Magnet charging circuit and magnet charging system

Abstract

The application relates to a magnetizing circuit and a magnetizing system, wherein the magnetizing circuit comprises a charging circuit, an energy storage circuit, a discharging circuit, a magnetizing coil and a power feedback circuit. Since the power feedback circuit can feed back reverse power stored in the energy storage circuit to the forward voltage of the energy storage circuit after the completion of the magnetizing operation of the rotor of a permanent magnet device, the energy storage circuit can store the residual energy after the magnetizing operation, and thus, the energy storage circuit can be supplemented with part of the power to perform the magnetizing operation on the next magnetic pole, the residual energy after the magnetizing operation is effectively utilized, and the charging of the permanent magnet device from zero is not needed, so that the magnetizing time of the permanent magnet device is shortened, the magnetizing efficiency of the permanent magnet device is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of magnetization technology, and in particular to magnetization circuits and magnetization systems. Background Technology

[0002] Wind power generation is one of the emerging industries in the power sector. Driven by both policy and market demand, my country's wind power-related industries have achieved rapid development and have become an important component of the new energy system. Permanent magnet wind turbines have advantages such as high efficiency, simple structure, and high power density, and are often the preferred units for large-scale onshore and offshore wind power generation equipment. The rotor of a permanent magnet wind turbine generally has a multi-stage structure, typically with 60 to 120 poles, with each pole consisting of multiple permanent magnets placed side by side.

[0003] Before being put into operation, the rotor of a permanent magnet wind turbine needs to be magnetized. Generally, the entire permanent magnet wind turbine is magnetized, meaning each stage of the rotor is magnetized individually. However, this magnetization method requires recharging the energy storage circuit after one pole is magnetized and before the next pole is magnetized. Therefore, each magnetization operation requires a relatively long charging wait time, typically tens of seconds to several minutes. For some high-power permanent magnet devices, especially permanent magnet wind turbines with multi-pole structures, the overall rotor magnetization operation takes a long time and has low magnetization efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a magnetization circuit and magnetization system to address the aforementioned technical problems, so as to shorten the magnetization time of permanent magnet devices and improve magnetization efficiency.

[0005] This application provides a magnetization circuit, the magnetization circuit comprising:

[0006] Charging circuit, used to provide charging voltage;

[0007] An energy storage circuit, connected to the charging circuit, is used to charge the device according to the charging voltage and store electrical energy.

[0008] A discharge circuit, connected to the energy storage circuit, is used to discharge the electrical energy stored in the energy storage circuit and generate a pulse current.

[0009] A magnetizing coil, connected to the discharge circuit, is used to generate a pulsed magnetic field under the action of the pulsed current; wherein the pulsed magnetic field is used to magnetize the rotor of the permanent magnet device.

[0010] The energy feeding circuit is connected to the energy storage circuit and the discharge circuit respectively. After the magnetization operation of the rotor of the permanent magnet device is completed, the reverse electrical energy stored in the energy storage circuit is fed back to the positive voltage of the energy storage circuit so that the energy storage circuit stores the remaining energy after the magnetization operation.

[0011] In one embodiment, the power supply circuit includes a power supply inductor and a power supply switch connected in series; wherein the power supply inductor and the power supply switch are both connected in series with the energy storage circuit, and the power supply switch is also connected in parallel with the discharge circuit.

[0012] In one embodiment, the discharge circuit includes:

[0013] A first discharge switch, the first end of the first discharge switch is connected to the power feeding inductor and the first end of the power feeding switch respectively, and the second end of the first discharge switch is connected to the first end of the magnetizing coil;

[0014] A second discharge switch, the first end of which is connected to the second end of the power supply switch, and the second end of which is connected to the first end of the magnetizing coil;

[0015] The third discharge switch has its first end connected to the power supply inductor and the first end of the power supply switch, and its second end connected to the second end of the magnetizing coil.

[0016] A fourth discharge switch, the first end of which is connected to the second end of the power supply switch, and the second end of which is connected to the second end of the magnetizing coil.

[0017] In one embodiment, when the first discharge switch and the fourth discharge switch are closed, and the second discharge switch and the third discharge switch are open, the energy storage circuit, the energy feeding inductor, the first discharge switch, the magnetizing coil and the third discharge switch form a circuit to magnetize the N pole of the rotor of the permanent magnet device.

