JP6914443B2 - Motor and valve timing adjuster - Google Patents

Description

The present invention relates to a motor and a valve timing adjusting device using the motor.

Conventionally, a brushless motor in which a circuit board is integrated as described in Patent Document 1 is known.

Japanese Unexamined Patent Publication No. 2016-220285

In the brushless motor described in Patent Document 1, the rotor support structure is a double-sided structure in which both ends of a rotary shaft to which the rotor is fixed are supported by a pair of bearings. Therefore, one bearing, the rotor, and the other bearing are arranged in this order along the axial direction of the rotating shaft, and the brushless motor becomes long in the axial direction. Further, since the bearings are present at both ends of the rotating shaft, the circuit board has to be arranged outside the bearing in the radial direction, and the brushless motor becomes large in the radial direction.

Since the conventional circuit board-integrated motor is configured as described above, there is a problem that the size of the rotating shaft in the axial direction and the radial direction is large.

The present invention has been made to solve the above problems, and an object of the present invention is to realize a circuit board-integrated motor in which the axial and radial sizes of the rotating shaft are small.

The motor according to the present invention has a rotary shaft, a field magnet, a magnetic material yoke, and a sensor magnet, and has a rotor that rotates integrally with the rotary shaft, a stator located on the outer peripheral side of the rotor, and a rotary shaft. A circuit board that has a bearing to support, a housing that holds the stator and bearings, a drive unit that drives the rotary shaft, and a position detection element that detects the position of the sensor magnet, and is located on one end side of the rotary shaft in the axial direction. The rotor has a recess on the inner peripheral side of the field magnet and the magnetic material yoke and on the side opposite to one end side on which the circuit board is arranged in the axial direction of the rotating shaft, and the bearing and the housing. The bearing holding portion, which is a portion for holding the bearing, is located in the recess. The field magnet, magnetic yoke, and sensor magnet of the rotor are integrated with a resin, and the sensor magnet is magnetized to an integral multiple of the number of poles of the field magnet.

According to the present invention, the rotor has a recess on the inner peripheral side of the field magnet and the magnetic material yoke and on the side opposite to one end side on which the circuit board is arranged in the axial direction of the rotating shaft, and has a bearing and a recess. Since the bearing holding portion of the housing is located in the recess, it is possible to realize a circuit board-integrated motor in which the size of the rotating shaft in the axial direction and the radial direction is small.

It is sectional drawing which shows the structural example of the motor which concerns on Embodiment 1. FIG. It is sectional drawing which shows the modification of the motor which concerns on Embodiment 1. FIG. FIG. 5 is a plan view showing components related to the magnetic structure of the rotor and the stator in the motor according to the first embodiment. FIG. 5 is a modified example of the motor according to the first embodiment, and is a plan view showing components related to the magnetic structure of the surface-arranged rotor. It is a modification of the motor which concerns on Embodiment 1, and is the top view which shows the component | component which concerns on the magnetic structure of the embedded arrangement type rotor. FIG. 5 is an exploded perspective view showing a configuration example of a circuit board and a holder in the motor according to the first embodiment. It is a top view which shows the installation example of the substrate terminal in the holder of Embodiment 1. FIG. It is sectional drawing which shows the structural example of the valve timing adjustment device and the motor which concerns on Embodiment 2. FIG. It is the schematic of the engine equipped with the valve timing adjustment device which concerns on Embodiment 2. FIG.

Hereinafter, in order to explain the present invention in more detail, a mode for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1.
FIG. 1A is a cross-sectional view showing a configuration example of the motor 10 according to the first embodiment. The motor 10 holds a rotary shaft 20, a rotor 30 that rotates integrally with the rotary shaft 20, a stator 40 located on the outer peripheral side of the rotor 30, a bearing 51 that supports the rotary shaft 20, a bearing 51, and a stator 40. A housing 50, a holder 60 for holding the circuit board 61, and a cover 70 for covering the circuit board 61 are included. Hereinafter, one end side of the rotary shaft 20 on the circuit board 61 side is referred to as a counter-output side, and the other end side of the rotary shaft 20 on the bearing 51 side is referred to as an output side.

