7.5 HP / 5.5 KW 3-Phase Motor

Introduction to 7.5 HP / 5.5 KW 3-Phase Motors

When industrial applications demand more torque, higher reliability, and continuous performance, the 7.5 HP / 5.5 KW 3-phase motor becomes a natural choice. It’s powerful without being oversized, robust without being complicated, and efficient enough to keep operating costs under control. From heavy pumps to large compressors, this motor size plays a critical role in modern industry.

Think of it as the dependable workhorse—strong, steady, and always ready to pull its weight.

What Does 7.5 HP / 5.5 KW Mean in Motor Power Ratings?

Motor ratings describe how much mechanical power the motor can deliver at its shaft.

• 7.5 HP (Horsepower) is a traditional unit still widely used in many industries.

• 5.5 KW (Kilowatt) is the metric equivalent commonly used in electrical standards.

Both values represent the same output power, just expressed differently.

Why 3-Phase Motors Are the Industry Standard

Three-phase motors offer clear advantages over single-phase motors:

• Smooth and continuous torque

• Higher efficiency and better power factor

• Lower current for the same output power

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• Reduced vibration and longer lifespan

That’s why almost every industrial facility relies on them.

Horsepower vs Kilowatt: What’s the Difference?

HP to KW Conversion Explained

Here’s the simple conversion:

1 HP ≈ 0.746 KW

So:

• 7.5 HP × 0.746 ≈ 5.6 KW

This is why the motor is commonly rated and sold as 5.5 KW.

Torque, Speed, and Load Dynamics

A 7.5 HP motor provides significantly higher torque than smaller motors, making it ideal for applications with heavy starting loads or constant resistance, such as pumps operating under pressure or loaded conveyors.

Technical Specifications of a 7.5 HP / 5.5 KW 3-Phase Motor

Core Motor Specifications & Performance

Environmental & Operational Compatibility

1. Site Conditions

Victory motors operate reliably in most industrial environments:

• Temperature range: -15°C to +40°C (ideal for warehouses, factories, and outdoor shelters)

• Altitude: ≤1000 meters (compatible with urban plants, rural workshops, and low-to-moderate elevation facilities)

This versatility makes them suitable for global applications in non-extreme climates, with custom modifications available for extreme temperatures (-40°C to +50°C) or high-altitude sites (>1000m).

2. Insulation System

The motor’s insulation meets Class F (105K) performance standards (rated for 155°C continuous operation) and is validated via Class B (80K) testing. This dual compliance ensures an extended lifespan (20,000+ operating hours) and consistent reliability in 24/7 continuous-duty scenarios (e.g., manufacturing lines, water treatment pumps). For extreme-heat applications (e.g., foundries), Class H insulation (180°C max) is available as a customization.

3. Vibration & Noise Control

Engineered to Vibration Class A (low noise, minimal mechanical wear), our motors are ideal for precision equipment like packaging machines or medical tools. For quieter environments (e.g., laboratories) or sensitive instrumentation, Vibration Class B (smoother operation) can be requested to reduce operational disturbance.

4. Duty Cycle

Designed for Continuous Duty (S1) operation, our motors run indefinitely at rated load without overheating—perfect for non-stop applications: industrial pumps, ventilation fans, conveyor systems, and heavy machinery.

Electrical & Protective Features

1. Voltage & Frequency

Standard specifications: 380V/50Hz (global industrial grid standard). Customization options include:

• Single voltages: 200V–660V (e.g., 220V/60Hz for North America, 230V/50Hz for Europe)

• Frequency: 50/60Hz (or custom tuning for specialized needs like 400Hz aerospace applications)

Motors maintain optimal performance even with ±5% voltage fluctuations—critical for unstable power grids in remote or developing regions.

2. Motor Protection

Enhance safety and reduce downtime with optional PTC thermistors (overheat protection) or PT100 temperature sensors (real-time monitoring). These components trigger alerts or automatic shutdowns during overheating, preventing damage in high-load applications (compressors, conveyors) and lowering long-term repair costs.

3. Protection Class

Standard IP54/IP55 Ingress Protection (dust-tight, water-resistant) safeguards against particles and low-pressure water jets—ideal for humid/dusty workspaces (food processing plants, construction sites). For harsh environments (heavy rain, washdowns), IP65 (full dust tightness + high-pressure water resistance) is available on request.

