JP2003324873A - Ac generator for vehicle and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC generator capable of preventing the thermal demagnetization of permanent magnets arranged between claw-shaped poles, and to provide a manufacturing method therefor. <P>SOLUTION: A rotor 100 comprises claw-shaped poles 108, a field winding 107 and the neodymium permanent magnets 117, and further comprises a stator 102 and a water passage 114 which is arranged at the external periphery of the stator 102 and through which cooling water lubricates. A plurality of grooves 108G are formed in the surface of each claw-shaped pole 108. On the rear side relative to the rotative direction of the claw-shaped pole, which is the surface of the claw-shaped pole 108, there are formed a bevel 108B1, that is a chamfer for elongating the length of a gap between the internal peripheral surface of the stator and the surface of the claw-shaped pole, and a step 108S1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle AC generator and a method of manufacturing the same, and more particularly to a liquid-cooled vehicle AC generator suitable for use in an automobile power generator and a method of manufacturing the same.

[0002]

2. Description of the Related Art In conventional vehicle AC generators, the following five types are known for providing a groove on a claw-shaped magnetic pole. First, as described in U.S. Pat. No. 3,571,637, it is known to provide a groove on the claw surface of a claw-shaped magnetic pole composed of a massive iron core to prevent eddy currents. Secondly, as described in Japanese Utility Model Laid-Open No. 62-98443, it is known that the shape of the groove has a characteristic. Thirdly, it is known to provide a V-shaped groove as described in JP-A-59-89538. Fourthly, as described in Japanese Patent No. 3049715, a claw-shaped magnetic pole surface having grooves arranged in various directions is known. Fifth, JP-A-9-24
As described in Japanese Patent No. 7915, there is known one in which grooves are arranged with the same bevel width. In these examples, a groove is provided on the entire surface of the claw-shaped magnetic pole to reduce the eddy current.

Further, as another structure of the conventional AC generator, sixthly, as described in US Pat. No. 3,271,606, an air gap on the rear side of rotation of the rotor is described. It is known that the is widened from the front side of rotation. Seventh, as described in Japanese Patent Application Laid-Open No. 9-215288, there is known one having a characteristic bevel size ratio. In these examples, the magnetic noise reduction is aimed at by making the edge of the portion corresponding to the rotation rear side of the claw-shaped magnetic pole larger than the inclination width of the claw pole edge on the front side of rotation.

Eighthly, JP-A-3-74163.
As described in Japanese Patent Laid-Open Publication No. JP-A-2003-264, it is known that the outer diameter of the portion of the claw-shaped magnetic pole facing the stator winding at the axial end is small. In this example, the outer diameter of the claw-shaped magnetic pole end is reduced to reduce wind noise and fan noise.

[0005]

The eddy current actually generated on the surface of the claw-shaped magnetic pole is not uniformly generated on the entire surface of the claw-shaped magnetic pole, but the magnetic flux on the surface of the claw is generated by the armature reaction due to the generated current during power generation. Distribution occurs in the density.

Since the AC generator according to the present invention has a small size and a high output, when a structure having a high residual magnetic flux such as a neodymium permanent magnet is arranged between the claw-shaped magnetic poles, the following problems occur. Will occur. That is, when a high residual magnetic flux such as a neodymium permanent magnet is arranged between the claw-shaped magnetic poles, the magnetic flux density on the entire claw surface increases by 30 to 40%, and the magnitude of the eddy current generated on the claw-shaped magnetic pole surface increases. Since it increases in proportion to the square of the magnetic flux density, it increases about 1.7 to 2 times as compared with the conventional example.

In addition, the liquid-cooled vehicle AC generator of the present invention adopts the liquid-cooled type in order to improve the cooling efficiency. In a liquid-cooled AC generator, the entire circumference of the rotor is covered by a housing, and the cooling of the rotor is much worse than air cooling as in the conventional example, so the temperature of the neodymium permanent magnet placed between the poles is very low. It is necessary to reduce the amount of heat generation so that the temperature does not exceed the heat resistant temperature. In the case of the air-cooled type, where there is no magnet between the poles as in the conventional case, it suffices to provide a uniform groove on the entire rotor, and there is no need to consider demagnetization of the magnet at all. In the neodymium permanent magnets currently on the market, it is very important to reduce the heat generation of the rotor because the heat resistance temperature is about 240 ° C. The neodymium permanent magnet has a problem that when the temperature rises, a problem of thermal demagnetization occurs in which the magnetic force decreases.

An object of the present invention is to provide an AC generator which prevents thermal demagnetization of permanent magnets arranged between claw-shaped magnetic poles, and a method of manufacturing the same.

[0009]

(1) In order to achieve the above object, the present invention provides a pair of opposed claw-shaped magnetic poles having a plurality of claws formed at the tip thereof, and the claw-shaped magnetic poles. A field winding for magnetizing a magnetic pole, and a rotor composed of a neodymium permanent magnet for auxiliary excitation arranged between the claw-shaped magnetic poles,
A stator having a stator winding that is arranged at a predetermined distance from the rotor and that generates an AC voltage by the magnetization of the claw-shaped magnetic pole, and a water channel in which cooling water circulates in the outer peripheral portion of the stator. In the vehicular AC generator having the above, the claw-shaped magnetic pole is provided with a plurality of grooves formed in parallel with the rotation direction of the rotor on the surface thereof. With this configuration, in order to prevent thermal demagnetization of the permanent magnets arranged between the claw-shaped magnetic poles, the eddy current loss generated on the surface of the claw-shaped magnetic poles can be reduced.

(2) In the above (1), preferably,
A chamfered portion that is formed on the surface of the claw-shaped magnetic pole on the rear side with respect to the rotation direction of the claw-shaped magnetic pole and widens the gap length between the inner peripheral surface of the stator and the surface of the claw-shaped magnetic pole. Is provided.

(3) In the above (2), preferably,
The chamfered portion is a beveled portion having a shape in which the rear side is scraped off at a predetermined angle with respect to the rotation direction of the claw-shaped magnetic pole.

(4) In the above item (2), preferably,
The chamfered portion is a stepped processing portion whose rear side is stepped with respect to the rotation direction of the claw-shaped magnetic pole.

(5) In the above item (2), preferably,
The groove provided on the surface of the claw-shaped magnetic pole is also formed on the surface of the chamfered portion, and the groove depth formed on the chamfered portion is the same as the groove formed on the claw-shaped magnetic pole other than the chamfered portion. It is shallower than the depth.

(6) In the above item (2), preferably,
The chamfered portion is formed parallel to the skew angle of the claw-shaped magnetic pole.

