CN203289252U - Permanent magnet rotor of automobile generator - Google Patents

Abstract

The utility model discloses a permanent magnet block rotor of an automobile generator, which includes the setting of the magnetic induction coercive force of the permanent magnet block and the intensity of the electric excitation magnetic field, the setting of the magnetic induction intensity of the permanent magnet block, the setting of the minimum magnetic induction intensity of the rotor, the setting of the permanent magnet The setting of block temperature resistance and the wiring method of excitation winding and slip ring. The utility model stipulates that the intensity of the electric excitation magnetic field should not be greater than 60% of the magnetic induction coercive force of the permanent magnet block; the magnetic induction intensity of the permanent magnet block between the claw poles of the rotor should be higher than 0.6 Tesla; the minimum magnetic induction intensity of the rotor should be able to meet the requirements of the engine. At the highest speed, the output voltage of the generator is not higher than the rated value; the long-term working temperature of the selected permanent magnet block should be higher than 180°C; The block magnetic field and the electric excitation magnetic field are combined to form N pole and S pole of the generator magnetic field. The output power of the generator manufactured according to the utility model can be adjusted, the power is large, the efficiency is high, the service life is long, and raw materials are saved.

Description

Permanent Magnet Block Rotor for Automotive Alternator

【Technical field】

The utility model relates to a generator rotor, in particular to an automobile generator rotor, which belongs to the technical field of vehicle generators. the

【Background technique】

At present, in order to increase the power output of generators with radial claw-shaped magnetic poles as the excitation rotor, one of the methods is to arrange permanent magnet blocks between the front and rear two claw-shaped magnetic poles to prevent magnetic flux leakage and Provides a magnetic field in the opposite direction, but because the magnetic potential generated by the excitation winding and the armature reaction magnetic potential have a demagnetization effect, and the working environment temperature of the automobile generator is relatively high, if the parameter settings of the various components of the generator rotor are unreasonable, in long-term use The magnetic induction intensity of the permanent magnet block will gradually decrease, and the output power of the generator will decrease, making its working stability, reliability and service life significantly worse. the

When the magnetic flux generated by the permanent magnet block does not match the cross-sectional area of the soft magnetic material in the electric excitation magnetic circuit, the rotor will have a strong residual magnetic field, and the output voltage of the generator will be higher than the rated voltage when the generator speed is high Affect. the

Therefore, in order to solve the above technical problems, it is indeed necessary to set the value of the permanent magnet rotor installed in the generator, so as to produce a generator that can work normally in a high temperature environment for a long time. the

【Content of invention】

In order to solve the above problems, the purpose of this utility model is to provide a generator magnetic field that is jointly used by the electric excitation and the permanent magnet block, and at a relatively high ambient temperature, the magnetic potential generated by the field winding and the armature reaction magnetic potential will not The reduction of the magnetic induction intensity of the permanent magnet blocks will affect the output power and service life of the generator for automobile generators, and the output voltage will not exceed the rated voltage when the generator is running at the highest possible speed. the

In order to achieve the above purpose, the technical solution adopted by the utility model is: the permanent magnet rotor of the automobile generator is applied in the automobile generator, and the generator includes a pulley, a front end cover, a rear end cover, a stator assembly, a claw rotor, Permanent magnet block, magnetic field N pole, magnetic field S pole, rotor yoke, excitation winding, armature winding, conductive slip ring, rectification system and regulator; wherein, the pulley is installed at one end of the claw rotor; the magnetic field N poles and S poles of the magnetic field are accommodated in the stator assembly; and the stator assembly is accommodated in the front end cover and the rear end cover; the excitation winding is installed on the periphery of the claw rotor yoke; the permanent magnet block is installed on the excitation The outer surface of the winding is located between the N pole of the magnetic field and the S pole of the magnetic field; when there is no current passing through the excitation winding, the magnetic field generated by the permanent magnet block forms a circuit through the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field; there is current in the excitation winding When passing through, the magnetic field generated by the permanent magnet block is cut off through the loop formed by the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field. Equipped with armature winding, the armature winding is connected with the rectification system installed on the rear end cover; the conductive slip ring is installed at the rear end of the rotor, which is connected with the excitation winding, and the excitation winding is fed with the maximum excitation current When the electric excitation magnetic field acts on the permanent magnet block, the magnetic field strength is not greater than 60% and not less than 10% of the magnetic induction coercivity of the permanent magnet block, and the magnetic induction coercive force of the raw material selected for the permanent magnet block is greater than 500KA/m at 20°C . the

The utility model is further set as: when the excitation current passing through in the excitation winding is zero, the magnetic induction intensity of the permanent magnet block between the claw poles of the rotor should be higher than 0.6 Tesla. the

