JP3314452B2 - Axial gap resolver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial gap resolver for detecting a rotational position of a rotating body.

[0002]

2. Description of the Related Art Conventionally, a rotary transformer including a primary core, a primary winding, a secondary core, and a secondary winding, and a signal generating unit including a rotor core, a rotor winding, a stator core, and a stator winding are provided. There is an axial gap resolver sequentially arranged in the diameter direction (for example, Japanese Utility Model Application Laid-open No. 60-1).
No. 14580). Also, as a coil of an axial gap motor with a DC brush, a plurality of half-coil pieces formed by etching are arranged in parallel from the outer circumference to the inner circumference on both sides of the donut-shaped insulating substrate, and the front and back half-coils are formed through through holes. There is a type in which pieces are electrically connected (for example, JP-A-1-126142).

[0003]

However, the prior art has the following problems. 1) The former axial gap resolver has a large inertia on the rotating side (secondary side), and a winding is wound around a core slot, so that a slot ripple is added to the detection signal. 2) The latter coil is disclosed as a technique for an axial gap motor with a DC brush. However, since the coils on the front and back are connected by through holes, the coil pattern on processing may affect the size of the through holes. Although it is difficult to obtain a fine resolution, it is expected that the improved characteristics will be exhibited when applied for a resolver. Accordingly, it is an object of the present invention to provide a highly accurate axial gap resolver with no slot ripple by improving and applying the latter coil to the excitation and detection coils of the former axial gap resolver.

[0004]

In order to solve the above problems, the present invention provides a primary core 1a, primary coils 1c and 2c.
Rotary transformer T composed of secondary core 2a and secondary coil 2c
And an axial gap resolver comprising a signal generating section comprising a rotor core and an excitation winding and a stator core and a detection winding, wherein the rotor core and the stator core are a disk-shaped rotor core 5a and a stator core 6a, and the excitation winding and the detection winding are Excitation winding 5c and detection winding 6c having a coil pattern in which a plurality of half coil pieces formed on both sides of a disc-shaped insulating substrate are arranged in parallel from the outer circumference to the inner circumference direction, and the front and back half coil pieces are electrically connected. And an excitation winding 5c on the surface of the rotor core 5a and a stator core 6a
The detection winding 6c is attached to the surface of the sensor, and the excitation winding 5c and the detection winding 6c are opposed to each other via a gap in the axial direction.

[0005]

When a sinusoidal exciting current is supplied to the exciting winding 5c through the rotary transformer T, a detection voltage is induced in the detecting winding 6c with a predetermined phase by the magnetic field generated by the sinusoidal exciting current.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a configuration of a signal generator, and FIG. 3 is a plan view showing patterns of excitation and detection coils. The primary side T1 of the rotary transformer, in which a toroidal primary coil 1c is wound in a groove of a ring-shaped primary core 1a made of a ferromagnetic material having an annular groove on the inner diameter side, It is fixed to the end face. A toroidal secondary coil 2c is inserted into a groove of a ring-shaped secondary core 2a made of a ferromagnetic material having an annular groove on the outer diameter side through a radial gap with the primary side T1 of the rotary transformer. The secondary side T2 of the wound rotary transformer is fixed to the shaft end of the rotary shaft 3 such as a motor. The rotary transformer T is constituted by the primary side T1 and the secondary side T2 of the rotary transformer. As shown in FIG. 2, a narrow ring-shaped rotor core 5a formed by toroidally winding a band-shaped thin ferromagnetic material is fixed to the end of the rotating shaft 3 outside the secondary core 2a. An insulating film 6 is formed on the surface of the rotor core 5a. On the insulating film 6, an exciting winding 5 made of a thin film is formed on an insulating substrate 7.
c is formed and affixed. The surface of the exciting winding 5c is coated with an extremely thin insulating film. The coil 2C on the secondary side T2 of the rotary transformer is connected to the exciting winding 5c by a lead wire L. Through the gap in the axial direction with the exciting winding 5c,
A detection winding 6c made of a thin film provided with an insulating film 6 on the surface is formed on an insulating substrate 7 and is opposed to each other. A stator core 6a having the same configuration as the rotor core 5a is provided on the back of the detection winding 6c.
Is fixed. The stator core 6a is fixed to an end face of the casing 4. The excitation winding 5c and the detection winding 6c constitute a signal generator. The patterns 8E and 8D of the excitation winding 5c and the detection winding 6c are formed by etching a good conductive material and performing CVD (Ch
emapical Vapor Deposition and PVD (Physical Vapou)
a plurality of half-coil pieces 8 of a good conductor having a width of, for example, 50 to 200 μm, which are formed by r deposition.
a are arranged in parallel with a predetermined inclination from the outer circumference toward the inner circumference, and on the back surface, a half coil piece 8a and a plurality of half coil pieces 8b are arranged as targets. For details of the winding patterns 8E and 8D, a plurality of half-coil pieces 8a (front) and a half-coil piece 8b (back) of a good conductor are provided on the front side and the back side of the thin doughnut-shaped insulating substrate 7, respectively. When the inner and outer diameters are n and m are positive integers, n * (the number of exciting phases * 2 * the number of pole pairs) and m * (the number of the detected phases * 2 * the number of pole pairs) are equally divided, and the electric field is formed at an equal angular pitch. An upper pattern 8U and a lower pattern 8L in which a plurality of half coil pieces 8a (front) and 8b (back) of the conductor are arranged in parallel are overlapped and connected at an appropriate position. Usually, the number of pole pairs should be matched with the number of pole pairs of the drive motor.

