42 mm Slotless Brushless DC Motor
Compact 42 mm slotless (ironless-winding) brushless DC motor designed for high-torque-density rotary motion applications requiring Hall sensor feedback, low cogging, and smooth, low-noise output in robotics, laboratory automation, medical devices, AGV/AMR systems, and industrial automation.
Available in five voltage and duty-cycle configurations, the 42ZWWC80 slotless BLDC motor delivers 66–160 W rated power, 90–180 mN·m rated torque, and no-load speeds up to 13,800 RPM, with optional precision planetary gearbox configurations available for precision motion applications.
Motor Characteristics
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| Specification | Unit | 42ZWWC80 | ||||
|---|---|---|---|---|---|---|
| 18V | 24V (S2) | 36V | 48V | 24V (S1, 2-Pole) | ||
| Pole Pairs | - | 1 | 2 | |||
| Terminal Resistance, Phase-Phase | Ω | 0.4 | 0.45 | 0.6 | 0.95 | 0.22 |
| Terminal Inductance, Phase-Phase | mH | 0.085 | 0.14 | 0.23 | 0.035 | |
| Winding Connection Method | - | Star Connection | ||||
| Insulation Class | - | B | ||||
| Duty Type | - | S2 | S1 | |||
| Feedback Method | - | Hall Sensor | ||||
| Commutation Angle | - | 120° | ||||
| Insulation Strength (Withstand Voltage) | - | 500VAC/1KHz/1mA/1s | ||||
| Insulation Resistance | - | 100MΩ/500VDC | ||||
| Weight | g | 500 | ||||
| Rated Voltage | V | 18 | 24 | 36 | 48 | 24 |
| Rated Power | W | 66 | 80 | 100 | 160 | 102 |
| Rated Torque | mN·m | 90 | 120 | 180 | ||
| Rated Speed | RPM | 6678 | 8346 | 11619 | 12200 | 5400 |
| Rated Current | A | 4.89 | 4.17 | 3.47 | 4.17 | 5.7 |
| No Load Speed | RPM | 9000 | 11000 | 13000 | 13800 | 6800 |
| No Load Current | A | 0.6 | 0.69 | 0.6 | 0.58 | 0.42 |
| Motor Efficiency | % | 75 | 80 | 87.9 | ||
| Noise (Ambient 20dB, Test Distance 1m) | dB | <50 | ||||
| Thermal Resistance | K/W | 4.11 | 4.79 | 5.44 | 5.32 | 4.7 |
| Thermal Time Constant | S | 1240 | 1620 | 2040 | 1340 | |
| Ambient Temperature | ℃ | 23.1 | 23.5 | 23 | 22.6 | |
| Max Winding Temperature | ℃ | 51.5 | 63.7 | 80 | 72.1 | |
| Torque Constant | mN·m/A | 18.41 | 21.6 | 25.92 | 28.8 | 31.58 |
| Back-EMF Constant, Peak Value | V/Krpm | 2.73 | 3.20 | 3.84 | 4.26 | 4.68 |
| Back-EMF Constant, Effective Value | V/Krpm | 1.93 | 2.26 | 2.71 | 3.02 | 3.31 |
| Peak Torque | mN·m | 828.41 | 1152 | 1555.2 | 1455.16 | 3444.98 |
| Peak Current | A | 45 | 53 | 60 | 51 | 109 |
| Rotor Inertia | g·cm² | 96.3 | ||||
| Mechanical Time Constant | ms | 11.37 | 9.29 | 8.60 | 11.03 | 2.12 |
| End Bell | - | Stainless Steel | ||||
| Bearing | - | Deep Groove Ball Bearing | ||||
| Magnet | - | Sinter NdFeB | ||||
| Rotation Shaft | - | Carbon Steel | ||||
Dimensional Drawing
Outline and dimensions shown below apply to the 42ZWWC80 motor at a constant 42 mm diameter.
Torque Performance Curves
Customization Options
The 42 mm Slotless Brushless DC Motor can be paired with a precision planetary gearbox to increase output torque and reduce output speed. Contact our engineering team for shaft, cable, and connector customization requests for this series.
Precision Planetary Gearbox
The 42 mm Slotless BLDC motor ships standard with the 42 mm gearbox below. DINGS' offers 10 precision planetary gearbox sizes from 6 mm to 42 mm — browse any size for reference.
