CN106877606B - Automotive alternating-current generator - Google Patents
Automotive alternating-current generator Download PDFInfo
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- CN106877606B CN106877606B CN201710293448.0A CN201710293448A CN106877606B CN 106877606 B CN106877606 B CN 106877606B CN 201710293448 A CN201710293448 A CN 201710293448A CN 106877606 B CN106877606 B CN 106877606B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/42—Asynchronous induction generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention discloses an automotive alternating current generator, and relates to the technical field of generators. The motor comprises a front end cover, a rear end cover, a rotor and a stator, wherein the rotor and the stator are fixed between the front end cover and the rear end cover; the ratio of the distance L2 from the front end surface of the stator core to the inner side of the front pole claw bottom plate to the thickness L1 of the front pole claw bottom plate is as follows: L2/L1 is less than or equal to 0.19; the ratio of the distance Lp from the tip of the front pole claw to the front end face of the stator core to the height L3 of the stator core is: lp/L3 is more than or equal to 0.91. The invention increases the induced electromotive force of the alternating current generator, improves the output power of the generator and improves the electric energy conversion efficiency; the alternator has better power density under the same diameter, which is beneficial to reducing the volume of the alternator.
Description
Technical Field
The invention relates to the technical field of generators, in particular to an automotive alternating-current generator.
Background
In automobiles, the alternator functions to convert part of the mechanical energy of the engine into electrical energy, thereby powering the electrical equipment or batteries of the automobile. The existing automotive alternating current generator generally comprises end covers, rotors, stators, belt pulleys, rectifier bridges and other parts, and in the running process, the generator is easy to cause large copper loss, large noise and serious magnetic leakage due to unreasonable design of the generator (such as stator structures, rotor and stator fit clearances and the like), so that the energy conversion rate and the power generation power of the generator are greatly reduced, and the output performance of the generator is influenced. For the above reasons, the conventional automotive ac generator generally adopts a large-sized structural design to ensure the electricity consumption requirement of the automobile, however, with the current development trend of miniaturization and light weight of the automobile, the ac generator with low output power and large volume cannot meet the requirement of users.
Disclosure of Invention
Based on the above, the invention provides an automotive alternating current generator to solve the problems of low power generation efficiency, small output power, large volume and large wind noise of the existing alternating current generator.
To achieve the purpose, the invention adopts the following technical scheme:
an automotive alternating current generator comprises a front end cover, a rear end cover, a rotor and a stator, wherein the rotor and the stator are fixed between the front end cover and the rear end cover, the rotor comprises front pole claws and rear pole claws which are installed in a crossing manner, and the stator comprises a stator iron core and a stator coil wound on the stator iron core; the ratio of the distance L2 from the front end surface of the stator core to the inner side of the front pole claw bottom plate to the thickness L1 of the front pole claw bottom plate is as follows: L2/L1 is less than or equal to 0.19; the ratio of the distance Lp from the claw tip of the front pole claw to the front end surface of the stator core to the height L3 of the stator core is as follows: lp/L3 is more than or equal to 0.91.
Preferably, the ratio of the distance L2 'from the rear end surface of the stator core to the inner side of the rear pole claw bottom plate to the thickness L1' of the rear pole claw bottom plate is: the ratio of the distance Lp' from the claw tip of the rear pole claw to the rear end surface of the stator core to the height L3 of the stator core is less than or equal to 0.19: lp'/L3 is more than or equal to 0.91.
Preferably, the ratio of the thickness X1 of the front pole claw heel to the thickness L1 of the front pole claw bottom plate is: X1/L1 is more than or equal to 0.91 and less than or equal to 1.2; and/or the ratio of the thickness X1 'of the rear pole claw heel to the thickness L1' of the rear pole claw bottom plate is: x1 '/L1'. Ltoreq.1.2 is more than or equal to 0.91.
Preferably, the ratio of the thickness X2 of the front pole claw tip to the thickness X1 of the front pole claw heel is: X2/X1 is more than or equal to 0.26 and less than or equal to 0.5; and/or the ratio of the thickness X2 'of the trailing pole claw tip to the thickness X1' of the trailing pole claw heel is: x2 '/X1'. Ltoreq.0.26 is not more than 0.5.