The utility model is further set as: the minimum magnetic induction intensity of the rotor should be able to meet the requirement that the terminal voltage is not higher than the rated value when the output current of the generator is not greater than 1A under the condition of the highest rotational speed of the engine; At zero time, the total magnetic flux generated by the permanent magnet blocks between the claw poles can completely form a loop through the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field. , to meet the needs of high-speed generators. the

The utility model is further set as: the long-term working temperature resistance of the permanent magnet block is higher than 180°C. the

The utility model is further set as follows: the excitation winding and the conductive slip ring are randomly connected in two states, one is that the excitation current reaches the excitation winding through the slip ring, and the direction of the magnetic field generated by the excitation winding and the magnetic field generated by the permanent magnet pass through Magnetic field N pole, rotor yoke, and magnetic field S pole form a loop with the same magnetic field direction. After the excitation current is passed through, the magnetic field generated by the permanent magnet block passes through the loop more smoothly, and the magnetic field that the generator rotor can be used for power generation is relatively weak; One is that the excitation current reaches the excitation winding through the slip ring, and the direction of the magnetic field generated by the excitation winding is opposite to the direction of the magnetic field generated by the permanent magnet block through the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field to form a loop, which can prevent the magnetic field of the permanent magnet block Passing through this circuit, the magnetic field of the permanent magnet block is cut off in this circuit and generates a magnetic field in the opposite direction, which is combined with the magnetic field of the permanent magnet block to form the N pole and S pole of the motor magnetic field. The magnetic field of the generator rotor can be used for power generation. For the requirements of the generator on the magnetic field, the utility model specifically stipulates that the connection mode between the excitation winding and the conductive slip ring should be kept when the excitation winding has no current passing through. The permanent magnet block generates a magnetic field and passes through the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field to form a circuit; When the excitation winding has a current passing through it, the magnetic field generated by the permanent magnet block is cut off through the loop formed by the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field. N pole, S pole. the

Compared with the prior art, the utility model has the following beneficial effects: the output power of the generator made of the permanent magnet rotor of the automobile generator according to the utility model can be adjusted at will according to the needs, and the volume of the automobile generator can be significantly reduced. The output power is increased, the conversion efficiency is improved, the working reliability is increased, and the service life is increased. the

【Description of drawings】

Fig. 1 is the sectional view of the permanent magnet block rotor of the utility model automobile generator making generator. the

Fig. 2 is a schematic diagram of the permanent magnet rotor of the automobile generator of the utility model when all the permanent magnets are arranged between the magnetic field N pole and the magnetic field S pole when the generator is manufactured. the

Fig. 3 is a schematic diagram of the permanent magnet block rotor of the automobile generator of the utility model when the permanent magnet blocks are arranged alternately between the magnetic field N pole and the magnetic field S pole. the

【Detailed ways】

Please refer to accompanying drawings 1 and 2 shown in the description, which is the first embodiment of the present utility model, which consists of pulley 1, front end cover 2, rear end cover 9, stator assembly 6, rotor 13, permanent magnet block 4, magnetic field N pole 3, magnetic field S pole 5, rotor yoke 7, excitation winding 8, armature winding 16, conductive slip ring 10, rectification system 11 and regulator 12 and other parts. the

Wherein, the pulley 1 is installed at one end of the rotor 13, which can drive the rotor 13 to rotate to generate electricity. the

The magnetic field N pole 3 and the magnetic field S pole 5 are accommodated in the stator assembly 6 ; and the stator assembly 6 is accommodated in the front end cover 2 and the rear end cover 9 . the

The excitation winding 8 is installed on the periphery of the rotor yoke 7; the permanent magnet block 4 is installed on the outer surface of the excitation winding 8, and is located between the N pole 3 and the S pole 5 of the magnetic field. When there is no current passing through the excitation winding 8, the magnetic field generated by the permanent magnet block 4 passes through the magnetic field N pole 3, the rotor yoke 7, and the magnetic field S pole 5 to form a loop. When the excitation winding 8 has a current passing through, the magnetic field produced by the permanent magnet block 4 is cut off by the loop formed by the magnetic field N pole 3, the rotor yoke 7, and the magnetic field S pole 5. The magnetic field merges. That is to say, the excitation winding 8 can adjust the magnetic induction intensity of the magnetic field N pole 3 and S pole 5 when the excitation current is passed through, and control the output power of the generator; this requires that the excitation winding 8 can prevent the permanent magnet block 4 from The generated magnetic field passes through the rotor yoke 7 , and generates a reverse magnetic field and merges with the magnetic field of the permanent magnet block 4 to form a magnetic field N pole 5 and S pole 3 . If the circuit of the excitation winding 8 is reversely connected, the excitation current passes in the opposite direction, and the generator will not be able to enter the working state. the

