US20100084938A1 - Regenerative motor and coil - Google Patents

Regenerative motor and coil Download PDF

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Publication number
US20100084938A1
US20100084938A1 US12/542,412 US54241209A US2010084938A1 US 20100084938 A1 US20100084938 A1 US 20100084938A1 US 54241209 A US54241209 A US 54241209A US 2010084938 A1 US2010084938 A1 US 2010084938A1
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US
United States
Prior art keywords
motor
rotor
magnet
core
coils
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US12/542,412
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English (en)
Inventor
Denis L. Palmer
Robert A. Palmer, Jr.
Damian Riddoch
Edward Butler
Charles Palmer
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MILLENNIAL RESEARCH Corp
Millennial Res Corp
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Millennial Res Corp
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Priority to US12/542,412 priority Critical patent/US20100084938A1/en
Assigned to MILLENNIAL RESEARCH CORPORATION reassignment MILLENNIAL RESEARCH CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PALMER, CHARLES, PALMER, ROBERT A., JR., PALMER, DENIS L., BUTLER, EDWARD, RIDDOCH, DAMIAN
Publication of US20100084938A1 publication Critical patent/US20100084938A1/en
Assigned to PALMER, DOUG, PALMER, DENIS, HILL, RETURN G, MATTHEWS, DEAN, PALMER, BOB, PALMER, BOB, SR, PALMER, CHUCK, PALMER, STAN, POTTER, KEVEN, STAKER, LYNN, UNGER, CODY reassignment PALMER, DOUG LIEN (SEE DOCUMENT FOR DETAILS). Assignors: MILLENNIAL RESSEARCH CORPORATION
Priority to US13/601,543 priority patent/US9800111B2/en
Priority to US13/871,729 priority patent/US10038349B2/en
Assigned to VENTURI, LLC reassignment VENTURI, LLC LIEN (SEE DOCUMENT FOR DETAILS). Assignors: MILLENNIAL RESEARCH CORPORATION
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/47—Air-gap windings, i.e. iron-free windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors

Definitions

  • the present invention relates generally to electric motors, and more particularly to a regenerative motor with a novel coil.
  • the iron around which a copper wire is wound, is used to transmit the flux from where it is created from the copper windings to where it is needed to be used at the rotor/stator interface area.
  • the motor according to the present invention is a highly efficient electric motor which can he embodied in several configurations, including a standard motor, a huh motor, a linear motor, or other motor configuration.
  • the motor may also act as a part-time or full-time electrical generator.
  • coils and cores are important elements of the design.
  • the cores in the coils contain minimal or no iron-based materials, depending on the embodiment and design performance requirements, and are used to produce magnetic flux at the point of use rather than transmitted through iron or iron laminates from a point of creation to a point of use.
  • the invention contains discrete coils in most embodiments, not all of the coils must be used as full-time motor coils or generator coils. Some applications may require simultaneous use of some coils as motor driver coils and others as generator coils. For example, a portion of the generator coils may be used as a transformer of power to produce a unique required voltage or current for a given load as opposed to using a standalone transformer or other solid-state regulation device.
  • the motor may operate using some or all of the coils to drive a load and later an operator may signal for the motor to act as a generator, using some or all of the coils for regenerative braking, such as in an electric vehicle application. Coils may also be disabled in an individual or collective basis as needed for incremental increase or decrease of motor torque output or generator input.
  • the coils are controlled by an electrical timing system, which inputs electrical energy into the coils in a cyclical +/ ⁇ and ⁇ / ⁇ alternation fashion. Timing can be adjusted by retarding or advancing the point at which the electrical input switches from +/ ⁇ to ⁇ /+ and ⁇ /+ to +/ ⁇ . The adjustment of the timing can affect both torque and speed. Optimal timing results in higher efficiency relative to suboptimal timing.
  • the coils can be used to drive a load, usually through a power rectification device converts the alternating current to direct current.
  • the circuit is preferably capable of switching between the coil power switching circuit path and the rectifier output circuit path.
  • the motor according to the present invention is an electric motor that 1) contains one or more stationary stators, each of which optimally has a rotor on each side of each stator with a single rotor between each stator segment, 2) optimally, a shunt path outside of the rotor on each end of the stator/rotor stack, 3) one or more magnets in the rotors arrayed as described in this description of the invention, 4) one or more coils in the stators arrayed as described in this description of the invention, 5) internal or external motor control circuitry, 6) optionally includes an epicyclic gear set within one or more of the rotors, and 7) optionally includes a locking or clutch mechanism for locking the ring gear of the epicyclic gear set relative to the motor housing or stators.
  • the motor according to the present invention is an electric motor that 1) attaches to a stationary or moving spindle or axle, 2) contains one or more stators of rotors optimized for maximum performance based on permanent magnetic in the rotor and coils in the stator using a minimum of iron-based core material, 3) internal or external motor control circuitry, 4) connects to internal or external energy storage, 5) optionally includes a system for receiving remote control instructions, 6) optionally includes a system for sending remote status updates to a central control computer, 7) optionally includes an internal epicyclic gear set, 8) optionally includes a locking or clutch mechanism for locking the spindle to the motor output.
  • the present invention is an electric motor that contains 1) a linear stator and rotor or linear stator/rotor stack, 2) rotors having one or more magnets, and 3) stators having one or more coils.
  • Radially-oriented motors are variations from the above motors (and generators) in that the magnets and coils (or coils and coils) are oriented along radials rather than axial parallels.
  • the motor could be configured with magnets around a rotor on the outer cylindrical surface and coils could then he placed on a stator configured in a concentric array aligned radially from the rotor.
  • This concept is also able to he used in rotor/stator stacks, or multiple concentric arrays of magnets and coils or arrays of coils on a rotor and coils on a stator.
  • the design could he scaled by adding more concentric arrays or by stacking multiple sections of concentric arrays along the motor axis.
  • the present invention can he embodied in other motor configurations, including but not limited to pancake motors and cup motors.
  • the coils drive or are driven by permanent magnets; however, in other embodiments the coils can be used to drive or be driven by other coils.