FIG. 3 shows a winding pattern which is suitable for a six-pole drive motor and is exemplified by three-pole pair detection of one-phase excitation and two-phase detection. The inner and outer diameters of the insulating substrate 7 are determined by the excitation side winding pattern 8.
E is 6 * 1 * 6 = 36 (m = 6), the detection side winding pattern 8D is equally divided into 3 * 2 * 6 = 36 (n = 3), and the half coil piece 8a (table ), 8b (back). For convenience of explanation, it is clockwise at a pitch of 10 degrees from 0 degrees to 350 degrees. The half coil piece 8a on the front side is shown by a solid line, and the half coil piece 8b on the back side is shown by a broken line. The winding pattern 8E of the exciting winding 5C is shown in FIG.
As shown in the figure, an upper pattern 8U is provided on the front side and a lower pattern 8L is provided on the back side with the insulating substrate 7 interposed therebetween. The upper pattern 8U on the front surface side of the insulating substrate 7 includes a point on the inner diameter side and a point on the outer diameter side shifted from each other by 60 degrees (= 360 degrees / (2 * 3 pole pairs)) (for example, a point on the inner diameter side of 0 degrees). 6 counterclockwise
A half-coil piece 8a, which is connected to a point on the outer diameter side shifted by 0 ° by a good conductor by an involute curve, is connected to the insulating substrate 7
Are arranged in parallel at equal intervals of 10 degrees with respect to the origin. 310 to 350 degrees, 10 to 50
The point on the outer diameter side which is shifted 60 degrees from the point on the inner diameter side which is located in degrees (the point from 250 degrees to 290 degrees and the point from 310 degrees
The half-coil piece 8a connecting to the (50-degree point) is inclined at the point 8P provided on the outer diameter side from the inclination along the involute curve to the radial direction from the origin of the insulating substrate 7 to the outer diameter from the inclination along the involute curve. To extend to the outer diameter side end of the insulating substrate 7. The position of the point 8P is
From the 200-degree to 240-degree and the 260-degree to 300-degree inner diameter side points forming the lower pattern of the back side of
Each point on the outer diameter side shifted by 60 degrees (260 to 300
Half-coil piece 8 going from the point of 320 degrees to the point of 320 degrees)
b (for example, the half-coil piece 8a on the front surface going from the inner-diameter point 310 degrees to the outer-diameter point 250 degrees, and the back-surface piece going from the inner-diameter point 200 degrees to the outer-diameter point 260 degrees). (The position where the half coil piece 8b overlaps). At the outer diameter end and the inner diameter end of the half coil piece 8a, connection terminal portions 8OC (outer diameter side) and 8IC (inner diameter side) slightly protruding in the normal direction from the outer diameter and inner diameter of the insulating substrate 7 are provided. ) Are provided. Lower pattern 8L on the back side of insulating substrate 7
Is a pattern symmetrical with respect to the upper pattern 8U on the front side and the straight line AA ′. Therefore, as the winding pattern 8E of the excitation winding 5C, two upper patterns 8U are prepared, and one of them is turned upside down symmetrically with respect to the straight line AA '(the lower pattern 8L), and the insulating substrate 7 is sandwiched therebetween. It can be made cheaply by superimposing.

