Specification
This frameless rotary motors, with a 68mm outer diameter and 37mm aperture, mounts on a 37mm shaft to directly drive robot joints. Available torques: 0.65Nm, 0.86Nm, 1.55Nm, and highly customizable options.
| Model | U6818 | U6822 | U6836 | |
| DC Voltage(VDC) | 48 | 48 | 48 | |
| Rated Output(W) | 204 | 270 | 487 | |
| Rated torque(N.m) | 0.65 | 0.86 | 1.55 | |
| Instant Max Torque(N.m) | 1.95 | 2.5 | 4.65 | |
| Rated Current(A) | 6.3 | 8 | 12 | |
| Instant Max Current(A) | 18.9 | 24 | 36 | |
| Rated Speed(rpm) | 3000 | 3000 | 3000 | |
| Maximum Speed(rpm) | 4500 | 4500 | 4500 | |
| Torque Parameter(Nm/A) | 0.103 | 0.1075 | 0.129 | |
| Rotor inertia(kg.m²) | 0.262 | 0.37 | 0.68 | |
| Back EMF coefficient(Vrims/KRPM) | 6.5 | 7 | 8 | |
| Coil resistance(ohms@20℃) | 0.55 | 0.35 | 0.18 | |
| Inductance(mH) | 0.4 | 0.3 | 0.2 | |
| Number of pole-pairs(2P) | 10 | 10 | 10 | |
| Weight(g) | 197 | 266 | 474 | |
| Cogging Torque (mN.m) | 20(REF.) | 26(REF.) | 48(REF.) | |
| Size(mm) | L1 (Stator stack height) | 10 | 14.5 | 27.5 |
| L2 (Rotor height) | 11 | 15.5 | 28.5 | |
| L3 (Overall height) | 18.6 | 22.9 | 36.6 | |
Drawing
Case studies (Customized frameless motors developed with our clients)
Additional Info
The U68-series frameless stator-rotor kits represent Mosrac's consistent evolution of the previous generation's frameless series. Delivering excellent overload capabilities, high torque density, and maximum precision, these kits are built to fit seamlessly into compact spaces. They are perfectly used widely for demanding applications such as medical technology, robotics, mechanical engineering, tools, and more.
Benefits:
▪︎ High torque torque-to-inertia ratio for quick responsiveness and precision control
▪︎ High torque density in a space-saving package
▪︎ Large rotor interior diameter for convenient cable routing
▪︎ Standard lead lengths
▪︎ Low cogging torque for a smooth, steady operation
▪︎ Constructed with corrosion-inhibitive materials
▪︎ Supported by rigorous testing for performance and reliability
▪︎ Manufactured by the world's most comprehensive electric motor manufacturer
▪︎ On-hand Inventory availability and short lead times
▪︎ Class F insulation
▪︎ CE, RoHS, REACH Compliant
▪︎ Custom Designs Available
Applications:
▪︎ Machine tool
▪︎ Packaging
▪︎ Robotics
▪︎ Semiconductor
▪︎ Automotive
When to Use:
▪︎ Substantial cost savings
▪︎ Decreased mechanical complexity
▪︎ Enhanced flexibility in design
▪︎ Exceptional performance in a compact space
▪︎ Improved dynamic response
▪︎ Minimum motor size in each application
▪︎ Low cogging for smooth operation
▪︎ Low inertia allows for quicker acceleration
Download
U6818 Torque Motor Catalog.pdf
OD: 68mm|Height: 18.3mm
U6822 Torque Motor Catalog.pdf
OD: 68mm|Height: 22.8mm
U6836 Torque Motor Catalog.pdf
OD: 68mm|Height: 36.4mm
U68 68MM Series Frameless Rotary Motors Catalog.pdf
OD: 68mm|Height: 18.3~22.8~36.4mm optional
OD: 68mm|Height: 18.3mm
OD: 68mm|Height: 22.8mm
OD: 68mm|Height: 36.4mm
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Frequently bought together - Magnetic encoders
Direct drives need high-quality position signals to ensure optimal performance. Perfect measuring signals can enhance the surface quality of machined workpieces, reduce the machine frame's vibrations, minimize velocity-dependent motor noise, and prevent excessive heat generation in the motor.
Mosrac recommends using a magnetic encoder to enhance the accuracy, speed stability, and thermal behavior of direct drive axes. Because there is no mechanical transmission between the encoder and the feed unit, the position signals are not susceptible to inaccuracies or delays.
Custom combinations are available on request and contact us.
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