  • a motor composed of a stator and a rotor.
  • the stator has an array of coils arranged therein.
  • the rotor has an array of magnets arranged therein.
  • Each of the coils includes a first winding of wire wrapped around a core, arid the wire has a non-circular cross-section.
  • the wire is a flattened wire.
  • each of the coils further includes a second winding of wire wrapped around the core.
  • the first and second windings are made up of a singe wire, and the first and second windings are oriented opposed to each other.
  • the windings cane be formed in a first printed circuit board in a spiral form.
  • the motor has a plurality of coil modules and each of the coils is arranged in each of the coil modules.
  • the core is a substantially ironless core.
  • the core can be an air core.
  • the core has a shape generally matching a cross-sectional shape of the magnet.
  • the core is non-circular.
  • the core can be composed of a gauge wire.
  • the core is composed of thin steel with a slit.
  • the motor can be a huh motor.
  • the motor can be a linear motor.
  • the motor can be a regenerative motor, and each of the coils can be regulated separately.
  • the motor can include an epicycle gear set.
  • a motor having a stator and a rotor.
  • the stator has an array of coils arranged in the stator
  • the rotor has an array of magnets arranged in the rotor.
  • Each of the coils has a winding of wire wrapped around a core
  • each of the magnet has a first pole face, a second pole face and a middle portion between the first pole face and the second pole face.
  • the first pole face is narrower than the middle portion.
  • the second pole face is narrower than the middle portion.
  • the magnet has a first step formed adjacent to the first pole face.
  • the magnet can further have a second step formed adjacent to the second pole face.
  • the first and second steps can be pie-shaped steps.
  • the magnet can have an angled edge formed adjacent to the first pole face.
  • the array of magnets can be arranged circumferentially around an axis of the rotor.
  • the magnet has an inner end disposed close to the axis of the motor and an outer end disposed remote from the axis of the motor.
  • the inner end of the magnet is preferably narrower than the outer end of the magnet.
  • the inner end of the first pole face of the magnet is narrower than the outer end of the first pole face of the magnet.
  • Each of the magnets can be composed of two or more magnet pieces stacked one on top of the other.
  • the core has a shape generally matching a shape of the first pole face of the magnet.
  • a motor having a stator and a rotor.
  • the stator has an array of coils arranged in the stator, and the rotor has an army of magnets arranged in the rotor.
  • Each of the coils has a winding of wire wrapped around a core.
  • the core has a first pole face, a second pole face and a middle portion between the first and second pole faces. In this embodiment, the middle portion has a reduced width than the first and second pole faces.
  • a motor having a stator and a rotor.
  • the stator has an array of coils arranged in the stator
  • the first rotor has an array of magnets arranged in the first rotor.
  • Each of the coils has a winding of wire wrapped around a core.
  • Each of the magnets has a width, a length, and a height.
  • the core has a width, a length, and a height.
  • each of the magnets is distanced from adjacent magnets by a magnet distance, and the magnet distance is no less than the width of the magnet.
  • the magnet distance is no more than the length of the magnet.
  • the motor can further have a second rotor having an array of magnets arranged in the second rotor.
  • the magnet of the first rotor is distanced from an adjacent one of the magnets of the second rotor by a magnet gap, and the magnet distance is no less than the magnet gap.
  • the width of the core is no less than the width of the magnet.
  • the height of the magnet is no less than the height of the core.
  • a coil module for a motor.
  • the coil module includes a core and a first winding of a wire wrapped around the core.
  • the wire has a non-circular cross-section.
  • the wire can be a conductor path printed on a printed circuit hoard in a spiral form.
  • the wire can be a flattened wire.
  • FIG. 1 is a perspective view of an embodiment of a motor according to the present invention.
  • FIG. 2 is a partially exploded view of the motor of FIG. 1 .
  • FIG. 3A is an enlarged view of the coil module of the stator of the motor of FIG. 1 ; and FIG. 3B is another enlarged view of the coil module of FIG. 3A from a different direction.
  • FIG. 4 is a perspective view of a variant of the coil according to the present invention, wherein the coil is made up of a winding of a flattened wire wrapped around a circular air core.
  • FIG. 5 is a perspective view of another variant of the coil according to the present invention, wherein the coil comprises two sets of side-by-side windings of a flattened wire wrapped around a circular air core, with the windings oriented opposed to each other.
  • FIG. 6 is a perspective view of another variant of the coil according to the present invention, wherein the coil comprises two sets of side-by-side windings of a flattened wire wrapped around a circular air core, with the windings oriented in the same direction
  • FIG. 7 is a perspective view of another variant of the coil according to the present invention, wherein the coil comprises a winding of a flattened wire wrapped around a generally rectangular air core.
  • FIG. 8 is a perspective view of another variant of the coil according to the present invention, wherein the coil is formed by layering a plurality of printed circuit boards.
  • FIG. 9 is a perspective view of a variant of the core according to the present invention, wherein the core is made up of a series of small gauge wires.
  • FIG. 10 is a perspective view of another variant of the core according to the present invention, wherein the core is made up of thin steel with slits.
  • FIG. 11 is a perspective view of another variant of the core according to the present invention, wherein the core has a reduced width in the middle portion.
  • FIG. 12A is a perspective view of a variant of the magnet according to the present invention, wherein the magnet has a pie-shaped step at the narrow end on the top;
  • FIG. 12B is a perspective view of another variant of the magnet, wherein the magnet has two pie-shaped steps at the narrow end on the top and on the bottom, respectively;
  • FIG. 12C is a perspective view of another variant of the magnet, wherein the magnet is made up of two pieces stacked one on top of the other, each having pie-shaped steps; and
  • FIG. 12D is a perspective view of another variant of the magnet with angled surface.
  • FIG. 13 shows preferred design rules for optimal performance according to the present invention.
  • FIG. 14 shows a shunt plate for an electric motor according to the present invention.
  • FIG. 15 shows an example of a wheel-and-rim-type hub motor according to the present invention.
  • FIG. 16 shows an example of a high density standard configuration motor according to the present invention.
  • FIG. 17 shows an example of a motor with an epicyclic gear set according to the present invention.
