China OEM 3/4HP Electric Motor 550W, 2800rpm Air Compressor Single Phase AC Motor with Best Sales

Product Description


This high performance electric motor that is super quiet and lightweight connects to 220-240V 50Hz household power and is excellent choice for workshops and DIY users. It is compact, but very powerful. High speed cooling fan with 2800rpm keeps the electric motor running in hours’ work which results in high efficiency for operator. Nice design that is made of die-casting alum housing and lower noise with around 70dB. IP54 protection makes it waterproof and dustproof for outdoor use. And it doesn’t matter that it has to cycle on more often because it’s silent.

– Powerful Ac motor: The compact and small-sized AC motors feature output 3/4 HP, steel frame and single phase.
– High Efficiency: The electric motor can run at the maximum speed 2800 RPM, high working efficiency. 220V/50Hz input volts, 3/4″ (19mm) shaft diameter, 1.57″ (40mm) shaft length. The upper hardness shaft is more durable.
– Steel Frame: The compressor duty motor is made of high quality steel material. The firm and CHINAMFG material can protect the engine well. Class F insulation.
– Super Quiet: Quiet series design at only 70 dB noise level for operator. Very ideal for the home workbench and outdoor use.
– High Speed Cooling Fan: Big fan at 1 end cools the motor in hours’ running, even in dusty or damp environments, reducing energy costs or overheads, increasing winding lifetimes.

– Heavy-duty oversized ball bearings. High tensile strength steel shaft. Large all-metal capacitor cover and large easy-to-wire junction box.


Technical Data

Type Power
Efficiency Power Factor

Noise Level


Overall  Dimension 


ML80S-2 0.55 2800 3.88 220/230 70% 0.92 70 1.8 11.6×6.3×7.87

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Application: Machine Tool
Speed: 2800 Rpm
Number of Stator: Single-Phase
Casing Protection: Closed Type
Number of Poles: 2
Starting Mode: Capacitor
US$ 31.99/PC
1 PC(Min.Order)




3 phase motor

How does a 3-phase motor ensure efficient and reliable operation?

A 3-phase motor is designed to ensure efficient and reliable operation through various mechanisms and features. Here’s a detailed explanation of how a 3-phase motor achieves efficient and reliable performance:

  • Rotating Magnetic Field: One of the key factors that contribute to the efficiency and reliability of a 3-phase motor is the creation of a rotating magnetic field. The three sets of stator windings, spaced 120 degrees apart, are energized by the three-phase power supply. This arrangement generates a rotating magnetic field within the motor. The rotating magnetic field interacts with the rotor, inducing currents that create torque and drive the rotation of the motor. The creation of a rotating magnetic field allows for smooth and efficient operation, minimizing vibrations and maximizing power output.
  • Higher Power Output: Compared to single-phase motors, 3-phase motors are capable of delivering higher power output. The balanced three-phase power supply and the design of the motor allow for efficient power transmission and higher torque production. This higher power output makes 3-phase motors suitable for applications that require greater horsepower and torque, such as industrial machinery, pumps, and compressors.
  • Efficiency: 3-phase motors are known for their high efficiency. The balanced three-phase power supply and the design of the motor contribute to reduced power losses and improved efficiency. The rotating magnetic field generated by the stator windings ensures smooth operation and minimizes energy wastage. As a result, 3-phase motors convert a higher percentage of electrical energy into mechanical energy, leading to energy savings and cost efficiency in the long run.
  • Reliable Starting Mechanism: 3-phase motors have a reliable starting mechanism that allows them to start on their own. With a simple direct-on-line (DOL) starting method, the motor can be connected directly to the power supply without the need for additional starting mechanisms. This ensures reliable and prompt motor startup, eliminating the need for manual intervention or complex starting circuits.
  • High Starting Torque: 3-phase motors typically exhibit high starting torque, which is crucial for overcoming the inertia and initial resistance of the connected load. The balanced three-phase power supply and the design of the motor enable the creation of a strong rotating magnetic field during startup. This results in a higher starting torque compared to single-phase motors, ensuring efficient and reliable motor operation even under heavy load conditions.
  • Durable Construction: 3-phase motors are constructed with durability in mind. The stator and rotor cores are made of laminated iron to minimize eddy current losses and improve magnetic performance. The windings are typically coated with insulating materials to protect them from environmental factors and ensure proper insulation. The motor housing or frame is designed to provide protection and support to the internal components. These design features contribute to the reliability and longevity of 3-phase motors in various operating conditions.
  • Thermal Protection: Many 3-phase motors incorporate thermal protection mechanisms to prevent overheating. These mechanisms may include thermal overload relays, temperature sensors, or embedded thermal switches. If the motor temperature exceeds a safe threshold, the thermal protection system activates and interrupts the power supply to prevent damage to the motor. This ensures reliable operation by preventing motor failure due to excessive heat.
  • Proper Maintenance and Lubrication: Regular maintenance and proper lubrication are essential for ensuring the efficient and reliable operation of 3-phase motors. Periodic inspections, cleaning, and lubrication of bearings, as well as checking the electrical connections and insulation, help maintain optimal motor performance and prevent premature failures. Following manufacturer guidelines and adhering to recommended maintenance practices contribute to the longevity and reliability of the motor.

These factors collectively contribute to the efficient and reliable operation of 3-phase motors. Their ability to deliver higher power output, high starting torque, and energy efficiency, combined with durable construction and proper maintenance, make 3-phase motors a preferred choice for a wide range of industrial, commercial, and residential applications.

3 phase motor

What maintenance practices are essential for prolonging the lifespan of a 3-phase motor?

