Pump -, fan-, agitator motors

Exemplary design

Brief description

The motors are designed as AC motors with squirrel-cage rotor. The M=f(n) characteristic is quadratic to the specific application. Due to the use of special qualities of material and optimized electrical and mechanical design, we attain a very high degree of efficiency with the motors.

Application

The forced- and self-ventilated motors are, et al. used as pump motors in vertical multi-stage process pumps. This application is characterized by a quadratic load characteristic curve, high mechanical and thermal requirements on the bearing, high motor speed and rough conditions of use.

Specifications

  • Shaft height: 112 to 400 mm
  • Power: up to 450 kW
  • Speed range: up to 6.000 rpm
  • Duty cycle: S1
  • Efficiency classes: IE 2 / IE 3
  • 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

  • frequency converter operation
  • Shaft end made from C-45
  • Balancing with half key
  • Bearing shields and housing made from cast iron
  • Spindle bearings for high radial and axial forces
  • Primer RAL 7031

Options of electrical design

  • Increased rated power for short term operation or intermittent operation
  • Efficiency classes IE 4
  • With external fan
  • Special voltages and -frequencies
  • Dimensioning as 2, 4 or 6 or 8- pole motors
  • 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
  • Special-shield-material for aggressive fluids
  • very long shafts for agitators
  • Electrically insulated bearings
  • Manuel or automatic regreasing device
  • Vibration severity grade: B
  • Humidity- and tropic proofing
  • Different lacquer qualities , RAL- color at customers option

Options of built-on components

  • Brake
  • gear box
  • Optical or magnetic speed sensors
  • Backstop

Options of certificates, special approvals, e.g.

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

Example: motor 2EF355XG-02/D

  • Voltage: 380 V / 62,8 Hz
  • Power: 309 kW S1 (continuous operation)
  • Speed range: 3.755 rpm
  • Shaft height: 355 mm
  • Frequency converter operation

Application-specific technical details

  • Dimensioned for special voltages
  • Insulation class F
  • Dimensioned for max. bearing temperature rise of 60 K at 40 °C ambient temperature
  • Installation V1, including rain cover
  • Dimensioned for installation 1.315 m above sea level
  • Degree of protection IP 55
  • Manual regreasing device