Circuit Necessity

AC induction motors used in many industries are mainly classified into two types: namely, Two phase induction motor and Three phase induction motor.

The two phase power source is well known as AC 100V available at a general household. However, the three phase AC 200V power source is supplied to the air conditioners employed in the shops and factories where the greater power is required.

Accordingly, the two phase AC induction motors are used for the home appliances (refrigerator, electric-fan, ventilator, etc.) which require only a small power. On the contrary, the three phase AC induction motors are used for the greater power application such as plant conveyers, automated warehouse, processing machines, etc. Since the starting current of AC induction motors shoots the peak from five to ten times of the rated current, it is required to suppress such great power demand.

It is the star-delta starter circuit that you can learn here as one solution to suppress such greater power demand discussed above. However, such starter circuit is not required in the practical field unless the AC induction motor has 5.5kW output or more. For application purpose with the star-delta starting circuit, accordingly, only AC induction motors of 5.5kW or greater output are listed in the catalogs of the makers. The induction motor of 5.5kW output also weighs about 90kg thus making it bulky. Since the three phase induction motor employed in this training kit has the out put of only 25W thus making it compact and portable. Even though such small motor has usually three wires, our specially fabricated motor has six wires for the star-delta starter circuit. As a result, we can offer a compact star-delta starter circuit training kit at a largely discounted price.

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