Preferably, the claw tips of the front and rear electrode claws are respectively provided with a claw tip chamfering circle, the claw tip chamfering circle is formed by extrusion of a cold extrusion groove formed in a die, and the radius R of the claw tip chamfering circle has the following value: r is more than or equal to 2mm.
Preferably, the ratio of the circumferential distance Y from the front pole claw to the rear pole claw to the tooth width X of the stator core is: Y/X is more than or equal to 1.5 and less than or equal to 1.99.
Preferably, the ratio of the width bt in the teeth of the stator core to the height ht of the core slot is: and bt/ht is more than or equal to 0.3 and less than or equal to 0.39.
Preferably, a front fan is installed at the front end of the rotor, and the ratio of the distance t from the top of the fan blade of the front fan to the front end of the stator coil to the height h of the fan blade of the front fan is: t/h is less than or equal to 0.19; and/or a rear fan is arranged at the rear end of the rotor, and the ratio of the distance t 'from the top of the fan blade of the rear fan to the rear end of the stator coil to the height h' of the fan blade of the rear fan is as follows: t '/h'. Ltoreq.0.19.
Preferably, the roots of the front pole claw and the rear pole claw are respectively provided with a wind cutting chamfer, and the wind cutting chamfer is a plane.
The beneficial effects of the invention are as follows:
according to the invention, the size and the proportion relation between the stator iron core and the pole claw are adjusted, so that the induced electromotive force of the alternating current generator is effectively increased, the output power of the generator is improved, and the electric energy conversion efficiency is improved; meanwhile, the arrangement ensures that the alternating current generator has optimal power density under the same diameter, maximizes the induced electromotive force under the condition of ensuring the mechanical strength of the pole claw, achieves optimal output and efficiency, and is beneficial to reducing the volume of the generator. The matching arrangement of the proportions ensures the best magnetic field saturation degree of the rotor and the stator core, and simultaneously takes account of factors such as mechanical strength, wind noise and the like of the rotor, so that the generator has high output, and simultaneously has lower noise, better mechanical strength, higher power generation efficiency, small vibration and stable work; furthermore, on the basis of equal output, the invention effectively reduces the volume of the generator and saves the production cost and the space in the vehicle.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is an exploded view of an alternator for a vehicle according to the present invention;
FIG. 2 is a cross-sectional view of the internal structure of the automotive alternator provided by the present invention;
fig. 3 is a mounting structure view of a rotor according to the present invention;
FIG. 4 is a block diagram of the front pole grip of the present invention;
FIG. 5 is another angular block diagram of the front pole grip of the present invention;
FIG. 6 is a cross-sectional view of a front pole grip according to the present invention;
FIG. 7 is a cross-sectional view of a trailing pole grip according to the present invention;
fig. 8 is a partial structural view of a stator core slot according to the present invention;
fig. 9 is a structural view of teeth of a stator core according to the present invention;
fig. 10 is a graph of electromagnetic noise of an alternator for a vehicle.
In the figure:
11-a front end cap; 12-a rear end cap; 21-a front pole claw; 211-a bottom plate; 212-claw parts; 213-front yoke; 214-wind cutting chamfering; 22-a rear pole claw; 23-rotor coils; 24-rotor shaft; 31-stator core; 32-stator coils; 4-a pulley; 5-rectifying bridge; 6-cover cap; 71-a front fan; 72-a rear fan;
s1, S3 are electromagnetic noise curves of the automotive alternating current generator in the prior art;
s2 is the electromagnetic noise curve of the automotive alternator of the present invention.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
As shown in fig. 1 to 10, the present embodiment provides a preferred automotive alternator including a front end cover 11, a rear end cover 12, and a rotor and a stator fixed between the front end cover 11 and the rear end cover 12, wherein the rotor is fixed on a rotor shaft 24, and the stator is mounted outside the rotor. Specifically, the rotor includes a front pole claw 21 and a rear pole claw 22 which are installed to cross each other, and are used for conducting magnetic conduction and radiating heat; a coil former is provided between the front pole claw 21 and the rear pole claw 22, and a rotor coil 23 is wound on the coil former for generating excitation after the direct current is applied. The stator includes a stator core 31 and a stator coil 32 wound around the stator core 31; the stator core 31 is used for magnetic conduction and heat dissipation, and the stator coil 32 is used for generating alternating current in a changing magnetic field. The front end of the alternating current generator is connected with an engine of an automobile through a belt pulley 4, and can convert kinetic energy of the engine into electric energy; the rear end of the generator is connected with the rectifier bridge 5 and the regulator and is used for conveying stable electric energy to electric equipment in the vehicle; the rear end of the generator is also covered with a cover cap 6 for protection.
