Adjustable and closable electric control permanent magnetic field device and method

Abstract

The adjustable and closable electric control permanent magnetic field device comprises a permanent magnet and is characterized in that an electromagnet is fixed on the outer ring of the permanent magnet, a magnet exciting coil is wound on the electromagnet, the permanent magnet is demagnetized firstly, then after the device is transported and installed, a strong pulse power supply is connected to the magnet exciting coil, the permanent magnet is magnetized by the electromagnet, and the permanent magnet is demagnetized by the electromagnet. After magnetizing is completed, a strong pulse power supply is cut off, no current input of the electromagnet is kept, the permanent magnet continuously generates a stable permanent magnetic field, during magnetizing, a constant excitation magnetic field is achieved by outputting constant current, the higher the current is, the higher the magnetic field intensity is, different magnetizing intensities, online magnetizing and demagnetizing are achieved by adjusting different currents, and the higher the magnetizing intensity is achieved by magnetizing through the strong pulse magnetic field. The magnetizing and demagnetizing intensity is adjusted through the magnet exciting coil, the current is adjusted through the magnet exciting coil, then the magnetizing and demagnetizing intensity is adjusted, non-magnetizing transportation and installation are achieved, and transportation equipment and on-site use equipment are not affected.

Description

Technical Field

[0001] This invention relates to the field of permanent magnetic field devices, specifically an adjustable and shut-off electrically controlled permanent magnetic field device and method. Background Technology

[0002] Existing permanent magnetic field devices cannot adjust the air gap strength or shut off the air gap magnetic field, causing the following problems: 1. They cannot be adjusted when different air gap magnetic field strengths are required. 2. The magnetic field cannot be shut off during transportation and is always external, resulting in a low safety factor. 3. During installation, the magnetic field is always external, leading to a low safety factor and low installation efficiency. If an electromagnet is used, it must be constantly energized to maintain its magnetism, consuming a large amount of electrical energy during operation. Extensive research has been conducted on this issue. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an adjustable and shut-off electrically controlled permanent magnetic field device and method, which realizes an adjustable and shut-off permanent magnetic field. In use, by magnetizing the permanent magnetic field, the electromagnet is avoided from being continuously energized, thus consuming no electrical energy.

[0004] This invention is achieved through the following technical solution: An adjustable and shut-off electrically controlled permanent magnetic field device and method of this invention includes a permanent magnet, characterized in that an electromagnet is fixed on the outer ring of the permanent magnet, and an excitation coil is wound on the electromagnet. The permanent magnet is first demagnetized, and then after the device is transported and installed, a strong pulse power supply is connected to the excitation coil to magnetize the permanent magnet by the electromagnet. After the magnetization is completed, the strong pulse power supply is disconnected to keep the electromagnet without current input, and the permanent magnet continuously generates a stable permanent magnetic field.

[0005] A further technical solution is that the permanent magnet includes an S-pole permanent magnet and an N-pole permanent magnet, and an electromagnet is fixed around the outer ring of the S-pole permanent magnet and the N-pole permanent magnet.

[0006] In a further technical solution, the excitation coil is connected to a high-pulse power supply to demagnetize the permanent magnet.

[0007] A further technical solution is to use a DC power supply for the high-pulse power supply.

[0008] A further technical solution involves adjusting the current through the excitation coil to regulate the magnetization and demagnetization intensity.

[0009] A further technical solution involves achieving a constant excitation magnetic field during magnetization by outputting a constant current. The greater the current, the stronger the magnetic field. Different magnetization intensities can be achieved by adjusting different currents.

[0010] A further technical solution involves using a thyristor to demagnetize the permanent magnet with an alternating large current or by reversing magnetization to achieve demagnetization or magnetic circuit switching.

[0011] The working method of this device includes the following steps: First, the permanent magnet is demagnetized by using a large alternating current through a thyristor before leaving the factory; second, the device is transported and installed; third, the current is adjusted by the excitation coil, thereby adjusting the charging and demagnetizing intensity, and the permanent magnet is charged with different intensities by an electromagnet.

[0012] The beneficial effects of this invention are: 1. Online magnetization and demagnetization: Magnetization is performed using a strong pulsed magnetic field, supporting online magnetization and demagnetization. The magnetization uses a strong pulsed magnetic field, and the time for a single magnetization is short, which is suitable for the needs of rapid on-site debugging.

[0013] The magnetization and demagnetization intensity is adjusted by regulating the excitation coil, which in turn adjusts the current.

[0014] Non-magnetic transportation and installation have no impact on transportation equipment or equipment used on site.

[0015] Fourth, since there is no need to consider the influence of the permanent magnetic field on other objects, the transportation and installation efficiency is high.

