Varying above frequency this results is smooth increasing and decreasing the spindle speed of motor Tree phase motor. I have one on my wood lathe (3 HP) and could not be happier, not just for the ability to use a three phase motor, but also soft start, dynamic breaking, speed control, and direction control. The Single phase to Three phase converter using IGBT for driving three-phase induction motor by using switching frequency about 7 kHz. The frequency of the driving motor and the driven alternator may not necessarily be the same, 50Hz or 60Hz.įor less than 5 HP, by far the most efficient and easy way to convert 1 phase to 3 phase are the variable speed motor drives out that can be equipped with single phase front ends, and provide variable frequency three phase power. The single phase motor can be a 230 volt or 460 volt motor and the generator can be a three phase generator (alternator) of the desired 3 phase voltage (208, 230, 440, 460, etc.) of the voltage level desired within the limits allowed by the application and in compliance with the code and safety requirements. A single-phase to three-phase power conversion system with parallel rectifier and series inverter to cope with single-phase to threephase asymmetry is. Example: use a 10 HP SINGLE PHASE motor and couple it to drive a 10 HP THREE PHASE generator (alternator). Obviously these will have increasing complexity and associated cost. There are two existing single phase 120/240 panelboards. Lots of low cost devices are on the market.įor larger applications you will probably need to go down the line of rotary converters (where a single phase motor drives a three phase generator) or a more sophisticated inverter design using thyristors and complicated electronics. We are converting a fairly small building from one phase to 208V three phase to accommodate an elevator. It may cause the motor to get a bit hot due to poor phase balancing and so may restrict the power you can get out of the motor. Choose from static and rotary phase converters to accommodate any type of system. You will need to know the power or horsepower rating of the motor in order to determine the correct capacitors. Phase converters quickly convert single-phase AC power to 3-phase AC power. Try looking on Google images and you will see what is going on inside. Single-phase to three-phase converters are available. In three-phase power, the power output is constant. If you look this up in Google you will get lots of hits. Single-phase power is suitable for small household appliances, but because each voltage cycle sees the power drop briefly to zero, three-phase power is required for heavy electrical equipment. Single phase to three phase conversion can be useful only in domestic or in isolated environments.įor small hobby type applications or basic agricultural requirements where you just want to get a small three phase supply to power a lathe, drill, drive belt etc there is a basic device called a static frequency converter.
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