Product Overview
This industrial grade Zinc coated bar magnet features superior magnetic strength, high resistance to demagnetization, and precise dimensional stability. Its elongated block shape provides optimal contact area and secure assembly, making it ideal for efficient torque transfer. Widely used in motors, it enhances energy conversion, reduces size and weight, and ensures reliable performance in high-demand applications such as electric motors, generators, and advanced industrial drive systems.
Technical Specifications
|
Product Name |
Zinc coated bar magnets |
|
Magnet Grade |
N35 (Br ≥11.8 kGs, Hcj ≥12 kOe) |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3,500 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Manufacturing Process
- High-purity rare earth and alloy materials are carefully formulated and melted under controlled conditions
- The alloy is processed into fine powder with controlled particle size and oxygen content
- Powder alignment and compaction are performed under a strong magnetic field to achieve optimal magnetic orientation
- Vacuum sintering and subsequent heat treatment are applied to improve density, coercivity, and thermal stability
- Sintered magnets are machined to precise dimensions according to design requirement
- Surface coatings are applied to enhance corrosion resistance and durability
- Magnets are magnetized under controlled conditions and subjected to full performance and quality inspection
Packaging Procedure & Usage Precaution
Standard Packaging Procedure for Rare Earth NdFeB Magnets
Magnetized products are cleaned and visually inspected before packing
Spacers made of plastic or cardboard are inserted between magnets
Sealed packaging is applied to control humidity and prevent oxidation
Cartons are filled with vibration-resistant materials for transport protection
Shielded packaging is used when magnetic field limits must be controlled
Handling and Application Considerations
NdFeB magnets exhibit high hardness but low toughness
Sudden magnetic attraction can cause edge damage or cracking
Operating temperature limits must be strictly observer
Avoid contact with liquids, acids, or chemical vapors
Proper handling and storage ensure consistent magnetic performance
Frequently Asked Questions:
Q1. How does temperature affect the magnetic performance of NdFeB magnets?
NdFeB magnets experience reversible magnetic loss as temperature increases, and irreversible loss if the operating temperature exceeds the material's maximum working limit. Selecting appropriate grades (e.g., H, SH, UH, EH, AH) and optimizing magnetic circuit design are critical to maintaining performance in elevated-temperature applications.
Q2. What is the difference between intrinsic coercivity (Hcj) and normal coercivity (Hcb), and why does it matter?
Hcj represents resistance to irreversible demagnetization, while Hcb reflects resistance under normal magnetic conditions. In applications with high temperatures, strong opposing fields, or dynamic loads, Hcj is the more critical parameter for ensuring long-term magnetic stability.
Q3. How should flux variation be specified for motor applications?
Flux variation is commonly specified as ±3–5% for high-performance motors. Tighter limits increase sorting cost and may require tighter upstream process control.
Contact Us：
Phone/WhatsApp/WeChat: +86 13829120676
Email: Info@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China.
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