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The 9K38 Igla (Russian: Игла́, "needle", NATO reporting name SA-18 Grouse) is a Soviet/Russian man-portable infrared homing surface-to-air missile (SAM) system. A simplified, earlier version is known as the 9K310 Igla-1 (NATO: SA-16 Gimlet), and the latest variant is the 9K338 Igla-S (SA-24 Grinch).
1948 – The Trojan Minimotor begins production in Britain and becomes immediately popular. 1949 – The Mobylette is introduced in France. Its concept was "a bicycle with a nice permanent back wind". This pattern gave its name to the French slang term for moped. 30 million copies were produced until 2002, evolving much through different models ...
[2] [3] Once started at synchronous speed, the motor can operate with sinusoidal voltage. Speed control requires a variable-frequency drive. High-powered SynRMs typically require rare-earth elements such as neodymium and dysprosium. However, a 2023 study reported the use of a dual-phase magnetic laminate to replace them.
This page is subject to the extended confirmed restriction related to the Arab-Israeli conflict. S-300 family NATO reporting name: SA-10 Grumble, SA-12 Giant/Gladiator, SA-20 Gargoyle, SA-N-6 Grumble, SA-N-20 Gargoyle S-300 air defense system at the 2009 Moscow Victory Day Parade rehearsal, Red Square, 28 April 2009. Type Long-range surface-to-air and anti-ballistic missile system Place of ...
Some specify which end of the filament is to be powered by the positive side of the filament power supply (usually a battery). All have glass bodies that measure from 0.285 to 0.400 inches (7.2 to 10.2 millimetres) wide, and from 1.25 to 2.00 inches (32 to 51 millimetres) in overall length. 1C8 – Pentagrid converter, R8
To determine the number of coil groups per phase in a 3-phase motor, count the number of coils, divide by the number of phases, which is 3. The coils may span several slots in the stator core, making it tedious to count them. For a 3-phase motor, if you count a total of 12 coil groups, it has 4 magnetic poles.
Johann Faulhaber (5 May 1580 – 10 September 1635) was a German mathematician, specifically, a calculator (Rechenmeister). Ioannes Faulhaberus Mathematicus Imperialis Ulmæ Natus Biography
The two coils at centre are mechanically connected, and are energized in "quadrature" (meaning a phase difference of 90° (π/2 radians) between the flux of the magnets and the flux of the coils). The bottom and upper coils in this particular case have a phase difference of 90°, making this a two phase motor (not to scale).