[0016] 5. By setting an adjustable and switchable permanent magnetic field, after installation and magnetization, the permanent magnetic field is kept on. Compared with electromagnetic fields, subsequent work does not consume electrical energy. Attached Figure Description

[0017] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of an adjustable and shut-off electrically controlled permanent magnetic field device according to the present invention. Detailed Implementation

[0019] like Figure 1 As shown, the present invention will be described in detail. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The projected directions are consistent in all directions (up, down, left, right, front, back). This invention provides an adjustable and closable electrically controlled permanent magnetic field device, comprising a permanent magnet, including an S-pole permanent magnet and an N-pole permanent magnet. An electromagnet is fixed around the outer ring of the S-pole and N-pole permanent magnets, and an excitation coil is wound around the electromagnet. The excitation coil is connected to a high-pulse power supply and is demagnetized before leaving the factory. After the device is transported and installed, the high-pulse power supply is connected to the excitation coil, and the permanent magnet is magnetized by the electromagnet.

[0020] Beneficially, the high-pulse power supply is a DC power supply.

[0021] Beneficially, the charging and demagnetizing intensity is adjusted by the excitation coil. The excitation coil adjusts the charging and demagnetizing intensity by adjusting the magnitude of the current. The peak value and duration of the input current are adjusted by the excitation coil, thereby adjusting the charging and demagnetizing intensity: During charging, the larger the peak value of the current and the longer the duration, the stronger the final magnetic field strength of the permanent magnet; during demagnetizing, the larger the amplitude and the higher the frequency of the alternating current, the more thorough the demagnetizing.

[0022] Advantageously, during magnetization, a constant excitation magnetic field is achieved by outputting a constant current. The larger the current, the stronger the magnetic field. Different magnetization intensities can be achieved by adjusting different currents.

[0023] Advantageously, the system uses a strong pulse power supply to charge and demagnetize the magnetizer, and the power output is completed and then turned off, eliminating the need for continuous power supply and thus saving energy.

[0024] Beneficially, the permanent magnet is demagnetized by a silicon controlled rectifier (SCI), using alternating large current for demagnetization or by reverse magnetization, thereby switching the magnetic circuit from external magnetic field circulation to internal magnetic field circulation, thus making it non-magnetic to the outside.

[0025] The working method of this device is an electrically controlled permanent magnet scheme, which uses an excitation coil for timely magnetization and demagnetization, including: First, at the factory, the permanent magnet is demagnetized by a large alternating current through a thyristor; Second, the device is transported and installed; Third, the current is adjusted by the excitation coil, thereby adjusting the magnetization and demagnetization intensity, and the permanent magnet is magnetized at different intensities by an electromagnet.

[0026] In the third step, the peak value of the input current is adjusted by the excitation coil according to actual needs, thereby adjusting the magnetization intensity. The permanent magnet is precisely magnetized by the electromagnet, so that the permanent magnet outputs the target magnetic field strength.

[0027] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without creative effort should be included within the scope of protection of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An adjustable and shut-off electrically controlled permanent magnetic field device, comprising a permanent magnet, characterized in that, An electromagnet is fixed to the outer ring of the permanent magnet, and an excitation coil is wound on the electromagnet. The permanent magnet is first demagnetized. After the device is transported and installed, a strong pulse power supply is connected to the excitation coil to magnetize the permanent magnet. After the magnetization is completed, the strong pulse power supply is disconnected to keep the electromagnet without current input, and the permanent magnet continuously generates a stable permanent magnetic field.

2. The adjustable and shut-off electrically controlled permanent magnetic field device according to claim 1, characterized in that: The permanent magnet includes an S-pole permanent magnet and an N-pole permanent magnet, and an electromagnet is fixed around the outer ring of the S-pole permanent magnet and the N-pole permanent magnet.

3. The adjustable and shut-off electrically controlled permanent magnetic field device according to claim 1, characterized in that: The high-pulse power supply is a DC power supply.

4. The adjustable and shut-off electrically controlled permanent magnetic field device according to claim 1, characterized in that: The magnetization and demagnetization intensity can be adjusted by regulating the current through the excitation coil.

5. The adjustable and shut-off electrically controlled permanent magnetic field device according to claim 4, characterized in that: During magnetization, a constant excitation magnetic field is achieved by outputting a constant current. The larger the current, the stronger the magnetic field. Different magnetization intensities can be achieved by adjusting different currents.

6. The adjustable and shut-off electrically controlled permanent magnetic field device according to claim 1, characterized in that: Permanent magnets are demagnetized using alternating large currents via thyristors.

7. The operating method of an adjustable and lockable electrically controlled permanent magnetic field device according to any one of claims 1-6, characterized in that: The first step is to demagnetize the permanent magnet using a large alternating current via a thyristor before shipping. The second step is to transport and install the device. The third step is to adjust the current through the excitation coil, thereby adjusting the magnetization and demagnetization intensity, and using an electromagnet to magnetize the permanent magnet at different intensities.

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