3-Phase Electric Motor 3kW 4Hp

The 3-Phase Electric Motor 3kW 4Hp is a device that converts electrical energy into mechanical energy, directly serving machinery systems in small and medium-scale industry and agriculture. With a capacity of 3kW, the 3-Phase Motor 3kW well meets the requirements for continuous operation, mechanical stability, and optimized power consumption. The product is typically installed for pump systems, exhaust fans, conveyor belts, and processing machines.

General design of the 3-Phase Electric Motor 3kW 4Hp

The 3kW 4Hp 3-phase motor features a standard industrial design. The outer casing is cast from solid cast iron or aluminum to ensure rigidity and increase the contact area for heat dissipation. The motor shaft is machined from rust-resistant alloy steel, capable of withstanding good torsional forces. The entire casing surface is electrostatically painted to resist environmental corrosion. At the rear of the machine body, a cooling fan combined with a protective cover is arranged to support heat dissipation when the machine operates for a long time.

Internal structure of the 3-Phase Electric Motor 3kW 4Hp

Technically, the 3-phase electric motor consists of the following basic components:

• Stator: The stationary assembly component, constructed from assembled electrical steel laminations and pure copper windings. The function of the stator is to generate a rotating magnetic field when powered by a 3-phase 380V supply.
• Rotor: The rotating part placed snugly inside the stator. The rotor reacts with the stator’s magnetic field to generate pulling force (torque) that rotates the motor shaft.
• Motor housing: The metal protective casing with pre-cast ribs along the machine body to increase heat dissipation efficiency while preventing dust and water from entering the internal windings.
• Bearings: Fixed at both ends of the mechanical shaft, responsible for centering the rotor, minimizing friction, and helping the shaft rotate smoothly while limiting noise and vibration.
• Cooling fan: Mounted directly at the rear of the rotating shaft. Airflow from the fan blows along the ribs on the machine casing to continuously cool the entire motor block.

What types of 3-Phase Electric Motor 3kW 4Hp are available?

Based on the winding structure, the 3-Phase Electric Motor 3kW 4Hp is divided into 4 speed segments. Below are the detailed technical specifications of each type:

3-Phase Motor 3kW 4Hp 2 poles (2,800 – 3,000 rpm)

Technical specifications:

Code	100L
Shaft diameter	28mm
Keyway	8mm
Flange diameter	250mm
Weight	27kg
Dimensions	385mm * 215mm * 270mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Multi-stage centrifugal water pump: Used in domestic water supply pump stations, high-pressure fire fighting pumps requiring water to be pushed far away.
• Industrial centrifugal fan: Installed in ventilation, dust extraction, and smoke extraction systems for factories and workshops with large airflow.
• Mechanical processing machine: Applied to grinding machines, iron and steel cutting machines, wood sawing machines requiring fast rotation speed for smooth and precise cuts.
• Drying system: Used to blow hot air in agricultural product drying chambers and wood drying kilns.

3-Phase Motor 3kW 4Hp 4 poles (1,400 – 1,500 rpm)

This is the standard version, most widely used thanks to the balance between rotation speed and pulling force, with low heat generation during operation.

Technical specifications:

Code	100L
Shaft diameter	28mm
Keyway	8mm
Flange diameter	250mm
Weight	29kg
Dimensions	385mm * 215mm * 270mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Piston air compressor: Drives air compressor heads for mechanical workshops, auto garages, and car wash stations.
• Conveyor belt system: Combined with a gearbox to transport goods and components in assembly lines and packaging factories.
• Agricultural machinery: Drives livestock feed grinders, rice milling machines, and pellet press machines for households and small-to-medium farms.
• Agitator/mixer: Used for mixing low-viscosity liquid solutions and chemicals.
• High-pressure washer: Connected to specialized vehicle wash pump heads.

3-Phase Motor 3kW 4Hp 6 poles (900 – 1,000 rpm)

A motor series with slow rotation speed but providing strong pulling force. The casing frame is usually larger than the 2-pole and 4-pole series.

Technical specifications:

Code	132S
Shaft diameter	38mm
Keyway	10mm
Flange diameter	300mm
Weight	29kg
Dimensions	470mm * 275mm * 345mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Viscous solution mixer: Specialized for mixing paint, thick chemicals, mortar sludge, and high-viscosity solutions that require large resistance force.
• Screw conveyor, bucket elevator: Material handling systems for bulk raw materials such as cement, sand and stone, bagged grain, and animal feed in large volumes.
• Heavy-duty crusher: Drives medium-scale stone crushers, wood shredders, and scrap recycling crushers.
• Wastewater treatment system: Used for submersible mixers and aerators in treatment tanks.

3-Phase Motor 3kW 4Hp 8 poles (700 – 750 rpm)

Specially designed for extremely heavy loads. Very slow rotation speed to generate maximum pulling force. Large machine weight and dimensions.