  • FIG. 18 shows an example of a high density transmission motor according to the present invention.
  • FIG. 19 shows an example of a standard motor rotor according to the present invention.
  • FIG. 20 shows another example of a standard motor rotor according to the present invention.
  • FIG. 21 shows an example of a stator of a motor according to the present invention.
  • FIG. 22 shows the stator of FIG. 21 , with some coil modules omitted for the illustration purpose.
  • FIG. 23 shows another example of a rotor of a huh motor according to the present invention.
  • FIG. 24 shows another example of a rotor of a hub motor according to the present invention.
  • FIG. 25 shows another example of a stator of a huh motor according to the present invention.
  • FIG. 26 shows another example of a stator of a motor according to the present invention, with spokes.
  • FIG. 27 shows a table of the number of phases at a given ratio of magnets to coils.
  • FIGS. 1 and 2 Shown in FIGS. 1 and 2 is a motor 10 that comprises a stator 20 sandwiched between a pair of rotors 50 .
  • FIG. 2 is a partially exploded view of the motor 10 .
  • the motor 10 shown in FIGS. 1 and 2 uses a single rotor-stator-rotor configuration.
  • the stator 20 has one or more arrays of coil 31 .
  • Each of the rotors 50 has one or more arrays of magnets 60 .
  • the design may be scaled to include fewer or more magnets 60 per rotor section 50 or fewer or more coils 31 per stator section 20 .
  • the rotor 50 will contain an array of coils instead of magnets.
  • stator-rotor sections versus stator and rotor thicknesses can be optimized for best performance versus cost as a given application demands. Best performance can he achieved when the thickness of the stator 20 does not exceed the twice the thickness of the magnets 60 in a given rotor 50 . It is possible to use different thicknesses of rotors 50 and stators 20 and different individual thicknesses for any given rotor 50 or stator 20 . It may be optimal to use a thicker rotor 50 at each axial end of the motor 10 .
  • a “stator-rotor section” in a rotary motor (or generator) is defined to be an axially positioned rotor 50 followed by an axially positioned stator 20 followed by an axially positioned rotor 50 .
  • a “stator-rotor stack” is defined to be a rotor 50 followed by a stator 20 followed by a rotor 50 followed by a stator 20 followed by a rotor 50 in a repeating pattern where each end of the stack is preferably a rotor 50 (“end rotor”), preferably configured with a magnetic shunt path 70 on the axially outer ends of the stack.
  • the stator-rotor sections in the stack are counted by the number of stators 20 in the stack.
  • a “stator-rotor section” in a linear motor (or generator) is defined to be linearly positioned and arrayed rotor 50 next to a linearly positioned and arrayed stator 20 followed by a linearly positioned and arrayed rotor 50 , stator 20 being used to describe the stationary component and rotor 50 being used to describe the moving part, although both parts can be configured to move as needed.
  • the rotor 50 or the stator 20 may contain the coils 31 or the magnets 60 as needed.
  • a “stator-rotor stack” in a linear motor is defined to be a rotor 50 positioned next to a stator 20 followed by a rotor 50 positioned next to a stator 20 followed by a rotor 50 in a repeating pattern where each end of the stack is preferably a rotor 50 (“end rotor”), preferably configured with a magnetic shunt path 70 on the axially outer ends of the stack.
  • end rotor preferably configured with a magnetic shunt path 70 on the axially outer ends of the stack.
  • the stator-rotor sections in the stack are counted by the number of stators 20 in the stack.
  • Each of the herein described embodiments may be configured as a motor, a generator, or a part-time motor and generator, or a partial motor and partial generator as determined by the number of coils 31 used as driver coils or generator coils, noting that any one coil 31 may be configured to change as needed from generator to motor operating modes.
  • the stator 20 has a plurality of coil modules 30 .
  • each of the coil modules 30 has a coil 31 .
  • the coil 31 is composed of a pair of windings 32 around a core 34 .
  • the coil module 30 may have a single winding 32 or may have more than two windings 32 .
  • the core 34 is in a non-circular shape. As shown in FIGS. 4 , 5 , 6 , 8 . 9 and 10 , the core 34 can be formed in a circular shape.
  • the winding 32 is preferably made up a wire 33 with a good conductivity, such as copper.
  • the wire 33 is preferably insulated.
  • the wire 33 is flattened and wrapped around the core 34 which is in a circular shape.
  • the using of the flattened wire 33 can help minimize the air gaps, optimize the magnetic flux pattern, and increase the integrity of the winding 32 .
  • the wire 33 may he otherwise non-circular in cross-sectional shape. Still, the wire 33 may be circular in cross-sectional shape as conventional.
  • the coil 31 is made up of two side-by-side windings 32 of flattened wire 33 .
  • the flattened wire 33 is wound continuously from the center side to the outside to form a winding 32 , and then the same wire 33 is again wound from the center side to the outside to form a separate winding 32 so that two windings 32 made up of the single wire 33 are arranged side-by-side on the same core 34 . Because the two windings 32 are made up of the same wire 33 , both ends of the wire 33 are disposed at the outside of the windings 32 .
  • This side-by-side windings can be repeated over and over on the same core 34 in groups of even numbers of windings 32 so that both ends of the wire 33 can always be located either at the center side or at the outside of the windings 32 .
  • the two windings 32 are oriented opposed to each other. The opposed orientation promotes an optimal through-coil magnetic flux creation.
  • the two windings 32 may be oriented in the same direction as shown in FIG. 6 .
  • odd numbers of windings 32 may also be used if the designer desires to have a central wire end and an outer wire end. However, leaving a single wire to cross from the center side to the outside of the windings 32 can distort the induced magnetic flux field and reduce coil performance and efficiency.
  • the coil 31 is made up of a winding 32 of a flattened wire 33 wrapped around a rectangular core 34 .
  • a winding 32 of a flattened wire 33 wrapped around a rectangular core 34 .
  • two or more windings 32 can be arranged side-by-side.
  • the core 34 may he non-circular and non-rectangular.
