JP4845236B2 - Resolver for automobile drive motor - Google Patents

Description

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

Conventionally, high output brushless motors are used in hybrid vehicles and electric vehicles. 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. In particular, in an automobile, since cogging deteriorates drivability, there is a demand for reducing the cogging, and thus there is a strong demand for accurately switching energization.
For detecting the motor shaft of an automobile, a resolver is used to satisfy functions such as high temperature resistance, noise resistance, vibration resistance, and high humidity resistance. The resolver is incorporated in the motor and is directly attached to the rotor shaft of the motor.
A variable reluctance resolver (VR resolver) is used as this type of resolver. The VR type resolver is a resolver that utilizes the fact that the efficiency of the transformer changes due to the variation of the gap provided in the magnetic path. By setting the shape of the rotor so that the gap periodically changes with respect to the rotation angle, the angle output can be detected without a winding on the rotor side.

The VR resolver has a stator in which an excitation coil and a detection coil are arranged, and a rotor in which an outer peripheral surface is arranged in proximity to both coils. The detection coil is composed of two coils whose phases are shifted by 90 degrees. A sine wave alternating current of several KHz is applied to the exciting coil. An induced voltage is output from the two coils of the detection coil via the outer peripheral surface of the rotor. The angle can be detected from the output amplitudes of the two induced voltages.
If the frequency of the sine wave applied to the exciting coil is increased, the number of windings can be reduced and the resolver can be reduced in size. However, if the frequency is increased, the electrical circuit for reading the rotation angle becomes complicated, and the detection accuracy is improved. There is a problem that stability decreases.
On the other hand, as a method for reducing the size of the resolver, a technique disclosed in Patent Document 1 has been proposed. That is, it is disclosed that a high frequency signal applied to an excitation coil is amplitude-modulated and a modulation signal in which the polarity of the high frequency signal is inverted at the polarity inversion position of the excitation signal is input. According to this, it is disclosed that the print pattern can be used as the excitation coil and the detection coil, so that the cost can be reduced.

JP 2000-292205 A

However, the resolver used in the conventional hybrid vehicle has the following problems.
(1) Since the VR type resolver uses an excitation signal having a frequency of several KHz, the number of windings is increased and the rotor is also robust, so that it is difficult to reduce the size of the resolver. was there. In the resolver described in Patent Document 1, the rotary transformer is constituted by a winding, and the rotary transformer is arranged in a direction parallel to the shaft center. There is a problem that it is difficult to reduce the size of the resolver used for the operation.

(2) A resolver used in a hybrid vehicle is incorporated in a motor and directly attached to a rotor shaft of the motor. The motor is filled with oil for cooling the motor, and the oil is lifted and dropped by the rotor rotating plate and the transmission, so that the resolver is used by being exposed to the oil. This is because a motor for driving an automobile is driven at a high voltage in order to produce a high output, and a lot of heat is generated by the winding coil.
The VR type resolver is less affected by oil because the movable part is only a metal rotor.
In the resolver described in Patent Document 1, an excitation coil and a detection coil are configured by a print pattern, and are attached to both the stator and the rotor. In particular, since the excitation coil or the detection coil attached to the rotor is strongly exposed to the oil flow that drops and flows by the rotation of the rotor rotating plate, high oil resistance is required.

First, the oil resistance required for the resolver is that the print pattern is not peeled off due to the force of the oil flow. This is because the resolver used in the motor of the hybrid vehicle receives strong force from the oil because it is used while the oil is dripping at a high speed where the peripheral speed of the rotor rotating plate exceeds about 80 m / sec.
Secondly, in the printed pattern, the copper foil, which is the conductor pattern, is bonded to the PCB (glass epoxy), which is a resin, with a blackened surface and bonded by the anchor effect. Due to the chemical action of the sulfur and oxides of the oil additives that reach a high temperature close to 150 degrees, the bonding strength may be reduced, and the printed pattern may be peeled off or the copper foil may be eroded.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a resolver having high durability used for a drive motor.