(7) In the above item (2), preferably,
A beveled portion that is a surface of the claw-shaped magnetic pole and is formed on the front side with respect to the rotation direction of the claw-shaped magnetic pole and widens the gap length between the inner peripheral surface of the stator and the surface of the claw-shaped magnetic pole. Is provided.

(8) In the above (7), preferably,
The width W1 of the chamfered portion is wider than the width W2 of the beveled portion.

(9) In the above item (1), preferably,
The claw-shaped magnetic pole is provided with stepped portions provided on both outer peripheral surfaces in the axial direction so that the outer diameter of the portion facing the stator winding is smaller than the outer diameter of the portion facing the stator. .

(10) In the above (1), preferably, the claw-shaped magnetic pole is provided with a magnet fixing portion for preventing the neodymium permanent magnet arranged between the claw-shaped magnetic poles from protruding. Has a width L1 of 1.0 to 2.5 mm, a thickness H1 of 1.0 to 2.5 mm, a magnetizing direction length L3 of 10 mm or less, and the neodymium magnet. The claw-shaped magnetic poles are arranged so as to be in direct contact with each other.

(11) In the above item (1), preferably, a magnetic ring extending axially from the stator is provided, and the outer peripheral surface of the magnetic ring is substantially the same as the outer peripheral surface of the stator core. Is.

(12) In the above item (1), preferably, a positioning hole for magnetizing is provided on an end surface of the claw-shaped magnetic pole on the pulley side.

(13) In the above item (1), preferably, the rotor is provided with a housing covering the entire circumference so as to form a closed structure.

(14) In order to achieve the above object, the present invention provides a pair of opposed claw-shaped magnetic poles having a plurality of claws formed at their tips, and a field for magnetizing the claw-shaped magnetic poles. A rotor composed of a winding wire and a neodymium permanent magnet for auxiliary excitation arranged between the claw-shaped magnetic poles, and a rotor arranged at a predetermined distance from the rotor, and alternating by the magnetization of the claw-shaped magnetic poles. A stator having a stator winding for generating a voltage,
In the method for manufacturing a vehicle alternator having a water passage in which cooling water circulates on the outer peripheral portion of the stator, the permanent magnet is magnetized by a rotor before the assembly step of inserting the rotor into the stator. The magnet is magnetized by using a magnetizing jig having a magnetizing yoke that is similar to the magnetic pole, and is then assembled in the stator. By such a method, productivity can be improved.

(15) In the above (14), preferably, the magnetizing yoke of the magnetizing jig is configured to be wider than the width of the claw-shaped magnetic pole to be magnetized. The width Ws is 20 times or more the gap between the rotor and the magnetizing yoke when magnetized.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The configuration of an AC generator according to a first embodiment of the present invention will be described below with reference to FIGS. The vehicle alternator according to the present embodiment has a cooling means having a complete liquid cooling structure. First, the overall configuration of the AC generator according to the present embodiment will be described with reference to FIG. FIG. 1 is a sectional view showing the overall configuration of an AC generator according to the first embodiment of the present invention.

The pulley 2 that receives the power of the engine is fixed to the shaft 101. The shaft 101 is supported by two bearings 103A and 103B. Two
Of the individual bearings, the pulley side bearing 103A is
The other bearing 103B, which is disposed on the front bracket 104F, is supported by the housing 115. A rotor 100 is arranged at the center of the two bearings 103A and 103B, and is fixed to the shaft 101 so as to rotate in synchronization with the rotation of the pulley 2. The rotor 100 is provided with a claw-shaped magnetic pole 108. A field winding 107 is arranged on the inner peripheral side of the claw-shaped magnetic pole 108. Further, between the claw-shaped magnetic poles 108 of the rotor 100, a neodymium permanent magnet 117 for auxiliary excitation that enables high output is provided via a permanent magnet holder 118. On the field winding 107, a brush 111 is slidably attached to a slip ring 110 provided on the rotor 100 so that a direct current can be passed. The polarity of the permanent magnet 117 depends on the field winding 10
It is magnetized by a magnetizing jig, which will be described later, so that the same poles as the magnetic poles created when 7 is excited face each other. A positioning hole 130 is provided on the pulley-side end surface of the rotor 100 so as to match the positioning projection of the magnetizing jig.

A three-phase stator winding 106 is wound around a stator core 105 of the stator 102. Stator core 10
5, a housing 115 provided with a water channel 114
Are arranged. Further, the water channels 119 and 120 on the side opposite to the pulleys constitute a closed water channel by covering the housing 115 provided with a groove serving as a water channel with the rear plate 112. The housing 11 serves as a cooling water passage.
5 and the rear plate 112, the IC regulator 113, the diode fin 109 in which the diode is arranged, and the outer peripheral surface of the stator 102 are configured to flow uniformly. As described above, since the AC generator 1 has a completely sealed structure by being water-cooled, the magnetic noise and wind noise generated inside the housing 115 are
It has a structure that does not easily leak to the outside.

Inside the rear bracket 104R on the side opposite to the pulley, an IC regulator 113 for adjusting the generated voltage, a diode minus fin 109B with a rectifying element inserted, and a diode plus fin 109A are arranged. The diode minus fin 109B is
It is arranged on the rear plate 112, and the diode plus fin 109A is arranged thereon. The rectifying element is not limited to the diode, and similar performance can be obtained by using a MOS-FET bridge.
A water channel 119 for cooling the rectifying element is provided on the side of the housing 115 opposite to the pulley, and the water channel 119 is provided.
Has a structure in which the water channel is closed by the rear plate 112. The rectifying element is the rear plate 1
It is fixed at 12.

The rear bracket 104R includes a diode minus fin 109B and a diode plus fin 109A in which rectifying elements are arranged, and an IC regulator 113.
Is fixed to the housing 115 so as to cover the.

In the stator 102, the stator winding 10
A magnetic ring 150 extending from the stator core 105 is arranged on the outer peripheral side of the stator 6, and the good heat conductor 1 is also provided between the other gaps of the housing 115 and between the windings in the stator core 105.
16 are filled. The good heat conductor 116 facilitates transmission of heat generated by the loss generated in the stator winding to the water passage 114, and is made of, for example, unsaturated polyester resin. Although not shown, all the water channels described above have a configuration in which engine cooling water is branched and circulated.

Next, the operation will be described. First, when the pulley 2 is rotated by the engine power with the field winding 107 being DC-excited via the brush 111 and the slip ring 110, the rotor 1 attached to the pulley 2 is rotated.
The claw-shaped magnetic pole 108 of 00 rotates, and
Phase voltage is generated. This three-phase voltage is applied to the diode minus fin 109B and the diode plus fin 109.
By performing full-wave rectification by the rectifying element bridge arranged at A, it is possible to convert to a DC voltage.