When the upper pattern 8U and the lower pattern 8L are overlapped in the above positional relationship, all the connection terminals 8IC on the inner diameter side and the two connection terminals 8 ° located at 0 ° and 300 ° on the outer diameter side of the upper pattern 8U. Connection terminal 8OC and two connection terminals 8OC located at 310 ° and 250 ° of lower pattern 8L
Except for the rest, they all overlap. Connection terminal 8IC (inner diameter side), 8OC (outer diameter side) where inner diameter side and outer diameter side overlap
Are all electrically connected. Also, the lower pattern 8L
The connection terminals 8OC located at 310 degrees and 250 degrees are electrically connected via a jumper 81. The connection terminal 8OC located at 0 degrees on the outer diameter side of the upper pattern 8U is connected to the + terminal of the coil 2C on the secondary side T2 of the rotary transformer by a lead L, and the connection terminal 8OC located at 300 degrees.
Is connected to the-terminal. When, for example, a sine wave excitation current is supplied to the connection terminal 8OC located at 0 degrees on the outer diameter side of the upper pattern 8U, the current flows in the direction of the arrow, and the half coil piece 8a of the upper pattern 8U extends to 60 degrees on the inner diameter side. Along
8L lower pattern from 60 degrees inside diameter to 120 degrees outside diameter
A current flows along the half coil piece 8b. In the same manner, the current is changed to 120 degrees on the outer diameter side, 180 degrees on the inner diameter side, and 2 degrees on the outer diameter side.
The half-coil pieces 8a of the upper pattern 8U and the half-coil pieces 8b of the lower pattern 8L, which connect points at 40 degrees and 300 degrees on the inner diameter side, alternately flow. The outer diameter portions of the half coil piece 8b connecting the point of 300 degrees on the inner diameter side to 0 degrees on the outer diameter side and the half coil piece 8a connecting the points of 350 degrees on the outer diameter side and 50 degrees on the inner diameter side are as described above. As described above, the inclination of the coil pieces changes from the point 8P where they overlap with each other, and the coil pieces are connected by the connection terminal portion 8OC provided at the outer diameter side end. Therefore, the current does not return to the point of 0 degree on the outer diameter side, but flows through the half coil piece 8a connecting the point of 350 degrees on the outer diameter side and the point of 50 degrees on the inner diameter side shifted by 10 degrees in the counterclockwise direction. Up to the point 8P described above constitutes one petal-shaped turn. In the same manner, 6 turns connecting up to a half coil piece 8b connecting a point between the inner diameter side 250 degrees and the outer diameter side 310 degrees on the back surface are defined as one unit to constitute the θ phase.

On the other hand, a connection terminal portion 8OC provided at the outer diameter side end of the half coil piece 8b connecting the point at the inner diameter side of 250 degrees and the outer diameter side at 310 degrees is connected to the outer diameter side via a jumper 81 on the back surface. Half-coil piece 8 connecting 250 degrees and a point at 190 degrees on the inner diameter side
b. It is connected to the connection terminal portion 8OC. Here, the direction of the current is reversed. From the inner diameter side of 190 degrees to the outer diameter side of 130 degrees, the current flows through the half coil piece 8a of the upper pattern 8U.
, The half-coil pieces 8a, 8b connecting the points on the outer diameter side 10 degrees and the inner diameter side 310 degrees alternately flow. A half-coil piece 8a connecting a point between the inner diameter side 310 degrees and the outer diameter side 250 degrees;
As described above, the inclination of the coil piece changes from the point 8P where it overlaps with the half coil piece 8b connecting the point of 0 degree and the point of 200 degrees on the inner diameter side, and is provided at the outer diameter end. Are connected by the connection terminal section 80C. Therefore, the current does not return to the point at 250 degrees on the outer diameter side,
The half-coil piece 8b connecting the point of 260 ° on the outer diameter side and the point of 320 ° on the inner diameter side shifted by 0 ° flows.
Up to P constitutes one petal-shaped turn. Similarly, on the surface, the inner side is 0 degree and the secondary side T of the rotary transformer is
The six turns connecting the half coil piece 8a connecting the negative terminal of the second coil 2C to the point on the outer diameter side connected by the lead L to the 300 ° outside diameter are defined as one unit, and constitute the θ ′ phase. As described above, for example, when a sine wave excitation current is supplied from the 0 degree point on the outer diameter side to the excitation winding 5c, the current flows in the direction of the arrow and the polarity of the magnetic pole alternates at a mechanical angle pitch of 60 degrees. Then, one-phase three-pole magnetic poles having a phase difference of 180 degrees in electrical angle are generated.

