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Vision Magnetoelectricity Technology Co., Ltd.

Established in 2008, located in Dongguan City, Vision Magnetoelectricity Technology Co., Ltd. is a high-tech manufacturer for magnet products, we mai
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  • The application of magnets in fitness bicycles
    09-03 2025
    .gtr-container-m7n8p9 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 20px; box-sizing: border-box; overflow-wrap: break-word; } .gtr-container-m7n8p9 p { margin-bottom: 1em; font-size: 14px; text-align: left !important; } .gtr-container-m7n8p9 .gtr-heading-1 { font-size: 18px; font-weight: bold; margin-top: 0; margin-bottom: 1.5em; color: #0056b3; } .gtr-container-m7n8p9 .gtr-heading-2 { font-size: 16px; font-weight: bold; margin-top: 2em; margin-bottom: 1em; color: #0056b3; } .gtr-container-m7n8p9 strong { font-weight: bold; } .gtr-container-m7n8p9 em { font-style: italic; } .gtr-container-m7n8p9 ul, .gtr-container-m7n8p9 ol { list-style: none !important; margin: 1em 0; padding-left: 0; } .gtr-container-m7n8p9 ul li, .gtr-container-m7n8p9 ol li { position: relative; padding-left: 25px; margin-bottom: 0.5em; font-size: 14px; text-align: left !important; } .gtr-container-m7n8p9 ul li p, .gtr-container-m7n8p9 ol li p { margin: 0; font-size: 14px; text-align: left !important; } .gtr-container-m7n8p9 ul li::before { content: "•"; position: absolute; left: 0; color: #0056b3; font-size: 1.2em; line-height: 1.6; } .gtr-container-m7n8p9 ol { counter-reset: list-item; } .gtr-container-m7n8p9 ol li::before { content: counter(list-item) "."; counter-increment: none; position: absolute; left: 0; width: 20px; text-align: right; color: #0056b3; font-weight: bold; line-height: 1.6; } .gtr-container-m7n8p9 img { max-width: 100%; height: auto; display: block; margin: 15px 0; } .gtr-container-m7n8p9 video { max-width: 100%; height: auto; display: block; margin: 15px 0; } .gtr-container-m7n8p9 hr { border: none; border-top: 1px solid #ccc; margin: 30px 0; } @media (min-width: 768px) { .gtr-container-m7n8p9 { max-width: 800px; margin: auto; padding: 40px 30px; } } The application of magnets in fitness bicycles, particularly in stationary bikes and smart trainers, is a cornerstone of modern fitness technology. It primarily revolves around creating resistance and control, leading to a more effective, versatile, and engaging workout. Here’s a detailed breakdown of how magnets are applied: 1. Magnetic Resistance Systems (The Core Application) This is the most common and significant use of magnets in fitness bikes. Instead of physical contact (like a brake pad), these systems use magnetic force to create resistance. How it works: Components: The system consists of two main parts: A Magnetic Flywheel: A heavy metal disc attached to the pedals. A Magnet (or set of magnets): Positioned close to, but not touching, the flywheel. The Principle of Eddy Currents: When the metal flywheel spins past the magnets, it disrupts the magnetic field. This disruption induces "eddy currents" within the flywheel, which create a magnetic field of their own that opposes the magnet's field. This opposition creates a smooth, consistent drag or resistance on the flywheel, which you feel when pedaling. Key Advantages of Magnetic Resistance: Smooth and Quiet: Since there is no physical contact, the ride is incredibly smooth and almost silent compared to friction-based systems. This is perfect for home use where noise can be an issue. Consistent: The resistance doesn't wear down over time because nothing is rubbing together. A magnet's strength doesn't diminish with use. Precise and Wide-Ranging: The resistance level can be minutely adjusted by moving the magnets closer to or farther from the flywheel. This allows for a very wide range of resistance levels, from very light to extremely heavy. Low Maintenance: With no physical contact, there is virtually no wear and tear on the components, eliminating the need to replace brake pads or adjust calipers. 2. Electromagnetic Resistance (The Smart Upgrade) This is an advanced form of magnetic resistance where the strength of the magnetic field is controlled electronically. How it works: An electrical current is passed through a coil of wire (an electromagnet), creating a magnetic field. By varying the amount of current, the system can instantly and precisely vary the strength of the magnetic field and, therefore, the resistance level. This is what enables the features in modern smart bikes and smart trainers. Applications Enabled by Electromagnets: Automatic Resistance Control: The bike can automatically change your resistance for you based on a pre-programmed workout or instructions from an app. Erg Mode (Ergometer Mode): You set a specific target power (e.g., 200 watts), and the bike will automatically adjust the resistance to ensure you are outputting that exact power, regardless of your cadence (pedaling speed). This is invaluable for structured interval training. Simulation Mode (Sim Mode): When connected to apps like