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Synchros, General Specification For

2019-06-05
CURRENT
AS20708C
This specification relates to Synchros, 60 and 400 Hz. It is not complete in itself, but shall be used in conjunction with MIL DTL-81963, in which the latter shall be recognized as forming an inherent part of this specification. This standard requires a Qualified Products List (see 6.4).
Standard

Penalties IN Performance of Three-Phase, Four-Wire, 400-Cycle Motors Caused by the Opening of One Phase

2017-11-30
CURRENT
AIR34B
The scope of this SAE Aerospace Information Report (AIR) is to present a guide for the determination of probable power output and the effect on the aircraft system that will be experienced when operating three-phase motors with one phase open. Unfortunately, the above subject cannot be resolved by specific rules. Modern aircraft or missile electrical systems are composed of a wide variety of electrical and electronic components. These components react differently under identical impetus due to the latitude of their design. This latitude of design must be allowed wherever possible to the accessory designer due to the various specification requirements. Therefore, it cannot be over-emphasized that the effect on the airplane or missile system, as well as motor operation, of three-phase motors on two-phase power must be thoroughly investigated.
Standard

Electrical Computing Resolvers

2017-11-30
CURRENT
ARP826A
This document covers resolvers which are used to perform coordinate transformations as well as sine and cosine computations, It includes both the categories of compensated and uncompensated resolvers which perform these functions. Linear resolvers are also included because of their similarity to resolvers.
Standard

Precision Control Motors – 400 Cycles

2017-11-30
CURRENT
ARP497B
This recommendation establishes objectives for high performance control motors to be used with aeronautical and associated equipment in protective enclosures or completely within the shell of the aircraft so that they are subjected only to the internal climatic conditions of heat, cold, shock, vibration, altitude, and humidity. Control motors larger than size #23 are not covered in this document.
Standard

Synchro, 60 and 400 Hz, Size 23

2017-05-18
CURRENT
AS20708/94C
This specification covers the detail requirements for 115 volt, 60 and 400 Hz, size 23 synchros (see 6.1).
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