Performances comparées des machines à aimants et à réluctance variable. Maximisation du couple massique ou volumique

Design of a Mean Power Wind Conversion Chain with a Magnetic Speed Multiplier

“…To quantify the level of performance, we will compare the combination of multiplier and high-speed generator to a direct drive, low speed generator: a Vernier configuration like that in Figure 10. A study carried out in [1,8] shows that the power density of this configuration is significantly better than that obtained using a more conventional configuration with a large number of poles.…”

“…The operation of the speed multiplier is based, firstly, on the principle of a Vernier type teeth coupling [1,2,10] between a series of alternating permanent magnets and a series of magnetic teeth. The following diagram, which represents a cylindrical or discoid developed structure, demonstrates the principle used in the calculation of the magnetic field in the air gap.…”

“…This pattern is fully defined by four adimensional parameters, α, Λ, s, ε, as shown in the figure 3. It is thus demonstrated, in [1], that b a1 that can be expressed as:…”

“…It must be noted that Vernier-type interaction, of the magnetic teeth with small permanent magnets, can be achieved directly in an electric motor [1,8], which has the double advantage of being of a relatively simple design, with high performance at low speeds, for the given reasons (electromechanical conversion at high frequency). This shows its potential for direct drive use, without multiplier.…”

“…Elementary domain; tooth couplingA parametric study conducted on the elementary pattern[1,10] allows us to quantify the amplitude of the first harmonic of the flux density, b a1 .…”