Electric motors power everything from tiny electronics to massive industrial pumps. Yet, they all work on the same basic principles. Though AC motors seem ordinary, there are complex activities going on behind the scenes.

The simplest types of motors are three-phase AC motors. They convert a rotating magnetic field into mechanical rotation. The basic parts of an AC motor are the stator, rotor, bearings, drive shaft, and frame. The supply power is connected to coils of wire that are wrapped around laminated iron cores in the stator; the stationary part of the motor. When the coils of wire receive current, they generate a magnetic field known as poles. Each phase of power has the same number of poles; the poles are spaced evenly around the stator.

Historically, speed control of three-phase induction motors was very difficult. The only way to change the operational speed is to change the frequency of electricity supplied. Today, this task is accomplished by use of a variable frequency drive or VFD. This device is made of three main components: a rectifier, a DC-Link, and an inverter. The rectifier takes the incoming AC voltage and converts it to DC voltage that can be used by the electronics in the VFD. The DC-Link then uses capacitors to help smooth out the DC voltage from the rectifier and feeds it to the inverter.

The inverter then converts the DC voltage back to AC voltage. The inverter also controls the output frequency of the AC power by sending precisely timed pulses of DC power at specific voltages to rebuild the AC sine wave.

With a VFD, not only can the output frequency be controlled, but it can be slowly ramped up. This allows for smoother starting and can be adjusted to keep a motor spinning at a specific frequency. VFDs can produce three-phase power from a single-phase source, or even a DC source, to power highly efficient three-phase motors in locations without a three-phase supply. VFDs can also be incorporated into a PLC system to allow for automatic or remote control.

The combination of a VFD and AC motors offers a wide variety of functions and increased efficiency. Basic understanding of these technologies is essential for any electrician.

Summer colors are abloom with table and floor lamps, wall lights, ceiling light fixtures and fabulous wall décor featuring the finest in stained glass and quality finishing from Meyda Lighting.

Choose from all new Meyda Tiffany designs or build your own craftsman style fixtures and customize decorative stained glass lamps; Meyda Lighting offers the finest in stained glass light fixtures, wall art and home décor.

For over 36 years, Meyda Tiffany has delivered top quality stained glass with a magnificent assortment of table and floor lamps, ceiling pendants, wall sconces and decorative accessories.

Named for its founders “Meyer” and “Ida,” Meyda Tiffany took root when Meyer Cohen built a stained glass window for his wife Ida.  What began as a hobby turned into America’s leading and oldest manufacturer of custom and decorative lighting.

Still a family-run business, Meyda remains committed to providing top quality Tiffany-style products, representing a wide range of fashions from traditional to eclectic.  Through a series of strong cooperative relationships with several small handicraft workshops overseas, Meyda’s designers work closely with quality stained glass studios to ensure a superb finished product.

Ever-expanding to offer luminous and brilliant lamps and decorative accessories, Meyda recently acquired Quality Bent Glass Company (QBG). The originator of many notable stained glass concepts, including the famous Coca-Cola chandeliers, QBG has been seamlessly incorporated into the Meyda Tiffany family.

Meyda utilizes QBG’s original tools, molds and techniques to create nostalgic lighting products much like those offered at Tiffany Studios in NYC in the early 1900’s.

With the purchase of Mecco Art, a metal art studio, Meyda Tiffany further expanded their range with state-of-the-art equipment and novel manufacturing techniques to produce spectacular custom crafted lighting and décor under the Meyda Custom Lighting brand.

Under Meyda Lighting Brand, thousands of decorative styles are offered throughout fine home lighting and home decor dealers in the United States and Canada.

The works of Louis Comfort Tiffany, Dirk Van Erp, Gustav Stickley and other outstanding masters inspires many of Meyda’s lighting designs.  Artistic compositions include Arts and Crafts light fixtures, as well as Rustic, Gothic, Revival and Contemporary lamps and decor.

Meyda’s extensive line encompasses outdoor lighting, too. Wall sconces, stained glass windows, fireplace screens, billiard/kitchen island fixtures, and novelty items are also featured in their repertoire of stylized lighting and home décor.

The creative energy at Meyda is astounding, as new styles and magnificent colors in hand-painted glass continue to enchant and illuminate with the utmost in elegance and sophistication. Meyda continues to implement one of the industry’s most extensive product development programs.

Whether you are searching for a bit of nature in sunflowers, wisteria and dragonflies or a hand-painted flush fixture reminiscent of Van Gogh’s “Starry Night,” Meyda Tiffany will delight your senses with eye-catching illumination.

Special order or choose from a grand selection of table lamps, floor lamps, ceiling pendants, flush fixtures, and wall lights.  Opt for a Tiffany-style table lamp or custom design your signature stained glass kitchen island light with Meyda Tiffany. Now available at 1800lighting.com, Meyda Tiffany is blooming with new summer colors.

The lighting industry has been busy as ever this month, from the slow-climbing successes of LED adoption to the discovery of new galaxies. Have you kept up? Allow us to offer a taste…

It’s only a matter of time before LEDs make serious headway into the retrofit market. Forbes predicts that by 2021, LEDs will make up approximately half of all retrofits in a market where they currently only make up about 5%. Read more…

Cree and Home Depot recently partnered to offer more affordable LED light bulbs to consumers. Nasdaq predicts that Wal-Mart will soon follow, based on a recent announcement from GE about lowering the price of their Great Value LEDs (sold at Wal-Mart). Image via houzz.com

There is an art to proper bathroom lighting, and it involves a lot more strategy than you’d think! For one, this author adamantly believes you should not light a mirror from above because it casts unsightly shadows on your face. Read more…