4. Cooling & Ventilation

Victory-Motor uses Totally Enclosed Fan-Cooled (TEFC) technology (per IEC 60034-6, IC411):

• Seals the motor to block dust, moisture, and debris (critical for farms, mines, or dirty industrial areas)

• External fans ensure efficient heat dissipation, maintaining stable temperatures in high-torque, long-duration tasks

Construction & Material Quality

1. Winding

Constructed with 100% high-purity copper wire (not aluminum), our windings offer:

• Superior electrical conductivity (reduces energy loss and utility bills)

• Enhanced heat resistance (extends motor life in continuous operation)

• Better performance in high-load, long-duration tasks compared to alternative materials

2. Output Shaft

Standard cylindrical shaft with keyway; we offer custom shaft diameter/length (e.g., extended shafts for specific couplings, non-standard key sizes) to fit your equipment’s unique requirements.

Wiring Methods of 3-Phase Motor

Here’s a clear explanation of the two three-phase motor wiring methods:

Star (Y) Connection

• · Wiring Setup: The motor’s three winding ends (U2, V2, W2) are connected together (forming a "star" center point), while the three start ends (U1, V1, W1) connect to the three-phase power supply.

• · Key Electrical Traits: Line voltage (power supply voltage) is √3x winding voltage; line current equals winding current.

• · Common Use Case: Used for motors designed for high-voltage input (e.g., 380V supply with 220V windings) or to reduce startup current (e.g., in light-load applications like fans or small pumps).

Delta (△) Connection

• · Wiring Setup: The motor’s winding ends are connected in a closed loop: U2 to V1, V2 to W1, W2 to U1. The three-phase power supply connects to the junction points (U1, V1, W1).

• · Key Electrical Traits: Line voltage equals winding voltage; line current is √3x winding current.

• · Common Use Case: Used for motors designed for low-voltage input (e.g., 220V supply with 220V windings) or high-torque applications (e.g., compressors, conveyors, heavy machinery).

Victory-Motor’s Manufacturing & Quality Assurance

1. Sufficient Raw Material Inventory

Victory-Motor maintains a robust, high-grade raw material inventory (premium copper windings, high-strength steel laminations, durable aluminum housings) sourced from certified global suppliers. This eliminates production delays, enables quick responses to urgent orders or sudden demand spikes, and ensures your projects stay on schedule—whether you need standard models or custom solutions.

2. Professional Production Equipment & Assembly Lines

Victory-Motor workshop features state-of-the-art equipment:

• CNC machining centers (precision component manufacturing)

• Automatic winding machines (consistent coil quality)

• Intelligent testing systems (real-time performance validation)

Fully automated assembly lines reduce human error, boost production efficiency, and ensure every motor meets international quality standards. We continuously upgrade equipment to align with the latest industry advancements.

3. 100% Quality Inspection

Quality is Victory-Motor cornerstone. Victory-Motor implements rigorous 100% inspection across the entire production process:

• Raw material verification (ensures compliance with specifications)

• In-process checks (monitors component accuracy)

• Final testing (assesses efficiency, torque, vibration, and insulation resistance via dynamometers, testers, and analyzers)

Adhering to the ISO 9001 quality management system, Victory-Motor guarantees defect-free motors that perform optimally in your applications.

Customization & Delivery Solutions

1. OEM/ODM Services

Victory-Motor offers comprehensive OEM/ODM services tailored to your unique needs:

• Collaborate with our engineers from design to final production

• Customize power, speed, size, voltage, housing, or branding (produce under your logo)

• Transparent processes and strict IP protection (confidentiality agreements included)

Leveraging our R&D and production expertise, we deliver cost-effective, high-performance solutions that align with your business goals.

2. Export-Standard Packaging & Delivery

Victory-Motor uses ISPM 15-compliant export-standard wooden boxes (high-density, moisture-resistant plywood) with foam padding and plastic wrapping for internal protection. This packaging:

• Complies with global customs regulations

• Prevents damage from impact, humidity, or rough transit

• Can be customized for large/special-shaped orders

You can trust your motors will arrive on time and in perfect working condition, no matter your global destination.

