Device and measurement method for measuring magnetic flux of single permanent magnet in magnetic group

Abstract

The present invention discloses a device for measuring the magnetic flux of a single permanent magnet in a magnetic assembly, which comprises a base, a limiting device and a magnetic flux measuring device; the limiting device is cylindrical and is used to limit the position of the magnetic assembly to be measured during measurement; the magnetic flux measuring device comprises a positioning magnetic conductor, a measuring coil and a magnetic flux meter; the positioning magnetic conductor is fixed on the limiting device, and the position of the positioning magnetic conductor corresponds to the position of the single permanent magnet in the magnetic assembly to be measured; the measuring coil is wound around the positioning magnetic conductor; the measuring coil is electrically connected to the magnetic flux meter and is used to display the magnetic flux sensed by the measuring coil. Thus, the device for measuring the magnetic flux of a single permanent magnet in a magnetic assembly according to the present invention can measure the magnetic flux of a single permanent magnet in an assembled magnetic assembly. The present invention also discloses a method for measuring the magnetic flux of a single permanent magnet in a magnetic assembly.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic applications, and particularly to a device and a measurement method for measuring the magnetic flux of a single magnet in a magnetic assembly. Background Art

[0002] In a permanent magnet motor, a magnet component (including a permanent magnet core rotor, etc.) is assembled by multiple magnets. The magnetic flux of the magnet is the key to affecting the performance of the motor. Due to the mutual influence between magnets, it is impossible to separately distinguish the magnetic field boundaries of each magnet. Especially when adjacent magnets have the same polarity, currently, the magnetic flux measurement is only for measuring the magnetic flux of the entire magnetic assembly component, and it is impossible to analyze the magnetic flux of a single magnet in the assembled magnetic group. When the motor undergoes demagnetization or abnormal magnetization, it is impossible to determine which magnet has a fault, and thus it is impossible to accurately analyze the cause of the motor abnormality.

[0003] When the magnetic assembly is applied to a motor, the measurement by the motor factory for the magnetic assembly is generally to measure the overall magnetic flux or torque value of the magnetic assembly. If the magnetic flux of a certain magnet is low while the magnetic fluxes of the other magnets are high, there will be an omission detection phenomenon where the overall magnetic flux is detected as qualified. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for measuring the magnetic flux of a single magnet in a magnetic assembly.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] A device for measuring the magnetic flux of a single magnet in a magnetic assembly includes a base, a limiting device, and a magnetic flux measurement device;

[0007] The limiting device is cylindrical and fixed on the base, and is used to limit the position of the magnetic assembly to be measured during measurement;

[0008] The magnetic flux measurement device includes a positioning magnetic conductor, a measuring coil, and a magnetic flux meter;

[0009] The positioning magnetic conductor is fixed on the limiting device. When the magnetic assembly to be measured is assembled in place, the position of the positioning magnetic conductor corresponds to the position of the single magnet in the magnetic assembly to be measured;

[0010] The measuring coil is wound around the positioning magnetic conductor and is used to sense the magnetic flux;

[0011] The measuring coil is electrically connected to the magnetic flux meter and is used to display the magnetic flux sensed by the measuring coil.

[0012] Compared with the prior art, the present invention has the following technical effects:

[0013] The structure of the present invention is simple and it is convenient to apply. It can effectively and quickly measure the magnetic flux of each single magnetic steel in the magnetic component group.

[0014] On the basis of the above technical solution, the present invention can also be improved as follows.

[0015] Preferably, a positioning groove adapted to the shape and size of the single magnetic steel in the magnetic component group to be measured is provided at one end of the positioning magnetic conductor in contact with the single magnetic steel in the magnetic component group to be measured.

[0016] The beneficial effect of adopting the above further solution is that all magnetic force lines of the single magnetic steel can be collected, and the measurement is more accurate.

[0017] Preferably, the cross-sectional area of the positioning magnetic conductor is greater than or equal to the cross-sectional area of the single magnetic steel in the magnetic component group to be measured.

[0018] The beneficial effect of adopting the above further solution is that the magnetic conduction effect is good, and the accuracy rate of the measurement result is higher.

[0019] Preferably, there are multiple magnetic flux measuring devices.

