High power motors: Nanocrystalline cores reduce over voltage

Nanocrystalline cores are designed for use in high power inverter systems and turbine generator drives. See photo.


Iron-based nanocrystalline is a soft, magnetic material that reduces build volume on ac and dc motors.

Iron-based nanocrystalline is a soft, magnetic material that reduces build volume on ac and dc motors. Source: MH&W

Mahwah , NJ –  MH&W International has introduced Magnetec Cool Blue nanocrystalline cores for use as common mode chokes to reduce the build volume of damaging motor bearing currents in high power inverter systems and turbine generator drives. Cool Blue cores also suppress asymmetrical EMI currents generated by the parasitic currents of motors and their cables. The result is increased service life of motor bearings, and reduced maintenance and stoppages, according to the company.
MH&W International Corp. provides magnetics solutions, including toroids and other products to the telecommunication and power supply industries. Cool Blue toroid cores are typically placed over the hot legs (L1-L2-L3) of a motor drive cable assembly. To serve as common mode chokes, one or more cores are placed over the connector cables in the DC-link as well as at the inverter output. Typical applications are on high power motors and wind power generating equipment. The cores are said to be easily adapted to retrofit maintenance operations, as well as to new installations.
Iron-based nanocrystalline is a soft, magnetic material that the company says provides performance superior to permalloys, ferrites and other materials when it comes to effectively reducing build volume on switched power converters and on ac and dc motors. Cool Blue cores provide a wide range of permeability, 25,000-90,000 at 10 KHz, and a saturation flux density of 1,200 mT.

MH&W’s Cool Blue nanocrystalline cores are available in a range of M-type sizes including both round and oblong shapes. The smallest core for high power motor applications has an outside diameter of 63 mm and inside diameter of 50 mm. The largest core has a 500 mm OD and 450 mm ID. The standard thickness of all Cool Blue cores is 30 mm. Prices start at $40 per piece for the 63 mm OD size in 100 piece quantities.


– Edited by Renee Robbins , senior editor
Control Engineering News Desk
Register here to select your choice of eNewsletters free.

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Raising the standard: What's new with NFPA 70E; A global view of manufacturing; Maintenance data; Fit bearings properly
Sister act: Building on their father's legacy, a new generation moves Bales Metal Surface Solutions forward; Meet the 2015 Engineering Leaders Under 40
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Upgrading secondary control systems; Keeping enclosures conditioned; Diagnostics increase equipment uptime; Mechatronics simplifies machine design
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Building high availability into industrial computers; Of key metrics and myth busting; The truth about five common VFD myths

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.