JP7353930B2 - Rotating electrical machine system - Google Patents

Description

The present invention relates to a rotating electrical machine system.

BACKGROUND ART Rotary electric machines have been known that include a rotor having a plurality of field magnets, a stator having a coil that generates a rotating magnetic field, and a plurality of sensors that detect the rotational position of the rotor. The multiple sensors include multiple first sensors and one second sensor. The plurality of first sensors detect a plurality of rotational positions of the rotor in order to control energization to the coils of the stator when rotating the rotor. A second sensor detects an absolute predetermined rotational position of the rotor, such as for starting an internal combustion engine coupled to the rotor. The second sensor detects one of the plurality of magnets of the rotor (different magnetic magnet) having some different magnetic parts having different magnetic properties with respect to the magnet main body.

JP2009-89588A

By the way, in the above-mentioned rotating electric machine, the second sensor detects the absolute predetermined rotational position of the rotor by detecting the position of the different magnetic part of the different magnetic magnet. Here, for example, if a part of a magnet that has already been magnetized with one type of magnetism is later magnetized with the other magnetism to form a different magnetic part, the position accuracy of the magnetic characteristics of the different magnetic part will be distorted. , the position detection accuracy of the second sensor may be lower than the position detection accuracy of the first sensor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotating electrical machine system that can improve the accuracy of detecting an absolute predetermined rotational position of a rotor.

In order to solve the above problems, a rotating electric machine system according to the present invention includes a rotating electric machine and a control device, and the rotating electric machine has a plurality of magnets in which different magnetic poles are arranged alternately along the rotation direction. A rotor, a stator that generates a magnetic field that rotates the rotor, and a plurality of magnetic sensors that are arranged to face the plurality of magnets and output signals according to the magnetic poles of each of the plurality of magnets. , the plurality of magnets have a main magnetic part that is a main body, and have magnetic properties different from those of the main magnetic part, and are arranged from an end face of the main magnetic part on the rear side in the rotational direction to the front side in the rotational direction. The plurality of magnetic sensors are arranged at positions facing the rotation orbit of the different magnetic parts of the different magnetic magnet, and the plurality of magnetic sensors are arranged opposite to the rotation orbit of the different magnetic parts of the different magnetic parts, and a first magnetic sensor that outputs a signal according to a magnetic property and a signal according to a magnetic property of the different magnetic part, and a first magnetic sensor that faces the rotational orbit of the main magnetic part and does not face the rotational orbit of the different magnetic part. at least one second magnetic sensor arranged at a position that outputs a signal according to the magnetic property of the main magnetic part without outputting a signal according to the magnetic property of the different magnetic part, and the second magnetic sensor outputs a signal according to the magnetic property of the main magnetic part , The apparatus is configured such that after the first magnetic sensor starts outputting a signal according to the magnetic property of the different magnetic part, the first magnetic sensor starts outputting a signal according to the magnetic property of the different magnetic part. The timing at which the detection preparation ends is defined as the detection preparation start timing, and after the detection preparation start timing is detected, the timing at which the first magnetic sensor outputs a signal corresponding to the switching of the magnetic poles between the magnets adjacent in the rotational direction. is an absolute position detection timing, and the absolute predetermined rotational position of the rotor is obtained in accordance with the absolute position detection timing .

In the above configuration, the direction of the magnetic pole of the main magnetic part and the direction of the magnetic pole of the different magnetic part may be opposite.

In the above configuration, the material of the main magnetic part and the material of the different magnetic part may be different.

According to the present invention, a heteromagnetic magnet having a heteromagnetic portion disposed at a position shifted toward the front side in the rotational direction from the end face of the main magnetic portion on the rear side in the rotational direction among the plurality of magnets; By providing a first magnetic sensor that outputs a signal corresponding to each of the magnetic portion and the different magnetic portion, it becomes possible to accurately detect the absolute predetermined rotational position of the rotor.

FIG. 1 is a perspective view of a rotating electrical machine and a rotating electrical machine system in an embodiment of the present invention. FIG. 2 is a plan view of the rotating electrical machine according to the embodiment of the present invention, with the rotor removed, as viewed from the direction of the rotating shaft. FIG. 2 is a side view of the rotor of the rotating electric machine according to the embodiment of the present invention, cut along a plane parallel to the rotation axis direction and viewed from a direction orthogonal to the rotation axis direction. FIG. 1 is a perspective view of a stator of a rotating electric machine in an embodiment of the present invention. FIG. 2 is a developed view of the inner peripheral side of the rotor of the rotating electric machine according to the embodiment of the present invention. It is a figure which shows the example of the time change of the signal output from 1st to 4th Hall IC when the rotor of the rotating electrical machine in embodiment of this invention rotates. FIG. 3 is a diagram showing an example of a temporal change in a signal output from a first Hall IC around a different magnetic magnet during rotation of a rotor of a rotating electric machine according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a temporal change in a signal output from a first Hall IC around a different magnetic magnet during rotation of a rotor of a rotating electric machine in a comparative example of an embodiment of the present invention. The figure which shows the example of the time change of the signal output from the 1st Hall IC in the vicinity of a different magnetism magnet when the rotor of the rotating electric machine rotates in the 1st modification of embodiment of this invention. FIG. 6 is a developed view of the inner peripheral side of a rotor of a rotating electrical machine in a second modification of the embodiment of the present invention. The figure which shows the example of the time change of the signal output from 1st to 4th Hall IC when the rotor of the rotating electric machine rotates in the 2nd modification of embodiment of this invention. FIG. 6 is a developed view of the inner peripheral side of the rotor of the rotating electric machine in a third modification of the embodiment of the present invention. The figure which shows the example of the time change of the signal output from 1st to 4th Hall IC when the rotor of the rotating electric machine rotates in the 3rd modification of embodiment of this invention.

