The MagnaDrive Adjustable Speed Drive (ASD) works by transmitting torque from the motor to the load
across an air gap. There is no mechanical connection between the driving and driven sides of the
equipment. The torque is created by the interaction of powerful rare-earth magnets on one side of
the drive with induced magnetic fields on the other side. By varying the air gap spacing, the
amount of torque transmitted can be controlled, thus permitting speed control.

The MagnaDrive Technology
MagnaDrive's patented technology uses high power Neodymium-Iron-Boron permanent magnets to create
an induced electromotive force used for torque transfer. The system physically separates the two
elements of the motor system, placing magnet discs on the load shaft and a conductor assembly on
the motor shaft. Motor torque is transferred to the load across an air gap. Varying the air gap
between the magnets and conductor changes the strength of the magnetic field and hence controls
output speed. A portfolio of 20 domestic and more than 200 foreign patents protects MagnaDrive's
technology. Some of the features and benefits of this technology include:

* No-contact power transfer - Eliminates vibration, reduces noise, tolerates misalignment, provides
overload protection, extends motor and equipment life and reduces overall maintenance costs.
* Energy efficiency - Up to 70% audited energy savings in various installations.
* Precise process control - Improves product quality and optimizes process rates.
* Soft start/stop - Reduces the motor's start-up power demands and the resulting brown-outs,
alleviates paying for peak power, allows downsizing of motors, increases motor life and reduces
maintenance.
* Simplicity and ruggedness - System can be maintained in-house and used in harsh conditions.

About the Magnets
Rare earth permanent magnets are an important part of our everyday lives, serving as essential
components in everything from electric motors, computers, production equipment and automobiles. The
magnets are made of a combination of Neodymium, Iron and Boron (NdFeB). Rare earth technology is
the most recent addition to the family of high performance permanent magnets and became
commercially available in the 1980's. NdFeB magnets have the highest energy product of all
permanent magnets, permitting the small size and high torque transmission capability of MagnaDrive
products. NdFeB magnets retain their performance in environments up to 350 Deg. F., and have a
half-life of over 2,000 years.