Single-phase motors

Let’s examine the terminal box of the single-phase hermetic compressor below. The “klixon” circuit breaker protecting the compressor against accidental overheating can be seen, and the three motor terminals are indicated as 1, 2 and 3...

If all wires are disconnected, an ohmmeter will show, for example, the following readings :

	Between 1 et 2 : 11 W
	Between 1 et 3 : 3 W
	Between 3 et 2 : 14 W

 Note: use a low range (e.g. 200 W) as the resistances in these small motors are at most only a few tens of Ohms.

EXERCISE : make a sketch of the internal wiring of the motor yourself before looking the solution

(Solution : Refribase Manual pages 253 to 264)

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