4" three-phase oil-cooled motor

Electric motors from series OT are 2 pole asynchronous three-phase submersible motors designed to operate coupled to hydraulic parts with 4” Nema standard. Strong and reliable, they are made of materials suitable for contact with water and oil-cooled by FDA - Food Drug Administration approved dielectric fluid. OT motors require a start, operation and protection system.
Supply cable connector is removable for quick and easy maintenance.
OT oil-cooled motors ensure reliable working in 4” or larger diameter wells and are designed to be used for lifting, distribution, and pressurisation of water in water systems. OT motors are equipped with phase separator which ensures optimal operation when the motor is used with frequency inverter.
  • 2 pole asynchronous three-phase oil-cooled motor.
  • Rewindable stator and rotor immersed in dielectric fluid (FDA approved).
  • Oversized axial and radial oil-lubricated bearings to guarantee longer life to the motor.
  • The pressure compensation inside the motor is ensured by a special internal diaphragm.
  • Sand protection to guarantee optimal operation even with sand in the borehole.
  • Motor bottom cover for extra protection and safety.
  • Removable lead connector to make installation and maintenance easier.
  • Supply cable according to drinking water regulations (ACS), available in different lenghts.

Send us a request

  • kW: 0,37 - 5,5
  • Voltage range: 380-415V / 50Hz
  • Flange: 4" NEMA standard dimensions
  • Voltage tolerance 50Hz from nominal: +6% / -10% Un
  • Rotation: reversible
  • Degree of protection: IP 68
  • Insulation: F
  • Rated ambient temperature:  max 40° C
  • Cooling flow: min 8 cm/sec
  • Maximum starts/h: 150, equally distributed
  • Mounting: vertical/horizontal, shaft upwards
  • Maximum immersion depth: 150 m
  • Allowed range of water pH: 6,4 - 8,0
  • Thrust: 1.500 N, 2.500 N, 4.500 N (according to ranges)
  • Protection requirements: For OT motors overload protection and a control unit for motor start and run must be installed according to EN 60947-4-1 trip time < 10 sec. at 5xIn.

Information on a proper installation

  • Before installation, it is necessary to verify technical requirements of the given hydraulic part (thrust, power) to select the correct motor.
  • If you are using a generator with an internal combustion engine, it is necessary that the generator’s power measured in kW (in continuous delivery) is three times the rated power in kW of the submersible pump.
  • We recommend to install a proper cooling jacket in installations bigger than 10 cm, to guarantee the correct motor cooling flow.
  • The maximum quantity of sand allowed in the pumped water is 120 g/m³.




Download our catalogue

To download the version with prices please login or register.