Rotation structure of single-phase motor

Abstract

The invention provides a rotating structure of a single-phase motor, which comprises a rotor assembly, a main Hall element, an auxiliary Hall element and a control assembly, and is characterized in that the rotor assembly comprises a central axis, a magnetic ring and a permanent magnet, the magnetic ring rotates around the central axis in a forward rotation direction or a reverse rotation direction, the magnetic ring is arranged at the outer side of the permanent magnet, and the magnetic ring comprises a plurality of magnetic strips connected in sequence; the permanent magnet comprises a plurality of magnetic end parts corresponding to the plurality of magnetic strips; the main Hall element is arranged at the magnetic end part and is located at the leading position of the permanent magnet, and a jitter point is arranged between the magnetic end part corresponding to the main Hall element and one magnetic end part adjacent to the main Hall element along the forward rotation direction; the auxiliary Hall element is arranged at the magnetic end part corresponding to the main Hall element and is positioned on one side, facing the reverse direction, of the main Hall element, and the included angle between the auxiliary Hall element and the main Hall element is greater than the included angle between the jitter point and the advance position; the control assembly is in signal connection with the main Hall element and the auxiliary Hall element and is used for comparing the polarities of the magnetic strips detected by the main Hall element and the auxiliary Hall element.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a rotation structure of a single-phase motor. Background Art

[0002] When a single-phase DC brushless motor is working, the higher its speed, the greater the back electromotive force and the more the current lags behind the voltage output, resulting in the current waveform being warped backward, thus deteriorating the efficiency of the single-phase DC brushless motor and increasing the vibration and noise. At present, in order to avoid the backward warping of the current waveform, most single-phase DC brushless motors place the Hall element in the leading position to sense the pole change of the rotor assembly in advance. However, this setting method will cause the single-phase DC brushless motor to have a dead angle jitter phenomenon during startup, making the control device of the single-phase DC brushless motor mistakenly think that the single-phase DC brushless motor is working normally, and will continuously increase the power, resulting in overload and damage of internal components. Summary of the Invention

[0003] This application provides a rotation structure of a single-phase motor to solve the problem that the components of a single-phase DC brushless motor are damaged due to dead angle jitter in the known technology.

[0004] This application provides a rotation structure of a single-phase motor, including a rotor assembly, a main Hall element, a sub-Hall element, and a control assembly. The rotor assembly includes a central axis, a magnetic ring, and a permanent magnet. The magnetic ring can rotate around the central axis in the forward rotation direction or the reverse rotation direction. The magnetic ring is arranged outside the permanent magnet and includes a plurality of magnetic strips. The plurality of magnetic strips are sequentially connected end to end around the central axis, and the magnetic poles of any two adjacent magnetic strips are opposite. The permanent magnet includes a plurality of magnetic ends, the plurality of magnetic ends are arranged around the central axis, and the plurality of magnetic ends are correspondingly arranged with the plurality of magnetic strips. The main Hall element is arranged at the magnetic end and is located at the leading position of the permanent magnet. The leading position is set as the position where the main Hall element can sense the polarity change of the magnetic ring in advance when the magnetic ring rotates in the forward rotation direction. There is a jitter point between the magnetic end corresponding to the main Hall element and the adjacent magnetic end along the forward rotation direction. The sub-Hall element is arranged at the magnetic end corresponding to the main Hall element and is located on the side of the main Hall element facing the reverse rotation direction. The included angle between the sub-Hall element and the main Hall element is greater than the included angle between the jitter point and the leading position. The control assembly is respectively signal-connected to the main Hall element and the sub-Hall element for comparing the polarities of the magnetic strips detected by the main Hall element and the sub-Hall element.

[0005] In a possible implementation, the control component collects a first signal and a second signal. The first signal is set as the polarity signal of the magnetic strip detected by the main Hall element when the magnetic strip adjacent to the magnetic ring passes by the main Hall element and undergoes pole reversal. The second signal is set as the polarity signal of the magnetic strip detected by the sub-Hall element when the magnetic strip adjacent to the magnetic ring passes by the sub-Hall element and undergoes pole reversal. The control component compares the first signal and the second signal to determine the rotation direction of the rotor assembly.

[0006] In a possible implementation, the control component compares the first signal and the second signal. If the first signal is the same as the second signal, the rotor assembly rotates in the forward rotation direction. If the first signal is different from the second signal, the rotor assembly rotates in the reverse rotation direction.

