Figure 3 shows a Magnax 275-mm AFPM motor.ģ. Plus, according to the company, AFPM machines can provide the highest energy efficiency of all electrical machines, mainly because there’s no yoke and the flux paths (through the grain-oriented electrical steel cores) are very short. the Magnax AXF225, which has a weight of 14 kg for a peak power of 170 kW (Fig.
A good example is the comparison of the BMW I3 motor, which has a weight of 41 kg for 125-kW peak power vs. The slim and lightweight structure results in a machine with a higher power and torque density. Here’s a comparison of the BMW I3 motor and the Magnax AXF225.ĪF machines are more compact because they’re much more effective from an electromagnetic perspective than RF machines, which is often crucial for built-in applications, such as in vehicles. The entire manufacturing chain is based on low-cost, easy-to-scale production processes.ĪFPM machines perform well at a very broad range of rotational speeds, which makes them suitable for high-speed-low-torque and low-speed-high-torque applications.Ģ.A patented system for cooling the windings, for the lowest possible stator temperatures.High-performance grain-oriented electrical steel (ThyssenKrupp GOES), lowering the core losses by as much as 85%.Concentrated windings, for the lowest possible copper losses (no coil overhangs).Rectangular cross-section copper wire, for 90% possible copper fill factor.Yokeless stator, for the shortest possible flux paths.Dual permanent-magnet rotors, for the highest possible torque-to-weight ratio.traditional RF direct-drive geneators, which also results in lower costs).ĭesign features of the Magnax axial-flux machine include: Reduced resources requirement (½ to ⅓ of materials required vs.Reduced mass (2X to 5X lighter than geared or traditional geared direct-drive generators).Reduced length (5X to 8X shorter than traditional wind-turbine drive trains).Increased efficiency (+96% efficiency, up to 97% for larger generators).
#Axial flux motor generator#
The technology is scalable from small motors (i.e., electric vehicles) to large generators (i.e., wind-turbine generators).Īccording to the company, a 100-kW axial-flux permanent-magnet (AFPM) generator for a mid-size wind turbine offers the following benefits: The motors have zero overhang that is, 100% of the windings are active. The yokeless AF motors have a shorter flux path, and permanent magnets are farther away from the axis, resulting in greater efficiency and leverage around the central axis.įurthermore, thanks to the axial flux design, very little copper is wasted on overhanging loops on the windings. Magnax says the key to the high power density is its motors’ yokeless AF design with two rotors at each side of the machine. Comparison of radial- and axial-flux machines. Figure 1 provides a comparison of the RF and AF technologies.ġ. Magnax offers a new concept, though-a machine that operates with axial flux (AF). Today, most electric machines operate with radial flux (RF).
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