Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/18—Rotary transformers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
  • H01F38/14—Inductive couplings

Definitions

• the present invention relates to a rotating electric machine, and more particularly to a rotary transformer, such as a rotary transformer, which is arranged to provide a relative rotational movement between an outer core and an outer core. And a rotating electric machine having an inner core.
• a plurality of coils are embedded in the inner peripheral surface of the outer core and the outer peripheral surface of the inner core so as to be separated from each other in the axial direction.
• Each coil is embedded in a groove formed on the inner peripheral surface of the outer core or the outer peripheral surface of the inner core.
• each coil is configured by winding a plurality of round metal wires.
• the cross-sectional shape of the groove is sufficiently larger than that of the coil.
• the occupancy of the coil in the groove is low. Therefore, the coupling coefficient between the coil of the inner core and the coil of the outer core facing the coil is low, and the efficiency of the rotating electric machine is also low.
• the present invention increases the occupancy of the coil in the groove, and thus the inner core coil and the outer coil facing this coil.
• the purpose is to increase the coupling coefficient between the core and the coil and obtain a highly efficient planar electric machine.
• the cross-sectional shape of the metal wire of the coil in the groove of the core is non-circular.
• FIG. 1 is a cutaway sectional view showing a coil in a rotor core of the rotary transformer shown in FIG. 3,
• the second II is a cutaway sectional view showing the coil in the rotor core of a conventional rotor transformer.
• FIG. 3 is a vertical cross-sectional view showing a mouth-to-mouth translucent to which an embodiment of the present invention is applied,
• FIG. 4 is a partially broken perspective view showing a rotor core of the rotary transformer of FIG. 3,
• FIG. 5 is a partially broken perspective view showing the rotor core before the coil is mounted.
• FIG. 6 is a perspective view showing the entire device for mounting the coil on the rotor core
• FIG. 7 is a side view of the device of FIG. 6,
• FIG. 8 is a front view showing details of a coil forming device of the device of FIG. 6,
• Fig. 9 and Fig. 10 are views from K-K line and X-X line in Fig. 8, respectively.
• FIG. 12 is a cutaway sectional view showing a coil in a rotor core of a rotary transformer to which another embodiment of the present invention is applied
• FIG. 13 is a sectional view showing a rotor core with a coil mounted thereon
• FIG. 14 is an enlarged partially cutaway sectional view showing the rotor core of FIG. 13;
• FIGS. 15 and 16 are diagrams showing coil elongation
• FIG. 17 is an enlarged vertical sectional view showing the positional relationship between the rotor core and the pusher
• Fig. 18 is a sectional view showing the movement of the coil in the coil groove.
• Fig. 19 shows the load-elongation diagram of the coil wire
• FIG. 20 is a perspective view showing a coil of still another embodiment
• FIG. 21 is a cross-sectional view showing a rotary transformer of another embodiment
• FIG. 22 is a perspective view of the rotary transformer of FIG.
• a rotary transformer 1 to which an embodiment of the present invention is applied is provided with an outer tubular core, that is, a rotor core 10, and is disposed inside the rotor core 10 so as to be relatively rotatable. And an inner tubular core, namely a stator core.
• a channel for accommodating the coil 12 is provided on the inner peripheral surface of the core 10 of the rotary transformer 1.
• a plurality of circumferential coil grooves 11 having a tunnel cross-sectional shape are formed axially separated from each other.
• a plurality of axial terminal grooves 13 parallel to the axis are formed on the inner peripheral surface of the rotor core 10 so as to be spaced apart from each other in the circumferential direction.
• the end of the coil 12 extends inside the terminal groove 13 to the outside of the core 10.
• the coil 12 buried in the coil groove 11 is formed by winding a plurality of metal wires, twice in the illustrated embodiment.
• the cross-sectional shape of each metal wire is elliptical and fits closely in the coil groove 11.
• the rotor core 10 shown in FIG. 1 has a higher occupancy in the coil groove than the rotor core shown in FIG.
• the coupling coefficient between the inner core and the coil is higher than that of the conventional one.
