Custom Hollow Shaft Frameless Torque Motor Supplier & OEM Manufacturer
Maintex produces hollow shaft frameless torque motor kits with dual segmented & solid stator production lines. We tailor custom torque and speed parameters for collaborative robot joint drive, wearable exoskeleton actuator and semiconductor precision gear equipment. Deliver 2D/3D CAD files within 72 hours and provide full certification to simplify your overseas OEM equipment registration.
Frameless Torque Motor Series – Segmented & Solid Stator Types
Maintex has two types of brushless permanent magnet frameless torque motors: segmented stator and solid stator. Outer diameter ranges from 38mm to 172mm, with fixed voltage, torque and speed options for robot, medical and automation machines.
Split-core frameless motor: easy side assembly, low heat for robot joints & exoskeletons.
- Outer Diameter: 50 / 69 / 85 mm
- Rated Voltage : 48V DC
- Rated Torque: 0.5 – 2.3 N·m
- Peak Torque: 1.5 – 7 N·m
- Rated Speed: 900 – 3500 rpm
- Weight: 150 – 500 g
Standard reliable series for medical, semiconductor and general automation.
- Outer Diameter: 38 – 172 mm
- Rated Voltage: 12V / 24V / 28V / 48V DC
- Rated Torque: 0.1 – 6.5 N·m
- Peak Torque: 0.32 – 11.6 N·m
- Rated Speed: 30 – 10300 rpm
- Insulation Class: Class F
Why Choose Our Frameless Torque Motors
Our segmented & solid stator torque motors cover OD38–172mm, full voltage & speed specs. Complete electrical parameters provided for precise OEM design, with strict production tolerance control to avoid vibration and rubbing.
12/24/48V DC fits portable & industrial automation drives
From low-speed rotary racks to tiny high-speed inspection gears
High pole pairs cut cogging torque, segmented models lighter in weight
EMF, resistance & inductance fully listed for drive debugging
Segmented stator winding error controlled within 2% to cut vibration
38–172mm outer diameter, customizable core stack thickness
Standard -20~+40℃, customizable -40~+85℃ aerospace grade
Heat resistance up to 155℃ for reliable full-load operation
Solid Stator Integral Frameless Torque Motors
We make this frameless torque motor with one-piece laminated silicon steel and full-ring winding. Mass production is well-developed to keep unit cost low and bulk orders delivered steadily. The integral ring balances three-phase electromagnetism naturally, so cogging torque is easy to tune, and the winding stands vibration and dampness well. The downside is installation only from shaft ends, no cooling gaps, which brings higher temperature rise under continuous full load. Small size tweaks need brand-new full molds, pushing up prototype cost and lead time.
Segmented Modular Frameless Torque Motors
This segmented modular frameless torque motor uses separate fan-shaped iron cores. Each core gets wound alone before assembly, with gaps left between segments for heat dissipation. You can fit this motor sideways into tight spaces, saving over 30% assembly time for cobot and exoskeleton housings. Those gaps cut running temperature by 10–15℃ under full continuous load, and split cores lighten the motor by 8%–12%. It runs more smoothly at low speed with weaker cogging torque. We only remake single core molds for minor spec changes, which halves your prototype cost.
Resource
Download full specs, dimensions and performance data of hollow frameless torque motor kits
Watch production and quality inspection processes of segmented & solid stator frameless torque motors
Download verified CE, RoHS, REACH certificates of frameless direct drive torque motors for project review
20-Year In-House R&D For Frameless Direct Drive Motors
Maintex runs a 45,000㎡ plant with 1,200 staff and 225 patents covering hollow & frameless torque motor technology. Imported Zeiss inspection tools guarantee tight tolerances; our 70 R&D & 80 QA teams offer traceable test sheets, 1-year global warranty and rapid 8D analysis for orders shipped to over 100 countries.
Wide Applications of Frameless Torque Motors
Our segmented modular frameless torque motors perfectly solve core pain points of cobot joint assembly and operation. The unique side assembly and hollow shaft design adapts to narrow joint cavities and simplifies internal cable routing. Built-in direct drive zero-backlash structure delivers fast response, while low cogging torque ensures ultra-smooth movement, greatly boosting human-machine collaboration safety and accuracy.
