AC contactor mainly depends on its energy-saving program works and the corresponding structure processes. Fat suction within the electromagnetic AC contactor by Circuit Breakers constant component F0 and F ~ alternating component composition. Among them:
Constant component: F0 = Fatm / 2 (Fatm = 107 B2 MS / 8π)
Alternating component: F ~ = F0 cos 2ωt.
At work, due to the armature reaction force always been the role of the spring, the contact springs Fr reaction force, the electromagnetic suction averages Fat> Fr; when Fat <Fr armature at the beginning of the release voltage stabilizer, Fat> Fr armature also was attracted state, so Again and again, the armature vibration and noise. At this point in the alternating magnetic core produced by hysteresis loss and eddy current loss will cause the core heat (superposition of silicon can play a role in reducing the eddy current losses). To reduce operating noise is usually electri calmete open in the small capacity of the electromagnetic system yoke ends embedded in a small groove corresponding short-circuit ring, and its role is to be divided into two parts by the core flux, that does not pass through the magnetic flux Φ1 and short-circuit loop the magnetic flux Φ2 through the short-circuit loop, and Φ2 lag Φ1, suction is always greater than the synthesis reaction, thereby reducing the vibration and noise, but also increases the copper loss accordingly.
AC contactor power mainly by the retention power and pull the power of two parts, although larger coil pull starter instant power, but time is very short (tens of ms); working time has been in the retention hold (at this energy loss is mainly concentrated in the state of retention on iron loss). That is why if they can reduce the AC contactor work retention can save energy consumption, CNC Electric according to this principle, the current energy contacts broadly categorized as follows.
没有评论:
发表评论