The inner surface of the stator assembly 6 is embedded with the armature winding 16 , and the armature winding 16 is connected with the rectification system 11 installed on the rear end cover 9 . The conductive slip ring 10 is installed on the rear end of the rotor 13 and connected with the excitation winding 8 . the

In this embodiment, the permanent magnet block 4 is arranged between the magnetic field N pole 5 and the magnetic field S pole 3. When the excitation winding 8 is fed with the maximum excitation current, the magnetic field strength of the electric excitation magnetic field acting on the permanent magnet block is Not more than 60% and not less than 10% of the magnetic induction coercive force of the permanent magnet block. The magnetic induction coercive force of the raw material used for the permanent magnet block is greater than 500KA/m at 20°C. the

In this embodiment, when the excitation current passing through the excitation winding 8 is zero, the magnetic induction intensity of the permanent magnet block 4 between the claw poles of the rotor should be higher than 0.6 Tesla. the

In this embodiment, the minimum magnetic induction of the rotor 13 can meet the requirement that the terminal voltage is not higher than the rated value when the output current of the generator is not greater than 1A at the highest speed of the engine. the

In this embodiment, the long-term working temperature resistance of the permanent magnet block 4 is higher than 180°C. the

Please refer to the accompanying drawings 1 and 3 of the description, which is the second embodiment of the present utility model, which differs from the first embodiment in that permanent magnets are arranged alternately between the N poles 5 and S poles 3 of the magnetic field Block 4, the magnetic field N pole 5 is formed by the N pole of the electric excitation magnetic field and the N pole magnetic field of the permanent magnet block 4 on one side; the magnetic field S pole 3 is formed by the electric excitation magnetic field S pole and the permanent magnet block 4 on one side The S pole magnetic field is combined. the

The specific implementation above is only a preferred embodiment of this creation, and is not intended to limit this creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this creation should be included in this creation. within the scope of protection. the

Claims (5)

1. The permanent magnet rotor of automobile generator is used in automobile generator. The generator includes pulley, front end cover, rear end cover, stator assembly, claw rotor, permanent magnet block, magnetic field N pole, magnetic field S pole, Rotor yoke, excitation winding, armature winding, conductive slip ring, rectification system and regulator; wherein, the pulley is installed at one end of the claw rotor; the magnetic field N pole and magnetic field S pole are accommodated in the stator assembly; The stator assembly is accommodated in the front end cover and the rear end cover; the excitation winding is installed on the periphery of the claw-shaped rotor yoke; Between the poles; when there is no current passing through the excitation winding, the magnetic field generated by the permanent magnet block passes through the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field to form a loop; when the current passes through the excitation winding, the magnetic field generated by the permanent magnet block passes through the N pole of the magnetic field , the circuit formed by the rotor yoke and the S pole of the magnetic field is cut off, and an opposite magnetic field is generated in the circuit at the same time, which merges with the magnetic field of the permanent magnet block; the inner surface of the stator assembly is embedded with an armature winding, which is connected to the The rectification system on the rear end cover is connected; the conductive slip ring is installed on the rear end of the rotor, and it is connected with the excitation winding. The magnetic field strength on the magnetic block is not more than 60% and not less than 10% of the magnetic induction coercive force of the permanent magnet block. The magnetic induction coercive force of the raw material used for the permanent magnet block is greater than 500KA/m at 20°C. the 2. The permanent magnet rotor of an automobile generator as claimed in claim 1, characterized in that: when the exciting current passing through the exciting winding is zero, the magnetic induction of the permanent magnet between the claw poles of the rotor should be higher than 0.6 Tesla. the 3. The permanent magnet rotor of an automobile generator as claimed in claim 1, characterized in that: the minimum magnetic induction of the rotor should be able to satisfy the condition that the output current of the generator is not greater than 1A at the highest speed of the engine, and the terminal voltage is not higher than the rated value. the 4. The permanent magnet rotor of an automobile generator according to claim 1, wherein the long-term working temperature resistance of the permanent magnet is higher than 180°C. the 5. The permanent magnet block rotor of automobile generator as claimed in claim 1, is characterized in that: the connection mode of excitation winding and conductive slip ring should keep when excitation winding does not have electric current to pass through, and permanent magnet block produces magnetic field and passes magnetic field N pole, The rotor yoke and the S pole of the magnetic field form a loop; when the excitation winding has a current passing through it, the magnetic field generated by the permanent magnet block is cut off through the loop formed by the N pole of the magnetic field, the rotor yoke, and the S pole of the magnetic field, and an opposite magnetic field is generated in the loop at the same time. Combined with the magnetic field of the permanent magnet block to form the N pole and S pole of the generator magnetic field. the

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