JP2017192160A - Rotor and dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor in which a sensor magnet is hard to break, a position sensor can be installed conveniently, and detection accuracy of rotor position is excellent, and to provide a dynamo-electric machine.SOLUTION: A rotor includes a cylindrical rotor core 12, an annular sensor magnet 2 placed coaxially with the rotor core 12 on one end side Y1 thereof in the axial direction, and a resin 11 covering the sensor magnet 2 and adhering to the rotor core 12. The rotor core 12 has multiple pin insertion holes 62 at different positions in the circumferential direction Z, on one end side Y1 in the axial direction Y. The sensor magnet 2 has multiple pins 21 to be inserted into the pin insertion holes 62 of the rotor core 12, on the other end side Y2 in the axial direction Y, and multiple notches 22 at different positions in the circumferential direction Z, on the other end side Y2 in the axial direction Y.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor of a rotating electrical machine having a structure for fixing a sensor magnet and the rotating electrical machine, and in particular, the sensor magnet is difficult to break, a position sensor can be easily installed, and the position detection accuracy of the rotor is excellent. .

  In a conventional rotating electrical machine, attention has been paid to a rotating electrical machine that mounts an embedded magnet rotor with magnets embedded therein and realizes high efficiency and high torque. In the following description, an embedded magnet rotor (hereinafter referred to as “IPM rotor” using an abbreviation of “Interior Permanent Magnet” in English) is a rotation magnet (hereinafter referred to as “main magnet”), a rotor Is mounted with a magnet for detecting the rotational position (hereinafter referred to as “sensor magnet”). Some sensors detect the magnetic flux of the sensor magnet with a position sensor such as a Hall element to detect the phase of the rotor.

  On the other hand, there is a rotor (hereinafter referred to as “SPM rotor” using an abbreviation of “Surface Permanent Magnet” written in English) on the outer peripheral surface of the rotor. In the SPM rotor, the magnetic flux of the main magnet is often directly detected by a sensor.

  In recent years, in order to respond quickly to customer demands, rotating electrical machines that share both stator parts and are compatible with both IPM rotors and SPM rotors have been developed. The main magnet and the sensor magnet are generally weak against tensile force and easily broken. For this reason, when the magnet is integrally formed, it is necessary to suppress the force applied to the magnet. In particular, when the magnet is subjected to internal pressure, the larger the diameter, the greater the tensile force and the easier it is to crack.

  For example, Patent Document 1 proposes a method of fixing a main magnet by embedding a main magnet in a hole provided in a rotor core and integrally molding with a resin. The rotation detection sensor magnet is fixed to the sensor magnet support member and then integrally molded together with the permanent magnet. Therefore, it is an easy manufacturing and assembly method that does not require screws or the like.

  Moreover, in patent document 1, it has the structure where the outer periphery of a sensor magnet is covered with resin. In this structure, since the molding pressure is received from the outer peripheral side during molding, the force received is a compressive force and the sensor magnet is not easily broken. The main magnet is embedded in the hole of the rotor core, and the molding pressure is not easily broken because it receives only the compressive force in the axial direction.

  Another Patent Document 2 proposes a structure in which a ring-shaped main magnet and a sensor magnet are integrally molded with a resin together with a shaft. In this patent document 2, the end surface of the main magnet is formed in an uneven shape, a resin flow path is secured, and the sensor magnet is cracked by filling the outer periphery with resin before filling the inner periphery of the sensor magnet. Is preventing.

Japanese Patent No. 4669734 JP 2014-187754 A

  In the conventional patent document 1, since the sensor magnet is arranged on the inner circumference side of the main magnet, the position detection sensor must be arranged on the inner circumference of the rotor, the sensor support structure is complicated, and the number of parts is reduced. To increase. In order to increase the detection accuracy of the sensor, it is necessary to reduce the distance between the sensor and the sensor magnet. However, since it is necessary to adjust in the radial direction, dimensional management is difficult.

  Further, when the sensor element is mounted on a substrate and connected to a circuit that stabilizes the sensor signal, it is necessary to bring the substrate, which is a flat plate, closer to the inner periphery of the sensor magnet, which is a cylindrical surface. Furthermore, when the SPM rotor and the IPM rotor are used with a common stator, there is a problem in that there is a restriction that the inner diameter of the magnet of the SPM rotor is equal to the inner diameter of the sensor magnet of the IPM rotor.