In order to solve the above problem, the resolver of the present invention has the following configuration.
(1) A rotor rotating plate that rotates together with the rotor shaft, a stator plate fixed to the stator, a pair of rotary transformers disposed opposite to the rotor rotating plate and the stator plate, and the rotor rotating plate And a stator coil, respectively, and a resolver for detecting the rotation angle of the rotor shaft, wherein (a) the rotor rotation plate and the stator plate are orthogonal to the rotor shaft The excitation coil and the detection coil are arranged to face each other on the opposing surface, (b) the excitation coil and the detection coil are formed by a print pattern, (c) When the rotor rotating plate rotates, the excitation coil or the detection coil arranged on the rotor rotating plate has an inclined surface or an arc surface on the surface that collides with the oil.
(2) In the resolver described in (1), a copper foil-resin joint portion of the print pattern of the excitation coil or the detection coil or the entire copper foil is covered with a coating.

(3) A rotor rotating plate that rotates together with the rotor shaft, a stator plate fixed to the stator, a pair of rotary transformers arranged to face the rotor rotating plate and the stator plate, and the rotor rotating plate And a stator coil, respectively, and a resolver for detecting the rotation angle of the rotor shaft, wherein (a) the rotor rotation plate and the stator plate are orthogonal to the rotor shaft The excitation coil and the detection coil are arranged opposite to each other on the opposite surface, and (b) the excitation coil and the detection coil are formed by a printed pattern in which the copper foil is bonded onto the resin. (C) The copper foil is accommodated in the recess formed in the resin.

(4) A rotor rotating plate that rotates together with the rotor shaft, a stator plate fixed to the stator, a pair of rotary transformers arranged to face the rotor rotating plate and the stator plate, and the rotor rotating plate And a stator coil, respectively, and a resolver for detecting the rotation angle of the rotor shaft, wherein (a) the rotor rotation plate and the stator plate are orthogonal to the rotor shaft The excitation coil and the detection coil are arranged opposite to each other on the opposite surface, and (b) the excitation coil and the detection coil are formed by a printed pattern in which the copper foil is bonded onto the resin. (C) The resin mold which covers a printed pattern is formed.

(5) A rotor rotating plate that rotates together with the rotor shaft of the automobile drive motor, a stator plate fixed to the stator, and a pair of rotary transformers arranged to face the rotor rotating plate and the stator plate, respectively. A resolver for an automobile drive motor having an excitation coil and a detection coil respectively disposed on the rotor rotating plate and the stator plate and detecting a rotation angle of the rotor shaft in an oil environment, (a) The rotor rotating plate and the stator plate are opposed to each other perpendicular to the rotor axis, and the exciting coil and the detecting coil are arranged to face each other on the opposed surface, and (b) the exciting coil and the detecting coil are printed. (C) the print pattern is in a direction in which the resistance of oil is reduced when the motor for driving the vehicle is rotating in the direction of moving the vehicle forward. It is location.

A resolver that is used by being directly attached to a rotor shaft of a drive motor of a hybrid vehicle or an electric vehicle is used while oil is dripped, so that high oil resistance is required.
First, the oil resistance required for the resolver is that the print pattern is not peeled off due to the force action of the oil. This is because the resolver used in the motor of the hybrid vehicle receives a strong force from the oil because it is used while the oil is dripping at a high peripheral speed exceeding about 80 m / sec. In particular, since oil is highly viscous, a strong force is applied.
Secondly, the printed pattern has a copper foil, which is a conductor pattern, bonded to the PCB (glass epoxy) with a blackened surface and bonded by an anchor effect. Due to the chemical action of sulfur and oxides of oil additives that reach a high temperature close to 150 degrees, the bonding strength may be reduced, and the printed pattern may be peeled off or the copper foil may be eroded.

