Translator Support

In order to impart force and be supported, the cylindrical translator must either be enclosed in a non magnetic support tube or mounted on an axial shaft. The former of these necessarily increases the airgap between the coils and the rotor. The effect of mounting the translator on a shaft can be simulated by a simple modification to the equivalent magnetic circuit. If the shaft is cylindrical, non magnetic and passing through the centre of the magnets, it will provide a path for leakage flux, Sl with a reluctance given by (5.5).

Mo A

Figure 5.4: Equivalent circuit including leakage

The modified equivalent circuit is shown in Figure 5.4 and the effect of the shaft radius on the surface flux density using this equivalent circuit is shown in Figure 5.5.

Figure 5.5: Effect of shaft size on surface flux density

The introduction of a 20 mm diameter hole hence only reduces the flux density at the magnet surface by less than 4% to 0.628 T.

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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