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

Abstract

The present invention discloses a rotor, a generator, a control system and a control method using magnetic circuit control. The rotor includes: a rotor shaft; a pair of claw poles mounted on the rotor shaft, each claw pole having a plurality of pole claws, and the plurality of pole claws of the pair of claw poles form a plurality of gaps. A shock absorber is provided in two circumferentially adjacent gaps. The shock absorber includes a first shock absorber having a first thickness and a second shock absorber 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; a permanent magnet ring; 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; a braking mechanism that can brake any one of the pair of claw poles under the action of an external braking force. The present invention controls the relative positions of the pole claws of a pair of claw poles of the generator rotor, thereby controlling whether the main magnetic circuit of the pair of claw poles flows through the stator core, and further achieving the purpose of controlling the working state of the permanent magnet generator.

Description

Technical Field

[0001] The present invention relates to a rotor, a generator, a control system and a control method that adopt magnetic circuit control. Background Art

[0002] An automotive generator is one of the important components of an automobile. Automotive generators that use internal combustion engines generally transfer energy in a belt-driven manner by the engine. During engine operation, the generator always rotates with the engine. During vehicle operation, charging the battery and powering the vehicle's electrical system are the main functions of the automotive generator. When the battery charging process is completed, the generator stops generating electricity, and the battery powers the vehicle's electrical system until the battery discharge voltage is lower than the set value, at which point the generator enters the power generation state again.

[0003] Brushless automotive generators mainly include brushless automotive generators with resolver energy feeding and permanent magnet brushless generators. The currently widely used brushless automotive generator is a resolver energy feeding type brushless generator. Since the resolver part occupies a part of the space inside the generator cavity and the alternating current output by the resolver must be rectified to supply power to the generator rotor electromagnet, the efficiency and specific power of the resolver energy feeding type brushless generator are relatively low.

[0004] The automotive permanent magnet brushless generator currently applied in very few vehicle models has the obvious advantages of simple structure and high working efficiency. However, during the idling stage after the battery charging is completed (i.e., the non-power generation stage), the current between the generator and the battery is cut off through the electronic switch unit circuit (i.e., the generator is in an unloaded state) to stop charging the battery. The output voltage of the generator in the unloaded state is dozens of times that of the loaded state voltage. Once the electronic switch unit circuit is damaged, it will cause instantaneous damage to a large number of components of the vehicle's electrical system. Due to this design defect, the automotive permanent magnet brushless generator cannot be widely applied.

[0005] The working principle of the generator is as follows: When the rotor magnetic field of the generator rotates, the rotor magnetic field forms a magnetic circuit through the stator core, causing the magnetic flux of the stator winding to change periodically with the rotation of the rotor, thereby generating alternating current in the stator winding.

[0006] Currently, the relative positions of the left and right claw poles (i.e., the left and right magnetic poles) of the rotor of the automotive permanent magnet generator are fixed, and 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 necessarily passes through the stator core. Also, since the power transmission between the engine and the generator uses a belt connection, the generator always rotates under the drive of the belt during engine operation. Therefore, the generator is always in the power generation state. Summary of the Invention

[0007] One 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, so as to achieve the purpose of controlling the working state of the permanent magnet generator.

[0008] Another object of the present invention is to provide a generator controlled by a magnetic circuit.

[0009] Still another object of the present invention is to provide a control system.

[0010] Yet another object of the present invention is to provide a control method.

[0011] To achieve the above objects, the present invention adopts the following technical solutions:

[0012] A rotor controlled by a magnetic circuit, with a stator provided on its outer periphery, and a predetermined-thickness air gap separating the rotor and the stator, comprising:

[0013] A rotor shaft;

[0014] A pair of claw poles, mounted on the rotor shaft, each claw pole having a plurality of pole claws extending axially and arranged circumferentially, the plurality of pole claws of the pair of claw poles being interlaced with each other circumferentially and forming a plurality of gaps arranged circumferentially. Shock-absorbing members with different thicknesses are installed on the pole claws in two circumferentially adjacent gaps. The shock-absorbing members include a first shock-absorbing member with a first thickness and a second shock-absorbing member with 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;

[0015] A permanent magnet ring, provided between the pair of claw poles;

[0016] A locking mechanism, enabling the claw poles to rotate synchronously with the rotor shaft and allowing the claw poles to rotate independently along the rotor shaft;

[0017] A braking mechanism, capable of braking any one of the pair of claw poles under the action of an external braking force.