3. Quality Assurance & Warranty

Every motor is built to ISO 9001 standards, ensuring consistent manufacturing quality and compliance with global industrial regulations. We back our products with an 18-month warranty: if a motor is damaged by non-human factors (e.g., manufacturing defects) within this period, we replace it free of charge.

Parameter Table

Design and Construction Features

Stator and Rotor Design

The stator creates a rotating magnetic field, while the rotor—usually a squirrel cage type—follows it smoothly. This simple design ensures durability and minimal maintenance.

Insulation Class and Thermal Protection

Class F insulation allows higher temperature tolerance, improving reliability in demanding environments.

Cooling Methods and Enclosure Types

• TEFC (IC411): Standard for most industrial uses

• Forced Ventilation (IC416): Ideal for variable-speed or high-load applications

Types of 7.5 HP / 5.5 KW 3-Phase Motors

Induction Motor

The most common choice due to simplicity and reliability.

Squirrel Cage Motor

Low maintenance and excellent for continuous-duty applications.

Slip Ring Motor

Used when very high starting torque is required, though less common at this power rating.

Applications of 7.5 HP / 5.5 KW 3-Phase Motors

Industrial Applications

• Heavy-duty pumps

• Air and gas compressors

• Conveyors and crushers

• Mixers and agitators

Commercial Applications

• HVAC systems

• Cooling towers

• Large ventilation fans

Agricultural and Infrastructure Uses

• Irrigation pumping systems

• Water treatment plants

• Grain processing equipment

Advantages of Using a 7.5 HP / 5.5 KW 3-Phase Motor

High Starting Torque

Perfect for applications that require strong startup performance.

Energy Efficiency

Lower losses translate into lower operating costs over time.

Long Service Life

Designed for continuous operation with minimal downtime.

Installation and Wiring Considerations

Electrical Connections

Proper cable sizing, overload protection, and earthing are essential for safe operation.

Star-Delta Starting

• Star: Reduces starting current

• Delta: Delivers full torque during normal operation

Mounting Options

Common mounting arrangements include:

• B3: Foot-mounted

• B5: Flange-mounted

• B35: Foot and flange

Maintenance and Troubleshooting

Routine Maintenance Checklist

• Check bearing condition

• Measure insulation resistance

• Ensure cooling airflow is unobstructed

Common Problems and Solutions

• Overheating → Improve ventilation or reduce load

• Noise → Inspect bearings and alignment

• Vibration → Balance load and shaft

How to Choose the Right 7.5 HP / 5.5 KW 3-Phase Motor

Load Type and Duty Cycle

Understand whether your load is constant, variable, or requires high starting torque.

Operating Environment

Harsh environments may require higher IP protection or special coatings.

Efficiency Class Selection (IE2, IE3, IE4)

IE3 motors are often the best balance between upfront cost and long-term energy savings.

Conclusion

The 7.5 HP / 5.5 KW 3-phase motor is a reliable, efficient, and powerful solution for demanding industrial applications. It bridges the gap between medium and heavy-duty motors, offering strong performance without unnecessary complexity. With the right selection, installation, and maintenance, this motor can deliver dependable service for decades.

FAQs

1. Is 7.5 HP the same as 5.5 KW?

Yes, approximately. 7.5 HP converts to about 5.6 KW and is commonly rated as 5.5 KW.

2. Can a 7.5 HP motor be used with a VFD?

Yes. Using a VFD improves speed control and energy efficiency.

3. What frame size is common for a 5.5 KW motor?

IEC Frame 132S or 132M is most common.

4. What industries use 7.5 HP 3-phase motors?

Manufacturing, HVAC, water treatment, agriculture, and material handling.

5. How long does a 7.5 HP 3-phase motor last?

With proper maintenance, 15–20 years or more is typical.

Installation Methods of 3-Phase Motor

Here’s a structured overview of the 18 3-phase motor mounting types:

1. IM V1 (IM 3011)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (no base feet)

• · Frame size: 63–355

• · Power range: ~0.12 kW to 1,000+ kW

• · Applications: Pumps, mixers, vertical compressors (equipment requiring vertical shaft alignment)

2. IM V3 (IM 3031)

• · Orientation: Vertical (shaft upward)

• · Mounting: Flange (no base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Vertical fans, hoists, small vertical pumps

3. IM V5 (IM 1011)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (with base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Industrial mixers, vertical conveyors, compact vertical processing equipment