In the resolver described in (1) above, (a) the rotor rotating plate and the stator plate are opposed to each other perpendicular to the rotor axis, and the exciting coil and the detecting coil are arranged to face each other on the opposed surfaces. (B) the excitation coil and the detection coil are formed by a printed pattern; (c) when the rotor rotation plate rotates, the excitation coil or detection coil arranged on the rotor rotation plate Since the collision surface is provided with an inclined surface or an arc surface, when the rotor rotates at high speed, the copper foil of both coils receives when oil collides with the copper foil of the excitation coil and the detection coil. As a force, a force pressing the copper foil against the resin acts in the direction opposite to the direction in which the copper foil of the coil is peeled off from the resin, so that the copper foil can be prevented from being peeled off.
In the resolver described in (2) above, since the end portions of the excitation coil and the detection coil are covered with a coating, the copper foil-resin bonding portion of the print pattern of the excitation coil or the detection coil is a coating material. Therefore, the oil does not enter the joint, and the joint strength of the joint is not weakened by the chemical action of sulfur or oxide of the oil additive.

In the resolver described in (3) above, (a) the rotor rotating plate and the stator plate are opposed to each other perpendicular to the rotor axis, and the exciting coil and the detecting coil are arranged to face each other on the opposed surfaces. (B) The excitation coil and the detection coil are formed by a printed pattern in which the copper foil is bonded onto the resin, and (c) the copper foil is accommodated in the recess formed in the resin, Since the coil and the detection coil do not directly collide with oil, the copper foil of the excitation coil and the detection coil is not peeled off from the resin.

In the resolver described in (4) above, (a) the rotor rotating plate and the stator plate face each other perpendicular to the rotor shaft, and the exciting coil and the detection coil are arranged to face each other on the facing surfaces. (B) The excitation coil and the detection coil are formed by a print pattern in which the copper foil is bonded onto the resin, and (c) the resin mold that covers the print pattern is formed. However, since the oil does not directly collide with the oil, the copper foil of the excitation coil and the detection coil is not peeled off from the resin.

In the resolver described in (5) above, (a) the rotor rotating plate and the stator plate are opposed to each other perpendicular to the rotor axis, and the exciting coil and the detecting coil are arranged to face each other on the opposed surfaces. (B) The excitation coil and the detection coil are formed by a print pattern, and (c) the resistance of oil is small when the print pattern rotates in the direction in which the motor for driving the vehicle advances the vehicle. Since the force applied to the print pattern can be reduced when the automobile is moving forward, the copper foil of the excitation coil and the detection coil is not peeled off from the resin. That is, the dropped oil receives the rotational force and centrifugal force due to the rotation of the rotor rotating plate, and is blown off along the rotor rotating plate and collides with the print pattern. Since the oil flows along the print pattern because it is arranged in a direction along the resultant force of the direction force and the centrifugal force, the force that the print pattern receives from the oil can be reduced.
With such an arrangement, when the automobile moves backward, the force applied to the print pattern increases.
However, in the case of an automobile, low-speed driving is generally used when traveling backward, and the frequency of use is extremely low compared to forward traveling.
Therefore, when the print pattern is used for a long period of time, it is better to reduce the force received during forward movement and increase the force received during backward movement than to receive the same force from oil when moving forward and backward. Since the pattern is less damaged, the copper foil of the excitation coil and the detection coil is not peeled off from the resin.

First, the overall configuration of the motor and generator of a hybrid vehicle in which the resolver of the present invention is used will be described. A central sectional view of the motor and generator is shown in FIG.
An engine shaft 53 of the engine 50 is connected to the motor shaft 11 via a transmission 54. The engine shaft 53 is rotatably held by a bearing 63 of the housing 62 and a bearing 59 of the housing 66. The motor shaft 11 is rotatably held by a bearing 14 of the housing 13 and a bearing 58 of the housing 55. The motor shaft 11 passes through the center of the motor body 56. The engine shaft 53 passes through the center of the generator body 51.
Resolvers 64 and 65 for detecting the rotation angle of the motor shaft 11 are attached to the motor shaft 11. Resolvers 60 and 61 for detecting the rotation angle of the engine shaft 53 are attached to the engine shaft 53.
A space surrounded by the housing 13, the housing 55, and the motor main body 56 is a sealed space in which oil is enclosed. The oil is for cooling the heat generated in the winding coil of the motor.
A resolver used in a hybrid vehicle is incorporated in a motor and directly attached to a rotor shaft of the motor. The motor is filled with oil for cooling the motor, and the oil is lifted and dropped by the rotor rotating plate and the transmission, so that the resolver is used by being exposed to the oil.