• the coil is held in the coil groove by the adhesive 12 '.
• the rotor core 10 shown in FIG. 1 since the coil 12 is closely fitted in the coil groove 11, it is not necessary to use an adhesive. Therefore, it is possible to prevent an increase in leakage inductance caused by the presence of the adhesive.
• the coil is formed by winding a metal wire several times to form a pre-formed coil and holding a coil, and an extension mechanism for opening and closing the coil holding jig 20. 30, a motor section 40 for rotationally positioning the coil holding jig 20 and the extension mechanism section 30, and processing of the end of the former molding coil wound on the coil holding jig 20.
• a core positioning section 80 for positioning the core holding section 70, and a coil shaping section 9 for further expanding and shaping the coil 12 pushed into the coil groove 11 of the rotor core 10.
• the coil holding jig 20 includes a pusher 21 on which a metal wire 24 having a circular cross-sectional shape is wound to form a pre-formed coil, and an end hook for temporarily holding an end of the pre-formed coil. 2 9 and a wire hook 28 for holding one end of the wire 24.
• the pusher 21 has a large-diameter portion 2 11 and a small-diameter portion 2 12 formed integrally therewith.
• the bushing 21 is equally divided in the axial direction into four bushing pieces 2 1 ′.
• the coil guide 25 on which the wire 2 is wound is formed on the outer peripheral surface of the small diameter portion 2 12.
• Coil guide 25 has a groove 251 with enough width to accommodate the coil. Are formed at both ends thereof, and a stud 25 2 having a height of 1 to 2 or less of the wire diameter of the wire 24 is formed.
• the end hook 29 is provided on the end face of the busher 21.
• the end of the coil wound around the coil guide 25 of the coil holding jig 20 is connected to the terminal groove of the rotor core 10.
• the wire hook 28 is fixed to the large-diameter portion 211 of the pusher 21, it is synchronized with the rotation of the busher 21. Further, the wire hook 28 is provided radially outward from the axis of the pusher 21 so as not to interfere with the core holding portion 70 even when the core holding portion 70 slides.
• the wire hook 28 is provided with a hook 2 81 for hooking one end of the wire 2.
• the extension mechanism 30 is a socket for attaching the pusher 21.
• an air chuck 3 2 for opening and closing movement of the grip portion 3 1, a flange 39 for adjusting the opening and closing amount, and an air feeder for supplying air for driving to the air chuck 3 2.
• a flange 3 4 for holding the air chuck 3 2, a timing pulley 3 6 attached to the flange 34 and receiving the rotational force of the motor section 40 by the timing belt 35. It consists of a bearing 37 for smooth rotation of the flange 34 and a bracket 38.
• the grip 31 holds the large-diameter part 2 1 1 of the pusher 21, and is opened and closed by the air chuck 32 to push the pusher 21.
• the shear pieces 2 1 ′ are moved toward and away from each other in the radial direction.
• the air chuck 32 performs an opening / closing operation by supplying air of a predetermined pressure, and is a rotary type capable of continuously supplying air even when the chuck rotates.
• the tongue 39 comes into contact with the grip part 31, and the pusher 21 adjusts the inner diameter of the former molding coil and the amount of pushing of the former molding coil into the coil groove. is there. By adjusting the position of the flange 39, it is possible to cope with the rotor core 10 having a different inner diameter and the coil groove 11 having a different depth.
• the air feed pipe 33 supplies air for driving to the rotary type air chuck 32, and is fixed to the arch chuck 32 so that the air is not affected by the rotation. It is possible to supply.
• the flange 34 holds the end face of the air chuck 32 opposite to the end 31.
• a flanged pipe 33 passes through the inside of the flange 34, and a tubular pulley 34 1 to which a timing pulley 36 and a bearing 37 are attached is protruded from an outer periphery thereof. I have.
• the motor section 40 includes a motor 41, a timing pulley 42 driven by the motor 41, and a bracket 43.
• the timing pulley 42 rotated by the motor 41 rotates the flange 34 of the extension mechanism 30 via the timing belt 35.
• the forming guide section 50 is located on the outer periphery of the pusher 21.
