WO2003000017A9 - Variable reluctance motor - Google Patents
Variable reluctance motorInfo
- Publication number
- WO2003000017A9 WO2003000017A9 PCT/US2002/020072 US0220072W WO03000017A9 WO 2003000017 A9 WO2003000017 A9 WO 2003000017A9 US 0220072 W US0220072 W US 0220072W WO 03000017 A9 WO03000017 A9 WO 03000017A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- motor
- core
- module
- units
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
- H02K19/10—Synchronous motors for multi-phase current
- H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/15—Sectional machines
Definitions
- the present invention relates to a variable reluctance motor. More
- the present invention relates to a variable reluctance motor in which a
- Variable reluctance motors are used as direct drive motors for
- These motors can include phase assemblies and ferromagnetic cores, sometimes referred to as stators, that control the movement of tools such as robotic arms and placement heads along the X-axis and the Y-axis.
- stators ferromagnetic cores
- each phase assembly and its core move relative to each other via
- the flux is generated in phase units of each phase assembly
- variable reluctance motors such as that described in U.S. Patent
- the windings and stator are each formed by securing a stack of members, such as laminations, together along adjoining faces.
- windings are formed on stacked core members that include a plurality of legs that
- Each leg and stator includes flux delivering teeth that extend along a
- each leg longitudinal or toothed surface.
- the teeth of each leg are intended to deliver the
- Each wrapped coil extends away from its leg in the direction of an
- Each wrapped coil generates an electromagnetic flux when it
- the cores are spaced a significant distance away from each other by a low reluctance material such as plastic. As a result, the flux generated in the coil
- each leg is confined to its respective U-shaped core. While this arrangement may prevent flux from leaking between adjacent cores, it significantly
- Adjacent cores must be separated by a distance
- the location and positioning of these cores are predefined and fixed based
- U.S. Patent No. 6,078,114 to Bessette et al. also discloses a variable reluctance linear motor. Like other prior art variable reluctance motors,
- the motor disclosed by Bessette et al. includes a stator and a phase assembly that
- the phase assembly includes a plurality of assemblies
- E-cores E-shaped cores
- electromagnetic flux generating coils are wrapped about the legs of the E-cores.
- the cores of this motor must also be sufficiently spaced from each other so
- stator between the stator and the E-cores.
- the support bearings contact and travel along tlie side surfaces of the stator as the assemblies move relative to the stator in order
- Each support bearing is secured to a shaft that is received in a hole at the end of a cantilevered
- stator at a high frequency, thereby causing unwanted hysteresis, rippled movement and unnecessarily inefficient motor operation.
- variable reluctance In one embodiment of the present invention, a variable reluctance
- phase assembly comprising more than one phase unit, each of said phase units comprising at least one module, each said module comprising an electrically conductive coil wound around the module in one or more windings, each of said phase units being magnetically isolated from every other phase unit,
- each of said phase units defining a flux path; and a ferromagnetic core within said
- Another embodiment of the present invention includes a variable
- each of the phase units comprises a C-shaped core having two legs and a center
- Another embodiment of the present invention relates to a method of
- variable reluctance motor having at least first and second adjacent
- phase units wherein the first phase unit includes at least one leg through which a
- the second phase unit includes at least one leg through which a second magnetic flux passes during operation of the motor, and the at least one leg of the first phase unit is adjacent to
- the method comprises supplying
- phase units being arranged such that the magnetic flux passes through the leg of the first phase unit in a same
- Yet another embodiment of the present invention relates to a module
- the module comprises a C-shaped core having a
- the guide having a first section facing the first direction and a second section
- the first section being narrower than the
- FIG. 1 is a schematic view of a modular variable reluctance motor
- phase assembly including a phase assembly according to the present invention.
- Fig. 2 is a partial exploded isometric view of the phase assembly shown in Fig. 1.
- Fig. 3 is a cross sectional view of a phase unit of Fig. 1, with a
- Fig. 4 is a perspective view of a module of a phase unit of the motor according to the present invention.
- Fig. 5 is a view of a bobbin used in the module of Fig. 4.
- Fig. 6 is a perspectivec view of the stator shown in Fig. 1.
- Fig. 7A is a diagram of flux paths through three phase units and a stator according to an embodiment of the present invention.