[0020] The beneficial effect of adopting the above further solution is that corresponding magnetic flux measuring devices can be set according to the number of magnetic steels included in the magnetic component group, so as to realize the one-time measurement of the magnetic fluxes of all magnetic steels and maximize the measurement efficiency.

[0021] Preferably, the fluxmeters in the multiple magnetic flux measuring devices are connected in series in sequence, and a reset key is also provided. A reset switch is provided on the fluxmeter, and the reset key is electrically connected to the reset switches of the multiple fluxmeters.

[0022] The beneficial effect of adopting the above further solution is that all fluxmeters can be reset with one key, and the efficiency is higher.

[0023] The present invention also discloses a method for measuring the magnetic flux of a single magnetic steel in a magnetic component group:

[0024] ① Prepare a magnetic conductor and a fluxmeter adapted to the single magnetic steel in the magnetic component group to be measured. The fluxmeter includes a measuring coil;

[0025] ② Place the magnetic conductor close to the single magnetic steel in the magnetic component group to be measured, and introduce the magnetic flux of the single magnetic steel in the magnetic component group to be measured into the magnetic conductor;

[0026] ③ Pass the magnetic conductor through the measuring coil of the fluxmeter;

[0027] ④ Use the fluxmeter to read the magnetic flux and obtain the magnetic flux corresponding to the single magnetic steel in the magnetic component group to be measured.

[0028] Advantages of the present invention: It is not necessary to disassemble the magnetic component, which can effectively export the magnetic flux of the single magnetic steel in the magnetic group and quickly measure the magnetic flux of the single magnetic steel. If there is a deviation in the magnetic flux value of the single magnetic steel, it can be quickly identified. At the same time, for the numerical values required for the setting range of the magnetic flux meter, when exceeding the upper and lower limit values of the specification, real-time alarm reminder can be achieved.

[0029] Further, in step ②, a tooling is used to limit the positions of the magnetic group to be measured and the magnetic conductor.

[0030] The advantage of adopting the above further scheme is to ensure the alignment of the positions of the single magnetic steel and the magnetic conductor in the magnetic group to be measured.

[0031] Further, this method is based on the device for measuring the magnetic flux of the single magnetic steel in the magnetic group.

[0032] The advantage of adopting the above further scheme is that the magnetic flux of each single magnetic steel in the entire magnetic group can be measured at one time, and the operation is convenient and fast. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the device for measuring the magnetic flux of the single magnetic steel in the magnetic group of the present invention;

[0034] Figure 2 It is a sectional structural diagram of the other components of the present invention except the magnetic flux meter;

[0035] Figure 3 It is a stress schematic diagram when the positions of the single magnetic steel and the magnetic conductor do not correspond;

[0036] Figure 4 It is a schematic diagram of the magnetic force line escape state without a positioning magnetic conductor;

[0037] Figure 5 It is a schematic diagram of the magnetic force line escape situation with a positioning magnetic conductor.

[0038] In the drawings, the list of the component names represented by each reference numeral is as follows:

[0039] 1. Base; 2. Limiting device; 3. Measuring device; 3-1. Positioning magnetic conductor; 3-2. Measuring coil; 3-3. Magnetic flux meter; 3-4. Reset button; 4. Magnetic group to be measured; 4-1. Single magnetic steel; 4-2. Non-magnetic assembly part; 5. Magnetic force line. Specific Embodiments

[0040] The principles and features of the present invention will be described below with reference to the drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0041] Please refer to Figure 1As shown in the figure, it is a schematic structural diagram of a device for measuring the magnetic flux of a single permanent magnet in a magnetic assembly according to the present invention, including a base 1, a limiting device 2, and a magnetic flux measuring device 3;

[0042] The limiting device 2 is cylindrical and fixed on the base 1 for restricting the position of the magnetic assembly 4 to be measured. The magnetic assembly 4 to be measured includes a plurality of single permanent magnets 4-1 and a non-magnetic assembly part 4-2;

[0043] The magnetic flux measuring device 3 includes a positioning magnetic conductor 3-1, a measuring coil 3-2, and a magnetic flux meter 3-3;

[0044] The positioning magnetic conductor 3-1 is fixed on the limiting device 2. When the magnetic assembly 4 to be measured is assembled in place, the position of the positioning magnetic conductor 3-1 corresponds to the position of the single permanent magnet 4-1 in the magnetic assembly 4 to be measured;

[0045] The measuring coil 3-2 is wound around the positioning magnetic conductor 3-1 for sensing the magnetic flux;

[0046] The measuring coil 3-2 is electrically connected to the magnetic flux meter 3-3 for displaying the magnetic flux sensed by the measuring coil.