Hereinafter, a rotating electrical machine and a rotating electrical machine system according to embodiments of the invention will be described with reference to the accompanying drawings.

<Rotating electrical machinery>
FIG. 1 is a perspective view of a rotating electrical machine 1 and a rotating electrical machine system 100. FIG. 2 is a plan view of the rotary electric machine 1 with the rotor 4 removed, viewed from the rotation axis direction Z. FIG. 3 is a side surface of the rotor 4 of the rotating electric machine 1 cut along a plane parallel to the rotation axis direction Z and viewed from a direction orthogonal to the rotation axis direction Z. The rotational axis direction Z is a direction parallel to the rotational axis of the rotating electric machine 1.
The rotating electrical machine 1 and the rotating electrical machine system 100 of the embodiment are mounted on a vehicle such as a motorcycle, for example, and start an internal combustion engine (not shown) of the vehicle and generate electricity using the power of the internal combustion engine. The rotating electrical machine 1 is a three-phase brushless type and outer rotor type rotating electrical machine. The rotating electrical machine system 100 includes a rotating electrical machine 1 and a control device 101.

As shown in FIGS. 1, 2, and 3, the rotating electric machine 1 includes a stator 2, a rotor 4, and a position detection sensor unit 6. The stator 2 is fixed to, for example, a crankcase (not shown) of an internal combustion engine. The rotor 4 is fixed to, for example, a crankshaft (not shown) of an internal combustion engine. The position detection sensor unit 6 detects the rotational position of the rotor 4.
In the following explanation, the axially inner side (the inner side shown in each figure) of the rotation axis direction Z is the side where the crankshaft (not shown) extends, and the side where the rotor 4 is fixed to the crankshaft. . In the rotation axis direction Z, the axially outer side (the outer side shown in each figure) is the opposite side to the axially inner side.

FIG. 4 is a perspective view of the stator 2.
As shown in FIGS. 1 to 4, the stator 2 includes a stator core 2A and a plurality of coils 10.
The stator core 2A is formed of, for example, laminated electromagnetic steel sheets. The stator core 2A includes a main body portion 2a and a plurality of teeth portions 2b. The outer shape of the main body portion 2a is, for example, annular. The plurality of teeth portions 2b radially protrude radially outward from the outer peripheral surface of the main body portion 2a. Each tooth portion 2b includes a claw piece 3 that projects from the tip end in the protruding direction to both sides in the circumferential direction. The outer shape of the claw piece 3 is, for example, T-shaped. For example, in the case of a rotating electric machine 1 with 12 poles and 18 slots, the plurality of teeth parts 2b are 18 teeth parts 2b.

One or two notches 7 are formed in the claw pieces 3 of some of the teeth parts 2b among the plurality of teeth parts 2b. The notch portion 7 is formed, for example, so that a portion of the end portion of the claw piece 3 in the circumferential direction from the center portion in the rotation axis direction Z to the axially outer end is cut out.
For some teeth portions 2b that are adjacent to each other in the circumferential direction, the notch portions 7 that form a pair so as to be adjacent to each other in the circumferential direction are rectangular shaped so as to straddle two claw pieces 3 that are adjacent to each other in the circumferential direction. A groove portion 8 is formed. The three pairs of notches 7 formed so as to be continuously arranged in the circumferential direction form three grooves 8 that are continuously arranged in the circumferential direction.
In the three grooves 8 formed by the three pairs of notches 7, a first leg 61a, a second leg 61b, and a third leg 61c of a position detection sensor unit 6, which will be described later, are arranged.

The plurality of coils 10 are mounted so as to be wound around the plurality of teeth portions 2b via insulators (not shown). As shown in FIGS. 1 and 2, the terminal portions of the plurality of coils 10 are connected to the first ends of the plurality of lead wires 21a. The plurality of lead wires 21a are, for example, three lead wires 21a associated with three phases, U phase, V phase, and W phase. The plurality of lead wires 21a are bundled by a protective tube 22a and arranged in an arc shape along the circumferential direction of the stator 2 at the outer end in the axial direction of the stator 2. The second ends of the plurality of lead wires 21 a are led out of the crankcase of the internal combustion engine via a grommet 23 provided in the crankcase (not shown), and are connected to the control device 101 . For example, in the case of a rotating electrical machine 1 with 12 poles and 18 slots, the plurality of coils 10 are 18 coils 10.

At the outer end of the stator 2 in the axial direction, a plurality of sensor wires 21b pulled out from a sensor case 30, which will be described later, are bundled together by a protective tube 22b and routed in an arc shape along the circumferential direction of the stator 2. . The plurality of sensor wires 21b are connected to first to fourth Hall ICs 38a, 38b, 38c, and 38d in the interior space of the sensor case 30, which will be described later. The plurality of sensor wires 21b are led out of the crankcase (not shown) of the internal combustion engine via a grommet 24 provided in the crankcase, and are connected to the control device 101.
A plurality of lead wires 21a and sensor wires 21b arranged at the axially outer end of the stator 2 are held at the axially outer end of the stator core 2A via clips 25.

