Rishabh Bahel, C.E.M.

Matthew Derner

18-Oct-2018, 2:30-3:00PM

Session: Four Industrial Approaches to Apply & Save

Track I | Industrial Energy Management

Permanent Magnet Torque Transfer Saves Energy & Improves Reliability by Adjusting Speeds

Rishabh Bahel, C.E.M.
Energy Manager

Matthew Derner
Director of Sales Strategic Accounts



The introduction of Permanent Magnet Adjustable Speed Drives (PMASD’s) has given industry another option to consider for adjustable speed applications

PMASD‘s consist of two primary components. The first component, a set of copper conductor plates, is connected to the motor shaft; the second component of the permanent magnet drive is a rigid assembly

of permanent, rare earth magnets which is connected to the load. During operation, relative motion between the two components creates an eddy current field that transmits torque across the air gap. To adjust the speed of the driven load, the amount of torque transmitted from the motor to its load is controlled by changing the distance between the conductor plates and the magnet assembly. During operation and throughout the entire speed range, no physical connection exists between the

motor and the load. This air gap power transfer has demonstrated vibration reductions up to

85%. The combination of the electrical energy savings and the utility company rebate has produced an ROI of 1.3years. Since the motor now starts uncoupled, the high amperage/torque issues have virtually disappeared with an average daily savings of 1600kWh.

The permanent magnet adjustable speed drive is controlled via 0-100 degree rotary actuator. The system requires a closed loop signal feedback (4-20 mA) connected to a control system where the system will need to control pressure or flow from the PID connected to the fan system. The Beck rotary drive will adjust the magnetic plates ad control torque into the fan which results in speed control to match the process requirements. Control is stable and repeatable to within a few RPM.


Rishabh Bahel received his B.S. degree in mechanical engineering from The Pennsylvania State University in 2012 and is currently pursuing his M.B.A. at Case Western Reserve University. He joined ArcelorMittal Cleveland in 2012 as an associate engineer in the op-tech and maintenance group. He then became project engineer in 2013, and was appointed to his current position of energy engineer in 2015. In this role he leads the plant’s efforts for energy conservation and management. In 2015, he was inducted in the 40 Under 40 Class by Crains Cleveland Business Magazine.


Matthew Derner is the Director of Sales for Strategic Accounts for MagnaDrive Corporation located in Woodinville, WA. A 1995 graduate of North Carolina State University’s Mechanical Engineering Program. Matthew has worked for MagnaDrive for 4 years, living in Dallas, TX. His background includes rotating equipment with an emphasis in energy efficiency and maintenance reliability. Matthew is a proud combat veteran of 2 combat tours with the US Army’s 82d Airborne Division.



Track: I Industrial Energy Management | Session: Four Industrial Approaches to Apply & Save


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