JP2002078307A - Permanent magnet type rotary electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type rotary electric motor that works as a starter-cum-generator, capable of obtaining large driving torque when functioning as a starter motor and of suppressing driven torque, when it functions as a generator. SOLUTION: This permanent magnet type rotary electric motor is provided with a rotor yoke of substantially a cylindrical shape that revolves around the outside circumference of a stator, having a plurality of magnet inserting holes arranged along its circumferential direction yoke that sandwiches interpole parts, and with a permanent magnet that is inserted in each magnet-inserting hole. In this rotary electric motor, each magnet inserting hole 611 has a main opening part, into which a permanent magnet 62 is inserted and slits 614 a prescribed width (W), that extend from both ends along the circumferential direction of the main opening part to the central part. A remaining thickness (H) and the slit width (W) of the rotor yoke at the end of the slit 614 are determined to satisfy the relation 0.3<=remaining thickness (H) slit width (W)<=0.7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotary motor in which a rotor yoke in which a plurality of permanent magnets are arranged in a circumferential direction rotates around the outer periphery of a stator, and the rotor yoke has an auxiliary pole between the permanent magnets. In particular, the present invention relates to a permanent magnet type rotary electric motor suitable as a starter / generator for an internal combustion engine.

[0002]

2. Description of the Related Art Hitherto, a starter motor and a generator for an internal combustion engine have been separately provided, but a starter / generator device in which the respective functions are integrated is disclosed in, for example, JP-A-10-148142. ing.

On the other hand, as a starter motor for an internal combustion engine, there has been known an abduction type permanent magnet type rotary motor in which a cylindrical rotor yoke rotates around the outer periphery of a stator. Also,
In such a permanent magnet type rotary motor, a permanent magnet type in which an auxiliary pole portion is formed between adjacent permanent magnets in order to alleviate the distortion of the magnetic flux distribution between the rotor and the stator to prevent the occurrence of torque vibration. A rotary electric motor is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-275476.

[0004]

In the above-mentioned conventional permanent magnet type rotary electric motor, a leakage magnetic flux having the auxiliary pole as a magnetic path is generated between the permanent magnets adjacent to each other with the auxiliary pole therebetween, so that the effective magnetic flux is reduced. Would. Therefore, in order to obtain more drive torque, it is necessary to increase the size of the permanent magnet or increase the exciting current of the stator winding, but this causes an increase in the size and weight of the motor and an increase in power consumption. I will.

Further, when one motor is to function as a starter motor when the internal combustion engine is started and as a generator when the vehicle is running, when the size of the permanent magnet is increased as described above, the motor functions as a starter motor. On the other hand, a large driving torque can be obtained, but when it functions as a generator, unnecessarily large electric power is generated. Therefore, the torque required for the internal combustion engine E to drive the starter / generator device (the driven torque) ) Becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems of the prior art, and to provide a large drive torque when functioning as a starter motor and a small driven torque when functioning as a generator. An object of the present invention is to provide a permanent magnet type rotary electric motor as a device.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a substantially cylindrical rotor yoke rotating on the outer periphery of a stator is provided with a plurality of magnet insertion holes extending in the circumferential direction thereof. In the permanent magnet type rotary motor in which a permanent magnet is inserted into each magnet insertion hole, the magnet insertion hole has a main opening portion into which the permanent magnet is inserted, and a circumference of the main opening portion. A slit extending at a predetermined width (W) from both ends along the direction toward the center, and the remaining thickness (H) of the rotor yoke at the tip of the slit and the slit width (W) are zero. 0.3 ≦ residual thickness (H) / slit width (W) ≦ 0.7.

If the slit width (W) is increased, the remaining thickness (H)
Becomes thinner, which is disadvantageous from the viewpoint of reducing the driven torque. Conversely, if the residual thickness (H) is increased, it is disadvantageous from the viewpoint of increasing the driving torque. Therefore, it is necessary to increase the driving torque by increasing the slit width W and increase the driven thickness by increasing the residual thickness H of the rotor yoke. Decreasing the torque is a trade-off event, and the ratio (H
/ W) must be set low if priority is given to increasing drive torque, and high if priority is given to reduction of driven torque. However, if 0.3 ≦ residual thickness (H) / slit width (W) ≦ 0.7, both drive torque and driven torque can be effectively compatible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall side view of a scooter type motorcycle in which a permanent magnet type rotary electric motor according to the present invention is applied to a starter / generator device.

