Hall mounting structure for preventing axial movement of rotor in permanent magnet motor

Abstract

The utility model discloses a Hall mounting structure for preventing axial movement of a rotor in a permanent magnet motor. The Hall mounting structure comprises a stator and the rotor, a coil winding is designed on the stator, and a magnetic steel group is fixedly mounted on the rotor; one magnetic steel sheet in the magnetic steel group extends out of the end part of the rotor, a mounting frame is fixedly connected to the stator, a plurality of Hall sensors are arranged on the mounting frame, and the side surfaces, extending out of the end surface of the rotor, of the magnetic steel sheets correspond to the Hall sensors; and the mounting rack is correspondingly positioned outside the end part of the stator after being fixed with the stator. On the premise that the Hall sensor keeps away from a strong electromagnetic area of a coil winding on the stator and a high-temperature area generated during working, the magnetic steel sheet extends out of the side face of the end face of the rotor to form magnetic field induction with the Hall sensor correspondingly, the magnetic surface of the extending part of the embedded rotor is read, and even if the motor rotor axially moves, the magnetic surface of the magnetic steel sheet can be read. And the sensing gap distance between the Hall sensor and the side surface of the magnetic steel sheet is not changed, so that the position sensing accuracy of the Hall sensor is ensured.

Description

Technical Field

[0001] This invention belongs to the field of Hall effect sensor technology for permanent magnet motors, and specifically relates to a Hall effect sensor structure for preventing rotor axial movement in a permanent magnet motor. Background Technology

[0002] Existing motors use Hall effect sensors to detect the rotor position in real time. The detected rotor position signal is fed back to the controller to realize the commutation of the motor and generate a rotating magnetic field of synchronous rotor in the stator.

[0003] In traditional embedded magnet motors, Hall sensors are installed on the inner wall of the stator winding core end, forming a radial electric beam magnetic field induction on the circumferential surface with the magnets on the rotor. This ensures the position angle of the Hall sensor and is also low in cost. However, the Hall sensor always operates in a high temperature and high electromagnetic environment. Working in the strong electromagnetic environment of the motor's high current overload operation, the Hall sensor cannot read the polarity of the rotor magnets and therefore cannot work under strong electromagnetic interference.

[0004] Therefore, an improved structure was developed to address the defects of the aforementioned structure. This improved structure places the Hall sensor outside the stator and simultaneously forms a magnetic field with the side of the magnet at the rotor end, thereby reading the surface magnetic poles reflected from the embedded magnet to the rotor core. However, this method requires a certain gap distance between the Hall sensor and the rotor end, as well as the side of the magnet at the rotor end. During motor operation, there is axial movement of the rotor, which causes the gap distance between the rotor end, the side of the magnet at the rotor end, and the Hall sensor to change. This results in the Hall sensor's position sensing being inaccurate, making improvement necessary. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to provide a Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a Hall mounting structure for preventing rotor axial movement in a permanent magnet motor, comprising a stator and a rotor, wherein the stator is designed with coil windings and a magnet assembly is fixedly mounted on the rotor; one of the magnets in the magnet assembly extends out of the end of the rotor, and a mounting bracket is fixedly connected to the stator, wherein multiple Hall sensors are arranged on the mounting bracket, and the side of the magnet extending out of the rotor end face corresponds to the Hall sensor; after the mounting bracket is fixed to the stator, it is positioned outside the stator end, thereby allowing the Hall sensor on the mounting bracket to avoid the strong electromagnetic region of the coil windings on the stator and the high temperature region generated during operation, while the side of the magnet extending out of the rotor end face corresponds to the Hall sensor to form a magnetic field induction.

[0007] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the mounting bracket is provided with multiple fixed ends, and the stator is provided with fixed grooves corresponding to the fixed ends. The mounting bracket is fixedly installed with the stator through the cooperation of the fixed ends and the fixed grooves, and the Hall sensor is fixedly installed along with the mounting bracket.

[0008] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the fixed end is located on the bottom side of the mounting bracket, and the fixed groove is located at the stator end corresponding to the coil winding gap, thereby making the mounting bracket and the coil winding on the stator staggered and facilitating the installation and connection of the mounting bracket and the stator.

[0009] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the side of the mounting bracket is provided with multiple reinforcing bosses.

