JP5091837B2 - Resolver - Google Patents

Description

  The present invention relates to a resolver used for detecting a rotation angle of an output shaft of an automobile motor.

High-power brushless motors are used in hybrid vehicles and electric vehicles, and higher power is expected in the future. In order to control a brushless motor of a hybrid vehicle, it is necessary to accurately grasp the rotation angle of the output shaft of the motor. This is because it is necessary to accurately grasp the rotational position of the rotor in order to control energization switching to each coil of the stator.
For this reason, it is desirable that the motor is provided with a resolver to accurately detect the angle. A resolver used in a drive mechanism of an automobile is required to have high accuracy because the rotational speed of the drive mechanism is high in addition to environmental resistance. As with other in-vehicle components, the resolver is required to be downsized and cost-effective.

In order to improve the accuracy of the resolver, a method employing a skew as disclosed in Patent Document 1 can be considered.
In Patent Document 1, as a method for preventing distortion of an output sine wave from a magnetic resolver, a method of changing a pitch between a rotor core and a stator core, and a skew method in which a stator core is inclined with respect to a rotor core are conventional techniques. It is disclosed.

On the other hand, in order to reduce the size of the resolver, it is known to form a printed circuit as disclosed in Patent Document 2.
In Patent Document 2, the pattern pitches in the arrangement direction of the sheet coils to be attached to the substrate are arranged at unequal pitches, thereby preventing harmonics from being added to the magnetomotive force waveform and improving the detection accuracy.

Japanese Patent Laid-Open No. 5-31590 JP 7-2111537 A

However, Patent Document 1 and Patent Document 2 have the following problems.
If the cost reduction of a resolver is considered, it is not preferable to use a winding coil. In the manufacturing process, it is difficult to reduce the cost because a winding process is absolutely necessary.
When the winding is used, the process of winding the bobbin, the process of assembling the coil, and the like increase, and the number of parts of the resolver increases, which hinders cost reduction. Moreover, since a certain thickness is required for the coil, it is difficult to reduce the thickness.

On the other hand, if the configuration disclosed in Patent Document 2 is adopted, the sheet coil can be used to reduce the thickness. However, in order to form the sheet coil, a printed pattern is formed on a copper plate provided on the substrate. In many cases, after drawing, etching is performed to form a necessary pattern, and an insulating layer is formed thereon. In order to obtain a multilayer coil, the substrates are bonded together later.
Thus, since a plurality of processes are required, it is difficult to reduce the cost.

  Accordingly, an object of the present invention is to provide a resolver that is thin and can be reduced in cost in order to solve such problems.

In order to achieve the above object, the resolver according to the present invention has the following characteristics.
(1) A disk-shaped rotor provided with a planarly formed tertiary coil and a planarly formed rotor-side rotary transformer coil; A flat plate provided with a stator-side rotary transformer coil formed in a flat shape and a primary coil formed in a flat shape and a secondary coil formed in a flat shape and provided with a sine wave. A resolver composed of a stator and
The primary coil and the secondary coil are installed to face the tertiary coil, the stator-side rotary transformer coil is provided to face the rotor-side rotary transformer coil, and the primary coil and the secondary coil An insulating layer using an insulating paint is provided between the rotor, a rotor back core made of a magnetic material at a position corresponding to the tertiary coil, and a rotary at a position corresponding to the rotor-side rotary transformer coil. A transformer back core is provided, and the rotor back core and the rotary transformer back core are provided separately from each other in the radial direction of the rotor .

(2) In (1) Symbol placement of the resolver,
The stator includes a stator back core made of a magnetic material corresponding to the primary coil and the secondary coil.

( 3 ) In the resolver according to ( 1 ) or ( 2 ),
The rotor back core is insert-molded in the rotor body, or the stator back core is insert-molded in the stator body.

( 4 ) In the resolver according to any one of (1) to ( 3 ),
A rotor mounting portion for fixing the rotor is provided in a body of the rotor, and the tertiary coil is formed using a conductive paint with reference to the rotor mounting portion.

( 5 ) In the resolver according to any one of (1) to ( 4 ),
A stator mounting portion for fixing the stator is provided on a body of the stator, and the primary coil or the secondary coil is formed using conductive paint with the stator mounting portion as a reference.

( 6 ) In the resolver according to any one of (1) to ( 5 ),
At least one of the body of the rotor and the body of the stator is formed using an insulating resin material.

