KR100409257B1 - Permanent magnet type rotary motor and its actuating system - Google Patents

Abstract

When operating as a starter motor, a large drive torque is obtained, and when functioning as a generator, a permanent magnet rotary motor as a starter and generator device in which driven torque is reduced is provided. In addition, the permanent magnet rotary motor with optimized ratio [Wmg: Wsp] of the width (Wmg) and the pole (Wsp) of the permanent magnet, and the relationship between the width of the pole (Wsp) and the advancing degree of energization are optimized. A drive device for a permanent magnet rotary motor is provided.

An approximately cylindrical rotor yoke rotating the outer periphery of the stator is arranged along the circumferential direction with a plurality of magnet insertion holes interposed therebetween, with permanent magnets inserted into each magnet insertion hole. 611 includes a main opening part into which the permanent magnet 62 is inserted, and a second gap 614 extending in a predetermined width W from both ends to the center portion in the circumferential direction of the main opening part. And the remaining thickness H and the slit width W of the rotor yoke at the tip of the second void 614 satisfy a relationship of 0.3 ≦ residual thickness H / slit width W ≦ 0.7. The ratio [Wmg: Wsp] of the width Wmg of the permanent magnet with respect to the rotational direction [Wmg: Wsp] is approximately [5: 1], and the phase of the alternating current supplied to each phase is determined by Advance by an angle corresponding to 1 to 1.5 times the width Wsp.

Description

Permanent magnet type rotary motor and its actuating device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet rotary motor and its driving apparatus in which a rotor yoke, in which a plurality of permanent magnets are arranged in a circumferential direction, rotates the outer periphery of the stator, and in particular, the rotor yoke has a pole portion between each permanent magnet. And a driving device thereof.

Conventionally, although the starter motor and generator for an internal combustion engine were equipped separately, the starter and generator apparatus which integrated each function is disclosed by Unexamined-Japanese-Patent No. 10-148142, for example.

On the other hand, as a starter motor for an internal combustion engine, an outer permanent permanent magnet rotary motor in which a cylindrical rotor yoke rotates the outer circumference of a stator is known. Moreover, in such a permanent magnet rotary motor, a permanent magnet rotary motor having a pole portion formed between adjacent permanent magnets in order to alleviate distortion of the magnetic flux distribution between the rotor and the stator to prevent torque vibration, for example. For example, it is disclosed in Unexamined-Japanese-Patent No. 8-275476.

In the above-described conventional permanent magnet rotary motor, a leakage magnetic flux that makes the poles magnetically occurs between adjacent permanent magnets with the poles interposed therebetween, thereby reducing the effective magnetic flux. Therefore, in order to obtain more driving torque, the permanent magnet must be enlarged or the excitation current of the stator winding must be increased, but the size of the motor is increased, the weight is increased, or the power consumption is increased.

If one motor is to function as a starter motor when the internal combustion engine is started, and as a generator when the vehicle is driven, a large drive torque is obtained when the permanent magnet is functioned as a starter motor when the permanent magnet is enlarged as described above. Since the electric power is generated larger than necessary when it functions as a function, the torque (driven torque) required for the internal combustion engine E to drive a starter and a generator device becomes large.

Moreover, in the above-mentioned conventional permanent magnet rotary motor, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet and the width Wsp of the pole in the rotational direction is particularly low when the electrode functions as an electric motor. Greatly affects torque across the globe However, in the above-mentioned prior art, the relationship of the ratio [Wmg: Wsp] to the increase in friction when operating the permanent magnet rotary motor as a generator is not considered.

In the permanent magnet rotary motor of the above-described structure, since the pole portion functions as a part of the permanent magnet, it is preferable to energize the rotary motor by an angle corresponding to the width Wsp of the pole portion. However, in the above-mentioned prior art, the relationship between the width Wsp and the angle of advance of the pole portion has not been considered.

The first object of the present invention is to solve the above-mentioned technical problems of the prior art, so that a large driving torque is obtained when functioning as a starter motor, and a driven torque is reduced when acting as a generator, and permanent magnet rotation as a starter and generator device. It is to provide an electric motor.

The second object of the present invention is to solve the above-mentioned problems of the prior art and to provide a permanent magnet rotary motor in which the ratio (Wmg: Wsp) of the width (Wmg) of the permanent magnet and the width (Wsp) of the permanent magnet is optimized. have.

