Rotor for a rotating-field dc motor and rotating-field dc motor

Abstract

This utility model relates to a rotor of a rotating magnetic field DC motor and the rotating magnetic field DC motor itself. The rotor includes a rotor shaft with its axis extending in a front-to-back direction, and at least one pair of magnetic poles disposed around the rotor shaft. An iron sleeve is fitted onto the rotor shaft. The magnetic poles are made of arc-shaped magnetic steel petals, each magnetic steel petal being sequentially fixed to the outer circumference of the iron sleeve. The outer circumferential magnetic poles of adjacent magnetic steel petals are opposite, and adjacent sides of adjacent magnetic steel petals are in contact, forming a continuous circumferential surface structure on the outer circumference of each magnetic steel petal. This utility model solves the technical problem in the prior art where the rotor magnetic field cannot be utilized to the maximum extent due to rotor magnetic field leakage.

Description

Technical Field

[0001] This utility model relates to the field of DC motors, and in particular to a rotor and a rotating magnetic field DC motor. Background Technology

[0002] A rotating magnetic field DC motor is a new type of DC motor. Its structural principle is as disclosed in Chinese patent CN104092343A, "A Rotating Magnetic Field DC Motor". The DC motor includes a stator, a rotor and a control circuit. The rotor includes a rotor shaft and at least one pair of magnetically opposing magnets are provided on the rotor shaft. The stator is provided with multiple stator windings distributed along the circumference. The control circuit is connected to each stator winding and is used to control the direction of the DC current in the corresponding stator winding.

[0003] Its working principle is that the N pole and S pole of the magnet correspond to at least two stator windings respectively. In order to ensure the continuous magnetic field thrust on the rotor, the current direction of each stator winding corresponding to the N pole and the stator winding corresponding to the S pole are different. As the stator rotates, the current direction of the corresponding stator winding will also change. The stator winding realizes slot-by-slot commutation. Therefore, the stator magnetic field generated by the stator winding moves slot by slot. The rotor moves with the movement of the stator magnetic field. It is for this reason that this type of motor is called a rotating magnetic field DC motor.

[0004] The problem with existing DC motors is that there is a circumferential gap between the N and S poles, which means that there is magnetic leakage in the rotor magnetic field. The rotor magnetic field cannot be utilized to the maximum extent, which is not conducive to improving motor efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a rotor for a rotating magnetic field DC motor, which solves the technical problem in the prior art that the rotor magnetic field cannot be utilized to the maximum extent due to rotor magnetic field leakage; the purpose of this invention is also to provide a rotating magnetic field DC motor using this rotor.

[0006] The technical solution for the rotor of the rotating magnetic field DC motor in this utility model is as follows: The rotor of the rotating magnetic field DC motor includes a rotor shaft with its axis extending in the front-rear direction, and at least one pair of magnetic poles disposed around the rotor shaft. An iron sleeve is fitted on the rotor shaft. The magnetic poles are made of arc-shaped magnetic steel petals. Each magnetic steel petal is sequentially fixed to the outer periphery of the iron sleeve along the circumference. The outer periphery magnetic poles of adjacent magnetic steel petals are opposite. The adjacent sides of adjacent magnetic steel petals are in contact, so that the outer periphery of each magnetic steel petal forms a continuous circumferential surface structure.

[0007] Furthermore, the iron sleeve is a pure iron sleeve.

[0008] Furthermore, the iron sleeve is provided with threaded holes corresponding to the magnet petals, and the magnet petals are provided with screw holes corresponding to the threaded holes. Non-magnetic screws are inserted into the screw holes and threaded holes to fix the magnet petals to the outer periphery of the iron sleeve.

[0009] Furthermore, the front center angle of the magnet flap is the same as the rear center angle of the magnet flap.

[0010] Furthermore, the two adjacent magnets are the first magnet and the second magnet, respectively. The front center angle of the first magnet is greater than the rear center angle of the first magnet, and the front center angle of the second magnet is less than the rear center angle of the second magnet.

