High Torque Brushless DC Motors- Suzhou Retek Electric Technology Co., Ltd.

High Torque BLDC Motor Technical Overview

These BLDC motors are engineered for applications demanding a high rotational force output within a compact structure. The design prioritizes magnetic circuit optimization, often incorporating high-energy density Rare-Earth Magnets (NdFeB, N45 grade or higher) and concentrated winding topology. This configuration increases the effective flux density by up to 15% compared to standard designs, directly resulting in enhanced torque output and superior acceleration capabilities. The controllers integrate advanced Field-Oriented Control (FOC) or trapezoidal commutation logic to maintain stable torque across the entire speed range, specifically benefiting starting conditions and heavy-load transitions. Operating voltage ranges are typically optimized for 24VDC to 48VDC industrial standards, ensuring broad compatibility with common power supply architectures, with specific models available up to 310VDC for high-power applications.

Focus Area: High starting torque, sustained load handling, and power-to-volume ratio.
Key Technology: Optimized stator slot filling, high-grade magnetic materials, and low inductance windings to maximize current rise time.
Thermal Management: Robust housing designs with integrated heat fins or provision for liquid cooling interface to dissipate heat efficiently and maintain performance stability under continuous high load.
Magnetic Circuit: Typically utilizes a 12-slot, 10-pole or similar high-pole-count configuration to increase the number of magnetic flux reversals per revolution, boosting torque.

Introduction

Detailed Parameters and Performance Data

Introduction to Torque-Optimized Motor Solutions

Developing dependable motion control systems requires components that can deliver precise and substantial power under varied, often harsh, loads. This series of high torque motors is a product of focused engineering on power density and long-term reliability. As a leading manufacturer specializing in industrial and specialized electric motor technology, Suzhou Retek Electric Technology Co., Ltd. (RTK) focuses on supplying OEM clients with drive systems that minimize downtime and maximize operational output in demanding industrial, material handling, and robotic environments.

Our production methodology integrates automated stator winding and meticulous magnet assembly processes under strict quality control, ensuring winding uniformity and consistent performance across all units designed for high-load cycles. We provide comprehensive technical support from initial prototyping to final volume production.

Applications

Advanced Technology Highlights

Key Application Areas

Industrial Robotics (Heavy Payloads): Joint actuation, base rotation, and manipulator movement requiring high holding torque and dynamic stiffness.
Material Handling Systems: High-acceleration conveyor belt drives, Automated Guided Vehicles (AGVs) requiring rapid start/stop, and heavy-duty lifting equipment.
High-Force Electric Actuators: Precision valve control in petrochemical plants, heavy gate openers, and industrial presses.
Renewable Energy Systems: Solar panel tracking (Heliostats) requiring substantial torque to overcome wind load.
Specialized Power Tools: High-torque demolition hammers, specialized construction tools, and industrial mixers.
Electric Vehicles (Low Speed/High Load): Small electric utility vehicles and golf carts.

Technical Specifications

Industrial & Commercial Usage

Selected Motor Specifications

Specifications are dependent on specific frame size, but the core characteristic is the high Kt (Torque Constant) value.

Parameter	Example BL76 Series (High Torque Variant)	Example BL112 Series (Heavy Duty)
Rated Torque (Nm)	1.2 - 2.5	4.0 - 6.5
Rated Power (W)	300 - 800	800 - 1500
Rated Voltage (VDC)	24 / 48	48 / 96
Torque Constant (Kt Nm/A)	0.12 - 0.25	0.30 - 0.50
Motor Inertia (g⋅cm2)	400−800	1500−3000
Peak Current (A)	30	55

Additional Information

Supplementary Details & Notes

Manufacturing Process and Customization Services

Our manufacturing facility utilizes advanced production lines focused on minimizing winding variability and ensuring consistent air gap tolerances. Each motor undergoes automated End-of-Line (EOL) testing for back-EMF, winding resistance, and torque characteristics under load before shipment.