As core power components for humanoid robot limbs and fingers, our segmented modular frameless torque motors adopt compact lightweight design. It fits extremely narrow joint cavities via side assembly and hollow wiring. Low inertia and low cogging torque output eliminate rigid movement, while zero-backlash direct drive enables flexible, natural and highly dynamic robot actions.
Maintex segmented modular frameless torque motors perfectly match the dynamic operation needs of quadruped robot leg joints. The segmented structure cuts overall weight and simplifies compact module assembly. Optimized heat dissipation avoids torque attenuation from frequent starts and stops. High torque density and fast response support stable walking, running and complex terrain adaptation.
Our lightweight segmented frameless torque motors are tailor-made for wearable rehabilitation exoskeletons. It features excellent torque-to-weight ratio to reduce human body load and improve wearing comfort. Smooth direct drive and precise torque control deliver gentle, jitter-free movement, with stable performance supporting long-term safe medical application.
Our solid stator frameless torque motors are ideal for high-precision industrial equipment like rotary tables and semiconductor sorting machines. The integral lamination process ensures superior three-phase balance and high rigidity. Direct drive eliminates mechanical backlash and vibration, delivering sustained stable operation and ultra-high positioning accuracy for precision production.
Frameless torque motors are the optimal power solution for optical gimbal and monitoring equipment. Ultra-low cogging torque completely solves image jitter and blurring during low-speed tracking. Compact hollow structure saves internal installation space, while high torque density and wide speed range balance precise positioning and fast response for stable clear imaging.
Our solid stator frameless torque motors are widely used in industrial automation and AGV systems. With mature mass production technology, it delivers stable load resistance and outstanding cost performance. The direct drive structure reduces mechanical loss and maintenance costs, and standard voltage models are fully compatible with mainstream industrial drives.
More About Our Frameless Torque Motor
- Frameless Torque Motor Specification Table
- Gallery
| Model | Rated Voltage (V) | Rated speed (rpm) | Rated Torque (N ·m) | Rated Power (W) | Rated Current (A) | Peak Current (A) | Peak Torque (N ·m) | EMF constant (Vrms/krpm) | wire resistance (Ω) | Wire Inductance (mH) | Pole Pairs (p) | Operating Temperature Range | Storage Temperature | Insulation Class | phase | Induction method | weight（g) | OD （mm） | height （mm) |
| 38LW03 | 48 | 10300 | 0.102 | 110 | 2.8 | 8.8 | 0.32 | 2.3 | 1.2 | 0.48 | 7 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 75 | 38 | 14.5 |
| 60LW01 | 48 | 4000 | 0.27 | 114 | 2.7 | 13 | 1.37 | 7.2 | 0.75 | 0.39 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 212 | 60 | 22.6 |
| 76LW02 | 48 | 3900 | 0.63 | 258 | 5.6 | 36 | 2.86 | 7.56 | 0.28 | 0.25 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 400 | 76 | 28.8 |
| 85LW02 | 48 | 1500 | 1.7 | 267 | 11 | 42 | 5.1 | 11.2 | 0.28 | 0.27 | 14 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 505 | 85 | 30 |
| 104LW02 | 28 | 300 | 2.5 | 79 | 7 | 14 | 5 | 22.9 | 0.67 | 0.96 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 800 | 104 | 27 |
| 127LW01 | 48 | 2400 | 3.2 | 800 | 19.5 | 39 | 6.4 | 12.4 | 0.09 | 0.18 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 1164 | 127 | 36 |
| 172LW03 | 12 | 30 | 6.5 | 20.5 | 7 | 13.8 | 11.6 | 62 | 0.41 | 1.01 | 13 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 2750 | 172 | 82 |
| 172LW04 | 12 | 30 | 4.5 | 14 | 8.2 | 11 | 6 | 34.2 | 0.41 | 0.83 | 13 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 1500 | 172 | 64 |
| 60ZWS02 | 24 | 1760 | 0.53 | 98 | 5.6 | 19 | 1.8 | 6.41 | 0.54 | 0.34 | 7 | -20～+40℃ | -10～+35℃ | F | 3 | PM | – | 60 | 22.7 |