The resolvers 64 and 65 of the present invention will be described in detail below. Since the resolvers 60 and 61 have the same structure as the resolvers 64 and 65, description thereof is omitted.
The structure of the resolver according to the first embodiment of the present invention is shown in a central sectional view in FIG. One end of a motor shaft 11 that is a rotor shaft of a drive motor for a hybrid vehicle is rotatably held in a housing 13 by a sealed bearing 14. A stator printed circuit board 23 is attached to the housing 13 via a stator plate 24 that is a positioning bracket. The stator plate 24 is for positioning the stator printed circuit board 23 with respect to the housing 13. On the surface of the stator printed circuit board 23, one of the rotary transformers 22 is formed in an annular shape on the surface close to the motor shaft 11. An exciting coil pattern 20 is formed on the surface far from the motor shaft 11.

The motor shaft 11 protrudes from the motor body 12. Between the bearing 14 and the motor body 56 of the motor shaft 11, the rotor rotating plate 15 is held perpendicular to the motor shaft 11 by a pair of rings 16 and 17. That is, the rotor rotating plate 15 and the motor shaft 11 are positioned in the rotation direction by a key and a key groove (not shown). The key connection between the rotor rotating plate 15 and the motor shaft 11 has a slight backlash in the circumferential direction. Thereby, the rotor rotating plate 15 is maintained in the vertical degree by contacting the pair of rings 16 and 17.
A rotor printed circuit board 18 is disposed on the surface of the rotor rotating plate 15 that faces the stator printed circuit board 23 and on the opposed position. The rotor printed circuit board 18 is positioned and attached to the rotor rotating plate 15. On the surface of the rotor printed circuit board 18, the other pattern 21 of the rotary transformer is formed in an annular shape at a position facing the one 22 of the rotary transformer on the surface close to the motor shaft 11. A detection coil pattern 19 is formed at a position facing the excitation coil pattern 20 on the surface far from the motor shaft 11.

A front view of the rotor rotating plate 15 is shown in FIG. Further, FIG. 9 shows a cross-sectional view along AA of FIG. 8, and FIG. 10 shows a cross-sectional view along BB. FIG. 11 is an enlarged view of a portion C in FIG. FIG. 12 is an enlarged view of a portion D in FIG. FIG. 13 is an enlarged view of the EE cross section of FIG.
As shown in FIG. 8, the print pattern 19 g outward from the center of the detection coil pattern 19 is formed to be inclined in the direction opposite to the rotation direction of the rotor rotating plate 15 when the automobile moves forward indicated by an arrow in the figure.
Since the print pattern is tilted in such a direction that the oil resistance decreases when the motor for driving the vehicle is rotated in the direction of moving the vehicle forward, the print pattern is displayed when the vehicle is moving forward. Since this force can be reduced, the copper foil of the excitation coil and the detection coil is not peeled off from the resin.
That is, the dropped oil receives the rotational force and centrifugal force due to the rotation of the rotor rotating plate, and is blown off along the rotor rotating plate and collides with the print pattern. Since the oil flows along the print pattern because it is tilted in the direction along the resultant force of the direction and centrifugal force (the direction indicated by the oil flow arrow in FIG. 8), the print pattern is oil. The force received from the can be reduced.
A pair of contact points 19 a and 19 b are formed at both ends of the detection coil pattern 20.
The other pattern 21 of the rotary transformer is formed in a spiral shape. A contact 21 a is formed at the inner peripheral end of the other pattern 21, and a contact 21 b is formed at the outer peripheral end. The contact point 19 a and the contact point 21 a are connected on the back surface of the rotor rotating plate 15. Further, the contact point 19 b and the contact point 21 b are connected on the back surface of the rotor rotating plate 15. Thereby, the detection coil pattern 19 and the other pattern 21 of the rotary transformer form a closed loop.

