MIL-S-81746A

SERVTORQ, GENERAL SPECIFICATION FOR

Year: 1991

Abstract: This specification covers the general requirements for integrated servomechanized synchro receiver-servomotors (acronym SERVTORQ). It is not complete in itself, but must be used in conjunction with MIL-S-81963 which forms an inherent part of this specification.
The nomenclature consists of the item name, Servtorq, followed by a type designation including a modification letter and a part identifying number. All units having the same nomenclature must be mechanically and electrically interchangeable for all military applications. The type designation is indicated by a combination of digits and letters. The type designation of a 26-volt unit should be preceded by "26V". The complete nomenclature of a size 23, 115-volt, 60-or 400-Hz Servtorq is illustrated in Table I. Nomenclature for new servtorq types will be assigned by the Naval Air Systems Command, Department of the Navy.
The first two characters specify the maximum diameter in tenths of an inch. If the diameter is not a whole number of tenths, the next higher tenth should be used.
The succeeding two characters, ST, indicate the function of the unit is that of a Servtorq. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to the Commanding Officer, Naval Air Engineering Center, Systems Engineering and Standardization Department, Code 53, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
The succeeding digit or digits indicate the frequency of the input power and signal in Hertz (Hz) in accordance with the following: 
         Supply Frequency (Hz)              Code                  60                            6                400                            4             60 or 400                        64


An upper-case letter "A" following the frequency code denotes the original or basic design of a standard servtorq. The first modification that affects the external mechanical dimensions or electrical characteristics of the basic unit will be indicated by the upper-case letter "B". Succeeding design modifications should be indicated by "C", "D", etc., except the use of "I", "L", "O", and "Q" is prohibited.
The part identifying number (PIN) should consist of the letter "M", the basic specification sheet number (not including the revision letter), an assigned dash number, and a suffix letter designating the latest modification letter in the type designation, as shown in Table II.
Intended Use: The intended use for servtorqs covered by this specification must be in accordance with MIL-S-81963.
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