Technical Specification

📊 TECHNICAL SPECIFICATION

🔌 Electrical

• Motor type: 3-phase electronically commutated DC motor
• Supply voltage:
  • Motor drive supply: ~50 V DC (from radar PSU)
  • Typical motor rating (variant): 24–30 V DC
• Control: Motor Drive PCB with:
  • Speed selection (high/low)
  • Dynamic braking
  • Current protection

⚙️ Mechanical / Gearbox

• Gearbox type: Integral reduction gearbox
• Primary gear ratio: ~32:1
• Secondary belt reduction: ~3:1
• Total reduction ratio: ~96:1 (motor → antenna)

👉 Purpose: Converts high-speed motor rotation into slow, high-torque antenna rotation

🔄 Performance

• Antenna rotation speed:
  • Standard: ~28 RPM
  • High speed: ~45 RPM
• Speed control: Selectable (manual or remote link setting)
• Wind compensation: Hall sensors adjust speed under load

🧠 Control & Protection

• Hall sensor feedback for commutation & speed stability
• Dynamic brake system prevents free spinning (windmilling)
• Overload protection via current limiting circuit
• Safe maintenance switch to stop antenna rotation

🌡️ Environmental

• Operating temperature: down to –40°C
• Marine standard: IEC 60945 compliant
• Designed for:
  • High humidity
  • Salt atmosphere
  • Vibration / shock