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American Rotary Advantage


Phase Converters...

Phase Converters convert single phase power to industrial 3-phase power. Different types of phase converters exist, and they each have a certain method to achieve the conversion. Because American Rotary offers every type of phase converter available...Rotary, Digital, CNC, and can always be sure that we will recommend the method that is preferred for your specific application!

Rotary Phase Converters are a cost-effective and efficient means to start and run 3-phase motors on single phase power at 100% of their rated horsepower. Rotary phase converters can be used with heavy loads, resistive loads, multiple motor loads, multiple speed loads, and CNC equipment.

American Rotary Advantage

Company Reputation

American Rotary is a UL Certified Control Panel Builder, and our phase converters can be purchased with UL Listing Certification. Our induction generators are custom manufactured to our specifications in the USA by Baldor Electric, who remains one of the world’s largest and most well-respected manufacturers. American Rotary is listed with Dun & Bradstreet, is an active member of the Better Business Bureau, and strictly adheres to Truth in Advertising, ethics, and privacy standards.

Product Innovations/Advancements

For more than 10 years, American Rotary has led the industry in innovation and design. We have introduced, field-tested, and proven several technologically advanced features which have driven increases in the reliability and precision voltage balancing capabilities of phase conversion unmatched in the industry.

  • American Rotary generators are available with a digital controller, which replaces electro-mechanical relays to more reliably and precisely start the phase converter while constantly monitoring voltage and making automatic adjustments when necessary. This industry-changing advancement not only provides critical protection to the starting circuit, induction generator, and equipment, but also balances the voltage so precisely that our phase converter is preferred by high-end equipment manufactures and many regional and state power companies.
  • The engineers at American Rotary worked with the engineers at Baldor for over a year designing a custom induction generator for phase conversion, which reduced the inrush current on start-up so drastically (83% reduction...a stock motor requires 600% more inrush) that American Rotary's induction generator was granted a Soft Start rating, and a resulting reduction in operating cost!
HP 3 5 7.5 10 15 20 25 30 40 50 60
Idle Power <1¢ 1.5¢ 12¢ 15¢ 18¢

Voltage Balance Testing Claims

The load range is very important when verifying voltage balance claims. A claim of 2% voltage balance may be true for a very limited operating condition, but won't exist for your application under load, even with field adjustments. This is especially true for stock or modified TEFC or ODP motors. American Rotary precision balances all CNC units over 100% load of the phase converter. In addition, our custom Baldor induction generators are wound with ISR magnet wire, which makes them immune to current spikes common in CNC equipment. Some companies offer motors from more than one manufacturer to go with their phase converter panel. However, different brands and different types of motors balance differently.

Induction Generator vs TEFC and ODP Motors

There are many differences between American Rotary’s Phase Converter Induction Generator and stock or modified TEFC and ODP electric motors. We have constructed the following table to summarize the most critical differences.

Induction Generator TEFC/ODP Motors (Stock or Modified)
Designed to deliver superior voltage and current balance required for phase converter applications, and it is 98% efficient Designed to provide torque for a load on its shaft, making it less efficient, and diminishing its ability to attain precise voltage balance. 
Soft Start rating granted by reducing inrush current (and operating cost) by 83%. Requires 600% more inrush current to start and cost more to operate.
Manufactured without an exposed rotating shaft. Manufactured with an exposed rotating shaft that must be removed for safety, which causes physical imbalance, and may cause bearing failure and/or void the motor manufacturer’s warranty.
Designed to operate at synchronous speed indefinitely, which means you can safely leave your phase converter running at idle.   Not designed to operate at synchronous speed for long periods without a mechanical load on the shaft.
Run quietly and stay cool while optimizing voltage and current balance. TEFC motors have large cooling fans that produce noise and rob power to stay cool, which further reduces its ability to balance voltage.
Manufactured to our specifications by Baldor Electric 100% in the USA. Manufactured in China (Worldwide Electric, Leeson), Brazil (Weg), and Taiwan.

Important Safety Warning

Do not buy a stock TEFC or ODP motor with an exposed rotating shaft. It is a known safety hazard and can cause serious injury. Insurance companies may consider injuries from an exposed rotating shaft a form of negligence. Please verify before you buy!

Quality of Construction

American Rotary utilizes 100% stress-free mounts on all components. Any electrical product that has any components, especially capacitors (usually silver or black cylinder-shaped parts inside the panel), that are mounted with banding of any kind should be avoided. Banding (tension mounting) is an inexpensive way to mount capacitors and other components, but severely shortens their life by causing damage to the outside of the capacitor. Weakening the casing eventually leads to leaking and ultimately, failure.

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