The rotor 30 is fixed to the counter-output side of the rotating shaft 20. The rotation of the rotary shaft 20 and the rotor 30 is supported by the bearing 51. At least one bearing 51, preferably two or more bearings 51, is provided. The plurality of bearings 51 are arranged side by side in the axial direction of the rotating shaft 20. In the illustrated example, two single-row rolling bearings are arranged side by side in the axial direction on the output side of the rotary shaft 20. Further, a seal member 53 is provided on the output side of the rotary shaft 20 from the bearing 51.

The housing 50 is a tubular structure having a bottom portion. The stator 40 is fixed to the inner peripheral surface of the housing 50. A bearing holding portion 52 having a shape surrounding the output side of the rotating shaft 20 is formed on the bottom of the housing 50, and the bearing holding portion 52 holds the bearing 51. The holder 60 is fixed to the opening side of the housing 50.

The rotor 30 is a sensor that generates a magnetic flux for detection by a field magnet 31, a magnetic material yoke 32 that forms a magnetic path of the magnetic flux created by the field magnet 31, and a Hall IC (Integrated Circuit) 63 described later. It has a magnet 33. For example, a plurality of magnetic thin plates such as electromagnetic steel plates are laminated, and the thin plates are fixed to each other by caulking or welding to form a magnetic yoke 32. A non-magnetic protective member 37 is provided on the outer peripheral surface of the field magnet 31 in order to prevent the field magnet 31 from falling off and debris from scattering when the field magnet 31 is damaged. Further, the rotor 30 is fixed to the rotating shaft 20 via a metal bush 34.

The field magnet 31, the magnetic material yoke 32, the sensor magnet 33, and the bush 34 are integrated with the resin 35. The field magnet 31, magnetic material yoke 32, sensor magnet 33, and bush 34 and the resin 35 may be integrally molded by insert molding or the like, or the field magnet 31, magnetic material yoke 32, and sensor magnet may be integrally formed. After some parts of 33 or the bush 34 are integrally molded with the resin 35, the remaining parts may be fixed to the integrally molded product. In the configuration example of FIG. 1A, after the magnetic material yoke 32, the sensor magnet 33, the bush 34, and the resin 35 are integrally molded, the field magnet 31 is fixed to the outer peripheral surface of the magnetic material yoke 32 by an adhesive or the like. Will be done. The bush 34 of the rotor 30 formed in this way is press-fitted into the rotary shaft 20 to fix the rotor 30 to the rotary shaft 20. In order to obtain the rotor 30 that can withstand high torque, a detent such as a knurl may be formed on the inner peripheral surface of the bush 34.

The motor 10 shown in FIG. 1A has a configuration in which the rotary shaft 20 and the resin 35 of the rotor 30 are fixed via the bush 34, but the rotary shaft 20 and the rotor 30 do not use the bush 34. The structure may be such that the resin 35 is directly fixed to the resin 35. FIG. 1B is a cross-sectional view showing a modified example of the motor 10 according to the first embodiment. In the configuration shown in FIG. 1B, for example, the rotating shaft 20, the field magnet 31, the magnetic material yoke 32, the sensor magnet 33, and the resin 35 are integrally molded.

As shown in FIGS. 1A and 1B, the rotor 30 integrally formed of the resin 35 has a substantially cylindrical recess 36 on the inner peripheral side of the magnetic yoke 32 and on the output side of the rotating shaft 20. The bearing 51 and the bearing holding portion 52 are arranged in the cavity formed on the outer peripheral side of the rotating shaft 20 by the recess 36.

Next, a plurality of forms of the rotor 30 will be described with a description of the functions of the motor 10.

FIG. 2 is a plan view showing components related to the magnetic structure of the rotor 30 and the stator 40 in the motor 10 according to the first embodiment. FIG. 2 shows a state in which the rotor 30 and the stator 40 are viewed in the axial direction of the rotating shaft 20. The protective member 37 and the like are not shown. Further, in FIG. 2, the circuit board 61 and one or more hall ICs 63 mounted on the circuit board 61 are shown by an alternate long and short dash line. In the example of FIG. 2, the stator 40 has an 18-teeth configuration and the rotor 30 has a 12-pole configuration.

