A 3-Phase Electric Motor Over 3.7kW is a high-capacity electric motor specifically designed for industrial production systems and mechanical equipment requiring strong traction, continuous operation, and high durability. Powered by a 3-phase 380V power supply, this type of 3-phase electric motor delivers superior transmission efficiency, stable torque, and the ability to work under heavy loads for extended periods.
Overview of 3-Phase Electric Motor Over 3.7kW
Applications of 3-Phase Electric Motor Over 3.7kW
Industrial pump systems: Providing power for water pumps and chemical pumps, serving wastewater treatment plants, agricultural irrigation systems, and various other applications.
Air compressors: Used in pneumatic systems, supplying compressed air for industrial equipment and machinery such as drills, cutting machines, and paint spray guns.
Crushers and mixers: Applied in the construction industry and building material manufacturing, helping to crush and thoroughly mix raw materials.
Conveyor systems: Used in manufacturing plants and warehouses, helping to transport goods and materials continuously and efficiently.
Industrial fans: Applied in ventilation, cooling, and dust extraction systems, ensuring a well-ventilated and safe working environment in factories and production workshops.
Applications of 3-Phase Electric Motor Over 3.7kW
Advantages of 3-Phase Electric Motor Over 3.7kW
3-phase electric motors with a capacity of over 3.7kW possess many outstanding advantages, making them the top choice in numerous industrial applications.
High efficiency: 3-phase electric motors have higher energy conversion efficiency than 1-phase motors, helping to save electricity and reduce operating costs.
Good load capacity: With a robust design, 3-phase motors have a high load-bearing capacity, meeting the requirements for continuous and stable operation in harsh industrial environments.
Long lifespan: 3-phase electric motors are manufactured from high-quality materials under strict production processes, ensuring a long lifespan and minimizing maintenance and replacement costs.
Smooth operation: Compared to other types of motors, 3-phase electric motors operate more smoothly, minimize noise, and create a comfortable working environment for workers.
Easy maintenance: The simple design makes the maintenance and repair of 3-phase electric motors easy and quick, minimizing machinery downtime.
Advantages of 3-Phase Electric Motor Over 3.7kW
Price of 3-Phase Electric Motor Over 3.7kW
To help customers easily choose the right product, Thanh Thai Motor provides the latest price of 3-phase electric motors over 3.7kW. The price list below includes popular motor types, regularly updated to ensure accuracy.
Notes when buying 3-Phase Electric Motor Over 3.7kW
Voltage & wiring: Prioritize choosing types with 380V/660V (Δ/Y) specifications to enable the Star – Delta starting method, helping to reduce starting current and avoid voltage drops in the workshop grid.
Mounting type & dimensions: Clearly define whether the mounting type is Foot mount (B3) or Flange mount (B5, B35). For the 3.7kW (4-pole) type, the standard frame size is usually 112M with a 28mm shaft diameter (measure and compare if replacing an old machine).
Protection class & heat resistance: Choose dust/water resistance standards from IP55 upwards and Class F insulation to ensure the motor operates durably and safely in hot, humid, and dusty industrial environments.
Energy efficiency: It is recommended to choose motors meeting IE2 or IE3 standards to save energy consumption and optimize long-term operating costs for the business.
Thanh Thai Motor has built a video system summarizing product overviews, quotations, technical instructions, etc., helping customers have more information about the product before making a purchase decision. Customers can visit the electric motor video category for more details.
Frequently Asked Questions
Why do motors over 3.7kW connected to a 3-phase 380V grid have to be connected in Delta (Δ) and is it okay if they are mistakenly connected in Star (Y)?
Because motors over 3.7kW in Vietnam usually have 380V/660V (Δ/Y) specifications, meaning the winding reaches rated power at 380V when connected in Delta (Δ). If you mistakenly connect it in Star (Y), the motor will only receive a fraction of the voltage, leading to severe underloading (reaching only about 1/3 of the capacity), and running for a long time will cause overheating and burnout due to overload.
Why do large motors over 3.7kW often cause grid voltage drops upon starting and what are the solutions?
When starting directly, the current of a large motor will spike 5 to 7 times the rated current, causing local voltage drops and tripping protection devices. The solution is to use a Star – Delta starting circuit (running in Star for a few seconds to reduce current before switching to Delta) or install a Soft Starter / Variable Frequency Drive (VFD) so the motor accelerates gradually, protecting the workshop power grid.
What are the regulations for the periodic bearing maintenance procedure for these large motor lines?
Large motors are subject to very high loads and centrifugal forces. You need to pump heat-resistant grease periodically after every 2000 – 3000 running hours through the grease nipple attached to the shaft end connection cover (no need to disassemble the machine). Absolutely do not let the bearings run dry, because when the bearings are worn, it will cause shaft play, causing the rotor to rub against the stator and completely burn out the motor.
