OverviewThe 38 mm frameless BLDC motor features a modular stator and rotor design with optimized slot ratios to increase torque density. The rotor provides a large inner bore and the stator is designed for customer-embedded installation, enabling tailored integration of mounting structures and cooling solutions. The optimized slot–pole combination reduces cogging torque for smooth operation. The overall structure is compact and highly integrated.
Key motor specificationsMotor part numbers: 38ZWC15X-1 / 38ZWC22X-7
Stator outer diameter: 38 mm (±0.019)
Rotor inner diameter (bore): 18 mm (+0.018)
Overall length (L): 11.3 mm / 18.3 mm
Stack length (L1): 0.55 mm / 1.05 mm
Rotor length (L2): 8.1 mm / 16.1 mm
Slots / Pole pairs: 12 / 7
Phase-to-phase resistance: 0.8 Ω / 0.14 Ω
Phase-to-phase inductance: 0.9 mH / 0.185 mH
No-load speed: 13000 RPM
No-load current: 0.6 A (REF)
Rated voltage: 48 VDC
Rated power: 110 W / 245 W
Rated torque: 0.1 N·m / 0.23 N·m
Rated speed: 10470 RPM / 10190 RPM
Rated current: 2.75 A / 6.10 A
Torque constant: 0.035 Nm/A / 0.039 Nm/A
Back-EMF constant (Vrms/Krpm): 2.6 / 2.88
Peak torque: 0.32 N·m / 0.76 N·m
Peak current: 11 A / 24.2 A
Rotor inertia: 10 g·cm² / 20 g·cm²
Stator weight / Rotor weight: 50 g / 10 g (38ZWC15X-1) ; 87 g / 20 g (38ZWC22X-7)
Dimensional and wiring detailsLead-out type: UL1332 AWG20
Lead-out color coding: Yellow = U phase; Red = V phase; Black = W phase
Dimensional drawings and mounting drawings available for both variants.
Technical features- Product family: 38ZWC series (38ZWC15X-1 short / 38ZWC22X-7 long)
- Frameless design for embedded installation
- Stator outer diameter: 38 mm (±0.019); rotor bore: 18 mm (+0.018)
- Slots / pole pairs: 12 / 7; commutation angle: 120°
- Winding: Star connection; insulation class: F
- Electrical ratings: 48 VDC; rated power 110 W / 245 W; rated current 2.75 A / 6.10 A
- Performance: low cogging torque, high torque density, no-load 13000 RPM
- Insulation withstand: 1200 VAC / 1s / 3 mA; insulation resistance: 50 MΩ / 500 VDC
- Lead-out: UL1332 AWG20 with phase color coding