  • each winding 32 is designed so that it will function as a stand-alone coil, even if included in a parallel or series chain of additional windings,
  • the wire 33 is wound such that the larger flat surface thereof is facing in a direction perpendicular to an axis of the coil 31 .
  • the wire 33 is wound such that the larger flat surface thereof is facing in a direction parallel with the axis of the coil 31 .
  • the individual windings 32 may be bonded together with an appropriate insulator or bonding agent to prevent movement or give the coil 31 an overall structural integrity.
  • the coils 31 may be encapsulated in another material, such as plastic, or may be sandwiched between other thin materials for additional structural integrity.
  • the coil 31 can be made up of a plurality of printed circuit boards 35 .
  • Each of the printed circuit boards 35 has a conductor path 33 a printed therein in a spiral shape about the core 34 so as to form a winding 32 .
  • the plurality of printed circuit boards 35 are layered to form a plurality of windings 32 .
  • the coil 31 may be composed of a single printed circuit board 35 to form a single winding 32 .
  • the printed conductor path 33 a can have circular or other concentric shape, which generally matches the shape of the core 34 , which in turn generally matches the shape of the magnet 60 .
  • the coils 31 may he wrapped around a circular core shape, or as shown in FIGS. 3A , 3 B and 7 the coils 31 may be wrapped around a non-circular shape.
  • the coils 31 are preferably composed of a good conductor such as copper.
  • the windings 32 are preferably composed of insulated wire 33 .
  • the wire 33 may he circular or non-circular in cross-sectional shape.
  • a flattened wire is particularly effective.
  • the windings 32 may be made up of multiple layered circuit boards 35 with circular, spiral, or other concentric shapes which generally match the shape of the core 34 , which generally matches the shape of the magnet 60 .
  • the cross-sectional shape of the core 34 is preferably similar to or exactly the same with the normal, or facing, cross-sectional shape of the magnets 60 of the rotor 50 .
  • the cross-sectional size of the core 34 is also preferably similar to or the same with the normal, or facing, cross-sectional size of the magnets 60 . This core design allows for maximum focus of the magnetic flux perpendicular toward the magnets 60 of the rotor 50 while minimizing any resistance (and therefore loss) to the flux.
  • the stator 20 is composed of an array of coils 31 .
  • Three stator categories are used: an integrated stator where the coils 31 and stator 20 are bonded together as a single unit or module, a partially integrated stator where some of the coils 31 are bonded together as a single unit or module, and a unitized stator where individual coils 31 are separately used whether exposed or encapsulated for ease of individual coil replacement for a completely modular design with a single coil 31 as the basic unit of the modular design.
  • Multiple stators 20 can be linked together using axially aligned support structures and coil modules 30 or groups of coils 31 can be linked in the axial direction.
  • Individual coils 31 within the stator 20 may he wired in parallel or series or in parallel/series combinations as needed for optimal use of the available current and voltage from an available power source.
  • the electronics interfacing with the stator coils 31 can he configured to switch the coils 31 into parallel and series or combinations of parallel and series from stand-alone, series, parallel, or parallel/series combinations as needed on demand.
  • the cores 34 used in the present invention can he made in multiple configurations and from multiple materials.
  • the core 34 can be made up of a series of small gauge wires 34 a, which are preferably hard steel wires of a very small diameter.
  • the distance between the gauge wires 34 a is preferably less than the diameter of the gauge wire 34 a for a better performance.
  • Optimal spacing is obtained when each gauge wire 34 a is spaced from the adjacent one by the same spacing distance as is equal to the diameter of the gauge wire 34 a.
  • a variety of spacing distances between the individual gauge wires 34 a may also be possible. Wider spacing could be appropriate for higher RPM, lower efficiency designs.
  • the gauge wires 34 a can be oriented for optional directional focusing effect of the magnetic flux through the coil 31 .
  • the care 34 is made up of thin steel 34 b with one or more small breaks or slits 34 c.
  • the thin steel 34 b can be hard steel with a width of a few thousands of an inch.
  • the orientation of the thin steel 34 b and the slits 34 c can be selected for optional directional focusing effect of the magnetic flux through the coil 31 .
  • the slits 34 c prevent the magnetic flux from inducing a current which travels around the core 34 .
  • the core 34 has a first pole face 36 , a second pole face 37 , and a middle portion 38 between the first and second pole faces 36 , 37 along a center axis 2 .
  • the middle portion 38 has a reduced width than the first and second pole faces 36 , 37 . This configuration maintains the width of core at the pole faces 36 , 37 while increasing the winding area and the number of turns in the middle portion 38 . Accordingly, the flux is increased at the pole faces.
  • the core 34 of the present invention preferably uses little or no iron. In the case where a little iron is used, it is preferable to use hard steel as little as possible to focus the lines of force as needed. However, soft iron may also be used with some loss of efficiency.
  • the present invention has been tested with small gauge piano wire, very thin, axially segmented shim material, tubes, and solid shapes. In conventional motors, iron cores are used to transmit the flux from where it is created from the copper windings to where it is needed to he used at the rotor/stator interface area. In the present invention, the flux does not need to be transmitted from a point of creation to a point of use because the flux is created right where it is needed to be used.
  • a designer can use no core material at all (perhaps a non-ferrous core for coil winding purposes which may or may not be removed after winding), a soft iron-tube, or a thin layer of iron filings encased in a hinder, ideally subjected to a magnetic field prior to the binder setting up.
  • the present invention also contemplates less efficient core designs, for which there are a variety of reasons to consider including manufacturing costs, reduction of electrical spike kick-back through the power circuits.
  • Rotors 50 are designed with one or more arrays of magnets 60 contained within the rotor 50 .
  • FIGS. 12A through 12D show variants of the magnet 60 .
  • the magnet 60 has an inner end 61 to be disposed close to the central axis 1 of the motor 10 and an outer end 62 to be disposed away from the central axis 1 of the motor 10 .
  • the magnet 60 also has a top surface 63 and a bottom surface 64 . When the magnet 60 is mounted in the rotor 50 , the top surface 63 faces toward the stator 20 . In other words, the top surface 63 functions as a pole end.