In the present invention, as shown in fig. 4 and 5, the front pole claw 21 includes a bottom plate 211 and a plurality of claw portions 212 uniformly provided on the bottom plate 211; the structure of the rear pole claw 22 is the same as that of the front pole claw 21, and the description thereof is omitted herein; the front pole claw 21 and the back pole claw 22 are also provided with a magnetic yoke, the magnetic yoke can be an independent structure and is arranged between the front bottom plate and the back bottom plate, or can be an integrated structure with the bottom plates of the front pole claw 21 and/or the back pole claw 22, in this embodiment, the magnetic yoke and the pole claw are preferably integrally manufactured, namely, the front pole claw 21 is provided with a half of front magnetic yoke 213, the back pole claw 22 is provided with a half of back magnetic yoke, and the front half and the back half of magnetic yokes are butted to form the whole magnetic yoke when the rotor is arranged. Further, as shown in fig. 2 and 6, the ratio of the distance L2 from the front end surface of the stator core 31 to the inside of the bottom plate of the front pole claw 21 to the thickness L1 of the bottom plate of the front pole claw 21 is: L2/L1 is less than or equal to 0.19; meanwhile, in order to satisfy the symmetry of the generator structure and further optimize the generator performance, the ratio of the distance L2 'from the rear end face of the stator core 31 of the present embodiment to the inside of the bottom plate of the rear pole claw 22 to the thickness L1' of the bottom plate of the rear pole claw 22 is also set as: l2 '/L1'. Ltoreq.0.19. Specifically, the L2 and the L2 'are both 2.19 mm, and the L1' are both 12 mm, which effectively increases the induced electromotive force of the alternating current generator, thereby improving the output power of the generator and the electric energy conversion efficiency.
As shown in fig. 2, the ratio of the distance Lp from the tip of the front pole claw 21 to the front end surface of the stator core 31 to the height L3 of the stator core 31 is: lp/L3 is more than or equal to 0.91; meanwhile, the ratio of the distance Lp' from the tip of the trailing pole claw 22 to the trailing end face of the stator core 31 to the height L3 of the stator core 31 is also: lp'/L3 is more than or equal to 0.91. Specifically, lp and Lp' are 29.92 mm and L3 is 32.4 mm. The proposal ensures that the alternating current generator can have optimal power density under the same diameter, maximizes the induced electromotive force under the condition of ensuring the mechanical strength of the pole claw, maximizes the output and efficiency, and is beneficial to reducing the volume of the generator. Through the adjustment and the matching of the specific dimensions, the invention ensures the optimal magnetic field saturation degree of the rotor and the stator, and simultaneously takes account of factors such as mechanical strength, wind noise and the like of the rotor, so that the generator has high output, and simultaneously has lower noise, better mechanical strength and higher power generation efficiency; furthermore, on the basis of equal output, the invention ensures that the diameter size of the stator of the generator reaches 124.5 mm, thereby effectively reducing the volume of the generator and saving the production cost of the generator and the occupied space in the vehicle. In addition, the generator is optimally designed under the comprehensive consideration of various factors, wherein the size and the corresponding proportion of each part have a definite matching relationship; therefore, the invention is not the same-scale reduction of the generator with larger volume in the prior art, which can seriously affect the working efficiency of the generator.
In the present invention, the ratio of the number of phase turns Ns per slot of the stator coil 32 to the number of turns Nr of the rotor coil 23 is: 0.017.ltoreq.Ns/Nr.ltoreq.0.029, where the number of phase turns per slot Ns is the number of coil turns embedded in a single phase per slot in the designated sub-core 31. Specifically, the above-described stator coil 32 has 7 turns of the phase turns Ns per slot, 315 turns of the turns Nr of the rotor coil 23, and the ratio Ns/Nr of the both is 0.022. The arrangement of the ratio can lead the generator to achieve the optimal design of magnetic leakage coefficient and magnetic resistance on the premise of meeting the winding process, thereby greatly improving the output power of the generator.
