One approach is to use an attenuated con- trol device, which retains a weak magnetic force and therefore helps to prevent participants and researchers from correctly identifying the device as a placebo or sham [32,33]. One limitation of this approach however is that rather...
The structure of the magnetic system of the actuator 50 also provides the magnetic circuit of the permanent magnet 72 with high permeability, least path possible, magnetic circuit elements through the main armature pole 73, through one high area air gap 80, through the ferromagnetic common or cen...
The greatest reduction in the cogging torque (about 87%) is occurred for the magnet skewing approach with γ = 30°, and for the proposed approach with 3 equal magnet pieces and β = 1.5°. A reduction of about 80% is obtained using the magnet skewing approach with 18° Experimental ...
21 is to be detached and the member having a detaching surface extending as far as the pole surface of the holding magnet; pivotal movement of the lever from its rest position (see Fig. 2), causes the roller 5 to move away the workpiece with a force which is greatest at the beguming...
Today, the two greatest obstacles to using a permanent magnet motor are, first, the belief that it violates the conservation of energy law; and, secondly, that the magnetic fields of attraction and repulsion decrease according to the inverse square law then the air gap is increased. In fact...
type provides higher torque density, reduced stator magnetomotive force (MMF) harmonics, lower torque ripples under healthy conditions, and lower unbalanced magnetic force (UMF) under faulty conditions [27]. Compared with the most general three-phase machines, it is worth noting that the MTP ...
where W is the energy of the magnetic field in the motor when no current is applied to the winding and α is the relative position of the stator and rotor. Assuming that the magnetic conductivity of the armature core is infinite, the energy of the magnetic field inside the motor can be ...
According to his definition, “The value of the unknown quantities that has the greatest chance of being correct is the one for which the accuracy-measuring numbers are multiplied by the sum of the squares of the discrepancies between the observed and calculated values”. Since then, several ...
The levitation force (Figure 5a) is the greatest when the fill factor γhm = 0.3, while the braking force (Figure 5b) is the lowest when γhm = 0.9. That means that the most effective, in terms of the mass of the PMs, is the arrangement with a fill factor of 0.3 and the ...
The distribution characteristics of radial electromagnetic force were theoretically analyzed by FEM method [34]. The results in [36–38] show that the lowest mode number of radial force harmonics is the greatest common divisor of pole Energies 2015, 8 9690 and slot combination. The effect of ...