Suppose I have a typical smallish (say, <3kW) three phase induction motor. Likely 400V star-connected, but methods that work with any motor would be preferred.
I can ensure that the supply phase rotation is in whichever order I like, but would prefer not to need to alter the motor once installed, which will be before power is applied. So guess-and-check once livened is not feasible.
Three phase power is not available during installation, but single phase 230V power could be. I can spin the motor by hand or by power. Reaching operating speed is not required, only enough to determine direction.
How can I identify which way the motor will spin with a given supply phase rotation?
Best Answer
You can probably operate the motor well enough to determine the rotation direction using the Steinmetz connection and a 230-volt single phase power supply. Connect your phase sequence meter for identifying the rotation sequence with respect to the power phase sequence. Here is some information on the Steinmetz connection, more can be found by searching the internet.
Here are diagrams for the Steinmetz connection with a star connected motor:
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