4. IM V6 (IM 1031)

• · Orientation: Vertical (shaft upward)

• · Mounting: Flange (with base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Small vertical compressors, lift mechanisms, vertical material handlers

5. IM B14 (IM 3601)

• · Orientation: Horizontal

• · Mounting: Small flange (end-mounted, no base feet)

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Pumps, fans, food processing machines, agricultural equipment

6. IM V15 (IM 2011)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (special base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Heavy-duty vertical pumps, marine equipment, offshore machinery

7. IM V17 (IM 2111)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (side-mounted base feet)

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Compact mixers, vertical conveyors, laboratory processing equipment

8. IM V18 (IM 3611)

• · Orientation: Vertical (shaft upward)

• · Mounting: Flange (side-mounted base feet)

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Small hoists, vertical fans, material lifting systems

9. IM V19 (IM 3631)

• · Orientation: Vertical (shaft upward)

• · Mounting: Flange (special base feet)

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Offshore pumps, compact vertical compressors, marine equipment

10. IM B34 (IM 2101)

• · Orientation: Horizontal

• · Mounting: Base feet + side flange

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Conveyors, industrial mixers, machinery requiring dual mounting options

11. IM V35 (IM 2031)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (extended base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Large vertical pumps, mining equipment, heavy-duty mixers

12. IM V37 (IM 2131)

• · Orientation: Vertical (shaft downward)

• · Mounting: Flange (offset base feet)

• · Frame size: 63–132

• · Power range: ~0.12 kW to 75 kW

• · Applications: Compact vertical machinery, medical equipment, precision processing tools

13. IM B3 (IM 1001)

• · Orientation: Horizontal

• · Mounting: Base feet (no flange)

• · Frame size: 63–355

• · Power range: ~0.12 kW to 1,000+ kW

• · Applications: Blowers, compressors, cutting machines, industrial pumps (general heavy machinery)

14. IM B5 (IM 3001)

• · Orientation: Horizontal

• · Mounting: Flange (no base feet)

• · Frame size: 63–280

• · Power range: ~0.12 kW to 500 kW

• · Applications: Pumps, fans, automation equipment, conveyor systems

15. IM B6 (IM 1051)

• · Orientation: Horizontal

• · Mounting: Small flange (end-mounted, with base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Small pumps, laboratory machinery, light industrial equipment

16. IM B7 (IM 1061)

• · Orientation: Horizontal

• · Mounting: Special flange (end-mounted, with base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Precision machinery, textile equipment, small processing tools

17. IM B8 (IM 1071)

• · Orientation: Horizontal

• · Mounting: Extended flange (end-mounted, with base feet)

• · Frame size: 63–160

• · Power range: ~0.12 kW to 110 kW

• · Applications: Food processing machines, packaging equipment, small industrial pumps

18. IM B35 (IM 2001)

• · Orientation: Horizontal

• · Mounting: Base feet + flange

• · Frame size: 63–355

• · Power range: ~0.12 kW to 1,000+ kW

• · Applications: Multi-purpose machinery, compressors, large pumps (flexible installation needs)

Induction Motor & Gear Reducer for Sale – Leading Manufacturer and Supplier

• · Leading AC Electric Motor and Reducer Manufacturer Since 2007

• · Offer one step OEM&ODM service

• · Offer warranty period of 18-month, compared with common 12-month in motor industry

• · More than 15,000 square meters of factory area with more than 50 employees

• · 11 production lines and annual output of 300,000 sets of motors

• · 100% quantity inspection before delivery

• · More than 20 patent certificates and CE, CCC, ISO9001 certificate

• · Trade with customers in more than 80+ countries and 100+ successful cases

Video of Victory-Motor ---- Induction Motor & Gear Reducer Manufacturer

Trust Victory Machinery Technology Co., Ltd. for Your Motor Solutions

Victory Machinery Technology Co., Ltd. offers a wide selection of top-tier AC induction motors and related products designed to provide optimal efficiency, reliability, and performance across various industries. Whether you’re looking for high-efficiency motors, explosion-proof solutions, or customized products, the company stands as a trusted manufacturer capable of meeting the unique needs of the global market. With its commitment to quality, innovation, and customer satisfaction, Victory Machinery Technology Co., Ltd. is your ideal partner for all your motor solutions.