With the resolver according to the present invention having such characteristics, the following actions and effects can be obtained.
First, the invention described in (1) is a disk-shaped rotor provided with a planarly formed tertiary coil and a planarly formed rotor-side rotary transformer coil , and concentric with the rotor in the axial direction. A stator-side rotary formed by laminating a flat primary coil provided with a cosine wave and a flat secondary coil provided with a sine wave , and further formed in a flat form In a resolver composed of a flat stator provided with a transformer coil , a primary coil and a secondary coil are installed facing the tertiary coil, and the stator-side rotary transformer facing the rotor-side rotary transformer coil. A coil is provided, an insulating layer using an insulating paint is provided between the primary coil and the secondary coil, and the rotor has magnetism at a position corresponding to the tertiary coil. Rotor back core made of material and a rotary transformer back core are provided at positions corresponding to the rotor side rotary transformer coil, and the rotor back core and the rotary transformer back core are provided separately from each other in the radial direction of the rotor. It is.

A primary coil to which a cosine wave is applied as an exciting coil and a secondary coil to which a sine wave is applied are formed to overlap each other, and an insulating layer that needs to be formed between the primary coil and the secondary coil is insulated. It is possible to reduce the cost by forming using a conductive paint.
For example, an insulating paint is drawn as an insulating layer by an ink jet method and baked to form the insulating layer. By forming the insulating layer in this manner, a thin resolver can be formed, and the number of steps can be reduced to reduce the cost.

The invention described in ( 2 ) is the resolver described in ( 1 ), wherein the stator includes a stator back core made of a material having magnetism corresponding to the primary coil and the secondary coil.

The printed coil as shown in Patent Document 2 can be formed thin, but the cross-sectional area of the circuit is reduced, so that the amount of current that can be passed is reduced. As a result, there is a problem that the detection accuracy of the resolver is lowered. This tendency becomes stronger as the size and thickness are reduced.
However, by providing the stator back core or the rotor back core, an efficient magnetic circuit can be formed even with a thin resolver, and the detection accuracy of the resolver can be improved. As a result, it is possible to provide a thin and accurate resolver.

The invention described in ( 3 ) is the resolver described in ( 1 ) or ( 2 ), wherein the rotor back core is inserted into the rotor body or the stator back core is inserted into the stator body.
A tertiary coil is formed on the rotor, and a primary coil and a secondary coil are formed on the stator. By forming the rotor back core or the stator back core on these using insert molding, the rotor and the stator can be easily formed. For this reason, it becomes possible to provide a thin resolver at low cost.

The invention described in ( 4 ) is the resolver described in any one of (1) to ( 3 ), wherein a rotor mounting portion for fixing the rotor is provided on the rotor body, and the rotor mounting portion is used as a reference. A tertiary coil is formed using a conductive paint.
The invention described in ( 5 ) is the resolver described in any one of (1) to ( 4 ), wherein a stator mounting portion for fixing the stator is provided on the stator body, and the stator mounting portion is used as a reference. A primary coil or a secondary coil is formed by using a conductive paint.

When a coil pattern is drawn by an inkjet method using a conductive paint, for example, a phase shift of the coil becomes a problem. However, it is possible to prevent a phase shift of the coil by providing the rotor mounting portion on the rotor body or by providing the stator mounting portion on the stator body and drawing the coil pattern based on them.
The rotor attachment portion is provided for attachment to the rotor of the motor, and the stator attachment portion is provided for attachment to a motor cover or the like. Such a mounting portion is necessary for mechanical positioning, and phase shift can be prevented by drawing a coil with reference to this mounting portion.

The invention described in ( 6 ) is the resolver described in any one of (1) to ( 5 ), wherein at least one of the rotor body and the stator body is formed using an insulating resin material. It is what.
The resolver can be formed at a lower cost by forming the rotor body or the stator body from an insulating resin.

Next, a first embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
First, the configuration of the first embodiment will be described.
FIG. 1 is a sectional view simply showing the structure of the motor of the first embodiment.
The motor 10 is a brushless motor including a case main body 11, a case cover 12, a motor stator 13, a motor rotor 14, a motor shaft 15, a motor bearing 16a, and a motor bearing 16b.
The case main body 11 and the case cover 12 are made by casting an aluminum alloy or the like. The case main body 11 is fitted with a motor bearing 16a. The case cover 12 is fitted with a motor bearing 16b. It is pivotally supported.

