A motorized pump including a motor and a pump around the motor. The pump rotor is integrated with the motor rotor, wherein the pump rotor has vanes. The motorized pump may be employed as an electrical submersible pump (ESP) in a wellbore.

A submersible, high-voltage electrical connector that includes a female connector and a male connector. The female connector has an interior chamber and a conduit configured to connect the interior chamber to an evacuation pump. The male connector is configured to fit within the chamber of the female connector. The conduit of the female connector is further configured to, when the male connector and the female connector are mated, substantially evacuate any liquid from the chamber of the female connector.

A submersible, high-voltage electrical connector that includes a female connector and a male connector. The female connector has an interior chamber and a conduit configured to connect the interior chamber to an evacuation pump. The male connector is configured to fit within the chamber of the female connector. The conduit of the female connector is further configured to, when the male connector and the female connector are mated, substantially evacuate any liquid from the chamber of the female connector.

Motors for use in downhole systems such as electric submersible pumps. In one embodiment, an ESP system includes a pump and a motor which drives the pump. The motor has an elongated cylindrical stator and a rotor which is concentrically positioned within a bore through the stator. The rotor is driven by the stator to rotate within the bore. The stator comprises a plurality of separable, interconnected modular stator sections which may be identical. Between each pair of adjacent stator sections, a corresponding interconnect electrically connects coils of magnet wire in the stator sections to a power source. In some cases, the interconnect between stator sections electrically connects the coils of magnet wire serially in the adjacent stator sections. In other embodiments, the coils in adjacent stator sections are connected in parallel the power source.

Motors for use in downhole systems such as electric submersible pumps. In one embodiment, an ESP system includes a pump and a motor which drives the pump. The motor has an elongated cylindrical stator and a rotor which is concentrically positioned within a bore through the stator. The rotor is driven by the stator to rotate within the bore. The stator comprises a plurality of separable, interconnected modular stator sections which may be identical. Between each pair of adjacent stator sections, a corresponding interconnect electrically connects coils of magnet wire in the stator sections to a power source. In some cases, the interconnect between stator sections electrically connects the coils of magnet wire serially in the adjacent stator sections. In other embodiments, the coils in adjacent stator sections are connected in parallel the power source.

A submersible pump electrical motor has a bearing hub between adjacent rotor sections. The bearing hub has a hub outward facing sidewall and a hub inward facing hub sidewall through which the shaft extends. A collar having a collar inward facing sidewall is rigidly mounted to the hub outward facing sidewall. The collar has a collar outward facing sidewall spaced from stator sidewall by an annular clearance. A slit in the collar extends from the collar inward facing sidewall to the collar outward facing sidewall. An anti-rotation spring has a supporting portion inwardly biased against the hub outward facing sidewall and a locking portion protruding outward through the slit into engagement with the groove to prevent rotation of the hub and the collar.

A submersible pump electrical motor has a bearing hub between adjacent rotor sections. The bearing hub has a hub outward facing sidewall and a hub inward facing hub sidewall through which the shaft extends. A collar having a collar inward facing sidewall is rigidly mounted to the hub outward facing sidewall. The collar has a collar outward facing sidewall spaced from stator sidewall by an annular clearance. A slit in the collar extends from the collar inward facing sidewall to the collar outward facing sidewall. An anti-rotation spring has a supporting portion inwardly biased against the hub outward facing sidewall and a locking portion protruding outward through the slit into engagement with the groove to prevent rotation of the hub and the collar.

A shaft in an electrical submersible pumping system is prevented from rotation in a backspin direction, which is in a direction opposite from its typical forward rotation during normal operation. Backspin rotation is prevented with a device that includes teeth coupled to the shaft and a stationary pawl disposed in a rotational path of the teeth. Each tooth has a forward surface that contacts the pawl during forward rotation of the shaft, the forward surfaces are each configured with a profile to slide along and past the pawl without impeding shaft rotation. Rotation in the backspin direction engages the pawl with rearward surfaces of the teeth, which are configured to impede shaft rotation when engaged. Fluid being handled by the pumping system flows through a passage in the device and absorbs friction generated thermal energy from the device.

A shaft in an electrical submersible pumping system is prevented from rotation in a backspin direction, which is in a direction opposite from its typical forward rotation during normal operation. Backspin rotation is prevented with a device that includes teeth coupled to the shaft and a stationary pawl disposed in a rotational path of the teeth. Each tooth has a forward surface that contacts the pawl during forward rotation of the shaft, the forward surfaces are each configured with a profile to slide along and past the pawl without impeding shaft rotation. Rotation in the backspin direction engages the pawl with rearward surfaces of the teeth, which are configured to impede shaft rotation when engaged. Fluid being handled by the pumping system flows through a passage in the device and absorbs friction generated thermal energy from the device.

A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.