FD-4 Mini 12V DC Generator Dynamo Motor for Steam & Stirling Engine Models
Hero Section: The Spark Your Model Needs
A steam engine chugging away is satisfying, but a steam engine generating electricity is captivating. The FD-4 Mini Dynamo is the perfect entry-level accessory to transform your mechanical model into a working power plant. Weighing only 57g, this lightweight, compact unit won't bog down smaller engines. Whether you want to light up a miniature street lamp or simply demonstrate the conversion of mechanical energy into electrical power, the FD-4 delivers reliable performance in a package small enough to fit almost any layout.
Why Choose the FD-4 Dynamo?
This unit is a favorite among DIY modelers for its simplicity and versatility.
- Dual-Mode Functionality: It’s a two-in-one device. Drive it with your steam engine, and it acts as a Generator, producing up to 12V to power LEDs. Alternatively, connect a 12V DC power source, and it becomes a high-speed Motor to drive other mechanisms.
- Ultra-Lightweight Design: At just 57g, the FD-4 is significantly lighter than solid brass generators. This low mass makes it ideal for smaller or lower-torque engines (like Stirling engines or small bore steam engines) that might struggle to turn a heavy dynamo.
- Compact Footprint: Measuring only 7.1cm long, it fits easily onto crowded baseplates without dominating the visual aesthetic of your primary engine.
- Reliable Output: Capable of generating approximately 12V at 1A (at peak RPM), it provides ample power for standard model lighting applications or small resistive loads.
Technical Highlights: The Expert’s View
- Low-Friction Shaft: The 2mm shaft is designed to spin freely with minimal resistance. This is critical for model steam engines, as high internal friction in a generator can stall the engine.
- Standardized Voltage: The 12V output is the industry standard for model lighting accessories, making it easy to find compatible bulbs and LEDs without complex wiring.
- Open Frame Cooling: The open metal structure allows for excellent air circulation, keeping the armature cool during extended run times.
Specifications
- Model: FD-4
- Type: DC Motor / Generator Dynamo
- Material: Metal / Composite
- Dimensions: 71mm (L) x 48mm (W) x 63mm (H)
- Weight: 57g
- Shaft Diameter: 2mm
- Generator Output: Up to 12V DC @ ~1A (RPM dependent)
- Motor Input: Up to 12V DC
- Application: Steam Engines, Stirling Engines, Science Experiments
Usage Scenario: The First Light
You have just finished tuning your single-cylinder steam engine. You mount the FD-4 nearby and connect a small rubber belt between the engine's flywheel and the dynamo's pulley. You wire up a single LED. As you open the throttle, the engine picks up speed. The FD-4 spins rapidly, and suddenly, the LED flickers and then glows a steady bright white. You’ve successfully bridged the gap between the age of steam and the age of electricity.
Important Tips
- Pulley Selection: The shaft is 2mm. Ensure you use a pulley with a matching 2mm bore. A pulley that is too large will slip, and one that is too small won't fit.
- Belt Tension: This is the key to success. The belt should be tight enough to spin the generator but loose enough not to stall your steam engine. Experiment with rubber bands or O-rings to find the "sweet spot."
- LED Polarity: If using LEDs, remember they have polarity (+ and -). If it doesn't light up when the engine spins, try reversing the wires or spinning the engine in the opposite direction.
Customer Support
Need help choosing the right size pulley or belt for this dynamo? We are here to assist with your DIY project. Contact our technical support team at service@helloworld7.com
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