Magnetic bearings, high-speed motors and generators technology blog RSS feed, Synchrony http://www.synchrony.com/ Active magnetic bearings, high-speed motors and generators, high-frequency drives, and direct-drive solutions blog from Synchrony. en-us Copyright 2009 Synchrony Synchrony http://www.synchrony.com/images/logo.gif http://www.synchrony.com/ <![CDATA[Dresser-Rand to Acquire Synchrony]]> As was reported in a recent press release, Synchrony Inc. has reached an agreement to be acquired by Dresser-Rand. We expect that the acquisition will be completed in January 2012, and I would like to provide you now with some details about our plans for the future.

First of all, our current business activities will continue in their present form after the planned acquisition. We value our relationships and we will continue to provide our customers with leading technology, quality, and service. Synchrony will continue to offer our magnetic bearings, high-speed motors and generators, and power electronics in the defense, HVAC, industrial process, water/wastewater, and renewable energy markets.

After the planned acquisition by Dresser Rand, Synchrony's current management team will remain in place and I will continue to lead the business unit. All of our employees will be retained--we recognize that the value that Synchrony offers its customers is derived from the talent and commitment of our employees. Synchrony's main operations will remain in Roanoke, Virginia.

The combination with Dresser-Rand will allow us to better serve our customers. Dresser-Rand is recognized globally as a leading supplier of rotating equipment products and services. Its extensive resources and international presence will allow us to more quickly identify and exploit new opportunities with our partners.

The planned acquisition will also allow us to expand our offerings in the magnetic bearings are used to improve rotating machinery that conventionally use oil-lubricated bearings. However, it is possible to take things one step further by making a rotating machine ULTRA-reliable. This is done by incorporating redundant elements in the magnetic bearings such that the bearing continues to operate even if one or more elements in the bearings were to fail (fault). A bearing with that level of protection is referred to as "fault tolerant."

Elements of a magnetic bearing system include electromagnets, sensors, digital processors, power amplifiers, and cabling. Synchrony's approach to fault tolerance is to design highly integrated systems that have multiple processors, redundant sensors, and extra electromagnets connected by cables to matching power amplifiers. Upon a failure of a component, the fault tolerant magnetic bearing automatically re-configures itself and continues to operate. Using an innovative architecture, fault tolerance is achieved with only a modest increase in size and cost of the overall magnetic bearing system.

Where would this level of protection be necessary?

Originally, this architecture was developed for the US Air Force for next generation aero-engine applications. Industrial applications can also now benefit from this technology, including large turbomachines found in the Oil & Gas and Power Generation sectors. Some examples include applications where downtime is extremely expensive (such as compressors used in petrochemical plants) and applications where a machine is difficult or impossible to service in the event of a failure (such as subsea compressors). Fault tolerance allows the rotating machine to continue to operate until maintenance can be scheduled. Magnetic bearings can help achieve a level of reliability never before possible.

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<![CDATA[Governor Bob McDonnell Comes to Synchrony]]> Virginia Governor Bob McDonnell recently visited Synchrony to learn more about our company, our products, and our customers. After a briefing with management, he toured our research and production facilities and had a chance to informally chat with employees before giving a public speech that was covered by the local media.

I was impressed with his genuine interest in our company, as well as his quick understanding of the basic technology. In his public comments, he cited the broad applicability of our technology and his desire to see our company continue to grow.

Other attendees included local government officials and executives from Daikin-McQuay and Dresser-Rand -- two of our valued partners.

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<![CDATA[Magnetic Bearings Can Help Heal Energy Woes]]> Today, there is much public attention placed on reducing the amount of fossil fuel we burn for reasons of energy independence, economics, and environmental sustainability. There are several ways to reduce burning of fossil fuels:

  • Displace fossil fuels with other sources of energy, such as nuclear, wind, geothermal, and solar
  • Reduce the consumption of energy by reducing energy-intensive activities
  • Improve the utilization of energy by increasing the efficiency of machines and processes

Improved efficiency is the low-hanging fruit because it typically does not involve radical changes in our energy infrastructure. For instance, according to NEMA, electric motors account for nearly 70% of the electricity consumed in the U.S. industrial manufacturing sector. Many of those motors drive turbomachines such as pumps, blowers, and compressors commonly found in industrial processes. Even small efficiency improvements translate to large reductions in energy consumption. Magnetic bearings and high speed motors can help to reduce the energy consumption in your factory in these ways:

  • Reduce bearing losses. Using magnetic forces to support and position rotating shafts eliminates the viscous friction from lubricants in motors and turbomachines.
  • Eliminate gearbox losses. Directly connecting a high speed motor to a high speed turbomachine eliminates the power consumed by gears, bearings, and pinions.
  • Improve aerodynamic efficiency. Increasing the speed of the turbomachine and allowing the speed to vary with operating conditions improves the overall aerodynamic efficiency of the turbomachine.

