Variable-speed control alternative is 'magnetic'


Seattle, Wa. -A sophisticated, magnetic 'coupling' placed between a motor and its driven load enables variable-speed control of ac motors up to 600 hp at 460 V-as well as medium-voltage (4,300 V) motors. The device is not another version of eddy-current control. MagnaDrive Coupling consists of a copper conductor assembly connected to the motor shaft and a precision rotor assembly (containing rare-earth neodymium-iron-boron magnets) connected to the load shaft. Relative motion between the Nd-Fe-B magnets and copper conductors develops a magnetic field that transmits torque through the air gap between the input and output members-although they are not mechani-cally connected. A linear actuator that re-sponds to 4-20 mA process signals controls torque magnitude by adjusting air gap width. MagnaDrive Coupling offers several bene-fits, such as 'soft' start/stop control, elimi-nation of harmonics and coupling-induced vibrations, and insensitivity to input volt-age/power quality. Ownership and mainte-nance costs are said to be lower, compared to a variable-frequency drive. Initial appli-cation successes have been in speed control of pumps, fans, and blowers.

MagnaDrive Corp.

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Controller programming; Safety networks; Enclosure design; Power quality; Safety integrity levels; Increasing process efficiency
Additive manufacturing benefits; HMI and sensor tips; System integrator advice; Innovations from the industry
Robotic safety, collaboration, standards; DCS migration tips; IT/OT convergence; 2017 Control Engineering Salary and Career Survey
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This article collection contains several articles on how automation and controls are helping human-machine interface (HMI) hardware and software advance.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me