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