Further, the stator core 31 of the present invention has a height L3 and a yoke height L4 Total (S) The ratio is as follows: 1 is less than or equal to L3/L4 Total (S) Not more than 1.24, wherein L4 Total (S) 26.54 mm. As shown in fig. 6 and 7, since the yoke and the pole claw are integrated in the present embodiment, the entire yoke is composed of the front yoke 213 on the front pole claw 21 and the back yoke on the back pole claw 22, wherein the front yoke 213 has a height of L4, the back yoke has a height of L4', and the sum of L4 and L4' is L4 Total (S) In view of the symmetrical structure, L4 and L4' are L4 respectively Total (S) /2. Further, the total height of the front and rear pole claws of the invention is Lr, and lr=l1+l4 Total (S) +l1', where the ratio of the height L3 of the stator core 31 to the total height Lr of the front and rear pole claws is: L3/Lr is more than or equal to 0.56 and less than or equal to 0.69, wherein Lr is 50.54 mm.
Further, the ratio of the copper wire diameter D of the stator coil 32 to the opening width W per slot of the stator core 31 is: 0.4< D/W <0.7, specifically, the copper wire diameter D of the stator coil 32 is 0.88 mm, the opening width W per slot of the stator core 31 is 1.77 mm, and the ratio D/W of both is 0.497. The invention ensures that the generator outputs better at high speed and low speed by adjusting the ratio, does not generate extreme phenomenon, and effectively reduces copper loss of the alternating current generator.
Preferably, in the present embodiment, the ratio of the yoke diameter D2 to the rotor diameter D1 is: D2/D1 is more than or equal to 0.55 and less than or equal to 0.62, wherein the diameter D2 of the magnetic yoke is 53.75 mm (namely the radius R2 of the magnetic yoke is 26.875 mm), and the diameter D1 of the rotor is 96 mm (namely the radius R1 of the rotor is 48 mm); here, after the rotor diameter is determined, the diameter of the stator to which it is fitted is also substantially determined, thereby obtaining the overall size of the motor. The arrangement of the proportion ensures that the magnetic flux leakage of the claw tip is minimum, the induced electromotive force is maximum, and the optimal power density is ensured under the same diameter.
Further, the ratio of the thickness X1 of the heel of the front pole claw 21 to the thickness L1 of the bottom plate 211 of the front pole claw 21 is: X1/L1 is more than or equal to 0.91 and less than or equal to 1.2; meanwhile, the ratio of the thickness X1 'of the heel of the rear pole claw 22 to the thickness L1' of the bottom plate of the rear pole claw 22 is also: x1 '/L1'. Ltoreq.1.2 is more than or equal to 0.91. Specifically, the X1 and X1 'are 11.17 mm, and the L1 and L1' are 12 mm, and the scheme increases the induced electromotive force of the generator on the premise of ensuring the mechanical strength of the front and rear pole claws, so that the generator has better output capacity and power generation efficiency.
Further, the ratio of the thickness X2 of the tip of the front pole claw 21 to the thickness X1 of the heel of the front pole claw 21 is: X2/X1 is more than or equal to 0.26 and less than or equal to 0.5; meanwhile, the ratio of the thickness X2 'of the tip of the rear pole claw 22 to the thickness X1' of the heel of the rear pole claw 22 is: x2 '/X1'. Ltoreq.0.26 is not more than 0.5. Specifically, the thickness of each of the X2 and X2 'is 3.09 mm, and the thickness of each of the X1 and X1' is 11.17 mm, so that the induction electromotive force of the alternating-current generator is further increased, and the generator has better output capacity and power generation efficiency.