FIG. 5 is a developed view of the inner peripheral side of the rotor 4. As shown in FIG. FIG. 6 is a diagram showing an example of temporal changes in signals output from the first to fourth Hall ICs 38a, 38b, 38c, and 38d during rotation of the rotor 4 in the rotating electrical machine 1 with 12 poles and 18 slots. FIG. 7 is a diagram showing an example of a temporal change in a signal output from the first Hall IC 38a around the different magnetic magnet 16c when the rotor 4 rotates.
As shown in FIGS. 1, 3, and 5, the rotor 4 includes a rotor yoke 12 and a boss portion 14. The outer shape of the rotor yoke 12 is, for example, a cylindrical shape with a bottom. The rotor yoke 12 is made of a magnetic material. The boss portion 14 is coaxially fixed to the bottom wall 12a of the rotor yoke 12. The boss portion 14 is connected to the crankshaft of the internal combustion engine and rotates integrally with the crankshaft.

The rotor 4 includes a plurality of magnets 16 attached to the inner peripheral surface of the rotor yoke 12. The plurality of magnets 16 are arranged at equal intervals along the circumferential direction of the rotor yoke 12. The outer shape of each magnet 16 is, for example, a plate-like segment type curved along the circumferential direction of the rotor yoke 12 or a rectangular plate-like square type. At least a part of the thickness direction of each magnet 16, such as a segment type or square type, is parallel to the radial direction of the rotor yoke 12. The magnetization direction of each magnet 16 is parallel to the thickness direction. Among the plurality of magnets 16, the magnetization directions of adjacent magnets 16 in the circumferential direction are reversed. In other words, the magnetic poles of two magnets 16 that are adjacent to each other in the circumferential direction are opposite in direction.

For example, the magnet 16 in which the inner circumferential side of the rotor 4 is magnetized with an N pole and the outer circumferential side with an S pole is referred to as the N-pole magnet 16a, and the magnet 16 in which the inner circumferential side of the rotor 4 is magnetized with an S pole and the outer circumferential side is magnetized with an N pole. In the case of the S-pole magnet 16b, the plurality of N-pole magnets 16a and S-pole magnets 16b are arranged alternately in the circumferential direction. The plurality of magnets 16 are, for example, 12 magnets 16 in the case of a rotating electrical machine 1 with 12 poles and 18 slots.

One predetermined magnet 16 among the plurality of magnets 16 is a heteromagnetic magnet 16c that includes a main magnetic part 18 and a different magnetic part 19 so that some magnetic properties are different from the main part. The different magnetic part 19 has magnetic properties different from those of the main magnetic part 18 by having a magnetization direction opposite to that of the main magnetic part 18 or by being formed of a material different from that of the main magnetic part 18. .

For example, the different magnetic magnet 16c includes a main magnetic part 18 and a different magnetic part 19 having mutually different magnetization directions. The different magnetic magnets 16c are adjacent to the N-pole magnets 16a on both sides in the circumferential direction. In the main magnetic part 18, the inner circumferential side of the rotor 4 is magnetized with an S pole and the outer circumferential side is magnetized with an N pole, similar to the S-pole magnet 16b. The pole and outer circumferential side are magnetized to the S pole. As a result, in the rotor 4, the different magnetic magnet 16c is arranged between a specific set of N-pole magnets 16a, 16a arranged in the circumferential direction, and between the N-pole magnets 16a, 16a arranged in other combinations in the circumferential direction. An S-pole magnet 16b is disposed at.

As shown in FIGS. 5 and 7, the different magnetic part 19 of the different magnetic magnet 16c is provided at the end on the inner circumferential side of the inner circumferential side and the outer circumferential side in the thickness direction of the different magnetic magnet 16c. The different magnetic part 19 is exposed to the inner circumferential side from the inner circumferential end surface (inner circumferential surface) 16A of the different magnetic magnet 16c.
The different magnetic part 19 is arranged in the rotation direction RD from the end surface (rear side end surface) 16B of the different magnetic magnet 16c on the rear side of the front side and rear side of the rotor 4 rotation direction (that is, the rotation direction of the plurality of magnets 16) RD. It is located far away in front of the Thereby, the rear end surface 16B of the different magnetic magnet 16c is the same as the end surface (rear end surface) 18A of the main magnetic part 18 on the rear side in the rotation direction RD. The rear end surface 19A of the different magnetic part 19 is separated from the rear end surface 16B of the different magnetic magnet 16c and the rear end surface 18A of the main magnetic part 18 toward the front side in the rotation direction RD.

For example, the different magnetic part 19 includes an end of the different magnetic magnet 16c on the front side in the rotational direction RD and an end of the different magnetic magnet 16c on the axially outer side of the axially inner and axially outer sides in the rotational axis direction Z. It is set in. The different magnetic portion 19 includes an end face (front end face) 16C of the different magnetic magnet 16c on the front side in the rotation direction RD and an end face (axial outer end face) 16D of the different magnetic magnet 16c on the axially outer side in the rotation axis direction Z. exposed from each.

When looking at the plurality of magnets 16 on the inner circumferential side from the inner side in the radial direction of the rotor 4 to the outer side in the radial direction, the N pole and the S pole are alternately arranged in the circumferential direction except on the axially outer side in the rotation axis direction Z. are placed side by side. On the other hand, on the outside in the axial direction, the different magnetic portion 19 of the different magnetic magnet 16c and one magnet 16 (for example, N-pole magnet 16a) that is continuously aligned with the different magnetic magnet 16c on the front side in the rotation direction RD have the same magnetic poles. (for example, N poles) are arranged continuously.
The inner peripheral side and axially outer areas of the plurality of magnets 16 are areas for defining the ignition timing of the internal combustion engine that corresponds to an absolutely predetermined rotational position of the rotor 4. Areas other than the inner circumferential side and the axially outer side of the plurality of magnets 16 are mainly areas for detecting to define the commutation timing of energization to the coil 10.