A predetermined gap is provided between the outer peripheral side of the rotor 30 and the inner peripheral side of the stator 40. The stator 40 includes a magnetic core 41 for passing magnetic flux, an armature coil 43 for passing an electric current for creating magnetic flux, and a bobbin 42 for electrically insulating the magnetic core 41 and the armature coil 43. Has. For example, a plurality of magnetic thin plates such as electromagnetic steel plates are laminated, and the thin plates are fixed to each other by caulking or welding to form a magnetic core 41. The bobbin 42 is an injection-molded product made of resin. The bobbin 42 may be integrally molded in a mold in which the magnetic core 41 is installed as an insert component. The armature coil 43 is a coil centrally wound around each bobbin 42 provided on each tooth of the magnetic core 41, and these coils form three phases of U phase, V phase, and W phase. Further, the start end and the end end of the armature coil 43 are electrically joined to the motor terminal 45 mounted on the connection plate 44. The joining method may be either solder or fusing.

The sensor magnet 33 of the rotor 30 has a cylindrical shape having a short axial length, and is, for example, a ferrite sintered magnet, a rare earth bond magnet, or a rare earth sintered magnet. The sensor magnet 33 is magnetized to the same number of poles as the number of poles of the field magnet 31 or an integral multiple of the number of poles. Further, the phase of the pole position between the sensor magnet 33 and the field magnet 31 can be adjusted by the control logic of the drive unit 64 provided on the circuit board 61, and thus may be arbitrary. In the example of FIG. 2, the pole position of the sensor magnet 33 and the pole position of the field magnet 31 are the same.

The field magnet 31 of the rotor 30 is formed of a group of magnets having an arcuate cross section as many as the number of poles, and each of the magnets having an arcuate cross section is located on the outer peripheral surface of the magnetic yoke 32 and between the protrusions 38. Be placed. As described above, each of the magnets having an arcuate cross section is fixed to the outer peripheral surface of the magnetic yoke 32 with an adhesive or the like. The rotor 30 of the form shown in FIG. 2 is a so-called surface arrangement type (SPM).

Here, the configuration of the field magnet 31 and the magnetic material yoke 32 will be described because there are configuration examples different from those in FIG. 2.
FIG. 3A is a modified example of the motor 10 according to the first embodiment, and is a plan view showing components related to the magnetic structure of the surface-arranged rotor 30. The protective member 37 is not shown. Similar to the rotor 30 shown in FIG. 2, the rotor 30 shown in FIG. 3A is a surface-arranged type in which a field magnet 31 is arranged on the outer peripheral surface of the magnetic yoke 32. However, in FIG. 2, the field magnet 31 is segmented, whereas in FIG. 3A, the field magnet 31 is one ring magnet.

The surface-mounted rotor 30 as shown in FIGS. 2 and 3A has the following advantages.
Since the field magnet 31 is located on the outermost circumference of the rotor 30, the surface area of the field magnet 31 is increased and the amount of magnetic flux generated is increased, so that high torque can be easily obtained.
Further, since the field magnet 31 directly faces the stator 40, the magnetic flux easily interlinks with the stator 40, and a high torque can be easily obtained.

FIG. 3B is a modified example of the motor 10 according to the first embodiment, and is a plan view showing components related to the magnetic structure of the embedded rotor 30. In the rotor 30 shown in FIG. 3B, a plurality of holes 39 are formed in the magnetic yoke 32. A flat plate-shaped field magnet 31 is embedded in each hole 39. The rotor 30 of the form shown in FIG. 3B is a so-called embedded magnet (IPM).

In the example of FIG. 3B, two field magnets 31 are arranged in a V shape for each magnetic pole, but the number of field magnets 31 may be the same as the number of magnetic poles or an integral multiple thereof. Further, in the example of FIG. 3B, the shape of the field magnet 31 is a flat plate, but it may be a shape such as an arc-shaped cross section or a semi-cylindrical shape. Further, in the example of FIG. 3B, a flux barrier 39a is formed at both ends of the hole 39 in order to prevent a short circuit of the magnetic flux in the rotor 30. The flux barrier 39a is a hole for increasing the magnetic resistance. Although not shown, it may be a simple hole 39 without a flux barrier 39a.