Proper maintenance is crucial for prolonging the lifespan and ensuring the reliable performance of a 3-phase motor. Here are some essential maintenance practices that should be followed:

  • Regular Cleaning: Keep the motor and its surrounding area clean and free from dust, dirt, and debris. Regularly inspect and clean the motor’s exterior, ventilation openings, and cooling fins. This helps prevent the accumulation of contaminants that can interfere with the motor’s cooling and ventilation, leading to overheating and reduced efficiency.
  • Lubrication: Follow the manufacturer’s recommendations for lubrication intervals and use the specified lubricants. Proper lubrication of bearings, gears, and other moving parts reduces friction, minimizes wear and tear, and ensures smooth operation. Inspect and replenish lubricants as needed, taking care not to over-lubricate, which can cause excessive heat buildup.
  • Vibration Analysis: Monitor motor vibrations regularly using vibration analysis techniques. Excessive vibration can indicate misalignment, worn bearings, or other mechanical issues. By detecting and addressing vibration problems early on, potential failures can be prevented, and the motor’s lifespan can be prolonged.
  • Electrical Inspections: Periodically inspect the motor’s electrical connections, terminals, and wiring for signs of wear, loose connections, or overheating. Tighten any loose connections and address any abnormalities promptly. Electrical inspections help prevent electrical failures and ensure safe and efficient motor operation.
  • Temperature Monitoring: Monitor the motor’s operating temperature using temperature sensors or thermal imaging. Abnormally high temperatures can indicate issues such as overload, insufficient cooling, or bearing problems. Regular temperature monitoring allows for timely identification of potential problems and the implementation of corrective measures.
  • Alignment and Balancing: Ensure the motor is properly aligned with the driven equipment, such as pumps or fans. Misalignment can cause excessive stress on the motor shaft and bearings, leading to premature failure. Additionally, balance any rotating components, such as fan blades or impellers, to reduce vibrations and strain on the motor.
  • Inspect and Replace Worn Parts: Regularly inspect the motor’s components, such as belts, pulleys, brushes, and capacitors, for signs of wear, damage, or deterioration. Replace any worn or damaged parts promptly to prevent further damage to the motor and ensure optimal performance.
  • Preventive Maintenance Schedule: Establish a preventive maintenance schedule based on the manufacturer’s recommendations and the motor’s operating conditions. This schedule should include routine inspections, lubrication, cleaning, and testing. Adhering to a regular maintenance routine helps identify potential issues early on and allows for timely repair or replacement, thus extending the motor’s lifespan.
  • Training and Documentation: Ensure that maintenance personnel are properly trained in motor maintenance procedures and safety protocols. Maintain detailed documentation of maintenance activities, including dates, observations, and performed tasks. This documentation provides a historical record of maintenance activities and facilitates troubleshooting and future maintenance efforts.
  • Environmental Considerations: Protect the motor from harsh environmental conditions, such as excessive heat, humidity, dust, or corrosive substances. If the motor is exposed to such conditions, consider implementing protective measures, such as enclosures, ventilation systems, or sealing, to safeguard the motor and prolong its lifespan.

By implementing these maintenance practices, motor owners can maximize the lifespan, reliability, and performance of their 3-phase motors. Regular inspections, cleaning, lubrication, and addressing any identified issues promptly are key to ensuring optimal motor operation and minimizing the risk of unexpected failures.

3 phase motor

Can 3-phase motors be customized for specific torque and speed requirements?

Yes, 3-phase motors can be customized to meet specific torque and speed requirements. Here’s a detailed explanation of their customization capabilities:

  • Motor Design:
    • 3-phase motors can be designed and manufactured to meet specific torque and speed requirements. Motor manufacturers can customize the motor’s physical characteristics, such as the number of poles, winding configuration, and core materials, to optimize its performance for the desired torque and speed range.
    • The motor’s design parameters, such as the diameter and length of the stator and rotor, can be adjusted to achieve the desired torque output. Similarly, the number of windings and their arrangement can be tailored to provide the necessary speed characteristics.
  • Winding Configurations:
    • The winding configuration of a 3-phase motor significantly influences its torque and speed characteristics. By customizing the winding arrangement and connections, motor manufacturers can achieve specific torque and speed requirements.
    • For example, a motor with a delta (Δ) winding configuration tends to provide higher starting torque, making it suitable for applications that require high initial torque. On the other hand, a motor with a star (Y) winding configuration may offer better speed regulation and efficiency.
  • Motor Control:
    • 3-phase motors can be controlled and adjusted using various control devices and techniques to achieve specific torque and speed requirements. Control methods include voltage control, frequency control, and pulse width modulation (PWM) control.
    • By using control devices such as variable frequency drives (VFDs) or adjustable speed drives (ASDs), the frequency and voltage supplied to the motor can be adjusted in real-time, allowing precise control over motor speed and torque output.
  • Mechanical Modifications:
    • In some cases, mechanical modifications can be made to 3-phase motors to customize their torque and speed characteristics. For example, the addition of gearboxes or speed reducers can allow a motor to generate higher torque at lower speeds, or vice versa.
    • By incorporating mechanical modifications, manufacturers can fine-tune the motor’s performance to match specific application requirements, achieving the desired torque and speed range.

Overall, 3-phase motors can be customized to meet specific torque and speed requirements through motor design, winding configurations, motor control techniques, and mechanical modifications. Motor manufacturers can tailor these aspects to optimize the motor’s performance for a wide range of industrial applications, providing the necessary torque and speed characteristics needed for specific requirements.

China OEM 3/4HP Electric Motor 550W, 2800rpm Air Compressor Single Phase AC Motor   with Best Sales China OEM 3/4HP Electric Motor 550W, 2800rpm Air Compressor Single Phase AC Motor   with Best Sales
editor by CX 2024-04-12