FAMILY 01 · SIBLING COMPONENT
Servo Motor Bobbins & Segmented Insulators
High-dielectric segmented and integral coil formers rated for CTI ≥ 600V and 200°C+ continuous operation in industrial servo motors.
Explore Servo Bobbins →Home › Products › 01 Bobbins & Insulators › Stepper Motor Bobbins
Custom & Standard Stepper Motor Bobbins (UL94 V-0 PPS / PA66)
Precision one-piece injection-molded stator bobbins engineered for hybrid, permanent magnet (PM), and linear stepper motors. Designed to guarantee neat magnet wire winding, high dielectric insulation, and smooth micro-stepping accuracy in smart home, security, office automation, and medical equipment.
✓ ±0.02mm Slot Tolerance
✓ UL94 V-0 & CTI ≥ 600V
✓ Standard Stock + Custom Tooling
PRECISION TOLERANCE
±0.02mm Tooling
CORE POLYMERS
PA66+GF, PPS, LCP, PA46
SAFETY & COMPLIANCE
UL94 V-0 · CTI ≥ 600V · RoHS/REACH
TOOLING & LEAD TIME
15–25 Days T1 · 7–10 Days Insert Swap
WHY ENGINEERS CHOOSE RUNHENG BOBBINS
Built to Eliminate Wire Jamming, Short Circuits & Thermal Warping
01. Zero Wire Jamming (±0.02mm)
Molded via Swiss Charmilles Slow-Speed Wire EDM and Sodick Mirror EDM. Ultra-tight dimensional tolerances and 100% burr-free slot edges prevent magnet wire snagging, displacement, or enamel scratches during high-speed automated winding.
02. 200°C+ Thermal Stability
Formulated with DuPont/BASF UL94 V-0 PPS and glass-fiber modified PA66 pellets. Resists softening, pin-hole deformation, and structural creep under continuous high-temperature motor operation.
03. Low Moisture Absorption
Pre-modified polymer formulations minimize water absorption—preventing post-molding shrinkage, dimensional drift, or dielectric cracking in humid or rapidly cycling thermal environments.
04. Stock + Insert Modification
Mainstream standard NEMA frame models are kept in regular stock for immediate sampling. For non-standard stack lengths or custom wire exit slots, we offer low-cost mold insert modifications.
TECHNICAL SPECIFICATIONS
Stepper Motor Bobbin Engineering Parameters
Available Base Resins
Modified PA66, PA66 + Glass Fiber (15%–35% GF), PPS, LCP, PA46 (DuPont / BASF Partners)
Flame Retardancy Grade
UL94 V-0 Certified (Raw material pre-modified & pelletized)
Electrical Insulation
CTI ≥ 600V; 100% Outgoing Sampling Dielectric Withstand Voltage Tested
Thermal Resistance
Continuous Operating Temperature: 150°C to 220°C+ (Material Dependent)
Dimensional Tolerance
±0.02mm (Controlled via mold temperature units & automated robotic extraction)
Mold Machining Standard
Swiss Charmilles Slow-Speed Wire EDM & Japanese Sodick Mirror EDM (Zero manual polishing)
Quality & Defect Control
≤ 50 PPM Defect Rate; ISO 9001:2015, ISO 14001:2015, UL Process Certified
Environmental Compliance
Full RoHS & REACH Certified
STANDARD & CUSTOM CONFIGURATIONS
Supported Stepper Bobbin Geometries
Standard NEMA Frame Bobbins (NEMA 8 / 11 / 14 / 17 / 23 / 34)
High dimensional consistency compatible with mainstream hybrid stepper motor laminations. Regular stock available for fast prototyping.
Inquire Standard Stock →
Multi-Slot Octagonal & Circular Stator Insulators
Integrated top/bottom stator end-caps with precision wire-routing hooks and snap-fit end cover locking slots.
Request Custom Quote →
Overmolded Stator & Pin-Integrated Bobbins
Direct insert overmolding onto silicon-steel stator cores or pre-embedded terminal pins to eliminate manual bobbin assembly.
Discuss Overmolding →HOW WE GUARANTEE CONSISTENCY
From Modified Pellets to 100% Inspected Bobbins
01. UL94 V-0 Raw Material Pre-Modification
Incoming PA66 and PPS resins are compounded for low water absorption, high flowability in thin walls, and UL94 V-0 flame retardancy prior to molding.
02. Charmilles Wire EDM Integrated Molding
Mold cores and ultra-thin slot inserts are cut via Swiss Charmilles Wire EDM, ensuring crisp corner radii and zero flash at parting lines.
03. Full Dimensional & Withstand Voltage QC
Every production batch undergoes optical CMM slot-width inspection, stator fit verification, and high-pot dielectric withstand voltage sampling.
01 / MOTOR BOBBINS & STATOR INSULATORS FAMILY
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Transformer & Inductor Coil Bobbins
0.35mm ultra-thin-wall LCP, PPS, and Phenolic bobbins with pre-embedded terminal pins and 260°C solder-heat resistance.
Explore Transformer Bobbins →DIRECT ENGINEERING SUPPORT
Need Standard Stepper Bobbin Samples or Custom Tooling?
Upload or email your 2D/3D stator drawing (STEP, IGES, DWG, PDF) or share your motor frame size. Free standard stock samples are available (freight collect), and custom DFM reviews are returned within 24 business hours.
✓ Free Standard Stock Samples (Freight Collect)
✓ 24-Hour Engineering DFM & Quote Response
✓ 100% NDA Confidentiality Protection
Send Your 2D/3D Drawing or Sample Request
Fill out the project specs below or attach your CAD files. Our engineering team responds within 24 business hours.
