Torque and Power Density of Coaxial Magnetic Gears

Design Aspects of Conical Coaxial Magnetic Gears

“…The initial design of the CMG as modeled in [30] was used. The optimal half-conical angle is determined to be 10 • [31]. The axial length is 100 mm.…”

“…A sketch of the conical coaxial magnetic gear is shown in Figure 3. The largest diameter from the right side corresponds to the initial CMG design described in [31]. It is a cylindrical design with an outer diameter of 140 mm, as it is presented in Figure 3, right section.…”

“…Recent technological improvements and operational measures have been directed toward the design and topology optimization of magnetic gears in order to maximize the transmitted torque and power, as well as to reduce permanent magnets' usage [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Magnetic field distributions determine the operational characteristics of MGs, such as the magnetic torque densities, losses, cogging and ripple torque, and efficiency [23].…”

“…Higher torque densities are exhibited by magnetic harmonic gears [21]. Various field-flux MGs have been studied, among which axial [27,29], coaxial [15,28,31], radial [30], and linear [31] MGs have been widely considered. An important criterion for determining the optimal construction of a coaxial magnetic gear is an investigation of its harmonic spectrum [28].…”

“…A more compact and lightweight CMG could be developed. The conical CMGs described in [30,31] were based only on geometrical estimations, which showed the possibility of a nearly 20% longer permanent magnet, an up to 1.8 times greater circumferential surface of the air gap, and an up to 30% volume reduction in some design scenarios. However, the produced magnetic torque was not estimated for these conical designs, supposing that it would be kept or even increase due to the longer magnets.…”