[0007] In a possible implementation, the permanent magnet also has a center line, which is set as the angular bisector of the central angle of the arc between two adjacent magnetic ends. The leading position is located on the magnetic end adjacent to the center line and on the side of the center line facing the reverse direction.

[0008] In a possible implementation, the control component also collects a third signal and a fourth signal. The rotor assembly also includes a jitter dead zone, which is set as the included angle between the center line and the leading position. The third signal is set as the polarity of the magnetic strip detected by the main Hall element when the rotating structure of the single-phase motor starts within the jitter dead zone. The fourth signal is set as the polarity of the magnetic strip detected by the sub-Hall element when the rotating structure of the single-phase motor starts within the jitter dead zone. The control component compares the third signal and the fourth signal to determine the working state of the rotating structure of the single-phase motor.

[0009] In a possible implementation, the control component compares the third signal and the fourth signal. If the polarity of the magnetic strip detected by the third signal alternates, and the polarity of the magnetic strip detected by the fourth signal remains unchanged, the rotating structure of the single-phase motor undergoes abnormal jitter;

[0010] If the polarity of the magnetic strip detected by the third signal alternates, and the polarity of the magnetic strip detected by the fourth signal exchanges, the rotating structure of the single-phase motor works normally.

[0011] In a possible implementation, the magnetic end portion includes a first end portion and a second end portion. The second end portion is connected to one side of the first end portion facing the reverse direction. The thickness of the first end portion is greater than that of the first end portion, so that the distance between the first end portion and the magnetic ring is less than the distance between the second end portion and the magnetic ring. The main Hall sensor is disposed on the first end portion.

[0012] In a possible implementation, the permanent magnet further includes a plurality of connecting portions. The plurality of connecting portions are arranged at equal intervals around the central axis and are arranged in one-to-one correspondence with the plurality of magnetic end portions. One ends of the plurality of connecting portions close to the central axis are connected to each other, and the ends of the connecting portions far from the central axis are connected to the magnetic end portions.

[0013] In a possible implementation, the rotating structure of the single-phase motor further includes a circuit board and a plurality of coils. The plurality of coils are arranged corresponding to the plurality of connecting portions. The coils are wound around the outer periphery of the connecting portions. The coils are used to generate polarities of the magnetic end portions after being energized.

[0014] In a possible implementation, the polarities of two adjacent magnetic end portions are opposite. When the polarity of the magnetic end portion is the same as that of the magnetic strip on the side of the magnetic end portion far from the central axis, the rotor assembly rotates in the forward rotation direction. When the polarity of the magnetic end portion is opposite to that of the magnetic strip on the side of the magnetic end portion far from the central axis, the rotor assembly rotates in the reverse rotation direction.

[0015] In the rotating structure of the single-phase motor of the present application, by disposing the main Hall element at the leading position of the permanent magnet, when the magnetic ring rotates in the forward rotation direction, the main Hall element can sense the polarity change of the magnetic ring in advance, and the sub-Hall element is disposed on the magnetic end portion corresponding to the main Hall element and on the side of the main Hall element facing the reverse direction. At the same time, the included angle between the sub-Hall element and the main Hall element is greater than the included angle between the jitter point and the leading position, so as to distinguish the polarity changes of the magnetic strips detected by the sub-Hall element and the main Hall element, thereby comparing the polarities of the magnetic strips detected by the main Hall element and the sub-Hall element to timely determine whether there is a dead angle jitter phenomenon in the rotating structure of the single-phase motor, and timely take measures to protect the rotating structure of the single-phase motor to avoid damage caused by overloading of components due to continuous increase of current. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the rotating structure of the single-phase motor of the present application in an embodiment, in which the magnetic ring rotates in the reverse direction in the figure.

[0017] Figure 2 is Figure 1 the signal transmission schematic diagram of the rotating structure of the single-phase motor in an embodiment in

[0018] Figure 3 This is a schematic structural diagram of the rotation structure of the single-phase motor of the present application in an embodiment. In the figure, the magnetic ring rotates in the forward rotation direction.

[0019] Figure 4 This is a schematic structural diagram of the rotation structure of the single-phase motor of the present application in an embodiment without a secondary Hall element. In the figure, the magnetic ring rotates in the reverse rotation direction.

[0020] Figure 5 This is a schematic structural diagram of the rotation structure of the single-phase motor of the present application in an embodiment without a secondary Hall element. In the figure, the magnetic ring rotates in the forward rotation direction.