The water channel 114 arranged in the housing 115
Are arranged on the outer periphery of the stator core 105, and the iron loss of the stator core 105 generated during power generation and the stator winding 106
It is used as a heat transfer means so as to suppress the temperature rise due to the copper loss generated at. The water channel 114 is connected in series with the cooling water channel 119 of the rectifying element. In this way, the front bracket 104F, the housing 115, and the rear bracket 104 are covered so as to cover the entire rotor 100.
It is composed of R, and is effective for sound insulation of magnetic sound.

Next, the shape of the claw-shaped magnetic pole used in the AC generator according to the present embodiment will be described with reference to FIGS. FIG. 2 is a side view showing the configuration of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. Figure 3
It is the figure which looked at the rotor 1 from the axial direction. Figure 3
FIG. 2 is an enlarged cross-sectional view of the main part of FIG. Also, FIG. 4 and FIG.
FIG. 4 is an explanatory side view regarding the dimensions of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. Note that FIG.
The same reference numerals as in FIG.

As shown in FIGS. 2 and 3, the front claw-shaped magnetic pole 108 will be described as an N-pole side and the opposite side will be an S-pole magnetic pole.
The shape of the claw-shaped magnetic pole 108 of this embodiment is such that both edges of the claw-shaped magnetic pole 108 are formed between the N-pole-side claw-shaped magnetic pole 108N and the S-pole-side claw-shaped magnetic pole 108S in order to prevent the permanent magnet 117 from protruding. Magnet fixing portions 119 are provided on the left and right sides of the portion.
The shape of the stepped portion 124 will be described later with reference to FIG. The alignment hole 130 has three holes as shown.
It is provided in some places.

The thickness H1 of the magnet fixing portion 119 shown in FIG.
Is thicker, the mechanical strength increases as much as possible, but since the thickness of the permanent magnet 117 that can be arranged becomes thin and the magnetic path area that leaks between the poles above the magnet increases, 1.0 m
m-2.5 mm is appropriate, and the permanent magnet 1 when rotating
I try not to let 17 pop out. In this embodiment,
As the radial thickness H1 of the magnet fixing portion 119, 1.5 mm is adopted this time.

Further, the width L1 of the magnet fixing portion 119 shown in FIG. 3 is calculated from the relationship between the mechanical strength and the leakage flux between the poles.
If the width L1 is made large, the inter-electrode width L2 between the adjacent magnet fixing portions 119 becomes narrow, and the magnetic flux easily leaks. In order to reduce the magnetic flux leakage between the poles, the distance L2 is generally set to the rotor 10
It is necessary to secure 0 and about 10 times the gap length of the stator 102. Therefore, when the length L3 of the permanent magnet 117 in the magnetization direction is set to 8 mm, the inter-electrode width L2 is 10 times the main gap 0.5 mm, so that the width L2 is 5 mm.
Is a reasonable value of 1.5 mm.

As the fixed width L1 of the magnet fixing portion 119,
About 1.0 mm to 2.5 mm is desirable. In FIG. 4, the horizontal axis is the magnet fixing portion height H1, and the vertical axis is the effective magnetic flux Φ1.
Is shown. As shown in FIG. 4, the magnet fixing portion height H1
It can be seen that the leakage flux is small and the effective magnetic flux is not significantly reduced when the value is 1.0 to 2.5 mm. Further, FIG. 5 shows the magnitude of the leakage magnetic flux Φ2 when the magnet fixing portion width L1 is taken on the horizontal axis. Magnet fixed part width L1 is 1.0 to
The leakage flux can be made relatively small up to about 2.5 mm.

Next, the shape of the stepped portion 124 of the claw-shaped magnetic pole used in the AC generator according to this embodiment will be described with reference to FIG. FIG. 6 is a front sectional view showing a configuration of a stepped portion of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts.

As shown in FIG. 6, a stepped portion 124 is provided at the outer peripheral end of the claw-shaped magnetic pole 108. The portion of the claw-shaped magnetic pole 108 facing the stator core 105 has a convex shape, and stepped portions 124 are provided at both ends thereof. With respect to the width W1 of the stator core 105, the claw-shaped magnetic pole 10
The width W2 of the central convex portion of 8 is equal to or slightly larger than W1. At both ends of the claw-shaped magnetic pole 108, the width W3,
A stepped portion 124 of W4 is provided and W3 = W4.

The stepped portion 124 is provided to prevent magnetic flux from interlinking with the rotor when a generated current flows in the end portion of the stator winding. That is, since it is difficult for the magnetic flux generated by the generated current to pass, the leakage inductance can be reduced and the generated current can be improved.
Further, since it is possible to make it less likely to be affected by the leakage magnetic flux from the coil end, it is possible to reduce the loss.

Further, as will be described later, even for the groove provided on the rotor surface, that is, the surface of the claw-shaped magnetic pole 108, no groove is provided on the stepped portions 124 at both ends, so that the groove is formed. It is possible to improve workability when sending the bite.

The height H3 of the stepped portion 124 is made larger than the groove depth provided on the rotor surface described later. If it is made too large, the effective sectional area of the magnetic circuit of the rotor is reduced. Therefore, when the cutting groove depth of the groove is 0.5 mm, the maximum height H3 of the stepped portion 124 is about 1.0 mm. Another effect is that it is not affected by thermal expansion of the good thermal conductor 116 filling the coil portion.

Next, the shape of the permanent magnet holder for fixing the permanent magnet used in the AC generator according to the present embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is an explanatory view of a permanent magnet holder for fixing a permanent magnet used in the AC generator according to the first embodiment of the present invention, and is a sectional view of a magnetic center position with respect to an axial direction (X direction) of the rotor. is there. FIG. 8 is a perspective view of a permanent magnet holder used in the AC generator according to the first embodiment of the present invention. 7 and 8, the arrow X direction is the axial direction of the rotor, and the arrow Y direction is the circumferential direction of the rotor. The same reference numerals as in FIG.
The same part is shown.

As shown in FIG. 7, a permanent magnet 117 is arranged between the claw-shaped magnetic pole 108N and the claw-shaped magnetic pole 108S. The claw-shaped magnetic pole on the N-pole side is 108N, the claw-shaped magnetic pole on the S-pole side is 108S, and a magnet fixing portion 119 for preventing the permanent magnet 117 from protruding is provided inside thereof. A permanent magnet 117 is inserted inside the permanent magnet holder 118 and is arranged between the claw-shaped magnetic poles 108. Permanent magnet holder 1
Reference numeral 18 is made of a non-magnetic thin stainless material.