[0018] As a preferred technical solution, the pair of claw poles includes a left claw pole and a right claw pole, and the first shock-absorbing member and the second shock-absorbing member are respectively installed on both sides of the pole claws of the left claw pole;

[0019] Alternatively, the first shock-absorbing member or the second shock-absorbing member is installed on one side of the pole claws of the left claw pole, and the second shock-absorbing member or the first shock-absorbing member is installed on one side of the pole claws of the right claw pole;

[0020] Alternatively, the first shock-absorbing member and the second shock-absorbing member are respectively installed on both sides of the pole claws of the right claw pole.

[0021] As a preferred technical solution, the shock-absorbing member is made of a non-magnetic material.

[0022] 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, and the magnetic material has a third thickness, and the third thickness is less than the second thickness;

[0023] When a predetermined pole claw is braked, the magnetic material causes two pole claws located on both sides of the second shock absorber to be connected into one body by the action of their own magnetic field force; when another predetermined pole claw is braked, the first shock absorber allows two pole claws located on both sides of the first shock absorber to be connected into one body by the action of their own magnetic field force.

[0024] As a preferred technical solution, the locking mechanism is arranged between the pole claw and the rotor shaft, and the locking mechanism includes an elastic member and a clamping body arranged at one end of the elastic member. The rotor shaft is provided with a receiving groove for receiving the elastic member, and the pole claw is provided with a clamping groove adapted to the clamping body, and the elastic member applies an elastic force to the clamping body to make the clamping body enter the clamping groove.

[0025] As a preferred technical solution, the elastic member is a spring or elastic rubber or a spring piece.

[0026] As a preferred technical solution, the braking mechanism includes a friction plate arranged on the pole claw and a brake shoe arranged corresponding to the friction plate.

[0027] A generator using magnetic circuit control includes the above-mentioned rotor.

[0028] A control system includes:

[0029] The above-mentioned generator;

[0030] A storage battery, connected to the generator;

[0031] An electronic control unit, connected to the storage battery to detect the output voltage of the storage battery;

[0032] A braking force providing member, connected to the electronic control unit, for providing a braking force for the braking mechanism to brake a predetermined pole claw, wherein the driving force providing member provides the driving force in a manner including hydraulic pressure, air pressure or magnetic field attraction.

[0033] A control method using magnetic circuit control includes the following steps:

[0034] Control the relative positions of two pole claws of the generator, and further 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.

[0035] The beneficial effects of the present invention include: by controlling the relative positions of the pole claws of a pair of claw poles of the generator rotor, the relative positions of a pair of claw poles of the generator rotor (i.e., the left and right magnetic poles) are controlled, so as to control whether the main magnetic circuit of the pair of claw poles flows through the stator core, and further achieve the purpose of controlling the working state of the permanent magnet generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the decomposed structure of the rotor according to an embodiment of the present invention;

[0037] Figure 2 Schematic side view structure diagram of the rotor according to an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the locking mechanism according to an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the installation position of the shock absorber according to an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the control system according to an embodiment of the present invention;

[0041] Figure 6 Flow chart of the control process of the control system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] For better understanding of the purpose, structure, features, and effects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] A generator according to an embodiment of the present invention includes a rotor and a stator (not shown) disposed outside the rotor across an air gap having a predetermined thickness.

[0044] As Figure 1 、 Figure 2 and Figure 3 shown, the rotor includes a rotor shaft 8, a pair of claw poles 1, 3 mounted on the rotor shaft 8, a permanent magnet ring 2 disposed between the pair of claw poles 1, 3, a locking mechanism that enables the claw poles 1, 3 to rotate synchronously with the rotor shaft 8 and allows the claw poles 1, 3 to rotate independently along the rotor shaft 8, and a braking mechanism that can brake any one of the pair of claw poles 1, 3 under the action of an external driving force.

[0045] The rotor shaft 8 is rotated by an external power source. For example, an engine (not shown) drives the rotor shaft 8 to rotate through a belt drive.

[0046] Each claw pole 1 or 3 has a plurality of pole claws 11, 12 that extend axially and are arranged circumferentially. The pole claws 11, 12 of a pair of claw poles 1, 3 are interlaced with each other circumferentially and form a plurality of gaps arranged circumferentially. A shock absorber with different thicknesses is installed in two circumferentially adjacent gaps on the pole claws 11 and / or 12. The shock absorber includes a first shock absorber 1-1 with a first thickness and a second shock absorber 1-2 with 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.

