The **WJM-106-R** is a specific type of **DC permanent magnet micro motor**, commonly utilized in small electronic appliances, automotive accessories, and precision instruments. Below is a detailed breakdown of its electronic components, technical specifications, and internal structure. --- ### 1. Key Technical Specifications While exact specs can vary slightly by manufacturer (often *Wichai* or similar micro-motor brands), the WJM-106-R typically follows these parameters: | Parameter | Typical Value | | :--- | :--- | | **Input Voltage Range** | 3.0V - 12.0V DC | | **Rated Voltage** | 6.0V or 12.0V (Variant dependent) | | **No-load Speed** | 2,500 - 8,000 RPM | | **Shaft Diameter** | 2.0 mm | | **Rotation Direction** | Bi-directional (CW/CCW) | | **Housing Material** | Zinc-plated Steel / SECC | --- ### 2. Internal Electronic & Mechanical Components The "parts" of this motor work together to convert electrical energy into mechanical rotation: #### A. The Rotor (Armature) * **Windings:** Coils of enameled copper wire. When current passes through, it creates an electromagnetic field. * **Commutator:** A copper ring divided into segments. It acts as a rotary switch to reverse the current direction in the coils as the motor spins. #### B. The Stator * **Permanent Magnets:** Usually two high-strength ferrite magnets fixed to the inner wall of the metal casing. These provide the stationary magnetic field. #### C. The Brush System * **Precious Metal/Carbon Brushes:** These are the "R" (Rare metal) components often denoted in the suffix. They maintain physical contact with the spinning commutator to deliver DC power. #### D. Suppression Components (EMI/EMC) * **Varistors/Capacitors:** Often found soldered across the terminals or internally to reduce electrical noise (sparks) that could interfere with other electronic circuits. --- ### 3. Connection and Pinout The WJM-106-R typically features two solder tabs at the rear: 1. **Positive (+) Terminal:** Usually marked with a red dot or a "+" sign. 2. **Negative (-) Terminal:** Connecting voltage here determines the direction of the shaft. ```python # Simple Python logic for controlling a WJM-106-R via an H-Bridge (L298N) import RPi.GPIO as GPIO # Define pins IN1 = 17 IN2 = 27 def motor_forward(): GPIO.output(IN1, GPIO.HIGH) GPIO.output(IN2, GPIO.LOW) def motor_stop(): GPIO.output(IN1, GPIO.LOW) GPIO.output(IN2, GPIO.LOW) ``` --- ### 4. Common Applications * **Automotive:** Electronic door locks, mirror adjusters, and fuel flap actuators. * **Home Automation:** Smart locks and motorized blinds. * **Personal Care:** High-end electric shavers or massagers.