As shown in FIG. 8, the magnet holder 118
Has two claws 118a for preventing the permanent magnet 117 from falling.
And two claws 118b for fixing to the claw-shaped magnetic pole 108.
It consists of

Next, the surface shape of the claw-shaped magnetic pole used in the AC generator according to the present embodiment and its effect will be described with reference to FIGS. 9 to 11. FIG. 9A is a schematic plan view of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention as viewed from above. FIG. 9B is a in FIG. 9A.
It is a-a 'sectional view. In FIG. 9A, the arrow R direction is the rotation direction of the rotor. FIG. 10 is a cross-sectional view taken along the line aa ′ of FIG. 9 (A) showing another example of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention seen from above. Figure 1
FIG. 1 is an explanatory diagram of magnetic flux density used in the AC generator according to the first embodiment of the present invention. The same reference numerals as in FIG.
The same part is shown.

As shown in FIG. 9 (A), when the claw-shaped magnetic pole rotates in the direction of arrow R, in the portion UPφ indicated by an ellipse in the figure, as shown by the solid line G1 in FIG. The main magnetic flux increases. This phenomenon is called an armature reaction, and in the case of a generator, the magnetic flux density on the rear side with respect to the rotation direction increases. On the opposite side (front side with respect to the rotation direction), the main magnetic flux is weakened and demagnetized. Therefore, during power generation, a distribution occurs in the magnetic flux density on the surface of the claw-shaped magnetic pole.

Since the magnetic flux density rises in the portion indicated by the ellipse in the figure, the fluctuation value of the magnetic flux density due to the slot ripple increases during rotation. Since the eddy current loss increases in proportion to the square of the fluctuation of the magnetic flux density, it is possible to reduce the loss by lowering the fluctuation value of the magnetic flux density. In order to make the magnetic flux density of this portion uniform, it is possible to widen the gap length between the inner peripheral surface of the stator and the outer peripheral surface of the rotor. Therefore, specifically, as shown in FIG. 9B, a beveled portion 108B1 which is a chamfered portion is provided on the rear side in the rotation direction of the claw-shaped magnetic pole 108. Details of the bevel processing unit will be described later with reference to FIG. The bevel processing portion 108B1 has a constant width. That is, FIG.
In (A), the width W5 of the beveled portion 108B1 = W
It is 6. Noise can be reduced by making the angle of the beveled portion 108B1 equal to the skew angle of the claw-shaped magnetic pole. A beveled portion 108B2 is also provided on the front side of the claw-shaped magnetic pole 108 in the rotating direction.

By providing the beveled portion 108B1, the magnetic flux density on the rear side in the rotating direction of the claw-shaped magnetic pole 108 can be reduced as shown by the broken line G2 in FIG.
This makes it possible to reduce the loss.

In order to increase the gap length between the inner peripheral surface of the stator and the outer peripheral surface of the rotor, as shown in FIG.
A stepped processing portion 108S1 that is a chamfered portion may be provided on the rear side of the claw-shaped magnetic pole 108 in the rotation direction. Details of the stepped processing portion will be described later with reference to FIG. A beveled portion 108B2 is provided on the front side of the claw-shaped magnetic pole 108 in the rotation direction.

Next, a specific example of the surface shape of the claw-shaped magnetic pole used in the AC generator according to this embodiment will be described with reference to FIGS. First, the overall configuration of the claw-shaped magnetic pole used in the AC generator according to the present embodiment will be described with reference to FIG. The configurations of the groove and the chamfer formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the present embodiment will be described with reference to FIGS. 13 to 15. 12
FIG. 3 is an external perspective view of a rotor used in the AC generator according to the first embodiment of the present invention. FIG. 13 is an enlarged cross-sectional view of the groove portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. FIG. 14 is an enlarged cross-sectional view of a beveled portion, which is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. FIG. 15 is an enlarged cross-sectional view of a stepped processing portion that is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts.

As shown in FIG. 12, adjacent claw-shaped magnetic poles 1
Between 08S and the claw-shaped magnetic pole 108N, a permanent magnet holder 118 with a permanent magnet 117 inserted therein is disposed. In this case, the magnet holder 118b is fixed to the notch of the claw-shaped magnetic pole 108. On the surface of the claw-shaped magnetic pole 108, when the rotation direction of the rotor is the arrow R direction, a large beveled portion 108B1 is provided on the rear side of the rotation direction. Further, a slight bevel processing portion 108B2 is provided on the front side in the rotation direction.
Further, a groove 108G is formed on the surface of the claw-shaped magnetic pole 108. A plurality of grooves 108G are formed parallel to the rotation direction R of the rotor.

The width W10 of the beveled portion (magnetization side bevel) 108B1 provided on the rear side in the rotational direction is related to the number of phases of the generator. For example, in the case of three phases, the claw-shaped magnetic pole width Wps.
Is about 1/6 to 1/3. The reason for having a range of 1/6 to 1/3 is that it varies depending on the rotation speed, and is a value close to 1/6 on average. In this example, the width W10 is set to 5 mm due to the strength of the magnet fixing portion. Further, the width W20 of the beveled portion (demagnetization side bevel) 108B2 is
It is about 2.5 mm.

Next, the shape of the groove 108G arranged on the surface of the claw-shaped magnetic pole 108 will be described with reference to FIG. The groove depth h is largely related to the penetration frequency of the magnetic field calculated from the rotation frequency of the rotor and the conductivity of the rotor. When the magnetic field penetration depth at the maximum rotation speed of the actual machine was calculated, the depth was 0.6.
It was found that 5 mm was required. However, since it is difficult to cut the deep groove, it is preferable to use a threading machine or a lathe to machine about 0.5 mm as a structure suitable for mass production. The cutting edge angle α of the cutting tool used is 60
The groove shape is about 70 degrees, and the groove has a sawtooth shape. The width t1 of the convex portion and the width t2 of the concave portion of the uneven portion fluctuate depending on the groove pitch p during cutting and the wear of the cutting edge of the cutting tool during machining, etc. If the depth is 0.5 mm and the width t2 of the groove bottom is 0.05 mm, the width t1 of the groove top is 0.57 m.
It will be about m. Further, when the cutting edge angle α of the cutting tool is 70 degrees, t1 is 0.47 mm. When the groove 108G is processed with a cutting tool using a thread cutting machine, no groove is provided in the stepped portions 124 at both ends of the claw-shaped magnetic pole 108, so workability is improved in feeding the cutting tool for groove formation. Can be improved.

When a laser is used as another groove processing means, the groove depth can be increased and the groove width can be decreased, so that the effect of reducing the eddy current is further increased. In this example, in order to reduce the iron loss of the stator, a relatively thin layer of 0.
35t of SPCC material was used.