As shown in part D of FIG. 10 and FIG. 12, ends 19c and 19d in the wiring direction of the detection coil pattern 19 which is a copper foil are formed in an arc shape. Due to the high speed rotation of the rotor rotating plate 15, the oil receives centrifugal force and flows along the surface of the rotor rotating plate 15 in the direction indicated by an arrow (oil flow) in FIG. 12. At this time, since the end 19c of the detection coil pattern 19 with which the oil collides has an arc shape, the oil that has collided presses the detection coil pattern 19 against the rotor printed circuit board 18 made of resin. Peeling from the printed board 18 can be prevented. This arc shape is processed by shot blasting, for example. For this reason, an arc shape is also formed at the opposite end 19d, but this may not be necessary. In the present embodiment, the arc shape has been described, but the same is true even if an inclined surface is formed.
Further, since the coating 70 is formed of a resin such as polyimide, the oil does not enter between the rotor printed board 18 and the detection coil pattern 19, so that the detection coil is caused by the chemical action of sulfur or oxide of the oil additive. The bonding force of the pattern 19 is not impaired.

An FF enlarged sectional view of FIG. 8 is shown in FIG. The detection coil patterns 19 shown in the FF cross-sectional view are arranged in the radial direction.
In the drawing, the oil flow indicates the relative oil flow direction generated in the detection coil pattern 19 due to the rotation of the rotor rotating plate 15 when the automobile moves forward. At this time, since the end 19e of the detection coil pattern 19 with which the oil collides has an arc shape, the oil that has collided presses the detection coil pattern 19 against the rotor printed circuit board 18 made of resin. Peeling from the substrate 18 can be prevented.
Further, when the automobile moves backward, the flow of oil is reversed, but the end 19f of the detection coil pattern 19 is also arc-shaped, so that the oil that has collided causes the detection coil pattern 19 to be a resin on the rotor printed board. Therefore, the detection coil pattern can be prevented from being peeled from the rotor printed board 18.
Further, since the coating 70 is formed of a resin such as polyimide, the oil does not enter between the rotor printed board 18 and the detection coil pattern 19, so that the detection coil is caused by the chemical action of sulfur or oxide of the oil additive. The bonding force of the pattern 19 is not impaired.

The EE sectional view of FIG. 8 appears the same as FIG. The reference numerals in FIG. 13 will be used as they are. Ends 19e and 19f in the direction orthogonal to the wiring direction of the detection coil pattern 19 which is a copper foil arranged along the circumference, that is, both sides of the copper foil are formed in an arc shape. The oil flows in the direction indicated by the arrow (oil flow) in FIG. 13 due to centrifugal force due to the high speed rotation of the rotor rotating plate 15. At this time, since the end 19e of the detection coil pattern 19 with which the oil collides has an arc shape, the oil that has collided presses the detection coil pattern 19 against the rotor printed circuit board 18 made of resin. Peeling from the substrate 18 can be prevented. This arc shape is processed by shot blasting, for example. For this reason, an arc shape is also formed at the opposite end 19f, but this may not be necessary.
Further, since the coating 70 is formed of a resin such as polyimide, the oil does not enter between the rotor printed board 18 and the detection coil pattern 19, so that the detection coil is caused by the chemical action of sulfur or oxide of the oil additive. The bonding force of the pattern 19 is not impaired.

FIG. 15 shows a front view of the stator plate 24. One pattern 22 of the rotary transformer is arranged at a position facing the other pattern 21 of the rotary transformer. Further, the exciting coil pattern 20 composed of the coil patterns 46 and 47 shifted in phase by 90 degrees is arranged at a position facing the detection coil pattern.
The patterns arranged in the radial direction of the exciting coil pattern 20 facing each other are inclined so as to face the same direction as the detection coil pattern 19 when facing the rotor rotating plate 15. This is because the excitation coil pattern 20 and the detection coil pattern 19 face each other and have the same shape. Although not shown, the pair of ends of the exciting coil pattern and the pair of ends of the one pattern 22 of the rotary transformer are connected to external terminals, respectively.
The excitation coil pattern 20 also has the structure shown in FIGS. 9 to 13 described with reference to the detection coil pattern 19. Since the stator plate 24 does not rotate, the influence of the excitation coil pattern from the oil is milder than that of the detection coil pattern 19.
In addition, since the action of oil due to the centrifugal force received by one pattern 22 of the rotary transformer is the same as the force received by the other pattern 21 of the rotary transformer, it is preferable to provide an inclined surface or an arc shape in the same manner.