  In other conventional patent document 2, the sensor is arranged in the axial direction, but there is a problem that the material selection is limited only when a material that can be manufactured in a complicated shape such as a resin magnet is used for the main magnet. There was a point.

  The present invention has been made to solve the above-described problems, and provides a rotor and a rotating electrical machine in which a sensor magnet is hard to break, a position sensor can be easily installed, and the rotor position detection accuracy is excellent. The purpose is to do.

The rotor of this invention is
A cylindrical rotor core;
An annular sensor magnet disposed coaxially with the rotor core on one end side in the axial direction of the rotor core;
A resin portion that covers the sensor magnet and is fixed to the rotor core;
The rotor core has a plurality of pin insertion holes at different positions in the circumferential direction on one end side in the axial direction,
The sensor magnet has a plurality of pins inserted into the pin insertion holes of the rotor core on the other end side in the axial direction,
A plurality of notches are provided at different positions in the circumferential direction on the other end side in the axial direction.
The rotating electrical machine of the present invention includes the rotor described above,
A stator disposed coaxially with the rotor.

According to the rotor and the rotating electrical machine of the present invention,
The sensor magnet is difficult to break, the position sensor can be easily installed, and the rotor position detection accuracy is excellent.

It is a top view which shows the structure of the rotor of Embodiment 1 of this invention. It is a side view which shows typically the internal structure of the rotor shown in FIG. It is a top view which shows the structure of the outer ring | wheel of the rotor core shown in FIG. It is a top view which shows the structure of the inner ring | wheel of the rotor core shown in FIG. It is a perspective view which shows the structure of the main magnet accommodated in the outer ring | wheel of the rotor core shown in FIG. It is a top view which shows the structure of the sensor magnet of the rotor shown in FIG. It is a side view which shows the structure of the sensor magnet shown in FIG. It is a perspective view which shows the structure of the sensor magnet shown in FIG. FIG. 4 is a cross-sectional view for explaining a relationship between a rotor core and pins in a cross section taken along line AA of the outer ring of the rotor core shown in FIG. FIG. 4 is a cross-sectional view for explaining a relationship between a rotor core and a tapered portion in a cross section taken along line B-B of the outer ring of the rotor core shown in FIG. 3. It is a figure for demonstrating the magnetic flux distribution of the sensor magnet which passes to the Q direction of the rotor shown in FIG. 13, and the structure of a sensor magnet. It is sectional drawing for demonstrating the flow of the resin in the periphery of the sensor magnet shown in FIG. It is explanatory drawing which shows typically the attachment structure of the rotor shown in FIG. It is sectional drawing which shows the structure of the rotary electric machine using the rotor shown in FIG. It is a perspective view which shows the external appearance of the rotary electric machine shown in FIG.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. As the rotor 1 according to the first embodiment, an IPM rotor will be described. FIG. 1 is a plan view showing a configuration of a rotor according to Embodiment 1 of the present invention. FIG. 2 is a sectional side view for schematically explaining the internal structure of the rotor shown in FIG. FIG. 3 is a top view showing the configuration of the outer ring of the rotor core shown in FIG. FIG. 4 is a top view showing the configuration of the inner ring of the rotor core shown in FIG.

  FIG. 5 is a perspective view showing the configuration of the main magnet housed in the outer ring of the rotor core shown in FIG. FIG. 6 is a top view showing the configuration of the sensor magnet of the rotor shown in FIG. FIG. 7 is a side view showing the configuration of the sensor magnet shown in FIG. FIG. 8 is a perspective view showing the configuration of the sensor magnet shown in FIG. FIG. 9 is a view for explaining the magnetic flux distribution of the sensor magnet passing in the Q direction of the rotor shown in FIG. 13 and the configuration of the sensor magnet.

  FIG. 10 is a cross-sectional view for explaining the flow of resin around the sensor magnet shown in FIG. FIG. 11 is a cross-sectional view for explaining the relationship between the rotor core and the pin in the cross section taken along the line AA of the outer ring of the rotor core shown in FIG. 12 is a cross-sectional view for explaining the relationship between the rotor core and the tapered portion in the cross section taken along line BB of the outer ring of the rotor core shown in FIG. FIG. 13 is an explanatory view schematically showing a mounting structure of the rotor shown in FIG. 14 is a cross-sectional view showing a configuration of a rotating electrical machine using the rotor shown in FIG. FIG. 15 is a perspective view showing an appearance of the rotating electrical machine shown in FIG.