[0021] Figure 6 is Figure 1 a schematic structural diagram of another state of the rotation structure of the single-phase motor in an embodiment in

[0022] Figure 7 is Figure 6 a waveform diagram of the detection signals of the main Hall element and the secondary Hall element when the rotation structure of the single-phase motor in an embodiment is abnormally jittering.

[0023] Figure 8 is Figure 6 a waveform diagram of the detection signals of the main Hall element and the secondary Hall element when the rotation structure of the single-phase motor in an embodiment is rotating normally.

[0024] Description of main element symbols:

[0025] Rotation structure 100 of the single-phase motor

[0026] Reverse rotation direction 1

[0027] Forward rotation direction 2

[0028] Rotor assembly 3

[0029] Magnetic ring 10

[0030] Magnetic strip 11

[0031] Permanent magnet 20

[0032] Main body part 21

[0033] Connecting part 22

[0034] Magnetic end part 23

[0035] First end part 231

[0036] Second end part 232

[0037] Main Hall element 30

[0038] Auxiliary Hall element 40

[0039] Control component 50

[0040] Coil 60

[0041] Central axis Z

[0042] Arc edge L1

[0043] Straight edge L2

[0044] Center line L3

[0045] Leading position W

[0046] Jitter dead angle R

[0047] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0048] The following description will refer to the drawings to more fully describe the content of the present application. The exemplary embodiments shown in the drawings are of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that the present application is thorough and complete and will fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0049] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. Further, when used herein, "comprising" and / or "including" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups.

[0050] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Further, unless clearly defined herein, terms such as those defined in a general dictionary should be construed to have a meaning consistent with their meaning in the relevant art and the content of this application and will not be construed as idealized or overly formal meanings.

[0051] The following will refer to the drawings to further describe in detail the specific embodiments of the present application.

[0052] As Figures 1 to 3As shown, this embodiment provides a rotation structure 100 of a single-phase motor, which includes a rotor assembly 3, a main Hall element 30, a sub-Hall element 40, and a control assembly 50.

[0053] The rotor assembly 3 has a central axis Z and includes a magnetic ring 10 and a permanent magnet 20. The magnetic ring 10 is circular, and its center point coincides with the central axis Z. The magnetic ring 10 can rotate around the central axis Z in the forward rotation direction 2 or the reverse rotation direction 1. The magnetic ring 10 is provided outside the permanent magnet 20 and is within the magnetic field of the permanent magnet 20. The magnetic ring 10 includes a plurality of magnetic strips 11, and the plurality of magnetic strips 11 are connected end to end in sequence around the central axis Z, and the magnetic poles of any two adjacent magnetic strips 11 are opposite. The permanent magnet 20 includes a plurality of magnetic ends 23, and the plurality of magnetic ends 23 are arranged around the central axis Z, and the plurality of magnetic ends 23 are arranged in one-to-one correspondence with the plurality of magnetic strips 11.

[0054] The main Hall element 30 is provided on the magnetic end 23 and is located at the leading position W of the permanent magnet 20. The leading position W is set as the position where the main Hall element 30 can sense the polarity change of the magnetic ring 10 in advance when the magnetic ring 10 rotates in the forward rotation direction 2. There is a jitter point between the magnetic end 23 corresponding to the main Hall element 30 and the adjacent magnetic end 23 along the forward rotation direction 2. The sub-Hall element 40 is provided on the magnetic end 23 corresponding to the main Hall element 30 and is located on the side of the main Hall element 30 facing the reverse rotation direction 1. The included angle between the sub-Hall element 40 and the main Hall element 30 is greater than the included angle between the jitter point and the leading position W. The control assembly 50 is respectively connected to the main Hall element 30 and the sub-Hall element 40 in a signal connection manner, and is used for comparing the polarities of the magnetic strips 11 detected by the main Hall element 30 and the sub-Hall element 40.

[0055] It should be noted that the above main Hall element 30 and sub-Hall element 40 are provided on the magnetic end 23, which only illustrates the positions of the main Hall element 30 and the sub-Hall element 40 relative to the magnetic end 23. They are not necessarily fixed on the magnetic end 23, and they can also be fixed on other components outside the magnetic end 23, as long as their positions relative to the magnetic end 23 are as described above.

