This article highlights seven leading global robot joint actuator providers, including Harmonic Drive Systems, Kollmorgen, Maxon, Midea Industrial Technology (Welling), HONPINE, Laifual Drive, and CubeMars.

This article highlights the Top 7 Global Frameless Torque Motor Manufacturers, including Kollmorgen, Aerotech, Maxon, Allied Motion, TQ-RoboDrive, Tecnotion, and HONPINE. It provides an overview of each company's history, technical strengths, and key application areas. The article also introduces HONPINE's FMC and fourth-generation FMK frameless torque motor series, which are specifically designed for humanoid robots, collaborative robots, and advanced automation systems. With advantages such as high power density, lightweight design, low cogging torque, fast dynamic response, and customization capabilities, HONPINE continues to optimize its frameless motor technology to support next-generation robotic joint and mechatronic module applications.

This article begins with the principle of cogging torque in frameless motors, explains how slotless core technology eliminates torque ripple and vibration, and highlights the three major breakthroughs achieved by frameless torque motors in 2025: increasing low-speed torque through high pole-pair designs exceeding 32 pole pairs, adopting hollow frameless structures for compact and lightweight designs, and utilizing high-grade NdFeB permanent magnets to enhance torque density.

Torque motors can be divided into frameless torque motors and framed torque motors (DD motors). This article will explain the fundamental differences between frameless and framed torque motors, and how to select the right motor for your specific application.