  1 and 2, the rotor 1 includes a rotor core 12, a sensor magnet 2, and a resin portion 11. The rotor core 12 includes an outer ring 5, an inner ring 7, and a main magnet 9 described later. The sensor magnet 2 is formed in an annular shape arranged coaxially with the rotor core 12 on one end side Y1 in the axial direction Y of the rotor core 12. The sensor magnet 2 is arranged on the outer side in the radial direction X from the main magnet 9 installed on the rotor core 12. The sensor magnet 2 detects the rotational position of the rotor core 12. The rotor core 12 and the sensor magnet 2 are integrally fixed by the resin portion 11.

  3 and 4, the outer ring 5 and the inner ring 7 are formed in an annular shape. For example, an electromagnetic steel plate is used as the material. The outer ring 5 and the inner ring 7 made of thin plates are laminated in a predetermined thickness in the axial direction Y to form the rotor core 12.

  As shown in FIG. 3, the outer ring 5 includes an insertion hole 61, a pin insertion hole 62, an uneven part 51, a convex part 52, and a space part 53. The insertion hole 61 is a hole for inserting a main magnet 9 described later. A plurality of insertion holes 61 are provided at different locations in the circumferential direction Z. Here, an example in which the number of poles is 10 is shown, and the insertion holes 61 are formed at 10 locations at equal intervals in the circumferential direction Z. In addition, although the example of 10 poles is shown, it is not restricted to this, It can form similarly in other pole numbers.

  The pin insertion hole 62 is a hole formed continuously from both ends of each insertion hole 61. The pin insertion hole 62 is a hole for inserting a pin 21 of the sensor magnet 2 described later. In addition, although the example which forms the pin insertion hole 62 in communication with the insertion hole 61 was shown, it is not restricted to this, The hole different from the insertion hole 61 can also be suitably formed.

  The space 53 is a circular space formed in order to arrange an inner ring 7 described later at the center position of the outer ring 5. A plurality of uneven portions 51 are formed at different locations in the circumferential direction Z and at different locations in the radial direction X. The uneven portion 51 is used for caulking and fixing when laminating the thin outer ring 5. A plurality of convex portions 52 are formed to protrude inward in the radial direction X at different locations in the circumferential direction Z of the inner circumference in the radial direction X of the outer ring 5.

As shown in FIG. 4, the inner ring 7 includes a shaft insertion hole 63, an uneven portion 71, and a recessed portion 72.
The shaft insertion hole 63 is a hole formed at the center position of the inner ring 7. The shaft insertion hole 63 is a hole for inserting a shaft 8 described later. A plurality of uneven portions 71 are formed at different locations in the circumferential direction Z. The concavo-convex portion 71 is used for caulking and fixing when laminating the thin inner ring 7. A plurality of recesses 72 are formed in the inner ring 7 in the radial direction X at locations corresponding to the projections 52 of the outer ring 5 on the outer circumference in the radial direction X of the inner ring 7.

  Therefore, when the inner ring 7 is installed in the space 53 of the outer ring 5, the convex part 52 of the outer ring 5 and the concave part 72 of the inner ring 7 are engaged with each other. And the position shift of the outer ring | wheel 5 and the inner ring | wheel 7 is prevented by the effect | action of rotational torque. Then, the rotor core 12 is formed by inserting the main magnet 9 shown in FIG. 5 into each of the 10 insertion holes 61 of the outer ring 5. Thus, by forming the rotor core 12 with the separate parts of the outer ring 5 and the inner ring 7, the electrolytic corrosion of the rotor 1 is suppressed. Further, as shown in FIG. 5, the main magnet 9 can be formed in a simple shape, and there are no restrictions on the material selection.

  As shown in FIGS. 6, 7, and 8, the sensor magnet 2 includes a pin 21, a notch portion 22, and a taper portion 23. The pins 21 are formed to protrude to the other end side Y2 in the axial direction Y at two different positions in the circumferential direction Z, here, 180 degrees apart. The pin 21 is formed in a cylindrical shape. The pin 21 may have a shape other than a columnar shape, and may be formed in a shape such as a cone or a triangular prism, for example. Moreover, the number of the pins 21 should just be two or more, and is not limited.

