A brushless motor that does not require Hall sensors

Abstract

This utility model relates to a brushless motor, and more particularly to a brushless motor that does not require a Hall sensor. It includes a rotor and a stator. The rotor includes a permanent magnet, and the stator includes an electromagnetic assembly. The electromagnetic assembly cooperates with the permanent magnet. The permanent magnet is arranged circumferentially along the rotor's rotation center line, and the electromagnetic assembly is arranged radially along the rotor's rotation center line. The electromagnetic assembly includes electromagnet A and electromagnet B, with at least two of each. Electromagnets A and B are staggered circumferentially along the rotor's rotation center line. Electromagnets A and B have the same magnetic pole facing the rotor. Electromagnets A and B are alternately energized, forming a traction segment between them. As long as the permanent magnet is between the start and end points of the traction segment, it will experience a traction force. When the permanent magnet is at the start or end point of the traction segment, it will remain stationary and will not reverse.

Description

Technical Field

[0001] This utility model relates to a brushless motor, and more particularly to a brushless motor that does not require a Hall sensor. Background Technology

[0002] Existing brushless motors generate a rotating magnetic field by energizing the stator windings in a specific sequence through a controller, which attracts the rotor permanent magnet to rotate accordingly. Hall sensors need to be installed on the stator to detect the position of the rotor magnetic poles and output signals to the controller to ensure the synchronous rotation of the stator magnetic field and the rotor magnetic field. This method is costly and complex to control. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a brushless motor that does not require a Hall sensor, wherein two sets of electromagnets are alternately energized to pull a permanent magnet.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: This brushless motor without Hall sensors includes a rotor and a stator. The rotor includes a permanent magnet, and the stator includes an electromagnetic assembly. The electromagnetic assembly cooperates with the permanent magnet. The permanent magnet is arranged circumferentially along the rotor's rotation center line, and the electromagnetic assembly is arranged radially along the rotor's rotation center line. The electromagnetic assembly includes electromagnet A and electromagnet B, and there are at least two electromagnets A and B. Electromagnets A and B are staggered and distributed circumferentially along the rotor's rotation center line. The magnetic poles of electromagnets A and B facing the rotor are the same, and electromagnets A and B are alternately energized.

[0005] In this scheme, energized electromagnets form a traction segment. Permanent magnets are arranged circumferentially along the rotor's rotation centerline. Electromagnets A and B have the same magnetic pole facing the rotor, assumed to be the S pole. The N pole of the permanent magnet will be attracted, and the S pole will be repelled, causing the permanent magnet to drive the rotor to rotate as a whole. When the permanent magnet reaches the end of the traction segment, it will stop at the energized electromagnet. At this time, the energized electromagnet is changed to create a new traction segment. As long as the permanent magnet is between the end and the beginning of the traction segment, it will be subject to traction force and drive the rotor to rotate in the same direction. When the permanent magnet is at the beginning or end of the traction segment, it will only stop and will not reverse.

[0006] Preferably, at least two of the permanent magnets are circumferentially spaced along the rotor rotation center line, and the magnetic poles of adjacent permanent magnets are opposite on adjacent sides.

[0007] In this scheme, the addition of permanent magnets can increase the traction force on the rotor and increase the rotation speed. The magnetic poles of adjacent permanent magnets are opposite, so that the traction force on each permanent magnet in the traction section drives the rotor to rotate in the same direction.

[0008] Preferably, the stator has a space for the rotor to be inserted and rotated.

[0009] In this design, permanent magnets are placed in the inner ring of the electromagnetic components, and the spacing between the permanent magnets is small.

[0010] Preferably, the number of electromagnets A and electromagnets B are equal and they are distributed at equal intervals.

[0011] In this scheme, the traction force on the permanent magnet is consistent in each energizing cycle, and the rotational speed is stable.

[0012] Preferably, the number of the permanent magnet, electromagnet A, and electromagnet B are all four.

[0013] In this design, the brushless motor has a compact structure and sufficient traction.

[0014] Preferably, it also includes an AC circuit, which has a forward branch and a reverse branch. In the forward branch, electromagnet A is connected in series with a forward diode, and in the reverse branch, electromagnet B is connected in series with a reverse diode.

[0015] In this scheme, an AC power source is used to alternately energize electromagnet A and electromagnet B, making the control simple.

[0016] The beneficial effect of this invention is that a traction segment is formed between the energized electromagnets. As long as the permanent magnet is between the start and end points of the traction segment, it will be subjected to a traction force. When the permanent magnet is at the start or end point of the traction segment, it will only remain stationary and will not reverse. Therefore, this invention has substantial features and progress compared with the prior art. Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Rotor; 2. Permanent magnet; 3. Electromagnetic assembly; 4. Electromagnet A; 5. Electromagnet B. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0023] See appendix Figure 1 In this embodiment, a brushless motor without a Hall sensor is provided, including a rotor 1 and a stator. The rotor 1 includes a permanent magnet 2, and the stator includes an electromagnetic component 3. The electromagnetic component 3 cooperates with the permanent magnet 2, and the stator has a space for the rotor 1 to be inserted and rotated.

