Slewing and lifting equipment motors

Exemplary design

Brief description

Depending on the application, the motors are designed as AC squirrel-cage rotor motors with excellent operating characteristics and high dynamics for operation on frequency converters, pole-changing motors or AC slip ring motors.

Application

In the meantime, the AC slip ring motors are primarily demanded if replacement motors are required for existing installations. For many years, AKH motors have been used in crane and hoisting installations.

Specifications

  • Shaft height: 112 to 450 mm
  • Power: up to 350 kW
  • Speed range: up to 3.000 U/min
  • Duty cycle: S1
  • Cooling: IC 411 (self-ventilated)
  • Voltage: 400 V / 50 Hz
  • Insulation class: F
  • Mounting: IM B3 / B5
  • Degree of protection: IP 54
  • Vibration severity grade: A
  • Ambient temperature: 20 to 40 °C
  • Installation altitude: up to 1.000 m

Details of standard design

  • AC motors with squirrel cage rotor
  • Optimized dimensioning for frequency converter operation
  • Shaft end made from C-45
  • Balancing with half key
  • Steel- or cast housing, bearing shields made from cast iron
  • Lifetime lubricated rolling bearings
  • Primer RAL 7031

Options of electrical design

  • AC motors with slip ring rotor
  • Rated power for short term operation (S3)
  • Efficiency classes IE 2, IE 3, (IE 4)
  • With external fan
  • Dimensioning as 2, 4, 6, 8, 10, 12, 24 or 36-pole motors (167 to 3000 rpm at a 50 Hz-mains)
  • Pole-changing motors (Dahlander) 4/2, 8/4, 12/6 –pole
  • Pole-changing motors (separate winding) 4/2 to 36/2, 6/4 to 36/4, 12/4/2 to 36/4/2
  • Special voltages and -frequencies
  • Insulation class H
  • Higher ambient temperature and installation altitude over 1.000 m
  • Winding temperature monitoring by thermo switch, PTC resistor or Pt100
  • Anti-condensation heating

Options of mechanical design

  • Other mountings acc. to IEC 60034-7
  • Frameless design
  • Flange and shaft design for gearbox attachment
  • Manual or automatic regreasing device
  • Special bearings for high radial and axial loads
  • Protection class IP 23 to IP 55
  • Vibration severity grade: B
  • Humidity- and tropic proofing
  • Housing, bearing shields and terminal box made from ductile cast iron or steel
  • Different lacquer qualities , RAL- color at customers option
  • Replacement of motors from other manufacturers
  • Design to company standards

Options of built-on components

  • Eddy-current brake
  • Holding brake with wind-release system
  • Gear box
  • Optical or magnetic speed sensors

Options of certificates, special approvals, e.g

  • GOST
  • Germanischer Lloyd
  • Diverse works Standards
  • etc.

Example: motor 3DF225MG-04/FW

  • Voltage: 400 V / 50 Hz, 480 V / 60 Hz
  • Rotor-voltage: 335 V, 400 V
  • Power: 66 kW / 79 kW S3-40 % (intermittent operation)
  • Speed: 1.450 rpm / 1.740 rpm
  • Shaft height: 225 mm

Application-specific technical details

  • Slip ring rotor with radial mounted fan
  • Dimensioning with increased power for intermittent operation S3, switch-on duration 40 %
  • Eddy-current brake
  • Mounting IM B5
  • Special end shield
  • Manual regreasing device