[0056] Thus, for the rotation structure 100 of the single-phase motor of the present application, by arranging the main Hall element 30 at the leading position W of the permanent magnet 20, when the magnetic ring 10 rotates in the forward rotation direction 2, the main Hall element 30 can sense the polarity change of the magnetic ring 10 in advance, and the secondary Hall element 40 is arranged at the magnetic end 23 corresponding to the main Hall element 30 and is located on the side of the main Hall element 30 facing the reverse rotation direction 1. At the same time, the included angle between the secondary Hall element 40 and the main Hall element 30 is greater than the included angle between the jitter point and the leading position W to distinguish the polarity changes of the magnetic strip 11 detected by the secondary Hall element 40 and the main Hall element 30, so as to compare the polarities of the magnetic strip 11 detected by the main Hall element 30 and the secondary Hall element 40 to timely determine whether there is a dead angle jitter phenomenon in the rotation structure 100 of the single-phase motor, and take measures in time to protect the rotation structure 100 of the single-phase motor to avoid damage caused by continuous increase of current leading to component overload.

[0057] Please also combine with Figures 1 to 3 , in an embodiment, the permanent magnet 20 is made of a magnetic material such as silicon steel sheet. The permanent magnet 20 includes a main body portion 21 and four connecting portions 22. The main body portion 21 is rectangular, the four connecting portions 22 are strip-shaped, and one end of each of the four connecting portions 22 is connected to the outer periphery of the main body portion 21. The four connecting portions 22 are arranged at equal intervals around the central axis Z, and the included angle between any two adjacent connecting portions 22 is 90°.

[0058] The four magnetic ends 23 are arranged in one-to-one correspondence with the four connecting portions 22, and the four magnetic ends 23 are respectively connected to the ends of the four connecting portions 22 far from the main body portion 21. The main body portion 21, the four connecting portions 22, and the four magnetic ends 23 are integrally formed.

[0059] The magnetic end 23 is fan-shaped and has an arc edge L1 and a straight edge L2. The two ends of the arc edge L1 are respectively connected to the two ends of the straight edge L2 to enclose the magnetic end 23. The angle of the central angle corresponding to the arc edge L1 is less than 90°, so that there is a gap between two adjacent magnetic ends 23, and the jitter point is located in the gap.

[0060] The magnetic ring 10 is spaced around the outer periphery of the permanent magnet 20, and the number of magnetic strips 11 is set to four. The four magnetic strips 11 are arranged in one-to-one correspondence with the four magnetic ends 23. The magnetic strip 11 is arc-shaped and its central angle is 90°. The central angle of the magnetic strip 11 is greater than the central angle corresponding to the magnetic end 23, so that the magnetic strip 11 can completely cover the magnetic end 23.

[0061] It can be understood that when other implementation manners are adopted, the number of the connecting portions 22, the magnetic ends 23, and the magnetic strips 11 can also be six or eight, etc., and the specific number can be selected according to actual design requirements.

[0062] Please further combine with Figures 1 to 3 In an embodiment, the rotating structure 100 of the single-phase motor further includes a plurality of coils 60. The plurality of coils 60 are correspondingly arranged with the plurality of connecting portions 22. The coils 60 are wound around the outer periphery of the connecting portions 22. The coils 60 are used to generate polarities on the magnetic end portions 23 after being energized.

[0063] Furthermore, the polarities of any two adjacent magnetic end portions 23 are opposite, and the polarities of any two adjacent magnetic strips 11 are opposite. When the polarity of the magnetic end portion 23 is the same as that of the magnetic strip 11 located on the side of the magnetic end portion 23 away from the central axis Z, the rotor assembly 3 rotates in the forward rotation direction 2. When the polarity of the magnetic end portion 23 is opposite to that of the magnetic strip 11 located on the side of the magnetic end portion 23 away from the central axis Z, the rotor assembly 3 rotates in the reverse rotation direction 1.

[0064] In this way, when the polarities of the corresponding magnetic end portion 23 and the magnetic strip 11 are the same, the magnetic strip 11 and the magnetic end portion 23 will generate a repulsive force, causing the magnetic ring 10 to rotate in the reverse rotation direction 1. When the polarities of the corresponding magnetic end portion 23 and the magnetic strip 11 are opposite, the magnetic strip 11 and the magnetic end portion 23 will generate an attractive force, causing the magnetic ring 10 to rotate in the forward rotation direction 2.

