The 2-Channel Universal Stepper Motor
Controller (USMC) provides two configurable stepper motor drive
circuits, suitable for driving either two independent stepper
motors or one dual-redundant stepper motor pair.
The 4-Channel Electronic Control Unit
(ECU) is capable of driving four independent brushless DC
motor windings and is capable of interfacing with a resolver for
position feedback and motor commutation.
- The heart of the ECU is an FPGA-based controller board. Three
FPGAs provide the control logic as well as perform functions such
as servo control, process input commands and generation of Pulse
Width Modulated outputs.
- The ECU contains two electrically isolated sections. The motor
drive circuitry is connected directly to the 28 VDC power bus,
which is isolated from chassis ground. The low-level logic
circuits, including the FPGA's and telemetry, are tied to chassis
ground, and are connected to the motor drivers by high-speed