Shaft Modification: Custom shaft lengths, diameters, keyways, spline options, and specialized coatings (e.g., black oxide) are available upon request.
Winding Customization: We offer specific Kv and torque constant tuning to meet unique application speed and power requirements, including options for delta (Δ) or wye (Y) winding configurations.
Encoder/Brake Integration: Motors can be fitted with integrated fail-safe holding brakes, multi-turn absolute encoders, or high-resolution inductive sensors for specialized motion control.
Environmental Sealing: Capabilities for meeting specific IP ratings, including full encapsulation of windings and specialized sealing for connectors and shaft egress.
Controller Matching: Provision of pre-tuned, matched motor control electronics to guarantee optimal system performance out-of-the-box.

Service & Support

Operational Benefits and Design Integrity

Sustained Force Output: Engineered magnetic circuit design delivers constant and highly predictable torque with minimal derating under continuous operation.
Exceptional Power Density: Achieves significant torque relative to its frame size, resulting in smaller footprints for high-load equipment.
High Dynamic Response: Low inductance and high Kt allows for rapid current delivery and torque response, crucial for dynamic servo applications.
Robust Environmental Sealing: Available with IP65 and IP67 ratings to resist dust, moisture, and liquid ingress in harsh manufacturing settings.
Flexible Feedback Integration: Offered with various integrated feedback devices, including resolvers, absolute encoders, and robust Hall sensors, for precise closed-loop control.

Frequently Asked Questions

Q: What is the primary difference between high torque and high speed motors?
A: High torque motors are optimized for power transfer and load handling, utilizing lower Kv (speed constant) and higher Kt (torque constant). This optimization involves more copper fill and stronger magnets. High speed motors prioritize higher rotational velocity, often resulting in a lower Kt.

Q: Can these motors be used with standard Variable Frequency Drives (VFDs)?
A: Traditional AC VFDs are not compatible. These motors are designed for use with dedicated brushless DC servo drives that handle the complex electronic commutation and feedback integration required for optimal performance and torque control.

Q: How do you manage heat in a high-torque BLDC motor?
A: Heat management relies on a multi-faceted approach: Optimized winding materials (Class H insulation), aluminum or cast iron housing acting as a heatsink, integrated cooling fans (forced air), and in the highest power models, liquid cooling jackets around the stator.

Q: What is the maximum continuous stall torque rating?
A: Continuous stall torque is typically about 20% to 30% of the motor's peak momentary torque, limited primarily by the motor's ability to dissipate the I2R heat generated by the continuous current required to maintain position.

Resources

Component Material Selection and Impact

Material choice is critical for the performance and durability of high-torque motors:

Magnet Grade: Employing N45 to N52 grade Neodymium (NdFeB) magnets provides the necessary high residual induction and coercivity to maximize flux density.
Lamination Material: High-grade, thin silicon steel laminations (0.2mm to 0.35mm) with low core loss are used to minimize energy wasted as heat, maintaining efficiency under load.
Winding Wire: Utilizing high-purity copper wire with a high thermal class (Class H or 200∘C) insulation ensures winding integrity under peak current and prolonged load conditions.
Housing: Precision-machined aluminum alloys or cast iron are used for effective heat conduction away from the stator and structural rigidity under high reaction forces.
Bearing System: Heavy-duty, deep groove ball bearings (e.g., C3 clearance) are selected to manage high radial and axial shaft loads.

About Suzhou Retek Electric Technology Co., Ltd.

Unlike other motor suppliers, Retek engineering system prevents the selling of our motors and components by catalogue as every model is customized for our customers. The customers are assured that every component they receive from Retek is designed with their exact specifications in mind. Our total solutions are a combination of our innovation and a close working partnership with our customers and suppliers.

As China High Torque Brushless DC Motors Manufacturers and Wholesale High Torque Brushless DC Motors OEM/ODM Suppliers, Retek business consists of three platforms: Motors, Die-Casting and CNC manufacturing and wire harness. Retek products are widely supplied for residential fans, vents, boats, airplanes, medical facilities, laboratory facilities, trucks and other automotive machines.

Welcome to send us an RFQ, it is believed you will get the best cost-effective products and services here!

Customized Solutions

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Suzhou Retek Electric Technology Co., Ltd.

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High Torque BLDC Motor Technical Overview

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