[0065] Please further combine with Figures 1 to 3 In an embodiment, along the extending direction of the arc edge L1, the magnetic end portion 23 includes a first end portion 231 and a second end portion 232. The second end portion 232 is connected to the side of the first end portion 231 facing the reverse rotation direction 1. The thickness of the first end portion 231 is greater than that of the first end portion 231, and the distance of the magnetic end portion 23 from the central axis Z decreases in sequence from the first end portion 231 to the second end portion 232. The distance between the first end portion 231 and the magnetic ring 10 is less than the distance between the second end portion 232 and the magnetic ring 10, so that the magnetic force between the first end portion 231 and the magnetic ring 10 is greater than the magnetic force between the second end portion 232 and the magnetic ring 10. When the polarities of the corresponding magnetic end portion 23 and the magnetic strip 11 are the same, the magnetic ring 10 is more likely to rotate in the reverse rotation direction 1. The main Hall sensor is arranged on the first end portion 231. In the initial state, when the polarities of the corresponding magnetic end portion 23 and the magnetic strip 11 are the same, the magnetic ring 10 will rotate in the reverse rotation direction 1, resulting in a change in the magnetic strip 11 corresponding to the main Hall sensor, enabling the main Hall sensor to collect the polarity of another magnetic strip 11 more quickly.

[0066] Please further combine with Figures 1 to 3, in one embodiment, the control component 50 collects a first signal and a second signal. The first signal is set to be the polarity signal of the magnetic strip 11 detected by the main Hall element 30 when the adjacent magnetic strips 11 in the magnetic ring 10 pass by the main Hall element 30 and change poles. The second signal is set to be the polarity signal of the magnetic strip 11 detected by the sub-Hall element 40 when the adjacent magnetic strips 11 in the magnetic ring 10 pass by the sub-Hall element 40 and change poles. The control component 50 compares the first signal and the second signal to determine the rotation direction of the rotor assembly 3.

[0067] The control component 50 compares the first signal and the second signal. If the first signal is the same as the second signal, the rotor assembly 3 rotates along the forward rotation direction 2. If the first signal is different from the second signal, the rotor assembly 3 rotates along the reverse rotation direction 1.

[0068] Specifically, as Figure 1 shown, and combined with Figure 2 , the uppermost magnetic end 23 in the figure is the S pole, and the uppermost magnetic strip 11 is the N pole. The main Hall element 30 detects that the corresponding magnetic strip 11 is the N pole. When the magnetic ring 10 is affected by an anomaly, such as system return air, causing the magnetic ring 10 to rotate a certain angle along the reverse rotation direction 1, and this angle is less than the included angle between the sub-Hall element 40 and the main Hall element 30, the main Hall element 30 will detect that the corresponding magnetic strip 11 changes to the S pole and outputs a first signal to the control component 50. And the sub-Hall element 40 is located in front of the main Hall element 30 along the reverse rotation direction 1, so that the magnetic strip 11 sensed by the sub-Hall element 40 is still the N pole and outputs a second signal to the control component 50. The polarities of the first signal and the second signal are opposite. At this time, the rotor assembly 3 rotates along the reverse rotation direction 1.

[0069] Correspondingly, from the above description, it can be known that when the uppermost magnetic end 23 in the figure is the N pole and the uppermost magnetic strip 11 is the S pole, the main Hall element 30 detects that the corresponding magnetic strip 11 is the S pole. When the magnetic ring 10 is affected by an anomaly, such as system return air, causing the magnetic ring 10 to rotate a certain angle along the reverse rotation direction 1, and this angle is less than the included angle between the sub-Hall element 40 and the main Hall element 30, the main Hall element 30 will detect that the corresponding magnetic strip 11 changes to the N pole and outputs a first signal to the control component 50. And the sub-Hall element 40 is located in front of the main Hall element 30 along the reverse rotation direction 1, so that the magnetic strip 11 sensed by the sub-Hall element 40 is still the S pole and outputs a second signal to the control component 50. The polarities of the first signal and the second signal are opposite. At this time, the rotor assembly 3 rotates along the reverse rotation direction 1.

[0070] Specifically, as Figure 3 shown, and combined with Figure 2, the magnetic end 23 at the uppermost part in the figure is the N pole, and the uppermost magnetic strip 11 is the N pole. The main Hall element 30 detects that the corresponding magnetic strip 11 is the N pole. When the magnetic ring 10 rotates a certain angle along the forward rotation direction 2, and this angle is small so that the magnetic strip 11 corresponding to the secondary Hall element 40 and the main Hall element 30 does not change, then the main Hall element 30 will detect that the corresponding magnetic strip 11 is still the N pole and output a first signal to the control component 50. The magnetic strip 11 sensed by the secondary Hall element 40 is still the N pole and outputs a second signal to the control component 50. The polarities of the first signal and the second signal are the same. At this time, the rotor assembly 3 rotates along the forward rotation direction 2.

