Precision Bearings for Micro Motors: KET Applications & Models
In modern engineering, the trend is always moving toward smaller, faster, and more efficient designs. This evolution relies heavily on micro motors. Whether powering an automated ATM machine or a medical instrument, the performance of a micro motor is fundamentally limited by the quality of its internal bearings.
Ningbo Kexiang Bearing Technology Co., Ltd. (KET) specializes in the production of precision micro bearings with an inner diameter of 1-20mm. Our products are widely used in all kinds of micro motors and low noise motors, delivering exceptional rotational stability.
The Demands of Micro Motor Applications
A bearing used in a heavy industrial machine faces different challenges than one used in a micro motor. For micro applications, the primary concerns are strict dimensional tolerances, high-speed capability, and most importantly, acoustic performance.
Strict Vibration and Noise Standards (V & Z Groups)
There are exceptionally high requests regarding the vibration of bearings in motors[cite: 13]. To meet these demands, KET utilizes advanced Automated Vibration Testers.
- Noise Testing (S0910-1): Bearings are evaluated and divided into Z1, Z2, Z3, and Z4 groups based on acoustic emissions.
- Vibration Testing (BVT-1): Bearings are tested and divided into V1, V2, V3, and V4 groups based on mechanical displacement.
For high-end micro motors, sourcing KET bearings graded at Z3/V3 or Z4/V4 ensures that the final motor operates silently and without destructive harmonic resonance.
Common Micro Motor Applications
KET's miniature ball bearings are categorized by their inner diameters to suit various motor sizes and operational requirements:
- Inner Diameter 1-3mm: Ideal for ultra-compact systems. Common uses include cooling fans, micro motors, and high-speed dental drills.
- Inner Diameter 4-10mm: Designed for slightly larger, high-torque applications. Common uses include brushless motors, UAV motors, ATM machines, cash counters, printers, and household appliances.
Specific KET Bearing Models for Micro Motors
To assist our B2B partners in selecting the right components, here is a selection of popular KET metric miniature bearings frequently utilized in micro motor designs. These models are available in both open types and shielded types (ZZ) for dust protection.
| Model (Open / Shielded) | Inner Diameter (d) | Outer Diameter (D) | Height / Width (B/B1) |
|---|---|---|---|
| MR52 / MR52zz | 2 mm | 5 mm | 2 mm / 2.5 mm |
| 682 / 682zz | 2 mm | 5 mm | 1.5 mm / 2.3 mm |
| 693 / 693zz | 3 mm | 8 mm | 3 mm / 4 mm |
| 623 / 623zz | 3 mm | 10 mm | 4 mm / 4 mm |
| MR104 / MR104zz | 4 mm | 10 mm | 3 mm / 4 mm |
| 685 / 685zz | 5 mm | 11 mm | 3 mm / 5 mm |
| 696 / 696zz | 6 mm | 15 mm | 5 mm / 5 mm |
| 608 / 608zz | 8 mm | 22 mm | 7 mm / 7 mm |
*Note: The dimensions provided (Inner Diameter x Outer Diameter x Height/Width) correspond to the technical parameters of KET's metric miniature series
Powering the Future of Compact Engineering
Choosing the right bearing is the most critical decision when designing a micro motor. By leveraging our automated grinding, assembly, and 100% full inspection sorting lines, KET provides motor manufacturers with components that guarantee low friction, optimal thermal control, and Z-group acoustic excellence.
Looking for a reliable supply chain partner for precision miniature bearings? Discover more about our capabilities and customize your order today at KET Precision Bearings.
