WO2021139086A1

WO2021139086A1 - Rotor and generator using magnetic circuit control, and control system and control method

Info

Publication number: WO2021139086A1
Application number: PCT/CN2020/095349
Authority: WO
Inventors: 房毅卓; 李章宏
Original assignee: 广东机电职业技术学院
Priority date: 2020-01-10
Filing date: 2020-06-10
Publication date: 2021-07-15
Also published as: CN111106689A; JP7299659B2; JP2022543034A

Abstract

A rotor and a generator using magnetic circuit control, and a control system and a control method. The rotor comprises: a rotor shaft (8); a pair of claw poles (1, 3) mounted on the rotor shaft (8), each of the claw poles (1, 3) having a plurality of claws (11, 12), the plurality of claws (11, 12) of the pair of claw poles (1, 3) forming a plurality of gaps, a shock absorbing member being provided in two adjacent gaps in a circumferential direction, the shock absorbing member comprising a first shock absorbing member (1-1) having a first thickness and a second shock absorbing member (1-2) having a second thickness, the first thickness being less than the thickness of an air gap, and the second thickness being greater than the thickness of the air gap; a permanent magnet ring (2); a locking mechanism enabling the claw poles (1, 3) to rotate synchronously with the rotor shaft (8) and allowing the claw poles (1, 3) to independently rotate along the rotor shaft (8); and a braking mechanism capable of braking any one of the pair of claw poles (1, 3) under an external braking force. By controlling the relative position of the claws (11, 12) of a pair of claw poles (1, 3) of a generator rotor, whether a main magnetic circuit of the pair of claw poles (1, 3) flows through a stator iron core is controlled, thereby achieving the purpose of controlling the working state of a permanent magnet generator.

Description

Rotor, generator, control system and control method using magnetic circuit control

Technical field

The invention relates to a rotor, a generator, a control system and a control method using magnetic circuit control.

Background technique

Automobile generator is one of the important parts of automobile. Automobile generators using internal combustion engines are generally used for energy transmission by the engine in a belt drive manner. During the engine operation, the generator always rotates with the engine. During the operation of the car, charging the battery and supplying power to the vehicle electrical system are the main functions of the car generator. When the battery charging process is completed, the generator will stop generating power, and the battery will supply power to the vehicle's electrical system until the battery discharge voltage is lower than the set value, the generator will enter the power generation state again.

Automobile brushless generators mainly include automobile brushless generators, rotary transformer-fed brushless generators and permanent magnet brushless generators. The brushless generators commonly used in automobiles are rotary transformer-fed brushless generators. Because the resolver partly occupies part of the space in the generator cavity, and the alternating current output by the resolver must be rectified in order to supply power to the generator rotor electromagnet. Therefore, the efficiency and specific power of the resolver-fed brushless generator are relatively low.

The automotive permanent magnet brushless generators currently used in very few car models have obvious advantages of simple structure and high working efficiency. But because it is in the idling phase after the battery is charged (ie: no power generation phase), the current between the generator and the battery is cut off through the electronic switch unit circuit (ie: the generator is in the no-load state) to stop the battery. Charging purpose. The output voltage when the generator is in the no-load state is the load state voltage, which will momentarily exceed the normal output voltage by several tens of times due to the occasional high engine speed. Once the electronic switch unit circuit is damaged, it will cause instantaneous damage to a large number of parts of the vehicle's electrical system. Due to this design flaw, automotive permanent magnet brushless generators cannot be widely used.

The working principle of the generator is: the rotor magnetic field of the generator is rotated by the rotor, so that the magnetic field of the rotor forms a magnetic circuit through the stator core, which causes the magnetic flux of the stator winding to periodically change with the rotation of the rotor, thereby generating alternating current in the stator winding.

The relative positions of the left and right claw poles (ie, the left and right magnetic poles) of the rotor of the current automobile permanent magnet generator are fixed. The gap between the left and right claw poles (magnetic poles) is much larger than the gap between the rotor and the stator. Therefore, The main magnetic circuit of the rotor magnetic field must pass through the stator core. Also, because the power transmission between the engine and the generator is connected by a belt, the generator always runs under the drive of the belt during the engine operation. Therefore, the generator is always in the state of generating electricity.

technical problem

An object of the present invention is to provide a rotor controlled by a magnetic circuit, which can control whether the main magnetic circuit of the rotor magnetic field flows through the stator, thereby achieving the purpose of controlling the working state of the permanent magnet generator.