A motor stator 13 is fixed to the inner periphery of the case body 11. The motor stator 13 includes a coil and generates a magnetic force when energized.
On the other hand, a motor rotor 14 having a permanent magnet is fixed to the motor shaft 15. The motor stator 13 and the motor rotor 14 are held at a predetermined distance, and when the motor stator 13 is energized, the motor rotor 14 rotates and generates a driving force to transmit power to the motor shaft 15.
A magnetic shielding plate 17 is provided on the end face of the motor rotor 14. The motor rotor 14 is in contact with one end of the magnetic shielding plate 17 and the resolver rotor 20 is in contact with the other end.

A resolver stator 30 is fixed to the case cover 12, and the resolver rotor 20 and the resolver stator 30 are spaced apart by a predetermined distance G in a state where the case main body 11 and the case cover 12 are assembled. The closer the predetermined distance G is, the better the detection accuracy of the resolver 100 can be. However, the predetermined distance G is determined in consideration of dimensional tolerances, dimensional changes due to temperature, and the like.
FIG. 2 is a cross-sectional view schematically showing a cross section of the resolver. FIG. 3 shows the rotor side coil pattern of the resolver. FIG. 4 shows a coil pattern diagram on the stator side. FIG. 5A shows a simplified coil pattern diagram of the first coil of the exciting coil. FIG. 5B shows a simplified coil pattern diagram of the second coil of the exciting coil.
The resolver 100 includes a resolver rotor 20 and a resolver stator 30. The positional relationship between the resolver rotor 20 and the resolver stator 30 is arranged to be a predetermined distance G.

The resolver rotor 20 includes a rotor body 21 formed of LCP (Liquid Crystal Polymer) resin or PPS (Polyphenylene Sulfide) resin, and a detection coil 22 corresponding to a tertiary coil drawn by an inkjet method on the surface thereof.
The detection coil 22 includes a detection coil pattern 22A drawn using a conductive ink made of silver paste mixed with silver powder and a dispersant, etc., and an insulating layer 40 drawn using an insulating ink made of polyimide or the like. Consists of.
When the detection coil pattern 22A is drawn on the surface of the rotor body 21 with the conductive ink, the detection coil pattern 22A is drawn by applying the conductive ink with a thickness of about 10 to 20 μm, and then placed in a furnace and baked. By firing, the dispersant evaporates, and a silver thin film having a thickness of 2 to 5 μm is formed on the surface of the rotor body 21. The line width of the coil pattern is about 0.5 mm.

Then, after forming the detection coil pattern 22A, the insulating layer 40 is formed by an inkjet method. However, since the shape of the insulating layer 40 is not complicated, a method such as attaching a film or using screen printing may be employed.
The resolver rotor 20 includes a rotor-side rotary transformer 24. In the rotor-side rotary transformer 24, a rotary transformer pattern 24A is drawn using a conductive ink, and an insulating layer 40 is provided on the upper surface thereof.
The rotary transformer pattern 24A is also drawn in the same manner as the detection coil pattern 22A.

  Since the resolver 100 is 2 × in the detection coil pattern 22A, four coils of the first detection coil 22a, the second detection coil 22b, the third detection coil 22c, and the fourth detection coil 22d are connected in series, and further the rotary coil It is connected to the transformer pattern 24A. The connection is made by the first crossover line 28A, the second crossover line 28B, the third crossover line 28C, and the fourth crossover line 28D.

Specifically, the first detection coil 22a connected to the rotary transformer pattern 24A by the first crossover wire 28A is wound from the inner periphery toward the outer periphery and is connected to the second detection coil 22b. The second detection coil 22b is wound from the outer periphery toward the inner periphery, and is connected to the third detection coil 22c by the second jumper wire 28B and the third jumper wire 28C. The third detection coil 22c is wound from the inner periphery toward the outer periphery and is connected to the fourth detection coil 22d. The fourth detection coil 22d is wound from the outer periphery toward the inner periphery, and is connected to the rotary transformer pattern 24A by the fourth connecting wire 28D.
The first connecting wire 28A to the fourth connecting wire 28D are formed by burying conductive wires in the resolver rotor 20.

The resolver rotor 20 is provided with a detection coil back core 25 and a rotary transformer back core 26 that are insert-molded in the rotor body 21.
The detection coil back core 25 is formed by circularly arranging metal pieces corresponding to the detection coil 22 and having a width slightly smaller than the inner circumference of the detection coil pattern 22A shown in FIG.
The rotary transformer back core 26 is a donut-shaped metal piece formed in a slightly larger width than the rotary transformer pattern 24A as shown in FIG. It is necessary to use a material having magnetism as the material used for the back core, and for example, ferromagnetic materials such as iron, ferrite stainless steel, and resin containing iron powder are preferable.