  • the magnet 60 has two pie-shaped steps 63 a formed adjacent the top pole face 63 on both sides thereof so that the top pole face 63 is narrower at the inner end 61 than at the outer end 62 .
  • the embodiment illustrated in FIG. 12B is different from that of FIG. 12A in that the magnet 60 further has two pie-shaped steps 64 a formed in the bottom pole face 64 on both sides thereof so that the bottom pole face 64 is also narrower at the inner end 61 than at the outer end 62 .
  • the embodiment illustrated in FIG. 12C is different from that of FIG. 12B in that the magnet 60 is made up of two halves 60 a and 60 b stacked one on top of the other.
  • the two haves 60 a and 60 b attract each other and help hold each other in place in the rotor 50 .
  • the top pole face 63 and the bottom pole face 64 are narrower at the inner end 61 than at the outer end 62 .
  • the purpose of the above configurations is to focus the lines of magnetic force or the magnetic flux.
  • the magnet 60 is a good flux conductor.
  • the wide portion of the magnet 60 disposed between the two pole faces 63 and 64 creates more lines of force.
  • the narrow magnet or magnet material on the top surface and/or bottom surfaces 63 and 64 , at the poles, causes the lines of force to constrict and focus to a higher concentration at the narrower pole surface(s).
  • the stepped configuration as illustrated in FIGS. 12A reduces the area of the top surface 63 or pole face than other portion of the magnet 60 . Accordingly, this configuration helps concentrate the magnetic fields and increase the field strength at the narrowed top surface 63 functioning as a pole end. Therefore, the configuration of FIG. 12A is preferable, when the magnet 60 is embodied in an end rotor disposed at the outermost end, with a stator on one side only.
  • the stepped configuration as illustrated in FIGS. 12B and 12C or the angled configuration as illustrated in FIG. 12D reduces both the areas of the top pole face 63 and the bottom pole face 64 than other portion of the magnet 60 . Accordingly, this configuration helps concentrate the magnetic fields and increase the field strength at the narrowed bottom surface 64 as well as at the narrowed top surface 63 , both functioning as pole ends. Therefore, the configurations of FIG. 12B through 12D are preferable when the magnet 60 is embodied in a middle rotor interposed between stators.
  • the optimal magnet shape is the pole area being narrower than the middle portion.
  • the magnet 60 need not be solid a magnet.
  • the magnet 60 can be built from any number of smaller or thinner magnet pieces stacked so as to make the composite final shape.
  • the stepped or angled configuration can be obtained by machining the magnet 60 or by casting. The casting process is preferred.
  • the magnets 60 may be of any shape, but preferably have two parallel, flat surfaces (pole faces) that face the stator 20 .
  • the polarities of the magnets 60 are preferably north-south-north-south in alternating configurations. This translates to a preferred design using always an even number of magnets 60 .
  • the preferred spacing is to use the width of the closest point between magnets 60 as equal to the width of the widest part of the magnets 60 , though closer and farther configurations also work with varying efficiencies.
  • Convenient magnet shapes include cylinders or discs, prismatic squares or rectangles, and prismatic pie-shapes truncated with inner and outer arcs.
  • FIG. 13 best shows preferred design rules for optimal performance.
  • the magnet 60 has a width W, a length L, and a height HM.
  • the length L is a dimension of the magnet 60 measured between the pole faces 63 and 64 .
  • the core 34 has a width C, a length LC, and a height HC.
  • the length B is a dimension of the core 34 measured between the pole faces 36 and 37 .
  • a magnet interval as measured between adjacent magnets 60 arranged in the same rotor 50 is denoted as A.
  • a magnet gap between magnets 60 arranged in adjacent rotors 50 as measured along the direction of the axis 2 is denoted as B.
  • the shunt plate has a thickness H.
  • LC is preferably as close to B as possible so that a gap between the coil 31 and the magnet 60 measured along the direction of the axis 2 can be as small as possible.
  • H should be large enough to transfer substantial flux from coil to coil. Any violation of above rules results in loss of efficiency, but not necessarily non-functionality.
  • magnets 60 are oriented opposite to each other (north facing south and south facing north) along an axial parallel. Magnets 60 on one rotor 50 are aligned with magnets 60 on the next rotor 50 in this fashion. On a single rotor 50 around the circle that includes the center of each magnet 60 magnets 60 are arrayed opposite to each other, as also seen FIG. 14 .
  • magnets 60 are oriented with the polarized surfaces (pole faces) aligned normal to the rotor axis.
  • the magnets 60 can be aligned along a radial. This alternative embodiment may require a second concentric array of coils 31 , the first coil array centers aligned with the outer ends of the magnets 60 and the second coil array centers aligned with the inner ends of the magnets 60 .
  • the magnets 60 can he oriented along the direction of the circle described by the centers of the magnets 60 , facing north to north or north to south repetitively around the circle.
  • magnets 60 can be oriented facing each other (north facing north and south facing south).
  • the coil design has to be altered for optimal performance to reverse the winding direction at the center of the coil axis as shown in FIG. 6 .
  • FIG. 14 In FIG. 14 is shown a shunt plate 70 .
  • the shunt plate is used to provide a flux conduction path from one magnet 60 to the next magnet 60 . Half of the flux is conducted to the right of each magnet 60 and half to the left of each magnet 60 in FIG. 14 .
  • the shunt plate 70 is used on each end of the stator/rotor stack. Additional shunt plates 70 can be used every so many stator/rotor groups as needed.
  • the shunt plate 70 can be made of one contiguous piece of material or of separate pieces of material as needed, although a single contiguous piece is preferred.
  • FIG. 15 shows an example of the motor 10 according to the present invention, which is embodied a wheel-and-rim-type hub motor.
  • the motor 10 contains a rim 11 , two shunt plates on either end of the stator/rotor stack, a number of stators and rotors, each with rectangular coils 31 and magnets 60 in radial arrays, bearings, shafts, and other support components as necessary.
  • This particular design illustrated in FIG. 15 is not modular, except in the sense that each part of the stator/rotor stack can be viewed as a module, however, the design can be implemented with modular components as with all of the high density designs shown.