- Fig. 7B is a diagram of flux paths through three phase units and a
- Fig. 8 is a schematic view of a rotary embodiment of the present invention.
- Fig. 9 is a schematic diagram of a core used in the embodiment of
- Fig. 10 is a schematic cut-away view of a portion of the rotary motor system embodiment of Fig. 8.
- FIG. 11 is a perspective view of the rotary motor system
- Fig. 12 is a perspective view of a module of the rotary motor system embodiment of Fig.8.
- Fig. 13 is a plan view of the module of Fig. 12.
- Fig. 14 is an exploded view of an embodiment of rotary motor system of Fig. 8.
- Fig. 1 illustrates a linear variable reluctance motor 100 that
- the motor operates with improved accuracy
- motor 100 does not experience the levels of hysteresis loss and heat buildup found in prior art motors.
- the linear variable reluctance motor 100 is used
- the present invention is not limited to linear variable reluctance motors. Instead, the present invention is applicable to rotary as well as
- linear variable reluctance motors In another embodiment, the motor operates as a
- a phase assembly 102 is configured to move along the longitudinal axis of the stator 101
- stator 101 slides within the phase assembly 102 while the position of the phase assembly 102 is
- Phase assembly 102 moves relative to the stator 101 in response to the application of a generated force, such as an electromagnetic flux, as illustrated
- stator 101 is fixed in position and the phase
- a first phase assembly moves relative to a first stator in a
- phase assembly 102 in a direction that extends parallel to the Y-axis.
- Translational movement of the phase assembly 102 along its stator 101 is controlled by selectively applying electrical current to one or more phase units.
- each phase assembly 102 comprises stator guide bearings 112, housing plates 104 and 105, pre-formed bosses 110 with wells 111, and end pieces 106.
- Each phase assembly 102 also comprises at least
- the motor 100 includes
- phase units 121-123 are
- phase assembly is chosen according to the power requirements of motor 100. The greater the required power the more phase units are installed in a phase assembly.
- phase units are preferably substantially identical, assembly of a variety
- phase assemblies having different power capabilities can be achieved by
- phase units 121-123 are
- modular phase units As defined herein, “modular” means comprising removable
- phase units 121-123 are replaceable sections (modules).
- the phase units 121-123 are replaceable sections (modules).
- Each phase unit 121-123 comprises two opposing paired modules 131, 132; 205, 202; 206, 203, respectively.
- the modules of each phase unit face each other from opposite sides
- the modules are substantially identical, spaced apart and
- phase unit 121 comprises modules 131 and 132 that face each other across stator 101.
- phase unit 122 that comprises modules 205 and 202, and
- phase unit 123 that comprises modules 206 and 203.
- example module 131 is shown in Fig. 4. The description of this one module 131 is equally applicable to the other modules of the present invention.
- 131 comprises a core 201 and a pair of shafts 282 and 283, as shown in Figs. 1 and 4.
- Core 201 comprises a stack of laminations 250.
- the core 201 is formed of silicon iron.
- Other embodiments include cores formed of other ferromagnetic materials known to those in the motor
- the module 131 includes a bobbin 199 that is formed of a nonconductive
- Module 131 further includes a wire coil 140 comprising at least one winding positioned around the core 201.
- the wire coil 140 is
- the core 201 is substantially C-shaped, and the laminations 250 are
- each core 201 includes a pair of legs 301, 302 that extend from a center section 305 in the direction of the stator 101 when the motor 100 is assembled.
- Each leg 301, 302 is referred to herein as C-core laminations 250.
- Each tooth 150 includes an outer longitudinal flux surface 303.
- the surfaces 303 are separated from each other by corresponding grooves 160.
- the grooves 160 not only separate adjacent surfaces
- the shape of the grooves 160 also defines the shape of each tooth 150.
- the shape of the grooves 160 also defines the shape of each tooth 150.
- core 201 includes rows of teeth 150 separated by rows of
- each module is fabricated using
- the material is silicon iron.
- Another suitable material is a cobalt-
- iron alloy for example, HIPERCO ® available from CARPENTER ® .
- Adjacent stacked core laminations 250 are fixed together to prevent
- each stacked C-core lamination 250 is
- EP19 HT-FL(SP) 85-15 Flexiblize Mix
- the C-core laminations 250 are then submerged in a bonding epoxy (adhesive) within an impregnation fixture.