Preferably, the tips of the front pole claw 21 and the rear pole claw 22 are respectively provided with a tip chamfering circle, the tip chamfering circles are formed by extrusion of a cold extrusion groove formed on a die, and the radius R of the tip chamfering circles has the following value: r.gtoreq.2 mm, R=3 mm may be preferably taken. Because the top area of the claw tip of the existing polar claw is too small, the required size cannot be achieved through an extrusion process during processing; the technical scheme enlarges the area of the claw tip by enlarging the chamfering circle of the claw tip, facilitates processing by using an extrusion process, improves the production efficiency and saves the cost.
Preferably, the ratio of the circumferential distance Y of the front pole claw 21 to the rear pole claw 22 to the tooth width X of the stator core 31 is: Y/X is more than or equal to 1.5 and less than or equal to 1.99. The circumferential distance Y from the front pole claw 21 to the rear pole claw 22 refers to the width of a groove formed by the claw parts of the front pole claw 21 and the claw parts of the rear pole claw 22, which are adjacent after being mounted in a crossing manner, along the circumferential direction of the generator, specifically, the distance Y is 7.48 mm, and the distance X is 4.51 mm.
As shown in fig. 8, the teeth of the stator core 31 may have a structure in which the upper and lower tooth widths are identical, and the ratio of the width bt of the teeth of the stator core 31 to the core slot height ht is: and bt/ht is more than or equal to 0.3 and less than or equal to 0.39. Specifically, bt here is 3.28 mm, ht is 9.17 mm. According to the scheme, on the premise of considering the processing technology of the stator core 31, the winding space of the stator core slot is adjusted, the saturation of the magnetic circuit of the core is optimized, and the output power of the generator is improved. Here, as shown in fig. 9, the teeth of the stator core 31 may also have a structure in which the widths of the upper and lower teeth are not uniform, such as: the narrower tooth width of the lower end of the tooth is bt min The wider tooth width of the upper end of the tooth is bt max At this time bt= (bt) min +bt max ) And 2, compared with the tooth structure with equal width up and down in fig. 8, the structure can adjust the winding space of the stator core slot, optimize the saturation of the magnetic circuit of the core, improve the output power of the generator, and more importantly, facilitate the embedding of flat copper wires so as to improve the space utilization rate of the core slot.
More preferably, the front end of the rotor is provided with a front fan 71, and the ratio of the distance t from the top of the blade of the front fan 71 to the front end of the stator coil 32 to the height h of the blade of the front fan 71 is: t/h is less than or equal to 0.19, wherein t is 1.75 mm, and h is 11.70 mm; the rear fan 72 is installed at the rear end of the rotor, and the ratio of the distance t 'from the top of the blade of the rear fan 72 to the rear end of the stator coil 32 to the height h' of the blade of the rear fan 72 is also: t '/h' is less than or equal to 0.19, wherein t 'is 2.59 mm, h' is 14 mm, and the setting of the proportion can reduce the noise of the generator at the corresponding rotating speed within 0-22000 r/min by 1-4dB, and simultaneously increase the heat radiation capacity of the generator, optimize the air inlet quantity, the cooled area and the wind noise, thereby improving the cooling efficiency of the fan, reducing the noise pollution and improving the performance of the generator.
Further, the root portions of the front pole claw 21 and the rear pole claw 22 are provided with the wind cutting chamfer 214, the wind cutting chamfer 214 is a plane, and can be made of three-point surface, preferably arranged on the windward side of the rotation of the pole claw. As shown in fig. 10, S1 and S3 are electromagnetic noise curves of the ac generator for the vehicle in the prior art, and S2 is an electromagnetic noise curve of the ac generator for the vehicle of the present invention, and as can be seen from fig. 10, the ac generator of the present invention has smaller and more gentle noise, thereby improving the overall performance of the generator.
The following table 1 shows the results of the performance test of the alternator before improvement, and the following table 2 shows the results of the performance test of the alternator after improvement according to the present invention, wherein VDA (Verband der Automobil industrie: german automotive industry) was used as an evaluation index in the evaluation of the efficiency of the alternator for a vehicle.