Another object of the present invention is to provide a generator controlled by a magnetic circuit.

Another object of the present invention is to provide a control system.

Another object of the present invention is to provide a control method.

Technical solutions

For the above purpose, the present invention adopts the following technical solutions:

A rotor controlled by a magnetic circuit is provided with a stator on its outer periphery, and an air gap with a predetermined thickness is separated between the rotor and the stator, and includes:

Rotor shaft

A pair of claw poles are installed on the rotor shaft, each of the claw poles has a plurality of pole claws extending in the axial direction and arranged in the circumferential direction, and the plurality of pole claws of the pair of claw poles are mutually staggered in the circumferential direction A plurality of gaps arranged in the circumferential direction are embedded and formed, and two adjacent gaps in the circumferential direction are provided with shock-absorbing members with different thicknesses mounted on the pole claws, and the shock-absorbing members include a first shock-absorbing member having a first thickness and A second shock-absorbing member having a second thickness, the first thickness is smaller than the thickness of the air gap, and the second thickness is larger than the thickness of the air gap;

The permanent magnet ring is arranged between the pair of claw poles;

A locking mechanism that enables the claw poles to rotate synchronously with the rotor shaft and allows the claw poles to rotate independently along the rotor shaft;

... The braking mechanism can brake any one of the pair of claw poles under the action of an external braking force.

... As a preferred technical solution, the pair of claw poles includes a left claw pole and a right claw pole, and the first shock absorber and the second shock absorber are respectively installed on both sides of the pole claw of the left claw pole ；

... Alternatively, the first damping member or the second damping member is installed on one side of the pole claw of the left claw pole, and the second damping member or the first damping member is installed on the One side of the pole claw of the right claw pole;

... Alternatively, the first shock-absorbing member and the second shock-absorbing member are respectively installed on both sides of the pole claw of the right claw pole.

... As a preferred technical solution, the shock absorber is made of non-magnetic material.

... As a preferred technical solution, one end of the second shock absorber is mounted on the pole claw, and the other end is provided with a magnetic material, the magnetic material has a third thickness, and the third thickness is smaller than the second thickness;

... When a predetermined claw pole is braked, the magnetic material makes the two pole claws located on both sides of the second shock absorber connected into one body by the force of its own magnetic field; when the other predetermined claw pole is braked At this time, the first shock-absorbing member allows the two pole claws on both sides of the first shock-absorbing member to be connected into one body by the force of its own magnetic field.

... As a preferred technical solution, the locking mechanism is provided between the claw pole and the rotor shaft, the locking mechanism includes an elastic member and a card body provided at one end of the elastic member, and the rotor shaft is provided There is a accommodating groove for accommodating the elastic member, the claw pole is provided with a card groove adapted to the card body, and the elastic member applies an elastic force to the card body to make the card body enter the card groove.

... As a preferred technical solution, the elastic member is a spring or elastic rubber or an elastic sheet.

... As a preferred technical solution, the braking mechanism includes a friction plate provided on the claw pole and a brake shoe provided corresponding to the friction plate.

... A generator controlled by a magnetic circuit includes the above-mentioned rotor.

... A control system including:

... The above-mentioned generator;

... A battery, connected to the generator;

... An electronic control unit connected to the battery to detect the output voltage of the battery;

... The braking force providing member is connected to the electronic control unit and used for providing braking force for the braking mechanism to brake the predetermined claw poles, wherein the driving force providing member includes hydraulic pressure, air pressure or magnetic attraction.

... A control method using magnetic circuit control includes the following steps:

... Control the relative position of the two claw poles of the generator, and then control whether the main magnetic circuit of the rotor magnetic field flows through the stator, so as to control the working state of the generator.

Beneficial effect

The beneficial effects of the present invention include: the present invention controls the working state of the generator by controlling the relative positions of the pole claws of a pair of claw poles of the generator rotor. Control the relative position of a pair of claw poles (ie, left and right magnetic poles) of the generator rotor, and then control whether the main magnetic circuit of the pair of claw poles flows through the stator core, so as to achieve the purpose of controlling the working state of the permanent magnet generator.