The vehicle body front part 3a and the vehicle body rear part 3b are connected via a low floor part 4, and the vehicle body frame forming the framework of the vehicle body is generally composed of a down tube 6 and a main pipe 7. A fuel tank and a storage box (both not shown) are supported by a main pipe 7, and a seat 8 is disposed above the main tank 7.

In the front part 3a of the vehicle body, the steering head 5
A handle 11 is provided above, and a front fork 12 extends downward, and a front wheel FW is supported at the lower end thereof. The upper part of the handle 11 is covered with a handle cover 13 also serving as an instrument panel. A bracket 15 projects from the lower end of the rising portion of the main pipe 7, and a hanger bracket 18 of the swing unit 2 is swingably connected to and supported by the bracket 15 via a link member 16.

The swing unit 2 has a single-cylinder two-stroke internal combustion engine E mounted at the front thereof. A belt-type continuously variable transmission 26 is formed from the internal combustion engine E to the rear, and a rear wheel RW is pivotally supported by a reduction mechanism 27 provided at a rear portion thereof via a centrifugal clutch. A rear cushion 22 is interposed between the upper end of the speed reduction mechanism 27 and the upper bent portion of the main pipe 7. A carburetor 24 connected to an intake pipe 23 extending from the internal combustion engine E and an air cleaner 25 connected to the carburetor 24 are provided at a front portion of the swing unit 2.

FIG. 2 is a sectional view of the swing unit 2 taken along the crankshaft 201, and the same reference numerals as those described above denote the same or equivalent parts.

The swing unit 2 is covered by a crankcase 202 formed by combining left and right crankcases 202L and 202R, and the crankshaft 201 is rotatably supported by bearings 208 and 209 fixed to the crankcase 202R. Have been. On the crankshaft 201,
A connecting rod (not shown) is connected via a crank pin 213.

The left crankcase 202L also serves as a belt-type continuously variable transmission chamber case.
Belt drive pulley 2
10 is provided rotatably. Belt drive pulley 2
10 includes a fixed pulley half 210L and a movable pulley half 210R, and the fixed pulley half 210L is fixed to the left end of the crankshaft 201 via a boss 211,
On the right side, the movable pulley half 210R is connected to the crankshaft 20.
1 and can approach / separate from the fixed-side pulley half 210L. Both pulley halves 210L,
A V-belt 212 is wound around 210R.

A cam plate 215 is fixed to the crankshaft 201 on the right side of the movable pulley half 210R.
A slide piece 215a provided on the outer peripheral end is slidably engaged with a cam plate sliding boss 210Ra formed in the axial direction at the outer peripheral end of the movable pulley half 210R. Cam plate 215 of movable pulley half 210R
Has a tapered surface inclined toward the cam plate 215 toward the outer periphery, and the tapered surface and the movable pulley half 210R
A dry weight pole 216 is accommodated in a space between the two.

When the rotation speed of the crankshaft 201 increases, the dry weight ball 216 which rotates between the movable pulley half 210R and the cam plate 215 rotates together.
However, the movable pulley half 210R is pressed by the dry weight ball 216 and moves leftward to approach the fixed pulley half 210L due to the centrifugal force. As a result, the V-belt 212 sandwiched between the two pulley halves 210L and 210R moves in the centrifugal direction, and its winding diameter increases.

The belt drive pulley 21 is provided at the rear of the vehicle.
A driven pulley (not shown) corresponding to 0 is provided, and the V-belt 212 is wound around the driven pulley. By this belt transmission mechanism, the power of the internal combustion engine E is automatically adjusted and transmitted to the centrifugal clutch, and drives the rear wheel RW via the speed reduction mechanism 27 and the like.

A starter / generator device 1 combining a starter motor and an AC generator is provided in the right crankcase 202R. In the starter / generator device 1, the outer rotor 60 is fixed to a tapered end of the crankshaft 201 by a screw 253. The inner stator 50 disposed inside the outer rotor 60 is
9 and screwed and supported. The configuration of the starter / generator device 1 will be described later in detail with reference to FIGS.

