Water-Cooled Motors

In today pursuit of the equipment compactness and the peak performance, traditional air cooling often falls short in dissipating heat from continuous, high power output. The water-cooled motors are innovated according this by integrating the liquid cooling circuit directly into the motor. This efficient system removes heat at the source, fundamentally overcoming the thermal limitations of the high-load operation. The result is the motor capable of delivering greater power within the smaller footprint, making it ideal for complex applications with space constraints, high ambient temperatures or stringent noise requirements.

Unmatched Thermal Management and Stability

The cooling liquid circulates directly around the motor housing and the stator core, providing exceptionally efficient heat transfer. This rapidly draws heat away from the interior, significantly lowering the winding temperature rise. This not only extends insulation life but also prevents performance degradation or demagnetization due to overheating, ensuring long-term torque stability.

Compact Design and High Power Density

By eliminating reliance on external airflow for cooling, the motor housing can be designed more compactly and the removal of external fans reduces operating noise. This streamlined design offers greater flexibility in overall equipment layout, enabling the integration of the more powerful driven unit within the confined space.

The Water-cooled pmsm motors utilize the integrated circulating cooling system that directly targets heat-generating components for highly efficient heat dissipation. This design significantly increases power density and operational stability, making it particularly suitable for the applications with restricted cooling conditions or high ambient temperatures. Capable of maintaining reliable output during long-term and heavy-duty operation, these motors are widely used in injection molding machines, die-casting equipment, large-scale fans and specialized electric driven systems.

In high-performance engineering, thermal management isn’t just a feature—it’s the foundation of reliability. Traditional air-cooled Permanent Magnet Synchronous Motors (PMSMs) hit a wall where airflow fails to dissipate heat from the core, leading to magnetic flux weakening and irreversible magnet degradation. Our Water-Cooled PMSM series rewrites this limitation by moving the cooling mechanism directly to the source.

We utilize a spiral-groove cooling jacket seamlessly integrated into the stator frame. This design water-cooled pmsm maximizes the surface area contact with the laminations, allowing for rapid heat extraction without increasing the motor’s physical envelope. Under rigorous dynamometer testing, our units maintained a stable 40°C temperature rise at 100% duty cycle, delivering a sustained 97.2% efficiency rating. This translates to a 40% increase in power density compared to standard fan-cooled equivalents.

For system designers, this means eliminating the need for oversized pmsm motors to compensate for thermal derating. You gain valuable space in compact installations like EV battery electric vehicles (BEVs) and autonomous mobile robots (AMRs). Furthermore, the elimination of forced-air fans drastically reduces acoustic noise and prevents the ingestion of abrasive dust and humidity, extending bearing life in harsh industrial environments such as marine propulsion and heavy machining.

From precision CNC machining centers requiring thermal stability to prevent tolerance drift, to high-torque AGVs operating continuously, our liquid-cooled technology provides the thermal headroom necessary for mission-critical uptime. Stop managing heat and start leveraging it.

Key Features

Utilizing an internal circulating coolant to dissipate heat directly from core components, water-cooled motors achieve exceptional thermal exchange efficiency and precise temperature control. This enables a significantly higher continuous power output per unit volume compared to traditional air-cooled motors. The absence of external fans results in quieter operation, while the compact overall design facilitates integration into space-constrained equipment. Performance remains highly reliable even in demanding environments, largely unaffected by external high temperatures or dusty conditions.

Stable, High-Load Operation

The precision-engineered liquid cooling system maintains low winding temperature rise, ensuring consistent, stable performance during prolonged operation at rated power or during short-term overloads.

Enables High Power Density Design

Efficient internal heat dissipation allows for a more compact motor design, delivering greater power within the same installation footprint and enabling equipment downsizing and performance upgrades.

Creates a Quieter Operational Environment

By eliminating cooling fans entirely, the primary source of aerodynamic noise is removed, significantly reducing overall equipment noise for a more comfortable workspace.

Resilient in High-Temperature & Dusty Conditions

Cooling performance relies on the sealed fluid circuit, making it largely independent of external hot air or dust accumulation. This offers a clear reliability advantage in harsh environments such as foundries or chemical plants.

Simplifies Integration and Maintenance

The compact, integrated design minimizes external cooling accessories, streamlining equipment layout. The closed-loop cooling system also reduces the frequency of maintenance required to clean contaminated heat exchangers.

Technical Specifications

Power Range: Covering a broad spectrum from medium-power models in the tens of kilowatts to high-power applications reaching several megawatts, offering proven solutions for diverse industrial drives.

Rated Voltage: Compatible with multiple standard industrial voltages such as 380V, 480V, and 690V. Higher voltage ratings are available upon request to suit various drive system requirements.