  The notch 22 is formed on the other end side Y <b> 2 that is the same as the direction in which the pin 21 is formed in the axial direction Y. The notch 22 is formed at a different position in the circumferential direction Z so as to be recessed on one end side Y1 in the axial direction Y. The notch portions 22 are formed at equal intervals in the circumferential direction Z at the same number as the number of poles. The notch 22 is formed for the purpose of improving the fluidity of the resin part 11 when the rotor core 12 and the sensor magnet 2 are fixed.

  The taper portion 23 is formed on the inner end side of the sensor magnet 2 on the other end side Y <b> 2 that is the same as the direction in which the pin 21 is formed in the axial direction Y. The tapered portion 23 has a shape in which the width in the radial direction X decreases from the one end side Y1 in the axial direction Y toward the other end side Y2 where the pin 21 is formed (particularly, see FIGS. 10 and 12). The sensor magnet 2 is disposed so that the other end side Y <b> 2 in the axial direction Y where the pin 21 is formed faces the upper surface of the rotor core 12. Then, the pin 21 is inserted into a pin insertion hole 62 formed in the outer ring 5.

  Thus, the sensor magnet 2 has a complicated shape such as the notch 22 and the taper 23. For this reason, in order to manufacture efficiently, the material uses the plastic magnet which can mix resin and a magnetic material, and can shape | mold with a metal mold | die. Therefore, since the sensor magnet 2 is formed by a mold, a gate cutting portion 15 described later is inevitably formed at a gate (filling port) for filling the mold with a plastic magnet.

  Here, the detail of the formation position of the notch part 22 of the sensor magnet 2 and the formation position of the gate cutting part 15 of the sensor magnet 2 is demonstrated using FIG. FIG. 9 is a diagram showing a magnetic flux distribution of the sensor magnet 2 passing in the Q direction of the rotor 1 shown in FIG. 13 and a developed view showing the sensor magnet 2 at a location corresponding to the magnetic flux distribution. In the diagram showing the magnetic flux distribution, the horizontal axis is the position in the rotational direction of the rotor 1, and any position is 0 degrees, and the position is expanded in the circumferential direction up to 360 degrees. The vertical axis represents the amount of magnetic flux at each position.

  A position sensor 44 (described later) for detecting the position of the rotor 1 detects a point 17 (hereinafter referred to as a zero cross point 17) where the N pole and the S pole of the magnetic flux of the sensor magnet 2 are switched as shown in FIG. Therefore, the notch 22 needs to be formed at a position that does not overlap with the position of the zero cross point 17 in the circumferential direction Z. Therefore, the notch 22 is formed in the middle position of the plurality of zero cross points 17 of the magnetic flux waveform of the sensor magnet 2 in the circumferential direction Z.

  This is because the thickness of the sensor magnet 2 near the position of the zero cross point 17 is formed to be thick, and a sufficient amount of magnetic flux near the position of the zero cross point 17 is secured. By ensuring the amount of magnetic flux in this way, the position detection accuracy of the position sensor 44 is increased. Therefore, the cutout portion 22 where the thickness of the sensor magnet 2 is thin needs to be formed at a position that does not overlap the position of the zero cross point 17.

  Next, when the sensor magnet 2 is molded into a plastic magnet, a weld line (weld line) 16 is generated between the gates shown above by the merge of the flow of the plastic magnet as shown in FIG. The weld line 16 is formed between the gate cutting part 15 and the gate cutting part 15 in the circumferential direction Z between the gates.

  In order to ensure the strength of the sensor magnet 2, it is necessary to set the weld line 16 so as not to overlap the notch 22. Further, deterioration of the magnetic characteristics of the sensor magnet 2 due to the weld line 16 may affect the position detection accuracy of the position sensor 44. Therefore, it is necessary to set so that the weld line 16 does not overlap the zero cross point 17.

  Therefore, it is necessary to install a position where the weld line 16 of the sensor magnet 2 may be formed at a position where the notch 22 and the zero cross point 17 do not overlap. Specifically, in the circumferential direction Z, the gate cutting part 15 is arranged at the midpoint between the zero cross point 17 adjacent to the circumferential direction Z and the circumferential end surface of the notch part 22 at five places that are half the number of poles. An example is conceivable. If formed in this way, the weld line 16 does not overlap the notch 22, thereby preventing the sensor magnet 2 from being easily broken.