The fan 280 has a central conical portion 280a.
Is fixed to the outer rotor 60 by bolts 246, and the fan 280 is covered by a fan cover 281 via a radiator 282.

A sprocket 231 is fixed on the crankshaft 201 between the starter / generator device 1 and the bearing 209, and the sprocket 231 drives a camshaft (not shown) from the crankshaft 201. Chains are wound around. The sprocket 231 is formed integrally with a gear 232 for transmitting power to a pump for circulating lubricating oil.

FIGS. 3 and 4 are a partially broken plan view and a side sectional view of the starter / generator device 1 (permanent magnet type rotary electric motor) taken along a plane perpendicular to the rotation axis (crankshaft 201). 6 is a plan view of the rotor yoke and a partially enlarged view thereof, and the same reference numerals as those described above denote the same or equivalent parts.

As shown in FIGS. 3 and 4, the starter / generator device 1 of this embodiment comprises a stator 50 and an outer rotor 60 rotating around the outer periphery of the stator 50. As shown in FIGS. 4 and 5, the rotor yoke 61 is formed by laminating ring-shaped silicon steel plates (thin plates) in a substantially cylindrical shape, and in the circumferential direction of the rotor yoke 61 as shown in FIGS. The N-pole permanent magnet 62N and the S-pole permanent magnet 62S alternately inserted into the plurality of openings 611 provided, and the rotor yoke 61 is connected to the crankshaft 20 as shown in FIGS.
1 and a cup-shaped rotor case 63 connected to the rotor case 1.

The rotor case 63 has a claw portion 63a at a circumferential end thereof, and the rotor yoke 61 having the laminated structure is axially clamped by bending the claw portion 63a inward. Opening 61
Each of the permanent magnets 62 (62N, 62S) inserted into the rotor 1 is held at a predetermined position in the rotor yoke 61.

The stator 50 is made of a silicon steel plate (thin plate)
And includes a stator core 51 and stator salient poles 52 as shown in FIG. A stator winding 53 is wound around each of the stator salient poles 52 in a single-pole concentrated manner.
The main surface of the stator 50 is covered with a protective cover 71.

As shown in FIGS. 5 and 6, the rotor yoke 61 has twelve openings 611 into which the permanent magnets 62 are inserted in the axial direction at intervals of 30 degrees in the circumferential direction. At both ends along the circumferential direction of each opening 611,
A slit 614 extending at a predetermined width toward the center is formed. Between the adjacent openings 611, the auxiliary pole 6
Function as 13.

As shown in FIG. 7, a permanent magnet 62 having a substantially drum-shaped cross section is inserted into each of the openings 611. Here, in the present embodiment, the shape of the opening 611 and the cross-sectional shape of the permanent magnet 62 are not the same, and when the permanent magnet 62 is inserted into the opening 611, the circumferential direction of each permanent magnet 62 is A gap 612 is formed on both sides along the line, and the slit 614 remains on both ends of each permanent magnet 62 on the stator side.

FIG. 8 is a block diagram of a control system of the starter / generator device 1, and the same reference numerals as those described above denote the same or equivalent parts.

The control unit 40 converts the output voltage VBATT of the battery 42 into a logic voltage VDD and
DC-DC converter 102 to be supplied to the IG coil 41
Control device 103 for controlling power supply to the ignition plug 43 to ignite the ignition plug 43 at a predetermined timing;
Three-phase driver 1 that converts TT into three-phase AC power and supplies it to stator winding 53 of starter / generator device 1
04.

The throttle sensor 45 detects the throttle opening θth and notifies the CPU 101 of the detected throttle opening θth. The rotor sensor 46 detects the rotation position of the outer rotor 60 and notifies the CPU 101 of the rotation position. The regulator 44 controls the induced electromotive force generated in the stator winding 53 according to the rotation of the outer rotor 60 to a predetermined battery voltage VBATT.

In such a configuration, when the engine is started, the CPU 101 determines the excitation timing of the stator winding 53 based on the rotational position of the outer rotor 60 detected by the rotor sensor 46, and determines the power of the three-phase driver 104. AC power is supplied to each phase of the stator winding 53 by controlling the switching timing of the FET.