The embedded rotor 30 as shown in FIG. 3B has the following advantages.
In the case of the surface arrangement type, in the application of rotating the rotor 30 at high speed, it is necessary to provide the protective member 37 as shown in FIG. 1 on the outer peripheral side of the field magnet 31, but in the case of the embedded arrangement type, protection is provided. Since the member 37 is unnecessary, the number of parts can be reduced.
Focusing on the magnetic resistance of the magnetic yoke 32, the magnetic resistance fluctuates depending on the rotation position of the rotor 30 depending on the presence or absence of the holes 39. Then, when the drive unit 64 of the circuit board 61 passes a current through the armature coil 43 of the stator 40 in an appropriate phase, not only the magnet torque generated by the action with the field magnet 31 but also the fluctuation of the magnetoresistance. That is, a reluctance torque using the salient pole is also generated, and it is easy to obtain a high torque.

As described above, the field magnet 31 and the magnetic material yoke 32 constituting the rotor 30 have a plurality of forms, and the appropriate forms can be selected according to the operating environment of the motor 10 and the load of the object to be operated by the motor 10. Just do it.

Next, the circuit board 61 and the holder 60 that holds the circuit board 61 will be described.
FIG. 4 is an exploded perspective view showing a configuration example of the circuit board 61 and the holder 60 in the motor 10 according to the first embodiment. FIG. 5 is a plan view showing an installation example of the substrate terminal 62 in the holder 60 of the first embodiment.

The circuit board 61 has a hall IC 63 and a drive unit 64. Further, a motor terminal 45 is electrically joined to the circuit board 61. Specifically, the motor terminal 45 penetrates through a through hole provided on the circuit board 61, and the penetrating portion is joined by solder or the like.

The Hall IC 63 is a position detecting element that detects the rotational position of the rotor 30 by detecting the magnetic flux of the sensor magnet 33 of the rotor 30. The positional relationship between the sensor magnet 33 of the rotor 30 and the hall IC 63 mounted on the circuit board 61 is shown in FIG. The drive unit 64 has a switching element or the like that switches the energization of the U-phase, V-phase, and W-phase of the armature coil 43 through the motor terminal 45.

The circuit board 61 is installed and fixed in a holder 60 made of resin. The fixing method may be fastening with screws 66, welding or the like. Further, the circuit board 61 needs to join a power supply, communication, ground, etc. to a motor control device (not shown) outside the motor 10, and these roles are played by the connector portion 65 provided in the holder 60 and the connector portion 65. A plurality of board terminals 62 are responsible. That is, as shown in FIG. 5, one end of each substrate terminal 62 is joined through a through hole provided on the circuit board 61 with solder or the like, and the other end is exposed to the connector portion 65. It is desirable that these substrate terminals 62 are insert-molded into the holder 60. By insert molding, the number of parts when assembling the motor 10 can be reduced, and the circuit board 61 and the board terminal 62 can be easily joined.

Further, the holder 60 may be equipped with a large component that is difficult to mount on the circuit board 61. In the example of FIG. 4, the capacitor 68 and the coil 69 constituting the noise filter are mounted on the holder 60 instead of the circuit board 61. The capacitor 68 and the coil 69 are electrically joined to the circuit board 61 by the board terminal 62.

As described above, the motor 10 according to the first embodiment supports the rotary shaft 20, the rotor 30 that rotates integrally with the rotary shaft 20, the stator 40 located on the outer peripheral side of the rotor 30, and the rotary shaft 20. It includes a bearing 51, a housing 50 that holds the stator 40 and the bearing 51, and a circuit board 61 located on one end side of the rotary shaft 20 in the axial direction. The rotor 30 has a recess 36 on the inner peripheral side of the field magnet 31 and the magnetic material yoke 32, and on the side opposite to one end side on which the circuit board 61 is arranged in the axial direction of the rotating shaft 20. The bearing 51 and the bearing holding portion 52 that holds the bearing 51 of the housing 50 are located in the recess 36. By cantilevering the rotating shaft 20 and arranging the bearing 51 in the recess 36, it is possible to realize a motor 10 in which the circuit board 61 is integrated with the rotating shaft 20 having a small axial and radial size.

