What is the synchronous rotation?
Let's place in the rotating magnetic field constant magyonit, established on axes so that its axis the vrayoshcheniya was combined with the field spin axis. If as the tayoky magnet to use very easy magnetic needle, then it rotates together with the field with synchronous speed (from the Greek word "sinkhronos" — matching on time), i.e. the field and the arrow make one revolution for the same time. Magnityony forces, aiming to establish the arrow in the direction of the field, support this rotation.
But if the mobile magnet is rather heavy, then under the deyyostviye of the rotary field he will not move.
Influencing such motionless magnet, the rotary field during the half of the turn creates the torque, and during the second half of the turn — the braking moment as magnetic siyola pull the magnet towards rotation of the field, in the protivopoyolozhny party. If by means of any adaptation to disperse the magnet to field speed, i.e. to synchronous speed, then, having entered synchronism, the magnet will rotate with the field speed. It will keep this synchronous speed and when to it it is come to overcome any tormozyayoshchy force.
Only in this case it will lag behind the rotary field on the neyokotory constant corner. This corner of subjects is more, than force which more is braking. If this force becomes too bolyyoshy, then the magnet will stop, will drop out of synchronism. It will not be able to rotate more slowly than the field. Synchronous rotation is used in the synchronous motors used, mainly, when the dviyogatel of considerable power rotating with strictly postoyanyony synchronous speed is necessary.Top