Automotive Thermal Management Systems Manufacturer

Electric Water Pump (EWP)

Electric coolant pumps for precise and efficient coolant circulation in electric and hybrid vehicles

Electric Water Pump (EWP)

Saiensi is dedicated to the development and manufacturing of advanced thermal safety management products. Backed by a CNAS-accredited laboratory and an 80% in-house production rate, the company ensures precise control over material quality, cost efficiency, delivery timelines, and product performance.
Saiensi’s electric water pumps are driven by reliable motors and precisely regulated by an electronic control unit (ECU) to manage speed and ensure continuous coolant circulation for the thermal management of engines, batteries, and other vehicle systems.

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Applications

Electric water pumps are key components in the cooling systems of new energy commercial vehicles. Their installation position and configuration may vary depending on vehicle type, powertrain design, and specific application requirements.

Applications
Applications
Applications
Technical Specifications
Model N5202-250W24 N5201-250W24 N5201-300W24 N5202-300W24
Test Voltage 24V 24V 24V 24V
Voltage Range 18V-32V 18V-32V 18V-32V 18V-32V
Max Load Current 10A±5% 10A±5% 12.5A±5% 12.5A±5%
Max Power 250W 250W 300W 300W
Max Head ≧14M ≧6M ≧8M ≧14M
Max Flow Rate ≧2200L/h ≧6000/h ≧4000/h ≧2800/h
Control Mode PWM (50-500HZ) PWM (50-500HZ) PWM (50-500HZ) PWM (50-500HZ)
Static Current 50uA 50uA 50uA 50uA
Protection Level IP67 IP67 IP67 IP67
Key Features
  • Efficient drive: Utilizes a brushless DC motor with electronic commutation replacing traditional carbon brushes, reducing friction losses and improving efficiency by 20–30%.
  • Smart speed control: Supports PWM, 0–5V analog signal, or potentiometer control. The pump dynamically adjusts flow and head according to cooling demand to avoid energy waste. For example, in new energy vehicles, the pump communicates via CAN bus for precise temperature regulation.
  • Wear-free design: Brushless structure eliminates mechanical wear, extending service life to 20,000–30,000 hours — 30–40 times longer than brushed motors. Ceramic shafts and carbon–graphite bushings further reduce wear, maintaining failure rates below 0.5%.
  • Harsh-environment adaptability: Wide operating temperature range (-40°C to 120°C) with IP67 protection. Resistant to acidic and alkaline solutions, suitable for EV battery cooling and industrial circulation.
  • Leak-proof construction: Epoxy resin encapsulation ensures complete electric isolation.
  • Material innovation: Made from PA66+30%GF (glass fiber reinforced nylon), offering high strength, heat resistance, and lightweight durability.
  • Advanced control technology: Integrated FOC (Field-Oriented Control) algorithm ensures smooth torque output and low-noise (< 40dB) operation.
  • Comprehensive protection: Includes stall protection, reverse polarity protection, and overtemperature protection. Some models feature automatic dry-run shutdown for enhanced system safety.
Main Components
Housing Housing
Motor Motor
Rotor Rotor
Products
Manufacturing Base
Rubber Sealing & Vibration Isolation Products
Rubber Sealing & Vibration Isolation Products
Gas Springs
Gas Springs
Fuel Pumps (Engine Components)
Fuel Pumps (Engine Components)

EWP is designed to perform in harsh environments with a wide operating temperature range (-40°C to 120°C) and IP67 waterproof protection. The brushless structure eliminates mechanical wear, achieving a service life of 20,000–30,000 hours and a failure rate below 0.5%. It also resists acidic and alkaline solutions, making it suitable for EV battery cooling and industrial circulation.