The frameless motor core is a compact design, often used in applications with strict space requirements. It eliminates the traditional motor housing, integrating the stator and rotor directly to reduce motor size and weight. The design focuses on high power density and dynamic performance, meeting the needs for rapid movement and precise control.

Yuma Precision Micro Frameless Motor Cores: Powering Miniaturization and High-Dynamic Precision Motion

Yuma Precision pushes frameless motor technology to the extreme of miniaturization, delivering core power solutions for cutting-edge applications where space and weight are critically constrained. Our micro frameless motor cores (typically with outer diameters below 127 mm, down to as small as 10 mm) combine innovative electromagnetic design, premium materials, and micro-precision manufacturing processes to unleash high torque and high accuracy within cubic-centimeter-scale volumes. They are an ideal choice for advanced equipment such as micro-robots and precision medical devices.

Core Features and Technological Breakthroughs

1. Extreme Space Utilization and Lightweight Design

• Ultra-compact structure: By completely eliminating traditional housings and end caps and retaining only the electromagnetic functional core (stator and rotor laminations with windings), the volume is reduced by more than 60% compared with conventional framed motors of the same power, while weight is reduced by over 70%.

• System-level integration: Designed as a “plug-and-integrate” power module, it can be seamlessly embedded into the customer’s mechanical structure (such as robot joint arms or surgical instrument handles), maximizing internal space utilization.

2. Exceptional Dynamic Response and Control Accuracy

• Ultra-low rotational inertia: The micro rotor adopts lightweight alloys or even composite materials, resulting in extremely low inertia. This enables millisecond-level acceleration and deceleration response, with bandwidth far exceeding that of conventional micro motors.

• Zero transmission, high rigidity: Supports rigid direct coupling between the rotor and the load shaft, completely eliminating backlash, friction, and elastic deformation associated with micro gearboxes or worm drives. This achieves sub-arcminute positioning accuracy and extremely high torque stiffness.

3. High Thermal Efficiency and Reliability

• Direct heat dissipation path: The stator core and windings are directly bonded to the customer’s primary heat dissipation structure, resulting in minimal thermal resistance and highly efficient heat transfer. This allows for higher continuous current and greater power density.

• High-strength structural design: Despite the miniature size, the iron core and mounting interfaces undergo precise mechanical simulation and optimization to ensure structural integrity under high-speed rotation and load shocks.

Typical Application Scenarios

1. Embodied Intelligence and Micro Robotics

• Application scenarios: Finger joints of biomimetic dexterous hands, hip/knee joints of micro quadruped robots, eye-tracking and steering mechanisms.

• Challenges: Drive units must be integrated into fingertips or joints while simultaneously achieving high torque, fast response, and extremely low weight.

• Yuma solution: Provides micro frameless torque motor kits ranging from Φ12 mm to Φ115 mm. For example, a Φ15 mm stator–rotor assembly with a 12 mm stack length can deliver over 0.3 Nm of continuous torque and instantaneous peak torque exceeding 1.0 Nm, directly driving finger joints to precisely replicate gripping force and speed.

2. High-End Medical and Surgical Robotics

• Application scenarios: Surgical robot wrist instruments, catheter robot drive units, high-precision micro-injection pumps.

• Challenges: Adequate torque must be delivered within extremely confined medical device housings, while meeting stringent requirements for sterility, biocompatibility, and long-term reliability.

3. Precision Optics and Optoelectronic Equipment

• Application scenarios: LiDAR scanning galvanometers, spatial light modulators, precision optical shutters, optoelectronic tracking platforms.

• Challenges: Require extremely high angular acceleration, ultra-low angular jitter, and thermal stability during long-term operation.

Comprehensive Deep Customization Options

Yuma Precision offers end-to-end deep customization for micro frameless motors, from concept design to mass production.

1. Dimensional Parameters and Process Customization

• Dimensional range:

• Standard customizable outer diameter: Φ12 mm – Φ127 mm

• Axial stack length: 0.35 mm – 100 mm

• Hollow bore: Through-hole designs supported, with inner diameters up to 70% of the outer diameter, facilitating cable routing, optical paths, or the integration of other components.

• Performance customization: Precise electromagnetic design based on required core parameters such as torque constant (Kt), back-EMF constant (Ke), and resistance (R), optimizing the torque–speed curve for the target application.

2. Material and Process Customization

• Key process options:

• Winding processes: precision flyer winding, needle winding, or the use of Litz wire to reduce high-frequency eddy current losses.

• Fixation and encapsulation: laser micro-welding or encapsulation with medical- or aerospace-grade potting compounds.

Conclusion

Yuma Precision micro frameless motor cores are the core engines driving equipment toward being smaller, lighter, smarter, and more precise. With micron-level manufacturing accuracy and deeply customized engineering capabilities, we compress powerful motion performance into unprecedentedly small scales. Whether enabling human-like dexterity in robots, driving precise medical interventions, or controlling light beams with nanometer-level accuracy, Yuma Precision is your trusted partner in exploring the limitless possibilities of the micro-motion world.