  The resolver rotor 20 is provided with a rotor positioning pin hole 27. The holes are fitted with positioning pins 17A provided in a part of the magnetic shielding plate 17, and the detection coil pattern 22A and the rotary transformer pattern 24A are drawn with reference to the rotor positioning pin holes 27.

The resolver stator 30 includes a stator body 31 formed of LCP resin or PPS resin and an excitation coil 32 drawn on the surface of the stator body 31 by an ink jet method.
The exciting coil 32 includes a first exciting coil pattern 32A corresponding to a primary coil drawn using conductive ink and a second exciting coil pattern 32B corresponding to a secondary coil, and an insulating layer 40 drawn using insulating ink. Consists of.
The resolver stator 30 is provided with a stator-side rotary transformer 34. In the rotor-side rotary transformer 24, a rotary transformer pattern 34A is drawn using a conductive ink, and an insulating layer 40 is provided on the upper surface thereof.
Since the drawing method of the conductive ink and the insulating layer 40 is the same as that of the resolver rotor 20, the description thereof is omitted.

The exciting coil 32 includes a first exciting coil pattern 32A to which a cosine wave is supplied and a second exciting coil pattern 32B to which a sine wave is supplied. The first exciting coil pattern 32A of the first coil and the second exciting coil pattern 32B of the second coil are the same pattern, but are overlapped with an electrical angle being shifted by 90 °. An insulating layer 40 is provided between the first excitation coil pattern 32A and the second excitation coil pattern 32B. The first excitation coil pattern 32A, the second excitation coil pattern 32B, and the rotary transformer pattern 34A are connected to the circuit 38.
In addition, the resolver stator 30 includes an excitation coil back core 35 that is insert-molded in the stator body 31.

As shown in FIGS. 5A and 5B in which the first excitation coil pattern 32A and the second excitation coil pattern 32B are simplified, the resolver 100 is a 2 × resolver. And two S poles are provided alternately. The first exciting coil 32a connected to the circuit 38 is wound from the outside to the inside, and is connected to the second exciting coil 32b by the second connecting wire 37B connected to the first connecting wire 37A. The second excitation coil 32b is wound from the inside to the outside and is connected to the third excitation coil 32c. The third exciting coil 32c is wound from the outside to the inside, and is connected to the fourth exciting coil 32d by a fourth connecting wire connected to the third connecting wire 37C and the fourth connecting wire 37D. The fourth excitation coil 32d is wound from the inside to the outside and connected to the circuit 38.
The first connecting wire 37 </ b> A to the fourth connecting wire 37 </ b> D are formed by burying conductive wires in the resolver rotor 20.

Since the second excitation coil pattern 32B is also connected in the same pattern, description thereof is omitted.
The resolver stator 30 is provided with a stator positioning pin hole 39. The stator positioning pin hole 39 is a hole into which the positioning pin 17B provided on the case cover 12 is fitted. The first excitation coil pattern 32A, the second excitation coil pattern 32B, and the rotary transformer pattern 34A are drawn based on the stator positioning pin hole 39.

FIG. 6 is a block diagram showing resolver position detection control.
The motor 10 includes a circuit 38 and a sensor unit 50. The circuit 38 includes a sine wave generator 41, a high frequency generator 42, a cosine wave generator 43, a first modulator 44, a second modulator 45, a detector 46, and a phase difference detector 47. The sensor unit 50 includes an excitation coil 32, a detection coil 22, a rotor-side rotary transformer 24, and a stator-side rotary transformer 34.
A sine wave generator 41 for generating a 7.2 kHz sine wave is connected to the second modulator 45 as shown in FIG. A cosine wave generator 43 that generates a cosine wave of 7.2 kHz is connected to the second modulator 45.

A high frequency generator 42 that generates a 360 kHz sine wave is connected to the first modulator 44 and the second modulator 45. The sine wave generator 41 and the cosine wave generator 43 are connected to a phase difference detector 47. The detector 46 is connected to a phase difference detector 47.
The first modulator 44 is connected to the first excitation coil pattern 32A, and the second modulator 45 is connected to the second excitation coil pattern 32B.
The detection coil 22 is connected to the rotor-side rotary transformer 24, and the stator-side rotary transformer 34 is connected to the detector 46.