[0024] The permanent magnets 2 are arranged circumferentially along the rotation center line of the rotor 1. The permanent magnets 2 are distributed at intervals along the rotation center line of the rotor 1. The magnetic poles of adjacent permanent magnets 2 are opposite. The electromagnetic assembly 3 is arranged radially along the rotation center line of the rotor 1. The electromagnetic assembly 3 includes electromagnets A4 and B5. The number of electromagnets A4 and B5 is equal and they are distributed at equal intervals. The electromagnets A4 and B5 are distributed alternately along the rotation center line of the rotor 1. The magnetic poles of electromagnets A4 and B5 facing the rotor 1 are the same. There are four permanent magnets 2, four electromagnets A4, and four electromagnets B5. The assembly also includes an AC circuit. The AC circuit forms a forward branch and a reverse branch. In the forward branch, electromagnet A4 is connected in series with a forward diode. In the reverse branch, electromagnet B5 is connected in series with a reverse diode.

[0025] In this embodiment, electromagnets A4 and B5 are alternately energized, forming a traction segment between adjacent energized electromagnets. Assuming the magnetic poles of electromagnets A4 and B5 facing rotor 1 are S poles, the N pole of permanent magnet 2 will be attracted, and the S pole will be repelled. As long as permanent magnet 2 is between the end and beginning of the traction segment, it will experience a traction force. When permanent magnet 2 is at the beginning or end of the traction segment, the attraction and repulsion forces are balanced, and permanent magnet 2 will remain stationary and will not rotate backward. After the energized electromagnets change, permanent magnet 2 will be between the end and beginning of the new traction segment and continue to be tractioned. The frequency of the alternating current can be modulated using a frequency converter to control the rotation. The speed is improved by increasing the number of diodes to form a bridge rectifier circuit; the current direction of the electromagnet remains unchanged, greatly reducing heat generation and stabilizing the operating temperature of the brushless motor; the alternating energization means that when electromagnet A4 is energized, electromagnet B5 is de-energized, and when electromagnet A4 is de-energized, electromagnet B5 is energized; electromagnets A4 and B5 are connected in series; in this embodiment, the staggered distribution is such that there is one electromagnet B5 between adjacent electromagnets A4 and one electromagnet A4 between adjacent electromagnets B5; forward current can pass through the forward diode but cannot pass through the reverse diode, and reverse current can pass through the reverse diode but cannot pass through the forward diode, which is a mature technology.

[0026] The above description represents the preferred embodiment of this utility model. It should be noted that the scope of protection of this utility model is not limited thereto. For those skilled in the art, various improvements, modifications, or equivalent substitutions can be made without departing from the equivalent inventive concept disclosed in this utility model, and these can also be considered as part of the scope of protection of this utility model.

Claims

1. A brushless motor that does not require a Hall sensor, comprising: Rotor (1), which includes permanent magnet (2); The stator includes an electromagnetic component (3) that cooperates with the permanent magnet (2); characterized in that The permanent magnet (2) is arranged circumferentially along the rotation center line of the rotor (1), and the electromagnetic component (3) is arranged radially along the rotation center line of the rotor (1). The electromagnetic component (3) includes electromagnet A (4) and electromagnet B (5). There are at least two electromagnets A (4) and B (5). Electromagnets A (4) and B (5) are staggered and distributed circumferentially along the rotation center line of the rotor (1). The magnetic poles of electromagnets A (4) and B (5) facing the rotor (1) are the same. Electromagnets A (4) and B (5) are alternately energized.

2. A brushless motor without a Hall sensor as described in claim 1, characterized in that: At least two of the permanent magnets (2) are circumferentially spaced along the rotation center line of the rotor (1), and the magnetic poles on adjacent sides of the adjacent permanent magnets (2) are opposite.

3. A brushless motor without a Hall sensor as described in claim 2, characterized in that: The stator has a space for the rotor (1) to be inserted and rotated.

4. A brushless motor without a Hall sensor as described in claim 1, characterized in that: The number of electromagnets A (4) and B (5) are equal and they are distributed at equal intervals.

5. A brushless motor without a Hall sensor as described in claim 4, characterized in that: The number of permanent magnets (2), electromagnets A (4) and B (5) are all four.

6. A brushless motor without a Hall sensor as described in claim 1, characterized in that: It also includes an AC circuit, in which a forward branch and a reverse branch are formed. In the forward branch, electromagnet A (4) is connected in series with a forward diode, and in the reverse branch, electromagnet B (5) is connected in series with a reverse diode.

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