[0047] The cross-sectional area of the positioning magnetic conductor 3-1 is greater than or equal to the cross-sectional area of the single permanent magnet 4-1.

[0048] A reset key 3-4 is provided in the magnetic flux measuring device. A reset switch is provided on the magnetic flux meter 3-3. The reset key 3-4 is electrically connected to the reset switch, and the reset key triggers the reset switch to act.

[0049] During use, after resetting with the reset key 3-4, the magnetic assembly component 4 is placed into the limiting device 2 to the bottom. The positioning magnetic conductor 3-1 attracts the single permanent magnet 4-1. If their centers do not coincide, as Figure 3 shown, there will be a lateral suction force F, making the centers of the single permanent magnet 4-1 and the positioning magnetic conductor 3-1 coincide. As Figure 5 shown, the positioning magnetic conductor 3-1 guides most of the magnetic force lines 5 of each single permanent magnet 4-1 into the corresponding measuring coil 3-2, thereby obtaining the magnetic flux value of each single permanent magnet 4-1 and displaying the value in the corresponding magnetic flux meter 3-3, improving the measurement accuracy. When the value exceeds the specification, an alarm is given. If there is no positioning magnetic conductor 3-1, more magnetic force lines 5 will surely bypass the measuring coil 3-2, resulting in inaccurate measurement results.

[0050] In the above embodiment, the method for measuring the magnetic flux of a single permanent magnet in a magnetic assembly disclosed by the present invention is incorporated at the same time.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for measuring the magnetic flux of a single permanent magnet in a magnetic assembly, characterized in that, It includes a base, a limiting device and a magnetic flux measuring device; The limiting device is cylindrical and fixed on the base, and is used to limit the position of the magnetic assembly to be measured during measurement; The magnetic flux measuring device includes a positioning magnetic conductor, a measuring coil and a magnetic flux meter; The positioning magnetic conductor is fixed on the limiting device. When the magnetic assembly to be measured is assembled in place, the position of the positioning magnetic conductor corresponds to the position of the single magnetic steel in the magnetic assembly to be measured; The measuring coil is wound around the positioning magnetic conductor and is used to sense the magnetic flux; The measuring coil is electrically connected to the magnetic flux meter and is used to display the magnetic flux sensed by the measuring coil.

2. The device for measuring the magnetic flux of a single permanent magnet in a magnetic group according to claim 1, characterized in that, The cross-sectional area of the positioning magnetic conductor is greater than or equal to the cross-sectional area of the single magnetic steel in the magnetic assembly to be measured.

3. The device for measuring the magnetic flux of a single permanent magnet in a magnetic group according to claim 1 or 2, characterized in that, There are multiple magnetic flux measuring devices.

4. The device for measuring the magnetic flux of a single permanent magnet in a magnetic assembly according to claim 3, characterized in that, A reset key is provided in the magnetic flux measuring device, a reset switch is provided on the magnetic flux meter, the reset key is electrically connected to the reset switch, and the reset key triggers the reset switch to act.

5. A method for measuring the magnetic flux of a single permanent magnet in a magnetic group, characterized in that, Adopting the device for measuring the magnetic flux of the single magnetic steel in the magnetic assembly as described in any one of claims 1-4, it includes the following steps: S1. Prepare a magnetic conductor and a magnetic flux meter adapted to the single magnetic steel in the magnetic assembly to be measured, and the magnetic flux meter includes a measuring coil; S2. Bring the magnetic conductor close to the single magnetic steel in the magnetic assembly to be measured, and introduce the magnetic flux of the single magnetic steel in the magnetic assembly to be measured into the magnetic conductor; S3. Insert the magnetic conductor into the measuring coil of the magnetic flux meter; S4. Use the magnetic flux meter to read the magnetic flux and obtain the magnetic flux corresponding to the single magnetic steel in the magnetic assembly to be measured.

6. The method for measuring the magnetic flux of a single permanent magnet in a magnetic assembly according to claim 5, characterized in that In step S2, a tooling is used to limit the positions of the magnetic assembly to be measured and the magnetic conductor.

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