Since 1st Embodiment is the said structure, there exists an effect | action and effect which are demonstrated below.
First, the thin and inexpensive resolver 100 can be provided.
The resolver 100 according to the first embodiment is provided with a disk-shaped resolver rotor 20 provided with a detection coil pattern 22A formed in a planar shape, and is disposed concentrically with the resolver rotor 20 in the axial direction to form a planar shape. And a resolver stator 30 formed by laminating a first excitation coil pattern 32A to which a cosine wave is applied and a second excitation coil pattern 32B which is formed in a planar shape and to which a sine wave is applied. In FIG. 100, a first excitation coil pattern 32A and a second excitation coil pattern 32B are installed facing the detection coil pattern 22A, and an insulating paint is used between the first excitation coil pattern 32A and the second excitation coil pattern 32B. An insulating layer 40 is provided.

Unlike the conventional method, the insulating layer 40 is formed using an insulating ink. Conventionally, since a printed circuit board or a sheet type printed circuit board was used, a certain thickness was required. For example, a sheet-type printed board has a thickness of about 0.1 to 1.6 mm. On the other hand, the insulating layer 40 formed of insulating ink has a thickness of about 2 to 10 μm, and the insulating layer 40 can be formed thinner than before. Since the insulation performance is satisfied with this thickness, the thickness of the insulating layer 40 can be reduced.
As a result, the distance change of the opposing position (about 0.3 to 1 mm) between the detection coil pattern 22A, the first excitation coil pattern 32A, and the second excitation coil pattern 32B is reduced, which can contribute to detecting an accurate angle. .

  Moreover, since the insulating layer 40 is formed of insulating ink, it can be formed in a shorter time than a method that requires multiple etchings such as a printed circuit board, and the cost of the material can be reduced. Contributes to cost reduction.

Next, by providing the detection coil back core 25, the effect of strengthening the magnetic flux of the detection coil 22 can be obtained.
The resolver 100 of 1st Embodiment is provided with the detection coil back core 25 which consists of a substance which has the magnetism corresponding to the detection coil pattern 22A in the resolver rotor 20, and the 1st excitation coil pattern 32A and the 1st excitation coil are formed in the resolver stator 30. An exciting coil back core 35 made of a magnetic material corresponding to the coil pattern 32A is provided.

By providing the detection coil back core 25 on the resolver rotor 20 and the excitation coil back core 35 on the resolver stator 30, it is formed between the detection coil pattern 22A and the first excitation coil pattern 32A and the second excitation coil pattern 32B. The air gap is reduced, and the magnetic flux in the magnetic circuit can be increased.
Sheet type resolvers often have accuracy problems due to the small amount of current that can flow. In particular, when the detection coil 22, the excitation coil 32, the rotor-side rotary transformer 24, and the stator-side rotary transformer 34 are drawn by an ink jet method, the circuit cross-sectional area becomes small.

For this reason, there is a problem that the amount of current that can be passed through the circuit is reduced, and the accuracy of the resolver 100 is deteriorated as the strength of the magnetic flux decreases. However, by providing the detection coil back core 25, the excitation coil back core 35, and the rotary transformer back core 26, it is possible to reinforce the magnetic flux generated by each circuit and form an efficient magnetic circuit.
By enhancing the magnetic flux, the detection accuracy of the resolver 100 is also improved. There is a merit in the present situation where the resolver 100 is required to be thin and small.

Next, it is possible to reduce the cost of the resolver 100 by insert-molding the detection coil back core 25 and the excitation coil back core 35 into the rotor body 21 or the stator body 31.
The resolver 100 according to the first embodiment is formed by insert molding the detection coil back core 25 into the rotor body 21 of the resolver rotor 20 or the excitation coil back core 35 into the stator body 31 of the resolver stator 30.
By adopting insert molding, the detection coil back core 25 and the excitation coil back core 35 can be easily held inside the rotor body 21 or the stator body 31, which contributes to cost reduction.

Next, since the detection coil pattern 22A or the first excitation coil pattern 32A and the second excitation coil pattern 32B are drawn with conductive ink, the resolver 100 can be provided at low cost.
In the resolver 100 of the first embodiment, a rotor positioning pin hole 27 for fixing the resolver rotor 20 is provided in the rotor body 21 of the resolver rotor 20, and the detection coil pattern 22 </ b> A is formed using conductive paint with the rotor positioning pin hole 27 as a reference. Is formed. Further, a stator positioning pin hole 39 for fixing the resolver stator 30 is provided in the stator body 31 of the resolver stator 30, and the first excitation coil pattern 32A or the second excitation coil pattern is formed using conductive paint with the stator positioning pin hole 39 as a reference. 32B is formed.