• a forming guide 51 for holding the wound wire 24 from above to prevent the wire 24 from floating a guide plate 52 for holding the forming guide 51, and a guide plate 5 2 and a stopper 5 3 for restricting the descending and descending of the forming guide 51, and an adjuster for adjusting the amount of descending of the forming guide 51 by contacting the stopper 53 5 4, an air cylinder 55 that moves the forming guide 51 up and down, a linear guide 56 that guides the forming guide 51, a block 57 and a bracket that supports the block 57. 5-8.
• the forming guide 51 has a thickness substantially equal to the diameter of the wire rod 24 as shown in FIG. Thereby, at the time of processing the end portion of the wire 24, an appropriate curvature can be given to the wire 24 at the bending point, and the dimensions can be accommodated in the terminal groove 13 of the rotor core 10. .
• the contact between the forming guide 51 and the wire 24 is made in a state where the wire 24 is wound around the groove 25 1 of the pusher 21.
• a recess 5 11 1 is formed to allow sufficient entry of the opening 2 52.
• the depth of the recess 5 11 is almost the same as the wire diameter of the wire 24. Due to the recesses 5 11, the wire 24 can be sufficiently pressed down at the time of the end treatment of the wire 24, so that the lifting of the wire 24 can be prevented.
• the solvent coating section 60 is for bonding the wires 24 having self-fusing properties.
• Solvent application section 60 Nozzle 61 dripped onto the material 24, a syringe 62 for supplying the stored solvent to the nozzle 61, a support plate 63 supporting the syringe 62, and a support plate 63
• a base 64 attached to the base, a stopper 65 attached to the base 64 to limit the lowering of the syringe 62, and a stopper 65 to contact the stopper 65 and adjust the descending amount.
• Adjuster 66 air cylinder 67 for driving base 64 to move cylinder 62 up and down, linear guide 68 for guiding up and down, and block 6 9 and a bracket 691, which supports the block 69.
• the core holder 70 includes a core holder 71 for holding the rotor core 10, a holder plate 72 for holding the core holder 71, and a core holder 71 attached to the holder plate 72 in the rotation direction of the core holder 71.
• a T-type bracket ⁇ 7 attached to the lower guide 75, a preload spring 78 to hold down the L-type bracket 76 to the T-type bracket 77, and a preload spring 78.
• It consists of an energizing preload bolt 79 and a bracket 721.
• the core positioning portion 80 is provided with a plate 81 for mounting the core holding portion ⁇ 0 and the rotor core 10 via the T-shaped bracket 77 of the core holding portion 70 which is installed on the plate 81.
• Jig cylinder 82 for eccentric movement in the vertical direction and core JP90 01154
• the linear guide 83 which is a guide when moving the holding part 70 to the bushing 21, and the pitch of the coil groove 11 of the rotor core 10 attached to the side of the linear guide 83.
• the spring plunger 85 for contacting and pressing the groove of the core positioner 84 for positioning, and the spring plunger 85 , And a horn, ⁇ 87.
• the coil shaping section 90 includes a jig 91 for expanding and shaping the former-stage forming coil and an L-shaped bracket to which the jig 91 is fixed.
• the jig 91 is inserted into the rotor core 10 as the coil shaping section 90 advances (to the left in FIG. 8).
• the jig 91 is a hollow rubber cylinder having an outer diameter smaller by 0.2 mm than the inner diameter of the rotor core 10, and has an outer diameter of 0.4 to 0.5 lot. It has elasticity that can be applied.
• the guard 95 controls the advance of the plate 92.
• one end of the wire 2 Is hooked on a wire hook 28 and wound on a coil guide 25 to form a former-stage molding coil.
• the end of the former-stage forming coil is hooked onto the hook 29 and shaped so that the end enters the terminal groove 13 of the rotor core (FIG. 11C).
• the coil holding jig 20 is inserted and positioned in the rotor core 10 so that the former molding coil and the coil groove are aligned (FIG. 11D).
• the busher 21 is expanded outward in the radial direction, and the preformed coil is fitted into the coil groove 11 of the rotor core 10 (FIG. 11E).
• the coil 12 is housed in the coil groove 11 of the rotor core 10 (FIG. 11F).
• the rotor core 10 held in the core holding portion 70 has the shape shown in FIG.
• d represents the diameter of the wire 24 forming the former-stage forming coil (FIG. 1).
• the cross-sectional shape of the wire of the coil installed in the coil groove 11 is rectangular as shown in FIG. In this case, the occupancy ratio is increased and the coupling coefficient is increased as compared with that in FIG.
• the coil 12 mounted in the coil groove 11 consists of an arc 1 2c concentric with the arc of the busher 21 and a straight section 1 2 £ extending between the bush pieces 2 1 '. I'm sorry.
