Products
Robot Joint Armature
Robot joint Armature | High magnetic conductivity dynamic core components | Efficient magnetic conduction and fast response
| Ensure precise control of the joint brake and clutch
Product Brief
As a manufacturer with core technology in the field of high-performance soft magnetic moving parts processing, we focus on the comprehensive precision manufacturing of robot joint armature, which are key action execution components of robot joint brake systems. We provide full-process machining solutions from high-performance soft magnetic materials to surface treatment, covering the precision machining of armature components in various electromagnetic brakes and clutches. We deeply understand its key role in magnetic circuit closure, torque transfer, fast response, wear resistance and long-term reliability, as well as the stringent requirements for magnetic conductivity, flatness, parallelism, dimensional stability and dynamic balance, and are committed to achieving excellent magneto-mechanical conversion efficiency, exceptional action consistency and long service life through precision machining and special heat treatment technology.
Core Advantages
1. Integrated processing of high-precision magnetic road contact surface and moving structure
① Precision grinding of the contact surface of the yoke at the nanoscale flatness
The flatness of the contact surface between the armature and the yoke is ≤0.003mm (≤0.005mm) using high-precision surface grinding machine and special grinding process. , surface roughness 𝖱𝖺𝗌𝗈.𝟦μ𝗆 , to ensure that the magnetic circuit is tightly closed, the magnetic resistance is minimized, and the electromagnetic suction force and response speed are improved.
② Lightweight thin-walled structure anti-deformation processing
For the common thin-walled disc or special-shaped structure of iron core, vacuum suction cup fixture and symmetrical milling process are used to achieve a thickness tolerance of ±0.02mm and a flatness stability of ≤0.005mm, which ensures the rigidity of the structure while achieving lightweight and low inertia.
③ The guide structure and mounting hole system are precision machined
The guide rod mounting hole, return spring mounting position and connecting thread hole of the armature are precisely machined to ensure that the position degree is ≤ Φ0.02mm and the verticality is ≤0.01mm, which provides precise guidance for the linear reciprocating motion of the armature and avoids bias and jamming.
2. High-performance soft magnetic material treatment and optimization
① Special heat treatment of materials with high magnetic conductivity and low coercivity
Hydrogen protection annealing or vacuum annealing of mild steel (such as 10#, 20# steel) or electrical pure iron (DT4 series) core blanks eliminates processing stress, refines the grains, reduces the coercivity (Hc) to ≤80A/m, and increases the maximum permeability (μm) to ≥3000 to ensure excellent soft magnetic performance.
② Anti-rust and insulating coatings are precisely coated
High adhesion epoxy insulation coating or phosphating treatment is applied to the non-working surface of the iron core, with a thickness of 10-20μm, which not only prevents rust, but also avoids heat generation and efficiency degradation due to eddy currents in high-speed on-off.
③ Working surface hardening and wear-resistant treatment
High-frequency quenching, nitriding or laser surface strengthening treatment is carried out on the working surface in contact with the friction plate to form a thin layer with a hardness ≥ HRC50 and a depth of 0.1-0.3mm, which greatly improves wear resistance and ensures good magnetic conductivity in the core.
3. Dynamic performance and reliability enhancement
① Dynamic balance correction ensures smooth high speeds
Precise dynamic balance correction is carried out on the rotating iron core in the high-speed rotary brake to control the imbalance within the G2.5 level to reduce vibration and noise during high-speed operation.
② Impact-resistant and fatigue-resistant design
The stress set on the core is stronger in the middle (such as the edge of the hole and the step). Precise rounding ( Λ′𝖱≥0.3𝗆𝗆 ), and can use shot peening process to improve fatigue strength ≥30% , to meet the high frequency ( 100 10,000 times) action requirements.
③ Weight reduction and heat dissipation optimization on non-working surfaces
Under the premise of meeting the magnetic circuit area and structural strength, the weight reduction groove or heat dissipation hole is precisely processed in the non-critical area of the armature to optimize its power-to-weight ratio and facilitate the dissipation of braking heat.
4. Whole process magnetic-mechanical performance detection and traceability
① Magnetic performance sampling detection
Equipped with a magnetic property tester, DC magnetic properties (B-H curve) sampling can be performed on each batch of materials or finished products to ensure that the magnetic conductivity meets design expectations.
② 100% full inspection of dimension and shape tolerance
Use high-precision imagers, micrometers and profilers to detect 100% of the critical thickness, flatness, parallelism and aperture of each core, and automatically record and generate reports.
③ Functional trial assembly and test cooperation
Functional trial installation can be carried out according to the magnetic yoke and spring components provided by the customer, and their suction/release stroke, force, and matching data can be provided.
Technical Parameter
| Armature Type | Working Principle & Structural Features | Typical Materials | Core Manufacturing Challenges |
| Disc-type Electromagnetic Brake Rotor Core | Axial movement, planar contact. Requires extremely high flatness and parallelism for friction contact via brake shoes. | Commercial Pure Iron (DT4), Low Carbon Steel (10#), Powder Metallic Soft Magnetic Materials | Dimensional control of large-diameter thin discs, dual-plane high-precision machining, balance between wear resistance and durability. |
| Rotary-type Electromagnetic Clutch Rotor Core | Synchronously rotates with the rotor, performs radial or end-face contact, and requires high-speed dynamic balance. | Low Carbon Steel, Silicon Steel Sheet Lamination Components | High balance requirements of the rotating body, precise gap control for coil windings. |
| Micro Brake/Clutch Fixed Rotor Core | Small size, high operating frequency, suitable for precision braking or pneumatic actuation. | Commercial Pure Iron, Amorphous Alloy (1J50), Iron-Based Amorphous Alloy | Miniaturized precision machining, brittleness control of high-grade magnetic materials, ultra-long service life. |
| Integrated Friction Lining Fixed Rotor Core | Integrates the armature and friction lining via riveting or bonding, featuring a compact structure. | Soft Magnetic Substrate + Friction Material (Non-asbestos, Sintered Metal) | Reliable combination of dissimilar materials, flatness assurance of the integrated structure. |
| Redundant System Dual Fixed Rotor Core | Two independent rotor cores are installed coaxially to achieve mechanical redundancy, requiring extremely high synchronization and consistency. | Commercial Pure Iron, Low Carbon Steel | High consistency in size, weight, and magnetic properties of dual components; independent movement without interference. |
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