By forming the coil pattern of the resolver rotor 20 and the resolver stator 30 with conductive ink and insulating ink, the thickness can be reduced and the number of processes can be reduced because etching is not required unlike a printed coil. Can do.
In addition, the detection coil pattern 22A, the first excitation coil pattern 32A, and the second excitation coil pattern 32B are formed in the motor 10 with reference to the attachment reference portion such as the rotor positioning pin hole 27 and the stator positioning pin hole 39. When the resolver 100 is attached, attachment angle errors are unlikely to occur.
Therefore, the detection accuracy of the resolver 100 can be improved.

Next, it is possible to reduce the cost of the resolver 100 by making the rotor body 21 and the stator body 31 from resin.
At least one of the rotor body 21 of the resolver rotor 20 or the stator body 31 of the resolver stator 30 is formed using an insulating resin material.
Therefore, insert molding of the back core becomes easy, and improvement in water resistance and oil resistance can be expected. The motor 10 and the resolver 100 often use oil for cooling when used as power for a vehicle. For this reason, the resolver 100 that may be oiled is also required to have oil resistance.

Next, a second embodiment of the present invention will be described.
(Second Embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the first embodiment, and the way of forming the first crossover line 28A to the fourth crossover line 28D and the first crossover line 37A to the fourth crossover line 37D is different. Only different parts will be described below.
FIG. 7 shows a cross-sectional view of the resolver of the second embodiment.
The resolver rotor 20 includes a detection coil 22 and a rotor-side rotary transformer 24. After the first jumper wire 28A to the fourth jumper wire 28D are drawn, an insulating layer 40 is provided, on which the detection coil pattern 22A and the rotary coil rotor 22 are arranged. The insulating layer 40 is provided after the transformer pattern 24A is drawn.

  The resolver stator 30 includes an exciting coil 32 and a stator-side rotary transformer 34. After the connecting wire 37A to the fourth connecting wire 37D are drawn, an insulating layer 40 is provided, on which the first exciting coil pattern 32A and the rotary coil 30A are arranged. A transformer pattern 34A is drawn, an insulating layer 40 is provided thereon, a jumper line 37A to a fourth jumper line 37D are drawn thereon, an insulating layer 40 is provided thereon, and a second excitation coil pattern 32B is drawn thereon. The insulating layer 40 is provided thereon.

Since 2nd Embodiment has the said structure, there exists an effect | action shown below and an effect.
Detection coil pattern 22A, rotary transformer pattern 24A, first exciting coil pattern 32A, second exciting coil pattern 32B, stator-side rotary transformer 34, first connecting wire 28A to fourth connecting wire 28D, and connecting wire 37A to fourth connecting device Each of the lines 37D is drawn using a conductive ink by an ink jet method, and the insulating layer 40 is drawn using an insulating ink by an ink jet method.
Therefore, the resolver 100 having a multilayer structure can be easily formed, and the cost can be reduced as compared with a printed circuit board or the like.

Next, a third embodiment of the present invention will be described.
(Third embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the first embodiment, but the fixing method of the resolver rotor 20 is different.
FIG. 8 shows a cross-sectional view of a motor according to the third embodiment.
In the resolver 100 of 3rd Embodiment, the stopper 60 is employ | adopted as the attachment method of the resolver rotor 20. As shown in FIG.
The stopper 60 includes a crimping portion 60a in a direction opposite to the contact portion with the stepped portion of the motor shaft 15. After the magnetic shielding plate 17 is inserted into the end portion of the motor rotor 14, the resolver rotor 20 is attached to the magnetic shielding plate 17, the stopper 60 is inserted, and the crimping portion 60a is expanded and crimped. Since the stopper 60 is pressed into the magnetic shielding plate 17, the resolver rotor 20 is fixed to the magnetic shielding plate 17.

Next, a fourth embodiment of the present invention will be described.
(Fourth embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the first embodiment, but the fixing method of the resolver rotor 20 is different.
FIG. 9 shows a sectional view of the motor of the fourth embodiment.
In the resolver 100 of the fourth embodiment, the press-fitting member 62 is adopted as a method for attaching the resolver rotor 20. The press-fitting member 62 includes a flange portion 62a and a shaft portion 62b, and the resolver rotor 20 can be held by the flange portion 62a by being press-fitted into the magnetic shielding plate 17.

Next, a fifth embodiment of the present invention will be described.
(Fifth embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the first embodiment, but the fixing method of the resolver rotor 20 is different.
FIG. 10 shows a sectional view of the motor of the fifth embodiment.
In the resolver 100 of the fifth embodiment, as a method of attaching the resolver rotor 20, the resolver rotor 20 is held on the inner periphery of the recess 17a by providing the magnetic shield plate 17 with the recess 17a, and the resolver rotor 20 is attached to the magnetic shield plate 17. Is fixed with an adhesive.
The adhesive used for bonding needs to be a member that can withstand the temperature rise of the motor 10 and can also withstand the oil used in the motor 10.

