A tangential permanent magnet motor overall magnetizing device

Abstract

The application belongs to the technical field of permanent magnet motor overall magnetization, and discloses a tangential permanent magnet motor overall magnetization device, wherein the magnetization yoke assembly comprises a first magnetic field regulating yoke, a magnetic conductive medium and a second magnetic field regulating yoke, the conductivity of the regulating yoke is higher than that of the magnetic conductive medium, the magnetic conductive medium and the second magnetic field regulating yoke are alternately arranged into an annular outer yoke ring, an inner coil passes through the first magnetic field regulating yoke, an outer coil passes through the magnetic conductive medium, the two coils are in the same coil plane, and the area between the first magnetic field regulating yoke and the outer yoke ring is used for mounting a rotor iron core; a fixing structure is used for fixing the magnetization yoke assembly and mounting the rotor iron core, and the magnetizing magnetic steel to be magnetized in the rotor iron core is distributed around the area between the first magnetic field regulating yoke and the outer yoke ring and the shaft center of the rotor iron core is located in the coil plane. The above magnetization device can improve magnetization saturation, reduce magnetic field vector superposition cancellation and reduce demagnetization effect on adjacent magnetic poles, thereby improving magnetization effect.

Description

Technical Field

[0001] This invention belongs to the technical field of overall magnetization of permanent magnet motors, and more specifically, relates to an overall magnetization device for tangential permanent magnet motors. Background Technology

[0002] The overall magnetization technology first installs unmagnetized magnets onto the motor to form magnetic poles, and then applies a magnetic field through a magnetization coil to magnetize the motor or magnetic poles. Since the magnetic force of strong permanent magnets does not need to be considered during installation, the reinforcement structure is simplified, the risk of damage to permanent magnets is reduced, and personal safety is ensured. A single discharge can magnetize one or more magnetic poles, greatly improving overall efficiency and making it suitable for assembly line production operations.

[0003] Currently, there are two main methods for magnetizing a motor as a whole: whole-machine magnetization and pole-by-pole magnetization. Whole-machine magnetization involves placing a magnetizing coil for each magnetic pole and discharging all the coils simultaneously to magnetize all the magnetic poles in one go. Pole-by-pole magnetization, on the other hand, involves placing a single coil and magnetizing one magnetic pole at a time, thus completing the magnetization of all the magnetic poles in multiple stages.

[0004] However, regardless of whether it's the existing whole-machine magnetization or single-pole magnetization, because the magnetic poles in the rotor core extend towards the shaft while the magnetizing coils are arranged on the outside of the rotor, the magnetic density of the poles is higher on the side closer to the magnetizing coils and lower on the side away from the magnetizing coils, leading to incomplete magnetization of the poles. Furthermore, in whole-machine magnetization, the magnetic field vectors generated by multiple magnetizing coils cancel each other out, potentially resulting in incomplete magnetization. In single-pole magnetization, magnetizing one pole can cause demagnetization of other nearby poles.

[0005] Therefore, there is an urgent need to provide a tangential permanent magnet motor overall magnetization device that can improve magnetization saturation, reduce magnetic field vector superposition and cancellation, and reduce the demagnetization effect on adjacent magnetic poles. Summary of the Invention

[0006] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a tangential permanent magnet motor integral magnetization device, which aims to improve the magnetization saturation, reduce the superposition and cancellation of magnetic field vectors and reduce the demagnetization effect on adjacent magnetic poles, thereby improving the magnetization effect.

[0007] To achieve the above objectives, an integrated magnetization device for a tangential permanent magnet motor is proposed, comprising a coil assembly, a magnetization yoke assembly, and a fixing structure; The coil assembly includes a coil pair consisting of an inner coil and an outer coil; The magnetizing yoke assembly includes a first magnetic field regulating yoke, a magnetically conductive medium, and a second magnetic field regulating yoke. The conductivity of the first and second magnetic field regulating yokes is higher than that of the magnetically conductive medium. The magnetically conductive medium and the second magnetic field regulating yoke are alternately arranged in an outer ring. The first magnetic field regulating yoke is placed in the inner region of the outer ring. The inner coil passes through the first magnetic field regulating yoke, and the outer coil passes through the magnetically conductive medium. The portions of the inner and outer coils in the same coil pair that pass through their corresponding yokes are on the same coil plane. The area between the first magnetic field regulating yoke and the outer ring is used to install the rotor core to be magnetized. The fixing structure is used to fix the magnetizing yoke assembly and install the rotor core. The magnets to be magnetized in the rotor core after installation are distributed around the area between the first magnetic field control yoke and the outer yoke ring, and the axis of the rotor core is located in the coil plane. After being energized, the inner and outer coils of the coil pair tangentially magnetize the magnets to be magnetized between the two coils in the same direction, and a coil pair only magnetizes a set of magnets to be magnetized on its coil plane at the same time.