Description of the drawings

FIG. 1 is a schematic diagram of an exploded structure of a rotor according to an embodiment of the present invention;

Figure 2 is a schematic side view of the structure of a rotor according to an embodiment of the present invention;

Figure 3 is a schematic diagram of a locking mechanism according to an embodiment of the present invention;

4 is a schematic diagram of the installation position of the shock absorber according to an embodiment of the present invention;

Figure 5 is a schematic diagram of a control system according to an embodiment of the present invention;

Fig. 6 is a flowchart of a control process of a control system according to an embodiment of the present invention;

Figure 7 is a schematic diagram of a rotor exploded structure (before assembly) according to another embodiment of the present invention;

8 is a schematic diagram of a side view structure (after assembly) of a rotor according to another embodiment of the present invention;

Fig. 9 is a schematic diagram of a locking structure of another embodiment of the present invention;

Fig. 10 is a schematic diagram of the installation position of the shock absorber according to another embodiment of the present invention.

Embodiments of the present invention

In order to facilitate a better understanding of the purpose, structure, features, and effects of the present invention, the present invention will now be further described with reference to the accompanying drawings and specific embodiments.

... A generator according to an embodiment of the present invention includes a rotor and a stator (not shown) provided on the outer circumference of the rotor via an air gap with a predetermined thickness.

... As shown in Figures 1, 2 and 3, and as shown in Figures 7, 8 and 9, the rotor includes a rotor shaft 8, a pair of claw poles 1, 3 mounted on the rotor shaft 8, and arranged on the pair The permanent magnet ring 2 between the claw poles 1, 3 makes the claw poles 1, 3 rotate synchronously with the rotor shaft 8 and the locking mechanism that allows the claw poles 1, 3 to independently rotate along the rotor shaft 8, which can be under the action of external driving force A brake mechanism that brakes any one of a pair of claw poles 1, 3.

... The rotor shaft 8 is rotated by external power, for example, an engine (not shown) is driven by a belt to drive the rotor shaft 8 to rotate.

... Each claw pole 1 or 3 has a plurality of pole claws 11, 12 that extend in the axial direction and are arranged in the circumferential direction. A plurality of gaps arranged in the circumferential direction, two adjacent gaps in the circumferential direction are provided with shock-absorbing members with different thicknesses mounted on the pole claws 11 and/or 12, and the shock-absorbing members include a first shock-absorbing member 1 with a first thickness. 1 and a second shock absorbing member 1-2 having a second thickness. The first thickness is less than the thickness of the air gap, and the second thickness is greater than the thickness of the air gap.

... Since the locking mechanism allows the claw poles 1, 3 to rotate independently, the braking mechanism can brake any one of the claw poles 1, 3 without causing the rotor shaft 8 to be braked. When a predetermined claw pole 1 or 3 is braked, the other claw pole 3 or 1 still follows the rotation of the rotor shaft 8. Under the action of attraction, the pole claws 11, 12 of the two claw poles 1, 3 will eventually Combine. However, since the gap is provided with a shock absorber, the combined pole claws 11, 12 will still maintain a predetermined distance due to the shock absorber, and the thickness of the shock absorber is the distance between the combined pole claws 11, 12. Depending on the claw poles 1, 3 to be braked, the pole claws 11, 12 may be coupled with a first shock-absorbing member 1-1 or a second shock-absorbing member 1-2.

... The first thickness has a predetermined thickness smaller than the air gap, so that the main magnetic circuit does not pass through the stator core. The second thickness has a predetermined thickness greater than the air gap, so that the main magnetic circuit can pass through the stator core. Therefore, when there is the first shock absorber 1-1 between the pole claws 11, 12, the main magnetic circuit does not pass through the stator core, so the generator is in an idling state (no power generation); when the pole claws 11, 12 are separated When there is the second shock absorber 1-2, the main magnetic circuit passes through the stator core, so the generator is in a power generation state. Therefore, by selectively braking one of the claw poles 1, 3, it is possible to control whether the main magnetic circuit flows through the stator core, thereby achieving the purpose of controlling the working state of the permanent magnet generator.

... A pair of claw poles 1 and 3 includes a left claw pole 1 and a right claw pole 3, the left claw pole 1 has a left claw 11, and the right claw pole 3 has a right claw 12. According to different embodiments, the first shock absorber 1-1 and the second shock absorber 1-2 may be respectively installed on both sides of the pole claw of the left claw pole 1 (ie, both sides of the left pole claw 11). Alternatively, the first shock absorbing member 1-1 or the second shock absorbing member 1-2 may be installed on one side of the pole claw of the left claw pole 1 (that is, the side of the left pole claw 11), and the second shock absorbing member 1- 2 or the first shock-absorbing member 1-1 can be installed on one side of the pole claw of the right claw pole 3 (that is, the side of the right pole claw 12); or, the first shock-absorbing member 1-1 and the second shock-absorbing member 1-2 can be installed on both sides of the pole claw of the right claw pole 3 (that is, the two sides of the right pole claw 12).