A third object of the present invention is to provide a drive device for a permanent magnet rotary motor in which the above-mentioned problems of the prior art are solved and the relationship between the width Wsp of the pole and the degree of advancement of electricity is optimized.

1 is an overall side view of a scooter type motorcycle which applies the permanent magnet rotary motor of the present invention to a starter and a generator device;

2 is a cross-sectional view along the crank axis of the swing unit of FIG. 1, FIG.

3 is a partially broken plan view from a plane perpendicular to the rotational axis (crankshaft) of the starter and generator device (permanent magnet rotary motor),

4 is a side cross-sectional view of FIG.

5 is a plan view of the rotor yoke,

6 is a side view of the rotor yoke,

7 is a partially enlarged view of the rotor yoke;

8 is a block diagram of a control system of the starter and generator device;

9 is a view for explaining the function (motor movement) of the air gap formed in the rotor yoke;

10 is a view for explaining the function (during power generation) of the gap formed in the rotor yoke;

11 is a view showing a plane shape of a rotor yoke according to a second embodiment of the present invention;

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

13 is a view showing a plane shape of a rotor yoke according to a third embodiment of the present invention;

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

15 is a view showing a plane shape of a rotor yoke according to a fourth embodiment of the present invention;

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

17 is a view showing a planar shape of the rotor yoke in a fifth embodiment of the present invention;

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

19 is a view showing a plane shape of a rotor yoke according to a sixth embodiment of the present invention;

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

21 is a partially enlarged view of FIG. 9;

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

FIG. 23 is a diagram showing the relationship between the advancing timing and torque of the energization timing using the rotor rotation speed as a parameter ([Wmg: Wsp] is approximately [5: 1]) in 120 ° energization control;

FIG. 24 is a diagram showing the relationship between the advancing timing and torque of the energization timing using the rotor rotational speed as a parameter ([Wmg: Wsp] is approximately [4: 1]) in the 120 ° energization control.

FIG. 25 is a diagram showing the relationship between the advancing timing and torque of the energization timing using the rotor rotational speed as a parameter ([Wmg: Wsp] is approximately [2.8: 1]) in the 120 ° energization control.

Fig. 26 is a diagram showing the relationship between the advancing timing and torque of the energization timing using the rotor rotational speed as a parameter ([Wmg: Wsp] is approximately [5: 1]) in 180 ° energization control.

Fig. 27 is a diagram showing the relationship between the advancing timing of the energization timing and torque in the 180 ° energization control using the rotor rotational speed as a parameter ([Wmg: Wsp] is approximately [4: 1]),

Fig. 28 is a diagram showing the relationship between the advancing timing and torque of the energization timing using the rotor rotational speed as a parameter ([Wmg: Wsp] is approximately [2.8: 1]) in 180 ° energization control;

Fig. 29 is a graph showing the relationship between the residual thickness H of the rotor yoke at the tip of the slit, the ratio H / W of the slit width W, and the drive torque;

It is a figure which shows the relationship between the ratio (H / W) of the residual thickness H of the rotor yoke and the slit width W, and the driven torque at the slit tip.

<Explanation of symbols for main parts of drawing>

One … Starter and generator device 50.. Stator

51. Stator core 52.. Stator pole

53. Stator winding 60.. Outer rotor

61. Rotor yoke 62. (62N, 62S) Permanent Magnet

63. Rotor case 71. Protective cover

201... Crank shaft 611... Opening

612. Slit (first void) 613. Bower part

614. Slit (second void)

In order to achieve the above-mentioned first object, the present invention provides a substantially cylindrical rotor yoke for rotating the outer periphery of the stator, with a plurality of magnet insertion holes interposed therebetween, with the poles interposed therebetween, permanently in each magnet insertion hole. In a permanent magnet rotary motor having a magnet inserted therein, the magnet insertion hole includes a main opening portion into which the permanent magnet is inserted, and a slit extending in a predetermined width (W) from both ends to the center portion in the circumferential direction of the main opening portion. (First void) and the remaining thickness H of the rotor yoke at the tip of the slit and the slit width W satisfy a relationship of 0.3 ≦ residual thickness H / slit width W ≦ 0.7 Characterized in that.