  • the shunt plate 70 is composed on a material that is able to conduct the magnetic flux.
  • the flux from the rotor magnets 60 is able to close the magnetic flux loop through the shunt plate 70 , allowing the flux loop to pass from a south pole to the next north pole to the next south pole, etc as best seen in FIG. 14 .
  • the motor 10 can be constructed without one or both shunt plates 70 , but performance is negatively affected without the presence of shunt paths 70 .
  • the primary design constraint for optimal shunt plate performance is a cross-sectional area equal to half the cross-sectional area of one of the magnets 60 .
  • the shunt plate 70 can be slotted or made up of discrete segments. Each slot or segment interface is aligned exactly half way between the magnets 60 .
  • the slot or interface makes a convenient sharp change of magnet lines of force which can be used with magnetic sensors, such as Hall Effect devices, to tell the motor controllers when to switch the pulses to the coil 31 from +/ ⁇ to ⁇ /+ between the two coil wires.
  • the same signal can be used as the basis of a start point for a timed delay for the switching of the +/ ⁇ to ⁇ /+ between the two coil wires, assuming that a timing delay (or advance) is desired.
  • FIG. 16 shows an example of the motor 10 according to the present invention, which is embodied as a high density standard motor.
  • a “standard motor” is defined to he a motor with a stationary stator and rotating rotor or stationary group of stators and rotating group of rotators configured in a stator/rotor stack.
  • the standard motor uses the elements described above: stator(s), rotor(s), coils, permanent magnets, position sensors, coil energizing circuits and/or rectification circuits and design considerations as previously enumerated.
  • the rotors 50 contain rectangular magnets 60
  • the stators 20 contain rectangular coils 31 and cores 34 (hidden in the stack).
  • the stators 20 are stationary and the rotors 50 turn to drive the central shaft 1 .
  • FIGS. 17 and 18 show examples of the motor 10 according to the present invention, which is embodied with an epicyclic gear set 80 .
  • the configuration of the epicyclic gear set 80 is better seen in FIG. 18 .
  • the rotors 50 can be set concentrically outside of the ring gear 82 or side-by-side with the ring gear 82 .
  • the method of attachment can vary and the rotor can be indirectly or directly attached to the ring gear 82 , either next to or outside of the ring gear 82 .
  • an input shaft of the motor 10 drives a sun gear 81
  • a ring gear 82 is driven by motor rotors 50
  • the planet gear carrier 84 drives an output shall.
  • the motor 10 optionally uses a clutch or other locking device to limit or lock the motion of the ring gear 82 (or attached rotor 50 ) relative to the motor housing (not shown).
  • the rotor 50 is driven by energy input from the stator 20 such that the speed of the ring gear 82 can be controlled relative to or different than the speed of the input shaft, resulting in an ability to alter the gearing ratio relative to the output shaft.
  • This gear ratio based on energy added to the ring gear 82 from the driven rotor 50 . results in a variable input to output shaft speed infinitely variable ratio from 1:1 to the ratio of the epicyclic gear set 80 .
  • the electric variable transmission adds torque through one or more stator/rotor sections.
  • FIG. 17 three rotors 50 drive two stators 20 around the central epicyclic gear set 80 .
  • the two stators 20 would contain 24 encapsulated coil modules 30 each, however, only one encapsulated coil module 30 per stator is shown.
  • each rotor 50 can be 1.5 inches thick and each stator/rotor section is 3 inches thick, including the 1.5 inch thick rotor 50 while in FIG. 18 each stator/rotor section can be 0.76 inches thick.
  • other thicknesses larger or smaller may be used, depending on the desired performance.
  • FIG. 19 shows an example of the rotor 50 of the motor 10 according to the present invention, which is embodied as a standard motor rotor.
  • the rotor 50 has 40 magnet holes 52 evenly spaced near the outer periphery of the rotor 50 .
  • the rotor 50 is shown with a center hole 54 in the center of the rotor 50 as might be used in a transmission application. In a non-transmission standard motor application the center hole 54 could be much smaller than shown, as necessary to attach to either a shaft, a shaft collar, or other shall attachment system.
  • the rotor 50 can be designed with any even number of magnet holes 52 , each of which should be of a similar shape in a radial array.
  • the magnets 60 can be round, square, pie shaped, rectangular, or any other convenient shape, however, the truncated pie shape as best seen in FIG. 2 is preferred.
  • FIG. 20 shows another example of the rotor 50 of the motor 10 according to the present invention, which is embodied as a standard motor rotor.
  • the rotor 50 has a circular pocket 56 for receiving the shunt plate 70 (not shown in FIG. 20 ), which increases motor efficiency by providing a magnetic flux conduction path for each magnet 60 to conduct half of its flux to the next magnet 60 in the radial array on either side.
  • the rotor 50 on each end of the stator/rotor stack is preferably configured with the circular pocket 56 for the shunt plate 70 , which should be designed with a magnetically conductive material.
  • FIGS. 21 and 22 show an example of the stator 20 of the motor 10 according to the present invention.
  • FIG. 21 there are two stators 20 , each composed of a radial array of encapsulated coil modules 30 and support arms 22 as might be used in a modular design.
  • Each radial array of encapsulated coil modules 30 represents a stator section.
  • FIG. 22 some of the encapsulated coil modules 30 in one of the two stators 20 are omitted for the illustration purpose.
  • FIG. 23 shows another example of the rotor 50 of the motor 10 according to the present invention, which is embodied as a huh motor.
  • the rotor 50 of the huh motor 10 is shown such as would he used in an automotive type application.
  • FIG. 24 shows another example of the rotor 50 of the motor 10 according to the present invention, which is also embodied as a huh motor.
  • the rotor 50 of the huh motor 10 is shown as a sprocket rotor with teeth 58 .
  • the rotor 50 shows magnet holes 52 for rectangular magnets 60 (not shown).
  • the extra half circles 52 a in the four corners of each magnet hole 52 are used for convenience in a particular manufacturing process, but these half circles 52 a are not necessary for the design to be functional.
  • the rotor 50 shows a shunt pocket 56 for the shunt plate 70 (not shown).