Table 1 results of pre-retrofit test of alternators
Table 2 test results of the alternator of the present invention after improvement
With the arrangement of this embodiment, the efficiency of the generator can reach 69%, while the efficiency of the conventional generator under the condition of the same stator diameter is about 66%, so that the efficiency of the generator can be improved by 4.5%. In conclusion, after the automobile alternating-current generator is improved, the power generation efficiency of the generator is effectively improved, the energy waste is reduced, and the noise pollution is reduced; compared with the existing generator with equal output, the invention reduces the volume of the generator, thereby saving the production cost of the generator and the occupied space in the vehicle.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The automotive alternating current generator comprises a front end cover, a rear end cover, a rotor and a stator, wherein the rotor and the stator are fixed between the front end cover and the rear end cover; the ratio of the distance L2 from the front end surface of the stator core to the inner side of the front pole claw bottom plate to the thickness L1 of the front pole claw bottom plate is as follows: L2/L1 is less than or equal to 0.19; the ratio of the distance Lp from the claw tip of the front pole claw to the front end surface of the stator core to the height L3 of the stator core is as follows: lp/L3 is more than or equal to 0.91; the ratio of the circumferential distance Y from the front pole claw to the rear pole claw to the tooth width X of the stator core is as follows: Y/X is more than or equal to 1.5 and less than or equal to 1.99.
2. The automotive alternator according to claim 1, wherein a ratio of a distance L2 'from a rear end face of the stator core to an inside of the rear pole claw bottom plate to a thickness L1' of the rear pole claw bottom plate is: the ratio of the distance Lp' from the claw tip of the rear pole claw to the rear end surface of the stator core to the height L3 of the stator core is less than or equal to 0.19: lp'/L3 is more than or equal to 0.91.
3. The automotive alternator according to claim 2, wherein a ratio of a thickness X1 of the front pole claw heel to a thickness L1 of the front pole claw bottom plate is: X1/L1 is more than or equal to 0.91 and less than or equal to 1.2; and/or the ratio of the thickness X1 'of the rear pole claw heel to the thickness L1' of the rear pole claw bottom plate is: x1 '/L1'. Ltoreq.1.2 is more than or equal to 0.91.
4. A vehicle alternator according to claim 3 wherein the ratio of the thickness X2 of the front pole claw tip to the thickness X1 of the front pole claw heel is: X2/X1 is more than or equal to 0.26 and less than or equal to 0.5; and/or the ratio of the thickness X2 'of the trailing pole claw tip to the thickness X1' of the trailing pole claw heel is: x2 '/X1'. Ltoreq.0.26 is not more than 0.5.
5. The automotive alternator according to claim 4, wherein the claw tips of the front and rear pole claws are each provided with a claw tip chamfer circle, the claw tip chamfer circle is formed by extrusion of a cold extrusion groove formed in a die, and the radius R of the claw tip chamfer circle has the following value: r is more than or equal to 2mm.
6. The automotive alternator according to claim 1, wherein a ratio of a tooth middle width bt to a core slot height ht of the stator core is: and bt/ht is more than or equal to 0.3 and less than or equal to 0.39.
7. The automotive alternator according to any one of claims 1 to 6, wherein a front fan is mounted to a front end of the rotor, and a ratio of a distance t from a top of a fan blade of the front fan to a front end of the stator coil to a height h of the fan blade of the front fan is: t/h is less than or equal to 0.19; and/or a rear fan is arranged at the rear end of the rotor, and the ratio of the distance t 'from the top of the fan blade of the rear fan to the rear end of the stator coil to the height h' of the fan blade of the rear fan is as follows: t '/h'. Ltoreq.0.19.
8. The vehicle alternator according to claim 7, wherein the roots of the front and rear pole claws are each provided with a wind-cut chamfer, the wind-cut chamfer being a plane.
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|---|---|---|---|---|
| CN201594769U (en) * | 2009-11-12 | 2010-09-29 | 成都华川电装有限责任公司 | Alternating current generator noise reduction structure |
| CN102771033A (en) * | 2010-03-31 | 2012-11-07 | 株式会社日立制作所 | Vehicular alternating-current generator |
| CN104969458A (en) * | 2012-12-19 | 2015-10-07 | 罗伯特·博世有限公司 | Electric machine |
| CN206673803U (en) * | 2017-04-28 | 2017-11-24 | 上海法雷奥汽车电器系统有限公司 | A kind of vehicle alternator |
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| CN106877606A (en) | 2017-06-20 |
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