Further, since the rotating shaft 20 is cantilevered, the degree of freedom in the size and layout of the circuit board 61 arranged on the opposite output side of the rotating shaft 20 can be increased. For example, when the circuit board 61 is arranged directly above the rotating shaft 20 in the axial direction, the hole IC 63 can be arranged near the rotating shaft 20, so that the diameter of the sensor magnet 33 can be reduced. As a result, the rotor 30 can be made smaller and lighter.

On the other hand, in the brushless motor described in Patent Document 1, bearings are arranged at both ends of the rotating shaft, so that the Hall IC must be arranged at a position away from the rotating shaft. In that case, the diameter of the sensor magnet becomes large, the rotor becomes large, and the cost becomes high. Alternatively, it is also possible to detect the rotational position of the rotor by causing the Hall IC to detect the magnetic flux of the field magnet of the rotor instead of detecting the magnetic flux of the sensor magnet. In that case, it is necessary to extend the field magnet toward the Hall IC on the circuit board or to arrange the Hall IC in the gap between the rotor and the stator instead of on the circuit board. In the former case, the field magnet and the rotor become large and costly, and in the latter case, the structure for arranging the Hall IC becomes complicated.

Further, according to the first embodiment, the field magnet 31, the magnetic material yoke 32, and the sensor magnet 33 of the rotor 30 are integrated with the resin 35. As a result, the weight of the rotor 30 can be reduced, and the number of parts when assembling the motor 10 can be reduced.

Further, the motor 10 according to the first embodiment includes a metal bush 34 fixed to the rotating shaft 20. The field magnet 31, the magnetic material yoke 32, the sensor magnet 33, and the bush 34 of the rotor 30 are integrated with the resin 35. As a result, when the rotor 30 is press-fitted into the rotary shaft 20, the resin 35 of the rotor 30 can be assembled without cracking. Further, by providing a detent such as a knurl on the inner peripheral surface of the bush 34, a rotor 30 capable of withstanding high torque can be obtained.

As shown in FIG. 1B, the rotary shaft 20 and the rotor 30 may be integrated with the resin 35. In this configuration, since the metal bush 34 is not required, the weight of the motor 10 can be reduced and the number of parts can be reduced.

Further, the bearing 51 of the first embodiment is at least two rolling bearings. As a result, the vibration resistance of the rotating shaft 20 and the rotor 30 is improved.

Further, the motor 10 according to the first embodiment includes a holder 60 fixed to the counter-output side of the rotating shaft 20 in the housing 50. Further, the circuit board 61 is fixed to the holder 60, and the hall IC 63 is arranged on the surface of the circuit board 61 facing the sensor magnet 33. In this configuration, the holder 60 functions to hold the circuit board 61 and to determine the position of the hall IC 63 with respect to the sensor magnet 33 of the rotating rotor 30.

Further, the holder 60 of the first embodiment is formed of resin and has a substrate terminal 62 that is electrically bonded to the circuit board 61 inside the resin. Since the board terminal 62 is integrally formed with the holder 60, the number of parts when assembling the motor 10 can be reduced, and the circuit board 61 and the board terminal 62 can be easily joined.

Further, the holder 60 of the first embodiment has a connector portion 65 formed of resin. As a result, when the holder 60 and the substrate terminal 62 are insert-molded, the connector portion 65 can be molded at the same time.

Further, the field magnet 31 of the first embodiment is attached to the magnetic material yoke 32. High torque can be obtained by making the rotor 30 a surface-arranged type.

The field magnet 31 of the first embodiment may be arranged in the hole 39 formed in the magnetic yoke 32. By adopting the rotor 30 as an embedded arrangement type, the protective member 37 becomes unnecessary, and the number of parts can be reduced. Moreover, high torque can be obtained.