Each power FET (T
r1 to Tr6) are PWM controlled by the CPU 101,
The duty ratio, that is, the driving torque is controlled based on the rotation speed of the outer rotor 60.

On the other hand, when the internal combustion engine E is started, the power supply from the three-phase driver 104 to the stator winding 53 is stopped, and this time the starter / generator 1
Driven in accordance with At this time, the stator winding 5
3, an electromotive force is generated according to the rotation speed of the crankshaft 201. The electromotive force is controlled by the regulator 44 to the battery voltage VBATT, and is supplied to the electric load and the surplus power is charged to the battery 42.

Next, the action of the slit 614 provided in the rotor yoke 61 and the gap 612 formed between the rotor yoke 61 and the permanent magnet 62 will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 9 is a diagram showing a magnetic flux density distribution when the starter / generator device 1 functions as a starter motor, and FIG. 10 is a magnetic flux density distribution when the device 1 functions as a generator. FIG.

When the starter / generator device 1 functions as a starter motor, the control unit 40
When an exciting current is supplied from the battery 42 to each of the stator windings 53 through the, the magnetic field lines generated in the radial direction from the stator salient poles 52N excited to the N pole form the S pole permanent magnets 62S as shown in FIG. Pull out from the stator side surface to the back side,
Most of them pass through the core portion 615 and the auxiliary pole portion 613 of the rotor yoke 61 and return to the stator salient pole 52S excited to the adjacent S pole and the stator salient pole 52N excited to the N pole via the stator core 51. .

At this time, in the present embodiment, each permanent magnet 62
Air gaps 612 are formed on both sides along the circumferential direction of the magnet, and the magnetic flux leaking from the side of each permanent magnet 62 to the auxiliary pole 613 is reduced. And reaches the stator 50 via the auxiliary pole part 613. As a result, the vertical component of the magnetic flux passing through the air gap between the outer rotor 60 and the stator 50 increases, so that the driving torque can be increased as compared with the case where the air gap 612 is not provided.

Further, in this embodiment, since the slits 614 for limiting the magnetic path in the circumferential direction are also formed on the stator side at both ends of the permanent magnet 62, the leakage magnetic flux passing through the inside of the rotor yoke 61 is formed. Also decreases.

That is, as shown in FIG. 21 by enlarging the inside of the broken line circle in FIG. 9, one of the slits 614 (614A)
Is the magnetic flux B passing through the auxiliary pole portion 613 of the rotor yoke 61.
1 prevents the magnetic flux B1 from being guided to the inner circumferential portion 616 of the rotor yoke 61, and acts to efficiently guide most of the magnetic flux B1 to the stator salient pole 52S. The other (614B) of the slit 614 is connected to the rotor yoke 61 from the permanent magnet 62N.
The magnetic flux B2 passing through the inner circumferential portion 616 of the
Of the magnetic flux B2 to the stator salient pole 5
It works to efficiently guide to 2S. As a result, the vertical component of the magnetic flux passing through the air gap between the outer rotor 60 and the stator 50 further increases, and the driving torque as a starter motor can be further increased.

On the other hand, the starter / generator device 1
As shown in FIG. 10, the magnetic flux generated from each of the permanent magnets 62 forms a closed magnetic circuit together with the stator salient poles and the stator core, so that the generated current corresponding to the rotation speed of the rotor is Can be generated on the line.

In this embodiment, the regulator 4
4 is set to 14.5V, and when the output voltage when the starter / generator device 1 functions as a generator reaches the regulated voltage, the ground-side power FET T among the power FETs
r2, Tr4, Tr6 are short-circuited. As a result, a short-circuit current flows through each stator winding 53 in a delayed phase, and the lines of magnetic force passing through the stator 50 decrease,
Since the leakage magnetic flux connecting the adjacent permanent magnets 62 increases, the driven torque of the starter / generator device 1 decreases, and the load on the internal combustion engine E decreases.

That is, as shown in FIG. 21 by enlarging the inside of the broken line circle in FIG. 10, the adjacent permanent magnets 62S, 62N
The magnetic flux B3 passing through the outer circumferential portion 617 of the rotor yoke 61, the magnetic flux B4 passing through the auxiliary pole portion 613 of the rotor yoke 61, and the inner circumferential portion 616 of the rotor yoke 61
, And a magnetic flux B6 passing through the inner circumferential portion 616 of the rotor yoke 61, the air gap, and the stator salient pole 52N.

