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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
Wiper motors are prone to damage due to overload in scenarios such as ice and snow jams, voltage fluctuations, etc., even causing safety hazards. The bimetallic overload protector becomes the core component to ensure the safe operation of the wiper motor through quick current cut-off and self-recovery function.
Principle and Core Advantages
Principle of operation: Composite of two metal sheets with different coefficients of thermal expansion. When overloaded, the current heats up so that the metal sheet bends to break the circuit, and then resets itself automatically when it cools down.
Core Advantages:
Fast Response: Directly senses temperature changes, faster than electronic sensors.
Compact structure: small size (12.5*8*3.6mm), without external circuitry, suitable for small space in the car.
Long-lasting and durable: supports tens of thousands of starts and stops, with a life span that matches the motor.
Typical overload scenarios for wiper motors
Sudden increase in mechanical resistance: wiper arm frozen by ice or snow or drive mechanism jammed.
Electrical abnormalities: battery voltage fluctuation or inrush current shock.
Extreme environment: Insufficient heat dissipation at high temperature or lubrication failure at low temperature.
If there is no protection, it may lead to motor burnout, short circuit or even fire.
Application Design Key Points
Parameter Matching: Action temperature is set at 60℃~180℃, suitable for 1-30A motor current.
Installation Optimization: Close to the motor winding to enhance sensitivity, anti-vibration design to avoid false triggering.
Environmental protection: sealed package to prevent moisture and corrosion, passes -40℃~200℃ wide temperature test.
HC02 bimetallic overload protector has become the mainstream solution for wiper motor overload protection with the advantages of high reliability and low cost. In the future, it may be combined with intelligent diagnosis and new material technology to further adapt to the high power demand of new energy vehicles.
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