[0008] In summary, compared with the prior art, the technical solutions conceived in this invention have the following main advantages: In this invention's magnetization device, not only is an outer coil provided, but also an inner coil coplanar with the outer coil. When the steel to be magnetized rotates to the coil plane, both ends of the steel have magnetization coils. Compared to the traditional method of only providing a magnetization coil at one end of the steel, this invention uses both inner and outer coils, which can improve the magnetization saturation of the steel. Furthermore, the inner and outer coils are integrated together, and directional magnetic pole enhancement can be achieved through electromagnetic field vector superposition. In this invention's magnetization device, the magnetizing yoke provides a path for the magnetizing magnetic field and adjusts the magnetic field configuration. In this invention, the outer yoke ring is configured as an alternating magnetic conductive medium and a second magnetic field-controlled yoke. The conductivity of the first and second magnetic field-controlled yokes is higher than that of the magnetic conductive medium. During magnetization, the higher conductivity of the first and second magnetic field-controlled yokes can regulate the magnetic field distribution, concentrating the magnetic field lines near the coil and fully magnetizing the steel to be magnetized. This reduces the superposition and cancellation phenomenon between different magnetic fields and weakens the demagnetizing effect of the magnetic field lines on adjacent steel. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall magnetization device for a tangential permanent magnet motor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the magnet to be magnetized located on the coil plane during magnetization in one embodiment of the present invention; Figure 3This is a schematic diagram of a structure in one embodiment of the present invention in which the number of coil pairs is the same as the number of pairs of the magnet to be magnetized; Figure 4 This is a magnetic field diagram of an embodiment where the second magnetic field is not used to control the yoke; Figure 5 This is a magnetic field diagram of a magnetic yoke with a second magnetic field set in one embodiment of the present invention; Figure 6 This is a flowchart of the magnetization control steps in one embodiment of the present invention; In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Rotor core; 2. The first magnetic field controls the magnetic yoke; 3. The second magnetic field controls the magnetic yoke; 4. Magnetic medium; 5. Inner coil; 5(1)~5(4) are the inner coils in the first to fourth coil pairs; 6. Outer coil; 6(1)~6(4) are the outer coils in the first to fourth coil pairs; 7. Target magnet; 8. Adjacent magnets. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0011] like Figure 1 The diagram shown is a structural schematic of the integral magnetization device for a tangential permanent magnet motor according to an embodiment of the present invention. Figure 2 The diagram shown illustrates the magnet to be magnetized positioned on the coil plane during magnetization according to an embodiment of the present invention. The magnetization device includes a coil assembly, a magnetizing yoke assembly, and a fixing structure. The coil assembly includes a coil pair consisting of an inner coil 5 and an outer coil 6. The magnetizing yoke assembly includes a first magnetic field regulating yoke 2, a magnetically conductive medium 4, and a second magnetic field regulating yoke 3.

[0012] In this design, the magnetic medium 4 and the second magnetic field regulating yoke 3 are alternately arranged in an outer ring, with the first magnetic field regulating yoke 2 placed within the outer ring. The inner coil 5 passes through the first magnetic field regulating yoke 2, and the outer coil 6 passes through the magnetic medium 4. The portions of the inner coil 5 and outer coil 6 in the same coil pair that pass through their corresponding yokes are on the same coil plane. The position of the coils outside the yoke is not critical. The area between the first magnetic field regulating yoke 2 and the outer ring is used to install the rotor core 1 to be magnetized. A fixing structure (not shown in the figure) is used to fix the magnetizing yoke assembly and install the rotor core 1. After installation, the magnets to be magnetized in the rotor core 1 are distributed around the area between the first magnetic field regulating yoke 2 and the outer ring, and the axis of the rotor core 1 is located on the coil plane of the coil pair. Since the magnets to be magnetized in the rotor core 1 are axially symmetrical with respect to the axis of the rotor core 1, this invention ensures that the axis of the rotor core 1 is located on the coil plane of the coil pair, thus guaranteeing that any symmetrical set of magnets can be located on the coil plane when the rotor core is rotated. When energized, the inner coil 5 and outer coil 6 of the coil pair tangentially magnetize the magnet to be magnetized located between the two coils in the same direction, and a coil pair only magnetizes a set of magnets to be magnetized located on its coil plane at the same time.