[0047] 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 one of the claw poles 1 or 3 is braked, the other claw pole 3 or 1 still rotates with the rotor shaft 8. Under the action of the attractive force, the pole claws 11, 12 of the two claw poles 1, 3 will eventually combine. However, due to the shock absorber installed in the gap, a predetermined distance will still be maintained between the combined pole claws 11, 12 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 different claw poles 1, 3 being braked, the pole claws 11, 12 may be combined with the first shock absorber 1-1 in between, or may be combined with the second shock absorber 1-2 in between.

[0048] The first thickness is predetermined to be less than the thickness of the air gap, which can prevent the main magnetic circuit from passing through the stator core. The second thickness is predetermined to be greater than the thickness of the air gap, which can allow the main magnetic circuit to pass through the stator core. Therefore, when the first shock absorber 1-1 is between the pole claws 11, 12, the main magnetic circuit does not pass through the stator core, and thus the generator is in an idling state (not generating electricity); when the second shock absorber 1-2 is between the pole claws 11, 12, the main magnetic circuit passes through the stator core, and thus the generator is in a generating 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, and thus achieve the purpose of controlling the operating state of the permanent magnet generator.

[0049] A pair of claw poles 1, 3 includes a left claw pole 1 and a right claw pole 3. The left claw pole 1 has left pole claws 11, and the right claw pole 3 has right pole claws 12. According to different embodiments, the first shock absorber 1-1 and the second shock absorber 1-2 can be respectively installed on both sides of the pole claws of the left claw pole 1 (i.e., both sides of the left pole claw 11). Alternatively, the first shock absorber 1-1 or the second shock absorber 1-2 can be installed on one side of the pole claws of the left claw pole 1 (i.e., one side of the left pole claw 11), and the second shock absorber 1-2 or the first shock absorber 1-1 can be installed on one side of the pole claws of the right claw pole 3 (i.e., one side of the right pole claw 12); or the first shock absorber 1-1 and the second shock absorber 1-2 can be respectively installed on both sides of the pole claws of the right claw pole 3 (i.e., both sides of the right pole claw 12).

[0050] In some embodiments, the damping member is a non-magnetic material, such as plastic, rubber, etc. Using a non-magnetic material 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.

[0051] In some embodiments, one end of the second damping member 1-2 is mounted on the claw pole, and the other end is provided with a magnetic material 1-3, such as iron, cobalt, nickel, etc. Since the thickness of the second damping member 1-2 is relatively thick, by providing the magnetic material 1-3, the magnetic material 1-3 can be attracted by the claw pole, which can further ensure that the left and right claw poles 11, 12 can be combined. The magnetic material 1-3 has a third thickness, and the third thickness is less than the second thickness, that is, the magnetic material 1-3 is relatively thin, such as an iron sheet, so that the attraction between the claw pole and the magnetic material 1-3 is not so large, and it is convenient to separate the two by braking.

[0052] In some embodiments, when a predetermined one of the claw poles 1 or 3 is braked, the magnetic material 1-3 causes the two claw poles 11, 12 located on both sides of the second damping member 1-2 to be connected into one body by their own magnetic field forces, that is, the magnetic material 1-3 plays an auxiliary attraction role, and the two claw poles 11, 12 are mainly attracted to each other by their own magnetic field forces; when the other predetermined claw pole 3 or 1 is braked, the first damping member 1-1 allows the two claw poles 11, 12 located on both sides of the first damping member 1-1 to be connected into one body by their own magnetic field forces. In order to ensure that the two claw poles 11, 12 on both sides of the first damping member 1-1 can attract each other by themselves, the first damping member 1-1 needs to have a relatively thin thickness, so the first damping member 1-1 is preferably a damping film.

[0053] Figure 3 The locking mechanism of the claw poles 1, 3 is shown. The locking mechanism is provided between the claw poles 1, 3 and the rotor shaft 8. The locking mechanism includes an elastic member 9 and a clamping 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, 3 are provided with a clamping groove 14 adapted to the clamping body 10. The clamping groove 14 is arranged circumferentially, and the elastic member 9 applies an elastic force to the clamping body 10 to make the clamping body 10 enter the clamping groove 14. The elastic member 9 is a spring, elastic rubber, elastic sheet or other object capable of applying an elastic force. The clamping body 10 can be a steel ball, an iron ball or other object with a suitable structure.

[0054] When one of the claw poles 1 or 3 is braked, the claw pole 1 or 3 rotates relative to the rotor shaft 8. During this process, the claw pole 1 or 3 presses down the clamping body 10, and the elastic member 9 is compressed at the same time. At this time, the claw pole 1 or 3 can rotate without being restricted by the rotor shaft 8. When the driving force disappears, under the elastic force of the elastic member 9, the clamping body 10 is bounced up and re-engaged into the clamping groove. At this time, the claw poles 1, 3 rotate together with the rotor shaft 8.