  • FIG. 25 shows another example of the stator 20 of the motor 10 according to the present invention, which is embodied as a hub motor.
  • internal rectangular holes 24 for receiving coil modules 30 are shown for illustration.
  • FIG. 26 shows another example of the stator 20 of the motor 10 according to the present invention.
  • the stator 20 has spokes 21 .
  • the extra holes 23 are to reduce weight.
  • a circuit that controls the timing of the pulses switches for fires) the pulses at the right orientation of the coil 31 relative to the magnet 60 for optimal motor performance.
  • the timing of the switching may be controlled in a variety of ways, including but not limited to brushes, sensing of the magnet position through one or more coils, the use of a Hall effect device, or optical sensors.
  • the coil 31 may push or pull the magnets 60 with a net force opposite to the desired direction of motion of the motor 10 . This reduces performance and wastes power. The same is true is the timing is retarded too far.
  • the regenerative motor according to the present invention can be designed with a variety of phases. Each phase can utilize independent timing of electrical pulses. Typically, a series of coils are located such that the first coil 31 fires, then the second, then the third, etc. until 3 coils 31 have fired in a 3-phase motor or 4 coils 31 have fired in a 4-phase motor, etc. Once the number of coils 31 matching the number of phases of the motor 10 has been reached, the next coils 31 in the series are fired at the same time as the individual coils 31 correspond to the first coils 31 in the repeating series. For example, in a 3-phase motor with 9 coils, coils 1 , 4 , 7 fire first, the coils 2 , 5 , 8 fire, and finally coils 3 , 6 , 9 fire, after which the process repeats.
  • the number of phases is determined in the design process by determining or selecting the number of magnets 60 and coils 31 .
  • the angles between the magnets 60 and coils 31 are used determine the number of phases.
  • Charts or tables can be developed to simplify the process, such as the chart shown in FIG. 27 .
  • FIG. 27 shows a table of the number of phases at a given ratio of magnets 60 to coils 31 . This table can he used as a look up table to determine the number of phases that a given motor or generator design will have at a given ratio.
  • each coil 31 interacts with 4 magnets 60 at a time, two on either side of the coil as can be seen FIG. 13 (as long as there is an opposing rotor 50 on each side of the coil 31 —in embodiments where a coil 31 does not have a rotor 50 on both sides the coil 31 interacts with half the number of magnets 60 at a time).
  • an individual coil can interact with a greater number of magnets 60 .
  • the present invention can be embodied in various types of motors as further explained below.
  • a standard motor is a motor with a stationary stator and rotating rotor or stationary group of stators and rotating group of groups configured in a stator-rotor stack.
  • the standard motor uses the elements described above: stator(s), rotor(s), coils, permanent magnets, position sensors, coil energizing circuits and/or rectification circuits and design considerations as previous enumerated.
  • a regenerative motor can be modified to include an epicyclic gear set with the input shaft of the motor driving the sun gear, the ring gear driven by motor rotors, and the planet gear carrier driving the output shaft.
  • the motor optionally uses a clutch or other locking device to limit or lock the motion of the ring gear or attached rotor) relative to the motor housing.
  • the rotors can be set concentrically outside of the ring gear or side-by-side with the ring gear.
  • the method of attachment can vary and the rotor can be indirectly or directly attached to the ring gear, either next to or outside of the ring gear.
  • variable electrical transmission uses the elements described above: stator(s), rotor(s), coils, permanent magnets, position sensors, coil energizing circuits and/or rectification circuits and design considerations as previous enumerated.
  • the preferred embodiments are intended for automotive or powersports applications.
  • the hub motor is attached to the bolt studs that typically protrude through the brake rotor.
  • the hub motor can rotate relative to the spindle, faster or slower, as needed.
  • the torque from the motor is generated as one or more rotors which contain an array of alternating north-south magnets are subjected to alternating push-pull forces generated in a stator composed of multiple flat coils.
  • these elements are combined for the purpose of capturing energy in a regenerative or generator-based fashion from either a braking action or intentional generative action from higher relative spindle speeds to motor speeds and storing the captured energy in an internal storage device, which energy can subsequently be used to supplement or replace energy from the spindle for rapid and more efficient acceleration or cruising (within the limitations of the energy storage device).
  • the motor controller electronics and some minimal energy storage are contained inside the motor. Control signals can either be transferred by remote control or through the spindle.
  • the motor can accept power and control signals through the spindle or through slip rings or discs or use a remote control device for communicating drive signals.
  • the hub motor has one or more locking devices which can prevent or limit the relative rotation of the hub motor which respect to the spindle.
  • the locking device would take the form of an overriding slip clutch, a multiple disc clutch, or a solenoid/detest mechanism.
  • the ability of the huh motor to turn at speeds relative to the input spindle or shaft allows the driven wheel to turn at relative speeds to the motor input shaft, allowing the huh motor to add power to the input shaft or take power from the input shaft. This allows the motor to act in a drive mode, a regeneration charging mode, or as in a controlled slip mode.
  • Embodiment 4 is the same as Embodiment 3 except that in this embodiment the spindle or shaft is stationary.
  • the hub motor rotor turns around the stationary shaft.
  • This embodiment allows power and control signal wires to be passed through the spindle (including a hollow spindle, a solid spindle with multiple insulated electrical pathways, or a slot in the spindle).
  • the motor control electronics and/or power source can be located inside of the hub motor or outside of the hub motor.
  • the center area of the hub motor contains an epicycle gear system.
  • the input spindle of the motor connects to the sun gear of the gear system.
  • the motor rotors connect to the ring gear of the gear system.
  • the planetary gear carrier connects to the rotating housing of the hub motor, which in turn drives the tire, roller, sprocket, outer gear teeth, etc.
  • a locking mechanism to lock the gear system so that the input shaft directly turns the wheel, sprocket, etc.
  • the locking system may be composed of an overriding slip clutch, a disc clutch, a solenoid/detent mechanism, etc.
  • the presence of the epicyclic gear system allows the driven wheel to turn at relative speeds to the motor input shaft, allowing the hub motor to add power to the input shall or take power from the input shaft. This allows the motor to act in a drive mode, a regeneration charging mode, or as in a controlled slip mode.