Next, the chamfered portion (bevel processing portion 108B1, bevel processing portion 108B2) of the surface of the claw-shaped magnetic pole will be described. The chamfer adopted this time is for reducing the overall level of fluctuation of the magnetic flux density on the surface of the claw, so it is effective to apply it on the magnetizing side (the rear side in the rotational direction). From the analysis result by the magnetic field analysis, it was found that the magnetic flux density was concentrated especially from about 5 mm from the edge. Since the claw-shaped magnetic pole width Wps of this example is 28 mm, the width W10 of the chamfered portion is
Is about 18% when expressed as a ratio with the claw-shaped magnetic pole width Wps.

The beveling portion 108B2 on the demagnetization side (the front side in the rotation direction) may have a deburring radius, so that the demagnetization side bevel width W20 may be about 1 to 2 mm. By setting this degree, the magnetic flux densities in the vicinity of the central portion in the rotation direction can be made equal.

Further, the beveled portion 108B1 of the rotating rear side magnetizing portion of the rotor shown in FIG. 14 is provided with a bevel width w10 of a portion corresponding to the magnetizing side at a constant angle. The angle β of the beveled portion 108B1 was found to be appropriate to be about 20 degrees by calculation using the magnetic field calculation and also considering the output current. With this angle, a decrease in output current can be reduced. In this case, the magnet fixing portion thickness H1 needs to be about 2.5 mm.

Further, the height H2 of the stepped processed portion 108S1 of the rotating rear side magnetizing portion of the rotor shown in FIG. 15 is 1.0 mm calculated by using the magnetic field calculation and also considering the output current.
The degree was found to be appropriate. At this height,
The decrease in output current can be reduced. in this case,
The magnet fixing portion thickness H1 needs to be about 2.5 mm.

Further, as shown in FIG. 12, three positioning holes 130 are arranged on the pulley side core side surface of the rotor. By providing the positioning hole 130 on the pulley side, it can be easily incorporated in the magnetizing jig.

Next, the eddy current loss in the AC generator according to the present embodiment will be described with reference to FIGS. 16 and 17. 16 and 17 are explanatory diagrams of eddy current loss in the AC generator according to the first embodiment of the present invention.

FIG. 16 shows a case where a chamfered portion is provided on the magnetized side of the surface of the claw-shaped magnetic pole and a groove is provided on the surface of another claw-shaped magnetic pole (solid line J2), and the surface of the claw-shaped magnetic pole is uniform. The figure shows a comparison of eddy current loss when a groove is provided (solid line J1). The horizontal axis of FIG. 16 represents the depth of the groove, and the vertical axis represents the magnitude of eddy current loss.

As shown in FIG. 16, eddy current loss can be reduced when the chamfered portion is provided on the magnetized side and a groove is further provided at the same groove depth. In other words, when the eddy current loss is set to a certain value,
Since the depth of the groove can be made shallow, the work process in manufacturing can be reduced.

In FIG. 17, when the groove pitch is plotted on the horizontal axis and the eddy current loss is plotted on the vertical axis, a chamfered portion is provided on the surface of the claw-shaped magnetic pole on the increasing side, and the surface portions of the other claw-shaped magnetic poles are provided. The figure shows a comparison of eddy current loss when a groove is provided (solid line K2) and when a uniform groove is provided on the claw-shaped magnetic pole surface (solid line K1). When the same eddy current loss is used, the groove pitch can be made wider when the chamfered portion is provided on the magnetized side. Therefore,
Since the number of grooves arranged on the surface of the claw-shaped magnetic pole is reduced, the time required for the processing step can be shortened and the cost can be reduced.

Next, the method of magnetizing the permanent magnets used in the rotor of the AC generator according to this embodiment will be described with reference to FIGS. 18 and 19. FIG. 18 is an external perspective view of a permanent magnet magnetizing jig used for the rotor of the AC generator according to the first embodiment of the present invention. FIG. 19 is a plan view of a magnetizing magnetic pole used in a magnetizing jig for a permanent magnet used in the rotor of the AC generator according to the first embodiment of the present invention.

The external magnetizing jig 140 shown in FIG. 18 is a jig for magnetizing the permanent magnet 117 arranged on the rotor shown in FIG. Conventionally, the already magnetized permanent magnet was attached inside the claw-shaped magnetic pole of the rotor, whereas in the present embodiment, after attaching the unmagnetized neodymium magnet inside the claw-shaped magnetic pole, By magnetizing with the external magnetizing jig 140, the productivity is improved.

The external magnetizing jig 140 is a magnetizing magnetic pole 132 for the S pole and a magnetizing jig 13 for the N pole which overlap the claw-shaped magnetic poles of the rotor.
3 and a resin 134 excellent in heat conduction for integrally molding a magnetizing coil (not shown) on the outer peripheral side of the magnet 3 and the magnetizing coil 3 are formed in a substantially cylindrical shape. A housing (not shown) is provided on the outer peripheral portion of the housing, and a water passage for cooling the magnetizing coil is formed inside the housing. Magnetized magnetic pole 1
32 and 133 are made of laminated steel plates so that the eddy current loss is reduced.

The rotor is shown in FIG. 18 in the state shown in FIG.
It is inserted into the magnetizing jig 140 shown in FIG. The shaft of the rotor is inserted into the shaft hole 135 and positioned by the convex portion 131 for alignment of the external magnetizing jig 140 and the alignment hole 130 provided in the rotor. At this time,
The gap between the rotor and the magnetic pole of the magnetizing jig is 0.05 mm to 0.
It is about 2 mm. Although not shown, the magnetizing coil wound around the S pole magnetizing magnetic pole and the magnetizing coil around the N pole magnetizing magnetic pole are connected in series so that the same magnetomotive force is generated in all the magnetic poles. I am doing it.

Next, referring to FIG. 19, the magnetizing magnetic poles 132,
133 will be described. The magnetizing magnetic poles 132 and 133 arranged in the magnetizing jig have substantially the same shape as the claw-shaped magnetic pole of the rotor, but the surface area of the magnetizing magnetic pole is larger. If the gap ws between the S-pole magnetizing magnetic pole 132 and the N-pole magnetizing magnetic pole 133 of the magnetizing jig is narrowed, the magnetic flux does not enter the rotor during magnetizing, and the magnetizing magnetic poles are short-circuited, so that the optimum width is obtained. Exists. In this example, the gap ws between the magnetizing magnetic poles needs to be equal to or larger than the thickness of the magnetizing coil in manufacturing, and is required to be 20 times or more the gap between the magnetizing magnetic pole and the rotor at the time of magnetizing described above. .5
mm. Further, the magnetic pole width Wp2 at the magnetic center position of the magnetized magnetic pole and the width Wps of the magnetic center position of the claw-shaped magnetic pole of the rotor.
In No. 2, two conditions are satisfied with Wp2> Wps2. The voltage applied to the magnetizing coil of the magnetizing jig 140 is approximately 3 kV to 4 kV, and a current is passed in a short time after charging the capacitor to magnetize it.

