Inkjet DC Servo Motor Emulation via NEMA Stepper Motor (Closed-Loop Conversion)

Technical Specification: Inkjet DC Servo Motor Emulation via NEMA Stepper Motor (Closed-Loop Conversion)1. Project ObjectiveTo design and implement an electronic intermediary system (signal translator) to replace the original DC carriage motor of an inkjet printer with a NEMA stepper motor. The system must guarantee ultra-smooth, resonance-free linear motion and high-fidelity real-time positioning feedback to prevent the printer's mainboard from triggering a Carriage Jam or Fatal Error state.2. Block Diagram and Signal Flow ┌──────────────────────────────────────────────────────────┐
│ INKJET PRINTER MAINBOARD │
└───────────────┬──────────────────────────▲───────────────┘
│ │
[Integrated H-Bridge] [Encoder Input]
DC Motor Power Output Real Position Feedback
(Variable PWM 12V-42V) (TTL Channels A/B 3.3V/5V)
│ ▲
▼ │
┌──────────────────────────────────────────┴───────────────┐
│ INTERMEDIARY TRANSLATOR CIRCUIT │
│ │
│ ┌────────────────────────┐ Isolation ┌────────────┐ │
│ │ Motor Signal ├─────────────>│ │ │
│ │ Conditioner (Opto/Div) │ Direction │ │ │
│ └────────────────────────┘ │ │ │
│ │ ESP32 / │ │
│ ┌────────────────────────┐ Channel A/B │ STM32 │ │
│ │ Original Encoder ├─────────────>│ (MCU) │ │
│ │ Signal Conditioner │ Interrupt │ │ │
│ └────────────────────────┘ │ │ │
│ │ │ │
│ ┌────────────────────────┐ PUL / DIR │ │ │
│ │ Trinamic Driver │