[0018] In one embodiment, when the first discharge switch and the fourth discharge switch are open, and the second discharge switch and the third discharge switch are closed, the energy storage circuit, the energy feeding inductor, the second discharge switch, the magnetizing coil and the third discharge switch form a circuit to magnetize the S pole of the rotor of the permanent magnet device.

[0019] In one embodiment, the energy storage circuit includes:

[0020] At least one pulse capacitor is connected to the charging circuit and the power supply circuit respectively, and is used to charge and store electrical energy according to the charging voltage.

[0021] In one embodiment, the energy storage circuit includes a plurality of pulse capacitors connected in parallel.

[0022] In one embodiment, the energy storage circuit further includes:

[0023] At least one inductor, and each inductor is connected in series with each pulse capacitor.

[0024] In one embodiment, the charging circuit includes a first relay, a second relay, and a charging module connected in series; wherein,

[0025] The charging module is used to provide the charging voltage;

[0026] When the first relay and the second relay are closed, the charging path between the charging module and the energy storage circuit is opened.

[0027] This application embodiment also provides a magnetization system, characterized in that the magnetization system includes:

[0028] Permanent magnet equipment to be magnetized;

[0029] The magnetizing circuit described in any of the above embodiments; wherein the magnetizing circuit is used to magnetize the rotor of the permanent magnet device.

[0030] The magnetization circuit and magnetization system provided in the above embodiments include a charging circuit, an energy storage circuit, a discharging circuit, a magnetization coil, and a feeding circuit. Since the feeding circuit can feed back the reverse electrical energy stored in the energy storage circuit to the positive voltage of the energy storage circuit after the magnetization operation of the rotor of the permanent magnet equipment is completed, so that the energy storage circuit can store the remaining energy after the magnetization operation, the energy storage circuit can be supplemented with some electrical energy to magnetize the next magnetic pole, effectively utilizing the remaining energy after magnetization without having to start charging from zero. This shortens the magnetization time of the permanent magnet equipment, improves the magnetization efficiency of the permanent magnet equipment, and thus improves production efficiency. Attached Figure Description

[0031] Figure 1 A schematic diagram of the magnetization circuit provided in one embodiment;

[0032] Figure 2 A schematic diagram of the magnetization circuit provided in another embodiment;

[0033] Figure 3 A schematic diagram of a permanent magnet device and a magnetizing coil provided in one embodiment;

[0034] Figure 4 A schematic diagram of the energy storage circuit provided in one embodiment;

[0035] Figure 5 A schematic diagram of the structure of a magnetization system provided in one embodiment;

[0036] Figure 6 A schematic flowchart of a magnetization method provided in one embodiment;

[0037] Figure 7 A schematic diagram of voltage and current waveforms in a magnetization circuit provided for one embodiment. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] As mentioned in the background section, the magnetization time for permanent magnet devices is relatively long and the magnetization efficiency is relatively low. Therefore, this application provides a magnetization circuit and a magnetization system to shorten the magnetization time of permanent magnet devices and improve the magnetization efficiency.

[0040] In one embodiment, such as Figure 1 As shown, a magnetization circuit is provided, which includes a charging circuit 10, an energy storage circuit 20, a discharging circuit 30, a magnetizing coil 40, and an energy feeding circuit 50. The discharging circuit 10 is used to provide the charging voltage.

[0041] The energy storage circuit 20 is connected to the charging circuit 10. The energy storage circuit 20 is used to charge according to the charging voltage provided by the charging circuit 10 and to store electrical energy. For example, if the permanent magnet device to be magnetized is a 2.5MW permanent magnet wind turbine, the capacity of the energy storage circuit 20 can be set to 1.92MJ. The capacity of the energy storage circuit 20 can be set according to the permanent magnet device to be magnetized, and no limitation is made here. For example, the rated voltage required for charging the energy storage circuit 20 can be preset, and charging can be stopped when the voltage across the energy storage circuit 20 reaches the rated voltage.

[0042] The discharge circuit 30 is connected to the energy storage circuit 20. The discharge circuit 30 discharges the electrical energy stored in the energy storage circuit 20 and generates a pulse current. The magnetizing coil 40 is connected to the discharge circuit 30. The magnetizing coil 40 generates a pulsed magnetic field under the action of the pulse circuit generated by the discharge circuit 30. This pulsed magnetic field is used to magnetize the rotor of the permanent magnet device. For example, the permanent magnet device can be a permanent magnet wind turbine. The energy feeding circuit 50 is connected to both the energy storage circuit 20 and the discharge circuit 30. After the magnetizing operation of the rotor of the permanent magnet device is completed, the energy feeding circuit 50 feeds the reverse electrical energy stored in the energy storage circuit 20 back to the forward voltage of the energy storage circuit 20, so that the energy storage circuit 20 stores the remaining energy after the magnetizing operation.