[0071] Correspondingly, from the above description, when the magnetic end 23 at the uppermost part in the figure is the S pole, and the uppermost magnetic strip 11 is the S pole, the main Hall element 30 detects that the corresponding magnetic strip 11 is the S pole. When the magnetic ring 10 rotates a certain angle along the forward rotation direction 2, and this angle is small so that the magnetic strip 11 corresponding to the secondary Hall element 40 and the main Hall element 30 does not change, then the main Hall element 30 will detect that the corresponding magnetic strip 11 is still the S pole and output a first signal to the control component 50. The magnetic strip 11 sensed by the secondary Hall element 40 is still the S pole and outputs a second signal to the control component 50. The polarities of the first signal and the second signal are the same. At this time, the rotor assembly 3 rotates along the forward rotation direction 2.

[0072] Please also combine with Figures 1 to 3 , in an embodiment, the permanent magnet 20 further has a center line L3, and the center line L3 is set as the angular bisector of the central angle of the arc between two adjacent magnetic ends 23. The leading position W is arranged on the magnetic end 23 adjacent to the center line L3 and is located on the side of the center line L3 facing the reverse rotation direction 1. The rotor assembly 3 further includes a jitter dead zone R, and the jitter dead zone R is set as the included angle between the center line L3 and the leading position W, and the jitter point coincides with the center line L3.

[0073] In particular, in order to better illustrate the relationship between the setting of the leading position W and the start dead zone jitter of the rotation structure 100 of the single-phase motor, take Figure 4 and Figure 5 as examples for illustration.

[0074] When the rotation structure 100 of the single-phase motor is in a stationary state or the first magnetization state, the uppermost magnetic strip 11 is the N pole, and the main Hall element 30 detects that the corresponding magnetic strip 11 is the N pole. The main Hall element 30 feeds back a signal to the control component 50, and the control component 50 adjusts the current flow direction of the coil 60 so that the uppermost magnetic end 23 is also the N pole. At this time, the magnetic ring 10 rotates a certain angle along the reverse rotation direction 1, and the rotation angle is less than the jitter dead zone R, that is, it rotates to Figure 4The state shown. The main Hall element 30 detects that the corresponding magnetic stripe 11 is still the N pole, and since the magnetic polarity of the magnetic end 23 is the same as that of the magnetic stripe 11, the magnetic ring 10 will continue to rotate in the reverse direction 1.

[0075] However, when the magnetic ring 10 continues to rotate until its rotation angle is greater than the jitter dead zone R, the main Hall element 30 detects that the corresponding magnetic stripe 11 is the S pole. The main Hall element 30 feeds back a signal to the control component 50, and the control component 50 adjusts the current flow direction of the coil 60 to adjust the uppermost magnetic end 23 to the N pole, which is the Figure 5 state shown. At this time, since most of the magnetic end 23 of the uppermost S pole corresponds to the magnetic stripe 11 of the N pole and a small part corresponds to the magnetic stripe 11 of the S pole, the magnetic attraction force between the magnetic ring 10 and the permanent magnet 20 is greater than the magnetic repulsion force. Then the magnetic ring 10 will rotate in the forward direction 2. When the magnetic ring 10 rotates in the forward direction 2 by a certain angle, the main Hall element 30 detects that the corresponding magnetic stripe 11 becomes the N pole again. The main Hall element 30 feeds back a signal to the control component 50, and the control component 50 adjusts the current flow direction of the coil 60 to adjust the uppermost magnetic end 23 to the N pole. That is, the rotation structure 100 of the single-phase motor is in the above-mentioned static state or the first magnetization state again, and the above actions are repeated. As a result, the rotation structure 100 of the single-phase motor shows a jitter phenomenon. This jitter phenomenon will cause the control component 50 to think that a normal steering switch is being performed, resulting in a continuous increase in current and causing the component to be overloaded and damaged.

[0076] In one embodiment, the control component 50 also collects a third signal and a fourth signal. The third signal is set as the polarity change signal of the magnetic stripe 11 detected by the main Hall element 30 when the rotation structure 100 of the single-phase motor starts within the jitter dead zone R. The fourth signal is set as the polarity change signal of the magnetic stripe 11 detected by the secondary Hall element 40 when the rotation structure 100 of the single-phase motor starts within the jitter dead zone R. The control component 50 compares the third signal and the fourth signal to judge the working state of the rotation structure 100 of the single-phase motor.