  As shown in FIG. 2, the rotor core 12 and the sensor magnet 2 are fixed by a resin portion 11 to constitute the rotor 1. The resin portion 11 is formed of, for example, a thermoplastic polybutylene terephthalate resin or a thermosetting unsaturated polyester resin. A plurality of hole portions 14 where the sensor magnet 2 is exposed on one end side Y1 in the axial direction Y are formed in the resin portion 11 at different positions in the circumferential direction Z.

  The hole portion 14 corresponds to a portion where a later-described reference pin 30 (see FIG. 10) formed in a mold when filling the resin portion 11 is formed. In order to ensure the accuracy of the position sensor 44 described later, it is necessary to ensure the positional accuracy in the axial direction Y of the sensor magnet 2 near the position of the zero cross point 17.

  For this reason, it is desirable to arrange the reference pin 30 formed on the mold when filling the resin portion 11 at the position of the zero cross point 17 in the circumferential direction Z. That is, the hole 14 inevitably formed by the reference pin 30 is formed at the position of the zero cross point 17 in the circumferential direction Z.

  Next, a method for manufacturing the rotor 1 according to the first embodiment configured as described above will be described. First, an integral mold is prepared, and the outer ring 5 and the inner ring 7 are arranged in the integral mold. Then, the main magnet 9 is inserted into each of the insertion holes 61 of the outer ring 5. Next, the sensor magnet 2 is arranged so that the pin 21 of the sensor magnet 2 faces the pin insertion hole 62 of the outer ring 5. Next, the pin 21 is inserted into the pin insertion hole 62, and the sensor magnet 2 is placed on one end side Y <b> 1 in the axial direction Y of the outer ring 5.

  FIG. 11 is a cross-section corresponding to the position of line AA in FIG. As shown in FIG. 11, the pin 21 of the sensor magnet 2 is inserted into the pin insertion hole 62 formed in the outer ring 5 of the rotor 1. The pin 21 ensures the mounting position of the sensor magnet 2 with respect to the rotor core 12. And a metal mold | die is closed and the resin part 11 is filled inside. The resin portion 11 filled in the mold uniformly covers the entire sensor magnet 2 while flowing through the notch portion 22 provided in the sensor magnet 2.

  The action and effect of the notch 22 and the taper 23 when the resin part 11 is filled will be described with reference to FIGS. FIG. 10 is a cross-sectional view of a portion where the notch 22 of the sensor magnet 2 is formed. 12 is a cross-sectional view corresponding to the position of line BB in FIG. However, although FIG. 3 is a figure before forming the resin part 11, FIG. 12 is a figure after forming the resin part 11. FIG.

  When filling the resin part 11, the resin is filled from the gate part 18 shown in FIG. As shown in FIG. 10, in the vicinity of the sensor magnet 2, the resin flows as shown by the arrows. Since the notch 22 is formed in the sensor magnet 2, the flow of the resin is dispersed, and before the excessive pressure applied to the resin is applied to the sensor magnet 2, the resin is in the radial direction X of the sensor magnet 2. Flows outward. Therefore, it is possible to prevent the sensor magnet 2 from being cracked due to an excessive load of the resin flow.

  Further, as shown in FIG. 10, the taper portion 23 of the sensor magnet 2 is disposed so as to face the direction of the rotor 1. Therefore, the taper portion 23 is pushed up by the resin portion 11 between the sensor magnet 2 and the rotor core 12 in one end side Y1 in the axial direction Y, that is, in a direction away from the rotor core 12. The taper portion 23 has a function of pushing up the sensor magnet 2 to the one end side Y1 in the axial direction Y by the flow filled with the resin portion 11.

  Then, one end Y1 in the axial direction Y of the sensor magnet 2 is pressed against a reference pin 30 provided on the mold and stops. Therefore, the positional accuracy of the sensor magnet 2 in the axial direction Y is ensured. Thus, even if the sensor magnet 2 floats to one end Y1 (upper side) in the axial direction Y, the sensor magnet 2 maintains the positional relationship with respect to the rotor core 12 by the pin 21 inserted into the pin insertion hole 62. .

  Then, filling of the resin part 11 is completed and the resin part 11 is hardened. And the hole part 14 which the sensor magnet 2 exposes is formed as a trace by which the reference | standard pin 30 was pressed. The holes 14, that is, the reference pins 30 are evenly arranged in the circumferential direction Z so that the pressing force applied to the sensor magnet 2 is not biased. As shown in FIG. 1, the rotor core 12 and the sensor magnet 2 are fixed and integrated to form the rotor 1.