<Position detection sensor unit>
As shown in FIGS. 1 to 3, the position detection sensor unit 6 includes a sensor case 30 and first to fourth Hall ICs 38a, 38b, 38c, and 38d.
Sensor case 30 is arranged axially outside of stator core 2A. Sensor case 30 is made of resin material. The sensor case 30 accommodates a plurality of circuit boards (not shown) on which first to fourth Hall ICs 38a, 38b, 38c, and 38d are mounted.

The sensor case 30 includes an outer frame member 60 and first to third leg portions 61a, 61b, and 61c.
The outer shape of the outer frame member 60 is, for example, a bottomed cylindrical shape that is curved along the outer periphery of the stator core 2A. The outer frame member 60 includes a wiring guide 68 integrally provided so as to extend radially inward. The wiring guide 68 bundles the plurality of sensor wires 21b drawn out from the outer frame member 60. The wiring guide 68 includes a bolt seat 69 on the inside in the radial direction. The wiring guide 68 is fixed to the stator core 2A by fastening with a bolt 71 inserted into a bolt hole (not shown) formed in a bolt seat 69.
The outer frame member 60 includes a tongue portion 73 that projects radially outward. The outer frame member 60 is fixed to a crankcase (not shown) of an internal combustion engine by fastening with bolts (not shown) inserted into bolt holes 73a formed in the tongue portion 73.

The first to third leg portions 61a, 61b, and 61c are integrally provided so as to protrude inward in the axial direction from the outer frame member 60. The outer shape of each leg portion 61a, 61b, 61c is, for example, a rectangular tube shape with a bottom. The first to third leg portions 61a, 61b, and 61c are inserted into three groove portions 8 formed by three pairs of notch portions 7 of the stator 2. The radially outer surface of each of the first to third leg portions 61a, 61b, and 61c is arranged flush with the radially outer surface of the claw piece 3 of the stator 2.

The first to third leg portions 61a, 61b, and 61c are sequentially arranged along the circumferential direction from the rear side to the front side in the rotational direction RD of the rotor 4. A circuit board (not shown) on which the first Hall IC 38a and the second Hall IC 38b are mounted is housed in the internal space of the first leg 61a. For example, the first Hall IC 38a and the second Hall IC 38b are arranged along the rotation axis direction Z. The first Hall IC 38a is arranged axially outer than the second Hall IC 38b.

A circuit board (not shown) on which a third Hall IC 38c is mounted is accommodated in the internal space of the second leg portion 61b. A circuit board (not shown) on which a fourth Hall IC 38d is mounted is accommodated in the internal space of the third leg portion 61c. For example, the third Hall IC 38c and the fourth Hall IC 38d are arranged at the same position in the rotation axis direction Z as the second Hall IC 38b.
The first Hall IC 38a, the second Hall IC 38b, the third Hall IC 38c, and the fourth Hall IC 38d are arranged at intervals of 120 electrical degrees in the circumferential direction.

As shown in FIG. 5, each Hall IC 38a, 38b, 38c, and 38d is arranged to face each magnet 16 of the rotor 4. The first Hall IC 38a is disposed at a first position M1 in the rotation axis direction Z, facing the different magnetic part 19 of the different magnetic magnet 16c in the radial direction. The first position M1 in the rotation axis direction Z is a position radially facing a part of the rotation orbit of the different magnetic part 19 as the rotor 4 rotates. The second to fourth Hall ICs 38b, 38c, and 38d are arranged at a second position M2 in the rotation axis direction Z that does not face the different magnetic part 19 of the different magnetic magnet 16c in the radial direction. The second position M2 in the rotational axis direction Z is, for example, radially opposite to each part of the rotational orbit of the central part of each magnet 16 and the rotational orbit of the main magnetic part 18 of the different magnetic magnet 16c as the rotor 4 rotates. It's the location.

The first to fourth Hall ICs 38a, 38b, 38c, and 38d are connected to a plurality of sensor wires 21b via a plurality of circuit boards (not shown) in the inner space of the sensor case 30.
As shown in FIGS. 1 and 2, the inner space of the sensor case 30 that accommodates a plurality of circuit boards (not shown) on which the first to fourth Hall ICs 38a, 38b, 38c, and 38d are mounted is filled with agent 90 is filled. Filler 90 seals the interior space of sensor case 30 .

<Detection of rotor rotational position>
As shown in FIGS. 6 and 7, each of the first to fourth Hall ICs 38a, 38b, 38c, and 38d has a value of "1" or "0" depending on the magnetic pole of the portion of each magnet 16 facing each other in the radial direction. Outputs the signal. For example, each Hall IC 38a, 38b, 38c, and 38d outputs a signal of "1" when facing the north pole part in the radial direction, and outputs a signal of "0" when facing the south pole part in the radial direction. Output a signal.