- the fixture cover is then closed and the
- vacuum pressure level reaches about 25 inches of mercury.
- the curing fixture is placed in an oven, preheated to about 300 degrees, then is ramped to about 375 degrees for about 1-hour
- a module of the phase assemblies that moves relative to
- stator 101 includes about one hundred-ninety to about two hundred-fifty secured laminations 250.
- core 201 includes about two
- core laminations 250 in a module moving along the x-axis has two-thirds the total
- Wire coil 140 is formed by winding a wire at least one time, i.e., at least one turn, around the bobbin 199 at the center of module 131. Wire coil 140
- bobbin 199 also depicted in Fig. 5,
- the wound coil 140 is positioned by bobbin 199 in a generally fan shape. This fan shape is advantageous in directing the flow of electromagnetic flux through the legs 301
- the fan shape also spreads the
- the fan shape results in the formation of only a few, e.g., one or two, windings on an outer
- the preferred embodiment permits more modules to be positioned in the
- the bobbin 199 has a fan-like shape and is positioned about the center 305 of the core 201 of C-core laminations 250. From the view shown in these figures, the bobbin 199 has a substantially V-shape
- first and second sidewalls 705, 706 respectively spaced on opposite
- the sidewalls 705, 706 form an angle , shown in Fig. 5, that allows the coil 140 to spread out when it is constrained by the bobbin 199.
- the angle ⁇ , created by the sidewalls 705 and 706, is between
- the angle ⁇ is about 30 degrees.
- each sidewall 705, 706 increases in height as it extends toward the stator 101 in order to provide support and guidance to the overlapping portions of the coil 140 at the second surface 720 while the coil 140 is being wrapped during the construction of the motor 100. Moreover, in an embodiment,
- each sidewall 705, 706 includes a hook member for anchoring the bobbin within
- the bobbin is secured to the core 201 using
- the coil 140 also provide better spatial distribution of the individual windings of
- bobbin 199 are spread out over surface 710 so that there are fewer windings per
- the preferred embodiment provides for a more efficient dissipation of
- cooling systems is obviated.
- other suitable arrangements are employed for winding the coil wire in a fan shaped manner.
- the bobbin 199 is formed of a conventional electromagnetic
- the bobbin 199 is made of non-resistance
- the material used to form the bobbin 199 includes liquid crystal polymers. No matter the material used, the bobbin 199 in one embodiment is formed separate of the core 201 and positioned over the core 201 during the
- the bobbin 199 is molded directly on and over the core 201. Additionally, in another embodiment, known
- electromagnetic insulating materials are positioned between the coil 140 and the core 201 in place of the bobbin 199.
- phase modules are located in planes that extend parallel to each other and
- End pieces 106 as
- Fig. 1 are removably attached to the base housing plate 104 and the top
- the end pieces 106 may include oil- saturated felt wipers (not shown) that lubricate rails 401, 402 of the stator for low
- the end pieces 106 support a motion brake sensor of the type described in U.S.
- the housing plates 104 and 105 are provided
- pre-formed bosses 110 having integrally formed wells 111 for receiving and
- shafts 280-291 securely retaining shafts 280-291 extending through and outwardly from the cores 201 of C-core laminations 250 of each module.
- the shafts 280-291 are securely and rigidly received within the bosses 110 so that the shafts 280-291 are not
- the shafts 280-291 receive the
- the life of the motor is increased relative to prior art motors.
- each module is retained by press fitting its
- the shafts 280-291 are made of non-ferromagnetic material.
- Shafts 280-291 are securely fitted through holes 210 in laminations 250 and are
- the shafts 280-291 includes at least one flat edge surface for aiding in the easy and reliable positioning and orientation of the modules within their respective phase
- the removable aspect of the motor 100 includes the plates 104, 105 being designed so that modules can
- phase assembly 102 may be repeatedly added to the phase assembly 102 or removed from the phase
- the press fit improves the tolerance of the phase assembly housing by reducing the accuracy requirements of the cooperating shaft and housing plate. Additionally, the press fit relationship allows for an easy reduction or increase in the number of
- phase units and modules within a phase assembly 102 For example, in an
- one of the three phase units can be
- phase assembly 102 is reconstructed by positioning top housing plate 105 over
- housing plates 104, 105 together. Conversely, to add a phase unit to a phase assembly 102, the housing plates 104 and 105 are separated and the shafts of the
- new phase unit are positioned within corresponding wells 111 in base housing
- the top housing plate 105 is positioned over it so that the shafts of the new phase unit are also received in their respective wells 111.
