![What is a Variable Frequency Motor]( "What is a Variable Frequency Motor")
Introduction to the 1.5 HP / 1.1 kW 3 Phase Motor
We consider the 1.5 HP / 1.1 kW 3 phase motor a critical power unit in industrial and commercial operations where higher torque and continuous-duty performance are required without moving into large motor territory. This motor size perfectly bridges the gap between light-duty and medium-duty machinery, making it one of the most commonly selected ratings in factories, processing plants, and infrastructure projects.
With increasing demand for energy-efficient, reliable, and low-maintenance electric motors, the 1.1 kW three-phase motor stands out as a dependable solution. It delivers consistent output, stable speed, and excellent thermal performance, even in demanding environments. From conveyors and pumps to compressors and industrial fans, this motor is engineered to perform reliably under prolonged operating conditions.
This comprehensive guide provides an in-depth look at the 1.5 HP / 1.1 kW 3 phase motor, covering specifications, working principles, efficiency, applications, advantages, selection guidelines, and maintenance best practices.
Understanding the Power Rating: 1.5 HP and 1.1 kW
The power rating of an electric motor is commonly expressed in both horsepower (HP) and kilowatts (kW) to align with international standards.
· 1.5 HP ≈ 1.1 kW
· Both values represent the same mechanical output power
· HP is widely used in legacy systems, while kW is the global industrial standard
This power level is ideal for equipment that requires higher starting torque and sustained load handling without excessive energy consumption. It is frequently selected where a 1 HP motor may be insufficient, but a larger motor would be inefficient or oversized.
How a 3 Phase Motor Operates
A 3 phase motor operates using three alternating currents, each phase offset by 120 degrees. This design generates a uniform rotating magnetic field, which allows the rotor to turn smoothly and efficiently.
Key Operating Characteristics
· Continuous and balanced torque output
· Smooth acceleration and deceleration
· Lower vibration and noise
· High electrical and mechanical efficiency
Unlike single-phase motors, three-phase motors do not require start capacitors or auxiliary windings. This results in simpler construction, fewer failure points, and longer operational life, especially in industrial environments.
![Centrifugal Compressors]( "Centrifugal Compressors")
Standard Technical Specifications of a 1.5 HP / 1.1 kW 3 Phase Motor
Rated Power | Frame Size | Pole | Rated Speed (RPM) | Efficiency (100%) | Power Factor (COS∅) | Rated Torque (N.m) | Weight (kg) |
kW | HP |
|
| 50Hz | 60Hz | IE2 | IE3 | IE4 | IE2 | IE3 | IE4 |
|
|
1.1 | 1.5 | 80 | 2 | 2880 | 3456 | 81.3 | 84.2 | 86.5 | 0.84 | 0.84 | 0.85 | 4.95 | 20 |
|
| 90S | 4 | 1445 | 1734 | 82.8 | 85.3 | 88.2 | 0.78 | 0.77 | 0.76 | 9.91 | 23 |
|
| 90L | 6 | 945 | 1134 | 79.8 | 82.5 | 85.9 | 0.72 | 0.74 | 0.71 | 15.1 | 29 |
|
| 100L | 8 | 685 | 822 | 70.1 | 72.8 | 82.6 | 0.70 | 0.71 | 0.69 | 20.6 | 40 |
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.
![motor component]( "motor component")
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.