These improvements in efficiency have been already accepted in applications such as refrigerant compressors and aeration blowers, where efficiency improvements greater than 10% are achievable.

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<![CDATA[Air Bearings or Magnetic Bearings?]]> I am often asked about the tradeoffs between using air bearings and magnetic bearings for high speed applications. After all, both are non-contact, oil-less solutions that can improve the performance of rotating machinery. Air bearings also seem less complicated because they don't require active electronics to operate.

I believe that certain applications can benefit from using air bearings instead of magnetic bearings, especially for smaller machines in contamination-free environments (e.g. laboratories). Indeed, in my career, I have helped to develop highly-specialized, small, high speed turbomachines on gas-lubricated bearings. However, some of the limitations of air bearings that preclude their use from a broader range of applications include:

  • Limited damping. The vibrational characteristics of a rotating machine close to or at its critical speeds (resonances) are determined by the amount of damping (dissipation) introduced by the bearings. A magnetic bearing can electronically optimize this damping to reduce the vibration at critical speeds. An air bearing will typically have much less damping, which will restrict the operating speed range of the machine, and may require a more complicated balancing process.
  • Manufacturing tolerances. The forces in an air bearing are created due to the small clearance between the rotating and stationary surfaces, often times less than 0.001 in for a journal diameter of about 1 in. Because bearing forces are reduced at larger clearances, it is necessary to maintain this small clearance even for much larger shafts. The net result is that it becomes difficult or impossible to manufacture the bearing for larger machines with the required precision. The clearances in a magnetic bearing are between 10 and 20 times larger, which make them suitable for larger machines.
  • Intolerance to contaminants. Because of the very small clearances, the performance of the bearing is adversely affected by contaminants in the air. This precludes use of the air bearing in many industrial environments unless special provisions are made to ensure the environment surrounding the air bearing is clean. The performance of a magnetic bearing is relatively insensitive to these contaminants.
  • Load capacity varies with speed. For typical operating conditions, t]]> <![CDATA[Congressman Goodlatte Visits Synchrony]]> On Monday, January 11, 2010, Congressman Bob Goodlatte visited Synchrony. The congressman had a chance to view our facility and chat with many of our employees. He continues to help spread the word about the new things happening at Synchrony. The McQuay facility in Staunton, Virginia, is also in Congressman Goodlatte's district, so our work in the HVAC industry has special significance to him.

     

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    <![CDATA[Synchrony Op-Ed in IndustryWeek]]> An op-ed article that I submitted to IndustryWeek was published on January 13. The article focused on how magnetic bearings offer a new way for companies to save money by reducing energy consumption and maintenance costs while also providing environmental benefits. Unlike so many other “green” technologies, our “clean” magnetic bearings, high speed electrical machines, and high frequency power conversion systems are available today at price levels that are competitive with “dirty” oil-lubricated systems. This article follows a recent article in the New York Times on our Fusion® bearings. We are thrilled to see our message getting out to a much broader audience.

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    <![CDATA[The New York Times features Synchrony and FusionĀ® magnetic bearings]]> This Sunday, The New York Times ran a story on Synchrony and our Fusion® bearing. The reporter, Anne Eisenberg, did a wonderful job explaining magnetic bearings to the general public and how the Fusion bearing is different from other types of magnetic bearings. The article also included insightful comments from Eric Maslen (University of Virginia), Dave Trumper (MIT), Bill Pizzichil (Baldor), and Jigger Jumonville (Atlas-Copco consultant).

    The article ran on Sunday, January 3, 2010, and by Monday night we have had well over 2000 visits to our synchrony.com web site, including many inquiries regarding our products and our company. Many that have contacted us share our belief that the acceptance of magnetic bearings is accelerating due to improvements in simplicity, size, performance, and value.

    It is certainly an exciting time to be at Synchrony.

    The entire article is available Online here.