Embodiment 2.
In the second embodiment, a valve timing adjusting device including the motor 10 according to the first embodiment will be illustrated. The valve timing adjusting device adjusts the opening / closing timing of the intake valve and the exhaust valve of the engine.

FIG. 6 is a cross-sectional view showing a configuration example of the valve timing adjusting device 1 and the motor 10 according to the second embodiment. FIG. 7 is a schematic view of an engine equipped with the valve timing adjusting device 1 according to the second embodiment. In FIGS. 6 and 7, the same or corresponding parts as those in FIGS. 1A to 5 are designated by the same reference numerals, and the description thereof will be omitted.

The valve timing adjusting device 1 includes an input shaft 100, a first rotating body 110, a second rotating body 120, and a planetary gear 130. The input shaft 100 has a fitting portion 101 into which the rotating shaft 20 of the motor 10 is fitted, and rotates by receiving the torque of the motor 10. The first rotating body 110 is formed by integrating the case 111, the internal tooth gear 112, and the cover 113. The second rotating body 120 has an output gear 121 and is fastened to the camshaft 3 by a center bolt 2. The second rotating body 120 is supported by a slide bearing portion 114 formed on the inner peripheral surface of the case 111, and rotates relative to the first rotating body 110. The planetary gear 130 meshes with the internal tooth gear 112 and the output gear 121. The bearing 102 rotatably supports the input shaft 100 and the first rotating body 110. The bearing 103 rotatably supports the input shaft 100 and the second rotating body 120. The bearing 104 rotatably supports the input shaft 100 and the planetary gear 130.

The internal tooth gear 112, the output gear 121, and the planetary gear 130 are reduction gears that function as a mysterious planetary gear mechanism. The speed reducer used in the valve timing adjusting device 1 is not limited to the mysterious planetary gear mechanism shown in FIG. 6, and may be a hypocycloid speed reducer or the like.

When the input shaft 100 rotates clockwise with the rotation of the rotating shaft 20, the planetary gear 130 rotates with respect to the eccentric shaft eccentric from the rotating shaft of the rotating shaft 20, while rotating the rotating shaft of the rotating shaft 20. Performs a planetary motion that revolves counterclockwise around. On the other hand, since the output gear 121 is rotatably supported with respect to the first rotating body 110, it rotates clockwise by receiving the reaction force of the revolving motion of the planetary gear 130. The output gear 121 amplifies and outputs the torque input to the input shaft 100 by rotating clockwise by an angle corresponding to the difference in the number of teeth between the output gear 121 and the internal tooth gear 112.

As shown in FIG. 7, the annular chain 5 is wound around the outer peripheral surface of the first rotating body 110 of the valve timing adjusting device 1 and the outer peripheral surface of the crankshaft 4. The rotational movement of the crankshaft 4 is transmitted to the first rotating body 110 of the valve timing adjusting device 1 via the chain 5 to rotate the first rotating body 110. The second rotating body 120 rotates while maintaining a relative rotation position with respect to the first rotating body 110. The camshaft 3 rotates integrally with the second rotating body 120.

The motor 10 rotates the input shaft 100 fitted to the rotary shaft 20 by being rotationally controlled by a motor control device (not shown). The relative rotation positions of the first rotating body 110 and the second rotating body 120 are adjusted according to the rotation of the input shaft 100 by the motor 10.

When the valve timing adjusting device 1 is advanced, the motor 10 rotates the input shaft 100 at a rotation speed higher than the rotation speed of the first rotating body 110. At this time, according to the operating principle of the mysterious planetary gear mechanism, the second rotating body 120 rotates and moves in the advancing direction relative to the first rotating body 110.

When the valve timing adjusting device 1 is made to perform a retarded operation, the motor 10 sets the input shaft 100 at a rotation speed smaller than the rotation speed of the first rotating body 110 or in a direction opposite to the rotation direction of the first rotating body 110. Rotate. At this time, according to the operating principle of the mysterious planetary gear mechanism, the second rotating body 120 rotates and moves in the retard direction relative to the first rotating body 110.

