3-Phase Inverter Duty Motor 55kW 75Hp

The 3-phase 55kW 75Hp inverter duty motor is a modern generation electric motor, applying advanced inverter technology to control input frequency and voltage. As a result, both rotation speed and torque are precisely adjusted, helping the motor operate stably, save energy, and enhance service life.

Overall design of the 3-Phase Inverter Duty Motor 55kW 75Hp

The inverter duty motor is built with a solid cast-iron one-piece housing with high load-bearing capacity, helping reduce vibration and improve durability during operation. The motor surface is coated with electrostatic paint to resist oxidation, effectively protecting against harsh environmental agents such as dust, moisture, and corrosive chemical vapors.

A prominent design feature is the forced cooling fan positioned at the rear, providing a powerful airflow to help the motor maintain a stable temperature even when operating at low speeds or under heavy load conditions for long periods.

Detailed structure of the inverter duty motor

The inverter duty motor is a 3-phase electric motor with a sturdy structure consisting of the main parts:

• Stator: Uses pure copper wire, ensuring good power transmission efficiency and limiting thermal losses.
• Rotor: Pressed from multiple electrical steel sheets, enhancing durability and operating efficiency.
• Terminal box: Designed with two separate compartments, one for the main power supply and one for the forced cooling fan, supporting easy and safe connection.
• Forced cooling fan: Operates separately, creating a stable airflow to help the motor run continuously in heavy-duty environments.
• Inverter circuit: Allows flexible frequency changes, helping smooth startup, reducing starting current, and enhancing safety for the entire system.

Classification of the 3-Phase Inverter Duty Motor 55kW 75Hp

The 3-phase 55kW 75Hp inverter duty motor is classified by the number of poles as follows:

3-phase 55kW 75Hp 2-pole inverter duty motor (2800-3000 rpm)

Features high rotation speed, suitable for applications requiring large flow and fast response. Combining with a variable frequency drive helps operate stably, save energy, and flexibly adjust speed.

Technical specifications

Frame size	250M
Shaft diameter	60mm
Keyway	18
Flange diameter	550mm
Dimensions	930mm * 490mm * 615mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications

• Heavy industry & Mining: Widely applied in mineral extraction and building material production systems.
• High-pressure pumping systems: Used in high-capacity industrial centrifugal pump systems, water supply and drainage pump stations, or fire protection systems.
• Processing & Industrial production: Used for processing lines, crushers, and high-airflow, high-pressure industrial fans.

3-phase 55kW 75Hp 4-pole inverter duty motor (1,400 – 1,500 rpm)

Features balanced speed and torque, suitable for many industrial systems. The variable frequency drive helps the motor operate stably, save energy, and control speed effectively.

Technical specifications

Frame size	250M
Shaft diameter	65mm
Keyway	18
Flange diameter	550mm
Dimensions	930mm * 490mm * 615mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Industrial pump and fan systems: Operating large-capacity centrifugal pump systems, water supply pumps, fire protection pumps, or industrial exhaust and blow fans.
• Mining & material industry: Used in stone crushing lines, mineral extraction, conveyor systems, and heavy bucket elevators.
• Processing and manufacturing: Providing driving force for air compressors, grinders (pepper, cashew, etc.), and industrial pressing systems.

3-phase 55kW 75Hp 6-pole inverter duty motor (900 – 1,000 rpm)

Features high torque and stable rotation speed, suitable for heavy-duty applications. Combining with a variable frequency drive helps flexibly control speed, operate smoothly, and save energy.

Technical specifications

Frame size	280S
Shaft diameter	75mm
Keyway	20
Flange diameter	550mm
Dimensions	1055mm * 550mm * 680mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Building materials: Providing strong rotational force for soil compactors, building material production equipment, and transmission mechanisms combined with a gearbox.
• Fans and Blowers: Applied to manufacture centrifugal fans, large industrial exhaust fans, or oxygen air blowers in aquaculture (shrimp, fish).
• Industrial pumps: Installed in high-capacity centrifugal pump systems, high-head pumps, water suction pumps, or oil pumps.

3-phase 55kW 75Hp 8-pole inverter duty motor (700 – 750 rpm)

Suitable for applications requiring low speed and high torque. The variable frequency drive helps the motor operate stably, reduce vibration, and optimize efficiency for heavy-duty systems.

Technical specifications

Frame size	250M
Shaft diameter	80mm
Keyway	22
Flange diameter	550mm
Dimensions	1280mm * 635mm * 845mm
Mounting type	Foot mount (B3), Flange mount (B35, B5, B14)
Protection class	IP55
Insulation class	Class F

Applications:

• Mineral mining & Building materials: Stone crushers, ore grinders, brick pressing machines, heavy material transport conveyors.
• Heavy industry: Chemical mixing systems, industrial presses, steel rolling mills, or high-capacity exhaust fans.
• Water & Environmental treatment: High-capacity centrifugal pumps, water supply and drainage pumps, or aquaculture air blower systems.

With diverse configuration options, the 3-phase 55kW 75Hp inverter duty motor effectively meets requirements from pump and fan systems to industrial production and mining lines. Contact hotline 0909.539.175 for Thanh Thai Motor to assist you in selecting the right product for your actual operating requirements.

Which gearboxes can be combined with the 3-phase 55kW 75Hp inverter duty motor?

• Heavy-duty gearbox: K, R, F series; NMRV gear motor
• Worm gearbox: WPO, WPS, WPX, WDA

In addition, it can be combined with:

• pulley and shaft coupling: shaft 65mm to 75mm

Instructions for wiring a 3-phase electric motor

Step 1: Preparation and opening the motor terminal box

• Use a manual screwdriver to remove the 4 fixing screws on the terminal box cover located on top of the motor body.
• Ensure that the motor capacity matches the requirement; in the video, the motor used has a capacity of 1.5kW, a speed of 1400 rpm, and a shaft diameter of 24mm.

Step 2: Identifying connection positions

• After opening the cover, you will see the terminal block consisting of 6 terminals.
• For a 3-phase 380V power supply, the 3 power supply wires will be connected to the 3 upper terminal positions, corresponding respectively to the markings U1, V1, and W1 on the terminal block.

Step 3: Connecting the wires

• Use wire strippers and crimping pliers to prepare the 3 power supply wire ends.
• Insert each power supply wire end into the positions of terminals U1, V1, and W1, then use pliers to tighten the screws fixing the conductors to the terminals to ensure the best electrical contact.

Step 4: Final inspection

• After completing the 3-phase connection, check all connections again to ensure firmness and no short-circuiting.
• Proceed to close the terminal box cover and supply power to start the motor.

The 3-Phase Inverter Duty Motor 55kW 75Hp is a suitable solution for many industrial systems thanks to its flexible speed control, stable operation, and energy-saving capabilities. To better understand the structure, technical specifications, and practical applications, customers can refer to the electric motor video and summary video updated below the article.

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