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Why choose us?
Shanghai Pinxing's Expertise in Thermal Management
At Shanghai Pinxing, we treat cooling system design as a core engineering competency, not an afterthought. We understand that the optimal cooling method depends on the application's specific constraints: ambient temperature, cleanliness of air, available utilities (water), and duty cycle. Our standard motors are offered with a range of IC codes. For demanding applications, our engineering team uses Computational Fluid Dynamics (CFD) software to model airflow and heat transfer, optimizing fin design, fan blade geometry, and internal air paths. This ensures our motors run cool and reliable, whether it's a standard TEFC motor in a factory or a custom water-cooled motor for a hot cement plant.
Providing Solutions for Thermal Challenges
We frequently solve customer problems related to overheating. Whether it's a motor that trips on overload in a high ambient, a VFD-driven motor that overheats at low speed, or a motor failing prematurely in a dusty environment, the solution often lies in the cooling system. We can recommend and supply upgraded cooling options, such as adding an independent blower (converting IC411 to IC416) or specifying a CACA enclosure (IC611) for severely dirty conditions. Our goal is to provide a motor that stays within its temperature class under your actual operating conditions.
Popular Industries And Applications
Variable Speed Drive (VFD) Applications
When a motor runs at reduced speed on a VFD, its integral fan (IC411) becomes ineffective, risking overheating at high torque. An independent blower (IC416) is required for constant torque operation across a wide speed range, common in conveyors, extruders, and winches.
High Ambient Temperature Environments
Near furnaces, in desert climates, or in engine rooms, ambient air cannot effectively cool the motor. Solutions include oversized cooling (larger fans, more fins), CACA coolers (IC611), or water cooling (IC81W) to reject heat to a separate medium.
Severely Dirty or Explosive Atmospheres
In cement, mining, or grain handling, ambient air is laden with dust that can clog TEFC motor fins. CACA (IC611) enclosures completely isolate the internal cooling circuit, protecting the motor while maintaining cooling performance.
High Power Density Applications
Large motors (>1000kW) and motors in confined spaces generate significant heat in a small volume. Water cooling (IC81W) offers the highest heat removal capacity per unit surface area, allowing for more compact designs.
Silent Operation Requirements
In hospitals, laboratories, or office buildings, fan noise from TEFC motors can be problematic. Water-cooled (IC81W) or separately ventilated motors with low-noise blowers can provide near-silent operation.
Hardcore Parameters
| Cooling Method (IC Code) | Description | Typical Max. Ambient Temp. | Advantages | Disadvantages / Applications |
| IC411 (TEFC) | Shaft-mounted fan blows air over frame fins | 40°C (standard) | Simple, self-contained, low cost | Cooling drops with speed; fins clog in dust |
| IC416 (Forced Vent.) | Separate electric blower provides constant air | 50°C+ (with adequate airflow) | Cooling independent of motor speed | Requires separate power supply; extra cost & noise |
| IC611 (CACA) | Internal closed circuit with air-to-air heat exchanger | 50-60°C | Protects internals from dirt/explosive atmospheres | Larger, heavier, higher cost than TEFC |
| IC81W (Water Cooled) | Internal closed circuit with water-cooled heat exchanger | Any (depends on coolant temp) | Highest cooling capacity, compact, silent | Requires clean water supply and plumbing |
1-Minute Selection Guide
Assessing Your Cooling Requirements
Ask: 1) **What is the maximum ambient temperature?** Above 40°C may require derating or enhanced cooling. 2) **Is the air clean or contaminated?** Dirty air necessitates CACA (IC611). 3) **Will the motor run on a VFD at low speed with high torque?** If yes, specify IC416. 4) **Is water available and is its use acceptable?** If yes and cooling demands are high, IC81W is an option. 5) **Are there noise restrictions?** Water cooling (IC81W) is quietest. Answering these guides the IC code selection.
Specifying Water Quality for IC81W Motors
If specifying water cooling, you must define the coolant requirements. Provide: **Water Quality:** Clean, non-corrosive, preferably treated (inhibitors). Specify maximum hardness, chloride content, pH. **Flow Rate & Pressure Drop:** The motor manufacturer will provide required flow (e.g., l/min) and the resulting pressure drop. **Inlet Temperature:** The maximum temperature of the cooling water at the motor inlet (typically <30°C for optimal cooling). **Connections:** Specify pipe thread size and type (e.g., G1").
Customized services
Cooling System Upgrade and Retrofit Kits
We offer upgrade kits for existing motors. For motors overheating in service, we can supply and fit independent blower (IC416) kits. For motors in newly dusty environments, we can sometimes provide external bolt-on air-to-air heat exchangers to supplement cooling while keeping contaminants out. We assess the motor and application to recommend the most effective retrofit solution.
Custom Cooling System Design
For unique applications—such as a motor that must be cooled by a specific process fluid, fit into an extremely tight space, or operate in an ambient temperature over 60°C—we offer custom cooling design services. This can involve designing special water jackets, integrating cooling tubes into the frame, or creating a hybrid cooling system. We model, prototype, and test to ensure the design meets the thermal challenge.