The winding pattern 8D of the detection winding 6C is shown in FIG.
As shown in (b), the upper pattern 8U is provided on the front side and the lower pattern 8L is provided on the back side with the insulating substrate 7 interposed therebetween. The upper pattern 8U on the front side of the insulating substrate 7
A point on the inner diameter side and a point on the outer diameter side shifted by 0 degrees (= 360 degrees / (2 * 3 pole pairs)) (for example, a point on the inner diameter side 0 degrees and a point on the outer diameter side shifted 60 degrees counterclockwise counterclockwise) And the half coil pieces 8a connected by a good conductor by an involute curve are arranged in parallel at equal intervals of 10 degrees with respect to the origin of the insulating substrate 7. 250 degrees, 260 degrees, 310 degrees, 32
Outer diameter points (1) shifted from the inner diameter points located at 0, 340, 350, 40, and 50 degrees by 60 degrees, respectively.
90 degrees, 200 degrees, 250 degrees, 260 degrees, 280 degrees, 2
(A point of 90 degrees, 340 degrees, and 350 degrees), the point of the half coil piece 8a is shifted from the origin of the insulating substrate 7 at the point 8P provided on the outer diameter side from the inclination along the involute curve. The diameter is changed to a radially inclined shape, and the shape extends to the outer diameter side end of the insulating substrate 7. Point 8P
Are 140 degrees, 150 degrees, 200 degrees, 210 degrees, 230 degrees, which constitute the lower pattern on the back surface side of the insulating substrate 7.
Outer diameter points (200 °, 21 °) which are respectively shifted by 60 ° from inner diameter points located at 240 °, 290 °, and 300 °
0, 260, 270, 290, 300, 35
The position where the half coil piece 8b toward the 0 °, 0 ° point overlaps (for example, the half coil piece 8a on the surface from the inner diameter point 50 ° to the outer diameter point 350 ° and the inner diameter point 310). (The position where the half-coil piece 8b on the back surface goes from the degree to the point 0 degree on the outer diameter side). Connection terminal portions 8OC (outer diameter side) slightly protruding in the normal direction from the outer diameter and inner diameter of the insulating substrate 7 are provided at the outer diameter side end and the inner diameter side end of the half coil piece 8a.
Eight ICs (inner diameter side) are provided. The lower pattern 8L on the back side of the insulating substrate 7 is a pattern that is line-symmetric with the upper pattern 8U on the front side with respect to the straight line AA ′.
Therefore, as the winding pattern 8E of the excitation winding 5C, two upper patterns 8U are prepared, and one of them is turned upside down symmetrically with respect to the straight line AA '(the lower pattern 8L), and the insulating substrate 7 is sandwiched therebetween. It can be made cheaply by superimposing.
When the upper pattern 8U and the lower pattern 8L are overlapped with each other in the above-described positional relationship, all of the connection terminal portions 8IC on the inner diameter side,
Outer diameter side of upper pattern 8U 0 degree, 300 degree 270 degree, 21
The rest of the lower pattern 8L except for the four connection terminals 8OC at the positions of 340, 280, 250, and 190 degrees overlaps with the four connection terminals 8OC at the position of 0 degree. Connection terminal 8IC where inner and outer diameters overlap
(Inner diameter side) and 8OC (outer diameter side) are all electrically connected. In addition, 340 degrees and 280 degrees of the lower pattern 8L,
And connection terminals 8OC located at 250 and 190 degrees
Are electrically connected via a jumper 81.

The connection terminal 8OC located at 0 degrees on the outer diameter side of the upper pattern 8U is connected to the + terminal of the α phase, and the connection terminal 8OC located at 300 degrees is connected to the-terminal. The connection terminal 8OC located 270 degrees on the outer diameter side of the upper pattern 8U.
Is the + terminal of the β phase, the connection terminal 8OC located at 210 degrees.
Is connected to the-terminal. From the connection terminal 8OC located at 0 degree on the outer diameter side of the upper pattern 8U to the connection terminal 8 of the half coil piece 8b located at 340 degrees on the outer diameter side of the lower pattern 8L.
Up to OC, one petal-shaped turn was made in series 3
The unit is composed and the α phase is made. Further, as described above, the connection terminal portion 8OC of the half coil piece 8b located at 340 degrees on the outer diameter side is connected to the connection terminal 8OC of the half coil piece 8b located at 280 degrees via the jumper 81 on the back surface. Up to the connection terminal portion 8OC of the half-coil piece 8a located at 300 degrees on the outer diameter side of 8U, one unit in which three petal-shaped turns are formed in series constitutes an α 'phase. From the connection terminal 8OC located on the outer diameter side 270 degrees of the upper pattern 8U to the connection terminal 8OC of the half coil piece 8b located on the outer diameter side 250 degrees of the lower pattern 8L, three petal-shaped turns are connected in series. One unit is made up to make the β phase. Further, as described above, the outer diameter side 2
The connection terminal portion 8OC of the half-coil piece 8b located at 50 degrees is connected to the connection terminal 8OC of the half-coil piece 8b located at 190 degrees via a jumper 81 on the back surface.
Up to the connection terminal portion 8OC of the half-coil piece 8a located 210 degrees on the outer diameter side of U, one unit in which three petal-shaped turns are formed in series constitutes a β ′ phase. As described above, three poles are formed in the detection winding 6c at a mechanical angle of 60 degrees (180 degrees in electrical angle), a current is induced in the direction of the arrow, and an α phase is formed. α phase and mechanical angle 3
At a position shifted by 0 °, a mechanical angle of 60 ° pitch (1 electrical angle)
(80 degrees), a triode is formed, a current is induced in the direction of the arrow, and a β phase is formed.

