SAE AS 20708B:2014 pdf free

SAE AS 20708B:2014 pdf free.Synchros, General Specification For
Synchro zero is that position of the rotor with respect to the stator at which minimum voltage is induced in the secondary circuit specified, and at which the secondary voltage(s) specified is in-time-phase (see 6.6.8) with the primary voltage specified (see 4.3.4). The order in terms of maximum voltages in the stator terminals is in the order S1, S2, S3, when the rotor is turned in a positive direction (see 3.4.1). The minimum voltage position with the secondary unloaded is defined as the angular position where the secondary voltage of fundamental frequency that is in-time-phase with the secondary voltage at maximum coupling is zero. The phase-sensitive voltmeters in Figures 1, 2, and 3 shall be the type as described in 4.8.12.
Synchro zero of control transformers shall be determined with the synchro connected in accordance with Figure 3. When the synchro shaft is rotated in the positive direction (not to exceed 180 degrees) from synchro zero, the voltage E(R2R1) shall be in approximate time phase with E(S3S2).
The end function of the spline on synchros with splined shafts is as a rotational positive fastening. These splines are not to be used as gears. The tooth form shall be full depth involute on all splines. All splines for the different sizes of Synchros with spline shafts (11, 15, 18, 23, 31, and 37) shall be inspected using methods which enable the Synchros to meet the performances requirements of AS20708 and the applicable specification sheet.
As appropriate during or following each of the environmental tests, the following minor relaxations in specified requirements may be permitted. It should be noted that the relaxations are not cumulative; e.g., electrical error, if accepted at up to 1 minute of arc in addition to the specified maximum value following vibration, shall still not be more than 1 minute of arc in addition to the specified maximum value following low impact shock.SAE AS 20708B pdf free download.