Frameless rotor/stator unit 50ZWC series

for frameless modulebrushless motor48 V

Overview
The 50mm frameless brushless (BLDC) motor features a modular stator-and-rotor design and optimized slot-to-pole ratios to increase torque density. The rotor provides a large inner bore while the stator is intended for embedded installation by the customer, enabling custom mounting structures and integrated cooling solutions for flexible system design. The optimized slot-pole combination reduces cogging torque for smooth, stable operation. The assembly is compact and highly integrated.

Motor characteristics

• Models: 50ZWC15X-1; 50ZWC25X-1
• Stator outer diameter: 50±0.031 mm
• Rotor inner diameter: 30+0.033 mm
• Overall length (L): 13.2 mm / 19.5 mm
• Rated power: 168 W / 219 W
• Rated torque: 0.3 N·m / 0.51 N·m
• Rated speed: 5350 RPM / 4100 RPM
• Peak torque: 0.96 N·m / 1.5 N·m

Dimensional drawings & Performance
Dimensional drawings and torque performance curves for the listed models are available on the product page. Connection type: UL1332 AWG20. Wire colours: Yellow = Phase U, Red = Phase V, Black = Phase W.

Technical specifications

• Model: 50ZWC15X-1; 50ZWC25X-1
• Stator outer diameter: 50±0.031 mm
• Rotor inner diameter: 30+0.033 mm
• Overall length (L): 13.2 mm (50ZWC15X-1); 19.5 mm (50ZWC25X-1)
• Stack length (L1): 8.9 mm (50ZWC15X-1); 15.2 mm (50ZWC25X-1)
• Rotor length (L2): 17.7±0.2 mm (50ZWC15X-1); 24±0.2 mm (50ZWC25X-1)
• Number of slots: 18
• Pole pairs: 10
• Phase-to-phase resistance: 0.62 Ω (50ZWC15X-1); 0.6 Ω (50ZWC25X-1)
• Phase-to-phase inductance: 0.44 mH (50ZWC15X-1); 0.45 mH (50ZWC25X-1)
• Winding connection: Star connection
• Insulation class: F
• Duty type: S2
• Feedback: Hall sensor
• Commutation angle: 120°
• Insulation strength: 500VAC/1mA/1s
• Insulation resistance: 100 MΩ/500VDC
• Stator weight: 77.5 g (50ZWC15X-1); 124 g (50ZWC25X-1)
• Rotor weight: 38 g (50ZWC15X-1); 50 g (50ZWC25X-1)
• No-load speed: 6400 RPM (50ZWC15X-1); 5000 RPM (50ZWC25X-1)
• No-load current: 0.4 A (REF) (50ZWC15X-1); 1.1 A (REF) (50ZWC25X-1)
• Rated voltage: 48 VDC
• Rated power: 168 W (50ZWC15X-1); 219 W (50ZWC25X-1)
• Rated torque: 0.3 N·m (50ZWC15X-1); 0.51 N·m (50ZWC25X-1)
• Rated speed: 5350 RPM (50ZWC15X-1); 4100 RPM (50ZWC25X-1)
• Rated current: 4.4 A (50ZWC15X-1); 5.65 A (50ZWC25X-1)
• Torque constant: 0.074 Nm/A (50ZWC15X-1); 0.092 Nm/A (50ZWC25X-1)
• Back-EMF constant (effective): 5.5 Vrms/Krpm (50ZWC15X-1); 6.8 Vrms/Krpm (50ZWC25X-1)
• Peak torque: 0.96 N·m (50ZWC15X-1); 1.5 N·m (50ZWC25X-1)
• Peak current: 10.7 A (50ZWC15X-1); 16.1 A (50ZWC25X-1)
• Rotor inertia: 100 g·cm² (50ZWC15X-1); 135 g·cm² (50ZWC25X-1)