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9 | 15 | 57 |
| Max. backlash | ° | 1.8 | 2.0 | 2.2 |
| Max. continuous output power | W | 0.65 | 0.4 | 0.2 |
| Max. peak output power | W | 0.8 | 0.5 | 0.25 |
| Max. continuous input speed | rpm | 20000 | ||
| Max. peak input speed | rpm | 25000 | ||
| Max. continuous torque | N·m | 0.002 | 0.005 | 0.01 |
| Max. peak torque | N·m | 0.005 | 0.01 | 0.02 |
| Max. efficiency | % | 88 | 77 | 68 |
| Weight | g | 1.6 | 2 | 2.4 |
| Gearbox length L | mm | 4.7 | 7.2 | 9.7 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|---|
| Gear Ratio | X : 1 | 4 | 16 | 64 |
| Max. backlash | ° | 1.8 | 2.0 | 2.2 |
| Max. continuous output power | W | 0.84 | 0.52 | 0.4 |
| Max. peak output power | W | 1.05 | 0.65 | 0.5 |
| Max. continuous input speed | rpm | 14000 | ||
| Max. peak input speed | rpm | 20000 | ||
| Max. continuous torque | N·m | 0.01 | 0.02 | 0.06 |
| Max. peak torque | N·m | 0.015 | 0.03 | 0.09 |
| Max. efficiency | % | 90 | 81 | 72 |
| Weight | g | 2.6 | 3.2 | 3.8 |
| Gearbox length L | mm | 5.5 | 8.1 | 10.7 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 4.25 | 18 | 77 | 326 |
| Max. backlash | ° | 1.5 | 1.8 | 2.0 | 2.2 |
| Max. continuous output power | W | 1.6 | 1.2 | 1.0 | 0.4 |
| Max. peak output power | W | 2 | 1.5 | 1.3 | 0.5 |
| Max. continuous input speed | rpm | 14000 | |||
| Max. peak input speed | rpm | 18000 | |||
| Max. continuous torque | N·m | 0.01 | 0.03 | 0.10 | 0.15 |
| Max. peak torque | N·m | 0.02 | 0.05 | 0.15 | 0.2 |
| Max. efficiency | % | 90 | 81 | 73 | 65 |
| Weight | g | 6.8 | 7.3 | 7.8 | 8.3 |
| Gearbox length L | mm | 10.1 | 13.6 | 17.1 | 20.6 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 4.3 | 18.4 | 79 | 337 |
| Max. backlash | ° | 1.2 | 1.5 | 1.8 | 2.1 |
| Max. continuous output power | W | 2.0 | 1 | 0.5 | 0.25 |
| Max. peak output power | W | 2.5 | 1.25 | 0.65 | 0.3 |
| Max. continuous input speed | rpm | 16000 | |||
| Max. peak input speed | rpm | 20000 | |||
| Max. continuous torque | N·m | 0.08 | 0.11 | 0.14 | 0.17 |
| Max. peak torque | N·m | 0.1 | 0.14 | 0.18 | 0.21 |
| Max. efficiency | % | 90 | 80 | 75 | 65 |
| Weight | g | 9 | 12 | 15 | 18 |
| Gearbox length L | mm | 11.3 | 15.1 | 18.9 | 22.7 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 4.3 | 18.4 | 79 | 337 |
| Max. backlash | ° | 1.1 | 1.3 | 1.45 | 1.7 |
| Max. continuous output power | W | 4.0 | 2.0 | 1.0 | 0.4 |
| Max. peak output power | W | 5.0 | 2.5 | 1.25 | 0.5 |
| Max. continuous input speed | rpm | 14000 | 16000 | ||
| Max. peak input speed | rpm | 18000 | 20000 | ||
| Max. continuous torque | N·m | 0.16 | 0.2 | 0.25 | 0.3 |
| Max. peak torque | N·m | 0.2 | 0.25 | 0.31 | 0.38 |
| Max. efficiency | % | 90 | 80 | 75 | 65 |
| Weight | g | 11 | 15 | 19 | 23 |
| Gearbox length L | mm | 11.8 | 16.1 | 20.4 | 24.7 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9, 5.3 | 16, 21, 28 | 62, 83, 111, 150 | 243, 326, 439, 590, 794 |
| Max. backlash | ° | 1.0 | 1.2 | 1.3 | 1.4 |
| Max. continuous output power | W | 6.5 | 3.2 | 1.6 | 0.6 |
| Max. peak output power | W | 8.0 | 4.0 | 2.0 | 0.75 |
| Max. continuous input speed | rpm | 12000 | 14000 | ||
| Max. peak input speed | rpm | 15000 | 18000 | ||
| Max. continuous torque | N·m | 0.2 | 0.25 | 0.35 | 0.45 |
| Max. peak torque | N·m | 0.25 | 0.35 | 0.45 | 0.55 |
| Max. efficiency | % | 90 | 80 | 75 | 65 |
| Weight | g | 25 | 31 | 37 | 42 |
| Gearbox length L | mm | 18.7 | 25.5 | 30.2 | 35 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9, 5.3 | 16, 21, 28 | 62, 83, 111, 150 | 243, 326, 439, 590, 794 |