• the force acts only in the radial direction, and the acting force is smaller than that of the straight part. Therefore, the pusher 21 is inserted into the core such that the center of the arc portion of the coil corresponds to the coil groove 13. This allows the end of the coil There is no danger of dragging into the terminal groove or interference with other coils such as friction (Figs. 13 and 14).
• the elongation rate of the coil 13 the elongation rate differs between the straight part and the arc part.
• the center of the arc is set at an angle of 0 °
• the position of the circumference of the coil 13 is determined as shown in Fig. 15, and the elongation rate at each location of the coil is determined.
• Figure 16 shows As is clear from Fig. 16, the elongation rate is larger at the angle of 45 °, that is, the straight part of the coil 12, and becomes almost zero at the center of the circular arc part, and the elongation rate graph almost draws a sin curve. This indicates that no force acts at the center of the arc.
• the desired properties can be obtained.
• the use of the wire 24 that allows for the elongation after plastic deformation improves the performance as a transformer.
• the limit value of the elongation rate of the wire rod 24 is determined from the leakage inductance between the coil 12 and the rotor core 10, the coupling coefficient, etc., and the core is inserted into the rotor core 10 so that the elongation rate is within this limit value.
• the rotor core 10 is formed by expanding the coil 12 after inserting it.
• the outer diameter of the pusher where the coil is mounted is D 3
• the inner diameter of the core is D 2
• Clearance is C
• the clearance C is, as shown in Fig. 17, the inner diameter of the core 10 and the coil 1 2 wound on the busher 21. It is the size of the clearance with the diameter of.
• X is the springback amount of the coil 12 generated after the coil 12 is expanded by the pusher 21 as shown in FIG.
• the coupling coefficient K is lower than a certain value, it does not serve as a transformer, and the coupling coefficient K must be higher than a certain value. Therefore, the growth rate! Must satisfy this condition.
• the gap length g is a dimension of a gap between the coil of the rotor core 10 and the coil 13 of the stator core.
• the facing area S i is an area of a portion facing the stator on both sides of the coil groove 11 of the rotor core into which the coil is inserted.
• the measured value D 2 15.35
• the clearance C 0.1
• the coil line ⁇ d 0.16 . 8 2 concessions.
• the elongation rate or, due to the geometric constraint is obtained by substituting the outer diameter D 3 of the busher, the inner diameter D 2 of the core, and the amount X of springback determined by equation (1) into equation (2).
• the wire does not break unless the elongation exceeds 20%, but the coating peels off when the elongation exceeds 14 to 15%, and cracks occur rapidly. May cause a large change in resistance. Therefore, it is necessary to keep the elongation at about 13% at the maximum.
• a coil 12 is formed from a metal wire having an elliptical cross-section or a rectangular cross-section, and the coil 12 is formed in a groove of the rotor core 10 or the stator core. It may be buried.
• a rotary translator of the type shown in FIGS. 21 and 22 can be formed.
• This rotary transformer has an inner stator core 10, an outer stator core 10 a, and an intermediate rotor core 10 c disposed therebetween. With this rotary transformer, the same effects as those of the above-described rotary transformer can be obtained.
• Such a rotary transformer 1 can be used, for example, in a tape running system of a video tape recorder (VTR).
• VTR video tape recorder

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Recording Or Reproducing By Magnetic Means (AREA)
• Manufacture Of Motors, Generators (AREA)
• Windings For Motors And Generators (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=16946254

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (4)

Family Cites Families (2)

• 1990
  • 1990-09-10 JP JP2236964A patent/JP2986876B2/ja not_active Expired - Fee Related
  • 1990-09-11 DE DE19904091518 patent/DE4091518T1/de not_active Withdrawn
  • 1990-09-11 KR KR1019910700458A patent/KR960008791B1/ko not_active Expired - Fee Related
  • 1990-09-11 WO PCT/JP1990/001154 patent/WO1991003824A1/ja active Application Filing
• 1996
  • 1996-12-06 KR KR96706952A patent/KR970004572B1/ko not_active Expired - Fee Related

Patent Citations (4)

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