cl series coreless dc motors
The Premotec Coreless DC motors have a maximized performance due to the use of precious metal commutation in combination with high performance magnets. As these motors are coreless there are no iron losses, no preferred rotor position and due to the use of many phases, the torque ripple is reduced to a minimum.
The CL series motor performance is summarized below.

Specifications Overview
| Frame Size (mm) | 29, 40, 66 |
| Bus Voltage (VDC) | 6 - 36 |
| Rated Speed (RPM) | 2,560 - 5,280 |
| Rated Power (W) | 3 - 25 |
Need Assistance? Call: 203-596-1258
documents & resources
CL 29 Series
| Part Numbers | Voltage | Direction | Speed | Watt |
|---|---|---|---|---|
| 9904 120 18601 | 6 | REV | 4010 | 3 |
| 9904 120 18602 | 7.2 | REV | 3850 | 3 |
| 9904 120 18603 | 9 | REV | 3990 | 3 |
| 9904 120 18105 | 12 | REV | 3840 | 3 |
| 9904 120 18605 | 15 | REV | 3750 | 3 |
| 9904 120 18606 | 18 | REV | 4010 | 3 |
| 9904 120 18215 | 24 | REV | 3840 | 3 |
CL 29 Series 3 W Coreless DC Motors
SPECIFICATIONS
| Model | 9904 120 + | 18601 | 18602 | 18603 | 18105 | 18605 | 18606 | 18215 |
|---|---|---|---|---|---|---|---|---|
| Nominal Voltage | V | 6 | 7.2 | 9 | 12 | 15 | 18 | 24 |
| Nominal Torque | mNm (oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) | 10 (1.42 oz-in) |
| Nominal Speed | RPM | 2680 | 2550 | 2680 | 2440 | 2380 | 2680 | 2470 |
| Nominal Current | mA | 775 | 620 | 515 | 370 | 290 | 260 | 185 |
| No-Load Speed | RPM | 4010 | 3850 | 3990 | 3840 | 3750 | 4010 | 3840 |
| No-Load Current | mA | 67 | 52 | 45 | 31 | 24 | 22 | 16 |
| BEMF at 3000 RPM | V | 4.35 | 5.44 | 6.53 | 9.07 | 11.6 | 13.1 | 18.1 |
| Torque Constant | mNm/A (oz-in/A) | 13.9 (1.97) | 17.3 (2.45) | 20.8 (2.95) | 28.9 (4.09) | 37 (5.24) | 41.6 (5.89) | 57.7 (8.17) |
| Terminal Resistance | Ohm | 2.7 | 4.2 | 6.1 | 12.5 | 20.1 | 24.5 | 49 |
| Starting Torque at Nom. Voltage | mNm (oz-in) | 30 (4.25) | 30 (4.25) | 30 (4.25) | 27 (3.82) | 27 (3.82) | 30 (4.25) | 28 (3.97) |
| Starting Current at Nom. Voltage | A | 2.21 | 1.73 | 1.47 | 0.96 | 0.5 | 0.73 | 0.49 |
| Rotor Inductance | mH | 0.2 | 0.32 | 0.46 | 0.89 | 1.46 | 1.84 | 3.55 |
| Rotor Inertia | kgm2 (oz-in-s2) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) | 0.9E-6 (1.27E-4) |
| Mech. Time Constant | ms | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Thermal Resistance Winding-Housing | °C/W | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 |
| Thermal Resistance Housing-Ambient | °C/W | 16.3 | 16.3 | 16.3 | 16.3 | 16.3 | 16.3 | 16.3 |
CL 40 Series
| Part Numbers | Voltage | Direction | Speed | Watt |
|---|---|---|---|---|
| 9904 120 16701 | 6 | REV | 3780 | 7 |
| 9904 120 16702 | 9 | REV | 4050 | 7 |
| 9904 120 16703 | 12 | REV | 3780 | 7 |
| 9904 120 16704 | 15 | REV | 3940 | 7 |
| 9904 120 16705 | 18 | REV | 4050 | 7 |
| 9904 120 16706 | 24 | REV | 3980 | 7 |
| 9904 120 16707 | 30 | REV | 3940 | 7 |
CL40 Series 7 W Coreless DC Motors
SPECIFICATIONS
| Model | 9904 120 + | 16701 | 16702 | 16703 | 16704 | 16705 | 16706 | 16707 |
|---|---|---|---|---|---|---|---|---|
| Nominal Voltage | V | 6 | 9 | 12 | 15 | 18 | 24 | 30 |
| Nominal Torque | mNm (oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) | 22 (3.12 oz-in) |
| Nominal Speed | RPM | 2650 | 3010 | 2700 | 2920 | 3050 | 2980 | 2930 |