Zwift, Wahoo RGT, or Rouvy, the electromagnets adjust the resistance in real-time to simulate the gradient of the virtual road you are riding. If you hit a steep hill in the game, the bike automatically gets harder to pedal, creating an immersive experience. Electronic Control: Resistance can be changed with the push of a button on the bike's console or remotely via a Bluetooth/Wi-Fi connected app. 3. Cadence Sensors and Speed Sensors Magnets are also used in simple sensors to track performance metrics. A small magnet is attached to one of the pedals or the crank arm. A sensor (often a Reed switch or Hall effect sensor) is mounted on the bike frame nearby. Every time the magnet passes the sensor, it counts a revolution. By counting revolutions over time, the bike can calculate your cadence (RPM - Revolutions Per Minute) and speed. (Note: Higher-end bikes and trainers are now moving towards more accurate, magnet-less cadence sensing using accelerometers and other inertial measurement units, but magnet-based sensors are still very common.) 4. Electric Generators (Dynamos) Some basic magnetic resistance bikes use the rider's effort to generate electricity. As you pedal, you spin a flywheel through a magnetic field. This motion generates a small electrical current (as per Faraday's Law of Induction), which is then dissipated as heat through a resistor. The act of generating this current creates the resistance you feel. This method is simple and cost-effective but is generally less smooth and less precise than dedicated electromagnetic systems. Summary: Benefits to the User The application of magnets translates directly into tangible benefits for anyone using a fitness bicycle: Superior Workout Quality: Enables highly precise, structured training like HIIT, power zone training, and race simulation. Immersive Entertainment: Turns a boring stationary workout into an engaging game or virtual world tour through apps like Zwift. Convenience and Comfort: Quiet operation allows for use anytime without disturbing others. Low maintenance means no hassle. Data-Driven Progress: Provides accurate metrics (power, cadence) to track fitness improvements over time. In conclusion, magnets have revolutionized stationary cycling. They moved it from a simple mechanical activity to a high-tech, connected, and intelligent form of exercise that is more effective, engaging, and enjoyable than ever before.
  • How to replace generator magnets?
    08-26 2025
    .gtr-container-7f3e9a { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 20px; max-width: 100%; box-sizing: border-box; } .gtr-container-7f3e9a p { font-size: 14px; margin-bottom: 1em; text-align: left !important; word-break: normal; overflow-wrap: normal; } .gtr-container-7f3e9a .gtr-heading-level3 { font-size: 18px; font-weight: bold; margin-top: 1.5em; margin-bottom: 1em; color: #222; text-align: left; } .gtr-container-7f3e9a .gtr-heading-level4 { font-size: 16px; font-weight: bold; margin-top: 1.2em; margin-bottom: 0.8em; color: #222; text-align: left; } .gtr-container-7f3e9a hr { border: none; border-top: 1px solid #e0e0e0; margin: 2em 0; } .gtr-container-7f3e9a ul { list-style: none !important; margin: 1em 0; padding-left: 25px; } .gtr-container-7f3e9a ul li { position: relative; margin-bottom: 0.5em; font-size: 14px; text-align: left; } .gtr-container-7f3e9a ul li::before { content: "•"; color: #007bff; font-size: 1.2em; position: absolute; left: -20px; top: 0; line-height: inherit; } .gtr-container-7f3e9a ol { list-style: none !important; margin: 1em 0; padding-left: 30px; counter-reset: list-item; } .gtr-container-7f3e9a ol li { position: relative; margin-bottom: 0.8em; font-size: 14px; text-align: left; counter-increment: none; } .gtr-container-7f3e9a ol li::before { content: counter(list-item) "."; color: #007bff; font-weight: bold; position: absolute; left: -30px; top: 0; width: 25px; text-align: right; line-height: inherit; counter-increment: none; } .gtr-container-7f3e9a ol ul { margin-top: 0.5em; margin-bottom: 0.5em; padding-left: 20px; } .gtr-container-7f3e9a ol ul li::before { left: -15px; } .gtr-container-7f3e9a img { max-width: 100%; height: auto; display: block; margin: 1em 0; border: 1px solid #ddd; box-sizing: border-box; } .gtr-container-7f3e9a strong { font-weight: bold; } @media (min-width: 768px) { .gtr-container-7f3e9a { padding: 40px; max-width: 900px; margin: 0 auto; } .gtr-container-7f3e9a .gtr-heading-level3 { font-size: 18px; } .gtr-container-7f3e9a .gtr-heading-level4 { font-size: 18px; } } Replacing the magnets in a generator (specifically the permanent magnets found in many smaller alternators and brushless generators) is a detailed mechanical task that requires patience and safety awareness. Here is a comprehensive guide on how to do it. ⚠️ Important Safety Warning First High Risk of Pinching/Crushing: The rotor has an extremely powerful magnetic field. It can snap into place with tremendous force, easily crushing fingers or hands. Handle with extreme care. Demagnetization: Striking or dropping a permanent magnet can