- the housing plates 104, 105 are positioned over it so that the shafts of the new phase unit are also received in their respective wells 111.
- phase assembly 102 provides for one module of a particular phase unit or all the phase units to be removed by the procedure discussed above. Further, it is also possible for the phase assembly 102 to be expanded beyond the capacity of its
- phase units will be positioned on the shafts of the existing phase units and then the additional phase units can be inserted as discussed above.
- the stator 101 can be formed from a plurality of
- stator plates (laminations) fixed together to prevent relative movement of the stator plates
- stator 101 can be formed in accordance with conventional practice and of the same material as the laminations 250. Below and above the stack of stator plates, rails 401 and 402 are attached in
- stator 101 is slidably coupled to its
- each phase unit 121-123 has associated therewith eight stator guide bearings 112, four associated with each module.
- bearings 112 rotate as the stator 101 and phase assembly 102 move relative to each
- stator guide bearings 112 roll in
- stator unit assembly 102 moves longitudinally along the stator 101.
- stator guide bearings 112 are interposed between the stator 101 and the modules to prevent
- the size of the air gaps 351, 350 on one side of the stator 101 is preferably the same as on the other side of the stator 101. In other words,
- stator 101 is preferably centered exactly between opposing modules of
- stator 101 is rarely initially positioned so
- present invention includes a positioning system that is used to adjust the distance between each module and the stator 101.
- the guide In the positioning system, the guide
- bearings 112 are held on compliant shafts 319 so that a space between opposing
- a preload on the shafts 319 causes a mechanical force that is applied to the stator 101 through bearings 112.
- the shafts 319 are preloaded such
- stator 101 a preload of about 100 lbs. of force per bearing 112 is applied against the stator 101 when the stator
- the pressure per bearing can vary by about 25
- stator guide bearings 112 then adjust the stator guide bearings 112
- stator 101 location of the stator 101 so that same sized air gaps 350, 351, shown in Fig. 3,
- each of the paired modules is spaced equidistant from the stator 101 creates symmetry about the stator 101 and reduces the amount of vibration and
- variable reluctance motor acoustic noise created during the operation of the variable reluctance motor.
- the shafts 319 are secured to the base and top housing plates 104,
- each guide bearing 112 is securely held against movement in a
- the shafts 319 are formed of a non-ferromagnetic material that permits them to bend in a direction that extends at an angle to their length.
- One such material used for shafts 319 is a stainless steel in the 300 stainless steel
- each guide bearing 112 includes a conventional
- Examples include bearings having fluid between inner and outer bearing surfaces.
- bearings that include dry metal lubricants on at least
- a first way includes increasing or decreasing
- a second way includes adjusting the number of windings of the coil 140 about the bobbin 100.
- a third way includes
- Each phase unit comprises at least one of the modules described
- phase assembly 102 comprises at least one unpaired
- phase assembly 102 comprises paired modules 131, 132 as shown in Fig. 7A.
- translational position be adjusted such as by being turned on or off.
- the modular phase variable reluctance motor of the present invention reduces hysteresis losses
- Hysteresis losses are proportional to the frequency of directional
- the flux direction in adjacent phase units 121-123 is alternated.
- the flux for phase unit 121 is in a clockwise direction
- the flux for phase unit 122 is in a counter-clockwise direction
- the flux for phase unit 121 is in a clockwise direction
- the flux for phase unit 122 is in a counter-clockwise direction
- the flux for phase unit 123 is in a clockwise direction. In another embodiment, the flux for phase unit 121 is in a counter-clockwise direction, the flux for phase unit
- phase unit 122 is in a clockwise direction and the flux for phase unit 123 is in a counter ⁇
- phase units 121-123 may respectively have fluxes in an A-A-B pattern, an A-B-B pattern or any other
- A is a first direction and B
- the first phase unit has a first flux direction while the second phase unit may have a second
- the motor has four phases, the flux direction for each respective phase unit is A-B-A- B, A-A-B-B, A-A-A-B, A-B-B-B or any other alternating or partially alternating A B pattern.