  By using the stopper 60 as in the third embodiment, using the press-fit member 62 as in the fourth embodiment, or providing the recess 17a in the magnetic shielding plate 17 as in the fifth embodiment, and easily The resolver rotor 20 can be positioned and held with respect to the magnetic shielding plate 17 at low cost.

Next, a sixth embodiment of the present invention will be described.
(Sixth embodiment)
The basic configuration is almost the same as that of the resolver 100 of the first embodiment, but the configuration of the mounting portion of the resolver stator 30 is different.
FIG. 11A shows a front view of the resolver stator of the sixth embodiment. FIG. 11B shows a cross-sectional view of the case cover portion. FIG.11 (b) shows AA sectional drawing of Fig.11 (a).
In the resolver stator 30 of the sixth embodiment, an alignment stopper 31 a is provided on the stator body 31. The alignment stopper 31a is a protrusion formed in an elliptical shape. When the resolver stator 30 is assembled to the case cover 12, the resolver stator 30 is inserted into the recess 12 a formed in the case cover 12.

The positioning stopper 31a is provided on the stator body 31, and the recess 12a is provided on the case cover 12, whereby the resolver stator 30 is positioned with respect to the case cover 12.
Further, the drawing of the first excitation coil pattern 32A, the second excitation coil pattern 32B, and the like on the resolver stator 30 is performed with reference to the alignment stopper 31a.
For this reason, the change in the mutual coil attachment angle between the resolver rotor 20 and the resolver stator 30 is reduced, and an accurate angle can be detected.

Next, a seventh embodiment of the present invention will be described.
(Seventh embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the seventh embodiment, but the configuration of the mounting portion of the resolver stator 30 is different.
FIG. 12A shows a front view of the resolver stator of the seventh embodiment. FIG. 12B shows a cross-sectional view of the case cover portion. FIG.12 (b) shows BB sectional drawing of Fig.12 (a).
The resolver stator 30 of the seventh embodiment is provided with positioning convex portions 31b, and one case cover 12 is provided with positioning concave portions 12b.

When the resolver stator 30 is assembled to the case cover 12, the positioning convex portion 31 b of the resolver stator 30 is inserted into the positioning concave portion 12 b formed in the case cover 12.
The positioning projection 31b is provided on the stator body 31 and the positioning recess 12b is provided on the case cover 12, whereby the resolver stator 30 is positioned with respect to the case cover 12.
Further, the drawing of the first excitation coil pattern 32A, the second excitation coil pattern 32B, and the like on the resolver stator 30 is performed with reference to the positioning convex portion 31b.
For this reason, the change in the mutual coil attachment angle between the resolver rotor 20 and the resolver stator 30 is reduced, and an accurate angle can be detected.

Next, an eighth embodiment of the present invention will be described.
(Eighth embodiment)
The basic configuration is substantially the same as that of the resolver 100 of the eighth embodiment, but the configuration of the mounting portion of the resolver stator 30 is different.
FIG. 13A shows a front view of the resolver stator of the seventh embodiment. FIG. 13B shows a cross-sectional view of the case cover portion. FIG.13 (b) shows CC sectional drawing of Fig.13 (a).
The resolver stator 30 of the eighth embodiment is provided with three screwing portions 31c. The screwing portion 31c is provided with the center of the mounting screw 55 assigned at 125 °, 125 °, and 110 °.

While the stator body 31 is provided with a screw fixing portion 31c, the case cover 12 is provided with a bolt hole (not shown) to which the attachment screw 55 is fastened, and the resolver stator 30 is fixed to the case cover 12 with a bolt by the mounting screw 55. To do.
By doing so, the position of the resolver stator 30 with respect to the case cover 12 is determined. Since the stator body 31 is not provided in equal splits, the mounting posture of the resolver stator 30 is determined, and an effect as positioning means is achieved.
Further, the first excitation coil pattern 32A and the second excitation coil pattern 32B are drawn on the resolver stator 30 with any one of the screwing portions 31c as a reference.
For this reason, the change in the mutual coil attachment angle between the resolver rotor 20 and the resolver stator 30 is reduced, and an accurate angle can be detected.