As described above, according to this embodiment, the rotor yoke 61 of the outer rotor 60 is
In the permanent magnet type rotary electric motor having the auxiliary pole portion 613 between the permanent magnets 62 and the rotor yoke 61, the gap 6
The provision of the slit 12 and the slit 614 reduces the leakage magnetic flux between the adjacent permanent magnets and increases the magnetic flux perpendicularly intersecting the air gap between the outer rotor 60 and the stator 50. Therefore, the drive torque when functioning as a starter motor can be increased without increasing the driven torque when causing the permanent magnet type rotary electric motor to function as a generator.

As is clear from the above description, when the permanent magnet type rotary motor is caused to function as a starter motor, as shown in FIG.
Since the driving torque is increased by interfering the magnetic fluxes B1 and B2 with A and 614B, it is preferable that the width W of each slit 614 is wider as shown on the right side of FIG.

On the other hand, when the permanent magnet type rotary motor functions as a generator, as shown in FIG. 22, the driven torque is reduced by securing a sufficient magnetic path for the leakage magnetic flux B5. As shown enlarged in
It is preferable that the remaining thickness H of the rotor yoke at the tip of each slit 614 is larger.

Here, if the slit width W is increased, FIG.
, The leakage magnetic flux B5 is reduced, which is equivalent to reducing the residual thickness H, which is disadvantageous from the viewpoint of reducing the driven torque. Conversely, if the residual thickness H at the tip of the slit is increased, the effective components of the magnetic fluxes B1 and B2 in FIG. 21 (the amount guided to the stator side) are reduced, which is equivalent to a reduction in the slit width W. Is disadvantageous from the viewpoint of increasing Therefore, increasing the driving torque by increasing the slit width W and decreasing the driven torque by increasing the residual thickness H at the tip of the slit are two trade-offs, and the ratio (H / W) of the two is equal to the driving torque. Must be set low if priority is given to increasing torque, and high if priority is given to reduction of driven torque.

FIGS. 23 and 24 show the ratio (H /
W), drive torque (FIG. 23) and driven torque (FIG. 2).
FIG. 6 is a diagram showing the relationship with 4) as a parameter, with the remaining thickness H of the rotor yoke at the tip of the slit 614 as a parameter. Note that the driven torque in FIG. 24 indicates that the absolute value increases as the driven torque increases.

The driving torque is, as shown in FIG.
(H / W) tends to increase with decrease, but (H / W)
When W) is less than about 0.3, the rate of increase slows down. On the other hand, the driven torque is (H / W) as shown in FIG.
Shows a tendency to increase with the decrease of (H / W), and (H / W) is about 0.
If it is less than 3, the rate of increase will increase. Accordingly, the ratio (H / W) between the slit width W and the residual thickness H is 0.3.
It can be seen that it is desirable to make settings as described above.

As shown in FIG. 24, the decreasing rate of the driven torque tends to become slower when (H / W) exceeds about 0.5, and the decreasing rate of the driving torque becomes (H / W). W) tends to become dull in the range of 0.5 to 0.7. Therefore,
The (H / W) is preferably set to 0.7 or less,
It can be said that around 0.5 is optimal.

From the above experimental results, according to the present embodiment, by setting (H / W) in the range of 0.3 to 0.7, it is possible to effectively balance both the driving torque and the driven torque. By setting (H / W) at or near 0.5, both the driving torque and the driven torque can be achieved most effectively.

FIG. 11 is a view showing a planar shape of a rotor yoke 61a according to a second embodiment of the present invention. FIG. 12 is a view showing a permanent magnet 62 in an opening 611a of the rotor yoke 61a.
It is a partial enlarged view in the state where a was inserted, and the same numerals as the above represent the same or equivalent parts.

In this embodiment, the opening 611a of the rotor yoke 61a has a substantially trapezoidal shape, and a permanent magnet 62a having a rectangular cross section is inserted into the opening 611a.
As a result, on both sides along the circumferential direction of the permanent magnets 62a, air gaps 612a are formed to prevent magnetic flux leakage between the adjacent permanent magnets 62a. Also, since the slit 614a for limiting the magnetic path in the circumferential direction is formed, the same effect as described above is achieved.

