Systems and methods for constructing electric motors including both permanent magnet elements and inductive elements. In one embodiment, a motor is implemented of an ESP system has multiple rotor sections that are mounted end-to-end within the bore of the stator. The permanent magnet elements and inductive elements may be combined within individual rotor sections, or they may be segregated so that one rotor section has only one type or the other. The inductive elements of the rotor allow the motor to be started without a VFD, and without knowing the position of the rotor within the motor. The permanent magnet elements synchronize the rotor with the rotating stator fields when the rotor approaches the operating frequency of the drive.

Systems and methods for constructing electric motors including both permanent magnet elements and inductive elements. In one embodiment, a motor is implemented of an ESP system has multiple rotor sections that are mounted end-to-end within the bore of the stator. The permanent magnet elements and inductive elements may be combined within individual rotor sections, or they may be segregated so that one rotor section has only one type or the other. The inductive elements of the rotor allow the motor to be started without a VFD, and without knowing the position of the rotor within the motor. The permanent magnet elements synchronize the rotor with the rotating stator fields when the rotor approaches the operating frequency of the drive.

Systems and methods for electric motor, where the stator core has one or more stator core sections, each of which is a single-piece unit formed of soft magnetic composite (SMC) material, and where the stator core sections are positioned end-to-end with seals at each end to form a plurality of stator slots, where each of the stator slots extends through each of the stator core sections and is in fluid communication with the others to form a sealed stator chamber. The sealed stator chamber may have an expansion chamber to allow expansion and contraction of dielectric fluid in the stator chamber while maintaining separation of the dielectric oil from lubricating oil which is within the motor but external to the stator chamber. The sealed stator chamber can prevent well fluids that leak into the motor from reaching the stator windings and degrading their insulation.

Systems and methods for electric motor, where the stator core has one or more stator core sections, each of which is a single-piece unit formed of soft magnetic composite (SMC) material, and where the stator core sections are positioned end-to-end with seals at each end to form a plurality of stator slots, where each of the stator slots extends through each of the stator core sections and is in fluid communication with the others to form a sealed stator chamber. The sealed stator chamber may have an expansion chamber to allow expansion and contraction of dielectric fluid in the stator chamber while maintaining separation of the dielectric oil from lubricating oil which is within the motor but external to the stator chamber. The sealed stator chamber can prevent well fluids that leak into the motor from reaching the stator windings and degrading their insulation.

For cooling an electric machine having stator windings, a housing including a series of interleading compartments is provided, the compartments being adapted for sealingly and removably enclosing one or more of the stator windings, so that during operation of the machine, a fluent coolant passing through the compartments and immersing the windings removes heat from the windings by thermal conduction. The disclosure has application to electric machines such as electric motors and generators, providing a modularised cooling system for the individual stator windings, allowing each one to be removed if necessary without requiring removal of the whole stator winding assembly.

For cooling an electric machine having stator windings, a housing including a series of interleading compartments is provided, the compartments being adapted for sealingly and removably enclosing one or more of the stator windings, so that during operation of the machine, a fluent coolant passing through the compartments and immersing the windings removes heat from the windings by thermal conduction. The disclosure has application to electric machines such as electric motors and generators, providing a modularised cooling system for the individual stator windings, allowing each one to be removed if necessary without requiring removal of the whole stator winding assembly.

An electric submersible pumping system cable is provided with a plurality of conductors. The electric submersible pumping system cable includes at least one central strength member which may be in the form of a central strength member bundle. The plurality of conductors may be in the form of a plurality of individually insulated conductors arranged about the central strength member. The electric submersible pumping system cable also may include a jacket layer disposed over the insulated conductors.

An electric submersible pumping system cable is provided with a plurality of conductors. The electric submersible pumping system cable includes at least one central strength member which may be in the form of a central strength member bundle. The plurality of conductors may be in the form of a plurality of individually insulated conductors arranged about the central strength member. The electric submersible pumping system cable also may include a jacket layer disposed over the insulated conductors.

An electrical submersible well pump (ESP) has a motor electrical connector mounted to an exterior of the motor. A motor sensor connects to an interior side of the motor electrical connector. Seal first and second electrical connectors mount to an exterior of a seal/motor adapter. A seal internal wire within the seal section electrically connects interior sides of the seal first and second electrical connectors together. An external motor jumper wire extends alongside the motor between the motor electrical connector and the seal first electrical connector. A pump electrical connector mounts to an exterior of a pump/seal adapter and connects to a pump sensor within the pump. An external seal jumper wire connects between the seal second electrical connector and the pump electrical connector.

A motorized pump system includes a switched reluctance motor with a motor rotor and a motor stator, and a pump surrounding the switched reluctance motor. The motor rotor is positioned radially inward or outward of the motor stator, and the pump includes a pump rotor integrated with the motor rotor. The pump rotor includes at least one impeller connected to the motor rotor.