[0043] The magnetization circuit provided in the above embodiment includes a charging circuit 10, an energy storage circuit 20, a discharging circuit 30, a magnetizing coil 40, and an energy feeding circuit 50. Since the energy feeding circuit 50 can feed back the reverse electrical energy stored in the energy storage circuit 20 to the positive voltage of the energy storage circuit 20 after the magnetization operation of the rotor of the permanent magnet equipment is completed, so that the energy storage circuit 20 stores the remaining energy after the magnetization operation, the energy storage circuit 20 can be supplemented with some electrical energy to magnetize the next magnetic pole, which effectively shortens the magnetization time of the permanent magnet equipment, improves the magnetization efficiency of the permanent magnet equipment, and thus improves the production efficiency.

[0044] In one embodiment, such as Figure 2 As shown, the power supply circuit 50 includes a power supply inductor L1 and a power supply switch T5 connected in series. The power supply switch T5 is connected in series with the energy storage circuit 20, and the series branch of the power supply switch T5 and the energy storage circuit 20 is grounded. The power supply switch T5 is also connected in parallel with the discharge circuit 30.

[0045] The energy-feeding inductor L1 is connected in series with the energy storage circuit 20. During the magnetization operation, the energy-feeding inductor L1 acts as a protective inductor, limiting the output current of the energy storage circuit 20 and protecting the stored energy, thereby preventing the energy storage circuit 20 from exploding due to an output short circuit during the magnetization operation. During the energy feedback process, the energy-feeding inductor L1 acts as an energy feedback inductor, forming an energy feedback loop with the energy storage circuit 20, thereby recovering and utilizing the remaining energy after the magnetization operation, shortening the magnetization time of the permanent magnet device, and improving the magnetization efficiency. For example, the proportion of the feedback residual energy is about 80%. Therefore, before magnetizing the next magnetic pole, only 20% of the full charging time is needed to replenish the energy storage circuit 20 to the preset rated voltage. The replenishment time is generally less than 10 seconds, which greatly shortens the charging time, thereby shortening the magnetization time of the permanent magnet device and improving the magnetization efficiency.

[0046] Please continue reading. Figure 2In one embodiment, the discharge circuit 30 includes a first discharge switch T1, a second discharge switch T2, a third discharge switch T3, and a fourth discharge switch T4. The first terminal of the first discharge switch T1 is connected to the first terminals (i.e., non-grounded terminals) of the power supply inductor L1 and the power supply switch T5, respectively, and the second terminal of the first discharge switch T1 is connected to the first terminal of the magnetizing coil 40. The first terminal of the second discharge switch T2 is connected to the second terminal (i.e., grounded terminal) of the power supply switch T5, and the second terminal of the second discharge switch T2 is connected to the first terminal of the magnetizing coil 40. The first terminal of the third discharge switch T3 is connected to the first terminals of the power supply inductor L1 and the power supply switch T5, respectively, and the second terminal of the third discharge switch T3 is connected to the second terminal of the magnetizing coil 40. The first terminal of the fourth discharge switch T4 is connected to the second terminal of the power supply switch T5, and the second terminal of the fourth discharge switch T4 is connected to the second terminal of the magnetizing coil 40.

[0047] The magnetization circuit provided in the above embodiment includes a discharge circuit 30 comprising discharge switches T1 to T4, which enables the charging circuit between the energy storage circuit 20 and the magnetization coil 40 to be controlled by the discharge switches T1 to T4, facilitating the control and management of magnetization of the permanent magnet device.

[0048] Please continue reading. Figure 2 In one embodiment, when the first discharge switch T1 and the fourth discharge switch T4 are closed, and the second discharge switch T2 and the third discharge switch T3 are open, the energy storage circuit 20, the energy feeding inductor L1 (as a protective inductor) in the energy feeding circuit 50, the first discharge switch T1, the magnetizing coil 40, and the fourth discharge switch T4 form a circuit. The magnetizing coil 40 is subjected to a positive voltage, generating a positive pulse current and a pulse magnetic field, thereby magnetizing the N pole 611 of the rotor 610 of the permanent magnet device. (See also...) Figure 3 .

