Discrete, sensorless, vector-controlled, step-motor drive design suitable for integration or customization ...

a motor-sensed (sensorless) two-phase synchronous or stepping motor controller adaptable to a wide range of power amplifiers. The StepMaster uses low-cost components in a semi-discrete implementation on which  more integrated circuit design can be based. Semi-discrete implementation allows greater circuit observability during design development.

StepMaster motor-drive features:

	Motor-sensed, vector control at high-speed; system microprocessor steps at low speed.
	Digital torque command in, 9-bit current waveforms out.
	Controls two-phase commodity step-motors.
	Phase-winding terminal-voltage sensing for motor-sensed control.
	Sinusoidal current drive with continuous phase sensing down to a few rpm.
	Implemented with 2 dozen low-cost, discrete ICs in 4 ´  5 inch board area.
	Phase (position) feedback and "phase-locked" signals sent to controlling processor.

StepMaster  applies to

	Microcomputer-driven step-motors needing enhanced performance.
	Digitally-commanded, motor-sensed torque control.
	Applications where low-speed motion can be microstepped.
	Microcontroller-based applications.

StepMaster project status:

Design implemented as functional prototype, but based on the ADI ADSP2115 and in need of design modification using a newer processor.