HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
This paper develops a bimetallic thermal protector synergistic protection solution for the extreme overheating problem of vehicle motors. By analyzing the load difference between window and sunroof motors, a wide temperature range adaptive protector is designed, which can realize 8-15A overload current in 12V/24V system ≤ 10 seconds of rapid disconnection, and provide high efficiency and low-cost overheating protection for on-board motors.
I. Core working mechanism
The bimetal thermal protector realizes overload protection through thermal-mechanical coupling effect, and its core is compounded by two metal layers (such as nickel-chrome alloy + copper alloy) with different coefficients of thermal expansion.
Current Abnormality Detection: When the motor current rises due to blocking or overload, the current flowing through the protector heats up the bimetal.
Deformation trigger protection: the bimetal is bent by heat, pushing the mechanical contacts to separate and cut off the power supply circuit (response time 4-10 seconds).
Automatic reset: the bimetal restores its original shape after the temperature drops, and the contact re-conducts without manual intervention.
II. Specialized protection for window lift motor
1. Blocking protection
When the window is raised or lowered to the limit position, the motor's continuous blocking current can be up to 3 times of the rated value. The bimetal plate cuts off the circuit quickly according to the preset threshold (e.g. 8A) to avoid the temperature rise of the winding exceeding 130℃.
2. Temperature rise control
Mounted directly on the motor winding, real-time monitoring of temperature changes. Protection is triggered when the ambient temperature is >80°C or when there are 15 consecutive rises and falls, reducing the risk of burnout.
I. Core working mechanism
The bimetal thermal protector realizes overload protection through thermal-mechanical coupling effect, and its core is compounded by two metal layers (such as nickel-chrome alloy + copper alloy) with different coefficients of thermal expansion.
Current Abnormality Detection: When the motor current rises due to blocking or overload, the current flowing through the protector heats up the bimetal.
Deformation trigger protection: the bimetal is bent by heat, pushing the mechanical contacts to separate and cut off the power supply circuit (response time 4-10 seconds).
Automatic reset: the bimetal restores its original shape after the temperature drops, and the contact re-conducts without manual intervention.
II. Specialized protection for window lift motor
1. Blocking protection
When the window is raised or lowered to the limit position, the motor's continuous blocking current can be up to 3 times of the rated value. The bimetal plate cuts off the circuit quickly according to the preset threshold (e.g. 8A) to avoid the temperature rise of the winding exceeding 130℃. 2.
2. Temperature rise control
Mounted directly on the motor winding, real-time monitoring of temperature changes. Protection is triggered when the ambient temperature is >80°C or when there are 15 consecutive rises and falls, reducing the risk of burnout.
C. Adaptive design of sunroof motor
1. Anti-vibration interference
Adopt spring pre-pressure contact structure to avoid false operation caused by vehicle bumps (stable operation when the vibration frequency is ≤200Hz).
2. Anti-foreign object jamming protection
When the guide rail sand and dust intrusion or mechanical deformation, the motor load suddenly increases. The bimetal responds within 5 seconds when the current is >12A, preventing the gearbox from overheating and damage.
Through the precise matching of the physical thermal mechanism with the motor's operating conditions, the bimetal thermal protector becomes the optimal solution for overheating protection of on-board motors with low cost and high reliability.
Translated with DeepL.com (free version)
1. Anti-vibration interference
Adopt spring pre-pressure contact structure to avoid false operation caused by vehicle bumps (stable operation when the vibration frequency is ≤200Hz).
2. Anti-foreign object jamming protection
When the guide rail sand and dust intrusion or mechanical deformation, the motor load suddenly increases. The bimetal responds within 5 seconds when the current is >12A, preventing the gearbox from overheating and damage.
Through the precise matching of the physical thermal mechanism with the motor's operating conditions, the bimetal motor thermal protector becomes the optimal solution for overheating protection of on-board motors with low cost and high reliability.
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