Which parts of the integrated module for thermal management in automobiles use injection molded ferrite
The application primarily focuses on magnetic drive components, sensors, and heat exchange control units. Its high precision, corrosion resistance, and integrated molding characteristics make it a critical material.
1. Electronic Water Pump Rotor Magnet
Function: Drives coolant circulation to regulate temperatures of batteries, motors, and electronic control systems.
Technical Features:
· Integrated Molding: The ferrite magnet, impeller, and bearing are injection-molded as a single unit, reducing part count (e.g., traditional split designs require 5 parts → 1 after molding), lowering leakage risks.
· Low-Noise Design: Dynamic balance accuracy meets G6.3 standard, runout <0.05 mm, noise level <35 dB(A), suitable for NVH-sensitive zones (e.g., cabin cooling systems).
· High-Temperature Resistance: With added fillers (e.g., zirconia), temperature resistance increases to 150°C, meeting battery heat pump system requirements.
2. Solenoid Valve Core
Function: Controls coolant flow direction (e.g., battery cold plates, PTC heater circuits).
Technical Features:
· High Response Speed: The coercivity (Hcj) of the injection-molded ferrite core reaches ≥2000 kA/m, ensuring stable valve operation with fast switching between -30°C and 120°C (response time <50 ms).
· Compact Design: Utilizing multi-pole magnetization (e.g., 8-pole/12-pole), achieves 0.5 T magnetic flux density within a Φ15 mm inner diameter, replacing traditional sintered magnets.
3. Temperature Sensor Magnetic Assembly
Function: Cooperates with Hall elements to detect coolant flow rate/temperature.
Technical Features:
· High Sensitivity: The ferrite magnetic ring (e.g., SMC-20H) has a permeability (μ) of 2000±30%, enabling detection of flow rate changes as low as 0.1 L/min.
· EMI Resistance: Injection-molded encapsulation shields against electromagnetic interference, suitable for high-magnetic-field environments (e.g., motor cooling circuits).