Increasing the slit width is equivalent to thinning the remaining thickness H, which is disadvantageous from the viewpoint of reducing the driven torque. On the contrary, thickening the residual thickness H is disadvantageous in terms of increasing the driving torque. Therefore, increasing the slit width W increases the driving torque and thickening the residual thickness H of the rotor yoke to reduce the driven torque. This is a yield-breaker, and both ratios H / W should be set low when giving priority to the increase in drive torque, and high when giving priority to reduction of driven torque. However, if 0.3? Residual thickness H / slit width W? 0.7, both the drive torque and the driven torque can be effectively achieved.

In order to achieve the above-mentioned second and third objects, the present invention is characterized by taking the following means.

(1) In a permanent magnet rotary motor in which a substantially cylindrical rotor yoke rotating the outer circumference of the stator is arranged with a plurality of magnet insertion holes interposed therebetween in the circumferential direction, and a permanent magnet is inserted into each magnet insertion hole. And the ratio [Wmg: Wsp] of the permanent magnet width Wmg and the pole width Wsp in the rotational direction is approximately [5: 1].

(2) A substantially cylindrical rotor yoke rotating the outer circumference of the stator is arranged along the circumferential direction with a plurality of magnet insertion holes interposed therebetween, and driving a permanent magnet rotary motor in which permanent magnets are inserted into each magnet insertion hole. In the circuit, the phase of the alternating current supplied to each phase of the permanent magnet rotary motor is advanced by an angle corresponding to 1 to 1.5 times the width Wsp of the pole relative to the rotational direction.

According to each of the above features, when the permanent magnet rotary motor is functioned as an electric motor, not only an improvement in torque is particularly achieved at a low rotational range, but also a friction is reduced when the permanent magnet rotary motor is functioned as a generator, thereby realizing a rotary motor with excellent balance. have.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is an overall side view of a scooter type motorcycle which applies the permanent magnet rotary motor of the present invention to a starter and generator device.

The whole body 3a and the body rear part 3b are connected via the low floor part 4, and the body frame which forms the frame | skeleton of a body mainly consists of the down tube 6 and the main pipe 7. As shown in FIG. The fuel tank and the storage box (both not shown) are supported by the main pipe 7, and the sheet 8 is disposed above the fuel tank and the storage box.

In the whole vehicle body 3a, the steering wheel 5 is axially supported, the handle 11 is installed upward, the fork 12 is connected all the lower side, and the front wheel FW is axially supported by the lower end. The upper part of the handle 11 is covered with a handle cover 13 which also serves as an instrument panel. A bracket 15 protrudes from the lower end of the riser of the main pipe 7, and the hanger bracket 18 of the swing unit 2 is pivotally connected to the bracket 15 via the link member 16. have.

The swing unit 2 is equipped with the 2-stroke internal combustion engine E of a short cylinder in the whole. The belt type continuously variable transmission 26 is comprised from this internal combustion engine E to the rear, and the rear wheel RW is axially supported by the deceleration mechanism 27 provided through the centrifugal clutch in the rear part. A rear cushion 22 is interposed between the upper end of the deceleration mechanism 27 and the upper bent portion of the main pipe 7. All of the swing units 2 are provided with a vaporizer 24 connected to the intake pipe 23 extending from the internal combustion engine E and an air cleaner 25 connected to the vaporizer 24. have.

2 is a cross-sectional view of the swing unit 2 cut along the crankshaft 201, and the same reference numerals indicate the same or equivalent parts.

The swing unit 2 is covered with the crankcase 202 formed by incorporating the left and right crankcases 202L and 202R, and the crank shaft 201 is attached to the bearings 208 and 209 fixed to the crankcase 202R. It is rotatably supported by the. A connecting rod (not shown) is connected to the crank shaft 201 through the crank pin 213.

The left crankcase 202L also serves as a belt type CVT case, and a belt drive pulley 210 is rotatably provided on the crankshaft 201 extending to the left crankcase 202L. The belt drive pulley 210 is composed of a fixed side pulley half body 210L and a movable side pulley half body 210R, and the fixed side pulley half body 210L is fixed to the left end of the crank shaft 201 through a boss 211. It is attached, and the movable pulley half body 210R is splined to the crankshaft 201 on the right side, and can approach and carry over the fixed side pulley half body 210L. The V belt 212 is wound between both pulley halves 210L and 210R.

On the right side of the movable side pulley half body 210R, the cam plate 215 is fixedly attached to the crankshaft 201, and the slide piece 215a provided at the outer circumferential end thereof is provided at the outer peripheral end of the movable side pulley half body 210R. It is slidably coupled to the cam plate slide boss portion 210Ra formed in the axial direction. The cam plate 215 of the movable side pulley half body 210R has a tapered surface whose outer circumference is inclined toward the movable side pulley half body 210R side, and a dry weight is placed on an empty portion between the tapered surface and the movable pulley half body 210R. The pole 216 is housed.