When the motor 10 rotates the input shaft 100 at the same rotation speed as the first rotating body 110, the relative rotation position between the second rotating body 120 and the first rotating body 110 is maintained.

As described above, the valve timing adjusting device 1 according to the second embodiment has a configuration in which the motor 10 according to the first embodiment is used for driving. By using the small motor 10, the valve timing adjusting device 1 can also be miniaturized. As the valve timing adjusting device 1 becomes smaller, the layout around the engine is improved.

Further, the valve timing adjusting device 1 according to the second embodiment includes a speed reducer including an internal tooth gear 112, an output gear 121, and a planetary gear 130 connected to the rotating shaft 20 of the motor 10. Since the speed reducer amplifies the torque of the motor 10, a motor 10 that outputs a low torque, that is, a small motor 10 can be used.

It should be noted that, within the scope of the present invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component of each embodiment.

Since the motor according to the present invention can be miniaturized and lightened, it is suitable for use in a valve timing adjusting device or the like mounted on a vehicle.

1 Valve timing adjuster, 2 Center bolt, 3 Cam shaft, 4 Crank shaft, 5 Chain, 10 Motor, 20 Rotating shaft, 30 Rotor, 31 Field magnet, 32 Magnetic yoke, 33 Sensor magnet, 34 Bush, 35 Resin, 36 recesses, 37 protective members, 38 protrusions, 39 holes, 39a flux barrier, 40 stators, 41 magnetic cores, 42 bobbins, 43 armature coils, 44 connection plates, 45 motor terminals, 50 housings, 51 bearings, 52 Bearing holder, 53 Seal member, 60 holder, 61 Circuit board, 62 Board terminal, 63 hole IC (position detection element), 64 Drive part, 65 Connector part, 66 screw, 68 condenser, 69 coil, 70 cover, 100 Input shaft, 101 mating part, 102, 103, 104 bearing, 110 first rotating body, 111 case, 112 internal tooth gear (reducer), 113 cover, 114 sliding bearing part, 120 second rotating body, 121 output gear (Reducer), 130 planetary gear (reducer).

Claims (11)

Rotating shaft and
A rotor having a field magnet, a magnetic material yoke, and a sensor magnet and rotating integrally with the rotating shaft.
A stator located on the outer peripheral side of the rotor and
Bearings that support the rotating shaft and
A housing that holds the stator and bearings,
It has a drive unit for driving the rotary shaft and a position detection element for detecting the position of the sensor magnet, and includes a circuit board located on one end side in the axial direction of the rotary shaft.
The rotor has a recess on the inner peripheral side of the field magnet and the magnetic material yoke, and on the side opposite to one end side on which the circuit board is arranged in the axial direction of the rotating shaft.
The bearing and the bearing holding portion, which is a portion of the housing that holds the bearing, are located in the recess.
The field magnet, the magnetic material yoke, and the sensor magnet included in the rotor are integrated with a resin.
The sensor magnet is a motor characterized in that it is magnetized to a number of poles that is an integral multiple of the number of poles of the field magnet. With a metal bush fixed to the rotating shaft
The motor according to claim 1, wherein the field magnet, the magnetic material yoke, the sensor magnet, and the bush included in the rotor are integrated with a resin. The motor according to claim 1, wherein the rotor and the rotating shaft are integrated with a resin. The motor according to claim 1, wherein the bearing is at least two rolling bearings. The housing includes a holder fixed to the one end side in the axial direction of the rotating shaft.
The motor according to claim 1, wherein the circuit board is fixed to the holder, and the position detection element is arranged on a surface of the circuit board facing the sensor magnet. The motor according to claim 5 , wherein the holder is made of a resin and has a terminal inside the resin that is electrically bonded to the circuit board. The motor according to claim 6 , wherein the holder has a connector portion formed of the resin. The motor according to claim 1, wherein the field magnet is attached to the magnetic material yoke. The motor according to claim 1, wherein the field magnet is arranged in a hole formed in the magnetic yoke. A valve timing adjusting device including the motor according to claim 1. The valve timing adjusting device according to claim 10 , further comprising a speed reducer connected to the rotating shaft of the motor.

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