- Independent control of the flux direction for each phase unit such as
- phase units 121-123 is made easier where the phase units are each
- ferromagnetic material means any material possessing or exhibiting ferromagnetic properties, as that term is commonly
- top and base are for reference purposes only and are not intended to be limiting on the position of the housing plates 104,105 or
- FIG. 8 illustrates another embodiment of the present invention in
- variable reluctance rotary motor system 800 that comprises five
- the motor system 800 does not
- rotary variable reluctance motor system 800 is used with a machine that receives and positions components in a substrate.
- One example application is motor vehicle drive systems, including direct drive systems.
- reluctance motors that operate as servo motors so that any desired position can be
- the motor operates as a stepper motor.
- each phase assembly of the motor system 800 comprises
- each phase assembly 801-805 comprises three phase units 821, 822, 823 corresponding to phases A, B and C, respectively, of
- phase units include more than three phase units.
- the particular number of phase units for each phase assembly depends on the desired number of phases for each motor.
- phase units 821-823 are
- phase assembly is chosen according to the power requirements of motor system
- phase units 821-823 are substantially identical, assembly of
- phase units 821-823 are identical to phase units 821-823.
- phase units are modular phase units.
- module means comprising removable and replaceable sections (modules).
- the phase is one embodiment, the phase
- Each phase unit 821-823 comprises two
- each phase unit 821-823 is a first embodiment shown in Fig. 8, each phase unit 821-823
- Phase-module 831 includes an outer phase-module 831 and an inner phase module 832.
- Phase-module 831 includes an outer phase-module 831 and an inner phase module 832.
- modules 831 and 832 are positioned on opposite sides of a substantially circular
- each phase unit 821-823 includes only one phase module. In one such embodiment, each phase unit 821-823 includes only the outer phase module
- phase units 821-823 include only the inner
- phase module 832 each phase module 831, 832
- Fig. 9 illustrates a preferred embodiment of a core 820 for the outer phase module 831.
- phase units are arranged in a substantially circular configuration about
- each phase assembly is less than the distance between the outer phase units 821, 823 of adjacent phase assemblies 801-805.
- the distance between the outer phase modules 831 of each phase assembly may be greater than the distance between the inner phase modules 832 for the same phase assembly.
- the substantially circular rotor 810 is positioned
- phase modules 831, 832 of the phase units 821-823 moves in a
- phase modules 831, 832 and their phase units 821-823 as the phase units 821-823 are energized As used herein, the
- variable reluctance motor system 800 In the embodiment of the variable reluctance motor system 800
- phase units 821-823 of each phase assembly 801-805 are
- phase assemblies 801-805 are fixed against rotation.
- the phase assemblies 801-805 are fixed against rotation.
- the rotor 810 is configured to rotate between the phase modules 831, 832 in a complete revolution
- phase units 821-823 rotate along the inner and outer
- the term “configured” means operatively arranged so as to perform a specified function.
- rotor 810 rotates between the modules 831, 832 of the phase units 821-823 during
- a turret 850 also moves in the same
- phase units 821-823 of any one of the phase assemblies 801-805 is controlled by
- phase assemblies 801-805 One example of a controller suitable for use in the present invention is described in U.S. Patent No. 5,621,294, which is hereby
- the rotor 810 is secured to the turret 850 by a plurality of fastening members 851 such that motion of the rotor 810 results in motion of the turret 850.
- the turret 850 rotates about
- back plate 839 is supported by a bearing that forms a part of back plate 839.
- the bearing is secured to the back plate 839.
- the modules 831 and 832 of each phase unit 821-823 secured to the back plate 839 face each other from opposite sides of the rotor 810.
- the modules 831 and 832 are similar, but they differ in their size
- each module 831, 832 relates to the curved shape of the face 835 of each module 831, 832 that is proximate to, and coextensive with, the rotor 810.
- each module 831, 832 is the same from phase unit 821-823 to phase unit 821-823 and from phase assembly to phase assembly 801-805.
- the first module 831, 832 is the same from phase unit 821-823 to phase unit 821-823 and from phase assembly to phase assembly 801-805.