[0010] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the reinforcing boss is positioned corresponding to the fixed end, so that the reinforcing boss is positioned in the gap of the coil winding after the mounting bracket is fixed to the stator.

[0011] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, a temperature sensor is installed on the mounting bracket, and the temperature sensor is located next to the Hall sensor.

[0012] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the Hall sensor is a bipolar Hall sensor, and the Hall sensor is fixed on the mounting bracket.

[0013] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, a fixed boss is provided on the mounting bracket, and a mounting groove is provided on the fixed boss, in which the Hall sensor is fixed.

[0014] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the Hall sensor is a surface-mount Hall sensor, and the mounting bracket is designed as a circuit board, meaning that the mounting bracket contains circuitry for connecting the Hall sensor and the temperature sensor.

[0015] In the Hall mounting structure for preventing rotor axial movement in a permanent magnet motor as described above, the Hall sensor is fixed to the mounting bracket by surface welding, and the Hall sensor is connected to the circuit in the mounting bracket.

[0016] The present invention has the following beneficial effects:

[0017] This invention relocates the Hall sensor from its original location in a strong electromagnetic environment by designing a mounting bracket. The Hall sensor is now located outside the stator. This design ensures that the Hall sensor on the mounting bracket avoids the strong electromagnetic region of the stator coil windings and the high-temperature region generated during operation. Simultaneously, the side of the magnet extending from the rotor end face forms a magnetic field with the Hall sensor to sense and read the magnetic poles of the embedded rotor core. In this way, even if there is axial movement of the motor rotor, the sensing gap between the Hall sensor and the side of the magnet will not change, thus ensuring the accuracy of the Hall sensor's position sensing.

[0018] Meanwhile, the mounting bracket of this invention only requires a few positioning points to fix it to the stator, and the position is offset from the coil winding. In particular, the installation position of Hall sensors on existing flat wire hairpin winding stators is limited, so Hall sensors can be installed very conveniently. Moreover, the effect is better than that of encoders and the cost is lower. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0021] Figure 3 This is a planar cross-sectional view of the present invention;

[0022] Figure 4 , Figure 5 These are perspective views of the mounting bracket from different angles in this invention. Detailed Implementation

[0023] The invention will be further described with reference to the accompanying drawings. Example

[0024] Please see Figures 1 to 5 This invention provides a Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor, including a stator 1 and a rotor 2. The stator 1 is designed with coil windings 3, and a magnet assembly 4 is fixedly mounted on the rotor 2. One of the magnet pieces 4-1 in the magnet assembly 4 extends out of the end of the rotor 2. A mounting bracket 5 is fixedly connected to the stator 1, and multiple Hall sensors 6 are arranged on the mounting bracket 5. The side of the magnet piece 4-1 extending out of the rotor end face corresponds to the Hall sensor 6. After the mounting bracket 5 is fixed to the stator 1, it is positioned outside the end of the stator 1, so that the Hall sensor 6 on the mounting bracket 5 avoids the strong electromagnetic area of ​​the coil windings 3 on the stator and the high temperature area generated during operation. At the same time, the side of the magnet piece 4-1 extending out of the rotor end face corresponds to the Hall sensor 6 to form a magnetic field induction.

[0025] Specifically, the mounting bracket 5 is provided with multiple fixed ends 5-1, and the stator 1 is provided with a fixing groove 7 corresponding to the fixed ends 5-1. The mounting bracket 5 is fixedly installed with the stator 1 through the cooperation of the fixed ends 5-1 and the fixing groove 7, and the Hall sensor 6 is fixedly installed along with the mounting bracket 5.

[0026] Furthermore, the fixed end 5-1 is located on the bottom side of the mounting bracket 5, and the fixed groove 7 is located at the end of the stator 1 corresponding to the gap of the coil winding 3, so that the mounting bracket 5 and the coil winding 3 on the stator 1 are staggered, which facilitates the installation and connection of the mounting bracket 5 and the stator 1.

[0027] Furthermore, in order to improve the firmness of the fixed connection between the mounting bracket 5 and the stator 1, a plurality of reinforcing protrusions 8 are provided on the side of the mounting bracket 5; the reinforcing protrusions 8 are positioned corresponding to the fixed end 5-1, so that the reinforcing protrusions 8 are positioned in the gap of the coil winding 3 after the mounting bracket 5 and the stator 1 are fixed.

