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Product Overview

Frameless torque motors consist of separate stator and rotor components designed for direct integration into a machine's mechanical structure. In direct-drive applications, they eliminate the need for intermediary transmission components, depending on the system design. This configuration supports compact integration, high torque density, and precise rotary motion in applications where spatial constraints, torque output, and positioning accuracy are critical.

Engineered for OEM equipment manufacturers and motion control system integrators, frameless torque motors provide maximum flexibility for application-specific mechanical designs. The stator and rotor can be mounted directly into the customer housing and shaft assembly, allowing engineering teams to optimize the overall structure, installation envelope, and dynamic motion performance.

Key selection factors include motor dimensions, continuous and peak torque limits, operating velocity, winding configurations, thermal boundary conditions, and feedback system compatibility. The appropriate configuration must be determined according to the specific mechanical and electrical requirements of the application.

Rigid Frameless Torque Drive Motor
With 39 years of experience in motion control motor manufacturing, Hangzhou Zhongda independently develops and produces Rigid Frameless Torque Drive Motor solutions for high-load and high-precision
Miniature Frameless Rotary Motor
As a high-tech motor manufacturer specializing in precision motion control solutions, we have focused on the development and manufacturing of compact direct-drive motors since 1987. The Miniature
Frameless Direct Drive Motor
Established in 1987, we are a professional motion control motor manufacturer with a 16,000㎡ standardized production facility and 125 full-time technical and production employees. We independently
High-Rigidity Frameless Torque Motors
Our frameless torque motor has no housing or shaft. You can put it directly into your equipment. Hangzhou Zhongda Motor Co., Ltd. started in 1987. We have our own R&D department. Our High-Rigidity
Compact Frameless Torque Motors
Our Compact Frameless Torque Motors are small and light. They are easy to put into tight spaces. We are Hangzhou Zhongda Motor. We have been designing motors since 1987. We have our own R&D team.

Key Features & Benefits

High Torque Density: Delivers direct-drive torque within a compact radial and axial envelope, optimized for applications with limited installation space and demanding torque requirements.

Direct-Drive Integration: Eliminates gearboxes, belts, and couplings in suitable direct-drive architectures, reducing mechanical compliance and backlash. System performance relies on complete mechanical integration.

Flexible Mechanical Integration: Separate stator and rotor components allow engineers to design custom housings, shafts, and mounting interfaces around the motor, supporting application-specific machine layouts.

Thermal Management Versatility: Heat dissipation depends on the motor design, mounting structure, operating duty cycle, and cooling method. Proper thermal engineering supports required continuous torque output.

Precision Rotary Motion: Compatible with standard drives and high-resolution feedback systems to support accurate position control and smooth velocity profiles.

Manufacturing & Quality Assurance

Frameless torque motor manufacturing requires strict process control of component dimensions, winding uniformity, and rotor-stator alignment. Production and assembly methods are aligned with precise engineering specifications.
Routine quality verification protocols include:

Winding & Electrical Inspection

Verification of phase resistance, inductance, and electrical symmetry.

Dimensional Inspection

Checking critical mechanical interfaces and concentricity tolerances to support proper integration into customer assemblies.

Insulation Testing

Verification of dielectric performance according to applicable product specifications and voltage ratings.

Performance Verification

Evaluation of electromagnetic torque constants and operating characteristics corresponding to the specific motor model.

Applications

Frameless torque motors are engineered for integration into demanding rotary motion systems where space is constrained and precise control is required.

Typical application areas include:

Robotics: Integrated into joint modules and compact rotary actuator assemblies requiring direct-drive performance.

Precision Automation: Rotary positioning tables, indexing stages, and high-throughput automated motion platforms.

Optical Equipment: Precision tracking turrets and gimbals requiring smooth angular motion without mechanical resonance.

Semiconductor Equipment: Wafer handling and inspection assemblies subject to strict cleanliness and vacuum specifications.

Custom OEM Machinery: Specialized direct-drive mechanisms built around custom mechanical structures.

Specifications & Product Selection

Technical Specifications Matrix

Specification	Description
Motor Type	Frameless Torque Motor (Kit Motor)
Construction	Matched Stator and Rotor Components
Outer Diameter	Range: 30 mm to 300 mm (Model-Specific)
Axial Length	Model-Specific Stack Lengths
Continuous Torque	0.1 Nm to 150 Nm (Model-Specific)
Peak Torque	Model-Specific (Duty Cycle Dependent)
Maximum Speed	Dependent on Model and Bus Voltage
Insulation Class	Class H (180 deg C rating)
Cooling Method	Conduction, Liquid Cooled, or Natural Convection
Feedback Compatibility	Compatible with Optical, Magnetic, and Inductive Encoders

Selection Workflow for Engineers

Define the Load Profile: Calculate required continuous torque, peak torque, operating velocity, acceleration rates, and duty cycle.

Confirm Mechanical Dimensions: Establish allowable outer diameter, axial stack length, inner through-hole clearance, and mounting tolerances.

Evaluate Thermal Conditions: Assess ambient temperatures, housing material thermal conductivity, and cooling methods to maintain safe winding temperatures.

Match Electrical Parameters: Align bus voltage, winding resistance, torque constant, and drive amplifier current limits.

Submit Integration Details: Provide mechanical drawings, operating profiles, and environmental constraints for custom engineering evaluation and finite element analysis.

Frequently Asked Questions

Q: What should be considered when integrating a frameless torque motor?

A: Key considerations include rotor-stator concentricity, air-gap maintenance (typically 0.3 mm to 0.8 mm depending on size), mounting tolerances, shaft alignment, and thermal contact with the machine housing. Refer to technical drawings and assembly guidelines prior to installation.

Q: How should the operating temperature and cooling method be selected?

A: Operating limits depend on the winding insulation system (Class H standard), ambient conditions, and mounting structure. Continuous torque ratings assume proper thermal dissipation into an aluminum mounting chassis. Applications in enclosed or insulating structures require thermal derating.

Q: Can frameless torque motors be used in vacuum or cleanroom environments?

A: Yes. High-vacuum or cleanroom deployments require specialized materials, outgassing-tested adhesives, non-magnetic stainless steel sleeves, and hermetically encapsulated stators to meet specific pressure and cleanliness classifications.

Q: Which feedback devices are compatible with these kit motors?

A: Frameless motors operate independently of feedback but require an external high-resolution position sensor (such as optical, magnetic ring, or inductive absolute encoders) mounted directly on the axis for closed-loop commutation.

Q: What are the lead times for standard models versus custom configurations?

A: Standard catalog sample quantities typically ship within 2 to 3 weeks. Custom stack lengths, specialized winding configurations, or modified mechanical interfaces require 4 to 6 weeks for engineering review and prototype production.

Q: What technical documentation is provided with shipments?

A: Each order can include detailed product datasheets, dimensional drawings, electrical parameter sheets, and quality inspection reports containing individual phase resistance, Hi-Pot test confirmation, and dynamic balancing records upon request.

We're well-known as one of the most professional frameless torque motor manufacturers in China, also support customized service. Please feel free to buy bulk high quality frameless torque motor made in China here from our factory. Contact us for pricelist.

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