Sufficient raw material inventory

At Victory Machinery Technology Co., Ltd., we maintain a robust and sufficient raw material inventory to ensure uninterrupted production and timely delivery of your AC induction motor orders. We source only high-grade raw materials—including premium copper windings, high-strength steel laminations, and durable aluminum housings—from certified global suppliers, adhering to strict quality standards. This abundant inventory not only eliminates production delays caused by material shortages but also enables us to quickly respond to urgent customer requests and sudden order increases. Whether you need standard motor models or customized solutions, our well-stocked raw material warehouse lays a solid foundation for efficient production, ensuring that your projects stay on schedule.

Professional production equipment and assembly lines

Victory Machinery Technology Co., Ltd. boasts state-of-the-art professional production equipment and fully automated assembly lines, which are the core of our high-quality motor manufacturing. Our production workshop is equipped with advanced CNC machining centers, precision stamping machines, automatic winding machines, and intelligent testing equipment, ensuring every component of the AC induction motor is manufactured with exceptional precision. The automated assembly lines streamline the production process, reducing human error while significantly improving production efficiency. We continuously invest in upgrading our equipment and optimizing production workflows to keep pace with the latest technological advancements in the motor industry. With our professional production capabilities, we can consistently deliver motors that meet or exceed international quality standards, providing you with reliable performance and long service life.

100% quality inspection

Quality is our cornerstone. We implement 100% rigorous quality inspection throughout production—from raw material verification to final product testing. Using advanced equipment (dynamometers, insulation testers, vibration analyzers), our QC team assesses key performance indicators. Adhering to ISO 9001, we guarantee defect-free motors that perform optimally in your applications.

Offer OEM/ODM service

We offer comprehensive OEM/ODM services tailored to your unique needs. Our experienced engineers collaborate with you from design to understand application requirements and branding needs—customizing power, speed, size, voltage or housing, or producing under your brand. Leveraging strong R&D and production experience, we deliver cost-effective, high-performance solutions with transparent processes and IP protection.

Export standard wooden box: Strong packing to ensure good condition on arrival

We use ISPM 15-compliant export-standard wooden boxes for packaging, with foam padding and plastic wrapping for internal protection. This high-density, moisture-resistant packaging complies with global customs regulations and prevents damage during transit. Custom packaging for large/special orders ensures safe delivery. You can trust your motors will arrive on time and in perfect condition worldwide.

Q1: What Information Should I Provide When Choosing a Motor, Gearbox, or Speed Reducer?

A1: The most effective way to select the right motor or gearbox is by providing a motor drawing with relevant parameters. Our engineers will review this information and recommend the most suitable model for your application. Alternatively, you can provide the following specifications:

1. 1. Type, model, power, and torque.

2. 2. Desired ratio or output speed.

3. 3. Working conditions and connection method.

4. 4. Quantity and machine name for installation.

5. 5. Input mode and input speed.

6. 6. Motor brand/model or flange and motor shaft size.

Q2: Are You a Manufacturer?

A2: Yes, we are a professional manufacturer of motors and reducers with 20 years of experience, located in Changzhou, Jiangsu, China.

Q3: What is Your Delivery Time?

A3: Our delivery time is approximately 10 days for sample orders and 15 days for bulk container orders.

Q4: Can I Get a Sample First?

A4: Absolutely! We would be happy to provide a sample for testing before you place a formal order.

Q5: What is Your Minimum Order Quantity (MOQ)?

A5: The MOQ is 1 piece per model for factory-branded products and packaging. For OEM branding and packaging, the MOQ is 50 pieces per model.

Q6: Do You Provide OEM/ODM Services?

A6: Yes, we are a premium OEM/ODM manufacturer, certified by independent third-party assessments.

Q7: How Does Your Factory Ensure Quality Control?

A7: Quality is our top priority. We follow a strict quality control system throughout the production process. Our QC team monitors quality at every stage and performs tests before each shipment to ensure high standards.

Q8: What Are Your Warranty Terms?

A8: We offer 18 months warranty, starting from the shipping date, as specified in the Bill of Lading (B/L).

Q9: How Do You Maintain Long-Term and Strong Business Relationships?

A9: We value our customers and ensure long-term relationships by:

1. · Providing high-quality products at competitive prices to benefit our customers.

2. · Treating each customer as a friend and conducting business with sincerity, regardless of their location.