[0028] Furthermore, a temperature sensor (not shown in the figure) is provided on the mounting bracket 5. The temperature sensor is located next to the Hall sensor and can monitor and provide feedback on the operating environment temperature of the Hall sensor 6 in real time, so as to know whether it is affected.

[0029] In this embodiment, the Hall sensor 6 is a bipolar Hall sensor. The Hall sensor 6 is fixed on the mounting bracket 5. Specifically, the mounting bracket 5 is provided with a fixing boss 9, and the fixing boss 9 is provided with a mounting groove 10. The Hall sensor 6 is fixed in the mounting groove 10. Example

[0030] This invention provides a Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor. Unlike Embodiment 1, the Hall sensor 6 in this embodiment is a surface-mount Hall sensor, and the mounting bracket 5 is designed as a circuit board. That is, the mounting bracket 5 has a circuit for connecting the Hall sensor and the temperature sensor. The Hall sensor 6 is fixed to the mounting bracket 5 by surface mounting, and the Hall sensor 6 is connected to the circuit in the mounting bracket 5. In Embodiment 2, apart from the corresponding circuit design on the mounting bracket 5, the other structures connected to the stator are the same as in Embodiment 1, so they will not be described in detail with drawings.

[0031] The Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor, provided by the embodiments of the present invention, has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solution disclosed in the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor, comprising a stator (1) and a rotor (2), wherein the stator (1) is designed with coil windings (3) and a magnet assembly (4) is fixedly mounted on the rotor (2); characterized in that: One of the magnets (4-1) in the magnet group (4) extends out of the end of the rotor (2). A mounting bracket (5) is fixedly connected to the stator (1). Multiple Hall sensors (6) are provided on the mounting bracket (5). The side of the magnet (4-1) extending out of the rotor end face corresponds to the Hall sensor (6). After the mounting bracket (5) is fixed to the stator (1), it is located outside the end of the stator (1), so that the Hall sensor (6) on the mounting bracket (5) avoids the strong electromagnetic area of ​​the coil winding (3) on the stator and the high temperature area generated during operation. At the same time, the side of the magnet (4-1) extending out of the rotor (2) end face corresponds to the Hall sensor (6) to form a magnetic field induction.

2. The Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 1, characterized in that: The mounting bracket (5) is provided with multiple fixed ends (5-1), and the stator (1) is provided with a fixed groove (7) corresponding to the fixed end (5-1). The mounting bracket (5) is fixedly installed with the stator (1) through the cooperation of the fixed end (5-1) and the fixed groove (7). The Hall sensor (6) is fixedly installed with the mounting bracket (5).

3. The Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 2, characterized in that: The fixed end (5-1) is located on the bottom side of the mounting bracket (5), and the fixed groove (7) is located at the end of the stator (1) corresponding to the gap of the coil winding (3), so that the mounting bracket (5) and the coil winding (3) on the stator (1) are staggered, which facilitates the installation and connection of the mounting bracket (5) and the stator (1).

4. The Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 3, characterized in that: The mounting bracket (5) has multiple reinforcing bosses (8) on its side.

5. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 4, characterized in that: The reinforcing boss (8) is positioned corresponding to the fixed end (5-1), so that the reinforcing boss (8) is positioned in the gap of the coil winding (3) after the mounting bracket (5) and the stator (1) are fixed.

6. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 2, characterized in that: A temperature sensor is provided on the mounting bracket (5), and the temperature sensor is located next to the Hall sensor.

7. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to any one of claims 1 to 6, characterized in that: The Hall sensor (6) is a bipolar Hall sensor, and the Hall sensor (6) is fixed on the mounting bracket (5).

8. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 7, characterized in that: The mounting bracket (5) is provided with a fixed boss (9), and the fixed boss (9) is provided with a mounting groove (10), in which the Hall sensor (6) is fixed.

9. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to any one of claims 1 to 6, characterized in that: The Hall sensor (6) is a surface-mount Hall sensor, and the mounting bracket (5) is designed as a circuit board, that is, the mounting bracket (5) is equipped with a circuit for connecting the Hall sensor and the temperature sensor.

10. A Hall effect mounting structure for preventing rotor axial movement in a permanent magnet motor according to claim 9, characterized in that: The Hall sensor (6) is fixed to the mounting bracket (5) by soldering, and the Hall sensor (6) is connected to the circuit in the mounting bracket (5).

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