Motion Control
Metis
has been working in motion control for many years. Pritchard designed
and Metis manufactured a micro-stepping stepping motor drive that uniquely
could be tuned to compensate the non-linear characteristics of the motor
magnetic structure. The very unruly, raucous behavior of stepping motors
at resonance was tamed to being virtually unnoticeable. This technology
gave the stepping motor a greater region of operation as defined by
resolution on one end and ultimate speed on the other.
These very smoothly running drives
and motors provided the basis for computer controlled systems. The computer
control of these stepping motor drives demanded a new special purpose
computer architecture. Although independently developed, this architecture
is now known as Harvard. Unlike most computers, the Harvard structure
separates program memory from data memory and provides for more speed.
As an additional speed enhancement, the Metis computer had a separate
register for carry bits. The two features gave the motion control computer
the power to evaluate polynomial equations in less time than the personal
computers could execute a single instruction.
Pritchard has been awarded
11 U.S. Patents for his work in motion control in the areas of motor
driver circuitry, computer architecture, and animation stand control.