70 mm Frameless BLDC Motor
Compact frameless motor designed for embedded rotary motion systems requiring high torque density, smooth operation, and flexible mechanical integration.
Available in 70ZWC20X-1 and 70ZWC25X-1 configurations, with Hall sensor feedback, a large rotor inner bore, and an optimized slot-pole combination to reduce cogging torque.
Motor Characteristics
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| Specification | Unit | 70ZWC20X-1 | 70ZWC25X-1 |
|---|---|---|---|
| Stator Outer Diameter | mm | 69 ±0.037 | 69 ±0.037 |
| Rotor Inner Diameter | mm | 42 +0.039 | 42 +0.039 |
| Overall Length (L) | mm | 15.9 | 21.5 |
| Stack Length (L1) | mm | 10.3 | 15.9 |
| Rotor Length (L2) | mm | 20.5 ±0.2 | 26 ±0.2 |
| Number of Slots | - | 18 | 18 |
| Pole Pairs | - | 10 | 10 |
| Phase-to-Phase Resistance | Ω | 0.32 | 0.22 |
| Phase-to-Phase Inductance | mH | 0.52 | 0.35 |
| 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 | - | 500VAC / 1mA / 1s | 500VAC / 1mA / 1s |
| Insulation Resistance | - | 100MΩ / 500VDC | 100MΩ / 500VDC |
| Stator Weight | g | 167.5 | 224 |
| Rotor Weight | g | 72 | 90 |
| No-Load Speed | RPM | 4350 | 4400 |
| No-Load Current | A | 0.5 REF | 1.3 REF |
| Rated Voltage | VDC | 48 | 48 |
| Rated Power | W | 216 | 456 |
| Rated Torque | N·m | 0.55 | 1.3 |
| Rated Speed | RPM | 3750 | 3350 |
| Rated Current | A | 5.4 | 11.4 |
| Torque Constant | Nm/A | 0.109 | 0.13 |
| Back-EMF Constant, Effective Value | Vrms/Krpm | 8.1 | 9.6 |
| Peak Torque | N·m | 1.65 | 2.6 |
| Peak Current | A | 14.2 | 21 |
| Rotor Inertia | g·cm² | 358 | 455 |
Dimensional Drawing
Torque Performance Curves
Lead Wire Configuration
| Lead-Out Type | Lead-Out Color | Function |
|---|---|---|
| UL1332 AWG18 | Yellow | U Phase |
| UL1332 AWG18 | Red | V Phase |
| UL1332 AWG18 | Black | W Phase |
Customization Options
Embedded Installation
Designed for integration into customer housings, mounting structures, and compact mechanical assemblies.
Large Inner Bore
The rotor’s open bore supports flexible mechanical design and system-level integration.
Cooling System Integration
Stator installation can be reviewed around customer cooling requirements and packaging needs.
Performance Tuning
Motor windings, torque, speed, feedback, and application requirements can be reviewed for custom system needs.
Downloads
Part Number Builder
70 mm motor size
Slotted brushless DC motor
Circular frameless motor shape
Motor length designation
Coreless motor casing designation
Standard customer sequence number
Rated voltage
Mounting, cooling, winding, feedback, torque, speed, and integration options may be customized.