When the rotational speed of the crank shaft 201 increases, the dry weight pawl 216 rotating together between the movable side pulley half body 210R and the cam plate 215 moves in the centrifugal direction by centrifugal force, and the movable side pulley half body 210R is pushed by the dry weight pole 216 to the left to approach the fixed side pulley half body 210L. As a result, the V belt 212 sandwiched between the two pulley halves 210L and 210R moves in the centrifugal direction and the wound diameter thereof becomes large.

A driven pulley (not shown) corresponding to the belt drive pulley 210 is provided at the rear of the vehicle, 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 to drive the rear wheel RW through the reduction mechanism 27 or the like.

In the right crankcase 202R, the starter and generator device 1 which combined the starter motor and an AC generator is arrange | positioned. In the starter and generator device 1, the external rotor 60 is fixed to the tip taper surface of the crankshaft 201 by the screws 253. The inner stator 50 disposed inside the outer rotor 60 is screwed to and supported by the crankcase 202 by bolts 279. In addition, the structure of the said starter and generator apparatus 1 is demonstrated in detail later with reference to FIGS.

The fan 280 is fixedly attached to the lower portion of the central cone portion 280a to the outer rotor 60 by bolts 246, and the fan 280 is attached to the fan cover 281 through the radiator 282. Covered by

The sprocket 231 is fixed between the starter and generator device 1 and the bearing 209 on the crank shaft 201, and the sprocket 231 drives a cam shaft (not shown) from the crank shaft 201. The chain for winding is wound. In addition, the sprocket 231 is formed integrally with the gear 232 for transmitting power to the pump for circulating the lubricating oil.

3 and 4 are partially broken plan views and side cross-sectional views of the starter and generator device 1 (permanent magnet rotary motor) perpendicular to the rotational axis (crankshaft 201), and FIGS. 5 and 6 are views of the rotor yoke. It is a top view and the partial enlarged view, and all the same code | symbol as the above has shown the same or equivalent part.

The starter and generator device 1 of this embodiment is comprised from the stator 50 and the outer rotor 60 which rotates the outer periphery of the said stator 50, as shown to FIG. 3, 4, The said outer rotor 60 As shown in Figs. 4 and 5, the rotor yoke 61 formed by laminating a ring-shaped silicon steel sheet (thin plate) in a substantially cylindrical shape, and the rotor yoke 61 in the circumferential direction as shown in Figs. N-pole permanent magnets 62N and S-pole permanent magnets 62S alternately inserted into the formed openings 611 and the rotor yoke 61 as shown in Figs. It is comprised by the cup-shaped rotor case 63 connected to the.

The rotor case 63 has a claw portion 63a at a circumferential end thereof, and the rotor yoke 61 of the laminated structure is fitted in the axial direction by bending the claw portion 63a inwardly. In addition, each of the permanent magnets 62 (62N, 62S) inserted through the opening 61 of the rotor yoke 61 is held at a predetermined position in the rotor yoke 61.

The stator 50 is constructed by stacking silicon steel sheets (thin plates), and includes a stator core 51 and a stator salient pole 52 as shown in FIG. A stator winding 53 is wound around each stator salient pole 52 in a unipolar concentrated manner, and 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 is provided with 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 in the circumferential direction of each of the openings 611, slits 614 (second voids) extending in a predetermined width toward the center are formed. The adjacent openings 611 function as the complementary portions 613. In each of the openings 611, a permanent magnet 62 having a substantially drum-shaped cross section is inserted as shown in FIG. As shown in FIG. 6, the width [Wmg: Wsp] of the width of the opening 611 in the rotational direction, that is, the width Wmg of the permanent magnet 62 and the width Wsp of the complementary electrode 613 is approximately [5]. : 1].

In each of the openings 611, a permanent magnet 62 having a substantially drum-shaped cross section is inserted as shown in FIG. 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 in the state where the permanent magnet 62 is inserted into the opening 611, each permanent magnet 62 is provided. Slits (first voids) 612 are formed at both sides along the circumferential direction of, and the slits 614 remain at the stator sides at both ends of each permanent magnet 62.

8 is a block diagram of the control system of the starter and generator device 1, wherein the same reference numerals indicate the same or equivalent parts.

