Frameless Motors with Encoders: Precision, Power, and Easy Fit

You want smooth motion. You want small size. You want big power. I get it.

I help you build fast, safe, smart machines. I make motion simple. I make motion right.

I am Jimi Technology Co., Ltd. I lead in linear actuators, TV lifts, and automation systems. My gear turns electric power into straight motion. You press a button. Things raise, lower, push, pull, or tilt. I am not just a seller. I am an expert. I am a solution provider. I am a trusted authority. You can count on me.

What is a frameless motor?

• It is two parts. A stator and a rotor.
• No case. No shaft. No bearings.
• You put it right in your machine.
• It is direct drive. It has zero backlash.
• It can be BLDC or PMSM.
• It can be slotless or distributed winding.
• It can have a hollow shaft. You can pass wires through.
• It can have high pole count for smooth feel.
• It brings high torque density in a compact motor design.
• It cuts weight and size. It saves space.

What is an encoder?

• It is a tiny eye. It tells position and speed.
• It can be absolute. You know spot right on power up.
• It can be incremental. You count steps.
• It can be optical, magnetic, or inductive.
• It can use Hall effect sensors.
• It can send digital or analog output.
• It can talk BiSS, SSI, Sin/Cos, or quadrature A/B/Z.
• It drives closed loop control with PID or FOC.

Why put them together?

• You get precision positioning and repeatability.
• You get high dynamic response with quick start and stop.
• You get low cogging torque. Motion feels silky.
• You cut mechanical complexity. No belts. No gear lash.
• You improve thermal management. Heat flows to your frame.
• You raise reliability and MTBF.
• You hit tight spaces with space-saving motor kits.

I build this into smart actuator components. I pair servo motor frameless kits with encoder feedback systems. I size them with performance curves, torque speed characteristics, continuous torque, peak torque, torque constant (Kt), back EMF constant, winding resistance, winding inductance, rotor inertia, thermal resistance, and operating temperature range. I design for EMI shielding, insulation class, environmental protection, and the right IP rating.

The promise to you

• I attract your eye. Small motor. Big push. Clean look.
• I point out the need. You want accuracy. You want safety. You want speed.
• I meet the need. I build to your spec. I test. I prove.
• I position my product as your fix. I make it fit. I make it work. I back it up.

Benefits at a glance

How the encoder helps

• Absolute encoder: safe start, no homing, fast boot.
• Incremental encoder: low cost, simple build.
• Watch key specs:
  • Resolution in bits or CPR
  • Accuracy and repeatability
  • Output interface and noise care

I match encoders from Renishaw, Heidenhain, Sick AG, Dynapar, Lika Electronic, Leine & Linde, Baumer, and BEI Sensors. I also support resolver feedback for heat and shock.

Where you can use it

• Robotics: collaborative robots, industrial robotic arms, end effectors, direct drive robotics, Harmonic Drive joints
• Mobile robots: AGV motor solutions and AMRs
• Medical: surgical robotics, tools, drills, prosthetics, exoskeletons, and diagnostic imaging like CT and MRI
• Aerospace & defense: gimbal systems, surveillance, aircraft control surfaces, guidance systems, UAVs, drone gimbal
• Industrial automation: semiconductor manufacturing, wafer handling, vision systems, pick and place systems, packaging machinery, ATE
• Other sites: cleanroom compatible motor, vacuum compatible motor, radiation tolerant motor, submersible motor, harsh environments

Pick the right kit: simple guide

I plan prototype motor development, small batch production, and volume production. I set connector options, cable lengths, and mounting options. I document technical specifications and application notes.

My ecosystem: I fit what you use

I support drives and lines from Kollmorgen, Maxon, Faulhaber, Portescap by Sensata Technologies, Tecnotion, Moog Inc., Parker Hannifin and Parker Electromechanical, Celera Motion (Novanta), and Allied Motion. I sync with Copley Controls and Elmo Motion Control. I interface to Yaskawa, Mitsubishi Electric, Siemens, Fanuc, KUKA, Universal Robots, and Stäubli systems. I follow NEMA and IEC rules. I meet EMI/EMC needs.

A quick look: performance chart

Torque Density   ██████████  10/10
Positional Hold  ██████████  10/10
Smooth Motion    █████████   9/10
Thermal Control  █████████   9/10
Footprint Size   ██████████  10/10  (smaller bar is better, lower is great)

Note: Your exact score can change by model and load and site.

Why Jimi for your build

• I bring experience in motion control systems for machine builders and OEM teams.
• I deliver design considerations that cut risk.
• I solve system integration challenges fast.
• I give full engineering support from idea to field.
• I help you win a competitive advantage with faster time to market.

Want a ready path for linear motion today? See my lines:

• Explore high-accuracy electric linear actuators with servo precision: Electric Linear Actuators
• Add smart feedback to your system with tight control: Actuators with Position Feedback
• Build compact power stages for OEM motion: Servo Motor Actuators
• Scale robust motion in plants and labs: Industrial Automation Actuators

A peek inside the tech

I can pair a brushless DC frameless motor or a permanent magnet synchronous motor frameless with your load. I tune PID controller gains and set field‑oriented control. I shape the inertia match. I map performance curves. I verify repeatability. I check noise reduction and vibration reduction. I plan thermal resistance paths. I guard with EMI shielding.

I test in cleanroom, vacuum, IP67, IP65, heat, and shock. I set operating temperature range. I note mean time between failures (MTBF). I align to motor insulation class.

I choose the right encoder resolution for your job. A robot joint needs high bits. A conveyor needs fewer counts. A gimbal motor needs Sin/Cos for smooth blend. A lab tool may need BiSS for noise immunity.

I match the stack to your controller on EtherCAT, CANopen, or PROFINET. I route cables through a hollow shaft. I mount to your frame with simple bolts. I set cable lengths and connector options that fit your panel.

Real world use cases

• A collaborative robot joint with a direct drive motor and absolute encoder. The arm starts safe with no home move and no pinch risk.
• A surgical robot hand tool with a slotless frameless motor. It runs smooth and quiet. It fits in a tight shell.
• An AGV hub with a servo motor frameless kit and magnetic encoder. It gives high dynamic response and holds torque on ramps.
• A semiconductor wafer stage with optical encoder integration and vacuum compatible motor. It hits precision positioning with high repeatability.
• A drone gimbal with low cogging torque motor and incremental encoder. It makes video steady.

My promise

You need speed. You need space. You need control. I deliver. I build custom frameless motor kits. I design for OEM motor integration. I bring design flexibility. I keep cost vs performance in line. I ship on time.

I can guide you with a motor sizing guide and motor selection criteria. I share application notes and technical specifications. I support prototype, small batch, and volume production.

When you want lift and tilt too, I bring full lines in lifting columns, TV lifts, and desk standing gear. I can tie a frameless motor with encoder to your actuator assemblies so your build stays clean and fast.

Summary

• Frameless plus encoder gives precision, power, and seamless integration.
• You get compact design, zero backlash, and high efficiency.
• You gain closed loop control and smarter motion.
• I help you pick and build. I stand by you.

References

• Kollmorgen. Direct Drive Frameless Motors Selection Guide.
• Renishaw. Encoder Fundamentals and Applications Notes.
• Heidenhain. Absolute vs Incremental Encoders Technical Overview.
• IEC 60034 Series. Rotating Electrical Machines Standards.
• NEMA MG 1. Motors and Generators Guidance.
• Celera Motion (Novanta). Inductive and Optical Encoder Technologies.
• Copley Controls. FOC and Servo Tuning Application Notes.
• Allied Motion. Frameless BLDC Motor Integration Guide.