FIG. 13 is a diagram showing a plan view of a rotor yoke 61b according to a third embodiment of the present invention, and FIG. 14 is a view showing a permanent magnet 62 in an opening 611b of the rotor yoke 61b.
It is a partial enlarged view in the state where b was inserted, and the same code as the above represents the same or equivalent part.

In this embodiment, the opening 611b of the rotor yoke 61b is shaped like a drum, and the opening 611b is
A permanent magnet 62b having a drum-shaped cross section is inserted through b. As a result, air gaps 612b for preventing magnetic flux leakage between adjacent permanent magnets 62b are formed on both sides along the circumferential direction of the permanent magnets 62b.
Since the slits 614b for limiting the magnetic path in the circumferential direction are also formed on the stator side at both end portions, the same effect as described above is achieved.

FIG. 15 is a diagram showing a plan view of a rotor yoke 61c according to a fourth embodiment of the present invention, and FIG. 16 is a view showing a permanent magnet 62 in an opening 611c of the rotor yoke 61c.
FIG. 4 is a partially enlarged view in a state where c is inserted, and the same reference numerals as those described above denote the same or equivalent parts.

In this embodiment, the opening 611c of the rotor yoke 61c has a different shape with notches provided on both sides of the drum-shaped portion, and the permanent magnet 62 having a drum-shaped cross section is formed in the opening 611c.
c is inserted. As a result, air gaps 612c for preventing leakage magnetic flux between adjacent permanent magnets 62c are formed on both sides along the circumferential direction of the permanent magnets 62c,
Since the slits 614c for limiting the magnetic path in the circumferential direction are also formed on the stator side at both ends of each permanent magnet 62c, the same effect as described above is achieved.

FIG. 17 is a plan view showing a rotor yoke 61d according to a fifth embodiment of the present invention, and FIG. 18 is a view showing a permanent magnet 62 in an opening 611d of the rotor yoke 61d.
FIG. 5 is a partially enlarged view in a state where d is inserted, and the same reference numerals as those described above denote the same or equivalent parts.

In this embodiment, the opening 611d of the rotor yoke 61d is shaped like a drum, and the opening 611d is
A permanent magnet 62d having a drum-shaped cross section is inserted through d. As a result, air gaps 612d for preventing magnetic flux leakage between adjacent permanent magnets 62d are formed on both sides of the permanent magnet 62d along the circumferential direction.

Further, apart from the opening 611d, a rotor yoke 61d corresponding to both ends of each permanent magnet 62d is provided.
Since the slit 614d for limiting the magnetic path in the circumferential direction is formed in the notch shape in the inner peripheral portion of the, the same effect as described above is achieved.

FIG. 19 is a view showing a planar shape of a rotor yoke 61e according to a sixth embodiment of the present invention. FIG. 20 is a view showing a permanent magnet 62 in an opening 611e of the rotor yoke 61e.
3 is a partially enlarged view in a state where e is inserted, and the same reference numerals as those described above represent the same or equivalent parts.

In this embodiment, the opening 611e of the rotor yoke 61e is shaped like a drum.
A permanent magnet 62e having a drum-shaped cross section is inserted through e. As a result, air gaps 612e for preventing leakage magnetic flux between adjacent permanent magnets 62e are formed on both sides along the circumferential direction of the permanent magnets 62e.
Since slits 614e for limiting the magnetic path in the circumferential direction are also formed on the stator side at both end portions, the same effect as described above is achieved.

[0062]

As described above, according to the present invention, in a permanent magnet type rotary motor in which the rotor yoke of the outer rotor has an auxiliary pole portion between the permanent magnets, both the driving torque and the driven torque are effectively compatible. Can be done.
Therefore, the drive torque when functioning as a starter motor can be increased without increasing the driven torque when causing the permanent magnet type rotary electric motor to function as a generator.

[Brief description of the drawings]

FIG. 1 is an overall side view of a scooter type motorcycle in which a permanent magnet type rotary electric motor according to the present invention is applied to a starter / generator device.