| Nominal Current | mA | 1520 | 1090 | 760 | 635 | 540 | 400 | 320 |
| No-Load Speed | RPM | 3780 | 4050 | 3780 | 3940 | 4050 | 3980 | 3940 |
| No-Load Current | mA | 60 | 44 | 30 | 25 | 22 | 16 | 13 |
| BEMF at 3000 RPM | V | 4.71 | 6.59 | 9.42 | 11.3 | 13.2 | 17.9 | 22.6 |
| Torque Constant | mNm/A (oz-in/A) | 15 (2.12) | 21 (2.97) | 30 (4.25) | 36 (5.1) | 42 (5.95) | 57 (8.07) | 72 (10.2) |
| Terminal Resistance | Ohm | 1.2 | 2.2 | 4.6 | 6.3 | 8.4 | 15.6 | 25.1 |
| Starting Torque at Nom. Voltage | mNm (oz-in) | 74 (10.5) | 86 (12.2) | 77(10.9) | 85 (12) | 89 (12.6) | 87 (12.3) | 28 (3.97) |
| Starting Current at Nom. Voltage | A | 5 | 4.1 | 2.6 | 2.4 | 2.1 | 1.5 | 1.2 |
| Rotor Inductance | mH | 0.15 | 0.29 | 0.59 | 0.85 | 1.16 | 2.14 | 3.41 |
| Rotor Inertia | kgm2 (oz-in-s2) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) |
| Mech. Time Constant | ms | 20 | 20 | 20 | 19 | 19 | 19 | 19 |
| Thermal Resistance Winding-Housing | °C/W | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| Thermal Resistance Housing-Ambient | °C/W | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
CL 40 Series
| Part Numbers | Voltage | Direction | Speed | Watt |
|---|---|---|---|---|
| 9904 120 15601 | 12 | REV | 5280 | 12 |
| 9904 120 15602 | 15 | REV | 5180 | 12 |
| 9904 120 15603 | 18 | REV | 5220 | 12 |
| 9904 120 15604 | 24 | REV | 5280 | 12 |
| 9904 120 15605 | 30 | REV | 3750 | 12 |
CL40 Series 12 W Coreless DC Motors
SPECIFICATIONS
| Model | 9904 120 + | 15601 | 15602 | 15603 | 15604 | 15605 |
|---|---|---|---|---|---|---|
| Nominal Voltage | V | 12 | 15 | 18 | 24 | 30 |
| Nominal Torque | mNm (oz-in) | 26 (3.68 oz-in) | 26 (3.68 oz-in) | 26 (3.68 oz-in) | 26 (3.68 oz-in) | 26 (3.68 oz-in) |
| Nominal Speed | RPM | 4140 | 4090 | 4150 | 4170 | 4100 |
| Nominal Current | mA | 1250 | 980 | 830 | 630 | 490 |
| No-Load Speed | RPM | 5280 | 5180 | 5220 | 5280 | 5180 |
| No-Load Current | mA | 49 | 38 | 32 | 25 | 19 |
| BEMF at 3000 RPM | V | 6.76 | 8.62 | 10.3 | 13.5 | 17.2 |
| Torque Constant | mNm/A (oz-in/A) | 21.5 (3.05) | 27.4 (3.88) | 32.6 (4.62) | 43 (6.09) | 54.9 (7.78) |
| Terminal Resistance | Ohm | 2.1 | 3.3 | 4.6 | 8.3 | 13.1 |
| Starting Torque at Nom. Voltage | mNm (oz-in) | 121 (17.1) | 123 (17.4) | 126 (17.8) | 123 (17.4) | 125 (17.7) |
| Starting Current at Nom. Voltage | A | 5.6 | 4.5 | 3.9 | 2.9 | 2.3 |
| Rotor Inductance | mH | 0.31 | 0.5 | 0.71 | 1.23 | 2.01 |
| Rotor Inertia | kgm2 (oz-in-s2) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) | 4E-6 (5.67E-4) |
| Mech. Time Constant | ms | 18 | 18 | 18 | 18 | 18 |
| Thermal Resistance Winding-Housing | °C/W | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| Thermal Resistance Housing-Ambient | °C/W | 10.5 | 10.5 | 10.5 | 10.5 | 10.5 |
CL 66 Series
| Part Numbers | Voltage | Direction | Speed | Watt |
|---|---|---|---|---|
| 9904 120 13601 | 12 | REV | 2560 | 25 |
| 9904 120 13602 | 15 | REV | 2830 | 25 |
| 9904 120 13603 | 18 | REV | 2890 | 25 |
| 9904 120 13604 | 24 | REV | 2580 | 25 |
| 9904 120 13605 | 30 | REV | 2960 | 25 |
| 9904 120 13606 | 36 | REV | 3210 | 25 |
CL66 Series 25 W Coreless DC Motors
SPECIFICATIONS
| Model | 9904 120 + | 13601 | 13602 | 13603 | 13604 | 13605 | 13606 |
|---|---|---|---|---|---|---|---|
| Nominal Voltage | V | 12 | 15 | 18 | 24 | 30 | 36 |