- phase unit 821-823 same from phase unit 821-823 to phase unit 821-823 and from phase assembly
- phase assembly 801-805 to phase assembly 801-805.
- This consistent spacing between the modules 831, 832 of the phase units 821-823 and the rotor 810 provides the motor system
- While the motor assembly 800 includes embodiments with one
- phase assembly 801 module and embodiments with a plurality of modules, for ease of explanation the specifics of only one phase assembly 801 will be discussed. Additionally, only one phase unit 821 with phase modules 831, 832 on opposite sides of the rotor 810
- the modules 831, 832 is equally applicable to the other phase assembly 802-805 and phase units 822, 823 of the motor system 800.
- motor 800 includes at least one phase unit 821 and phase modules 831, 832.
- Each phase module 831 and 832 comprises a core
- Outer phase module 831 also includes a concave rotor face 835 that follows
- modules 831 and 832 further comprise a pair of the shafts 882 and 883 that extend through passages in
- core 820 comprises a stack of laminations.
- motor system 800 In one embodiment of the motor system 800,
- the core 820 is formed of silicon iron. Other embodiments include cores formed
- modules 831 and 832 each include a bobbin 899 that is formed of a non-conductive
- Both modules 831, 832 further includes a wire coil 840 comprising at
- 840 can include about 100 windings.
- core 820 is substantially C-shaped. In an embodiment in which the core 820 comprises laminations, the laminations are
- Each core 820 includes a pair of legs
- Each leg 893, 894 comprises a plurality of teeth 815.
- Each tooth 815 includes an outer longitudinal flux surface 816. The surfaces 816 are separated from each other by corresponding grooves 817.
- grooves 817 not only separate adjacent surfaces 816, but the shape of the grooves 817 also defines the shape of each tooth 815.
- core 820 includes
- the material is silicon iron. Another suitable ferromagnetic material that has a high saturation level at low current levels.
- the material is silicon iron.
- HIPERCO ® available from
- core 820 comprises a stack of core laminations
- adjacent stacked core laminations are fixed together to prevent their
- each stacked C-core lamination is bonded to an adjacent lamination by a non-conducting bonding epoxy that is applied by
- MATERIALS is a sulfonated polysulfone polymer glass fiber reinforced material that is used as the insulating, non-conductive adhesive material.
- EP19 HT-FL(SP) 8515 Flexiblize Mix available from Master Bond ®
- Polymer System is an acceptable epoxy for securing adjacent laminations
- C-core laminations are then submerged in a bonding epoxy (adhesive) within an impregnation fixture.
- the fixture cover is then closed and the vacuum turned on.
- the vacuum is maintained for about 20 minutes after the vacuum pressure level
- the C-core laminations are removed from the impregnation fixture and set in a
- the adhesive is allowed to drip for about one hour. Any excess adhesive is cleaned from the stack and the bobbin is installed. The silicon caps are also removed and the C-cores are clamped in a curing fixture.
- the curing fixture
- Cooling occurs in an oven at approximately 100 degrees. After the cooling has been completed, the C-core stack 201 is removed from the curing fixture and excess adhesive is removed.
- a module 831, 832 includes about twenty to about one hundred-twenty five secured laminations.
- One stack includes about seventy secured C-core laminations. Each of these laminations is
- Wire coil 840 is formed by winding a wire at least one time, i.e., at least one turn, around the bobbin 899 at the center of module 831 and another wire
- Wire coil 840 is wound around the bobbin 899 of module 832. Wire coil 840 is guided by
- the bobbin 899 which fits securely around the center 895 of core 820 as seen in Fig. 12.
- the bobbin 899 includes grooves on its outer surface for receiving the coil 840.
- the wound coil 840 is positioned by bobbin 899 in a
- the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the motor system 800 compared to prior art motor systems. Similarly, the
- each bobbin 899 has a substantially fan-like
- the bobbins 899 of modules 831 and 832 both have an angled shape and include first and second
- the sidewalls 905 and 906, is between about 0 and 80 degrees.
- the angle is about 15 degrees. In another embodiment of the module 831, the angle is about 15 degrees. In another
- the angle is about 5 degrees.
