Closed Loop Stepper Drives. 20-50 VDC Supply Voltage, Max 8A Output Current - SOPROLEC
Nema23 Closed Loop Stepper Motor 2.0n.m 4 Wires 285oz-in D=8mm Nema 23 2.2nm Jmc Close Loop Stepping Motor Servo Stepper Motor - Stepper Motor - AliExpress
Mechaduino- Closed Loop Stepper Servos For Everyone | Hackaday
Jk-Hsd57 2 Phase Closed Loop Stepper Motor Driver - China Stepper Motor Driver and Closed Loop Stepper Controller