Efficiency Class: The series consistently meets the IE4 super-premium efficiency standard, with select models achieving IE5 classification. Exceptionally low internal losses minimize heat generation, complementing the water-cooling advantage.

Power Factor: Optimized electromagnetic design delivers a high power factor at rated load, reducing reactive power loss in lines and improving the overall efficiency of the power supply system.

Protection Class: Standard protection rating of IP54 provides effective defense against dust and water splashes. Higher protection levels for components like the terminal box are available based on application needs.

Frame Material: Typically constructed with high-strength cast iron or aluminum alloy housings integrated with optimized cooling water jackets, ensuring structural rigidity and uniform coolant flow.

Cooling Method: Employs forced-circulation water cooling (ICW71), where coolant circulates through dedicated passages in the housing to remove heat, offering far superior heat dissipation compared to air cooling.

Insulation Class: Utilizes Class F or Class H insulation systems, treated with Vacuum Pressure Impregnation (VPI) to ensure reliable insulation performance even in the presence of coolant and under high temperatures.

Mounting Type: Available in internationally standard configurations including B3 (foot-mounted), B5 (flange-mounted), and B35, facilitating easy integration with various host equipment.

Bearing Type: Equipped with heavy-duty deep groove ball bearings or cylindrical roller bearings selected based on load, featuring long-life grease or oil lubrication and high-quality seals for extended service life.

Starting Torque: Provides ample starting torque, typically exceeding 150% of the rated value, ensuring reliable startup under heavy load conditions and rapid acceleration to operating speed.

Breakdown Torque: High overload capacity with a substantial breakdown torque ratio, generally over 200% of the rated torque. This allows the motor to easily handle instantaneous load surges during equipment operation.

Noise Level: With the elimination of cooling fans, the primary noise source is electromagnetic. Overall operating noise is significantly lower than comparable air-cooled models, typically controlled below 70 dB(A).

Vibration Level: Features a high-precision rotor dynamic balance and a rigid overall structure, resulting in low operational vibration that meets the “Good” grade according to ISO standards, ensuring smooth equipment performance.

Duty Cycle: Designed for S1 continuous duty. Leveraging its superior cooling capacity, it is particularly suited for demanding applications involving prolonged full-load operation or periodic heavy-duty cycles, such as S3 duty.

Operating Temperature: The recommended maximum coolant inlet temperature is typically +35°C. Under this condition, the motor is guaranteed to deliver its rated output. Specific temperature rise limits comply with the relevant insulation class standards.

Altitude: Standard products are suitable for use at altitudes up to 1000 meters. For operation at higher altitudes, the potential reduction in cooling efficiency must be considered, and power derating may be required.

Safety Certifications: Products have obtained mandatory national CCC certification. International certifications such as CE and UL are available upon customer request to meet market access requirements in various regions.

Warranty Period: We provide an 18-month product warranty from the date of manufacture, covering free repair or replacement for defects arising from materials or workmanship.

Compliance Standards: Design and manufacturing strictly adhere to relevant national (GB/T) and international (IEC) standards, ensuring the product meets industry requirements for electrical safety, performance parameters, and reliability.

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Motor Selection Guide and FAQ

Motor Selection Guide
1. Define Basic Parameters
Power & Speed:
Determine the required rated power based on load characteristics and define the motor pole count and speed range according to your equipment’s operational speed.
Voltage & Frequency:
Confirm your power supply standard (e.g., 380V/50Hz, 480V/60Hz). Custom designs are available for special voltage requirements.
Mounting Type:
Specify IEC standard mounting (e.g., B3, B5, B14). Custom the flanges & bases are also supported.
2. Consider Operating Environment
Protection Rating (IP):
IP55 for standard environments. IP65 is recommended for damp or dusty conditions. Hazardous areas require Ex D/Ex E certifications.
Insulation Class:
Class F (155°C) for general use. Class H (180°C) insulation is advised for high-temperature environments.
Cooling Method:
Self-ventilated (IC411) for standard applications. Forced air or water cooling is available for enclosed spaces or high-power-density scenarios.
3. Match Load Characteristics
Starting Torque:
Consider starting torque for fan/pump loads. Verify locked-rotor torque for conveying equipment.
Duty Cycle:
Standard motors are suitable for continuous operation (S1). Frequent start-stop cycles (S5) require reinforced bearings and insulation.
Efficiency Requirement:
Select IE3/IE4/IE5 efficiency classes based on annual operating hours. Ultra-premium efficiency (IE5) motors offer the lowest total cost of ownership for long-running applications.
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