The control unit 40 controls the power supply to the IG coil 41 and the DC-DC converter 102 for converting the output voltage VBATT of the battery 42 into the logic voltage VDD and supplying it to the CPU 101. The ignition control device 103 for igniting the spark plug 43 at a predetermined timing, and converting the battery voltage VBATT into three-phase AC power to supply the stator winding 53 of the starter and generator device 1. A three-phase driver 104.

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

In such a configuration, at engine start-up, the CPU 101 determines the excitation timing of the stator winding 53 based on the rotational position of the external rotor 60 detected by the rotor sensor 46, and determines the three-phase driver ( The switching timing of each power FET of 104 is controlled to supply AC power to each phase of the stator winding 53.

Each power FET Tr1 to Tr6 of the three-phase driver 104 is PWM controlled by the CPU 101, and the duty ratio, that is, the driving torque, is controlled based on the rotational speed of the external rotor 60.

On the other hand, when the internal combustion engine E is started, feeding from the three-phase drive 104 to the stator winding 53 is stopped, and this time, the starter and generator device 1 is driven driven by the internal combustion engine E. do. At this time, electromotive force is generated in the stator winding 53 in accordance with the rotational speed of the crankshaft 201. The electromotive force is controlled by the battery voltage VBATT by the regulator 44, and the remaining power is charged to the battery 42 while being supplied to the electric load.

23, 24 and 25 all show the relationship between the advancing degree (°) and torque (N / m) of the energization timing as the rotor rotation speed (rpm) as a parameter in the 120 ° energization control. 25 indicates that the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62 and the width Wsp of the pole electrode 613 is approximately [5: 1], approximately [4: 1], approximately [2.8: 1] ]to be.

Comparing the figures, in the example of [5: 1] shown in Fig. 23, high torque is generated in the range of 4 ° to 5 ° to 7 ° to 8 ° regardless of the height of the rotor rotation. . On the other hand, in the examples of approximately [4: 1] shown in FIG. 24 and approximately [2.8: 1] shown in FIG. 25, especially when the rotor rotation speed is low (40 rpm), increasing the advance angle increases the torque drop.

26, 27 and 28 all show the relationship between the advancing degree (°) and torque (N / m) of the energization timing as the rotor rotation speed (rpm) as a parameter in the 180 ° energization control. 28 indicates that the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62 and the width Wsp of the pole electrode 613 is approximately [5: 1], approximately [4: 1], approximately [2.8: 1] ]to be.

Comparing the figures, in the example of approximately [5: 1] shown in Fig. 26, high torque is generated in the range of 5 ° to 7 ° to 8 ° especially when the rotor rotation speed is low. In contrast, in the examples of approximately [4: 1] shown in FIG. 27 and approximately [2.8: 1] shown in FIG. 28, the torque when the rotor rotation speed is low is lower than that of the approximately [5: 1] shown in FIG. fell.

Thus, according to the experimental results of the inventors, in any case of 120 ° energization and 180 ° energization, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 12 and the width Wsp of the complementary electrode 613 was approximately [5]. : 1], it can be seen that high torque is obtained especially at the low rotation range of the rotor. In addition, it is understood that particularly high torque is obtained by setting the degree of advancement from 5 ° to 7 ° to 8 °, that is, 1 to 1.5 times the angle of the pole 613 (5 ° in the present embodiment).

Next, the action of the slit 614 formed in the rotor yoke 61 and the cavity 612 formed between the rotor yoke 61 and the permanent magnet 62 will be described with reference to FIGS. 9 and 10. .

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

When the starter and generator device 1 functions as a starter motor, an excitation current is supplied from the battery 42 to the respective stator windings 53 through the control unit 40, as shown in FIG. 9. The magnetic force lines generated in the radial direction from the stator salient pole 52N that are excited are pulled from the stator side surface of the S-pole permanent magnet 62S to the back side, and most of them are the core part 615 and the pole part 613 of the rotor yoke 61. ) Is returned to the stator protrusion 52N excited to the N pole via the stator protrusion 52S excited to the adjacent S pole and the stator core 51.

At this time, in this embodiment, the space | gap 612 is formed in the both sides along the circumferential direction of each permanent magnet 62, and since the leakage magnetic flux from the side of each permanent magnet 62 to the pole part 613 is reduced, Most of the magnetic force lines fall from the permanent magnets 62 to the core portion 615 of the rotor yoke 61 and reach the stator 50 side via the pole portion 613. As a result, since the vertical component of the magnetic flux passing through the air gap between the outer rotor 60 and the stator 50 increases, it becomes possible to increase the drive torque as compared with the case where the void 612 is not formed.

