The **WJM-165-R** is a specific electronic component, typically categorized as a **Micro DC Motor with an integrated Encoder/Gearbox assembly**, often used in precision robotics, office automation (like printers), and small medical devices. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. General Specifications The WJM-165-R is designed for high torque at low speeds while providing feedback for position control. | Feature | Specification (Typical) | | :--- | :--- | | **Motor Type** | Brushed DC Motor | | **Nominal Voltage** | 12V - 24V DC | | **No-load Speed** | 150 - 170 RPM (Variable by model) | | **Gear Ratio** | Internal reduction gears (often 1:30 to 1:100) | | **Feedback System** | Incremental Magnetic or Optical Encoder | --- ### 2. The Encoder System (Electronic Feedback) The "R" suffix often denotes the inclusion of a rotary encoder. This is the most critical electronic part for automation. * **Pulse Per Revolution (PPR):** Usually generates 11 to 16 pulses per motor revolution (before the gearbox reduction). * **Channels:** Dual-channel (Phase A and Phase B). This allows the controller to determine both **speed** and **direction** (Quadrature encoding). * **Operating Voltage ($V_{cc}$):** Typically 3.3V or 5V DC, independent of the motor power. --- ### 3. Pinout and Connection Standard WJM-165-R units usually feature a 6-pin JST connector. | Pin Number | Label | Function | | :--- | :--- | :--- | | 1 | **Motor +** | Positive power for the DC Motor | | 2 | **Motor -** | Negative power for the DC Motor | | 3 | **Encoder GND** | Ground for the sensor circuit | | 4 | **Encoder VCC** | 3.3V / 5V Supply for the sensor | | 5 | **Signal A** | Phase A output (Square wave) | | 6 | **Signal B** | Phase B output (Square wave) | --- ### 4. Typical Applications Due to its compact size and feedback capabilities, it is found in: 1. **ATM / POS Terminals:** For precise paper feeding or card movement. 2. **Robotic Arms:** Where specific angular positioning is required. 3. **Smart Locks:** For driving the deadbolt with stall detection. 4. **Medical Pumps:** For metered fluid delivery. --- ### 5. Control Circuit Requirements To operate this part effectively, you need: * **H-Bridge Driver:** (e.g., L298N, DRV8833) to control the direction and speed via PWM. * **Microcontroller:** (e.g., Arduino, ESP32) to read the encoder pulses and calculate the PID loop for positioning.