... In some embodiments, the shock-absorbing member is a non-magnetic material, such as plastic, rubber, and the like. The use of non-magnetic materials can increase the magnetic resistance when the left and right claw poles 1, 3 are combined, that is, reduce the magnetic field interaction force between the two, and facilitate the separation of the two by braking.

In some embodiments, one end of the second shock absorbing member 1-2 is mounted on the pole claw, and the other end is provided with a magnetic material 1-3, such as iron, cobalt, nickel, etc. Since the thickness of the second shock absorber 1-2 is relatively thick, the magnetic material 1-3 is arranged to make the magnetic material 1-3 attracted by the pole claws, which can further ensure that the left and right pole claws 11, 12 can be combined. The magnetic material 1-3 has a third thickness, and the third thickness is smaller than the second thickness. That is, the magnetic material 1-3 is thinner, such as an iron sheet, so that the attractive force between the pole claws and the magnetic material 1-3 can be reduced. Large, easy to separate the two by braking.

... In some embodiments, when a predetermined claw pole 1 or 3 is braked, the magnetic material 1-3 makes the two pole claws 11, 12 located on both sides of the second shock absorber 1-2 act by their own magnetic field force. Connected into one body, that is, the magnetic materials 1-3 play an auxiliary attraction role. The two poles 11, 12 are mainly attracted to each other through their own magnetic field force; when the predetermined other claw pole 3 or 1 is braked, the first A shock absorber 1-1 allows the two pole claws 11, 12 on both sides of the first shock absorber 1-1 to be connected into one body by the force of its own magnetic field. In order to ensure that the two pole claws 11, 12 on both sides of the first shock-absorbing member 1-1 can suck each other by themselves, the first shock-absorbing member 1-1 needs to be thinner, so the first shock-absorbing member 1-1 Preferably it is a shock absorbing film.

... Figure 3 shows the locking mechanism of the claw poles 1,3. The locking mechanism is arranged between the claw poles 1, 3 and the rotor shaft 8. The locking mechanism includes an elastic member 9 and a card body 10 provided at one end of the elastic member 9. The rotor shaft 8 is provided with a receiving groove 13 for receiving the elastic member 9. The claw poles 1 and 3 are provided with a card slot 14 adapted to the card body 10, the card slot 14 is arranged along the circumferential direction, and the elastic member 9 exerts an elastic force on the card body 10 to make the card body 10 enter the card slot 14. The elastic member 9 is a spring or elastic rubber or an elastic sheet or other objects capable of applying elastic force. The card body 10 can be a steel ball, an iron ball or other objects with a suitable structure.

... When one of the claw poles 1 or 3 is braked, the pole claw 1 or 3 rotates relative to the rotor shaft 8. In this process, the pole claw 1 or 3 presses down the card body 10, and the elastic member 9 is compressed at the same time, At this time, the pole claw 1 or 3 can rotate without being restricted by the rotor shaft 8. When the driving force disappears, under the action of the elastic force of the elastic member 9, the card body 10 is bounced and snapped into the card slot again. At this time, the pole claws 1 and 3 rotate together with the rotor shaft 8.

... The braking mechanism includes a friction plate arranged on the claw pole and a brake shoe arranged corresponding to the friction plate. Under the action of external driving force, the brake shoe can brake the corresponding claw pole through contact and friction with the friction plate. The left friction plate 6 is located at the left claw pole 1, the right friction plate 4 is located at the right claw pole 3, the left brake shoe 7 corresponds to the left friction plate 6, and the right brake shoe 5 corresponds to the right friction plate 4.

... FIG. 4 shows an embodiment in which the first shock absorbing member 1-1 and the second shock absorbing member 1-2 are respectively installed on both sides of the pole claw of the left claw pole 1. In this embodiment, the first shock absorber 1-1 is installed on the upper side of the pole claw of the left pole claw 11, and the second shock absorber 1-2 is installed on the lower side of the pole claw of the right pole claw 12. Of course, in other embodiments, the installation positions of the first shock-absorbing member 1-1 and the second shock-absorbing member 1-2 can be interchanged.