The first Hall IC 38a outputs a first signal P corresponding to the magnetic poles of all the magnets 16 including the main magnetic part 18 and the different magnetic part 19 of the different magnetic magnet 16c. The second to fourth Hall ICs 38b, 38c, and 38d are sequentially associated with three phases, U-phase, V-phase, and W-phase, and the portions other than the different magnetic part 19 of the different magnetic magnet 16c among all the magnets 16 A second signal U, a third signal V, and a fourth signal W are output according to the magnetic poles of. The first Hall IC 38a and the second Hall IC 38b are arranged along the rotation axis direction Z, so that the first signal P output from the first Hall IC 38a and the second signal P output from the second Hall IC 38b are The two signals U are the same for all the magnets 16 other than the different magnetic portion 19 of the different magnetic magnet 16c.

The control device 101 is, for example, a software functional unit that functions by executing a predetermined program by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) that includes a processor such as a CPU, a ROM (Read Only Memory) that stores programs, a RAM (Random Access Memory) that temporarily stores data, and electronic circuits such as a timer. . Note that at least a portion of the control device 101 may be an integrated circuit such as an LSI (Large Scale Integration).

The control device 101 controls the rotation of the rotor 4 based on each signal P, U, V, W output from the first to fourth Hall ICs 38a, 38b, 38c, and 38d. The control device 101 receives each signal P, U, V, and W as a rotational position signal for grasping the rotational position of the rotor 4. The control device 101 controls the commutation timing for energization of the three-phase coil 10 using the second signal U, third signal V, and fourth signal W output from the second to fourth Hall ICs 38b, 38c, and 38d. . The control device 101 controls the ignition at the time of starting the internal combustion engine using the first signal P, second signal U, third signal V, and fourth signal W output from the first to fourth Hall ICs 38a, 38b, 38c, and 38d. Controls timing and fuel injection timing.

For example, when the rotor 4 is driven to rotate, the control device 101 uses a signal group S (P, U, V, W) that is a combination of a first signal P, a second signal U, a third signal V, and a fourth signal W to crank the crank. An absolute predetermined rotational position of the rotor 4 that is associated with a predetermined state of the shaft or a predetermined position (for example, top dead center, etc.) of a piston (not shown) connected to the crankshaft is grasped.

As shown in FIGS. 5, 6, and 7, first, when the first Hall IC 38a and the second Hall IC 38b are aligned in the rotational axis direction Z, the first Hall IC 38a In the undetected region, the first signal P of the first Hall IC 38a and the second signal U of the second Hall IC 38b match. On the other hand, in the region where the first Hall IC 38a detects the different magnetic part 19, the first signal P of the first Hall IC 38a and the second signal U of the second Hall IC 38b are different. Thereby, the timing at which the first Hall IC 38a faces the different magnetic part 19 can be detected.

Here, the control device 101 sets the timing at which detection of the different magnetic part 19 of the different magnetic part 19 of the different magnetic magnet 16c ends after the first Hall IC 38a starts detecting the different magnetic part 19 as the detection preparation start timing PD0. At the detection preparation start timing PD0, for example, the signal group S (P, U, V, W) changes from the first signal group S1 (P, U, V, W) = (1, 0, 1, 1) to the second signal group S (P, U, V, W) = (1, 0, 1, 1). This is the timing at which the signal group S2 (P, U, V, W) = (0, 0, 0, 1) is switched.

Next, after detecting the detection preparation start timing PD0, the control device 101 sets the timing at which the switching of the magnetic poles between the circumferentially adjacent magnets 16 is detected by the first Hall IC 38a as the absolute position detection timing PD. . The absolute position detection timing PD is, for example, when the signal group S (P, U, V, W) is changed from the second signal group S2 (P, U, V, W) = (0, 0, 0, 1) to the third signal group S (P, U, V, W). This is the timing at which the signal group S3 (P, U, V, W) = (1, 1, 0, 1) is switched.
Then, the control device 101 sets the ignition timing and fuel injection timing of the internal combustion engine according to the absolute position detection timing PD when starting the internal combustion engine.

As shown in FIG. 7, after the control device 101 detects the detection preparation start timing PD0 caused by the different magnetic portion 19 of the different magnetic magnet 16c, the control device 101 detects the detection preparation start timing PD0 caused by the switching of the magnetic poles between the circumferentially adjacent magnets 16. Detect absolute position detection timing PD. As a result, even if, for example, the positional accuracy of the magnetic properties of the different magnetic portion 19 is lower than the positional accuracy of the magnetic properties of the other magnets 16 other than the different magnetic magnet 16c, the absolute predetermined rotation of the rotor 4 is ensured. The position can be grasped with high precision.
For example, the different magnetic part 19 of the different magnetic magnet 16c is formed by later magnetizing a part of the main magnetic part 18 that has already been magnetized. Even if the positional accuracy of the characteristic decreases and the error dPD0 of the detection preparation start timing PD0 increases, the absolute position detection timing PD can be detected accurately with a smaller error.

When operating the rotating electrical machine 1 as a generator after starting the internal combustion engine, the control device 101 charges a battery (not shown) with the power generated by the rotation of the rotor 4 or directly connects it to various devices (not shown). ). For example, the control device 101 controls the energization switching timing of an inverter (not shown) connected to the rotating electric machine 1 according to the combination of the second signal U, the third signal V, and the fourth signal W. Charge the battery connected to the inverter.

