Abstract
Owing to various lacks of symmetry and homogeneity in the tachometer, a zero-speed or residual voltage usually appears. As the current distribution is distorted by the dis-symmetry or the in-homogeneity in the rotor, the residual voltage is changed by the rotor position. The distorted current distribution can be easily analyzed by the use of compensation theorem.
The analyses are carried out to show how the dissymmetries and the inhomogeneities [(1) the inhomogeneities in the rotor conductor. (2) the distribution or position of inhomogeneities. (3) in the form of an out-of-round rotor] have influence on the variation of the residual voltage, and are compared with the experimental results. The result which is obtained in this way is very useful for the tachometer design and its manufacture.