[0077] Furthermore, the control component 50 compares the third signal and the fourth signal. If the polarity of the magnetic stripe 11 detected by the third signal alternates, and the polarity of the magnetic stripe 11 detected by the fourth signal remains unchanged, then the rotation structure 100 of the single-phase motor has an abnormal jitter, and the control component 50 adjusts the coil current to avoid the situation of component overload.

[0078] If the polarity of the magnetic stripe 11 detected by the third signal alternates, and the polarity of the magnetic stripe 11 detected by the fourth signal exchanges, then the control component 50 controls the rotation structure 100 of the single-phase motor to work normally.

[0079] Specifically as Figure 6 shown, and referring to the aboveFigure 4 and Figure 5 , and regarding the description of the operating state in Figure 4 and Figure 4 . It can be seen that when the rotating structure 100 of the single-phase motor is in the stationary state or the first magnetization state, the uppermost magnetic strip 11 is an N pole. The main Hall element 30 detects that the corresponding magnetic strip 11 is an N pole, and the secondary Hall element 40 also detects that the corresponding magnetic strip 11 is an N pole. When the rotating structure 100 of the single-phase motor undergoes abnormal jitter as described above, the magnetic ring 10 rotates back and forth within the range of the jitter dead zone R, resulting in the polarity of the magnetic strip 11 detected by the main Hall element 30 changing from N pole to S pole, then from S pole to N pole, and continuously repeating the above changes. And the rotation angle of the magnetic ring 10 is within the jitter dead zone R, causing the secondary Hall element 40 to always detect the same magnetic strip 11, that is, when the rotating structure 100 of the single-phase motor is in the stationary state or the first magnetization state, the uppermost magnetic strip 11 of the N pole, so as to continuously collect the signals monitored by the main Hall element 30 and the secondary Hall element 40 and obtain the signal schematic diagram as Figure 7 shown. Figure 7 In

[0080] , specifically as Figure 6 shown, and referring to the above Figure 4 and Figure 5 , and regarding the description of the operating state in Figure 4 and Figure 5 . It can be seen that when the rotating structure 100 of the single-phase motor is in the stationary state or the first magnetization state, the uppermost magnetic strip 11 is an N pole. The main Hall element 30 detects that the corresponding magnetic strip 11 is an N pole, and the secondary Hall element 40 also detects that the corresponding magnetic strip 11 is an N pole. When the rotating structure 100 of the single-phase motor rotates normally in the reverse direction 1, that is, the rotation angle in the reverse direction 1 is greater than the jitter dead zone R, the uppermost N-pole magnetic strip 11 becomes the adjacent S-pole magnetic strip 11. Both the main Hall element 30 and the secondary Hall element 40 detect that the magnetism of the magnetic strip 11 becomes S pole. At the same time, since in the reverse direction 1, the secondary Hall element 40 is in front of the main Hall element 30, the main Hall element 30 will detect that the magnetism of the magnetic strip 11 changes from N pole to S pole earlier than the secondary Hall element 40. In addition, when the magnetic ring 10 continues to rotate in the reverse direction 1, the uppermost S-pole magnetic strip 11 becomes the adjacent N-pole magnetic strip 11. Both the main Hall element 30 and the secondary Hall element 40 detect that the magnetism of the magnetic strip 11 becomes N pole, so as to continuously collect the signals monitored by the main Hall element 30 and the secondary Hall element 40 and obtain the signal schematic diagram as Figure 8 shown. Figure 8 In

[0081] The control component 50 can determine whether the rotation structure 100 of the single-phase motor is in abnormal jitter or normal working condition according to the signal schematic diagram of the change in the polarity of the magnetic stripe 11, so as to take measures in time to protect the rotation structure 100 of the single-phase motor.

[0082] In the above text, the specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A rotating structure of a single-phase motor, comprising a rotor assembly. The rotor assembly includes a central axis, a magnetic ring, and a permanent magnet. The magnetic ring can rotate around the central axis in the forward rotation direction or the reverse rotation direction. The magnetic ring is disposed outside the permanent magnet and includes a plurality of magnetic strips. The plurality of magnetic strips are sequentially connected end to end around the central axis, and the magnetic poles of any two adjacent magnetic strips are opposite to each other. Characterized in that, The permanent magnet includes a plurality of magnetic ends. The plurality of magnetic ends are arranged around the central axis, and the plurality of magnetic ends are arranged corresponding to the plurality of magnetic strips. The rotating structure of the single-phase motor further includes: A main Hall element. The main Hall element is disposed on the magnetic end and is located at the leading position of the permanent magnet. The leading position is set as the position where the main Hall element can sense the polarity change of the magnetic ring in advance when the magnetic ring rotates in the forward rotation direction. There is a jitter point between the magnetic end corresponding to the main Hall element and the adjacent magnetic end along the forward rotation direction. A sub-Hall element. The sub-Hall element is disposed on the magnetic end corresponding to the main Hall element and is located on the side of the main Hall element facing the reverse rotation direction. The included angle between the sub-Hall element and the main Hall element is greater than the included angle between the jitter point and the leading position. A control component. The control component is respectively signal-connected to the main Hall element and the sub-Hall element, and is used for comparing the polarities of the magnetic strips detected by the main Hall element and the sub-Hall element.