FIG. 2 is a sectional view taken along a crankshaft of the swing unit of FIG. 1;

FIG. 3 is a partially broken plan view of a starter / generator device (permanent magnet type rotary electric motor) in a plane perpendicular to a rotation axis (crankshaft).

FIG. 4 is a side sectional view of FIG. 3;

FIG. 5 is a plan view of a rotor yoke.

FIG. 6 is a side view of the rotor yoke.

FIG. 7 is a partially enlarged view of a rotor yoke.

FIG. 8 is a block diagram of a control system of the starter / generator device.

FIG. 9 is a view for explaining functions (at the time of electric power) of slits and gaps provided in the rotor yoke.

FIG. 10 is a diagram for explaining functions (at the time of power generation) of slits and gaps provided in a rotor yoke.

FIG. 11 is a diagram showing a planar shape of a rotor yoke according to a second embodiment of the present invention.

FIG. 12 is a partially enlarged view showing a state where a permanent magnet is inserted into the opening of FIG. 11;

FIG. 13 is a view showing a planar shape of a rotor yoke according to a third embodiment of the present invention.

FIG. 14 is a partially enlarged view of a state where a permanent magnet is inserted into the opening of FIG. 13;

FIG. 15 is a diagram showing a planar shape of a rotor yoke according to a fourth embodiment of the present invention.

FIG. 16 is a partially enlarged view showing a state where a permanent magnet is inserted into the opening of FIG. 15;

FIG. 17 is a view showing a planar shape of a rotor yoke according to a fifth embodiment of the present invention.

FIG. 18 is a partially enlarged view showing a state where a permanent magnet is inserted into the opening of FIG. 17;

FIG. 19 is a diagram showing a planar shape of a rotor yoke according to a sixth embodiment of the present invention.

20 is a partially enlarged view of a state where a permanent magnet is inserted into the opening of FIG. 19;

FIG. 21 is a partially enlarged view of FIG. 9;

FIG. 22 is a partially enlarged view of FIG. 10;

FIG. 23 is a diagram showing the relationship between the ratio (H / W) of the remaining thickness H of the rotor yoke and the slit width W at the tip of the slit (H / W) and the driving torque.

FIG. 24 is a diagram showing a relationship between a ratio (H / W) of a residual thickness H of the rotor yoke and a slit width W (H / W) at a tip end of a slit and a driven torque.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Starter and generator device, 50 ... Stator, 5
DESCRIPTION OF SYMBOLS 1 ... Stator core, 52 ... Stator salient pole, 53 ... Stator winding, 60 ... Outer rotor, 61 ... Rotor yoke,
62 (62N, 62S) permanent magnets, 63 ... rotor case, 71 ... protective cover, 201 ... crankshaft, 611 ...
Opening, 612 ... void, 613 ... supplementary electrode, 614 ... slit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 1/27 502 H02K 1/27 502C H02P 9/04 H02P 9/04 J F term (reference) 5H002 AA02 AB04 AB07 AE08 5H590 AA30 CA07 CC02 CD01 CD03 CE05 EA10 EA20 JA02 5H621 BB07 BB10 GA01 GA04 HH01 JK13 5H622 CA02 CA07 CA10 CA11 CB03 PP05 PP11

Claims (3)

[Claims] A substantially cylindrical rotor yoke that rotates on the outer periphery of a stator has a plurality of magnet insertion holes arranged along a circumferential direction thereof with an auxiliary pole interposed therebetween, and a permanent magnet is inserted into each magnet insertion hole. In the permanent magnet type rotary electric motor, the magnet insertion hole has a main opening into which the permanent magnet is inserted, and a predetermined width from both ends along the circumferential direction of the main opening toward the center. (W), and the remaining thickness (H) of the rotor yoke at the tip of the slit and the slit width (W) are 0.3 ≦ residual thickness (H) / slit width (W) ≦ A permanent magnet type rotary electric motor characterized by satisfying a relationship of 0.7. 2. The permanent magnet type rotary electric motor according to claim 1, wherein said residual thickness (H) / slit width (W) is approximately 0.5. 3. The permanent magnet rotary motor according to claim 1, wherein the permanent magnet type rotary electric motor functions as a motor when the rotational speed is lower than a predetermined rotational speed, and functions as a generator when the rotational speed is equal to or higher than the predetermined rotational speed. Magnet type rotary electric motor.