Next, FIG. 3 shows a control block diagram showing a resolver control method. FIG. 4 shows the positional configuration of the control block. Since the control method of the resolver is basically the same as the control method disclosed in Patent Document 1, detailed description will be omitted and an overview description will be given.
The exciting coil pattern 20 is composed of a pair of coil patterns 46 and 47 whose phases are shifted by 90 degrees.
The excitation voltage supplied to the coil pattern 46 will be described. A 7.2 KHz sine wave (indicated by A in the figure) is supplied to the modulator 45. At the same time, a high-frequency sine wave of 720 KHz (indicated by B in the figure) is supplied to the modulator 45. In the modulator 45, the high-frequency sine wave of 720 KHz is amplitude-modulated by the sine wave of 7.2 KHz. At this time, the polarity of the 720 kHz high frequency is inverted at the polarity inversion position of the 7.2 kHz sine wave. As a result, the modulated wave is given a polarity, and when demodulated, a demodulated wave having the same polarity as the original 7.2 kHz sine wave is obtained (indicated by D in the figure).
Next, the excitation voltage supplied to the coil pattern 47 will be described. A 7.2 KHz cosine wave (indicated by C in the figure) is supplied to the modulator 40. At the same time, a high-frequency sine wave of 720 KHz (indicated by B in the figure) is supplied to the modulator 40. In the modulator 40, a high-frequency sine wave of 720 KHz is amplitude-modulated by a cosine wave of 7.2 KHz. At this time, a polarity demodulated wave having the same polarity as that of the original 7.2 KHz cosine wave is obtained by performing polarity inversion in the same manner as the modulation by the 7.2 KHz sine wave described above (indicated by E in the figure).

  An induced voltage induced by the excitation voltage is generated in the detection coil pattern 19. The induced voltage generated in the detection coil pattern 19 is demodulated by the demodulator 48 on the control board on the stator side via the pair of rotary transformer patterns 21 and 22 and input to the phase difference detector 44. By detecting the phase difference of the induced voltage induced in the detection coil pattern 19 by the excitation voltage applied to the excitation coil pattern 20, the rotation angle of the rotor rotating plate 15 with respect to the stator plate 24 can be measured. The phase difference detection has an advantage that the circuit configuration is simple.

FIG. 5 and FIG. 6 show changes in the accuracy of the measurement angle when rotational shake occurs in the motor shaft 11. FIG. 6 shows data of a conventional VR resolver, and FIG. 5 shows data of the resolver of the present invention. In either case, data is shown when the motor shaft is displaced by about 0.1 to 0.2 mm.
The vertical axis indicates the fluctuation value, that is, the error, and the horizontal axis indicates the rotation angle.
As shown in FIG. 6, in the conventional VR type resolver, an error occurs with a width of about 3 degrees in the range. In the resolver of the present invention, an error occurs within a range of about 1 degree or less in the range. Compared with the error range of the conventional VR resolver being about 3 degrees, the error range of the resolver of the present invention is 1 degree or less and the error is 1/3 or less.
The reason why the error is reduced is that the excitation coil pattern 20 composed of the print pattern and the detection coil pattern 19 composed of the print pattern are arranged at a certain width on the opposing planes at the opposing positions. Therefore, even if a slight deviation in the radial direction occurs in the motor shaft 11, the ratio between the deviation amount and the pattern width does not change greatly.

As described above in detail, according to the resolver of the present embodiment, (a) the rotor rotating plate 15 and the stator plate face each other perpendicular to the rotor shaft, and the exciting coil and the The detection coils are arranged to face each other, (b) the excitation coil and the detection coil are formed by a print pattern, and (c) when the rotor rotation plate rotates, it is arranged on the rotor rotation plate. Since the excitation coil or detection coil has an inclined surface or arc surface on the surface that collides with oil, when oil collides with the copper foil of the excitation coil or detection coil when the rotor rotates at high speed In addition, as the force received by the copper foil of both coils, the force that presses the copper foil against the resin acts in the direction opposite to the direction in which the copper foil of the coil is peeled off from the resin, thus preventing the copper foil from being peeled off. It is possible.
In addition, since the end of the excitation coil pattern 20 or the detection coil pattern 19 (or the entire copper foil forming the excitation coil pattern 20 or the detection coil pattern) is covered with the coating 70, the excitation coil pattern 20 or the detection coil pattern Since the joint part of 19 copper foils and resin (or the whole copper foil) is covered with the coating 70, oil does not enter the joint part, and the chemical action of sulfur and oxide of the oil additive The bonding strength of the bonded portion is not weakened.