| Max. backlash | ° | 0.85 | 1.05 | 1.2 | 1.35 |
| Max. continuous output power | W | 24 | 12 | 6.0 | 1.6 |
| Max. peak output power | W | 30 | 15 | 7.5 | 2.0 |
| Max. continuous input speed | rpm | 8000 | 10000 | ||
| Max. peak input speed | rpm | 10000 | 12500 | ||
| Max. continuous torque | N·m | 0.5 | 0.7 | 1.2 | 1.5 |
| Max. peak torque | N·m | 0.6 | 0.9 | 1.5 | 1.9 |
| Max. efficiency | % | 90 | 81 | 74 | 66 |
| Weight | g | 59 | 83 | 97 | 112 |
| Gearbox length L | mm | 22.3 | 33 | 39.6 | 46.3 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9, 5.3 | 16, 21, 28 | 62, 83, 111, 150 | 243, 326, 439, 590, 794 |
| Max. backlash | ° | 0.5 | 0.6 | 0.7 | 0.75 |
| Max. continuous output power | W | 100 | 50 | 25 | 8.0 |
| Max. peak output power | W | 125 | 62 | 31 | 10 |
| Max. continuous input speed | rpm | 6000 | 7000 | ||
| Max. peak input speed | rpm | 7500 | 8750 | ||
| Max. continuous torque | N·m | 1.25 | 2.90 | 5.0 | |
| Max. peak torque | N·m | 1.6 | 3.6 | 6.3 | |
| Max. efficiency | % | 90 | 81 | 72 | 65 |
| Weight | g | 103 | 150 | 174 | 198 |
| Gearbox length L | mm | 24.2 | 36.9 | 43.5 | 50.2 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9, 5.3 | 16, 21, 28 | 62, 83, 111, 150 | 243, 326, 439, 590, 794 |
| Max. backlash | ° | 0.5 | 0.6 | 0.7 | 0.8 |
| Max. continuous output power | W | 185 | 90 | 45 | 15 |
| Max. peak output power | W | 230 | 115 | 60 | 19 |
| Max. continuous input speed | rpm | 6000 | |||
| Max. peak input speed | rpm | 7500 | |||
| Max. continuous torque | N·m | 2.3 | 5.4 | 9.3 | |
| Max. peak torque | N·m | 2.9 | 6.8 | 11.6 | |
| Max. efficiency | % | 90 | 80 | 72 | 65 |
| Weight | g | 156 | 238 | 277 | 315 |
| Gearbox length L | mm | 30 | 44.7 | 51.3 | 58 |
| Specification | Unit | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|
| Gear Ratio | X : 1 | 3.9, 5.3 | 16, 21, 28 | 62, 83, 111, 150 | 243, 326, 439, 590, 794 |
| Max. backlash | ° | 0.3 | 0.4 | 0.5 | 0.6 |
| Max. continuous output power | W | 480 | 200 | 85 | 20 |
| Max. peak output power | W | 600 | 250 | 106 | 25 |
| Max. continuous input speed | rpm | 6000 | |||
| Max. peak input speed | rpm | 7500 | |||
| Max. continuous torque | N·m | 3.0 | 7.5 | 15 | |
| Max. peak torque | N·m | 4.5 | 11.3 | 22.5 | |
| Max. efficiency | % | 90 | 81 | 72 | 64 |
| Weight | g | 252 | 405 | 476 | 544 |
| Gearbox length L | mm | 36.1 | 54.9 | 63.6 | 72.4 |
Gear ratios shown above reflect standard stock configurations for each size. Additional gear ratios and stage combinations are available upon request — contact our engineering team to configure a custom reduction for your application.
Request Precision Planetary Gearbox Quote →Downloads
Part Number Builder
42 mm motor diameter
Slotless (ironless-winding) brushless DC motor series
Body length designation, mm
Hall sensor feedback is standard
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| Part Number | Rated Voltage | Duty Type | Rated Power | Rated Torque | Rated Speed |
|---|---|---|---|---|---|
| 42ZWWC80 | 18 V | S2 | 66 W | 90 mN·m | 6678 RPM |
| 42ZWWC80 | 24 V | S2 | 80 W | 90 mN·m | 8346 RPM |
| 42ZWWC80 | 36 V | S2 | 100 W | 90 mN·m | 11619 RPM |
| 42ZWWC80 | 48 V | S2 | 160 W | 120 mN·m | 12200 RPM |
| 42ZWWC80 | 24 V (2-Pole) | S1 | 102 W | 180 mN·m | 5400 RPM |
Need Help Selecting the Right 42 mm Slotless BLDC Motor?
Whether you need a standard motor, integrated gearbox, or a custom winding, our engineering team can help you select the right configuration for your application.