While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and can be appropriately modified and applied without departing from the scope of the invention.
For example, in the first to eighth embodiments, the constituent material of the motor 10 is shown, but the change of the material is not hindered.
Further, it is not impeded that the resolver 100 is used for purposes other than the position detection of the motor 10.
Moreover, it does not prevent using methods other than the fixing method of the resolver rotor 20 as shown in 1st Embodiment and 3rd Embodiment thru | or 5th Embodiment, 1st Embodiment and 6th Embodiment thru | or 8th Embodiment. Use of a method other than the fixing method of the resolver stator 30 as shown in the embodiment is not prevented.

It is sectional drawing which showed the structure of the motor of 1st Embodiment simply. It is sectional drawing which represented typically the cross section of the resolver of 1st Embodiment. It is a rotor side coil pattern of a resolver of 1st Embodiment. It is a coil pattern figure by the side of the stator of 1st Embodiment. (A) It is the coil pattern figure which simplified the 1st coil of the exciting coil of 1st Embodiment. (B) It is the coil pattern figure which simplified the 2nd coil of the exciting coil of 1st Embodiment. It is a block diagram which shows position detection control of the resolver of 1st Embodiment. It is sectional drawing of the resolver of 2nd Embodiment. It is sectional drawing of the motor of 3rd Embodiment. It is sectional drawing of the motor of 4th Embodiment. It is sectional drawing of the motor of 5th Embodiment. (A) It is a front view of the resolver stator of 6th Embodiment. (B) AA sectional view of a case cover part of a 6th embodiment is shown. (A) It is a front view of the resolver stator of 7th Embodiment. (B) BB sectional drawing of the case cover part of 7th Embodiment is shown. (A) It is a front view of the resolver stator of 8th Embodiment. (B) CC sectional drawing of the case cover part of 8th Embodiment is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor 11 Case main body 12 Case cover 13 Motor stator 14 Motor rotor 15 Motor shaft 16a Motor bearing 16b Motor bearing 17 Magnetic shielding plate 17A Positioning pin 17B Positioning pin 17a Recess 20 Resolver rotor 21 Rotor body 22 Detection coil 22A Detection coil pattern 24 Rotor side Rotary transformer 24A Rotary transformer pattern 25 Detection coil back core 26 Rotary transformer back core 27 Rotor positioning pin hole 28A First connecting wire 28B Second connecting wire 28C Third connecting wire 28D Fourth connecting wire 30 Resolver stator 31 Stator body 32 Excitation coil 32A First excitation coil pattern 32B Second excitation coil pattern 34 Stator-side rotary transformer 34A Rotary transformer pattern 35 Excitation coil back cover 37A first connecting wire 37B second connecting wire 37C third jumper wires 37D fourth connecting wire 38 circuit 39 stator positioning pin holes 40 insulating layer 60 stopper 60a caulking portion 62 press-fitted members 62a flange portion 62b shaft portion 100 resolver G predetermined distance

Claims (6)

A disk-shaped rotor provided with a planarly formed tertiary coil and a planarly formed rotor-side rotary transformer coil , and concentric with the rotor and disposed in the axial direction, is formed in a planar shape. A flat plate-shaped stator in which a primary coil that is applied with a cosine wave and a secondary coil that is formed in a planar shape and that is applied with a sine wave are stacked, and a stator-side rotary transformer coil formed in a planar shape is further provided. In a resolver composed of
The primary coil and the secondary coil are installed facing the tertiary coil,
The stator-side rotary transformer coil is provided facing the rotor-side rotary transformer coil,
An insulating layer using an insulating paint is provided between the primary coil and the secondary coil ,
The rotor is provided with a rotor back core made of a magnetic material at a position corresponding to the tertiary coil, and a rotary transformer back core at a position corresponding to the rotor-side rotary transformer coil. The resolver according to claim 1, wherein the rotary transformer back core is provided separately from each other in a radial direction of the rotor . The resolver according to claim 1 , wherein
A resolver comprising a stator back core made of a material having magnetism corresponding to the primary coil and the secondary coil. The resolver according to claim 1 or claim 2 ,
A resolver, wherein the rotor back core is insert-molded in the rotor body or the stator back core is insert-molded in the stator body. The resolver according to any one of claims 1 to 3 ,
A resolver, wherein a rotor mounting portion for fixing the rotor is provided on a body of the rotor, and the tertiary coil is formed using a conductive paint with the rotor mounting portion as a reference. The resolver according to any one of claims 1 to 4 ,
A resolver, wherein a stator mounting portion for fixing the stator is provided on a body of the stator, and the primary coil or the secondary coil is formed using a conductive paint with the stator mounting portion as a reference. The resolver according to any one of claims 1 to 5 ,
At least one of the rotor body and the stator body is formed using an insulating resin material.

Images