CN-117639326-B - Composite excitation rotor structure and vehicle-mounted generator

CN117639326BCN 117639326 BCN117639326 BCN 117639326BCN-117639326-B

Abstract

A composite excitation rotor structure comprises a rotating shaft connected to front and rear end covers of a generator through a bearing, a first claw pole and a second claw pole connected to the rotating shaft, wherein the first claw pole is provided with 2N claw tips, the second claw pole is provided with claw tips with the same size and number as those of the first claw pole, claw tip parts of the first claw pole and the second claw pole are alternately arranged along the periphery of the circumference, permanent magnets are arranged in gaps formed between adjacent claw tips at intervals, one end of each permanent magnet is connected to the claw tip of the first claw pole, and the other end of each permanent magnet is connected to the claw tip of the second claw pole through a non-magnetic spacer which enables the permanent magnet to deviate from the middle position of the gap between the adjacent claw tips. According to the invention, one side of the permanent magnet is greatly different from the magnetic flux passing through the other side, and harmonic components generated during the working of the rotor can be offset with harmonic components generated by the stator core, so that the harmonic wave of the output power supply of the generator is reduced, and the quality of the output power supply is improved.

Inventors

FAN CHAO
ZHANG DI
LI WEICHAO
YU LANG
RUAN MEIQI
XUE YUFEI

Assignees

襄阳航力机电技术发展有限公司

Dates

Publication Date: 20260512
Application Date: 20231219

Claims (10)

1. A composite excitation rotor structure comprises a rotating shaft connected to front and rear end covers of a generator through a bearing, a first claw pole, a second claw pole, a magnetic yoke, an excitation coil, wherein the first claw pole, the second claw pole, the magnetic yoke and the excitation coil are fixed on the rear end cover of the generator, the excitation coil is wound on the yoke frame, the first claw pole is provided with 2n claw tips, the second claw pole is provided with claw tips with the same size and number as those of the first claw pole, claw tip parts of the first claw pole and the second claw pole are alternately arranged along the periphery of the circumference, and the composite excitation rotor structure is characterized in that 4n gaps are formed between every two adjacent claw tips, permanent magnets are arranged in the 4n gaps at intervals, all the permanent magnets are identical in polarity orientation, the composite excitation rotor structure further comprises non-magnetic spacer blocks, one end of each permanent magnet is connected to the claw tip of the first claw pole, and the other end of each permanent magnet is connected to the claw tip of the second claw pole through the non-magnetic spacer blocks.
2. The composite excitation rotor structure of claim 1, wherein the permanent magnets are rectangular, and have N poles and S poles at both ends.
3. The composite excitation rotor structure of claim 2, wherein the polarities of all the permanent magnets are the same, and specifically, the S-pole ends of the permanent magnets are connected to the claw tips of the first claw pole, and the N-pole ends of the permanent magnets are connected to the claw tips of the second claw pole through nonmagnetic spacer blocks.
4. The composite excitation rotor structure of claim 2, wherein all permanent magnets have the same polarity orientation, specifically, the N-pole end of each permanent magnet is connected to the claw tip of the first claw pole, and the S-pole end is connected to the claw tip of the second claw pole through a non-magnetic spacer.
5. The composite excitation rotor structure of claim 1, wherein the ratio of the length A of the nonmagnetic spacer to the length B of the permanent magnet is 1:7-9.
6. The composite excitation rotor structure of claim 1, wherein the non-magnetic spacer is made of austenitic stainless steel, copper or aluminum alloy.
7. The composite excitation rotor structure of claim 1, wherein one end of the permanent magnet is adhered to the claw tip of the first claw pole, the other end of the permanent magnet is adhered to the non-magnetic spacer, and the other end of the non-magnetic spacer is adhered to the claw tip of the second claw pole.
8. The composite excitation rotor structure of claim 1, wherein the first claw is a ring claw and the second claw is a disk claw.
9. The composite excitation rotor structure of claim 1, wherein the first claw is a disk claw and the second claw is a ring claw.
10. A vehicle-mounted generator comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are arranged in the shell, and the vehicle-mounted generator is characterized in that the rotor assembly adopts the composite excitation rotor structure as set forth in any one of claims 1-9.