... According to FIGS. 4 and 10, the arrow indicates the direction of rotation of the rotor shaft 8. When the left claw pole 1 is braked instantaneously, the upper side of the left pole claw 11 is combined with the lower side of the right pole claw 12, and because the two pole claws are different-named magnetic poles, there is an attractive force between them. Attraction can prevent the two from separating. Since the thickness of the first shock absorber 1-1 is much smaller than the air gap between the rotor and the stator (ie the gap between the rotor and the stator), at this time, the left and right claw poles 1, 3 pass through the respective pole claws 11 , The main magnetic circuit formed by 12 does not pass through the stator core. When the driving force disappears, the left and right claw poles 1, 3 rotate synchronously with the rotor shaft 8 under the action of the locking mechanism. At this time, the main magnetic circuit of the left and right claw poles 1, 3 does not pass through the stator core. Therefore, the generator is in an idling state (not generating electricity).

... That is: the left claw pole 1 of the generator rotor is braked instantaneously to make the generator in an idling state.

... When the right claw pole 3 is braked instantaneously, the lower side of the left pole claw 11 is combined with the upper side of the right pole claw 12, and the magnetic material 1-3 is attracted by the right pole claw 12, this attraction can be Prevent the two from separating. Since the thickness of the second shock absorber 1-2 is much larger than the air gap between the rotor and the stator (that is, the gap between the rotor and the stator), at this time, the left and right claw poles 1, 3 form the main body through the stator core. Magnetic circuit. When the driving force disappears, the left and right claw poles 1, 3 rotate synchronously with the rotor shaft 8 under the action of the locking mechanism. At this time, because the main magnetic circuit passes through the stator core. Therefore, the generator is in a state of generating electricity.

... That is: the right claw pole 3 of the generator rotor is braked instantaneously to make the generator in the power generation state.

As shown in Figure 5, the present invention also provides a control system, which includes the above-mentioned generator GEN, a battery BATT connected to the generator GEN, an electronic control unit ECU connected to the battery BATT, and an electronic control unit ECU connected to the electronic control unit ECU. The driving force provider, the load L connected to the battery BATT, and the isolation diode D connected to the battery BATT.

The load L represents all the loads of the vehicle electrical system. In this embodiment, the driving force providing member is an electromagnet, which provides a driving force for the braking mechanism to brake a predetermined claw pole through magnetic attraction, that is, the brake shoe is driven to contact the friction plate for braking. In other embodiments, the driving force may also be provided by hydraulic pressure, pneumatic pressure, or other suitable methods. The electromagnet includes a first braking electromagnet M1 for braking the right pole paw 3 and a second braking electromagnet M2 for braking the left pole pawl 1.

The G terminal of the isolation diode D is connected to the generator GEN, the B terminal is connected to the battery BATT, and the electronic control unit ECU is connected to its G terminal and B terminal. The electronic control unit ECU collects the generator GEN output voltage at point G at the left end of the isolation diode D and the battery BATT voltage signal at point B at its right end to determine the current battery BATT charging status, and controls the electromagnet to achieve the left and right claw poles 1, 3 The pole claws are combined to control the working state of the generator GEN.

As shown in Figure 6, the working state control of the automobile generator GEN mainly includes three stages (take braking the right claw pole 3 to make the generator GEN in the power generation state, and braking the left claw pole 1 to make the generator GEN in the idling state as an example. ):

(1) Start the charging phase

After the engine is started, the electronic control unit ECU instantaneously energizes the first brake electromagnet M1, instantaneously brakes the right claw pole 3 of the generator GEN rotor, so that the generator GEN is in the power generation state, and the battery BATT is charged. In the charging phase, the electronic control unit ECU detects the output voltage of the battery BATT by detecting the potential at point B at the right end of the isolation diode D. When the potential at point B is greater than or equal to a certain predetermined value (preferably 13.5V, or 14.5V, or it can vary depending on the technical specifications of the battery used in the car power system), the start-up charging phase ends.

(2) BATT discharge stage of the battery

After the start-up charging phase is completed, the electronic control unit ECU instantaneously energizes the second brake electromagnet M2, instantaneously brakes the left claw pole 1 of the generator GEN rotor, so that the generator GEN is in an idling state, and the battery BATT enters the discharge phase. When the potential at point B is less than or equal to a predetermined value (13.0V in this embodiment), the discharge phase is terminated.