In addition, in this embodiment, since the slit 6140 for restricting the circumferential magnetic path is 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 reduced.

That is, as shown in an enlarged view of the dotted circle in FIG. 9 in FIG. 21, one side 614A of the slit (second void) 614 is stator protrusion 52S from the pole portion 613 of the rotor yoke 61. And the other side 614B of the void 614 passes the magnetic flux B2 passing through the inner circumferential portion 616 of the rotor yoke 61 from the permanent magnet 62N. It acts to guide efficiently to the stator pole 52S. 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 it becomes possible to further increase the drive torque as the starter motor.

On the other hand, when the starter and generator device 1 functions as a generator, as shown in Fig. 10, the magnetic flux generated from each permanent magnet 62 forms a waste path together with the stator salient pole and the stator core, so that the rotor rotates. A number of generating currents can be generated in the stator windings.

In addition, in this embodiment, when the regulator voltage by the said regulator 44 is set to 14.5V, and the output voltage at the time of making the said starter / generator device 1 function as a generator reaches the said regulator voltage, it is in the said power FET. The transistors Tr2, Tr4, and Tr6 on the ground side are shorted. As a result, a short current flows into each of the stator windings 53 in a delay phase, and a magnetic force line passing through the stator 50 decreases, thereby increasing the leakage magnetic flux connecting the adjacent permanent magnets 62. The driven torque of the cum generator device 1 is reduced, and the load of the internal combustion engine E is reduced.

That is, as shown in an enlarged view in the dotted circle of FIG. 10 in FIG. 22, between the adjacent permanent magnets 62S and 62N, the magnetic flux B3 passing through the outer circumferential portion 617 of the rotor yoke 61, The magnetic flux B4 passing through the pole portion 613 of the rotor yoke 61, the magnetic flux B5 passing through the inner circumferential portion 616 of the rotor yoke 61, and the inner circumferential portion of the rotor yoke 61. 616, an air gap, and a magnetic flux B6 via the stator salient pole 52N are generated.

As described above, according to the present embodiment, in the permanent magnet rotary motor of the rotor yoke 61 of the outer rotor 60 having the pole portion 613 between the permanent magnets 62, each permanent magnet 62 Since a gap 612 (614) is formed between the rotor yoke and the rotor yoke 61, the leakage magnetic flux between adjacent permanent magnets is reduced, so that the air gap between the outer rotor 60 and the stator 50 crosses vertically. The magnetic flux increases. Therefore, the drive torque at the time of functioning as a starter motor can be increased, without increasing the driven torque at the time of operating the permanent magnet rotary motor as a generator.

In addition, as is clear from the above description, when the permanent magnet rotary motor functions as a starter motor, as shown in FIG. 21, driving is performed by interrupting the magnetic fluxes B1 and B2 with the slits (second voids) 614A and 614B. Since the torque is increased, the wider the width W of each slit 6140 is, the better it is.

On the other hand, when the permanent magnet rotary motor functions as a generator, the driven torque is reduced by sufficiently securing the magnetic flux of the leakage magnetic flux B5 as shown in Fig. 22, so that each slit 614 is enlarged on the right side of the figure. The thicker the remaining thickness (H) of the rotor yoke at the tip of), the better.

In this case, when the slit width W is widened, the leakage magnetic flux B5 in FIG. 22 is reduced, which is equivalent to thinning the residual thickness H, which is disadvantageous from the viewpoint of reducing the driven torque. On the contrary, thickening the remaining thickness H at the tip of the slit reduces the effective component (amount induced to the stator side) of the magnetic fluxes B1 and B2 in Fig. 21, which is equivalent to narrowing the slit width W, thereby driving torque. It is disadvantageous from the viewpoint of increasing. Therefore, widening the slit width W to increase the driving torque and thickening the residual thickness H of the slit tip to reduce the driven torque are yieldingly unfavorable. It should be set low when giving priority to increase, and high when giving priority to reduction of driven torque.

29 and 30 show the relationship between the ratio H / W, the drive torque (Fig. 29) and the driven torque (Fig. 30), respectively, and the remaining thickness of the rotor yoke at the tip of the second void (slit) 614. The figure shows (H) as a parameter. In addition, the driven torque of FIG. 30 has shown that it becomes large, so that the absolute value becomes large.