  • the presence of the gear system in this embodiment allows a definite torque increase from the input shaft to the driven wheel, which may be especially useful in uphill or starting from rest situations.
  • a linear motor embodiment contains the following elements: 1) a linear rotor containing a one or more linear arrays of magnets or coils, 2) a linear stator containing one or more linear arrays of coils, 3) a method of sensing coil relative to magnet position as described previously for driven coils (left out in a linear generator embodiment), 4) a method of constraining or limiting the path of motion, which may include some form of linear bearing or bushing arrangement that allows the rotor and stator to move relative to each other in a predefined path, 5) optionally a travel limiting system (springs, hard stops, elastomeric bumpers, magnets, dampers, or combinations of these items), and 6) optionally a clutching or braking system.
  • a linear positioning motor embodiment is obtained when a linear motor as described in Embodiment 6 is combined with an absolute or incremental position encoder of any type (optical, magnetic, etc.) and a closed-loop feedback system.
  • the linear positioning motor does not experience magnetic pull from rotor to stator when the coils are not energized. This means that the motor does not have a tendency to snap into a position other than the last relative position of the stator(s) and rotor(s) where the motor last came to a rest (unless there are external forces).
  • the closed loop feedback system detects any stall of motion from the last rest position, it can energize the coils to reposition and hold the motor at the original position.
  • a pancake motor is defined to be a thin motor (or generator) where the motor diameter is larger than the motor thickness.
  • a pancake motor embodiment of the Regenerative Motor and Coil Design is identical to the standard motor design with the limitation of the diameter to width envelope dimensional proportions. The Regenerative Motor and Coil Design is particularly suited to pancake motor applications due to the thin stator/rotor sections upon which the invention is based.
  • a rotary positioning motor embodiment is obtained any time any of the rotary motor embodiments described herein are utilized with an absolute or incremental positioning sensor of any type (optical, magnetic, etc.) and combined with a closed-loop feedback system.
  • the rotary positioning motor does not experience magnetic pull from rotor to stator when the coils are not energized. This means that the motor does not have a tendency to snap into a position other than the last relative position of the stator(s) and rotor(s) where the motor last came to a rest (unless there are external threes).
  • the closed loop feedback system detects any start of motion from the last rest position, it can energize the coils to reposition and hold the motor at the original position.
  • a cup motor embodiment can be designed 1) using the radially aligned magnet/coil or coil/coil stator/rotor elements as described above or 2) stator/rotor sections that use a hollow center section.
  • the coils and cores described herein can exist in a variety of configurations.
  • the coils are encapsulated within another material whether within one or more thin sheets of material or fully encapsulated in a polymer or other encapsulating material: in the encapsulated embodiment, the encapsulated coil modules can optionally include electrical control system for energizing the coil based on a timing signal or count, or for rectifying generated power, or with both an energizing circuit and a rectifying circuit with circuit path switching as applicable.
  • best performance is generated if energy is input into the coil for part of a duty cycle and then extracted from the coil during another part of the duty cycle. This is useful if a designer desires to input energy to create the field and then capture energy from the collapsing fields to increase efficiency, similar to the way that a compressed spring stores potential energy which can subsequently released.
  • Magnetic modules can exist with one or more coils in stand-alone units or as part Of a larger assembly. Magnetic modules can be fractions of a stator or the entire stator. Magnetic modules can include coils or coils and electronics to control or derive power from coils.
  • linear motor can he readily extrapolated to a propulsion system for a variety of track-based electric vehicles.
  • One embodiment uses alternating permanent magnets in a track and coils on a vehicle using the linear push-pull rotor/stator interactions described above.
  • Another embodiment uses permanent magnets on the vehicle and coils in the tracks.
  • Linear Propulsion Motor can be further extrapolated to launch vehicles or objects from a track as a projectile.
  • Projectile based embodiments can utilize the coil design described herein in two-dimensional or three-dimensional coil arrays configured around a tube in one or more linear arrays around permanent magnet or induced magnetic projectiles.
  • the coils and magnets are configured to operate as a solenoid.
  • the coil is energized to move the magnet.
  • the coil can be re-energized or de-energized (in the presence of gravity, a spring, compressed gas, or other return motion system) to return the solenoid to the initial position.
  • coil energizing or power harvesting circuits can be included within the motors or be included separate from the motors and wired to the coils inside of the motor. It is frequently convenient to include the electronics within the center of a hub motor or integrated into the magnetic modules of a standard motor, transmission motor, or similar.
  • All of the embodiments described herein can also optionally be configured with the coil energizing circuits, coil energy harvesting circuits, part-time energizing/harvesting circuits, or on-demand energizing/harvesting switching circuits.
  • the designer can optionally choose to make the design modular or non-Modular.
  • one or more of the coils can be made as a self-contained module. This modular design facilitates assembly and maintenance such that if a coil module fails, it can be replaced with minimal disassembly of the motor—in some cases without even stopping the motor. It is also conceivable to make entire coil stator section as a module for easy replacement, though it might be advisable to allow the stator to at least be divisible into two sections to minimize disassembly. While rotors can also be divisible into discrete module sections as a contemplated embodiment or alteration to the embodiments, the advantages to doing so are less clear.
  • the present invention can be further embodied in various types of motors as further explained below.
  • This embodiment is similar to the cup motor without the hollow center section.
  • stators and rotors can he configured as described in embodiments above but with one or more additional concentric arrays of magnets and coils in rotors and stators. Coils and magnets can be radially aligned or staggered from concentric array to concentric array.
  • This embodiment is similar to the Alternate Embodiment 2 for rotary motors, aligned or staggered linear arrays of magnets and coils can be used in linear rotors and stators for additional performance.
  • This embodiment is similar to Alternate Embodiment 2, except that one or more of the stator/rotor sections can be configured in axial orientations and, within the same device, one or more stator/rotor sections can be configured in the radial orientation, possibly in an alternating configuration.

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  • Permanent Magnet Type Synchronous Machine (AREA)
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US20120326541A1 (en) 2012-12-27
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