<Comparison example of rotating electrical machinery>
FIG. 8 is a diagram showing an example of a temporal change in a signal output from the first Hall IC 38a around the different magnetic magnet 16d during rotation of the rotor 4A of the rotating electric machine 1A in a comparative example of the embodiment.
The difference between the rotating electrical machine 1A in the comparative example and the rotating electrical machine 1 in the embodiment is the position of the different magnetic part 19 in one predetermined magnet 16. The rotating electrical machine 1A in the comparative example includes a rotor 4A having a different magnetic magnet 16d instead of the rotor 4 including the different magnetic magnet 16c of the rotating electrical machine 1 in the embodiment. The different magnetic magnet 16d of the comparative example has an end face (front end face) 16C of the different magnetic magnet 16d on the front side of the front side and the rear side of the rotor 4A (that is, the rotation direction of the plurality of magnets 16) RD. A different magnetic part 19 is provided apart from the rear side in the rotation direction RD. Thereby, the front end surface 16C of the different magnetic magnet 16d of the comparative example is the same as the end surface (front end surface) 18B of the main magnetic part 18 on the front side in the rotation direction RD. The front end surface 19B of the different magnetic part 19 is spaced from the front end surface 18B of the main magnetic part 18 toward the rear side in the rotation direction RD, for example. The rear end surface 19A of the different magnetic part 19 is flush with the rear end surface 16E of the different magnetic magnet 16d.

In the case of the comparative example, the same magnetic pole is detected by the first Hall IC 38a in the different magnetic part 19 of the different magnetic magnet 16d and the magnet 16 adjacent to the different magnetic magnet 16d on the rear side in the rotation direction RD. As a result, in the comparative example, the absolute position detection timing PD is detected by switching the magnetic pole at the front side end surface 19B of the different magnetic section 19 on the front side in the rotation direction RD. As described above, when detecting the absolute position detection timing PD by the boundary of the different magnetic part 19, for example, the different magnetic part 19 of the different magnetic magnet 16d is partially connected to the already magnetized main magnetic part 18. If the different magnetic portion 19 is formed by being later magnetized, the positional accuracy of the magnetic characteristics of the different magnetic portion 19 may decrease, and the error dPD of the absolute position detection timing PD may increase.

On the other hand, in the embodiment, after detecting the detection preparation start timing PD0 by the boundary of the different magnetic part 19, the absolute position is detected by the boundary of other magnets 16 other than the different magnetic magnet 16c whose magnetic characteristics have higher position accuracy. Since the timing PD is detected, the absolute predetermined rotational position of the rotor 4 can be detected with higher accuracy.

As described above, according to the rotating electric machine 1 of the embodiment, the different magnetic part 19 of the different magnetic magnet 16c is the end face (rear side end face) of the different magnetic magnet 16c and the main magnetic part 18 on the rear side in the rotation direction RD. ) 16B and 18A on the front side in the rotational direction RD. The first Hall IC 38a that outputs the first signal P corresponding to each of the main magnetic part 18 and the different magnetic part 19 first outputs the first signal P corresponding to the stop of detection of the different magnetic part 19 after detecting the different magnetic part 19. 1 signal P is output. Next, the first Hall IC 38a outputs a first signal P corresponding to switching of magnetic poles between adjacent magnets 16 in the rotational direction RD after the detection of the different magnetic portion 19 is stopped.
As a result, compared to the first signal P corresponding to the different magnetic part 19, the first signal P corresponding to the switching of the magnetic poles between the magnets 16 having higher positional accuracy is associated with the different magnetic part 19. This can be obtained as information for grasping the absolute predetermined rotational position of the rotor 4, and the accuracy of detecting the position of the rotor 4 can be improved.

As described above, according to the rotating electric machine system 100 of the embodiment, after detection preparation start timing PD0 is detected by the boundary of the different magnetic part 19, other magnets other than the different magnetic magnet 16c whose magnetic characteristics have higher positional accuracy are detected. Since the absolute position detection timing PD is detected by the boundary of 16, the absolute predetermined rotational position of the rotor 4 can be detected with higher accuracy. Thereby, based on the absolute predetermined rotational position of the rotor 4 that is associated with a predetermined state of the crankshaft or a predetermined position (for example, top dead center, etc.) of a piston (not shown) connected to the crankshaft. , it is possible to accurately set the ignition timing and fuel injection timing of the internal combustion engine.

(Modified example)
Modifications of the embodiment will be described below.

<First modification example>
In the embodiment described above, the different magnetic portion 19 of the different magnetic magnet 16c is the end of the different magnetic magnet 16c on the front side in the rotation direction RD and the end of the different magnetic magnet 16c on the axially outer side in the rotation axis direction Z. However, it is not limited to this. The different magnetic part 19 may be arranged at a position away from both end surfaces (the rear end surface 16B and the front end surface 16F) of the different magnetic magnet 16c in the rotation direction RD. The different magnetic part 19 may be arranged at an appropriate position in the rotation axis direction Z. The appropriate position in the rotation axis direction Z is a position facing the first Hall IC 38a in the radial direction.

FIG. 9 is a diagram showing an example of a temporal change in a signal output from the first Hall IC 38a around the different magnetic magnet 16e during rotation of the rotor 4B of the rotating electrical machine 1B in the first modification of the embodiment.
As shown in FIG. 9, the difference between the rotating electrical machine 1B of the first modification and the rotating electrical machine 1 of the embodiment is the position of the different magnetic part 19 in one predetermined magnet 16. The rotating electric machine 1B in the first modification includes a rotor 4B having a different magnetic magnet 16e instead of the rotor 4 having the different magnetic magnet 16c of the rotating electric machine 1 in the embodiment.

