Characteristic Errors of a Loaded Synchro Transmitter

In this paper, the author accurately describes the characteristic error of a synchro transmitter which results from loading the secondary windings. The second harmonic error resulting from unbalanced loads has long been apparent to synchro manufacturers and users and has already been described.¹ The secondary slot-harmonic error considered in this paper was predicted by the author while he was employed by the Eclipse-Pioneer Division of the Bendix Corporation. The existence of this error is not generally known, and its description has not been previously published. It is also shown that the minimum requirements for winding distributions are not the same in loaded and unloaded operation.