FEIYIDA | Robot Joint Actuators &
Frameless Torque Motors

A robot joint actuator is a complete unit: motor, reducer, encoder and often the drive, delivered sealed and ready to bolt to a joint. A frameless torque motor is only the stator and rotor — no housing, no bearings, no output shaft — so you supply the bearing, the housing bore and the encoder yourself.

The joint actuator is faster to integrate. The frameless motor gives a lighter, stiffer joint when your structure can take the bearing load.

Start from the duty cycle, not the part. If the leg needs high peak torque for short impact windows and you want a sealed, replaceable module, specify a joint actuator. If the joint is mass-critical and the leg structure already carries the bearing load, specify a frameless torque motor and design the housing around it.

Both are sized by continuous and peak torque at the joint, never by motor frame size.

Our sealed servo actuator range starts at roughly 2 N·m and runs to about 39 N·m at the output — 20 to 400+ kg·cm in catalogue notation. Joint modules above that are quoted as a custom envelope, because above 40 N·m the limiting factor is usually the reducer and the sealing interface rather than the motor.

Both, but the custom path is our main business. We machine the housing, choose the screw or belt stage, integrate the motor and feedback, and test the finished unit on our own bench.

A custom linear actuator is defined by five inputs: thrust, stroke, speed, envelope and sealing class. If your requirement fits an existing platform we will say so rather than sell you a new design.

A prototype or engineering sample can be built as a single unit. MOQ applies to series production and depends on whether the design is a variant of an existing platform or a completely new envelope — a variant needs far less tooling.

We quote the series MOQ together with the prototype, so the number is known before you commit to the design.

Yes. A custom unit is normally built as a prototype first: machined housing, screw or belt stage selected, motor and feedback integrated, then run on our bench at your duty cycle. The report from that unit is what the series drawing is frozen against.

The prototype is also the cheapest point to change the design — a thermal margin that turns out too tight, or a seal that does not survive the mounting pattern, is a drawing edit at that stage; after tooling it becomes a re-design.

Feedback is absolute, using a magnetic encoder on the output or motor shaft, so position survives a power cycle without homing. Interfaces include PWM, SBUS, RS-485/Modbus and CAN.

We can also expose a bare FOC driver stage if your controller closes the loop itself. Protocol variants are a normal part of an OEM order, not a special project.

Yes. Datasheets, 2D drawings, STEP models, driver source and the IP67/IP68 test reports are published under Resources without a sales call. An engineer should be able to specify, mount and drive the hardware from the documents alone.

Complete sets. A propulsion set is quoted as brushless disc motor, ESC and propeller matched to one payload and flight-time target, because hover thrust, disc loading and the thermal limit at continuous climb are decided together rather than part by part.

Multirotor and fixed-wing VTOL airframes are both supported. The disc motors share the stator and rotor work of our frameless torque motors, and existing UAV part numbers and documentation stay unchanged.