BLDC motor 85ZWC series

48 Vframeless

Product overview
The modular stator and rotor design of the 85 mm frameless BLDC motor, together with optimized slot ratios, increases torque density. The rotor provides a large inner bore and the stator is intended for customer-embedded installation, simplifying integration of custom mounting structures and cooling systems. The optimized slot-pole combination reduces cogging torque for smooth operation. The overall structure is compact and highly integrated.

Motor Characteristics (table)
Parameter | Unit | 85ZWC25X-1 | 85ZWC35X-1
Motor part number | - | 85ZWC25X-1 | 85ZWC35X-1
Stator outer diameter | mm | 85±0.043 | 85±0.043
Rotor inner diameter | mm | 52+0.046 | 52+0.046
Overall length (L) | mm | 20.3 | 30.1
Stack length (L1) | mm | 13.8 | 23.6
Rotor length (L2) | mm | 25±0.2 | 35±0.2
Number of slots | - | 18 | 18
Pole pairs | - | 10 | 10
Phase-to-phase resistance | Ω | 0.14 | 0.06
Phase-to-phase inductance | mH | 0.34 | 0.12
Winding connection method | - | Star connection | Star connection
Insulation class | - | F | F
Duty type | - | S2 | S2
Feedback method | - | Hall sensor | Hall sensor
Commutation angle | - | 120° | 120°
Insulation strength (Withstand voltage) | - | 500VAC/1mA/1s | 500VAC/1mA/1s
Insulation resistance | - | 100MΩ/500VDC | 100MΩ/500VDC
Stator weight | g | 315 | 460
Rotor weight | g | 135 | 189
No-load speed | RPM | 3650 | 4700
No-load current | A | 0.6 (REF) | 2.4 (REF)
Rated voltage | VDC | 48 | 48
Rated power | W | 422 | 827
Rated torque | N·m | 1.3 | 2
Rated speed | RPM | 3100 | 3950
Rated current | A | 10.3 | 20.6
Torque constant | Nm/A | 0.16 | 0.117
Back-EMF constant (effective value) | Vrms/Krpm | 9.7 | 8.66
Peak torque | N·m | 3.9 | 6
Peak current | A | 27 | 62
Rotor inertia | g·cm² | 1086 | 1520

Dimensional / Lead-out
Lead-out type: UL1332 AWG16
Lead-out color and function: Yellow - U phase; Red - V phase; Black - W phase
Dimensional drawings and dimensional images available for both 85ZWC25X-1 and 85ZWC35X-1 (illustrations show external dimensions and mounting details).

Torque Performance
Torque performance curves are provided for both 85ZWC25X-1 and 85ZWC35X-1 showing speed vs torque characteristics and speed/thrust curves.

Technical specifications

• Stator outer diameter: 85±0.043 mm
• Rotor inner diameter: 52+0.046 mm
• Overall length (L): 20.3 mm (85ZWC25X-1) / 30.1 mm (85ZWC35X-1)
• Stack length (L1): 13.8 mm / 23.6 mm
• Rotor length (L2): 25±0.2 mm / 35±0.2 mm
• Number of slots: 18
• Pole pairs: 10
• Phase-to-phase resistance: 0.14 Ω / 0.06 Ω
• Phase-to-phase inductance: 0.34 mH / 0.12 mH
• Winding connection: Star connection
• Insulation class: F
• Duty type: S2
• Feedback: Hall sensor
• Commutation angle: 120°
• Insulation withstand voltage: 500VAC/1mA/1s
• Insulation resistance: 100MΩ/500VDC
• Stator weight: 315 g / 460 g
• Rotor weight: 135 g / 189 g
• No-load speed: 3650 RPM / 4700 RPM
• No-load current: 0.6 A (REF) / 2.4 A (REF)
• Rated voltage: 48 VDC
• Rated power: 422 W / 827 W
• Rated torque: 1.3 N·m / 2 N·m
• Rated speed: 3100 RPM / 3950 RPM
• Rated current: 10.3 A / 20.6 A
• Torque constant: 0.16 Nm/A / 0.117 Nm/A
• Back-EMF constant (effective): 9.7 Vrms/Krpm / 8.66 Vrms/Krpm
• Peak torque: 3.9 N·m / 6 N·m
• Peak current: 27 A / 62 A
• Rotor inertia: 1086 g·cm² / 1520 g·cm²
• Lead-out type: UL1332 AWG16; colors: Yellow (U), Red (V), Black (W)