Something Old + Something New = An Exciting New Branch of Motor Technology
Digital Power Engineering's new, patent pending, Resonant Field Exciter technology enables one of the oldest motor technologies, the wound field synchronous motor, to compete head to head with copper rotor induction, permanent magnet and switched reluctance motors for high effeciency applications, and do so without specialized drives or supply chains that stretch half way around the planet.
IE4 motor effeciency, without magnets or inverters
The wound field synchronous motor has been the motor of choice above 400 HP for over 100 years, but it's been conspicously absent in discussions of how to achieve IE4 motor effeciency performance.The Resonant Field Exciter changes all that, enabling direct line connected IE4 operation with no inverter. All with a motor mounted device as small as 2 cubic inches per HP running at 1/30 to 1/40 the shaft power of the motor. READ MORE
A magnetless, high effeciency, variable Ke brushless motor
For maximum effeciency variable speed applications, grid connected or not, the permanent magnet synchronous or BLDC motor connected through a pulse width modulated drive has dominated. Unlike the BLDC, the Resonant Field Exciter on a wound field synchronous motor provides completely independent control of rotor flux, thus realizing a variable Ke motor with rotor flux independently adjustable over a range of 4:1 or more. High torque/ low speed and high speed/ low torque in the same motor with the worlds siimplest drive is achievable. READ MORE
Variable speed electric motion with minimal EMI and bearing degradation.
As electric motion has become more complicated over the last 30 years, the Law of Unintended Consequences has taken its toll. Undesirable side effects such as electromagnetic interference (EMI), bearing degeneration and motor insulation breakdown have reared their ugly heads. The Resonant Field Exciter on a wound field synchronous motor driven by the world's siimplest drive minimizes or even eliminates all that by simply avoiding the problem. READ MORE
But why stop at motors?
Since the Resonant Field Exciter provides independent control of the rotor flux, increasing the flux above the level where it equals the stator flux turns the wound field synchronous motor into a wound field synchronous generator. For back driven applications like traction or hoisting, this means a simple way to implement regenerative braking. READ MORE
For Prototype and Licensing Information Contact:
Gary Box
Digital Power Engineering
612-834-6493
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