Abstract: A heel assembly of a submersible oil-filled electric motor contains a thrust bearing and an annular heel having grooves, enabling pumping liquid into the grooves when the heel rotates. The heel assembly is made with a through channel for fluid flow. At least part of the surface of the channel is formed by the inner annular surfaces of the heel and thrust bearing, and the above grooves are arcuate and form at least the first and second group of grooves. In the first group of grooves, each groove is made with an end closed for the fluid flow and with an end open for the fluid flow, located on the outer boundary of the annular heel with an outer diameter D1. In the second group of grooves, each groove is made with an end closed for the fluid flow and with an end open for the fluid flow.

Abstract: A drive of a submersible pump having a housing, an oil-filled electric motor, a heat exchanger and a compensator hydraulically connected by an oil channel to the oil-filled cavity of the electric motor. The drive has channels to circulate oil in the drive for heat exchange between the oil and the well fluid. Inside the heat exchanger, there is a through channel of the heat exchanger for the well fluid flow. The compensator has a diaphragm placed in a cylindrical casing adjoining an outer side surface of the diaphragm to an inner side surface of the cylindrical casing. The through channel of the heat exchanger for the well fluid flow has an annular cross-section with an inner wall formed by the outer side surface of the cylindrical casing and with an outer wall formed by an inner surface of the cylindrical sleeve of the heat exchanger.

Abstract: An apparatus is disclosed that increases an efficiency of the submersible brushless motor with annular magnetic segments on the rotor (increase in efficiency) (by minimizing static losses during the passage of the magnetic flux through the stator magnetic circuit) while increasing its meant time between failures (MTBF) by ensuring efficient operation of a cooling circulation circuit electric motor (by simultaneously providing the maximum possible cross-section and the maximum surface for heat transfer in a flow longitudinal circulation channel formed between the surfaces of the magnetic circuit and the rotor).