cause it to lose its magnetic field (demagnetize). Handle the old and new magnets gently. Personal Protective Equipment (PPE): Always wear safety glasses to protect your eyes from metal shards or epoxy, and heavy-duty work gloves to protect your hands. Tools and Materials You'll Need Replacement Magnets: Ensure they are an exact match for your generator model (size, shape, and strength). Workbench with a Vise: To securely hold the rotor. Puller Set (Gear Puller): Often essential for removing the old rotor from the shaft. Heat Gun: A propane torch can work but is riskier (can demagnetize magnets or damage metal properties if overheated). Dead-Blow Hammer or Mallet: To gently tap components loose. Screwdrivers, Wrenches, Sockets: To disassemble the generator. High-Temperature Epoxy (e.g., J-B Weld): For securing the new magnets. Isopropyl Alcohol : For cleaning the rotor surface. Marker or Punch: For marking orientation. Wooden Blocks or Non-Marring Shims: To protect the magnets and rotor. Step-by-Step Guide Phase 1: Removal and Disassembly Disconnect and Secure the Generator: Disconnect the spark plug wire on gas engines or disconnect all battery cables on diesel models. Ensure the generator cannot accidentally start. Gain Access to the Rotor: This typically involves: Removing the generator housing/shroud.    Removing the cooling fan and any air guides.    Unbolting and carefully removing the stator (the stationary coil assembly) from the engine block/rotor. Note the placement of any shims. Remove the Rotor Assembly: The rotor is usually pressed onto the crankshaft and held with a key and a nut.    Use the correct socket to remove the large nut on the end of the shaft.    Use a gear puller to carefully pull the rotor off the shaft. Do NOT hammer on the shaft end or the          magnets themselves, as this can damage the engine's bearings and demagnetize the magnets. Secure the Rotor: Once removed, clamp the rotor securely in a vise. Use soft jaws or wooden blocks to protect it. The shaft should be pointing up. Phase 2: Removing the Old Magnets Mark Magnet Polarity (CRITICAL STEP): Before removing anything, take pictures and use a marker to clearly indicate the North (N) and South (S) pole of each magnet. The alternating polarity (N-S-N-S) is crucial for generating electricity. Getting this wrong will render the rotor useless. Apply Heat: Use a heat gun to gently heat the area around one magnet. The goal is to soften the epoxy adhesive holding it in place. Avoid excessive, concentrated heat which can demagnetize the other magnets. Pry the Magnet Out:    Place a wooden shim or block against the magnet.    Use a mallet to gently tap the shim and work the magnet loose.    You can also try to slide a flat-head screwdriver between the magnet and the rotor, using the shim to protect the metal.    Work slowly and carefully around the magnet until it pops free. Repeat: Repeat the process for all magnets that need replacement. Phase 3: Installing the New Magnets Thoroughly Clean the Slots: Use a wire brush or sandpaper to remove all old epoxy and debris from the magnet slots on the rotor. Finish by wiping the area down with isopropyl alcohol. It must be perfectly clean and dry for the new epoxy to bond. Test Fit the New Magnets: Without any epoxy, ensure the new magnets fit perfectly into the slots. Apply Epoxy:    Mix your high-temperature epoxy according to the instructions.    Apply a generous, even layer to the bottom and sides of the magnet slot.    Also, apply a thin layer to the back of the new magnet. Insert the Magnets with Correct Polarity:    This is the most critical step. Refer to your markings and photos.    Carefully place each magnet into its slot, ensuring the polarity alternates (N-S-N-S) exactly as the old ones were.    The powerful magnetic forces will try to snap them into place. Use wooden blocks to carefully guide them and prevent your fingers from being caught. Let Epoxy Cure: Follow the epoxy manufacturer's instructions for full curing time (usually 24 hours). Do not disturb the rotor during this time. Phase 4: Reassembly Reinstall the Rotor: Once the epoxy is fully cured, carefully slide the rotor back onto the engine's crankshaft, aligning the Woodruff key with its keyway. Reassemble in Reverse Order: Reinstall the nut, washer, stator, cooling fan, and housing. Ensure all wiring connections are secure. Test the Generator: Start the generator and check its output voltage and frequency with a multimeter. It should be within the specified range (e.g., 120V / 60Hz). If the output is low or nonexistent, double-check your magnet polarity. When to Call a Professional Consider hiring a professional generator repair technician if: You are not comfortable with heavy mechanical work. You lack the proper tools (especially the gear puller). The generator is very large or expensive. You are unsure about identifying and maintaining correct magnet polarity. This is a complex repair, but with meticulous attention to detail—especially regarding polarity and safety—it can be done successfully.