[0013] In the magnetization device of the present invention, not only is an outer coil provided, but also an inner coil that is coplanar with the outer coil. When the steel to be magnetized is rotated to the plane of the coil, both ends of the steel have magnetization coils. Compared with the traditional method of only providing a magnetization coil at one end of the steel, the present invention provides both inner and outer coils, which can improve the magnetization saturation of the steel.

[0014] In the magnetization device of this invention, the magnetizing yoke provides a path for the magnetizing magnetic field and adjusts the magnetic field configuration. In this invention, a first magnetic field regulating yoke is set inside, and the outer yoke ring is set as an alternating magnetic conductive medium and a second magnetic field regulating yoke. The conductivity of the first magnetic field regulating yoke and the second magnetic field regulating yoke is higher than that of the magnetic conductive medium. During magnetization, the first magnetic field regulating yoke and the second magnetic field regulating yoke, which have higher conductivity, can change the magnetic field distribution of the outer coil, so that the magnetic field lines are concentrated near the coil and fully magnetize the steel to be magnetized. This can reduce the superposition and cancellation phenomenon between different magnetic fields and weaken the demagnetizing effect of the magnetic field lines on the adjacent magnets.

[0015] In one embodiment, when the magnet to be magnetized of the rotor core 1 rotates to the coil plane of the coil pair for magnetization, at least part of the magnetic yoke of the second magnetic field control yoke 3 is located in the angle region between the target magnet 7 and its adjacent magnet 8. The second magnetic field control yoke 3 is used to weaken the influence of the magnetization magnetic field on the adjacent magnet 8. The target magnet 7 is the magnet being magnetized.

[0016] In one embodiment, to simplify the manufacturing process, the coil assembly has only one coil pair, and the magnets are magnetized sequentially using this single coil pair. In other embodiments, the coil assembly may also have multiple coil pairs, allowing multiple sets of magnets to be magnetized simultaneously, thereby increasing the magnetization rate.

[0017] like Figure 3 The diagram shown is a structural schematic of an embodiment of the present invention in which the number of coil pairs is the same as the number of pairs of magnets to be magnetized. The coil assembly has n coil pairs, where n is the number of pairs of magnets to be magnetized in the rotor core. The n coil pairs correspond one-to-one with the n magnets to be magnetized, and each magnet to be magnetized is located on its corresponding coil plane. Figure 3 The example provides four magnets to be magnetized, and the coil assembly also has four pairs of coils, each pair of coils being responsible for magnetizing its corresponding magnet.

[0018] like Figure 4 Here is a magnetic field diagram of a yoke without a second magnetic field in one embodiment, such as... Figure 5 This is a magnetic field diagram showing the magnetic field lines of a yoke controlled by a second magnetic field in one embodiment of the present invention. From... Figure 4 It can be seen that without a second magnetic field to regulate the yoke, the magnetic field lines in the magnetically conductive medium diverge outwards, thus affecting the nearby magnets. Figure 5 As can be seen, setting a second magnetic field with higher conductivity to control the magnetic yoke can block the divergence of magnetic field lines, thereby reducing the influence of magnetic field lines on its adjacent magnets. When several coils simultaneously magnetize multiple sets of magnets, the second magnetic field controlling the magnetic yoke reduces the divergence of magnetic field lines and can also reduce the superposition of magnetic fields.

[0019] In one embodiment, the magnetic medium 4 can be a silicon steel yoke or epoxy resin. When the required magnetic field does not exceed the saturation magnetic field of the silicon steel sheet, a silicon steel yoke can be selected. When the required magnetic field is much higher than the saturation magnetic field of silicon steel, the silicon steel yoke will enter a deep saturation state, and the permeability will drop sharply (approaching vacuum permeability). Using silicon steel at this point will result in significant losses, and epoxy resin can be used for fixation only. The first magnetic field regulating yoke 2 and the second magnetic field regulating yoke 3 can be yokes with high conductivity, such as copper or aluminum yokes. Because the magnets are closer together on the inner coil side, the magnetic field lines of the first magnetic field regulating yoke do not diverge significantly, thus reducing the impact on other magnets. Only the end region of the magnets closer to the inner coil is magnetized by the magnetic field lines of the inner coil, while other regions of the magnets are mainly magnetized by the magnetic field lines of the outer coil. Therefore, the magnetic field lines in the magnetic medium diverge to a certain extent. Combined with the arrangement of the second magnetic field regulating yoke, this achieves both magnetization of the more distant parts of the magnets and reduces the impact on adjacent magnets, thus improving the overall magnetization effect. Furthermore, the magnetic medium is made of silicon steel or epoxy resin, and the first and second magnetic field control yokes are made of copper or aluminum. By combining the above, the magnetic field configuration is adjusted, and the yoke bears the stress generated by the coil during magnetization, ensuring that the position of the magnetization coil is fixed and the structure is stable.

