# US 2014/0191602 A1 · Electric Motor Systems and Methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191602 A1 - Document ID: US20140191602A1 - Status: Published application - Kind: A1 - Application number: 14/149,290 - Filed: 2014-01-07 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Henry Research and Development, LLC - Inventors: Trevor Hardway; Michael Salerno; Ronald David Wallin - Web page: https://patentgrep.com/patent/US20140191602A1 ## CPC - H02K 5/132: Submersible electric motors (H02K5/128 takes precedence) - E21B 43/128: {Adaptation of pump systems with down-hole electric drives} - H02K 1/16: Stator cores with slots for windings - H02K 1/2706: Inner rotors - H02K 7/083: {radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - H02K 2213/09: Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract Electric motor systems and methods may provide highly efficient operation. The electric motor systems and methods discussed herein provide an oil filled motor that is low speed and utilizes permanent magnets. The electric motor may utilize a large number of poles and fractional slot design. Further, in some embodiments, the electric motor systems and methods may be suitable for use downhole. ## Claims ### Claim 1 An electric motor for operation in a well, the electric motor comprising: a stator providing a plurality of slots, wherein the stator is formed from laminated stack that are bonded; a plurality of windings for the plurality of slots of the stator; a rotor providing a plurality of permanent magnets arranged around the outer circumference of the rotor; a lubrication chamber containing a lubricant for the electric motor, wherein the lubrication chamber is sealed; and a pressure compensation piston for the electric motor positioned in a tubular chamber, wherein a first end of the pressure compensation piston is exposed to the lubricant and a second end is exposed to external fluids or gases, and the pressure compensation piston is movable within the tubular chamber to minimizes a pressure differential between the lubricant for the electric motor and external fluids or gases. ### Claim 2 (depends on 1) The electric motor of claim 1, wherein the electric motor provides a fractional slot design. ### Claim 3 (depends on 1) The electric motor of claim 1, wherein the plurality of slots provide an open slot design. ### Claim 4 (depends on 1) The electric motor of claim 1, wherein the electric motor provides 27 or 39 slots, 8 or 12 poles, and 9 or 13 coils per phase. ### Claim 5 (depends on 1) The electric motor of claim 1, wherein an OD to ID ratio is 1.42 or less, the OD to ID ratio is a ratio of an outside diameter of the stator relative to an inside diameter of the stator. ### Claim 6 (depends on 1) The electric motor of claim 1, wherein a length of the electric motor is 7 feet or less. ### Claim 7 (depends on 6) The electric motor of claim 6, wherein a diameter of the electric motor is 4½ inches or less, and the electric motor is capable of providing 50 ft-lb of torque or greater. ### Claim 8 (depends on 1) The electric motor of claim 1, wherein a stator assembly comprising the laminated stack is heat shrunk into a motor housing. ### Claim 9 (depends on 1) The electric motor of claim 1, wherein slot fill is 50% or greater. ### Claim 10 (depends on 1) The electric motor of claim 1, wherein the plurality of permanent magnets are samarium cobalt magnets. ### Claim 11 (depends on 1) The electric motor of claim 1, further comprising a banding surrounding the plurality of permanent magnet to retain and protect the plurality of magnets. ### Claim 12 (depends on 1) The electric motor of claim 1, wherein the electric motor weighs 100 lbs or less. ### Claim 13 An electric motor comprising: a stator providing a plurality of slots, wherein an OD to ID ratio is 1.42 or less, the OD to ID ratio is a ratio of an outside diameter of the stator relative to an inside diameter of the stator; a plurality of windings for the plurality of slots of the stator; a rotor providing a plurality of permanent magnets arranged around the outer circumference of the rotor; and a lubrication chamber for the electric motor, wherein the lubrication chamber is sealed. ### Claim 14 (depends on 13) The electric motor of claim 13, wherein the electric motor provides a fractional slot design. ### Claim 15 (depends on 13) The electric motor of claim 13, wherein a length of the electric motor is 7 feet or less; and a diameter of the electric motor is equal to or between 3¾ to 4½ inches. ### Claim 16 An electric motor comprising: a stator providing a plurality of slots; a plurality of windings for the plurality of slots of the stator; a rotor providing a plurality of permanent magnets arranged around the outer circumference of the rotor; a lubrication chamber for the electric motor, wherein the lubrication chamber is sealed; and wherein a length of the electric motor is 7 feet or less, and the electric motor is capable of providing 50 ft-lb of torque or greater. ### Claim 17 (depends on 16) The electric motor of claim 16, wherein the motor operates at up to 3600 rpm with an efficiency of 85% or greater. ### Claim 18 (depends on 16) The electric motor of claim 16, wherein the electric motor operates at 380 volts and 10-12 amps under load. ### Claim 19 (depends on 16) The electric motor of claim 16, wherein the electric motor is suitable for operation at depths equal to or between 2,500 to 15,000 feet. ### Claim 20 (depends on 16) The electric motor of claim 16, wherein the electric motor is suitable for operation in environment temperatures equal to or between 180 to 400° F.