18.5KW 6-Pole Three-Phase Induction Motor Introduction

This 18.5KW heavy-duty three-phase induction motor is a high-performance industrial drive core, featuring a 6-pole configuration and a rated speed of 900 RPM—closely approximating the 1000 RPM synchronous speed under 50Hz three-phase alternating current (AC) power supply. Its core operational mechanism relies on the principle of electromagnetic induction: when three-phase AC is supplied to the stator windings, a uniform rotating magnetic field (RMF) is generated, with rotational speed determined by power frequency and pole pair count. The RMF cuts the rotor conductors, inducing electromotive force (EMF) and eddy currents, and the interaction between these induced currents and the RMF produces strong electromagnetic torque, driving the rotor to rotate asynchronously with a low slip ratio (3%-5% at rated load), ensuring stable power transmission for heavy-load, medium-low speed equipment.

Structurally engineered for heavy-duty durability, the motor adopts a robust cast-iron frame with IP55 protection class, providing superior dustproof, waterproof, and anti-corrosion performance to withstand harsh industrial environments such as high-dust workshops, high-humidity plants, and outdoor operation sites. The stator is equipped with high-purity oxygen-free copper windings encapsulated in Class F insulation material, boasting a thermal endurance temperature of 155℃, which minimizes copper loss, enhances heat dissipation efficiency, and effectively prevents insulation breakdown due to long-term high-load operation. The 6-pole rotor features a die-cast aluminum squirrel-cage structure with precision dynamic balancing, ensuring high mechanical strength, low rotational inertia, and minimal vibration, paired with large-diameter sealed deep-groove ball bearings lubricated by high-temperature lithium-based grease to reduce frictional loss and extend service life.

Key performance parameters are calibrated for heavy-duty, medium-low speed applicability: rated voltage 380V (50Hz), rated current approximately 37A, and a rated power factor of ≥0.87. It delivers a starting torque of 1.8 times the rated torque for reliable startup under heavy loads, with a maximum torque of 2.2 times the rated torque to cope with sudden load fluctuations. Compliant with IE3 high-efficiency standards, it significantly reduces energy consumption, with noise emission controlled at ≤80dB at 1m. Widely used in medium-low speed heavy machinery, industrial pumps, belt conveyors, and mixing equipment, it supports horizontal and vertical mounting modes. Regular maintenance, including insulation resistance testing (≥2MΩ at 500V DC), bearing lubrication replacement, and stator winding cleaning, ensures long-term stable operation, making it a cost-effective and reliable heavy-duty drive solution.