- the bobbin 899 extends between sidewalls 905 and 906 and is received in a recess
- bobbin 899 is received in an opening 925 and positioned between the legs 893, 894
- the first and second sidewalls 905, 906 are spaced apart by a greater distance along the outer surface 907 of the bobbin 899
- each sidewall 905, 906 increases in
- each sidewall 905, 906 includes a hook member for anchoring the bobbin 899.
- the bobbin 899 is secured together and
- distribution pattern of the coil 840 are advantageous in directing the flow of magnetic flux through the legs 893 and 894 of the module 831, 832 and toward the
- the shape also provides better spatial distribution of the individual
- the fan shape results in the formation of only a few, e.g., one or two, layers of windings on an outer
- the preferred embodiment provides for a more efficient dissipation of
- the bobbin 899 is formed of a conventional electrically insulating material
- the bobbin 899 is made of two pieces formed of
- non-ferromagnetic and nonconductive materials such as plastics.
- plastics In another embodiment, non-ferromagnetic and nonconductive materials such as plastics.
- the material used to form the bobbin 899 includes liquid crystal polymers. No matter die material used, the bobbin 899 in one embodiment
- the unitary bobbin 899 is molded directly on and over the core 820 as a single piece.
- known electrically insulating materials are positioned between the
- the rotor 810 As illustrated in Fig. 10, the rotor 810, like the core 820, is formed
- the spacing between the modules 831, 832 and the rotor 810 creates air gaps.
- the size of the air gap on one side of the rotor 810 is preferably the same as on the other side of the rotor 810. In otlier words, the rotor
- a first way includes increasing or decreasing the number of laminations in core 820.
- a second way includes adjusting the number
- a third way includes adjusting the
- Fourth and fifth ways include
- phase unit in conjunction with rotor 810.
- adjacent phase units are electrically and magnetically isolated and
- modular phase variable reluctance motor system 800 reduces hysteresis losses in the rotor 810 that would be caused by reversing magnetic flux direction.
- Hysteresis losses are proportional to the frequency of directional
- the flux direction in adjacent phase units 821-823 is alternated.
- die flux for phase unit 821 is in a counter-clockwise direction
- the flux for phase unit 822 is in a clockwise direction
- phase unit 821 is in a clockwise direction, the flux for phase unit 822 is in a counter ⁇
- phase unit 823 is in a clockwise direction.
- ferromagnetic material means any material possessing or exhibiting ferromagnetic properties, as that term is commonly
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Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2002316370A AU2002316370A1 (en) | 2001-06-25 | 2002-06-25 | Variable reluctance motor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US30072801P | 2001-06-25 | 2001-06-25 | |
US60/300,728 | 2001-06-25 | ||
US92943801A | 2001-08-14 | 2001-08-14 | |
US09/929,438 | 2001-08-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2003000017A2 WO2003000017A2 (en) | 2003-01-03 |
WO2003000017A3 WO2003000017A3 (en) | 2003-03-20 |
WO2003000017A9 true WO2003000017A9 (en) | 2004-05-06 |
Family
ID=26971944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/020072 WO2003000017A2 (en) | 2001-06-25 | 2002-06-25 | Variable reluctance motor |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2002316370A1 (en) |
WO (1) | WO2003000017A2 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4935676A (en) * | 1987-04-17 | 1990-06-19 | General Signal Corporation | Method of moving head to correct for hysteresis |
US5331246A (en) * | 1992-12-30 | 1994-07-19 | Dana Corporation | Coil assembly retainer for electric motor |
GB9308841D0 (en) * | 1993-04-29 | 1993-06-16 | Univ Leeds | Linear actuator |
US5760507A (en) * | 1996-02-06 | 1998-06-02 | Ford Global Technologies, Inc. | Electrical generating system for a motor vehicle |
US6078114A (en) * | 1998-04-08 | 2000-06-20 | Universal Instruments Corporation | Method and apparatus for vibration reduction/control in a variable reluctance linear motor |
-
2002
- 2002-06-25 AU AU2002316370A patent/AU2002316370A1/en not_active Abandoned
- 2002-06-25 WO PCT/US2002/020072 patent/WO2003000017A2/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
AU2002316370A1 (en) | 2003-01-08 |
WO2003000017A2 (en) | 2003-01-03 |
WO2003000017A3 (en) | 2003-03-20 |
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