In addition, since the print patterns of the detection coil pattern 19 and the excitation coil pattern 20 are arranged in a direction in which the oil resistance decreases when the motor for driving the vehicle rotates in the direction of moving the vehicle forward, Since the force applied to the print pattern can be reduced when moving forward, the copper foil of the excitation coil pattern 20 and the detection coil pattern 19 is not peeled off from the resin. That is, the dropped oil receives the rotational force and centrifugal force due to the rotation of the rotor rotating plate, and is blown off along the rotor rotating plate and collides with the print pattern. Since the oil flows along the print pattern because it is tilted in the direction along the resultant force of the direction and centrifugal force (the direction indicated by the oil flow arrow in FIG. 8), the print pattern is oil. The force received from the can be reduced.
With such an arrangement, when the automobile moves backward, the force applied to the print pattern increases.
However, in the case of an automobile, low-speed driving is generally used when traveling backward, and the frequency of use is extremely low compared to forward traveling.
Therefore, when the print pattern is used for a long period of time, it is better to reduce the force received during forward movement and increase the force received during backward movement than to receive the same force from oil when moving forward and backward. Since the pattern is less damaged, the copper foil of the excitation coil pattern 20 and the detection coil pattern 19 is not peeled off from the resin.

  Next, a second embodiment will be described. In the second embodiment, as shown in FIG. 14, the arrangement of lines in the radial direction of the detection coil pattern 19 and the excitation coil pattern 20 is arranged along the radial direction, and the other points are the first implementation. The explanation is omitted because it is the same as the example.

Next, a third embodiment will be described. In the third embodiment, as shown in FIG. 16, a recess is formed in the rotor printed board 18 of the rotor rotating plate 15, and the detection coil pattern 19 is accommodated in the recess. Further, a recess is formed in the stator printed board 26 of the stator plate 24, and the exciting coil pattern 20 is accommodated in the recess.
According to this, since the copper foil of the detection coil pattern and the excitation coil pattern is accommodated in the recess formed in the resin of the printed circuit board, the excitation coil pattern 20 and the detection coil pattern 19 directly collide with oil. Therefore, the excitation foil and the copper foil of the detection coil are not peeled off from the resin.

Next, a fourth embodiment will be described. In the fourth embodiment, as shown in FIG. 17, the rotor rotating plate 15, the rotor printed board 18, the detection coil pattern 19, and the other pattern 21 of the rotary transformer are all covered with a resin mold 70. Further, the stator plate 24, the stator printed circuit board 23, the exciting coil pattern 20, and the one pattern 21 of the rotary transformer are all covered with a resin mold 70. The resin mold 71 is manufactured by insert molding using a metal mold or immersion.
In this embodiment, it is covered with the resin mold 71, but a polyimide film may be attached or polyimide may be applied.

Next, a fifth embodiment of the resolver of the present invention will be described. FIG. 2 shows a central sectional view of the resolver of the fifth embodiment. Since most parts of the entire configuration are the same as those of the resolver of the first embodiment, the same parts are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.
The structure of the rotary transformer is different. The stator-side rotary transformer pattern 26 is a printed pattern and is formed on the stator substrate 28. The stator substrate 28 is positioned on the housing 13 by a stator plate 29 which is a positioning bracket.
The rotor-side rotary transformer pattern 25 is a printed pattern and is formed on the rotor substrate 27. The rotor substrate 27 is positioned on a rotor transformer plate 32 disposed adjacent to the rotor rotating plate 15. The stator-side rotary transformer pattern 26 and the rotor-side rotary transformer pattern 25 are respectively disposed on the outer peripheral surface of the rotor transformer plate 32 and the inner peripheral surface of the stator plate 29 facing the outer peripheral surface of the rotor transformer plate 32. ing.

