Model: 70M300 - General Introduction
This model, 70M300, typically refers to a submersible pump motor from a major manufacturer's series (e.g., a common designation in industries). It is a robust, three-phase, squirrel-cage induction motor specifically engineered for direct immersion in the fluid being pumped. It is designed to be coupled directly to a submersible pump bowl assembly, forming the core drive unit for deep-well water extraction, industrial dewatering, and irrigation applications. Key characteristics include a waterproof stator, corrosion-resistant construction, and efficient cooling via the surrounding fluid.
Detailed Parameters (Example Specifications)
| Parameter Category | Specification (Example) | Details / Notes |
|---|---|---|
| Motor Type | Three-Phase, Submersible, Induction Motor | Designed for continuous operation while fully submerged. |
| Output Power | 75 kW (Approx. 100 HP) | The numeric "300" in the model often correlates to a power rating (e.g., in this example, ~100 HP). Actual range for this series could span from 50kW to over 150kW. |
| Voltage & Frequency | 380-415V, 50 Hz or 460V, 60 Hz | Common industrial voltage standards. Specific winding depends on order code. |
| Speed (Synchronous) | 3000 RPM (2-pole) or 1500 RPM (4-pole) | Most common for pump applications is 4-pole (1500 RPM). |
| Efficiency Class | IE3 (Premium Efficiency) or higher | Meets or exceeds international energy efficiency standards. |
| Insulation Class | Class F (155°C) or Class H (180°C) | Standard for submersible motors, with a temperature rise typically limited to Class B (80°C) under rated load. |
| Protection Class | IP68 | Guarantees watertight integrity and continuous submersion at specified depths. |
| Max. Operating Depth | Up to 1000 meters below discharge level | Dependent on cable and motor housing pressure rating. |
| Cable Entry | Integral, potted cable termination | Features a sealed connection to a waterproof submersible drop cable. |
| Housing Material | Stainless Steel (e.g., AISI 304/316) or Corrosion-Resistant Alloy | For protection against aggressive water (borehole, saline, wastewater). |
| Shaft Material | Stainless Steel, high-strength | Resists corrosion and fatigue. |
| Dimensions (Approx.) | Diameter: 8" to 10" (200mm - 250mm) Length: 1200mm - 1800mm | Varies significantly with power rating and number of stages. Diameter is often standardized by NEMA or ISO well casing sizes. |
| Weight (Approx.) | 250 kg - 500 kg | Heavily dependent on power, materials, and overall length. |
| Cooling | Water-cooled by surrounding medium. | The motor is cooled by the fluid flowing past its outer shell. |
| Lubrication | Oil-filled or water-lubricated bearings. | Common designs use a clean dielectric oil bath for bearings and internal cooling. |
Primary Application Scenarios
This motor is the power source for vertical multistage centrifugal pumps in demanding submersion environments.
Deep-Well Water Supply & Irrigation:
Municipal and Agricultural Wells: The primary application is extracting potable or irrigation water from deep boreholes. The motor and pump assembly are suspended in the well, pushing water to the surface.
Industrial Process Water & Dewatering:
Mine Dewatering: Used in coal, mineral, and salt mines to control groundwater levels and ensure a dry working environment.
Quarry & Construction Site Dewatering: Removes groundwater from excavations and foundations.
Pressure Boosting & Water Transfer:
Booster Stations: Installed in pressurized water supply networks or closed tanks to increase system pressure for distribution or industrial processes.
Geothermal Energy Extraction:
Used in geothermal wells to circulate the heat transfer fluid (water or brine) from deep underground to the surface for energy conversion.
Water/Wastewater Treatment Plants:
Raw Water Intake & Effluent Discharge: For lifting untreated water into the plant or discharging treated effluent back into rivers or the sea from submerged outfalls.
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