  Next, the rotating electrical machine 100 using the rotor 1 formed as described above will be described with reference to FIGS. In FIG. 13, the rotor 1 is supported by a shaft 8 that passes through the shaft insertion hole 63 of the rotor 1 and a bearing 13 that supports the shaft 8 up and down across the rotor 1. When the rotor 1 is driven, the rotational motion is transmitted to the external device connected via the shaft 8.

  As described above, since the rotor 1 in which the rotor core 12 and the sensor magnet 2 for detecting the rotational position are integrally formed by the resin portion 11 is used, even if the rotor 1 is driven to rotate, the rotor core 12 and the sensor magnet are used. 2 is not displaced.

  As shown in FIG. 14, the stator 4 includes a stator core 40, an insulator 41, a coil 42, and a resin portion 43. A coil 42 wound around the stator core 40 via an insulator 41 is installed. These are molded by the resin portion 43 and configured. The rotating electrical machine 100 is arranged such that the stator 4 is coaxial with the rotor 1. The external appearance of the rotating electrical machine 100 is configured as shown in FIG.

  The rotating electrical machine 100 is provided with a position sensor 44 that detects the position of the rotor 1 in the rotational direction. The position sensor 44 is mounted on a sensor substrate 45, and the sensor substrate 45 is welded to the support portion 46. The support portion 46 is welded and fixed to the resin portion 43 of the stator 4. The support part 46 is configured by injection molding a resin in a mold. The shape of the support portion 46 can be formed by easily adjusting the positional relationship of the position sensor 44 with certainty by appropriately setting the mold. That is, the position sensor 44 and the sensor magnet 2 can be brought close to the point where they interfere with each other.

  In the first embodiment, the example in which the stator 4 is combined with the rotor 1 that is an IPM rotor has been described. However, the stator 4 having the same configuration as that shown in FIG. Even if it changes to, since the positional relationship of the position sensor 44 can be utilized effectively, it can be comprised as a rotary electric machine.

  Moreover, although the example which forms the rotor core 12 with the outer ring | wheel 5 and the inner ring | wheel 7 was shown, it is not restricted to this, The rotor core 12 is formed from one component with which the outer ring | wheel 5 and the inner ring | wheel 7 were united. However, the sensor magnet 2 can be formed in the same manner, and the same effect can be obtained.

  Moreover, although the taper part 23 showed the example formed in the radial inside of the sensor magnet 2, it is not restricted to this, From the other end side Y2 of the axial direction Y, from the one end side Y1 of the axial direction Y A tapered portion in which the width in the radial direction X decreases toward the other end Y2 may be provided on the outer side in the radial direction of the sensor magnet 2.

  Moreover, although the example which welds and fixes the sensor board | substrate 45 and the support part 46, and the support part 46 and the stator 4 was shown, it will not be restricted to this, If it is the method of fixing a plane and a plane together, It can be formed similarly by using any method and configuration such as screwing and bonding, and the same effect can be obtained.

  Moreover, although the example which forms the support part 46 with resin is shown, it is not restricted to this, For example, it is also possible to form with the sheet metal component shape | molded with a press.

  According to the rotor and the rotating electrical machine of the first embodiment configured as described above, the rotor is fixed by the integral mold while the positional relationship between the sensor magnet and the rotor core is maintained by the pins inserted into the rotor core. Therefore, the sensor magnet can be installed with excellent positional accuracy with respect to the rotor core. Moreover, the operation | work which attaches a sensor magnet and a rotor core separately, and the component for it are unnecessary.

  Furthermore, since the rotor core and the sensor magnet are integrally formed, the rotating electric machine does not cause rattling due to driving, and therefore noise during driving can be reduced.

  Further, since the resin portion filled in the mold flows through the notch portion by the notch portion formed in the sensor magnet, the sensor magnet can be covered all over, and the sensor magnet is hardly broken.

  In addition, a plurality of notches are formed at intermediate positions between the positions of a plurality of zero cross points of the magnetic flux waveform of the sensor magnet in the circumferential direction, so that the position detection accuracy of the position sensor is not reduced. The sensor magnet can be prevented from cracking due to pressure.

