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Ships from and sold by Grizzly Average customer review:  (1 customer reviews) |
Product Description
These rotary phase converters allow you to operate 3-phase machinery from a single-phase power source at 100% power and 95% efficiency. Each model operates up to twice its nameplate rating in mixed-motor load. For heavily-loaded or hard-start machinery, such as gearhead lathes, compressors, or dust collectors, choose a nameplate rating 3 times the HP of the most heavily loaded motor. See our individual 3 phase machine pages for specific phase converter recommendations. For application assistance, please call our technical support group at (570) 546-9663. FEATURES: * Cool and quiet operation * Operates 3 phase motors at full power * 95" electrical efficiency * Drip proof cast iron casing * Single or multiple loads * Identical input/output voltagesProduct Details
A rotary phase converter, abbreviated RPC, is an electrical machine that produces three-phase electric power from single-phase electric power. This allows three phase loads to run using generator or utility-supplied single-phase electric power.
Types of RPC
A rotary phase converter may be built as a motor-generator set. These have the advantage that in isolating the generated three-phase power from the single phase supply and balancing the three-phase output. However, due to weight, cost, and efficiency concerns, most RPCs are not built this way.Instead, they are built out of a three-phase induction motor or generator, called an idler, on which two of the terminals (the idler inputs) are powered from the single phase line. The rotating flux in the motor produces a voltage on the third terminal. A voltage is induced in the third terminal that is shifted by 120° from the voltage between the first two terminals. In a three-winding motor, two of the windings are acting as a motor, and the third winding is acting as a generator.
Power quality
A common measure of the quality of the power produced by an RPC or any phase converter is the voltage balance, which may be measured while the RPC is driving a balanced load such as a three-phase motor. Other quality measures include the harmonic content of the power produced and the power factor of the RPC motor combination as seen by the utility. The best phase converter for any application depends upon the sensitivity of device being run to all of these factors. Three-phase induction motors are very sensitive to voltage imbalances.
The quality of three-phase power generated by such a phase converter depends upon a number of factors including:
- Power capacity of the phase converter (idler horsepower rating).
- Power level demands of the equipment being supplied. For instance, "hard starting" loads such as heavily loaded machinery or well pumps may have higher requirements than other loads rated at the same horsepower.
- Power quality demands of the equipment being supplied (CNC equipment may have more stringent power quality requirements than a welding machine)
- Use of techniques to balance the voltage between the three legs.
How RPCs work
The main principles of RPC operation are as follows:
- Three-phase induction motors have three terminals called "legs", usually numbered (arbitrarily) L1, L2, and L3.
- A three-phase induction motor can be run at two-thirds of its rated horsepower on single-phase power applied to any pair of legs, once spun up by some means.
- A three-phase induction motor that is spinning under single-phase power applied to legs L1 and L2, generates an electric potential (and can deliver power through) leg L3, although without some form of current injection, special windings in the idler, or other means the voltage will sag when a load is applied.
- Power factor correction is a very important consideration when building or choosing an RPC. This is desirable because an RPC that has power factor correction will consume less current from the single-phase service supplying power to the phase converter and its loads.
Balanced voltage between the three legs of power is important for operational life of the equipment receiving that power. Unbalanced three-phase power can damage the equipment that it is meant to operate.
Customer Reviews
Most helpful customer reviews0 of 0 people found the following review helpful.
Best Phase Converter Ever By M. Smith
This product is a well built, heavy duty converter. Compared to other brands this is a step above.
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