The different magnetic magnets 16e of the first modification are provided away from the front end surface 16C and forward from the front end surface 16C in the rotational direction of the rotor 4B (that is, the rotational direction of the plurality of magnets 16) RD. A different magnetic part 19 is provided. As a result, the rear end surface 16B of the different magnetic magnet 16e and the rear end surface 18A of the main magnetic section 18 are the same, and the front end surface 16C of the different magnetic magnet 16e and the front end surface 18B of the main magnetic section 18 are the same. It is. The rear end surface 19A of the different magnetic part 19 is separated from the rear end surface 16B of the different magnetic magnet 16e and the rear end surface 18A of the main magnetic part 18 toward the front side in the rotation direction RD.

In the first modification, similarly to the embodiment, the control device 101 controls the magnetic poles between the circumferentially adjacent magnets 16 after detecting the detection preparation start timing PD0 caused by the different magnetic portion 19 of the different magnetic magnet 16e. Absolute position detection timing PD caused by switching is detected. As a result, even if, for example, the positional accuracy of the magnetic properties at the boundary of the different magnetic portion 19 is lower than the positional accuracy of the magnetic properties of the other magnets 16 other than the different magnetic magnet 16e, the absolute The predetermined rotational position can be determined with high precision.

<Second modification example>
In the embodiment described above, the first Hall IC 38a and the second Hall IC 38b are arranged along the rotational axis direction Z in the internal space of the first leg portion 61a, but the present invention is not limited thereto. For example, the first Hall IC 38a is disposed in the internal space of the fourth leg, which is different from the first to third legs 61a, 61b, and 61c, so that the first Hall IC 38a has a circumferential position relative to the second Hall IC 38b. They may be arranged shifted in the direction.

FIG. 10 is a developed view of the inner peripheral side of the rotor 4 in the second modification. FIG. 11 shows an example of temporal changes in signals output from the first to fourth Hall ICs 38a, 38b, 38c, and 38d during rotation of the rotor 4 in the 12-pole, 18-slot rotating electric machine 1C of the second modification. It is a diagram.
In the second modification, the first Hall IC 38a, the second Hall IC 38b, the third Hall IC 38c, and the fourth Hall IC 38d move from the rear side to the front side in the rotational direction RD of the rotor 4. , are arranged at intervals of 120 electrical degrees in the circumferential direction.

The first Hall IC 38a and the fourth Hall IC 38d are arranged at an interval of 360 electrical degrees, so that the first signal P output from the first Hall IC 38a and the first signal P output from the fourth Hall IC 38d The four signals W are the same for all of the magnets 16 except for the different magnetic part 19 of the different magnetic magnet 16c. When the first Hall IC 38a and the fourth Hall IC 38d are arranged at an interval of 360 electrical degrees, in the region where the first Hall IC 38a does not detect the different magnetic part 19, the first Hall IC 38a 1 signal P and the fourth signal W of the fourth Hall IC 38d match. On the other hand, in the region where the first Hall IC 38a detects the different magnetic part 19, the first signal P of the first Hall IC 38a and the fourth signal W of the fourth Hall IC 38d are different. Thereby, the timing at which the first Hall IC 38a faces the different magnetic part 19 can be detected.

Here, the control device 101 sets the timing at which detection of the different magnetic part 19 of the different magnetic part 19 of the different magnetic magnet 16c ends after the first Hall IC 38a starts detecting the different magnetic part 19 as the detection preparation start timing PD0. The detection preparation start timing PD0 is, for example, when the signal group S (P, U, V, W) changes from the fourth signal group S4 (P, U, V, W) = (1, 1, 1, 0) to the fifth signal group S (P, U, V, W). This is the timing at which the signal group S5 (P, U, V, W) = (0, 0, 1, 0) is switched.

Next, after detecting the detection preparation start timing PD0, the control device 101 sets the timing at which the switching of the magnetic poles between the circumferentially adjacent magnets 16 is detected by the first Hall IC 38a as the absolute position detection timing PD. . The absolute position detection timing PD is, for example, when the signal group S (P, U, V, W) is changed from the fifth signal group S5 (P, U, V, W) = (0, 0, 1, 0) to the sixth signal group S (P, U, V, W). This is the timing at which the signal group S6 (P, U, V, W) = (1, 0, 1, 1) is switched.
Then, the control device 101 sets the ignition timing and fuel injection timing of the internal combustion engine according to the absolute position detection timing PD when starting the internal combustion engine.

In the second modification, as in the embodiment, after detecting the detection preparation start timing PD0 caused by the different magnetic portions 19 of the different magnetic magnets 16c, the control device 101 controls the magnetic poles between the circumferentially adjacent magnets 16. Absolute position detection timing PD caused by switching is detected. As a result, even if, for example, the positional accuracy of the magnetic properties at the boundary of the different magnetic portion 19 is lower than the positional accuracy of the magnetic properties of the other magnets 16 other than the different magnetic magnet 16e, the absolute The predetermined rotational position can be determined with high precision.

<Third modification example>
In the embodiment described above, the rotating electric machine 1 has 12 poles and 18 slots, but the invention is not limited to this. For example, the rotating electric machine 1 may have other numbers of poles and slots, such as 14 poles and 12 slots.
FIG. 12 is a developed view of the inner peripheral side of the rotor 4D in the third modification. FIG. 13 is a diagram showing an example of temporal changes in signals output from the first to fourth Hall ICs 38a, 38b, 38c, and 38d during rotation of the rotor 4D in the 14-pole rotating electrical machine 1D of the third modification. be.