![Chain Conveyor Systems]( "Chain Conveyor Systems")
Item | Specifications | Description | Customized items |
Motor Type | Three phase AC motor (squirrel-cage type) |
|
|
Motor Standard | IEC60034 | It is a standard for rotating motors formulated by IEC. |
|
Efficiency Level | IE2 / IE3 / IE4 | It meet IE2 IE3 IE4 energy efficiency grade of IEC60034. |
|
Voltage | 110/200/220/230/240/380/400/415/440/460/480/ 660/ 690V | The motors can work well within variations of ±5% from rated voltage. | It can be customized according to the voltage in your country |
Frequency | 50/60Hz | The motors can work in 50Hz or 60Hz. | It can be customized according to the frequency in your country |
Degree of protection | IP55 | The motor has dust-proof and water-proof performance of level 5. It is suitable for industrial scenarios where there is dust (diameter ≥ 1mm) and low-pressure water spraying. | It can be customized as IP65 |
Insulation Class | F | The maximum temperature that insulating materials can withstand for a long time is 155℃. | It can be customized as H |
Operating mode | S1 | Continuous working system |
|
Cooling Method | TEFC | Totally enclosed fan cooled in accordance with IC411 of IEC60034. |
|
Site Conditions | Temperature: -15°C to +40°C Altitude: ≤ 1000 m |
| It can be customized for environments with higher or lower temperature, and over 1000 meters. |
Winding | 100% copper wire |
|
|
Motor Protection | PTC/PT100 | PTC: thermistors protection PT100: resistance thormometers protection | As option |
Output Shaft | Standard size | Cylindrical with key | The diameter and length of shaft can be customized |
Paint color | Blue / Gray |
| It can be customized |
Nameplate | Victory brand standard |
| It can be customized |
Quality Assurance | ISO 9001 Quality System | Strict quality management standard, 100% quantity inspected |
|
Warranty Period | 18 months | We offer a new motor for free if the motor is damaged due to non-human factors within 18 months. |
|
Energy Efficiency and Performance Advantages
Energy efficiency is a decisive factor when selecting a 1.5 HP 3 phase motor. Compared to single-phase motors of similar output, three-phase motors offer:
Motors designed to meet IE3 and IE4 efficiency standards significantly reduce electricity consumption, especially in applications operating continuously or for extended hours. Over time, this translates into substantial cost savings and reduced environmental impact.
Common Applications of 1.5 HP / 1.1 kW 3 Phase Motors
We see this motor size used extensively across multiple industries due to its versatility and reliability.
Industrial Applications
· Conveyor systems
· Centrifugal and gear pumps
· Air compressors
· Industrial fans and blowers
· Mixers and agitators
· Machine tools and lathes
Commercial and Infrastructure Applications
Its ability to operate under continuous-duty conditions makes it ideal for systems where downtime is costly.
![Applications of 3-Phase AC Brake Motors]( "Applications of 3-Phase AC Brake Motors")
Speed Selection and Pole Configuration
Motor speed is determined by the number of poles in the stator:
· 2 Pole – approximately 3000 RPM
· 4 Pole – approximately 1500 RPM
· 6 Pole – approximately 1000 RPM
· 8 Pole – approximately 750 RPM
Selecting the correct speed ensures optimal performance and prevents unnecessary wear. For example, 4-pole motors are widely used in conveyors and pumps, while 2-pole motors are preferred for high-speed fans and compressors.
Mounting Arrangements and Installation Options
The 1.1 kW 3 phase motor is available in multiple mounting configurations, offering flexibility during installation:
· B3 (Foot Mounted) – Standard industrial mounting
· B5 (Flange Mounted) – Direct coupling to pumps or gearboxes
· B14 (Face Mounted) – Compact installations with limited space
This flexibility reduces mechanical modification requirements and simplifies system design.
Advantages of Using a 1.5 HP / 1.1 kW 3 Phase Motor
We identify several advantages that make this motor size a preferred industrial choice:
· High starting and running torque
· Smooth and quiet operation
· Minimal maintenance requirements
· Long operational lifespan
· Excellent compatibility with VFDs
· Stable performance under variable load
When combined with a variable frequency drive (VFD), the motor enables precise speed control, soft starting, and further energy savings.
![coal mine]( "coal mine")
How to Choose the Right 1.1 kW 3 Phase Motor
Selecting the right motor involves evaluating more than just power rating. We recommend considering:
· Load type (constant or variable torque)
· Operating speed requirements
· Available voltage and frequency
· Environmental conditions such as dust, moisture, and temperature
· Duty cycle (S1 continuous or intermittent)
· Efficiency and regulatory compliance
Proper selection ensures reliable performance and prevents premature motor failure.
Maintenance Practices and Service Life
With proper care, a 1.5 HP 3 phase motor can operate efficiently for many years. Recommended maintenance practices include:
· Routine bearing lubrication
· Periodic insulation resistance testing
· Cleaning of cooling fins and air passages
· Monitoring vibration, noise, and temperature
· Ensuring correct alignment and secure mounting
Preventive maintenance minimizes downtime and maximizes return on investment.
Conclusion
We regard the 1.5 HP / 1.1 kW 3 phase motor as a robust, efficient, and highly adaptable solution for a wide range of industrial and commercial applications. Its ability to deliver consistent torque, high efficiency, and long-term reliability makes it a smart investment for operations seeking dependable performance and energy optimization. With the right selection and maintenance strategy, this motor remains a cornerstone of modern electromechanical systems.
