Frameless Torque Motor Comparison
Our standard frameless torque motors come with voltage ranges from 24-48V and diameters from the small 25mm to the large 115mm, covering widely the size range in the market. These motors are categorized into nine series, Select frameless motors tailored to your equipment.
They offer high precision, higher overload capacity, high torque, and lightweight, suitable for industries such as robotics including humanoid or bipedal robots, medical, and aerospace. These models have industry-leading performance and are cost-effective. Additionally, if the performance and cost are different, we offer customized solutions to better control your product costs.
The table below summarizes the main characteristics of each series of frameless motors. Click the "Model Number" button to check technical files including specs, datasheets, and CAD drawings for each of our frameless direct-drive torque motors.
| Model | OD(mm) | ID(mm) | Height(mm) | Rated Torque(Nm) | Rated Power(W) | Rated Speed(rpm) | Voltage(V) | Weight(kg) |
| U2510 U2515 U2523 |
25 | 11.6 | 10.8 15.2 23.4 |
0.025 0.05 0.075 |
10.48 20.96 31.44 |
4000 | 24 | 0.024 0.036 0.052 |
| U3815 U3822 U3834 |
38 | 18 | 15.3 22.3 34.3 |
0.1 0.2 0.35 |
31.4 62.9 110 |
3000 | 48 | 0.048 0.068 0.099 |
| U5019 U5024 U5037 |
50 | 28 | 19.8 24.3 37.9 |
0.27 0.42 0.7 |
84.89 132.05 220.08 |
3000 | 48 | 0.12 0.157 0.266 |
| U6017 U6022 U6035 |
60 | 33 | 17.7 22.2 35.8 |
0.45 0.6 0.96 |
141.48 188.64 301.82 |
3000 | 48 | 0.146 0.205 0.361 |
| U6818 U6822 U6836 |
68 | 37 | 18.3 22.8 36.4 |
0.63 0.86 1.54 |
198.07 270.38 484.18 |
3000 | 48 | 0.197 0.266 0.474 |
| U7618 U7623 U7636 |
76 | 42 | 18.6 23.1 36.7 |
0.89 1.23 2.06 |
279.82 386.71 647.66 |
3000 | 48 | 0.245 0.333 0.606 |
| U8519 U8523 U8537 |
85 | 47 | 19.3 23.8 37.4 |
1.21 1.65 2.69 |
380.42 518.76 845.74 |
3000 | 48 | 0.306 0.414 0.736 |
| U9419 U9424 U9437 |
94 | 42 | 19.7 24.2 37.8 |
1.58 2.05 3.67 |
496.75 644.52 576.92 |
3000 | 48 | 0.382 0.522 0.93 |
| U11526 U11530 U11544 |
115 | 65 | 26.3 30.8 44.4 |
3 3.9 6.1 |
943.2 1021.8 958.92 |
3000 2500 1500 |
48 | 0.655 0.85 1.45 |
| U13025 U13035 U13060 |
130 | 84 | 25.9 35.9 60.9 |
5 9 18 |
419.2 471.6 754.56 |
800 500 400 |
48 | 0.9 1.3 2.7 |
| U16025 U16035 U16060 |
160 | 106 | 25.9 35.9 60.9 |
9 15 32 |
471.6 471.6 670.72 |
500 300 200 |
48 | 1.1 1.6 3.3 |
| U20025 U20035 U20060 |
200 | 140 | 25.9 35.9 60.9 |
13 24 50 |
408.72 503.04 524 |
300 200 100 |
48 | 1.7 2.9 5.5 |
Available Frameless Torque Motor Solutions
Mosrac designs and manufactures direct-drive frameless brushless DC (BLDC) torque motors. This design allows the rotor and stator to be integrated directly into the application or assembly, offering maximum flexibility, being lightweight, and being a very compact size.
It is especially suitable for space-limited applications to meet special engineering projects, perfectly matching your facility spacing & industry needs. Simultaneously our frameless brushless direct-drive torque motors help you achieve your ideal torque, speed, size, and temperature for advanced robotics, medical devices, aerospace systems, and more.
Mosrac is also famous well known for its development of special and fully customized torque motors.
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U115 Series Frameless Direct Drive TorquView MoreYour Next Robotic Design Starts Here
The U-series frameless motors are the newest addition to Mosrac's complete line of robotic motors. They're typically used to drive the joints of collaborative robots (humanoid robots). They are also designed for a wide range of demanding applications in industries such as medical, aerospace, and defense. You will find these advanced motors suitable for meeting your unique requirements.
Request QuoteThe Frameless Torque Motor Advantage
High Torque DensityRare-earth magnets on the rotor ring produce a magnetic field twice as strong as ferrite magnets. Star winding ensures stable torque delivery even at slow rotation rates.Very Compact DesignU series direct-drive torque motors are very compact, hollow-shaft & brushless, easy to install in tight spaces, and do not require additional fittings or accessories to transmit force to driven machines.High EfficiencyWith additional moving parts and direct drive technology, these frameless motors minimize energy loss and increase overall system efficiency.Low MaintenanceFrameless brushless motors eliminate the necessity for mechanical transmissions such as gearboxes, belts, and speed reducers.Integrated thermal sensorFrameless brushless motors eliminate the necessity for mechanical transmissions such as gearboxes, belts, and speed reducers.Low CoggingFrameless direct drive torque motors are designed to minimize cogging torque, ensuring smooth and consistent motion.Part no. description
Torque Motor Series
U: Frameless torque motor
123456789Cable length
03:300mm
00: please consult for custom lengthStandard/Customized
None: Standard
C: CustomizedVoltage
48：DC48V
24：DC24V
(except u25 series, custom for other series)
12：DC12V
(Please consult for a custom voltage range)Environmental:
Default: -25℃~85℃
Please consult for a custom temperature rangeTemperature control
Nothing: w/o temperature control
T: w/ temperature controlEncoder type
H: Hall
E: Photoelectric incremental (analog)
E1: Photoelectric incremental type (digital)
E2: Photoelectric absolute type
S1: 17-bit magnetic encoder
S2: 24-bit magnetic encoder
T: 24-bit magnetic dual encoderRated torque
for example: 0.2Nm, 3Nm, 15Nm, or customSize:
for example:
Height: 10.8mm, 30.8mm, or custom
OD: 25mm,115mm, or customRotor type
I: inner rotor
E: outer rotor
eg：
UI：inner rotor frameless motor
UE：outer rotor frameless motorFor example
U3815: U series frameless torque motor, OD 38mm， height 15.3mm， rated torque 0.1Nm， inner rotor;
U11544: U series frameless torque motor， OD 115mm， height 44.4mm， rated torque 6.1Nm， inner rotor;
UE2506: U series frameless torque motor, OD 25.3mm， height 6.2mm， rated torque 0.04Nm， outer rotor;
Specification
Insulation level Grade F Insulation withstand voltage AC1500 V 60s Insulation resistance 10MΩ or more DC500V Excitation method three-phase permanent magnet motor Environmental Requirements Temperature -25℃~85℃ Humidity 20%~85%RH The atmospheric environment does not produce strong magnetism, no corrosion,no explosive gas, no oil mist, no dust; the altitude is below 1000 meters. Typical Applications
With its precise positioning, simplified design, and cost-effective, Frameless direct drive torque motors are used in a variety of high-performance applications, including:
