Modular linear motor and method of constructing and using same

• US 5,831,353 A
• Filed: 10/11/1995
• Issued: 11/03/1998
• Est. Priority Date: 10/17/1994
• Status: Expired due to Fees

• Current Assignee: Uniflo Oilcorp Limited
• Original Assignee: Uniflo Oilcorp Limited
• Inventors: Bolding, Vance E., Hallidy, William M.
• Primary Examiner(s): Dougherty, Thomas M.
• Assistant Examiner(s): JONES, JUDSON
• Application Number:
  US08/540,936
• Time in Patent Office: 1,119 Days
• Field of Search: 310/12, 310/112, 417/417, 417/418, 417/448, 417/416, 417/449
• US Class Current: 310/12.15
• CPC Class Codes: F04B 17/046 the fluid flowing through the moving part of the motor
• CPC Class Codes: F04B 47/06 having motor-pump units situated at great depth
• CPC Class Codes: H02K 41/035 DC motors; Unipolar motors

Abstract

The modular linear motor includes at least a pair of like stator modules and at least a pair of like mover modules. A stator module coupler interconnects the like stator module and has an axial length of sufficient dimension to maintain a given three phase stator pole pitch between the interconnected stator modules. A mover module coupler interconnects the like mover modules, and has another axial length of sufficient dimension to maintain a given mover pole pitch between the interconnected mover modules.

Claims

1. A method of constructing a linear motor comprising:

using at least two like elongated cylindrically shaped hollow stator modules, each stator module having spaced apart oppositely threaded end segments axially disposed thereon;

each stator module further having a plurality of spaced apart stator coils extending throughout its entire axial length for defining a given three phase stator pole pitch of a given axial length;

interconnecting said at least two like stator modules with an elongated cylindrically shaped hollow stator coupler having an interior threaded wall, said wall having one portion adapted to engage threadably one of the oppositely threaded end segments of a stator module and another portion of said wall being adapted to engage threadably an opposite one of the oppositely threaded end segments of another stator module;

said stator coupler having an axial length of sufficient dimension to maintain said given three phase pole pitch between interconnected stator modules;

using at least two like elongated cylindrically shaped hollow mover modules, each mover module having a hollow shaft with spaced apart like poled ring shaped permanent magnets mounted thereon and disposed on diametrically opposite ends thereof;

each mover module further having a plurality of spaced apart oppositely poled ring shaped permanent magnets mounted on said shaft disposed between said spaced apart like poled permanent magnets for defining a series of alternating magnetic mover poles;

each mover module further having a plurality of ring shaped bearing units mounted on said shaft and interleaved with said permanent magnets for helping to equally space them apart throughout the entire axial length of the mover module;

interconnecting said at least two like mover modules with an elongated cylindrically shaped hollow mover coupler having an interior threaded wall with an upper portion and a lower portion, said upper portion for threadably coupling one of the mover modules and said lower portion for threadably coupling another one of the mover modules;

said mover coupler having an axial length of sufficient dimension to maintain the mover pole pitch between interconnected mover modules; and

placing the interconnected mover modules in the hollow interior of the interconnected stator modules to enable them to interact electromagnetically.

2. In a motor construction, a method of constructing a linear motor stator, comprising:

using at least two like elongated cylindrically shaped hollow stator modules, each stator module having spaced apart oppositely threaded end segments disposed on diametrically opposite ends thereof;

each stator module further having a plurality of spaced apart stator coils extending throughout its entire axial length for defining a given three phase stator pole pitch of a given axial length;

interconnecting said at least two like stator modules with an elongated cylindrically shaped hollow stator coupler having an interior threaded wall, said wall having one portion adapted to engage threadably one of the oppositely threaded end segments of a stator module and another portion of said wall being adapted to engage threadably an opposite one of the oppositely threaded end segments of another stator module; and

said stator coupler having an axial length of sufficient dimension to maintain said given three phase pole pitch between interconnected stator modules.

3. In a motor construction, a method of constructing a linear motor mover, comprising:

using at least two like elongated cylindrically shaped hollow mover modules, each mover module having a hollow shaft with spaced apart like poled ring shaped permanent magnets mounted thereon and disposed on diametrically opposite ends thereof;

each mover module further having a plurality of spaced apart oppositely poled ring shaped permanent magnets mounted on said shaft disposed between said spaced apart like poled permanent magnets for defining a series of alternating magnetic mover poles;

each mover module further having a plurality of ring shaped bearing units mounted on said shaft and interleaved with said permanent magnets for helping to equally space them apart throughout the entire axial length of the mover module;

interconnecting said at least two like mover modules with an elongated cylindrically shaped hollow mover coupler having an interior threaded wall with an upper portion and a lower portion, said upper portion for threadably coupling one of the mover modules and said lower portion for threadably coupling another one of the mover modules;

said mover coupler having an axial length of sufficient dimension to maintain the mover pole pitch between interconnected mover modules; and

placing the interconnected mover modules in the hollow interior of the interconnected stator modules.

4. In a motor construction, a method of constructing a linear motor stator, comprising:

using at least two like elongated cylindrically shaped hollow stator modules, each stator module having spaced apart oppositely threaded end segments disposed on diametrically opposite ends thereof;

each stator module further having a plurality of spaced apart stator coils extending throughout its entire axial length for defining a given three phase stator pole pitch of a given axial length;

interconnecting said at least two like stator coupler having an interior threaded wall, said wall having one portion adapted to engage threadably one of the oppositely threaded end segments of a stator module and another portion of said wall being adapted to engage threadably an opposite one of the oppositely threaded end segments of another stator module; and

said stator coupler having an axial length of sufficient dimension to maintain said given three phase pole pitch between interconnected stator modules; and

producing a plurality of substantially like hollow inner tubular root members, each member having a pair of half stator teeth disposed on opposite terminal ends of the member and a plurality of spaced part full teeth members disposed between said half teeth for defining a given number of spaced apart coil receiving slots extending throughout the entire axial length of the inner member;

producing an upper hollow outer tubular root member having an upper half stator tooth member disposed on one of its terminal ends and a right hand threaded end portion disposed on its other terminal end;

said upper member having a plurality of spaced part full tooth members disposed between said upper half tooth member and said right had threaded end portion for defining another given number of spaced apart coil receiving slots extending throughout the entire axial length of the upper member;

producing a lower hollow outer tubular root member having a lower half stator tooth member disposed on one of its terminal ends and a left hand threaded end portion disposed on its other terminal end;

said lower member having a plurality of spaced part full tooth members disposed between said lower half tooth member and said left hand threaded end portion for defining yet another given member of spaced part coil receiving slots extending throughout the entire axial length of the lower member;

assembling together in a stack a given number of said substantially like hollow inner tubular root members;

assembling one terminal end of said stack of inner root members to the half stator tooth of said upper hollow outer root member to form a full stator tooth;

assembling the other terminal end of said stack of inner root members to the half stator tooth of said lower hollow outer root member to form another full stator tooth;

forming a phase A winding in every third coil receiving slot with a single phase A wire, each one of said phase A winding being substantially ring shaped;

forming a phase B winding in ever third coil receiving slot adjacent to a phase A winding with a single phase B wire, each one of said phase B winding being substantially ring shaped;

forming a phase c winding in every third coil receiving slot adjacent to phase B winding with a single phase C wire;

each of said phase C windings being substantially ring shaped;

mounting a hollow tubular yoke member over the assembled hollow inner tubular members and upper and lower tubular members to form one of said at least two like stator threaded end portion extending from one terminal end thereof and said left hand threaded end portion extending from the other terminal end thereof.

5. A method according to claim 4, wherein said step of using at least two like stator modules further includes:

repeating said steps of assembling, assembling, assembling, forming, forming, forming and mounting another hollow tubular yoke member over the last mentioned assembled hollow inner tubular members and upper and lower tubular members to form another one of said at least two yoke stator modules, said another stator module having said right hand threaded end portion extending from one terminal end thereof and said left hand threaded end portion extending from the other terminal end thereof.

6. A modular tubular linear motor for use in an elongated hollow ferromagnetic tube, comprising:

a plurality of elongated like mover segments each having a plurality of equally spaced apart pairs of oppositely poled permanent magnets disposed between and equally spaced apart from a pair of like poled permanent magnets for generating a plurality of equally spaced apart pairs of oppositely poled magnetic flux fields;

each individual one of said permanent magnets being generally ring shaped, radially polarized, and having a given longitudinal dimension l;

coupler means disposed between abutting pairs of said like poled permanent magnets for mechanically interconnecting said plurality of mover segments together to define a modular mover having an axial length L, said coupler means having a longitudinal dimension substantially equal to l for spacing the abutting pairs of like poled permanent magnets a sufficient distance to help maintain mover pole pitch throughout the entire axial length L of said modular mover;

a plurality of elongated like stator segments each having a plurality of equally spaced apart pairs of oppositely wound coils for generating a plurality of equally spaced apart pairs of magnetic fields having opposite polarities;

each individual one of said stator segments having a plurality of sets of equally spaced apart like sized ring shaped stator teeth each having a longitudinal dimension, each set being disposed between a pair of half sized ring shaped stator teeth, said half sized teeth each having one-half the longitudinal length of said like sized teeth, and a pair of spaced apart male and female couplers each having another plurality of equally spaced apart like sized stator teeth and a single half size stator tooth substantially equal in dimension to an individual one of said pair of half sized teeth;

wherein individual ones of said pair of half sized teeth and a corresponding individual ones of said single half size stator teeth are abutted together to form a full size tooth for helping to maintain stator pole pitch through the entire axial length of said segments;

wherein said pairs of spaced apart male and female couplers are interconnected with corresponding ones of the respective female and male couplers of other ones of said like stator segments to define a modular stator terminating at one of its ends in a single one of the male couplers and at its opposite end in a single one of the female couplers; and

whereby said single one of the male couplers is adapted to be mechanically and electrically connected to a source of power for electrically energizing the motor.

7. A modular tubular linear motor for use in an elongated hollow ferromagnetic tube, comprising:

upper elongated mover means having a pair of upper like poled permanent magnets mounted at opposite ends thereof and a plurality of equally spaced apart pairs of oppositely poled upper permanent magnets mounted between and equally spaced apart from said pair of upper like poled magnets for generating pairs of oppositely poled upper magnetic flux fields;

lower elongated mover means having a pair of lower like poled permanent magnets mounted at opposite ends thereof and a plurality of equally spaced apart pairs of oppositely poled lower permanent magnets mounted between and equally spaced apart from said pair of lower like poled magnets for generating pairs of oppositely poled lower magnetic flux fields;

mover coupler means for coupling mechanically said upper and lower mover means together to define a modular mover having an axial length L;

said mover coupler means, said upper and lower oppositely poled magnets and said upper and lower like poled magnets each having substantially the same longitudinal dimension for helping to maintain phasing across pairs of upper and lower mover means;

elongated hollow stator stack tube means having a sufficient diameter to be received with said ferroelectric tube for interacting electromagnetically with it to help produce a motor thrust of a given force;

said stator stack means including yoke means having a sufficient axial length to receive said modular mover therewithin for free relative movement;

upper elongated hollow stator means mounted mechanically within said yoke means for generating a plurality of pairs of oppositely poled equally spaced apart upper electromagnetic fields to interact with said upper and lower magnetic flux fields to cause said modular mover to move rectilinearly reciprocatively within said stator stack means;

lower elongated hollow stator means mounted mechanically within said yoke means for generating a plurality of pairs of oppositely poled equally spaced apart lower electromagnetic fields to interact with said lower and lower magnetic flux fields to cause said modular mover to move rectilinearly reciprocatively within said stator stack means;

stator coupling means for coupling mechanically said upper and lower stator means together to define a modular stator having an axial length substantially the same as said axial length L;

said stator coupling means, said upper stator means and said lower stator means each having substantially the same longitudinal dimension for helping to maintain phasing across pairs of upper and lower stator means; and

said stator coupling means, said upper stator means, said lower stator means further each having a centrally disposed thin hollow ferroelectric tube of sufficient diameter to receive said modular mover therewithin for free relative movement.

8. A modular tubular linear motor according to claim 7, further comprising:

end connector means having three conductors connected together via a common node to form a Y connection.

9. A modular tubular linear motor for use in an elongated hollow ferromagnetic tube, comprising:

top elongated tube means for defining a plurality of magnetic flux paths coupled electromagnetically to a corresponding plurality of magnetic flux paths established in the ferromagnetic tube;

a top pair of spaced apart like poled permanent magnets mounted at opposite ends of said top tube means for generating a pair of like poled magnetic flux fields;

a top plurality of equally spaced apart pairs of oppositely poled permanent magnets mounted on said top tube means and equally spaced apart from said top pair of like poled permanent magnets for generating a plurality of pairs of oppositely poled magnetic flux fields;

bottom elongated tube means for defining a plurality of magnetic flux paths coupled electromagnetically to a corresponding plurality of magnetic flux paths established in the ferromagnetic tube;

a top pair of spaced apart like poled permanent magnets mounted at opposite ends of said bottom tube means for generating a pair of like poled magnetic flux fields;

a bottom plurality of equally spaced apart pairs of oppositely poled permanent magnets mounted on said bottom tube means and equally spaced apart from said bottom pair of like poled permanent magnets for generating a plurality of pairs of oppositely poled magnetic flux fields;

coupler means for coupling said top permanent magnets and said bottom permanent magnet together to define a modular mover having an axial length L;

said coupler means, said top and bottom like poled magnets and said oppositely poled magnets each having substantially the same longitudinal dimension;

elongated ferromagnetic yoke tube means having a sufficiently large diameter to be received within the ferromagnetic tube;

elongated upper stator means coupled mechanically to said yoke tube means for coupling electrically to power means to facilitate the establishment of a plurality of upper electromagnetic fields to interact with the magnetic fields produced by certain ones of said top and bottom permanent magnets to cause said modular mover means to move rectilinearly reciprocatively along a mover path of travel having a given axial length l;

elongated lower stator means mechanically coupled to said yoke tube means and to said upper stator means for cooperating with said upper stator means to cause said modular mover means to move rectilinearly reciprocatively along said mover path of travel;

said upper stator means and said lower stator means each being substantially identical and each including;

top end stator tube means coupled mechanically to said yoke tube means and having a sufficiently large longitudinal dimension for receiving a top portion of said modular mover therewithin for free relative movement;

both end stator tube means coupled mechanically to said yoke tube means and having substantially the same first mentioned longitudinal dimension for receiving a bottom portion of said modular mover therewithin for free relative movement;

elongated middle stator tube means disposed with said yoke tube means between said top and bottom tube means and having substantially the same first mentioned longitudinal dimension for receiving a middle portion of said modular mover therewithin for free relative movement;

top connector means mounted on said to end stator tube means for mechanically and electrically coupling to said power means and having a plurality of equally spaced apart top end stator teeth including a top segment stator tooth disposed at a distal end of said top end stator tube means for helping to define a given number of top coil receiving slots;

bottom connector means mounted on said bottom end stator tube means for mechanically and electrically coupling to said power means and having a plurality of equally spaced apart bottom end stator teeth including a bottom segment stator tooth disposed at a distal end of bottom end stator tube means for helping to define a given number of bottom coil receiving slots;

a pair of spaced apart like stator teeth mounted on opposite ends of said middle stator tube for abutting said top segment stator tooth and said bottom segment stator tooth respectively to form a pair of middle stator teeth having substantially like dimensions to individual ones of said top end and said bottom end stator teeth for helping to maintain stator pole pitch;

a plurality of equally spaced apart intermediate stator teeth mounted along said middle stator tube means between said middle stator teeth for helping to define a given number of middle coil receiving slots;

phase A conductor means mounted continuously within selected axially spaced apart ones of said top, bottom and middle coil receiving slots for defining a plurality of equally spaced apart pairs of oppositely wound phase A coils;

phase B conductor means mounted continuously within selected axially spaced apart other ones of said top, bottom and middle coil receiving slots for defining a plurality of equally spaced apart pairs of oppositely wound phase B coils;

phase C conductor means mounted continuously within the remaining axially spaced apart ones of said top, bottom and middle coil receiving slots for defining a plurality of equally spaced apart pairs of oppositely wound phase C coils;

means for connecting electrically one set of ends of said phase A, phase B, and phase C conductor means to form a common node therebetween; and

means at the other end of said phase A, phase B, and phase C conductor means for coupling them electrically to said power source.