Electric Water Pump (EWP)
Electric coolant pumps for precise and efficient coolant circulation in electric and hybrid vehicles
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.
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.
| Model | | | | |
| 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 |
- 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.
How does the electric water pump maintain reliable operation under high-temperature conditions?
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.