[0049] Please continue reading. Figure 2 and Figure 3 In one embodiment, when the first discharge switch T1 and the fourth discharge switch T4 are open, and the second discharge switch T2 and the third discharge switch T3 are closed, the energy storage circuit 20, the energy feeding inductor L1 (as a protective inductor) in the energy feeding circuit 50, the second discharge switch T2, the magnetizing coil 40, and the third discharge switch T3 form a circuit. The magnetizing coil 40 withstands a reverse voltage, generating a reverse pulse current and a pulse magnetic field, thereby magnetizing the S pole 612 of the rotor 610 of the permanent magnet device.

[0050] The magnetization circuit provided in the above embodiment uses a discharge circuit 30 composed of discharge switches T1 to T4 to realize the switching of the N pole and S pole of the rotor of the permanent magnet device during the magnetization process. This eliminates the additional mechanical action required to switch the magnetic poles using a polarity switching switch, reduces the operational complexity of the permanent magnet device during the magnetization process, and further improves the magnetization efficiency, especially for permanent magnet devices with multi-stage alternating settings.

[0051] In one embodiment, such as Figure 4 As shown, the energy storage circuit 20 includes at least one pulse capacitor C, which is connected to both the charging circuit 10 and the power supply circuit 50. Specifically, the pulse capacitor C can be connected in series with both the charging circuit 10 and the power supply circuit 50, while the charging circuit 10 and the power supply circuit 50 are connected in parallel. The pulse capacitor C is used to charge according to the charging voltage provided by the charging circuit 10 and store electrical energy, thus providing a basis for the magnetizing coil 40 to generate a pulsed magnetic field, so as to magnetize the permanent magnet device through the pulsed magnetic field.

[0052] Please continue reading. Figure 4 In one embodiment, the energy storage circuit 20 may include a plurality of pulse capacitors C connected in parallel. The number of pulse capacitors C can be set according to actual crimping requirements and is not limited herein. In this way, by setting multiple pulse capacitors C, a larger range of electrical energy can be stored, thereby generating a larger range of pulse magnetic fields to meet the magnetization requirements of the permanent magnet device.

[0053] Please continue reading. Figure 4 In one embodiment, the energy storage circuit 20 may further include at least one inductor L. Each inductor L is connected in series with each pulse capacitor C to form a capacitor bank. Specifically, each inductor L is grounded through the pulse capacitor C. Figure 2 The energy storage circuit 20 in the example uses a pulse capacitor C and an inductor L. In practical applications, the number of inductors L and the number of pulse capacitors C can be set according to the actual magnetization requirements, and no limitation is made here. In this way, the inductor L connected in series with the pulse capacitor C can prevent the pulse capacitor bank from exploding due to the failure of a single pulse capacitor C, thereby ensuring the safety and reliability of the magnetization process.

[0054] Please continue reading. Figure 2In one embodiment, the charging circuit 10 includes a first relay S1, a second relay S2, and a charging module 110 connected in series. The charging module 110 provides the charging voltage. The charging time of the energy storage circuit 20 is related to the power of the charging module 110, typically ranging from ten seconds to several minutes. When the first relay S1 and the second relay S2 are closed, the charging path between the charging module 110 and the energy storage circuit 20 is established, allowing the energy storage circuit 20 to charge and store electrical energy according to the charging voltage provided by the charging module 110. When the voltage across the energy storage circuit 20 reaches a set value, the first relay S1 and the second relay S2 can be disconnected, allowing the stored electrical energy in the energy storage circuit 20 to be discharged through the discharge circuit 30. For example, both the first relay S1 and the second relay S2 can be high-voltage relays.

[0055] In one embodiment, such as Figure 5 As shown, a magnetization system is provided, comprising a permanent magnet device 60 to be magnetized and a magnetization circuit as described in any of the above embodiments. The magnetization circuit includes a charging circuit 10, an energy storage circuit 20, a discharging circuit 30, a magnetizing coil 40, and an energy feeding circuit 50. The magnetization circuit is used to magnetize the rotor 610 of the permanent magnet device 60. The components of the magnetization circuit can be found in the relevant descriptions of the above embodiments, and will not be repeated here.