     

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    <![CDATA[Magnetic Bearings in HVAC Compressors]]> Daikin McQuay recently introduced its model WME "frictionless" chiller with Synchrony's magnetic bearings in the size range of 400 - 550 tons. This compliments a smaller "frictionless" chiller that McQuay has been supplying for several years and which has enjoyed success in the HVAC market. We have begun to supply McQuay with 150 drive trains as part of an expected order for 500 drive trains. These 500 drive trains follow an initial run of 75 units that have already been produced. Clearly, this marks an important milestone for Synchrony as well as for the magnetic bearing industry.

    Electrically-driven compressors that use magnetic bearings, high speed motors, and high frequency power converters offer efficiency, reliability, and environmental benefits compared to oil-lubricated systems that use fluid-film bearings, 3600-rpm motors, and gears. What makes Synchrony's products especially attractive for these applications is our focus on performance, simplicity, size, and value (see The Synchrony Manifesto). Ultimately, this translates into increased market penetration for the OEM and lower life cycle costs for the end user.

    We at Synchrony believe that the remarkable technology shifts that we are seeing in the HVAC industry will also take place in other industries. External factors such as higher energy costs and higher costs of environmental regulation will accelerate the acceptance and penetration of magnetically-supported rotating machinery. Although the Oil and Gas industry currently accepts magnetic bearings for certain classes of machines, the number of turbomachines supplied on m]]> <![CDATA[Expect More Pumps on Magnetic Bearings]]> At Synchrony, we are passionate about massively increasing the use of magnetic bearings for a broad range of applications. We believe our approach to improving the performance, simplicity, size, and economics allows the machine designer to use magnetic bearings for applications that were previously not feasible. One example is pumps, which are found in large facilities such as oil refineries in quantities of thousands. Bearing failures currently limit the reliability and life of pumps for many applications. There are many other opportunities for magnetic bearings to pay dividends in pumps.

    At Synchrony, we have seen increased interest in using magnetic bearings to replace oil-lubricated bearings in pumps. For pumps currently supported on ball bearings, magnetic bearings offer improvements in machine vibration and reliability. For pumps supported on fluid film bearings and fed with pressurized oil, magnetic bearings allow the complete elimination of the oil lubrication system, including the oil reservoir, pumps, filters, heat exchangers, and piping. Often, the economics to replace a fluid-film bearing with magnetic bearings can be justified solely on the acquisition cost of the oil lubrication system. In addition, magnetic bearings offer higher efficiency, improved control of vibration, reductions in maintenance, improvements in reliability, and elimination of the cost and hazards of handling, storing, and disposing of oil.

    Synchrony's Fusion® bearings were designed to be easily integrated into machines such as pumps and motors. With all the control electronics embedded into the bearing, the requirements for wiring, connectors, and space for an external controller are all greatly diminished. Available in a range of standard sizes, the task of retrofitting an existing machine or integrating into a new machine is greatly reduced in scope and cost.

    For a pump that is driven by an electric motor, the motor rotor can also be supported on magnetic bearings. The entire machine train can now be completely free of oil, and the efficiency, vibration, r]]> <![CDATA[The Synchrony Manifesto]]> Clean. Efficient. Reliable. These attributes are often used to describe magnetic bearings. With no need for lubricants, with no mechanical wear or friction, and with the capability to tailor bearing characteristics to optimize performance, it's no wonder that there's growing excitement about using magnetic bearings in high performance machinery. This is especially true today, where there is much focus on improving the utilization of energy using eco-friendly technologies.

    The truth is, the advantages of magnetic bearings have been known for a long time. The principle of using electromagnets, sensors, and active electronics to suspend objects without mechanical contact was demonstrated by Jesse Beams at the University of Virginia back in the 1950s. Despite the long history of magnetic bearings, today only a small fraction of rotating machinery is supplied with magnetic bearings. What's the reluctance towards the widespread use of this technology?

    We believe that in the past, the acceptance of magnetic bearings was impeded because the bearings did not meet basic engineering criteria related to performance, simplicity, size, and cost:

    Performance. Magnetic bearings must be unconditionally stable for just about any operating condition of the host machine. This includes conditions of high dynamic loading caused by surge, stall, ingestion of liquid slugs, cavitation, motor electrical faults, and other transient conditions.

    Simplicity. Magnetic bearings must be easily integrated into new and existing designs of rotating machinery. To facilitate this integration, the bearings should be offered in standard sizes, be easy to mechanically and electrically integrate into the machine, and be accurately modeled using standard techniques. Additionally, the bearings should be simple to optimize and operate, and interface with other plant systems for process control, health monitoring, and trending. The size, quantity, and length of cables between the controller and the magnetic bearings should be kept to a minimum. The overall complexity of the magnetic bearing should be hidden from the mac]]>