As described above, in the present embodiment, in the vehicle AC generator in which the neodymium permanent magnet is disposed between the claw-shaped magnetic poles in the liquid cooling type and the housing structure is almost hermetically sealed, the conventional groove machining is performed. In addition, it is possible to significantly reduce the eddy current loss by reducing the magnetic flux density on the magnetized side. That is, by providing a chamfered portion at the claw-shaped magnetic pole portion where the magnetic flux density locally increases, the gap length is expanded to reduce the concentration of the magnetic flux density, and grooves are provided at other locations to generate eddy current loss. Can be suppressed. In the case of three phases, the portion where the magnetic flux is concentrated is about ⅓ (about the slot pitch) of the maximum width of one pole of the rotor. In the conventional example, the rotor was provided with a groove at a constant depth, but there is no improvement in heat generation due to eddy current loss in the portion corresponding to the rotation rear side of the rotor where the magnetic flux density is concentrated. In the present embodiment, in order to reduce the magnetic flux density at the rear part of the claw edge of the rotor where the magnetic flux density of the claw-shaped magnetic pole becomes high, the gap is set to a width of about one slot pitch of the stator magnetic pole. By widening it, heat generation due to eddy current loss can be suppressed.

Further, in order to reduce the number of man-hours at the time of processing and improve the output, stepped portions are provided on the outer diameter portions of both ends in the axial direction of the rotor, which are smaller than the overlapping surface of the rotor and the stator core. As a result, the cutting tool can prevent this portion from being processed, so that the cutting area can be reduced. Further, by providing the stepped portion during the groove processing, it is possible to reduce the load fluctuation applied to the cutting tool, and it is possible to extend the life of the tool. Also, by providing a stepped portion, it is possible to reduce the inductance of the stator winding by making it difficult for the magnetic flux when current flows in the end portion of the stator winding to interlink with the rotor. I have to.

Further, in the final stage of assembling the rotor, by magnetizing it with a magnetizing jig, problems such as post-processing are eliminated, and chips and the like are not attached, so that the reliability of the rotor is improved.

According to this embodiment, it is possible to reduce the eddy current loss generated on the surface of the claw-shaped magnetic poles and prevent thermal demagnetization of the permanent magnets arranged between the claw-shaped magnetic poles.

Next, the configuration of the AC generator according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 20 is a cross-sectional view showing the configuration of the main parts of the AC generator according to the second embodiment of the present invention. FIG. 21 corresponds to FIG.
It is a principal part enlarged view of 0.

The main part of the AC generator according to this embodiment shown in FIG. 20 corresponds to the structure shown in FIG.
In the configuration shown in FIG. 6, the gap between the inner peripheral side of the stator 102 and the outer peripheral side of the rotor 100 was constant. On the other hand, in the embodiment shown in FIG. 20, the claw-shaped magnetic pole 108
The outer peripheral side of T (the surface facing the inner peripheral side of the stator) has a circular arc shape with a convex center when viewed in the direction of the rotation axis of the rotor. That is, the inner peripheral side of the stator 102 and the rotor 10
The outer peripheral side of 0, that is, the gap between the surfaces of the claw-shaped magnetic pole 108T is g2 = g3, where g1 is the central gap and g2 and g3 are the gaps on both ends, and g1 <g2. , G3. Also, FIG.
As shown in FIG. 1, a plurality of grooves 108M parallel to the rotation direction of the rotor are formed on the surface of the claw-shaped magnetic pole 108T. The depth of the groove is D2 = D3, where D1 is the depth of the groove at the center and D2 and D3 are the depths of the grooves at both ends.
And D1> D2 and D3.

As described above, by making the gaps g2 and g3 at both ends in the axial direction larger than the gap g1 at the central part, the cooling efficiency at both axial ends of the rotor can be improved. Also, the groove depth D1 in the central portion
By making the groove depth deeper than the groove depths D2 and D3 at both ends, heat generation in the central portion can be suppressed. as a result,
The thermal demagnetization of the permanent magnet can be reduced.

According to this embodiment, the eddy current loss generated on the surface of the claw-shaped magnetic poles can be reduced, and the thermal demagnetization of the permanent magnet arranged between the claw-shaped magnetic poles can be further reduced.

Next, the configuration of the AC generator according to the third embodiment of the present invention will be described with reference to FIG. Figure 2
FIG. 2 is a sectional view showing the overall configuration of an AC generator according to the third embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts.

The AC generator 1A according to this embodiment is shown in FIG.
Similarly to the liquid-cooled vehicle AC generator shown in FIG. 2, the internal fan fan 125 is arranged on the end surface of the rotor 100 on the side opposite to the pulley, although the liquid-cooled type AC generator. In addition, the front bracket 1 allows the inner fan fan 125 to circulate the air inside the machine.
A ventilation port 123 is provided on 04F, and the housing 115
Has a ventilation opening 121 on the bottom surface and a ventilation opening 122 on the rear bracket 104R. Other configurations are similar to those in FIG.

As described above, when the inner fan fan 125 is provided, the temperature inside the machine is lowered by about 10 to 20 ° C., but as described above, a groove is provided on the magnetizing side bevel and the other surface to prevent eddy current. By doing so, the temperature of the permanent magnet arranged between the claw-shaped magnetic poles can be reduced. Another effect is to reduce the magnetic excitation force by providing a bevel on the magnetizing side. Also, in the groove machining operation, by increasing the bevel width and cutting from the magnetizing side bevel, it is possible to reduce the load fluctuation of the cutting tool, so that the life of the cutting tool can be extended. Further, since the eddy current loss is reduced, the power generation efficiency is also improved.

According to this embodiment, it is possible to reduce the eddy current loss generated on the surface of the claw-shaped magnetic poles and further reduce the thermal demagnetization of the permanent magnets arranged between the claw-shaped magnetic poles.

Next, the configuration of the AC generator according to the fourth embodiment of the present invention will be described with reference to FIG. Figure 2
FIG. 3 is a sectional view showing the overall configuration of an AC generator according to a fourth embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts.

The basic structure of the AC generator according to this embodiment is the same as that of the liquid-cooled vehicle AC generator shown in FIG. In this embodiment, the magnetic ring 150 is arranged on the axial extension of the stator core 115. The outer peripheral surface of the magnetic body ring 150 is arranged so as to be flush with the outer peripheral surface of the stator core 115.