[0056] The magnetization system provided in the above embodiments includes a permanent magnet device to be magnetized and a magnetization circuit. The magnetization circuit magnetizes the rotor of the permanent magnet device. The magnetization circuit includes a charging circuit, an energy storage circuit, a discharging circuit, a magnetization coil, and a feeding circuit. Since the feeding circuit can feed back the reverse electrical energy stored in the energy storage circuit to the forward voltage of the energy storage circuit after the magnetization operation of the rotor of the permanent magnet device is completed, the energy storage circuit can store the remaining energy after the magnetization operation. Therefore, by supplementing the energy storage circuit with additional electrical energy, the next magnetic pole can be magnetized, effectively utilizing the remaining energy after magnetization without having to start charging from scratch. This shortens the magnetization time of the permanent magnet device, improves the magnetization efficiency of the permanent magnet device, and thus improves production efficiency.

[0057] To better understand, in conjunction with the above... Figure 2 and Figure 3 Taking a 2.5MW permanent magnet wind turbine rotor as an example, the magnetization process of the permanent magnet wind turbine rotor provided in the above embodiment is described. The rotor of the permanent magnet wind turbine has a diameter of 5 meters, a height of 1.5 meters, 42 pole pairs, and a total of 84 poles. Figure 6 As shown, the magnetization process may include the following steps S601 to S609.

[0058] S601: The rotor of the permanent magnet wind turbine rotates to the position to be magnetized, and the rated voltage of the capacitor bank is set to 20kV. High-voltage relays S1 and S2 are activated, and the charging module charges the capacitor bank. Charging time T1′ can be found in [reference needed]. Figure 7 In this context, curve ① represents the voltage U across the capacitor bank. c .

[0059] S602: After the voltage across the capacitor bank reaches the rated voltage, disconnect the high-voltage relay S1 and the high-voltage relay S2.

[0060] S603: Controls the first discharge switch T1 and the fourth discharge switch T4 to close, and the second discharge switch T2 and the third discharge switch T3 to open, causing the capacitor bank to discharge and generating a 22kA positive pulse current i1. The magnetizing coil forms a 4T positive pulse magnetic field, magnetizing the N pole. The discharge process can be found in [reference needed]. Figure 7 Curve ① in the figure, where the pulse current i1 flowing through the magnetizing coil can be found in the figure. Figure 7 Curve ② in the diagram.

[0061] S604: After the N-pole magnetization is complete, control switch T5 closes, and the capacitor bank recovers the remaining energy after magnetization. The energy feeding process can be found in [reference needed]. Figure 7 Curve ① in the figure, where the current i2 flowing through the power feeding inductor L can be found in the figure. Figure 7 Curve ③ in the diagram.

[0062] S605: Closes high-voltage relays S1 and S2, allowing the charging module to replenish power to the capacitor bank. The replenishment time T2′ can be found in [reference needed]. Figure 7 Curve ① in the figure indicates that the rotor rotates to the next position to be magnetized after time T3′.

[0063] S606: After the voltage across the capacitor bank reaches the rated voltage, disconnect high-voltage relays S1 and S2.

[0064] S607: Controls the first discharge switch T1 and the fourth discharge switch T4 to open, and the second discharge switch T2 and the third discharge switch T3 to close, causing the capacitor bank to discharge and generating a 22kA reverse pulse current i1. The magnetizing coil forms a 4T reverse pulse magnetic field, magnetizing the S pole. The discharge process can be found in [reference needed]. Figure 7 Curve ① in the figure, where the pulse current i1 flowing through the magnetizing coil can be found in the figure. Figure 7 Curve ② in the diagram.

[0065] S608: After the S pole is magnetized, the control switch T5 is closed, and the capacitor bank recovers the remaining energy after magnetization. The energy feeding process can be found in [reference needed]. Figure 7 Curve ① in the figure, where the current i2 flowing through the power feeding inductor L can be found in the figure. Figure 7 Curve ③ in the diagram.

[0066] S609: Close high-voltage relays S1 and S2, and the charging module replenishes the capacitor bank with power. Repeat steps S602 to S609 until all 84 magnetic poles of the 2.5MW permanent magnet wind turbine rotor are fully magnetized.

[0067] The magnetization method provided in the above embodiments allows the energy feeding circuit to feed back the reverse electrical energy stored in the energy storage circuit to the forward voltage of the energy storage circuit after the magnetization operation of the rotor of the permanent magnet equipment is completed. This enables the energy storage circuit to store the remaining energy after the magnetization operation. Therefore, by supplementing the energy storage circuit with some electrical energy, the next magnetic pole can be magnetized. This effectively utilizes the remaining energy after magnetization without having to start charging from scratch. This shortens the magnetization time of the permanent magnet equipment, improves the magnetization efficiency of the permanent magnet equipment, and thus improves production efficiency.

