Advantages (4" motors):

• Filling the engine with dielectric fluid, non-toxic, resistant to freezing
• Mechanical sealing of the motor shaft
• Shaft end according to international standard , connection according to NEMA

Advantages (6", 8" and 10" motors):

• The stator windings are made with winding wires in PVC thermoplastic insulation (SMS ) or PA-PE2 (SMP), increasing the life of the motor compared to the winding insulation made of PP.
• The motor shaft is bearing with radial plain bearings and one bearing to transmit axial forces, it is a modern segmented design, the so-called hard bearing, where the friction pair is made of carbonographite and steel.
• Stable and secure connection of the motor holder with the body to prevent it from breaking off in the well.
• The rotor shaft with the rotor tip is friction-welded and then machined, which eliminates the phenomenon of rotor tip snapping.
• In accordance with international standards, connection according to NEMA standard for 6" and 8" motors.
• SMP type motors have stator windings made of heat-resistant conductors ( PA-PE2) as standard.

Construction (4" Engines):

The deep-sea motor of type SMS.4. is an asynchronous, squirrel-cage motor. It is designed as a wet motor with stator winding made by winding wire in varnish insulation, filled with dielectric fluid, non-toxic, which mediates the heat dissipation of internal losses in the motor to the environment moreover, it lubricates the bearings rolling bearings of the motor, in which the motor shaft is housed. The fluid is a mineral oil that is resistant to freezing. A high-quality mechanical shaft seal prevents the pumped fluid from entering the engine. Changes in the volume of the fluid filling the engine under the influence of temperature are compensated by a bellows expansion vessel at the bottom of the motor. The motor's lower rolling bearing transfers the axial force from the mass of the motor-pump rotating system along with the the force from the hydraulic thrust from the pump. The motor shaft end including the connection is NEMA compliant

Construction (6", 8" and 10" motors):

The SMS or SMP submersible motor is a three-phase asynchronous, squirrel-cage motor. It is designed as a wet with the stator winding made with a winding wire in thermoplastic insulation, in a stainless steel housing stainless steel.The windings of these motors can be rewound.

The engine is filled with a mixture of propylene glycol and water in a ratio of 1 : 1, which provides resistance to freezing at temperatures down to -15oC. Propylene glycol is a hygroscopic product, harmless to the human body and can be biologically neutralized (decomposes). On request, the engine can be filled with pure water.

The submersible SMS and SMP motors are manufactured in 50 Hz and 60 Hz three-phase current versions for voltages in the range up to 500 V. Electricity is supplied to the motor via connected electrical submersible cables.

The dynamically balanced bearing rotor is housed in liquid-lubricated sliding sleeves. The axial forces occurring axial forces of the pump and motor are transmitted by a direction-independent bearing with tilting segments (Kingsburry-ego bearing). An auxiliary axial bearing prevents upward displacement of the pump if the axial force reverses.

A high-quality mechanical face seal prevents the pumped medium from entering the motor. Changes in volume of the fluid filling the motor are compensated by an expansion vessel at the bottom of the motor. The motor is protected is protected by an overpressure valve.

Optionally, a PT-100 sensor is mounted in the motor winding, brought outside the motor with a three-wire cable. The wire can be extended, the connection point protected from water penetration into the interior. It is also necessary to provide insulation between the wires of the cable. Connect the sensor in accordance with the instructions of the temperature transmitter for the system three-wire system. Typically, there are two red wires and one white wire in the cable. The sensor is connected is connected to the red and white wires. The double red wire allows compensation for the resistance of the wire in the transmitter, as long as the transmitter provides this possibility.