The magnetic material ring 150 prevents the leakage magnetic flux from the coil end from interlinking with the housing 115 and generating an eddy current loss. The magnetic flux at the coil end can be collected by the magnetic ring newly arranged this time, and the leakage magnetic flux can be used as an effective magnetic flux. Further, the heat generated by the stator winding 106 can be efficiently transmitted to the housing 115. The magnetic ring 150 to be arranged is preferably a stack of thin rings axially stacked. The reason for this is that the eddy current can be reduced.

According to this embodiment, the eddy current loss generated on the surface of the claw-shaped magnetic pole can be reduced, and the thermal demagnetization of the permanent magnet arranged between the claw-shaped magnetic poles can be further reduced.

Next, an AC generator according to the fifth embodiment of the present invention will be described with reference to FIGS. 24 to 26. The overall configuration of the AC generator of this embodiment is the same as that shown in FIG.

The overall structure of the claw-shaped magnetic pole used in the AC generator according to the present embodiment will be described below with reference to FIG. The configurations of the groove and the chamfer formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the present embodiment will be described with reference to FIGS. 25 and 26. FIG. 24 is an external perspective view of a rotor used in the AC generator according to the fifth embodiment of the present invention. FIG. 25 is an enlarged cross-sectional view of a beveled portion which is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the fifth embodiment of the present invention. FIG. 26
FIG. 13 is an enlarged cross-sectional view of a stepped portion that is a chamfered portion formed on the surface of a claw-shaped magnetic pole used in the AC generator according to the fifth embodiment of the present invention. The same reference numerals as those in FIGS. 1, 12, 14, and 15 denote the same parts.

In the present embodiment, the groove 108G 'is formed up to the position shown by the dotted line in FIGS. That is, the increased magnetic chamfered portion (bevel processing portion 108B in FIG. 25).
1, the step 108 S1) in FIG.
G'is provided.

As shown in FIGS. 25 and 26, by arranging the groove 108G 'also on the magnetizing side bevel portion (chamfered portion),
A further effect of reducing the eddy current can be obtained. Further, since the temperature rise of the permanent magnets arranged between the claw-shaped magnetic poles can be reduced, the operating temperature of the permanent magnets is lowered, thereby further improving the output current. Further, since the temperature can be made lower than that of the conventional rotor, it is possible to improve the number of rotations and downsize. Further, if a powder iron core or the like in which magnetic powder is hardened with an insulator is used as the material of the rotor, a further effect of reducing the eddy current can be expected.

In the book, H1 = 2.0 in the case shown in FIG.
mm, β = 5 degrees, Wps = 28.0 mm, W10 = 5 m
m and W20 = 2 mm. In the case of the claw-shaped magnetic pole shown in FIG. 26, H1 = 1.5 mm, H2 = 0.3 m
m, and other dimensions are the same as those in FIG.

According to this embodiment, the eddy current loss generated on the surface of the claw-shaped magnetic poles can be reduced, and the thermal demagnetization of the permanent magnet arranged between the claw-shaped magnetic poles can be further reduced.

[0091]

According to the present invention, the thermal demagnetization of the permanent magnet arranged between the claw-shaped magnetic poles can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of an AC generator according to a first embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

3 shows a view of the rotor 1 as seen from the axial direction, and is an enlarged cross-sectional view of the main parts of FIG.

FIG. 4 is a side view for explaining dimensions of a claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 5 is a side view for explaining dimensions of a claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 6 is a front cross-sectional view showing the structure of a stepped portion of a claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 7 is an explanatory view of a permanent magnet holder for fixing a permanent magnet used in the AC generator according to the first embodiment of the present invention, and is a cross-sectional view of a magnetic center position with respect to an axial direction (X direction) of the rotor. is there.

FIG. 8 is a perspective view of a permanent magnet holder used in the AC generator according to the first embodiment of the present invention.

FIG. 9 is a schematic plan view of a claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention seen from above, and a cross-sectional view taken along the line aa ′.

10A is another example of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention seen from above, FIG.
It is a-a 'sectional view.

FIG. 11 is an explanatory diagram of a magnetic flux density used in the AC generator according to the first embodiment of the present invention.

FIG. 12 is an external perspective view of a rotor used for the AC generator according to the first embodiment of the present invention.

FIG. 13 is an enlarged cross-sectional view of a groove formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 14 is an enlarged cross-sectional view of a beveled portion which is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 15 is an enlarged cross-sectional view of a stepped processing portion that is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the first embodiment of the present invention.

FIG. 16 is an explanatory diagram of eddy current loss in the AC generator according to the first embodiment of the present invention.

FIG. 17 is an explanatory diagram of eddy current loss in the AC generator according to the first embodiment of the present invention.

FIG. 18 is an external perspective view of a permanent magnet magnetizing jig used for the rotor of the AC generator according to the first embodiment of the present invention.

FIG. 19 is a plan view of a magnetizing magnetic pole used in a magnetizing jig for a permanent magnet used in the rotor of the AC generator according to the first embodiment of the present invention.

FIG. 20 is a sectional view showing a configuration of a main part of an AC generator according to a second embodiment of the present invention.

FIG. 21 is an enlarged view of a main part of FIG.

FIG. 22 is a sectional view showing the overall structure of an AC generator according to a third embodiment of the present invention.

FIG. 23 is a sectional view showing the overall structure of an AC generator according to a fourth embodiment of the present invention.

FIG. 24 is an external perspective view of a rotor used in the AC generator according to the fifth embodiment of the present invention.

FIG. 25 is an enlarged cross-sectional view of a beveled portion, which is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the fifth embodiment of the present invention.

FIG. 26 is an enlarged cross-sectional view of a stepped processing portion that is a chamfered portion formed on the surface of the claw-shaped magnetic pole used in the AC generator according to the fifth embodiment of the present invention.