  The sensor magnet has, on the other end side in the axial direction, a tapered portion in which the radial width decreases from one end side in the axial direction toward the other end side, and on the end surface on one end side in the axial direction of the resin portion, Since the hole where the sensor magnet is exposed is formed, when the mold is filled with the resin part, the sensor magnet is pushed up to the other end in the axial direction and pressed against the reference pin of the mold to form the hole. Is done. As a result, the distance between the sensor magnet and the rotor core is kept constant. Therefore, it becomes easy to manage the distance between the sensor magnet and the position sensor for position detection.

  Moreover, since the taper portion is formed inside the sensor magnet in the radial direction, the sensor magnet is reliably pressed against the reference pin.

Moreover, since the hole is formed at the position of the zero cross point of the magnetic flux waveform of the sensor magnet,
The distance between the sensor magnet and the rotor core is reliably kept constant.

  The sensor magnet is formed of a plastic magnet. The sensor magnet has a plurality of gate cutting portions formed in the plastic magnet at different positions in the circumferential direction, and an intermediate position between the adjacent gate cutting portions in the circumferential direction. Is formed so as not to be arranged at the positions of a plurality of zero cross points of the magnetic flux waveform of the notch and the sensor magnet, so that the weld line can be prevented from being formed at the notch and the zero cross point. The strength of the sensor increases, and the accuracy of position detection can be secured.

  Further, since the sensor magnet is formed on the outer side in the radial direction than the main magnet installed in the rotor core, the configuration becomes simple.

  Further, since the rotor is formed from the outer ring and the inner ring arranged coaxially inside the outer ring, the electrolytic corrosion of the rotor can be suppressed.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

1 rotor, 11 resin part, 12 rotor core, 13 bearing, 14 hole part,
15 gate cutting part, 16 weld line, 17 zero cross point,
2 sensor magnet, 21 pin, 22 notch, 23 taper,
30 reference pins, 4 stators, 40 stator cores, 41 insulators,
42 coil, 43 resin part, 44 position sensor, 45 sensor substrate, 46 support part,
5 outer ring, 51 uneven part, 52 convex part, 53 space part, 61 insertion hole,
62 pin insertion hole, 63 shaft insertion hole, 7 inner ring, 71 uneven portion, 72 recessed portion,
8 shaft, 9 main magnet, 100 rotating electrical machine, Z circumferential direction, X radial direction,
Y axis direction, Y1 one end side, Y2 other end side.

Claims (10)

A cylindrical rotor core;
An annular sensor magnet disposed coaxially with the rotor core on one end side in the axial direction of the rotor core;
A resin portion that covers the sensor magnet and is fixed to the rotor core;
The rotor core has a plurality of pin insertion holes at different positions in the circumferential direction on one end side in the axial direction, and the sensor magnet is inserted into the pin insertion hole of the rotor core on the other end side in the axial direction. Multiple pins,
A rotor having a plurality of notches at different positions in the circumferential direction on the other end side in the axial direction. 2. The rotor according to claim 1, wherein the notch is formed at an intermediate position between a plurality of zero cross points of a magnetic flux waveform of the sensor magnet in the circumferential direction. The sensor magnet has, on the other end side in the axial direction, a tapered portion in which a radial width decreases from one end side in the axial direction toward the other end side,
The rotor according to claim 1, wherein the resin portion is formed with a hole portion through which the sensor magnet is exposed on one end side in the axial direction. The rotor according to claim 3, wherein the tapered portion is formed on the inner side in the radial direction of the sensor magnet. The rotor according to claim 3 or 4, wherein the hole is formed at a position of a zero cross point of a magnetic flux waveform of the sensor magnet. The sensor magnet is formed of a plastic magnet,
In the sensor magnet, a plurality of gate cutting portions in formation with the plastic magnet are formed at different positions in the circumferential direction,
The intermediate position of the gate cutting part adjacent in the circumferential direction is formed so as not to be arranged at the positions of a plurality of zero cross points of the magnetic flux waveform of the notch part and the sensor magnet. The rotor according to item 1. The rotor according to any one of claims 1 to 6, wherein the sensor magnet is formed on a radially outer side than a main magnet installed on the rotor core. The rotor according to any one of claims 1 to 7, wherein the rotor is formed of an annular outer ring and an annular inner ring disposed coaxially with the outer ring inside the outer ring. A rotor according to any one of claims 1 to 8,
A rotating electrical machine comprising the rotor and a stator arranged coaxially. The rotating electrical machine according to claim 9, wherein a position sensor for detecting the position of the rotor is formed at a position facing the sensor magnet in the axial direction.

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