| Nominal Torque | mNm (oz-in) | 100 (14.2 oz-in) | 100 (14.2 oz-in) | 100 (14.2 oz-in) | 100 (14.2 oz-in) | 100 (14.2 oz-in) | 100 (14.2 oz-in) |
| Nominal Speed | RPM | 1800 | 2090 | 2200 | 2170 | 2280 | 2540 |
| Nominal Current | mA | 2330 | 2060 | 1750 | 1300 | 1080 | 980 |
| No-Load Speed | RPM | 2560 | 2830 | 2890 | 2850 | 2960 | 3210 |
| No-Load Current | mA | 81 | 77 | 66 | 49 | 41 | 40 |
| BEMF at 3000 RPM | V | 13.9 | 15.7 | 18.5 | 25 | 30.1 | 33.3 |
| Torque Constant | mNm/A (oz-in/A) | 44.2 (6.26) | 50.1 (7.1) | 59 (8.36) | 79.6 (11.3) | 95.8 (13.6) | 106 (15) |
| Terminal Resistance | Ohm | 1.6 | 2 | 2.5 | 4.6 | 6.6 | 8 |
| Starting Torque at Nom. Voltage | mNm (oz-in) | 335 (47.5) | 384 (54.4) | 418 (59.2) | 418 (59.2) | 436 (61.8) | 477 (67.6) |
| Starting Current at Nom. Voltage | A | 7.6 | 7.7 | 7.1 | 5.3 | 4.6 | 4.5 |
| Rotor Inductance | mH | 0.59 | 0.75 | 1.04 | 1.9 | 2.75 | 3.37 |
| Rotor Inertia | kgm2 (oz-in-s2) | 21E-6 (2.97E-3) | 21E-6 (2.97E-3) | 21E-6 (2.97E-3) | 21E-6 (2.97E-3) | 21E-6 (2.97E-3) | 21E-6 (2.97E-3) |
| Mech. Time Constant | ms | 17 | 16 | 15 | 15 | 15 | 15 |
| Thermal Resistance Winding-Housing | °C/W | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 |
| Thermal Resistance Housing-Ambient | °C/W | 5 | 5 | 5 | 5 | 5 | 5 |
Discover Cutting-Edge Coreless DC Motors for Your Unique Applications
Delivering precision and performance, our commitment to providing top-notch coreless dc motors exemplifies our leadership in motion technology. We proudly serve the Illinois area, offering innovative solutions that cater to a wide range of industrial applications. Every motor we provide is crafted with attention to detail and efficiency, ensuring that your projects are powered with reliability. As experts in gear motors and motor control systems, we understand that each client has unique needs, which is why we focus on custom solutions. Partner with us today to experience the unparalleled quality and engineering excellence MJK Inc. offers.
Where Can I Find High-Quality Coreless DC Motors in Illinois?
Leading the charge in motion technology, we at MJK Inc. understand the significance of innovative solutions for various industries. Our expertise extends to high-performance coreless dc motors
, designed for precision and efficiency. Serving Illinois, we offer advanced motor control systems that can integrate seamlessly into your existing applications. Our commitment to excellence means that when you choose our coreless dc motors
, you are investing in reliability and superior performance for your projects. We also focus on customization, ensuring that each coreless dc motor
meets your specific requirements and specifications. With years of experience, we guarantee that our coreless dc motors
will help enhance productivity in your operations and allow you to harness the power of cutting-edge technology. Trust us to be your reliable partner in delivering exceptional motion solutions that drive success and innovation. Discover more about coreless dc motors
today.
contact the mjk inc. team today
Our strengths are exemplified through unparalleled quality, innovative design, and dedicated customer support. Contact our team today to learn more.
Contact Us
Frequently Asked Questions
If you don’t find what you’re looking for, feel free to reach out—we’re happy to assist!