[0068] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A magnetizing circuit, characterized in that, The magnetization circuit includes: Charging circuit, used to provide charging voltage; An energy storage circuit, connected to the charging circuit, is used to charge the device according to the charging voltage and store electrical energy. A discharge circuit, connected to the energy storage circuit, is used to discharge the electrical energy stored in the energy storage circuit and generate a pulse current. A magnetizing coil, connected to the discharge circuit, is used to generate a pulsed magnetic field under the action of the pulsed current; wherein, the pulsed magnetic field is used to magnetize the rotor of the permanent magnet device; the permanent magnet device includes multiple magnetic poles, including N poles and S poles; the pulsed current includes a forward pulsed current and a reverse pulsed current, the forward pulsed current is used to magnetize the N pole of the rotor, and the reverse pulsed current is used to magnetize the S pole of the rotor; A power supply circuit, connected to both the energy storage circuit and the discharge circuit, is used to feed back the reverse electrical energy stored in the energy storage circuit to the forward voltage of the energy storage circuit after the magnetization operation of the rotor of the permanent magnet device is completed, so that the energy storage circuit stores the remaining energy after the magnetization operation. The power supply circuit includes a power supply inductor and a power supply switch connected in series. The power supply inductor and the power supply switch are both connected in series with the energy storage circuit, and the power supply switch is also connected in parallel with the discharge circuit. The power supply inductor is used as a protective inductor during the magnetization operation to limit the output current of the energy storage circuit and protect the energy storage circuit. The power supply inductor is also used as an energy feedback inductor during the energy feedback process, forming a power supply loop with the energy storage circuit to recover and utilize the remaining energy after the magnetization operation.

2. The magnetizing circuit according to claim 1, characterized in that, The discharge circuit includes: A first discharge switch, the first end of the first discharge switch is connected to the power feeding inductor and the first end of the power feeding switch respectively, and the second end of the first discharge switch is connected to the first end of the magnetizing coil; A second discharge switch, the first end of which is connected to the second end of the power supply switch, and the second end of which is connected to the first end of the magnetizing coil; The third discharge switch has its first end connected to the power supply inductor and the first end of the power supply switch, and its second end connected to the second end of the magnetizing coil. A fourth discharge switch, the first end of which is connected to the second end of the power supply switch, and the second end of which is connected to the second end of the magnetizing coil.

3. The magnetizing circuit according to claim 2, characterized in that, When the first discharge switch and the fourth discharge switch are closed, and the second discharge switch and the third discharge switch are open, the energy storage circuit, the energy feeding inductor, the first discharge switch, the magnetizing coil, and the third discharge switch form a circuit to magnetize the N pole of the rotor of the permanent magnet device.

4. The magnetizing circuit according to claim 2, characterized in that, When the first discharge switch and the fourth discharge switch are disconnected, and the second discharge switch and the third discharge switch are closed, the energy storage circuit, the energy feeding inductor, the second discharge switch, the magnetizing coil, and the third discharge switch form a circuit to magnetize the S pole of the rotor of the permanent magnet device.

5. The magnetizing circuit according to claim 1, characterized in that, The energy storage circuit includes: At least one pulse capacitor is connected to the charging circuit and the power supply circuit respectively, and is used to charge and store electrical energy according to the charging voltage.

6. The magnetizing circuit according to claim 5, characterized in that, The energy storage circuit includes multiple pulse capacitors connected in parallel.

7. The magnetizing circuit according to claim 5, characterized in that, The energy storage circuit also includes: At least one inductor, and each inductor is connected in series with each pulse capacitor.

8. The magnetizing circuit according to claim 1, characterized in that, The charging circuit includes a first relay, a second relay, and a charging module connected in series; wherein... The charging module is used to provide the charging voltage; When the first relay and the second relay are closed, the charging path between the charging module and the energy storage circuit is opened.

9. The magnetizing circuit according to claim 8, characterized in that, When the voltage across the energy storage circuit reaches a set value, the first relay and the second relay are disconnected.

10. A magnetization system, characterized in that, The magnetization system includes: Permanent magnet equipment to be magnetized; The magnetizing circuit as described in any one of claims 1-9; wherein the magnetizing circuit is used to magnetize the rotor of the permanent magnet device.

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