2. The rotating structure of the single-phase motor according to claim 1, Characterized in that, The control component collects a first signal and a second signal. The first signal is set as the polarity signal of the magnetic strip detected by the main Hall element when the adjacent magnetic strips in the magnetic ring pass through the main Hall element and change poles. The second signal is set as the polarity signal of the magnetic strip detected by the sub-Hall element when the adjacent magnetic strips in the magnetic ring pass through the sub-Hall element and change poles. The control component compares the first signal and the second signal to judge the rotation direction of the rotor assembly.

3. The rotating structure of the single-phase motor according to claim 2, Characterized in that, The control component compares the first signal and the second signal. If the first signal is the same as the second signal, the rotor assembly rotates in the forward rotation direction. If the first signal is different from the second signal, the rotor assembly rotates in the reverse rotation direction.

4. The rotating structure of the single-phase motor according to claim 1, Characterized in that, The permanent magnet also has a center line. The center line is set as the angular bisector of the central angle of the arc between two adjacent magnetic ends. The leading position is disposed on the magnetic end adjacent to the center line and is located on the side of the center line facing the reverse rotation direction. The jitter point coincides with the center line.

5. The rotating structure of the single-phase motor according to claim 4, Characterized in that, The control component also collects a third signal and a fourth signal. The rotor assembly has a jitter dead zone, which is set as the angle between the center line and the leading position. The third signal is set as the polarity of the magnetic strip detected by the main Hall element when the rotating structure of the single-phase motor starts within the jitter dead zone. The fourth signal is set as the polarity of the magnetic strip detected by the secondary Hall element when the rotating structure of the single-phase motor starts within the jitter dead zone. The control component compares the third signal and the fourth signal to determine the working state of the rotating structure of the single-phase motor.

6. The rotating structure of the single-phase motor according to claim 5, wherein, the control component compares the third signal and the fourth signal. If the polarity of the magnetic strip detected by the third signal alternates, and the polarity of the magnetic strip detected by the fourth signal remains unchanged, then the rotating structure of the single-phase motor has abnormal jitter; If the polarity of the magnetic strip detected by the third signal alternates, and the polarity of the magnetic strip detected by the fourth signal exchanges, then the rotating structure of the single-phase motor operates normally.

7. The rotating structure of the single-phase motor according to claim 1, wherein, the magnetic end portion includes a first end portion and a second end portion. The second end portion is connected to one side of the first end portion facing the reverse direction. The thickness of the first end portion is greater than the thickness of the first end portion, so that the distance between the first end portion and the magnetic ring is less than the distance between the second end portion and the magnetic ring. The main Hall sensor is disposed on the first end portion.

8. The rotating structure of the single-phase motor according to claim 1, wherein, the permanent magnet further includes a plurality of connecting portions. The plurality of connecting portions are arranged at equal intervals around the central axis and are correspondingly arranged with the plurality of magnetic end portions. One ends of the plurality of connecting portions close to the central axis are connected to each other, and the ends of the connecting portions far from the central axis are connected to the magnetic end portions.

9. The rotating structure of the single-phase motor according to claim 8, wherein, the rotating structure of the single-phase motor further includes a plurality of coils. The plurality of coils are correspondingly arranged with the plurality of connecting portions. The coils are wound around the outer periphery of the connecting portions, and the coils are used to generate polarity of the magnetic end portion after being energized.

10. The rotating structure of the single-phase motor according to claim 9, wherein, the polarities of two adjacent magnetic end portions are opposite. When the polarity of the magnetic end portion is the same as that of the magnetic strip located on the side of the magnetic end portion far from the central axis, the rotor assembly rotates in the forward rotation direction. When the polarity of the magnetic end portion is opposite to that of the magnetic strip located on the side of the magnetic end portion far from the central axis, the rotor assembly rotates in the reverse rotation direction.

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