[0055] The braking mechanism includes a friction plate provided on the claw pole and a brake shoe provided corresponding to the friction plate. The brake shoe can brake the corresponding claw pole by contacting and rubbing against the friction plate under the action of an external driving force. The left friction plate 6 is located on the left claw pole 1, the right friction plate 4 is located on 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.

[0056] Figure 4 An embodiment is shown in which the first shock absorber 1-1 and the second shock absorber 1-2 are respectively installed on both sides of the claw of the left claw pole 1. In this embodiment, the first shock absorber 1-1 is installed on the upper side of the claw of the left claw 11, and the second shock absorber 1-2 is installed on the lower side of the claw of the right claw 12. Of course, in other embodiments, the installation positions of the first shock absorber 1-1 and the second shock absorber 1-2 can be interchanged.

[0057] According to Figure 4 , the arrow indicates the rotation direction of the rotor shaft 8. When the left claw pole 1 is instantaneously braked, the upper side of the claw of the left claw 11 is combined with the lower side of the claw of the right claw 12, and because the two claw poles are opposite magnetic poles, there is an attractive force between them, and this attractive force can prevent them 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 (i.e., the gap between the rotor and the stator), at this time, the main magnetic path formed by the left and right claw poles 1, 3 through their respective claws 11, 12 does not pass through the stator core. When the driving force disappears, under the action of the locking mechanism, the left and right claw poles 1, 3 rotate synchronously with the rotor shaft 8. At this time, since the main magnetic path 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).

[0058] That is: instantaneously braking the left claw pole 1 of the generator rotor can make the generator in an idling state.

[0059] When the right claw pole 3 is instantaneously braked, the lower side of the claw of the left claw 11 is combined with the upper side of the claw of the right claw 12, and because the magnetic material 1-3 is attracted by the right claw 12, this attractive force can prevent them 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 (i.e., the gap between the rotor and the stator), at this time, the left and right claw poles 1, 3 form a main magnetic path through the stator core. When the driving force disappears, under the action of the locking mechanism, the left and right claw poles 1, 3 rotate synchronously with the rotor shaft 8. At this time, since the main magnetic path passes through the stator core. Therefore, the generator is in a generating state.

[0060] That is: instantaneously braking the right claw pole 3 of the generator rotor can make the generator in a generating state.

[0061] Such as Figure 5As shown in the figure, the present invention also provides a control system, which includes the above-mentioned generator GEN, a storage battery BATT connected to the generator GEN, an electronic control unit ECU connected to the storage battery BATT, a driving force providing member connected to the electronic control unit ECU, a load L connected to the storage battery BATT, and a isolation diode D connected to the storage battery BATT.

[0062] The load L represents all loads of the vehicle electrical system. In this embodiment, the driving force providing member is an electromagnet, which provides a driving force to a braking mechanism by magnetic attraction to brake a predetermined claw pole, that is, drives the brake shoe to contact the friction plate for braking. In other embodiments, hydraulic or pneumatic or other suitable means may also be used to provide the driving force. The electromagnet includes a first braking electromagnet M1 for braking the right claw pole 3 and a second braking electromagnet M2 for braking the left claw pole 1.

[0063] The G terminal of the isolation diode D is connected to the generator GEN, its B terminal is connected to the storage battery BATT, and the electronic control unit ECU is also connected to its G terminal and B terminal. The electronic control unit ECU collects the output voltage of the generator GEN at the G point on the left end of the isolation diode D and the voltage signal of the storage battery BATT at the B point on its right end to judge the current charging status of the storage battery BATT, and controls the electromagnet to realize the claw pole combination state of the left and right claw poles 1 and 3, so as to achieve the control of the working state of the generator GEN.

[0064] As Figure 6 shown, the control of the working state of the automotive generator GEN mainly includes the following three stages (taking 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):

[0065] (1) Start charging stage

[0066] After the engine is started, the electronic control unit ECU instantaneously energizes the first braking electromagnet M1 to instantaneously brake the right claw pole 3 of the rotor of the generator GEN, so that the generator GEN is in the power generation state to charge the storage battery BATT. In the start charging stage, the electronic control unit ECU detects the output voltage of the storage battery BATT by detecting the potential at the B point on the right end of the isolation diode D. When the potential at the B point is greater than or equal to a certain predetermined value (14.5V in this embodiment), the start charging stage ends.