In the third modification, the control device 101 first starts detection preparation at the timing when the detection of the different magnetic part 19 ends after the first Hall IC 38a starts detecting the different magnetic part 19 of the different magnetic magnet 16c. The timing is set to PD0. The detection preparation start timing PD0 is, for example, when the signal group S (P, U, V, W) changes from the seventh signal group S7 (P, U, V, W) = (1, 1, 1, 0) to the eighth signal group S (P, U, V, W). This is the timing at which the signal group S8 (P, U, V, W) = (0, 1, 0, 0) is switched.

Next, after detecting the detection preparation start timing PD0, the control device 101 sets the timing at which the switching of the magnetic poles between the circumferentially adjacent magnets 16 is detected by the first Hall IC 38a as the absolute position detection timing PD. . The absolute position detection timing PD is, for example, when the signal group S (P, U, V, W) is changed from the eighth signal group S8 (P, U, V, W) = (0, 1, 0, 0) to the ninth signal group This is the timing at which the signal group S9 (P, U, V, W) = (1, 0, 0, 1) is switched.
Then, the control device 101 sets the ignition timing and fuel injection timing of the internal combustion engine according to the absolute position detection timing PD when starting the internal combustion engine.

In the third modification, similarly to the embodiment, after detecting the detection preparation start timing PD0 caused by the different magnetic portions 19 of the different magnetic magnets 16c, the control device 101 controls the magnetic poles between the circumferentially adjacent magnets 16. Absolute position detection timing PD caused by switching is detected. As a result, even if, for example, the positional accuracy of the magnetic properties at the boundary of the different magnetic portion 19 is lower than the positional accuracy of the magnetic properties of the other magnets 16 other than the different magnetic magnet 16e, the absolute The predetermined rotational position can be determined with high precision.

<Other variations>
In the embodiment described above, the second Hall IC 38b, the third Hall IC 38c, and the fourth Hall IC 38d are arranged at intervals of 120 degrees in electrical angle in the circumferential direction, but the present invention is not limited to this. Not done. For example, they may be arranged at intervals of 60 electrical degrees in the circumferential direction. In this case, the control device 101 may generate the third signal V and the fourth signal W by, for example, inverting the signals output from the third Hall IC 38c and the fourth Hall IC 38d.

In the embodiment described above, the second to fourth Hall ICs 38b, 38c, and 38d are arranged at the second position M2 in the rotation axis direction Z, but the present invention is not limited to this, and they may be arranged at different positions in the rotation axis direction Z. may be placed in
In the embodiment described above, the Hall ICs 38a, 38b, 38c, and 38d are provided, but the present invention is not limited to this, and other magnetic sensors may be provided.

The embodiments of the invention are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.
For example, in the above-described embodiment, the rotating electrical machine 1 is a starter generator for an internal combustion engine for a vehicle such as a motorcycle, but the present invention is not limited thereto and may be applied to various uses. For example, the rotating electrical machine 1 may simply be a generator or may simply be an electric motor.

1, 1A, 1B, 1C, 1D... Rotating electric machine, 2... Stator, 4, 4A, 4B, 4D... Rotor, 6... Position detection sensor unit, 16... Magnet, 16a... N pole magnet, 16b... S pole magnet, 16c, 16d, 16e... Different magnetic magnet, 18... Main magnetic part, 18A... Rear side end surface, 19... Different magnetic part, 38a... First Hall IC (magnetic sensor, first magnetic sensor), 38b... Second Hall IC (magnetic sensor, second magnetic sensor), 38c... third Hall IC (magnetic sensor, second magnetic sensor), 38d... fourth Hall IC (magnetic sensor, second magnetic sensor), 100... Rotating electric machine system, 101... Control device

Claims (3)

rotating electric machine,
a control device;
Equipped with
The rotating electrical machine is
a rotor having a plurality of magnets with different magnetic poles arranged alternately along the rotational direction;
a stator that generates a magnetic field that rotates the rotor;
a plurality of magnetic sensors arranged at positions facing the plurality of magnets and outputting signals according to the magnetic poles of each of the plurality of magnets;
Equipped with
The plurality of magnets have a main magnetic part, which is a main body, and magnetic properties different from those of the main magnetic part, and extend from an end face of the main magnetic part on the rear side in the rotational direction to the front side in the rotational direction. Equipped with a different magnetic magnet having different magnetic parts arranged at shifted positions,
The plurality of magnetic sensors are
a first magnetic sensor that is disposed at a position facing the rotation orbit of the different magnetic part of the different magnetic magnet and outputs a signal according to the magnetic property of the main magnetic part and a signal depending on the magnetic property of the different magnetic part; and,
The magnetic property of the main magnetic part is arranged at a position facing the rotational orbit of the main magnetic part and not facing the rotational orbit of the different magnetic part, and does not output a signal corresponding to the magnetic property of the different magnetic part. at least one second magnetic sensor that outputs a signal according to the
Equipped with
The control device includes:
After the first magnetic sensor starts outputting a signal according to the magnetic property of the different magnetic part, the timing at which the first magnetic sensor ends outputting a signal according to the magnetic property of the different magnetic part. is the detection preparation start timing,
After the detection preparation start timing is detected, the timing at which the first magnetic sensor outputs a signal corresponding to switching of the magnetic poles between the magnets adjacent in the rotation direction is defined as an absolute position detection timing,
obtaining an absolute predetermined rotational position of the rotor according to the absolute position detection timing;
A rotating electric machine system characterized by: The rotating electric machine system according to claim 1, wherein the direction of the magnetic pole of the main magnetic part and the direction of the magnetic pole of the different magnetic part are opposite to each other. The rotating electric machine system according to claim 1, wherein the material of the main magnetic part and the material of the different magnetic part are different.

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