FIG. 4 is an explanatory view showing a method of manufacturing a winding. The upper pattern 8U having an inner diameter smaller than the insulating substrate 7 and a larger outer diameter has a half coil piece 8a formed on the lower surface of the insulating film 6, and connection terminals 8ci and 8co are provided on the inner and outer diameters. The lower pattern 8L has the same configuration as the upper pattern 8U. After the upper pattern 8U and the lower pattern 8L are superimposed on the insulating substrate 7 and pressed from above and below at the inner and outer diameter portions, each of the connection terminals 8IC and 8OC is joined by a laser or the like.
The insulating film 61 is coated. FIG. 5 shows a winding pattern of the second embodiment. The half coil pieces 8a and 8b of the embodiment are connected by a straight line. In this case, the pattern is easily formed, but the adjacent half-coil pieces 8a and 8b interfere with each other on the inner diameter side, so that a fine pitch cannot be obtained.

[0013]

As described above, according to the present invention, the following effects can be obtained. 1. Since the winding is attached to the core surface, slot ripple does not occur. 2. Since the winding pattern is formed by thin film generation technology,
Windings can be manufactured with a fine pitch and high accuracy, and high resolution and high accuracy can be realized. 3. Since the excitation winding and the detection winding are made thin, inertia is reduced. 4. In the embodiment, the half coil pieces are connected by an involute curve, and a small diameter piece can be formed without interference between the half coil pieces. 5. In the second embodiment, since the half-coil pieces are connected by a straight line, it is easy to manufacture a pattern, which is suitable for a large-diameter one.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a resolver showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a signal generation unit of the present invention.

FIG. 3 is a plan view showing patterns of (a) excitation and (b) a detection winding of the present invention.

FIG. 4 is an explanatory view showing a method for manufacturing a winding according to the present invention.

FIG. 5 is a plan view showing a pattern of (a) excitation and (b) a detection winding, showing a second embodiment of the present invention.

[Explanation of symbols]

 1a Primary core 1c Primary coil 2a Secondary core 2c Secondary coil 3 Rotating shaft 4 Casing 5a Rotor core 5c Excitation winding 6, 61 Insulating film 6a Stator core 6c Detection winding 7 Insulating substrate 8, 8E, 8D Winding pattern 8a , 8b Half coil piece 8U Upper pattern 8L Lower pattern 8IC, 8OC Connection terminal 81, 82 Jumper L Lead wire T Rotary transformer T1 Primary side of rotary transformer T2 Secondary side of rotary transformer

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryuichiro Tominaga 2-1 Kurosaki Castle Stone, Yawatanishi-ku, Kitakyushu City, Fukuoka Prefecture Inspector, Yaskawa Electric Corporation Inspector Masahiro Inoue (56) References JP-A-61-169715 (JP, A) JP-A-1-126142 (JP, A) JP-A-3-150052 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01D 5/00-5/62 H02K 24 / 00 G01B 7/00-7/34

Claims (3)

(57) [Claims] 1. A primary core (1a) and a primary coil (1c).
And a rotary transformer (T) including a secondary core (2a) and a secondary coil (2c), and an axial gap resolver including a signal generating unit including a rotor core, an excitation winding, and a stator core and a detection winding. The stator core is a disk-shaped rotor core (5a) and a stator core (6a), and a plurality of half-coil pieces formed on both surfaces of a disk-shaped insulating substrate with the excitation winding and the detection winding are arranged in parallel from the outer circumference to the inner circumference. An excitation winding (5c) and a detection winding (6c) having a winding pattern (8) electrically connected to the front and back half-coil pieces (8a, 8b) are provided on the surface of the rotor core (5a). (5c), the detection winding (6c) is attached to the surface of the stator core (6a), and the excitation winding (5c) and the detection winding (6c) are attached.
An axial gap resolver characterized in that c) faces each other via a gap in the axial direction. 2. The axial gap resolver according to claim 1, wherein said winding pattern is formed by an involute curve. 3. The axial gap resolver according to claim 1, wherein said winding pattern is formed by a straight line.