HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
Tubular motors are susceptible to damage due to overheating of the windings in overloaded, blocked or high temperature environments. This paper discusses how to build a set of concise and effective temperature protection program through thermal switch.
I. Necessity of temperature protection
Motor overheating is the main cause of insulation aging, core demagnetization and even short-circuit failure. Traditional protection relies on current detection, but cannot respond directly to temperature rise. Temperature control switch triggers power failure through physical temperature sensing, which can accurately block the heat accumulation chain and make up for the shortcomings of traditional programs.
II. Working Principle of HCET-A Thermal Switch
The core of temperature control switch is bimetal structure. Its principle is as follows:
Thermal deformation trigger: the difference in thermal expansion coefficients of different metal layers leads to the bending of the metal sheet.
Circuit on and off: under the preset temperature, deformation pushes the contacts to separate and cut off the power supply; reset and close after cooling down.
Threshold setting: customize the action temperature (e.g., 70°C, 90°C, etc.) by adjusting the metal sheet material and shape.
III. Implementation Program Design
1. Device Selection
Temperature threshold: Refer to the motor insulation class (e.g. Class B ≤ 130℃), set the protection point 10%~15% below the limit value.
Current capacity: The switch rated current needs to cover the motor peak current to avoid contact ablation.
2. Installation points
Positioning: Close to the weak area of heat dissipation of the motor housing (e.g. non-ventilated side) to ensure heat transfer efficiency.
Fixing: Adopt heat-conductive adhesive or metal clips to eliminate the delay of temperature measurement caused by the air gap on the contact surface.
3. Circuit integration
Basic program: the temperature control switch is connected in series to the motor power supply circuit, directly controlling the on-off.
Extension program: for high-power motors, add a relay module, the temperature control switch to control the relay coil, reducing the contact load.
Ⅳ.Application Value Analysis
Safety Improvement: Avoid fire risk and equipment damage caused by overheating.
Cost-effectiveness: A single temperature control switch costs less than US$1, which reduces more than 60% of maintenance expenses.
Compatibility advantage: no need to modify the motor body, suitable for newly installed equipment and stock system modification.
Conclusion
The HCET-A thermal switches provide reliable temperature protection for tubular motors with a simple physical mechanism. In the future, the combination of intelligent temperature control algorithms and IoT technology can further realize remote monitoring and predictive maintenance, and promote the development of motor systems in the direction of greater safety and efficiency.
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