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 |
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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 |
Experience Precision with Our Coreless DC Motors Today
Our commitment to motion technology sets us apart in the field of coreless dc motors. We understand that diverse applications demand high-performance solutions and strive to deliver custom motor solutions that align with your specific needs. As leading gear motor manufacturers, we focus on creating robust, efficient components that enhance productivity across various industries. At MJK Inc., we empower businesses to achieve their operational goals with innovative motor control systems and precision-engineered gear motors. Discover how our expertise can elevate your projects and drive your success in the realm of motion technology. Contact us today to learn more.
Where Can I Find Coreless DC Motors in California?
In our pursuit of excellence in motion technology, we proudly offer top-of-the-line coreless dc motors
to industries across California. Our mission revolves around delivering cutting-edge motor solutions, and coreless dc motors
are among the standout products we provide. These motors are specifically engineered for high efficiency, making them an optimal choice for a wide range of applications, from robotics to medical devices. At our company, we understand how crucial it is to have reliable components; thus, we focus on creating tailor-made coreless dc motors
that meet your unique specifications. Trust us to supply the quality and performance you need, as our coreless dc motors
are designed to enhance productivity and drive innovation forward. Whether you require a precision-engineered solution or a complete motor control system, we have the expertise and dedication to support your vision. For more information and options, explore coreless dc motors
available in California.
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.
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