| 68LW01 | 48 | 4000 | 0.55 | 231 | 5.6 | 19 | 1.65 | 6.4 | 0.44 | 0.35 | 7 | -20～+40℃ | -10～+35℃ | F | 3 | PM | – | 68 | 21.7 |
| 50LW09H | 48 | 3500 | 0.5 | 183 | 4.8 | 15.5 | 1.5 | 7 | 0.64 | 0.23 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 150 | 50 | 21.6 |
| 69LW01H | 48 | 3500 | 1.5 | 550 | 13 | 43.7 | 4.5 | 7 | 0.16 | 0.2 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 310 | 69 | 27.5 |
| 85LW05H | 48 | 900 | 2.3 | 216 | 6.1 | 23 | 7 | 24.4 | 0.64 | 1.43 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 500 | 85 | 27.4 |
| 104LW01 | 48 | 3000 | 1.8 | 566 | 13 | 40 | 5.4 | 9.55 | 0.13 | 0.17 | 10 | -20～+40℃ | -10～+35℃ | F | 3 | PM | 725 | 104 | 27 |
Their frameless torque motor paired really well with our Beckhoff and Kollmorgen drives. All common protocols like EtherCAT, CANopen, PROFINET work right out of the box. They provided full motor parameters so we didn’t have to spend 1–2 weeks tuning. The 5kHz bandwidth is perfect for our robot’s force control. Super professional experience.
Luca FerrariItalyWe were worried about high mold costs and slow production for small batches. But they didn’t make new molds, just adjusted winding and stack thickness, which saved us a lot. They also have a dedicated production line and guarantee on delivery. No more delays, no huge upfront costs. Great for our R&D projects.
Sophie WeberGermanyWe used Kollmorgen and TQ motors before, but they’re too expensive and have long lead times. This drop-in replacement cut our BOM cost by 50%–60% with no loss in precision. Better for small joints, low MOQ, fast samples. Total game-changer for our robot business.
Ethan KimSouth Korea
Frameless torque motors are direct-drive, zero-backlash, hollow shaft, and integrate directly into the joint. Servo motors need reducers and have larger size. Our frameless models have higher torque density, smoother low-speed operation, and are more suitable for robot joints, gimbals and precision rotary equipment.
Cogging torque is the magnetic resistance when the motor runs without power. Lower cogging means smoother movement, less jitter, and higher positioning accuracy. Our frameless torque motors use optimized magnetic design to minimize cogging, making them ideal for gimbals, medical devices and precision force control robots.
The hollow shaft allows cables, sensors and pipes to pass through the center, simplifying wiring and saving space. It makes the structure more compact and beautiful, especially for humanoid robots, cobots and exoskeletons. Our frameless motors support customizable inner diameter to match your structure.
Torque motors provide high continuous torque at low speed without reducer. Ordinary BLDC needs high speed and reduction gear. Our frameless torque motors feature high torque density, low noise, and stable output, widely used in precision control fields like robotics, semiconductors and gimbals.
Yes, we fully support customization for frameless torque motors. We can adjust winding parameters, stack length, voltage, rated speed and continuous torque. For segmented motors, we can modify single module without full mold change, shortening development cycle and lowering prototype cost.
Continuous torque is stable long-term output without overheating. Peak torque is short-time maximum for acceleration and impact. Our motors have high peak/rated ratio, ideal for dynamic robot joint movements.
Yes. Direct-drive frameless torque motors achieve zero backlash and high precision at low speed, replacing traditional servo with reducer. It simplifies structure, improves accuracy and reduces maintenance.
Pick segmented stator for narrow robot joints, side assembly and better heat dissipation. Choose solid stator for low-cost mass production, semiconductor rotary tables and high electromagnetic balance demand.
Our frameless kits fully support EtherCAT, CANopen, PROFINET, matching Beckhoff, Kollmorgen, Inovance, Panasonic and Kinco servo drives. Complete drive matching parameters are provided free of charge.