[0020] In one embodiment, when the motor is installed, the first magnetic field control yoke 2 can be placed in the hollow area of ​​the rotor core 1 shaft, or it can be located in the heat dissipation hole of the rotor core 1, as long as it can ensure that the magnets to be charged on the rotor core 1 are surrounded by the first magnetic field control yoke 2 and located in the inner area of ​​the outer yoke ring.

[0021] In one embodiment, the magnetizing device further includes a pulse power supply for providing pulse current to the coil assembly. The inner and outer magnetizing coils in the same coil pair act together on the magnet to be magnetized, generating a pulsed magnetic field to magnetize it. The inner and outer magnetizing coils can be connected in series to the pulse power supply, or they can be connected to the pulse power supply independently.

[0022] To minimize the superposition and cancellation of magnetic field vectors, the coil assembly is designed to magnetize only a single pole pair or a portion of pole pairs simultaneously, with the pole pairs being magnetized at the same distance. This reduces or avoids the superposition and cancellation between different magnetic fields. During magnetization, the rotor core needs to be rotated after each magnetization cycle to magnetize the other magnets.

[0023] In one embodiment, the magnetization device further includes a magnetization control device, which automatically controls the regulation of magnetization.

[0024] Specifically, when the number of coil pairs is the same as the number of magnet pairs to be magnetized, i.e., different coil pairs are responsible for magnetizing different magnet pairs, the magnetization control device divides n magnets to be magnetized into p groups, and magnetizes each group of magnets in sequence. Each time magnetization occurs, a pulse current is applied to the coil pairs of that group of magnets to achieve magnetization, where 1 < p ≤ n. For example, when p = n, it means that each coil pair is turned on sequentially to achieve magnetization of each magnet to be magnetized sequentially. When p < n, it means that p / n coil pairs are turned on each time to magnetize p / n pairs of magnets to be magnetized, and the spacing between the p / n pairs of magnets to be magnetized is as large as possible. For example, if there are 4 magnets to be magnetized, they can be magnetized in 2 times. The first magnetization is turned on by connecting 5(1), 6(1), 5(3), and 6(3), and the second magnetization is turned on by connecting 5(2), 6(2), 5(4), and 6(4).

[0025] Specifically, when the number of coil pairs is less than the number of magnet pairs to be magnetized in the rotor core, it is necessary to control the rotor core to rotate. Specifically, the magnetization control device is used to control the rotor core to rotate after each magnet to be magnetized on the coil plane, so that the next magnet to be magnetized in the rotor core rotates to the coil plane of the coil pair and is magnetized, until all magnets to be magnetized in the rotor core are magnetized.

[0026] Specifically, such as Figure 6 The diagram shown is a flowchart of the magnetization control steps in one embodiment of the present invention, which includes: S1. After the rotor core is assembled into the magnetization device, the rotor core is adjusted to the initial magnetization position so that any magnet to be magnetized in the rotor core rotates to the coil plane of the coil pair of the magnetization device for magnetization. S2. After the magnets to be magnetized on the coil plane are magnetized, rotate the rotor core so that the other magnets to be magnetized can be rotated to the coil plane for magnetization. S3. Repeat S2 until all magnets on the rotor core have been magnetized, then end the magnetization process.

[0027] Specifically, the magnetization control equipment calculates the rotation angle based on the logarithm n of the magnets to be magnetized in the rotor core. After the magnets to be magnetized on the coil plane are magnetized, the rotor core is rotated, specifically by rotating the rotor core. The angle is adjusted so that the next set of adjacent magnets to be magnetized rotates onto the coil plane for magnetization.

[0028] In summary, compared to the traditional method of setting a magnetizing coil only at one end of the magnet, this invention uses inner and outer coils, which can improve the magnetization saturation of the magnet. Furthermore, the inner and outer coils are integrated together, and directional magnetic pole enhancement can be achieved through electromagnetic field vector superposition. Moreover, the outer yoke ring is configured with alternating magnetic conductive media and a second magnetic field-controlled yoke. The conductivity of the first and second magnetic field-controlled yokes is higher than that of the magnetic conductive media. During magnetization, the higher conductivity of the first and second magnetic field-controlled yokes can change the magnetic field distribution of the outer coil, causing the magnetic field lines to concentrate near the outer coil. This reduces the superposition and cancellation phenomenon between different magnetic fields and weakens the demagnetizing effect of the magnetic field lines on nearby magnets. Therefore, the magnetization device designed in this invention can improve the overall magnetization effect of the rotor core.