Description

Composite excitation rotor structure and vehicle-mounted generator Technical Field The invention belongs to the technical field of generators, and particularly relates to a rotor claw pole structure. Background In general, most of rotors of vehicle-mounted generators adopt claw pole rotor cores, one claw pole rotor consists of a plurality of pairs of claw poles, two claw poles of each pair of claw poles are staggered relatively, the claw poles are arranged along the circumferential direction, a magnetic yoke with an excitation winding is placed in a cavity in each claw pole, the magnetic yoke is fixed on an end cover, the excitation winding is wound by high-insulation performance and high-strength enameled wires, and when the excitation winding is electrified, axial magnetic flux is generated in the magnetic yoke, so that claw tip parts on one pair of claw poles are magnetized into N poles and S poles respectively, and the claw tips of the plurality of pairs of claw poles form N, S poles which are staggered mutually. The magnetized claw tips provide magnetic flux for the stator core, and after entering the gap between the stator and the rotor, the magnetic flux sequentially passes through the stator core teeth part and the stator core yoke part, and the core teeth part and the gap between the stator and the rotor are received again by the claw tips on the rotor. The present inventors have found that a rotor processed by this method generates a higher third harmonic component during operation, so that the output power quality of the generator is poor, and the claw tips of the claw poles and the permanent magnets placed between the claw tips need to be specially designed, but the special-shaped structure increases the processing difficulty of the claw pole tips and the permanent magnets. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a composite excitation rotor structure for a vehicle-mounted generator, which is formed by a method of offset mounting permanent magnets in the vacant space between claw poles to increase the magnetic flux of the generator rotor under the condition of not increasing the whole size of the generator, so that the power density of the product is improved. The technical scheme includes that the composite excitation rotor structure comprises a rotating shaft, a first claw pole, a second claw pole, a magnetic yoke and an excitation coil, wherein the rotating shaft is connected to front and rear end covers of a generator through a bearing, the first claw pole, the second claw pole, the magnetic yoke and the excitation coil are connected to the rear end covers of the generator, the excitation coil is wound on the magnetic yoke frame, the first claw pole is provided with 2n claw tips, the second claw pole is provided with claw tips with the same size and number as the first claw pole, claw tip parts of the first claw pole and the second claw pole are alternately placed along the periphery of the circumference, 4n gaps are formed between every two adjacent claw tips, permanent magnets are arranged in the 4n gaps at intervals, all the permanent magnets are identical in polarity orientation, the composite excitation rotor structure further comprises non-magnetic spacer blocks used for enabling the permanent magnets to deviate from the middle positions of the gaps between every two adjacent claw tips, one end of each permanent magnet is connected to the claw tip of the first claw pole, and the other end of each permanent magnet is connected to the claw tip of the second claw pole through the non-magnetic spacer blocks. The permanent magnet is cuboid, and two ends are respectively N pole and S pole. The polarities of all the permanent magnets are the same, specifically, the S-terminal of each permanent magnet is connected with the claw tip of the first claw pole, and the N-terminal is connected with the claw tip of the second claw pole through the non-magnetic spacer. The polarities of all the permanent magnets are the same, specifically, the N-terminal of each permanent magnet is connected with the claw tip of the first claw pole, and the S-terminal is connected with the claw tip of the second claw pole through the non-magnetic spacer. The ratio of the length A of the non-magnetic spacer to the length B of the permanent magnet is 1:7-9. The non-magnetic spacer blocks are made of austenitic stainless steel, copper or aluminum alloy. One end of the permanent magnet is adhered to the claw tip of the first claw pole, the other end of the permanent magnet is adhered to the non-magnetic spacer, and the other end of the non-magnetic spacer is adhered to the claw tip of the second claw pole. One end of the permanent magnet is adhered to the claw tip of the first claw pole through high-strength structural adhesive, the other end of the permanent magnet is adhered to the non-magnetic spacer 12 through high-strength structural adhesive, and the other end