As shown in Fig. 29, the drive torque tends to increase with the decrease of (H / W), but the increase rate slows down when (H / W) is less than about 0.3. In contrast, the driven torque tends to increase with the decrease of (H / W) as shown in Fig. 30, and the increase rate increases when (H / W) is less than about 0.3. Therefore, it is understood that the slit width W and the remaining thickness H are preferably set such that both ratios H / W are 0.3 or more.

In addition, as shown in FIG. 30, the reduction rate of the driven torque tends to be slowed down from the vicinity where (H / W) exceeds about 0.5, and the reduction rate of the drive torque is in the range of (H / W) of 0.5 to 0.7. It tends to slow down. Therefore, it is preferable to set (H / W) to 0.7 or less, and it can be said that 0.5 is optimal.

From the above experiment results, according to this embodiment, by setting (H / W) to the range of 0.3-0.7, both drive torque and driven torque can be effectively compatible, and by setting (H / W) to 0.5 or its vicinity , Both the driving torque and the driven torque can be achieved most effectively.

FIG. 11 is a plan view of the rotor yoke 61a according to the second embodiment of the present invention, and FIG. 12 is a state in which the permanent magnet 62a is inserted through the opening 611a of the rotor yoke 61a. It is a partial enlarged view, and the same code | symbol as the above has shown the same or equivalent part.

In this embodiment, the opening part 611a of the rotor yoke 61a is substantially die-shaped, and the permanent magnet 62a which has a rectangular cross section is inserted through the said opening part 611a. As a result, air gaps 612a are formed at both sides in the circumferential direction of the permanent magnets 62a to prevent leakage magnetic flux between adjacent permanent magnets 62a, and at both ends of each permanent magnet 62a. Since the air gap 614a for limiting the circumferential magnetic path is formed also on the stator side of, the same effect as described above is achieved. Also in this embodiment, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62a to the rotational direction 613 in the rotation direction is set to approximately [5: 1].

Fig. 13 shows a planar shape of the rotor yoke 61b according to the third embodiment of the present invention. Fig. 14 shows the permanent magnet 62b inserted through the opening 611b of the rotor yoke 61b. It is a partial enlarged view, and the same code | symbol as the above has shown the same or equivalent part.

In the present embodiment, the opening 611b of the rotor yoke 61b has a drum shape having a different shape, and a permanent magnet 62b having a drum shape in cross section is inserted through the opening 611b. As a result, slits (first voids) 612b are formed on both sides of the permanent magnet 62b in the circumferential direction to prevent leakage magnetic flux between adjacent permanent magnets 62b, and each permanent magnet 62b. Since the slits (second voids) 614b for limiting the circumferential magnetic path are also formed on the stator side at both ends of the end), the same effect as described above is achieved. Moreover, also in this embodiment, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62b with respect to the rotation direction and the width Wsp of the complementary pole 613 is set to about [5: 1].

Fig. 15 shows a planar shape of the rotor yoke 61c according to the fourth embodiment of the present invention. Fig. 16 shows the permanent magnet 62c inserted through the opening 611c of the rotor yoke 61c. It is a partial enlarged view, and the same code | symbol as the above has shown the same or equivalent part.

In this embodiment, the opening 611c of the rotor yoke 61c has another shape in which cutouts are formed at both sides of the drum-shaped portion, and the permanent magnet 62c having a drum-shaped cross section is inserted through the opening 611a. have. As a result, air gaps 612c are formed at both sides in the circumferential direction of the permanent magnets 62c to prevent leakage magnetic flux between adjacent permanent magnets 62c, and at both ends of each permanent magnet 62c. The same effect as described above is achieved because the air gap 614c is formed on the stator side to limit the circumferential magnetic path. In addition, also in this embodiment, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62c and the width Wsp of the complementary electrode 613 with respect to the rotation direction is set to about [5: 1].

FIG. 17 is a plan view of the rotor yoke 61d according to the fifth embodiment of the present invention, and FIG. 18 is a state in which the permanent magnet 62d is inserted through the opening 611d of the rotor yoke 61d. It is a partial enlarged view, and the same code | symbol as the above has shown the same or equivalent part.