[Explanation of symbols] 1 ... AC generator for liquid-cooled vehicles 100 ... rotor 101 ... Shaft 102 ... Stator 2 ... pulley 104F ... Front bracket 104R ... Rear bracket 105 ... Stator core 106 ... Stator winding 107 ... Field winding 108 ... Claw-shaped magnetic pole 108B1, 108B2 ... Bevel processing part 108S1 ... Stepped portion 108G ... groove 109A ... Diode plus fin 109B ... Diode minus fin 110 ... slip ring 111 ... Brush 112 ... Rear plate 113 ... IC regulator 114 ... Waterway 115 ... Housing 116 ... Good thermal conductor 117 ... Permanent magnet 118 ... Permanent magnet holder 119 ... Magnet fixing part 120 ... Waterway 121-123 ... Ventilation port 124 ... Stepped portion 125 ... Uchifan fan 130 ... Alignment hole 131 ... Rotor positioning projection 132 ... Magnetizing magnetic pole for S pole 133 ... Magnetized magnetic pole for N pole 134 ... Resin 135 ... Shaft hole 140 ... Magnetizing jig 150 ... Magnetic ring

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 15/03 H02K 15/03 H 19/22 19/22 (72) Inventor Kenji Miyata Omika, Hitachi City, Ibaraki Prefecture Machi 7-chome 1-1 Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Susumu Terumoto 2520, Takaba, Hitachinaka City, Ibaraki Prefecture Hitachi Ltd. Automotive Equipment Group (72) Inventor Shinji Kigawa Ibaraki 2477 Takaba, Hitachinaka City, Japan F-Term in Hitachi Car Engineering Co., Ltd. (Reference) 5H002 AA02 AA05 AA09 AA10 AB05 AB08 AC06 AC08 AD05 AD08 AE02 AE07 5H605 AA01 AA05 BB03 BB11 BB17 CC01 CC02 DD05 DD09 DD13 EB10 BB13 FB12 BB12 CB12 BB12 BB19 PP02 PP06 PP07 PP08 PP09 PP16 QQ02 QQ04 QQ11 QQ12 QQ23 RR27 RR36 RR37 RR42 RR43 RR69 RR73 SS12 5H619 AA01 AA08 BB02 BB06 BB17 PP01 PP02 PP04 PP08 PP10 PP32 PP33 5H622 AA03 AA06 CA02 CA07 CA10 CB03 CB04 CB05 DD02 PP03 PP07 PP10 PP16 QA08 QB03 QB09

Claims (15)

[Claims] 1. A pair of opposed claw-shaped magnetic poles having a plurality of claws formed at a tip portion thereof, a field winding for magnetizing the claw-shaped magnetic poles, and a claw-shaped magnetic pole disposed between the claw-shaped magnetic poles. A stator having a rotor composed of a neodymium permanent magnet for auxiliary excitation, and a stator winding arranged at a predetermined distance from the rotor and generating an AC voltage by magnetization of the claw-shaped magnetic poles. And a water channel in which cooling water circulates in the outer peripheral portion of the stator, wherein a plurality of grooves formed in parallel with the rotation direction of the rotor are provided on the surface of the claw-shaped magnetic pole. An alternator for vehicles, which is characterized by 2. The vehicle AC generator according to claim 1, wherein the surface of the claw-shaped magnetic pole is formed on the rear side with respect to the rotation direction of the claw-shaped magnetic pole, and the inner peripheral surface of the stator is formed. An alternator for a vehicle, comprising: a chamfered portion that widens a gap length between the surface of the claw-shaped magnetic pole and the claw-shaped magnetic pole. 3. The vehicular AC generator according to claim 2, wherein the chamfered portion is a beveled portion having a shape in which the rear side is shaved off at a predetermined angle with respect to the rotation direction of the claw-shaped magnetic pole. Characteristic vehicle alternator. 4. The vehicle alternator according to claim 2, wherein the chamfered portion is a stepped portion having a stepped shape on the rear side with respect to the rotation direction of the claw-shaped magnetic pole. AC generator for vehicles. 5. The vehicular AC generator according to claim 2, wherein the groove formed on the surface of the claw-shaped magnetic pole is formed on the surface of the chamfered portion, and the groove formed on the chamfered portion. The vehicle alternator is characterized in that the depth is shallower than the groove depth formed in the claw-shaped magnetic pole other than the chamfered portion. 6. The vehicle alternator according to claim 2, wherein the chamfered portion is formed parallel to a skew angle of the claw-shaped magnetic pole. 7. The vehicular AC generator according to claim 2, wherein the surface of the claw-shaped magnetic pole is formed on the front side with respect to the rotation direction of the claw-shaped magnetic pole, and the inner peripheral surface of the stator is formed. An alternator for a vehicle, comprising a beveled portion that widens a gap length between the surfaces of the claw-shaped magnetic poles. 8. The vehicle alternator according to claim 7, wherein a width W1 of the chamfered portion is wider than a width W2 of the beveled portion. 9. The vehicle alternator according to claim 1, wherein the outer diameter of a portion of the claw-shaped magnetic pole that is provided on both outer peripheral surfaces in the axial direction of the claw-shaped magnetic pole and that faces the stator winding faces the stator. An alternator for vehicles, which is provided with a stepped portion that is smaller than the above. 10. The vehicular AC generator according to claim 1, wherein the claw-shaped magnetic pole is provided with a magnet fixing portion for preventing the neodymium permanent magnet arranged between the claw-shaped magnetic poles from protruding. The width L1 of the fixed portion is in the range of 1.0 to 2.5 mm, the thickness H1 is 1.0 to 2.5 mm, and the magnetizing direction length L3 is 10 mm or less.
An alternating current generator for a vehicle, wherein the neodymium magnet and the claw-shaped magnetic pole are arranged so as to be in direct contact with each other. 11. The vehicular AC generator according to claim 1, further comprising a magnetic ring that extends the stator in the axial direction, and the outer peripheral surface of the magnetic ring is substantially the same as the outer peripheral surface of the stator core. An alternator for vehicles, characterized in that 12. The vehicle alternator according to claim 1, further comprising a magnetizing alignment hole provided on an end surface of the claw-shaped magnetic pole on the pulley side. . 13. The vehicle alternator according to claim 1, further comprising a housing covering the entire circumference of the rotor so that the rotor has a closed structure. 14. A pair of opposed claw-shaped magnetic poles having a plurality of claws formed at the tip, field windings for magnetizing the claw-shaped magnetic poles, and a pair of claw-shaped magnetic poles arranged between the claw-shaped magnetic poles. A stator having a rotor composed of a neodymium permanent magnet for auxiliary excitation, and a stator winding arranged at a predetermined distance from the rotor and generating an AC voltage by magnetization of the claw-shaped magnetic poles. And a method for manufacturing a vehicle alternator having a water channel in which cooling water circulates on the outer peripheral portion of the stator, wherein the permanent magnets are magnetized before the assembly step of inserting the rotor into the stator, A method of manufacturing an AC generator for a liquid-cooled vehicle, which comprises magnetizing using a magnetizing jig having a magnetizing yoke that is substantially similar to a rotor magnetic pole, and then incorporating the magnet into a stator. 15. The method for manufacturing a vehicle AC generator according to claim 14, wherein the magnetizing yoke of the magnetizing jig is configured to be wider than the width of the magnetized claw-shaped magnetic pole. The width Ws between the magnetic poles of the magnetic yoke is 20 times the gap between the rotor and the magnetic yoke when magnetized.
A method for manufacturing a vehicle alternator, characterized in that the number is more than doubled.