Open Air Resistor Metal Element Current Sense

Through Hole Open Air Low ohm wire Resistor for Motor Controllers are specialized resistors designed for high current applications, particularly in current sensing. These resistors feature a metal element as the resistive component, which is welded to copper leads. They are typically mounted through-hole on a printed circuit board (PCB) and are often used in open-air configurations to enhance heat dissipation and reliability.

This high-performance wirewound resistor is specifically designed for motor controllers, utilizing Manganin or Nichrome alloy resistance wire combined with open-air non-inductive winding technology. It achieves ultra-low resistance values (0.01Ω~10Ω) and exceptional current-carrying capacity. Leveraging the stable temperature coefficient and high-temperature resistance of metal alloys, it ensures precision in current sampling, dynamic braking, and overcurrent protection for motor drive systems under harsh operating conditions. Ideal for electric vehicles, industrial servo systems, automation equipment, and more.

Key Features:

1. Alloy Wire for Precision Current Control

   • Manganin (Low TCR): Temperature coefficient as low as ±20ppm/°C, minimal resistance drift with temperature, ensuring stable current sampling.

   • Nichrome Alloy (High-Temperature Resistance): Withstands temperatures up to +400°C, oxidation-resistant, and corrosion-resistant, suitable for high-power motor controllers.

2. Open-Air High Heat Dissipation Design

   • Unsealed structure paired with high thermal conductivity of metal alloys improves heat dissipation efficiency by 30%, supporting 15A~80A continuous current and 200A instantaneous peak current.

3. Ultra-Low Resistance Precision Winding

   • Resistance range: 0.01Ω~10Ω (accuracy ±1%), non-inductive winding minimizes parasitic inductance interference in high-frequency motor control.

4. Industrial Vibration Resistance

   • Metal alloy frame + ceramic insulating bushings, vibration resistance up to 10G@10-2000Hz, dust and moisture protection (standard IP00, customizable to IP20).

     Technical Specifications:

     • Resistance Range: 0.01Ω–10Ω

     • Rated Power: 10W–100W (natural cooling)

     • Temperature Coefficient (TCR): Manganin ±20ppm/°C, Nichrome ±50ppm/°C

     • Withstand Voltage: 1000V AC (between alloy wire and frame)

     • Operating Temperature: -65°C to +400°C (Nichrome models)

     • Materials: Manganin/Nichrome resistance wire + aluminum alloy frame + ceramic insulating rings

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