Frameless torque motor
Lin Engineering PCT frameless BLDC motors
Frameless brushless motor kits in 50 to 115 mm frames for 48 V, with rated torque from 0.24 to 6.88 Nm (series maximum) and rated speeds up to 7,800 rpm.
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Key specifications
| Voltage (max) | 48 V |
|---|---|
| Rated torque | 0.24–6.88 Nm |
| Speed (max) | 7,800 rpm |
| Frame sizes | 50, 60, 68, 76, 85, 94, 115 |
| Supply | 48 V rated |
Summarised in our own words from Lin Engineering's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Rated torque converted from oz-in (34.41 to 974.29 oz-in). Peak torque not published on the overview.
Specify Motion is not affiliated with Lin Engineering. Lin Engineering and PCT frameless BLDC motors are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Lin Engineering PCT frameless BLDC motors replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Lin Engineering part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
In-runner frameless torque motors from 65 to 410 mm stator OD with 8-64 poles, low profile and large through-holes; windings tailored to target speed.
High-voltage (600 VDC) frameless torque motor kits from 110 to 360 mm with large through-bores and integrated Hall sensors; the high-torque end of the Akribis frameless range.
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Typical applications
What a frameless torque motor is
A frameless torque motor is a permanent-magnet brushless motor supplied as two parts, a rotor and a stator, with no housing, bearings or shaft. The machine builder mounts the rotor directly on the driven shaft and the stator in the machine structure, so the motor becomes part of the mechanism. Many have large through-holes and high pole counts, giving high torque at low speed with no gearbox. They need separate feedback, typically an encoder, and a servo drive.
When engineers choose a frameless torque motor
Choose a frameless motor when you want direct drive in a compact, integrated design, such as robot joints, gimbals, rotary tables and medical devices. Removing the gearbox eliminates backlash and improves stiffness and smoothness. The trade-offs are integration work and size: the builder supplies bearings, alignment, cooling and feedback, and torque per volume is lower than a geared solution. For off-the-shelf installation, a housed direct-drive motor may be simpler.
How to specify the Lin Engineering PCT frameless BLDC motors
Send these with your enquiry and an engineer can confirm the right PCT frameless BLDC motors variant or an equivalent:
- Continuous and peak torque (Nm)
- Speed (rpm)
- Outer diameter, bore and stack length (mm)
- Bus voltage and current (V, A)
- Thermal mounting and cooling
- Feedback type and resolution
- Air gap and concentricity tolerance (mm)
Common mistakes to avoid
- Leaving air gap and concentricity tolerances undefined
- Ignoring heat conduction from the stator into the housing
- Using an encoder with too low resolution for direct drive
- Forgetting rotor magnet attraction during assembly
Lin Engineering PCT frameless BLDC motors: frequently asked questions
Can you help replace Lin Engineering PCT frameless BLDC motors or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including Motion Control Products options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Lin Engineering PCT frameless BLDC motors?
Frameless brushless motor kits in 50 to 115 mm frames for 48 V, with rated torque from 0.24 to 6.88 Nm (series maximum) and rated speeds up to 7,800 rpm. Published series figures include voltage 48 V, rated torque 0.24 Nm, rated torque 6.88 Nm, speed 7,800 rpm. It is made by Lin Engineering; Specify Motion can help source it or propose an equivalent.
Who makes the Lin Engineering PCT frameless BLDC motors?
The Lin Engineering PCT frameless BLDC motors is made by Lin Engineering and is listed here for engineers comparing options. Specify Motion is not affiliated with Lin Engineering; brand names are used only to identify the product.
What is the voltage of the Lin Engineering PCT frameless BLDC motors?
The published series maximum voltage is 48 V. Individual models and sizes in the PCT frameless BLDC motors range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Lin Engineering PCT frameless BLDC motors?
We can assess suitable replacement options. On published figures, Motion Control Products TI Series In-Runner Frameless Direct Drive Torque Motors and Akribis Systems ADR-P are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the difference between a frameless and a housed torque motor?
A frameless motor is only a rotor and stator; the machine provides bearings, shaft, housing and feedback. A housed direct-drive motor adds bearings, housing and encoder in a ready-to-install unit. Frameless suits compact, integrated designs where the machine already has stiff bearings; housed suits faster installation and simpler alignment.
Why use a frameless motor instead of a gearbox?
Direct drive removes backlash, wear and compliance in the gear train, giving smoother motion and stiffer control. It also allows a large hollow shaft for cabling. The trade-off is that torque must come from the motor alone, so it is larger for a given torque.
Further reading: How to select a frameless torque motor · Frameless motor sizing robot joints · Frameless and torque motors
Other frameless torque motor series
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