[0067] (2) Storage battery BATT discharge stage

[0068] After the start charging stage is completed, the electronic control unit ECU instantaneously energizes the second braking electromagnet M2, instantaneously braking the left claw pole 1 of the generator GEN rotor, making the generator GEN in an idling state, and the battery BATT enters the discharging stage. When the potential at point B is less than or equal to a certain predetermined value (13.0V in this embodiment), the discharging stage terminates.

[0069] (3) Secondary charging stage

[0070] After the discharging stage of the battery BATT is completed, the electronic control unit ECU instantaneously energizes the braking electromagnet M1, making the generator GEN 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 (14.5V in this embodiment), it enters the discharging stage of the battery BATT again. It circulates like this until the engine stops running.

[0071] The present invention also provides a control method using magnetic circuit control, including the following steps:

[0072] Control the relative positions 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, thereby controlling the working state of the generator.

[0073] The above detailed description is only an illustration of the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the content of this creation specification and drawings are included in the patent scope of this creation.

Claims

1. A rotor using magnetic circuit control, with a stator provided on its outer periphery, and a predetermined-thickness air gap is provided between the rotor and the stator, characterized in that, Comprising: A rotor shaft; A pair of claw poles, mounted on the rotor shaft, each claw pole having a plurality of pole claws extending axially and arranged circumferentially, the plurality of pole claws of the pair of claw poles being interlaced with each other circumferentially and forming a plurality of gaps arranged circumferentially, damping members with different thicknesses mounted on the pole claws being provided in two circumferentially adjacent gaps, the damping members including a first damping member having a first thickness and a second damping member having a second thickness, the first thickness being less than the thickness of the air gap, and the second thickness being greater than the thickness of the air gap; A permanent magnet ring, disposed between the pair of claw poles; A locking mechanism disposed between the claw pole and the rotor shaft, which includes an elastic member and a clamping body disposed at one end of the elastic member, enabling the claw pole to rotate synchronously with the rotor shaft and allowing the claw pole to rotate independently along the rotor shaft; A braking mechanism, which includes a friction plate disposed on the claw pole and a brake shoe corresponding to the friction plate, the brake shoe being capable of contacting and frictional with the friction plate under the action of an external driving force to brake any one of the pair of claw poles.

2. The rotor using magnetic circuit control according to claim 1, characterized in that: 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 respectively mounted on both sides of the pole claws of the left claw pole; Alternatively, the first damping member or the second damping member is mounted on one side of the pole claws of the left claw pole, and the second damping member or the first damping member is mounted on one side of the pole claws of the right claw pole; Alternatively, the first damping member and the second damping member are respectively mounted on both sides of the pole claws of the right claw pole.

3. The rotor using magnetic circuit control according to claim 1, characterized in that: The damping member is a non-magnetic material.

4. The rotor using magnetic circuit control according to claim 3, wherein: One end of the second damping member is mounted on the pole claw, and the other end is provided with a magnetic material, the magnetic material having a third thickness, and the third thickness being less than the second thickness; When a predetermined claw pole is braked, the magnetic material causes the two pole claws located on both sides of the second damping member to be connected into one body by the action of their own magnetic field force; when another predetermined claw pole is braked, the first damping member allows the two pole claws located on both sides of the first damping member to be connected into one body by the action of their own magnetic field force.

5. The rotor with magnetic circuit control according to claim 1, characterized in that: The rotor shaft is provided with a receiving groove for receiving the elastic member, the claw pole is provided with a card slot adapted to the clamping body, and the elastic member applies an elastic force to the clamping body to cause the clamping body to enter the card slot.

6. The rotor using magnetic circuit control according to claim 5, characterized in that: The elastic member is a spring or an elastic rubber or an elastic sheet.

7. A generator using magnetic circuit control, characterized in that, Including the rotor according to any one of claims 1 to 6.

8. A control system, characterized in that, Comprising: The generator according to claim 7; A storage battery, connected to the generator; An electronic control unit, connected to the storage battery to detect the output voltage of the storage battery; A driving force providing member, connected to the electronic control unit, for providing a driving force for the braking mechanism to brake a predetermined claw pole, wherein the driving force providing member provides the driving force in a manner including hydraulic pressure, pneumatic pressure or magnetic attraction.

9. A control method for magnetic circuit control using the control system according to claim 8, characterized in that, Including the following steps: Controlling the relative positions of the two claw poles of the generator, and further controlling whether the main magnetic path of the rotor magnetic field flows through the stator, so as to control the working state of the generator.

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