(3) Secondary charging stage

After the battery BATT discharge phase is completed, the electronic control unit ECU instantaneously energizes the brake electromagnet M1, so that the generator GEN is in a power generation state to charge the battery BATT. Until the potential at point B is greater than or equal to a certain predetermined value (preferably 13.5V, or 14.5V, or it can be changed due to different technical specifications of the battery used in the car power system), the battery BATT discharge stage is entered again. This cycle continues until the engine stops running.

The present invention also provides a control method using magnetic circuit control, which includes the following steps:

Control the relative position of the two claw poles of the generator, and then control whether the main magnetic circuit of the rotor magnetic field flows through the stator, so as to control the working state of the generator.

The above detailed description is only the description of the preferred embodiments of the present invention, and does not limit the scope of the patent of the present invention. Therefore, all equivalent technical changes made by using the content of this creation specification and illustrations are included in the creation of the patent. Within range.

Claims

A rotor controlled by a magnetic circuit is provided with a stator on its outer periphery, and an air gap with a predetermined thickness is separated between the rotor and the stator, and is characterized in that it comprises:

Rotor shaft;

A pair of claw poles are installed on the rotor shaft, each of the claw poles has a plurality of pole claws extending in the axial direction and arranged in the circumferential direction, and the plurality of pole claws of the pair of claw poles are mutually staggered in the circumferential direction A plurality of gaps arranged in the circumferential direction are embedded and formed, and two adjacent gaps in the circumferential direction are provided with shock-absorbing members with different thicknesses mounted on the pole claws, and the shock-absorbing members include a first shock-absorbing member having a first thickness and A second shock-absorbing member having a second thickness, the first thickness is smaller than the thickness of the air gap, and the second thickness is larger than the thickness of the air gap;

The permanent magnet ring is arranged between the pair of claw poles;

The locking mechanism enables the claw poles to rotate synchronously with the rotor shaft and allows the claw poles to rotate independently along the rotor shaft;

The braking mechanism can brake any one of the pair of claw poles under the action of an external driving force.
The rotor controlled by a magnetic circuit according to claim 1, wherein the pair of claw poles includes a left claw pole and a right claw pole, and the first damping member and the second damping member are installed separately On both sides of the pole claw of the left claw pole;

Alternatively, the first damping member or the second damping member is installed on one side of the pole claw of the left claw pole, and the second damping member or the first damping member is installed on the One side of the pole claw of the right claw pole;

Or, the first shock-absorbing member and the second shock-absorbing member are respectively installed on both sides of the pole claw of the right claw pole.
The rotor controlled by a magnetic circuit according to claim 1, wherein the damping member is made of non-magnetic material.
The rotor controlled by a magnetic circuit according to claim 3, wherein one end of the second shock absorber is mounted on the pole claw, and the other end is provided with a magnetic material, and the magnetic material has a third thickness and a third thickness. Less than the second thickness;

When a predetermined claw pole is braked, the magnetic material makes the two pole claws located on both sides of the second shock absorber connected into one body by the force of its own magnetic field; when the other predetermined claw pole is braked At this time, the first shock-absorbing member allows the two pole claws on both sides of the first shock-absorbing member to be connected into one body by the force of its own magnetic field.
The rotor controlled by a magnetic circuit according to claim 1, wherein the locking mechanism is arranged between the claw poles and the rotor shaft, and the locking mechanism includes an elastic member and is arranged on the The card body at one end of the elastic member, the rotor shaft is provided with a receiving groove for accommodating the elastic member, the claw pole is provided with a groove adapted to the card body, and the elastic member exerts an elastic force on the card body Make the card body enter the card slot.
The rotor controlled by a magnetic circuit according to claim 5, wherein the elastic member is a spring or an elastic rubber or an elastic sheet.
The rotor controlled by a magnetic circuit according to claim 1, wherein the braking mechanism includes a friction plate arranged on the claw pole and a brake shoe arranged corresponding to the friction plate.
A generator controlled by a magnetic circuit, characterized by comprising the rotor according to any one of claims 1-7.
A control system, characterized in that it comprises:

The generator of claim 8;

A battery, connected to the generator;

An electronic control unit connected to the battery to detect the output voltage of the battery;

The driving force providing member is connected with the electronic control unit and is used to provide a driving force for the braking mechanism to brake a predetermined claw pole, wherein the driving force providing member includes hydraulic pressure, air pressure or magnetic attraction.
A control method using magnetic circuit control is characterized in that it comprises the following steps:

Control the relative position of the two claw poles of the generator, and then control whether the main magnetic circuit of the rotor magnetic field flows through the stator, so as to control the working state of the generator.