Abstract: An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

Abstract: A fluid choke may include a housing and a shuttle configured to move within an interior chamber of the housing. The housing may have a fluid inlet channel and a fluid outlet channel. The shuttle may have a gate connected to an end of the shuttle and the gate may be configured to mate with a seat located in the housing at the fluid outlet channel. The shuttle may be moved within the interior chamber by a pressurized hydraulic fluid configured to apply a hydraulic pressure to a peripheral portion of the shuttle, an inner portion of the shuttle, and the gate.

Abstract: A multi-speed electric motor may include a plurality of windings arranged into winding phase groups. A speed controller may switch two or more windings between a series and a parallel configuration in each winding phase group. The speed controller may also switch the winding phase groups between a delta and a Wye configuration. By selecting a specific configuration, one or more of the holding torque, torque ratio, no-load maximum speed, and volts/Hz ratio of the AC motor may be optimized for a given application. In some embodiments, the AC motor may be used as part of a piece of drilling rig equipment such as a drawworks, winch, mud pump, top drive, or rotary table.

Abstract: A permanent magnet for a permanent magnet electric motor is bonded to a rotor. A hole having a chamfered outer edge is formed in the permanent magnet. A corresponding mounting hole is formed in the body of the rotor. A bolt is threaded through the hole in the permanent magnet and threaded into the mounting hole of the rotor. An O-ring is positioned between the head of the bolt and the permanent magnet. The O-ring may be made of an elastomeric material which may prevent cracking of the permanent magnet as components of the electric motor expand and contract with fluctuations in temperature. A magnet may be held to a rotor by a dovetail or may include a flange to be held to the rotor by a retaining ring.

Abstract: An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

Abstract: A method for coupling a permanent magnet to a rotor body of an electric motor includes providing a rotor body having an outer surface. A mounting hole is formed in the rotor body. A permanent magnet in the form of an annular section is provided. The concave surface of the permanent magnet has a diameter generally equal to the outer diameter of the rotor body. The permanent magnet has a hole formed therein to receive the threaded connector, the hole having a countersink at the convex surface of the permanent magnet. The permanent magnet is positioned on the outer surface of the rotor body such that the hole lines up with the mounting hole, an elastomeric body is positioned in the countersink, and the threaded connector is positioned through the elastomeric body and the hole of the permanent magnet to couple to the rotor body.

Abstract: An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

Abstract: A fluid choke may include a housing and a shuttle configured to move within an interior chamber of the housing. The housing may have a fluid inlet channel and a fluid outlet channel. The shuttle may have a gate connected to an end of the shuttle and the gate may be configured to mate with a seat located in the housing at the fluid outlet channel. The shuttle may be moved within the interior chamber by a pressurized hydraulic fluid configured to apply a hydraulic pressure to a peripheral portion of the shuttle, an inner portion of the shuttle, and the gate.

Abstract: A multi-speed electric motor may include a plurality of windings arranged into winding phase groups. A speed controller may switch two or more windings between a series and a parallel configuration in each winding phase group. The speed controller may also switch the winding phase groups between a delta and a Wye configuration. By selecting a specific configuration, one or more of the holding torque, torque ratio, no-load maximum speed, and volts/Hz ratio of the AC motor may be optimized for a given application. In some embodiments, the AC motor may be used as part of a piece of drilling rig equipment such as a drawworks, winch, mud pump, top drive, or rotary table.

Abstract: A permanent magnet for a permanent magnet electric motor is bonded to a rotor. A hole having a chamfered outer edge is formed in the permanent magnet. A corresponding mounting hole is formed in the body of the rotor. A bolt is threaded through the hole in the permanent magnet and threaded into the mounting hole of the rotor. An O-ring is positioned between the head of the bolt and the permanent magnet. The O-ring may be made of an elastomeric material which may prevent cracking of the permanent magnet as components of the electric motor expand and contract with fluctuations in temperature. A magnet may be held to a rotor by a dovetail or may include a flange to be held to the rotor by a retaining ring.

Abstract: An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.

Abstract: A method and apparatus for forming a mast assembly upon a floor of a drilling rig has a support structure, a first carriage assembly affixed to one side of the support structure and a second carriage assembly affixed to an opposite side of the support structure. Each of the first and second carriage assemblies are connectable to a section of the mast assembly. Drive cylinders are associated with the first and second carriage assemblies so as to cause the section of the mast assembly to move upwardly relative to the support structure. While the section of the mast assembly is retained in an elevated position, another section of the mast assembly can be placed within the support structure and joined to the elevated mast section. Additional mast sections can be connected together in a similar manner.

Abstract: Contemplated methods for welding stainless steel substantially improve welding speed and quality. Most typically, such attributes are achieved by welding a root pass using GMAW-Sm to thereby depositing a root, welding a hot pass using GMAW-P to thereby deposit additional weld metal onto the root, and by welding at least one of a fill pass and a cap pass using at least one of GMAW-P and FCAW.

Abstract: Composition which can be used in particular as odorant for a gaseous fuel, more particularly natural gas, comprising: from 0.1 to 49.9% of an alkyl sulphide (I) of formula: R1—S—R2 ?in which R1 and R2, which are identical or different, represent: an alkyl radical comprising from 1 to 4 carbon atoms; or R1 and R2, taken with the sulphur atom to which they are attached, represent a saturated or unsaturated ring comprising from 3 to 5 carbon atoms which is optionally substituted by a C1-C4 alkyl or C1-C4 alkenyl radical; from 50 to 99.8% of an alkyl acrylate (II), the alkyl radical of which comprises from 1 to 12 carbon atoms, preferably from 1 to 8; from 0.001 to 0.1 part by weight of a compound (III) which inhibits the polymerization of the alkyl acrylate (II).

Abstract: A cost-effective, scalable technique for producing microspheres loaded with biologically active solid proteins is provided. The microspheres degrade over time and release biologically active VEGF, as demonstrated by the proliferation of HUVECs in vitro compared to negative controls. A defined concentration of microspheres can deliver a quantifiable level of VEGF with known release kinetics. The invention can be used with other growth factors and applied to tissue engineering applications such as the regeneration of peripheral nerve, bone, adipose tissue, and solid organs.

Abstract: Instead of huge dams, nuclear power plants, wind mills, coal burning furnaces, and burning oil and gas to produce electricity, there is another method. The power that can be provided by the forward motion and weight of vehicular traffic. No cost, no waste, no great distances from point of access to customer. This is available wherever there is substantial highway traffic. Simple mechanical mechanisms can be invented to utilize the power of the massive highway traffic which continuously fills the highways of the modern world.

Abstract: A pneumatic tire of the type comprising a carcass reinforced by radially extending cords, surmounted in the crown region by a substantially inextensible belt, reduces rim stress by virtue of having bias angle cord reinforcements in the lower sidewalls and the terminal portions of all radially extending carcass cords turned axially outwardly. Further reduction of rim stress by the tire is effected by employing a belt construction that resists bending.