In the present embodiment, the opening 611d of the rotor yoke 61d has a drum shape having a different shape, and the permanent magnet 62d having a drum shape in cross section is inserted through the opening 611d. As a result, voids 612d are formed at both sides in the circumferential direction of the permanent magnet 62d to prevent leakage magnetic flux between adjacent permanent magnets 62d.

In addition, apart from the opening portion 611d, a space 614d for restricting the circumferential magnetic path is formed in a cutout shape at the inner circumference of the rotor yoke 61d corresponding to both ends of the permanent magnet 62d. The same effect as above is achieved. Moreover, also in this embodiment, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62d with respect to the rotation direction and the width Wsp of the pole 613 is set to about [5: 1].

Fig. 19 shows a planar shape of the rotor yoke 61e according to the sixth embodiment of the present invention. Fig. 20 shows the permanent magnet 62e inserted through the opening 611e of the rotor yoke 61e. It is a partial enlarged view, and the same code | symbol as the above has shown the same or equivalent part.

In the present embodiment, the opening 611e of the rotor yoke 61e has a drum shape having a different shape, and a permanent magnet 62e having a drum shape in cross section is inserted through the opening 611e. As a result, air gaps 612e are formed at both sides in the circumferential direction of the permanent magnets 62e to prevent leakage magnetic flux between adjacent permanent magnets 62e, and at both ends of each permanent magnet 62e. Since the air gap 614e for limiting the circumferential magnetic path is formed also on the stator side of, the same effect as described above is achieved. Also in this embodiment, the ratio [Wmg: Wsp] of the width Wmg of the permanent magnet 62e and the width Wsp of the complementary electrode 613 in the rotation direction is set to approximately [5: 1].

As described above, according to the present invention, in the permanent magnet rotary motor having the rotor yoke of the outer rotor between the permanent magnets, both the driving torque and the driven torque can be effectively balanced. Therefore, the drive torque at the time of functioning as a starter motor can be increased, without increasing the driven torque at the time of operating the permanent magnet rotary motor as a generator.

As described above, according to the present invention, in the permanent magnet rotary motor in which the rotor yoke of the outer rotor has a pole between each permanent magnet, the ratio of the width (Wmg) and the pole (Wsp) of the permanent magnet with respect to the rotational direction [Wmg] : Wsp] is optimized, and the advance of the AC current supplied to each phase is optimized based on the width of the pole (Wsp) in the rotational direction. When this is achieved and it functions as a generator, the friction in a high rotation range can be reduced.

Claims (6)

In the permanent magnet type rotary motor of which a substantially cylindrical rotor yoke rotating the outer periphery of the stator is arranged along the circumferential direction with a plurality of magnet insertion holes interposed therebetween, and a permanent magnet inserted into each magnet insertion hole. The magnetic insertion hole, A main opening part into which the permanent magnet is inserted, A slit extending in a predetermined width (W) from both ends toward the center portion in the circumferential direction of the main opening, Permanent magnet rotary motor, characterized in that the remaining thickness (H) of the rotor yoke and the slit width (W) at the tip of the slit satisfy the relationship of 0.3≤ residual thickness (H) / slit width (W) ≤ 0.7 . The permanent magnet rotary motor of claim 1, wherein the residual thickness (H) / slit width (W) is approximately 0.5. The permanent magnet rotary motor according to claim 1 or 2, wherein the permanent magnet rotary motor functions as an electric motor below a predetermined rotational speed, and functions as a generator above the predetermined rotational speed. In the permanent magnet type rotary motor of which a substantially cylindrical rotor yoke rotating the outer periphery of the stator is arranged along the circumferential direction with a plurality of magnet insertion holes interposed therebetween, and a permanent magnet inserted into each magnet insertion hole. And a ratio [Wmg: Wsp] of the width Wmg of the permanent magnet and the width Wsp of the pole relative to the direction of rotation is approximately [5: 1]. 5. The permanent magnet rotary motor of claim 4, wherein the permanent magnet rotary motor functions as an electric motor below a predetermined rotational speed, and functions as a generator above the predetermined rotational speed. In a substantially cylindrical rotor yoke rotating the outer periphery of the stator, a plurality of magnet insertion holes are arranged along the circumferential direction of the magnets, and a permanent magnet is inserted into each magnet insertion hole. , Permanent magnet rotation characterized by advancing the phase of the alternating current supplied to each phase of the permanent magnet rotary motor by an angle corresponding to 1 to 1.5 times the width Wsp of the pole relative to the rotation direction. Drive of electric motor.