Technical specifications:

Code	132M
Shaft diameter	38mm
Keyway	10mm
Flange diameter	300mm
Weight	29kg
Dimensions	510mm * 275mm * 345mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Overhead crane, hoisting winch: Used in elevator systems, tower cranes, electric cable hoists to lift heavy goods and construction materials requiring very large initial pulling force.
• Stamping machine, hydraulic press: Provides kinetic energy for high-pressure hydraulic pumps in deep drawing presses, press brakes, and plastic injection molding machines.
• Large capacity concrete mixer: Used for fresh concrete batch stations and centrifugal concrete mixers.
• Sludge dewatering machine: Plate and frame filter press systems, belt filter press systems in industrial wastewater treatment plants.

Which gearboxes can the 3-Phase Electric Motor 3kW 4Hp combine with?

The 3kW 4Hp motor can be assembled with various gearbox lines (speed reducers) through standard flange and shaft dimensions (28mm, 38mm, 42mm):

• Cast iron worm gearbox: WPA, WPS, WPX, WPO codes… (size 100 or 120 recommended).
• Aluminum housing worm gearbox: NMRV codes size 090, 110, or 130.
• Specialized heavy-duty gearbox: R-series (inline helical gearbox), S-series (helical worm gearbox), F-series (parallel shaft helical gearbox).
• Other transmission accessories:Pulleys, chain sprockets, or combined with a 4kW 5.5Hp brake motor unit (electromagnetic brake).

Instructions for connecting a 3-phase electric motor

Before starting, you should refer to electric motor videos to clearly understand the structure and terminal positions, making the operation more accurate and safer.

Step 1: Remove the terminal box cover of the electric motor

Use a suitable screwdriver to remove the 4 fixing bolts on the terminal box cover. When opening the cover, you will see the internal terminal system. With a common 3-phase motor, this area typically has 6 clearly labeled wire leads.

Step 2: Identify the connection terminals and 380V power supply

The wire leads are arranged in two rows. The bottom row, labeled U1, V1, W1, is the position used to supply input power to the motor.

Step 3: Connect the 3-phase power supply to U1, V1, W1

Prepare 3 phase wires from the 380V power supply and proceed to connect them respectively to terminals U1, V1, W1. Ensure correct positioning for stable motor operation.

Important safety note: Terminal lugs must be tightened securely to ensure good electrical contact, minimizing electrical sparks that can cause short circuits and fires. Do not connect power to the top terminal row (U2, V2, W2) as this may damage the motor windings.

Step 4: Close the cover and test run

After completing the connection, close the terminal box cover tightly and tighten the bolts to protect the equipment from dust and moisture. Supply power to check operation. If the motor rotates in the undesired direction, simply disconnect the power and swap the positions of any two of the three phase wires to reverse the rotation direction.

Performing the correct procedure not only helps the system operate stably but also ensures safety throughout use. Electric motor videos from Thanh Thai Motor will be a useful practical reference for users.

To learn more about products, quotations, and detailed instructions, you can access the comprehensive video collection in the electric motor video category – which provides complete practical content directly implemented by the technical team.

Warranty, shipping and commitment policy at Thanh Thai Motor

Warranty up to 24 months

All electric motor products distributed by Thanh Thai Motor are covered by a genuine warranty for up to 24 months. Customers who purchase electric motors can completely rest assured with a transparent, fast, and professional after-sales policy.

Nationwide Shipping

Thanh Thai Motor supports nationwide shipping for all electric motors sold, ensuring safe and on-time delivery to every province across the country. Whether you are in the North, Central, or South, we are ready to serve you.

European Standard Quality – German Technology

Thanh Thai Motor sells electric motors manufactured with German technology, meeting European quality standards, ensuring durability, high efficiency, and stable operation for a long period – suitable for the strict requirements of industrial electric motors.

Competitive Prices – Attractive Offers for Dealers and Wholesale Customers

We commit to reasonable motor prices, offering the best electric motor products with high discount policies for bulk purchasers and distribution units. The more you buy – the better the profit.

Quality Commitment – Powerful Operation, Power Saving

Thanh Thai Motor sells electric motors wound with 100% copper wire, helping the machine run powerfully, consume less electricity, operate smoothly, and effectively reduce vibration – extending equipment lifespan. When purchasing an electric motor, prioritizing products with 100% copper core will be a wise decision, bringing long-term value.

At Thanh Thai Motor, we provide a full range of products, with various phases and capacities, such as:

• 220V electric motors (or 220V 1-Phase electric motors) are 1-Phase electric motors commonly chosen for many household appliances and light industrial equipment, offering convenience and efficiency.
• 380V electric motors are 3-Phase electric motors using three-phase power, commonly used in heavy industrial applications.

Full CO, CQ Certification Documents

Thanh Thai Motor provides the best quality electric motors. Each imported electric motor product from Thanh Thai Motor comes with a Certificate of Origin (CO) and a Certificate of Quality (CQ), meeting the requirements for large projects, constructions, and strict technical documentation.

Contact for Purchase

Do you need to buy an electric motor or seek advice on choosing an affordable electric motor that suits your needs? Contact Thanh Thai Motor immediately using the methods below:

• WhatsApp: +84966596219
• Email: codienthanhthai@gmail.com