[0029] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It should be noted that the terms "in one embodiment," "for example," and "again" are intended to illustrate the present invention and are not intended to limit the present invention.

[0030] The embodiments described above are merely examples 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 patent application. 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 modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A tangential permanent magnet motor integral magnetization device, characterized in that, Includes coil assembly, magnetized yoke assembly, and fixing structure; The coil assembly includes a coil pair consisting of an inner coil and an outer coil; The magnetizing yoke assembly includes a first magnetic field regulating yoke, a magnetically conductive medium, and a second magnetic field regulating yoke. The conductivity of both the first and second magnetic field regulating yokes is higher than that of the magnetically conductive medium. The magnetically conductive medium and the second magnetic field regulating yoke are alternately arranged in an outer ring. The first magnetic field regulating yoke is placed in the inner region of the outer ring. The inner coil passes through the first magnetic field regulating yoke, and the outer coil passes through the magnetically conductive medium. The portions of the inner and outer coils in the same coil pair that pass through their corresponding yokes are on the same coil plane. The area between the first magnetic field regulating yoke and the outer ring is used to install the rotor core to be magnetized. The fixing structure is used to fix the magnetizing yoke assembly and install the rotor core. The magnets to be magnetized in the rotor core after installation are distributed around the area between the first magnetic field control yoke and the outer yoke ring, and the axis of the rotor core is located in the coil plane. After being energized, the inner and outer coils of the coil pair tangentially magnetize the magnets to be magnetized between the inner and outer coils in the same direction, and a coil pair only magnetizes a group of magnets to be magnetized on its coil plane at the same time.

2. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, When the magnet to be magnetized in the rotor core rotates to the coil plane of the coil pair for magnetization, at least part of the second magnetic field control yoke is located in the angle region between the target magnet and its adjacent magnets. The second magnetic field control yoke is used to weaken the influence of the magnetization magnetic field on the magnets adjacent to the target magnet, which is the magnet being magnetized.

3. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The magnetic medium is made of silicon steel or epoxy resin, and the first and second magnetic field control yokes are made of copper or aluminum.

4. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The inner coil, the outer coil, and the rotor core share a common central axis.

5. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The first magnetic field-controlled yoke is placed in the hollow area of ​​the rotor core shaft or in the heat dissipation holes.

6. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The magnetizing device also includes a pulse power supply for providing pulse current to the coil assembly.

7. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The coil assembly has n coil pairs, where n is the number of pairs of magnets to be magnetized in the rotor core. The n coil pairs correspond one-to-one with the n magnets to be magnetized, and each magnet to be magnetized is located on its corresponding coil plane. The magnetization device further includes a magnetization control device, which is used to divide n magnets to be magnetized into p groups, and to magnetize the p groups of magnets to be magnetized one by one in sequence. Each time magnetization is performed, a pulse current is applied to the coil of the group of magnets to be magnetized to achieve magnetization of the group of magnets to be magnetized, where 1 < p ≤ n.

8. The integral magnetization device for a tangential permanent magnet motor as described in claim 1, characterized in that, The number of coil pairs in the coil assembly is less than the number of magnet pairs to be magnetized in the rotor core; The magnetizing device also includes a magnetizing control device, which controls the rotor core to rotate after each magnetized magnet on the coil plane is completed, so that the next magnet to be magnetized in the rotor core rotates to the coil plane of the coil pair and is magnetized, until all magnets to be magnetized in the rotor core are completed.

9. The integral magnetization device for a tangential permanent magnet motor as described in claim 8, characterized in that, The magnetization control device is specifically used to perform: S1. After the rotor core is assembled into the magnetizing device, the rotor core is adjusted to the initial magnetizing position so that any magnet to be magnetized in the rotor core is rotated to the coil plane of the coil pair of the magnetizing device for magnetization. S2. After the magnets to be magnetized on the coil plane are magnetized, rotate the rotor core so that other magnets to be magnetized can be rotated to the coil plane for magnetization. S3. Repeat S2 until all the magnets to be magnetized on the rotor core are magnetized, and then end the magnetization process.

10. The integral magnetization device for a tangential permanent magnet motor as described in claim 9, characterized in that, The magnetization control device calculates the rotation angle based on the logarithm n of the magnets to be magnetized in the rotor core. After the magnets to be magnetized on the plane of the coil are magnetized, the rotor core is rotated, specifically by rotating the rotor core. The angle is adjusted so that the next set of adjacent magnets to be magnetized rotates onto the plane of the coil for magnetization.

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