The rotary transformer patterns 21 and 22 of the first embodiment face each other in the same direction as the exciting coil pattern 20 and the detection coil pattern 19, but the rotary transformer patterns 25 and 26 of the second embodiment face each other. Is different from the motor shaft 11 in parallel.
The exciting coil pattern 20 is formed on the stator printed board 31. The stator printed circuit board 31 is positioned on the stator plate 29. The detection coil pattern 19 is formed on the rotor printed board 30. The rotor printed circuit board 30 is positioned on the rotor rotating plate 15.

According to the resolver of the fifth embodiment, the excitation coil pattern 20 and the detection coil pattern 19 are formed by the print pattern, and the pair of rotary transformer patterns 25 and 26 are formed by the print pattern. Therefore, since it is not necessary to wind, cost can be reduced.
Further, since the pair of rotary transformer patterns 25 and 26 are arranged on the outer peripheral surface of the rotor transformer plate 32 and the inner peripheral surface of the stator plate 29 facing the outer peripheral surface of the rotor transformer plate 32, the exciting coil pattern 20. And the width of the detection coil pattern 19 can be arranged on the entire surfaces of the rotor rotating plate 15 and the stator plate 29 facing each other, so that the rotation angle measurement accuracy can be kept high against the rotational deviation of the motor shaft 11. it can.

In addition, this invention is not limited to each said embodiment, In the range which does not deviate from the meaning of invention, it can also implement as follows.
For example, in this embodiment, the excitation coil pattern is arranged on the stator side and the detection coil pattern is arranged on the rotor side. However, the detection coil pattern may be arranged on the stator side and the excitation coil pattern may be arranged on the rotor side. .
In this embodiment, the rotary transformer is configured by a print pattern. However, the rotary transformer may be configured by a winding and may be pushed into a groove formed on a flat plate surface.

It is a center sectional view showing the composition of the resolver of the 1st example of the present invention. It is a center sectional view showing the composition of the resolver of the 5th example of the present invention. It is a control block diagram which shows the control structure of a resolver. It is a figure which shows the positional relationship of the control block of a resolver. It is an experimental data figure of the resolver of this invention. It is an experimental data figure of the conventional VR resolver. It is a center cross-sectional view which shows the structure of the motor for hybrid vehicles to which the resolver of this invention was attached. It is a front view of the rotor rotating plate 15 of the resolver of 1st Example of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is the C section enlarged view of FIG. It is the D section enlarged view of FIG. It is FF cross-sectional enlarged view of FIG. It is a front view of the rotor rotating plate 15 of 2nd Example. 3 is a front view of a stator plate 24. FIG. It is a center fragmentary sectional view which shows the structure of the resolver of 3rd Example. It is a center fragmentary sectional view which shows the structure of the resolver of 4th Example.

Explanation of symbols

11 Motor shaft 13 Housing 15 Rotor rotary plate 16, 17 Ring 19 Detection coil pattern 19a, 19b, 19c, 19d, 19e, 19f Arc shape 20 Excitation coil pattern 21, 22 Rotary transformer pattern 24 Stator plate 25, 26 Rotary transformer Pattern 56 Motor body

Claims (1)

A rotor rotating plate that rotates together with a rotor shaft of an automobile drive motor, a stator plate fixed to the stator, a pair of rotary transformers arranged to face the rotor rotating plate and the stator plate, and the rotor rotation A resolver for an automobile drive motor having an excitation coil and a detection coil respectively disposed on the plate and the stator plate, and detecting the rotation angle of the rotor shaft under an oil environment;
The rotor rotating plate and the stator plate are opposed to each other perpendicular to the rotor axis, and the exciting coil and the detection coil are arranged to face each other on the opposed surfaces;
The excitation coil and the detection coil are formed of a print pattern;
The print pattern comprises a pattern outward from the center, the pattern outward from the center, in the direction opposite to the rotation direction of the rotor rotation plate when said car driving very much over motor to advance the motor vehicle Only leaning,
A resolver for an automobile drive motor .

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