The beginning and end of a three-phase motor winding speed judgment circuit

Posted on Dec 11, 2010

FIG aa, bb, and ce three-phase windings, respectively. Double throw switch Kl-l ~ Kl-4 hit the left side, that switch l and 2 phase, at this time, aa and bb in series with the

The beginning and end of a three-phase motor winding speed judgment circuit
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secondary of the transformer T, 6 3V small bulb ZD and connected to ce ends. If a and b are all connected winding aa and bb head or tail, then when the button is pressed A t, induced current, ZD luminous winding ce in. Conversely, if a and b are not the end of the same name, then aa and bb magnetic field generated by the mutual offset, ce no induced current, ZD does not shine. Accordingly, we find out aa and bb end of the same name. When KH-Kl-4 and hit the other side, that the switch 3 and 2 phase, the figure shows, this time bb and ce just swap each other. In this case, if press N, the same way you can draw aa and ce the dot end. Thus, as long as the Kl-l ~ Kl-4 down once, then uh distinguish the head and tail of three-phase windings. Real intertemporal use, first with a multimeter to find out which of the two windings are heads, then any of the windings connected to aa, bb and inter-cc can be.

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