  • Why Shall We Need to Custom Neodymium Arc Magnets?
    08-26 2025
    .gtr-container-c7d8e9f0 { font-family: Verdana, Helvetica, "Times New Roman", Arial, sans-serif; color: #333; line-height: 1.6; padding: 15px; box-sizing: border-box; max-width: 100%; overflow-x: hidden; } .gtr-container-c7d8e9f0 p { font-size: 14px !important; margin-top: 0.8em !important; margin-bottom: 0.8em !important; text-align: left !important; line-height: 1.6 !important; } .gtr-container-c7d8e9f0 .gtr-title { font-size: 18px !important; font-weight: bold !important; margin-bottom: 1em !important; text-align: left !important; color: #1a1a1a !important; } .gtr-container-c7d8e9f0 .gtr-subtitle { font-size: 16px !important; font-weight: bold !important; margin-top: 1.5em !important; margin-bottom: 1em !important; text-align: left !important; color: #1a1a1a !important; } .gtr-container-c7d8e9f0 ul { list-style: none !important; margin: 0 !important; padding: 0 !important; } .gtr-container-c7d8e9f0 ul li { position: relative !important; padding-left: 1.5em !important; margin-bottom: 0.5em !important; text-align: left !important; font-size: 14px !important; line-height: 1.6 !important; } .gtr-container-c7d8e9f0 ul li::before { content: '•' !important; position: absolute !important; left: 0 !important; color: #555 !important; font-size: 1em !important; line-height: 1.6 !important; } .gtr-container-c7d8e9f0 dl { margin: 0 !important; padding: 0 !important; } .gtr-container-c7d8e9f0 dt { font-weight: bold !important; margin-top: 1em !important; padding-left: 0 !important; text-align: left !important; font-size: 14px !important; color: #333 !important; } .gtr-container-c7d8e9f0 dd { margin-left: 0 !important; padding-left: 1.5em !important; text-align: left !important; font-size: 14px !important; line-height: 1.6 !important; color: #555 !important; } .gtr-container-c7d8e9f0 img { max-width: 100% !important; height: auto !important; display: block !important; margin-top: 1em !important; margin-bottom: 1em !important; } @media (min-width: 768px) { .gtr-container-c7d8e9f0 { padding: 25px; } .gtr-container-c7d8e9f0 .gtr-title { font-size: 20px !important; } .gtr-container-c7d8e9f0 .gtr-subtitle { font-size: 18px !important; } } Custom Neodymium Arc Magnets – Wholesale Large & Small Curved Magnets Neodymium arc magnets are strong curved rare earth magnets. With unique shape – segment, a set of diametrically arc magnets can be used to form a ring. Arc magnets make up for the shortcomings of ring magnets. They are the most popular shape of permanent magnets and typically used in permanent magnet motors, generators and torque couplings, pumps, magnetic bearing, halbach. What’s more,can you imagine it? It can also be used for Magnetic Nail Polish! What Is the Reason for Using Curved Magnets? Too big neodymium ring is hard to make. Special magnetization direction can’t be made on magnet neodymium ring, such as radiation magnetizing Actual situation needs. For example, rotor and stator are cylinder, having curved magnets will allow magnets get closer to the stator. So it can decrease air gap and increase the flux between them. Specification of NdFeB Arc Magnets: Highest Quality Material: super strong neodymium magnets Multiple Grades: N35UH and N35SH, N40SH, N42SH, N38UH N52M, etc. Here choose more from our Neodymium Arc Magnets Grade. Wide Rang Of Working Temperature: motor and generator will generate a lot of heat and energy in high speed running. So, the built-in neodymium arc magnets have to withstand high temperature in operating, our max. working temperature range from default (up to 80 °C or 176 °F) to AH (230 °C or 446 °F). Durable Plating: to give superior corrosion resistance and provide a smooth and clean finish, arc magnet neodymium needs to be coated. The most common coating on curved magnets is epoxy. Zn and NI+CU+NI triple layer coating are also available. Here choose more from our Neodymium Arc Magnets Coating. Shape Variant: tile, bread, wedge shaped and arched magnets Size Range: 2≤L≤158mm, 3≤W≤90mm, 1.5≤T≤50mm, more details, please contact us directly. Tight Tolerance: ±0.05mm (±0.002”) Magnetiaztion Direction: each magnet’s north and south pole are on opposite flat faces or choose from our Magnetization Direction of Neodymium Arc Magnets. Limitless Uses: the strongest permanent magnet in the world and can provide more powerful, therefore, neodymium segment magnets can be used for a wide variety of projects around the house and industry, including motor, water treatment, wind turbine, nail beauty, camera lens.
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