[0011] The technical solution for the rotating magnetic field DC motor in this utility model is as follows: A rotating magnetic field DC motor includes a stator and a rotor. The stator is provided with multiple stator windings distributed circumferentially. The rotor includes a rotor shaft whose axis extends in the front-rear direction. The rotor also includes at least one pair of magnetic poles disposed around the rotor shaft. An iron sleeve is sleeved on the rotor shaft. The magnetic poles are made of arc-shaped magnetic steel petals. Each magnetic steel petal is sequentially fixed to the outer periphery of the iron sleeve along the circumference. The outer periphery magnetic poles of adjacent magnetic steel petals are opposite. The adjacent sides of adjacent magnetic steel petals are in contact, so that the outer periphery of each magnetic steel petal forms a continuous circumferential surface structure.

[0012] Furthermore, the iron sleeve is a pure iron sleeve.

[0013] Furthermore, the iron sleeve is provided with threaded holes corresponding to the magnet petals, and the magnet petals are provided with screw holes corresponding to the threaded holes. Non-magnetic screws are inserted into the screw holes and threaded holes to fix the magnet petals to the outer periphery of the iron sleeve.

[0014] Furthermore, the front center angle of the magnet flap is the same as the rear center angle of the magnet flap.

[0015] Furthermore, the two adjacent magnets are the first magnet and the second magnet, respectively. The front center angle of the first magnet is greater than the rear center angle of the first magnet, and the front center angle of the second magnet is less than the rear center angle of the second magnet.

[0016] The beneficial effects of this technical solution are as follows: In this utility model, the iron sleeve ensures the rotor magnetic field while providing a mounting base for the magnet segments. Each magnet segment is sequentially fixed on the iron sleeve along the circumference, and the magnetic poles are set in the form of magnet segment structures. Therefore, the adjacent sides of adjacent magnet segments can be directly contacted and attached to each other, avoiding circumferential gaps between adjacent magnet segments. Thus, there is no magnetic field leakage, which can ensure that the rotor magnetic field is utilized to the maximum extent and is conducive to improving motor efficiency.

[0017] Furthermore, in this invention, two adjacent magnet segments are respectively the first magnet segment and the second magnet segment. The front center angle of the first magnet segment is greater than the rear center angle of the first magnet segment, and the front center angle of the second magnet segment is less than the rear center angle of the second magnet segment. That is to say, for each magnet segment, the magnet segment has a trapezoidal structure. The mating surface of two adjacent magnet segments will not correspond exactly to one iron core slot on the stator, but will circumferentially span at least one iron core slot, thus avoiding the problem of large back potential difference of the magnetic field. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the rotating magnetic field DC motor of this utility model; Figure 2 for Figure 1 Schematic diagram of the middle rotor; Figure 3 for Figure 2 Top view of the central rotor; Figure 4 yes Figure 2 Schematic diagram of the connection between the central magnetic steel petal and the iron sleeve; Figure 5 This is a schematic diagram of the rotor structure in Embodiment 2 of the rotating magnetic field DC motor of this utility model; Figure 6 yes Figure 5 Top view; In the diagram: 1. Stator; 2. Stator winding; 3. Magnet lobe; 4. Iron sleeve; 5. Rotor shaft; 6. First magnet lobe; 7. Second magnet lobe; 8. Non-magnetic screw. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0023] Example 1 of the rotating magnetic field DC motor of this utility model is as follows: Figures 1-4 As shown: The system includes a stator 1, a rotor, and a control circuit (not shown in the figure). The stator 1 includes a plurality of iron core slots spaced apart along the circumference. Stator windings 2 are disposed in the iron core slots. The rotating shaft includes a rotor shaft 5 whose axis extends in the front-back direction. At least one pair of magnetic poles are disposed around the outer circumference of the rotor shaft 5. In this embodiment, there are two pairs of magnetic poles.

[0024] The control circuit is used to control the current direction of the corresponding stator winding. Each magnetic pole corresponds to multiple stator windings, such as... Figure 1 As shown, in this embodiment, each N pole corresponds to six stator windings, and each S pole corresponds to six stator windings. The current direction of the six stator windings corresponding to the N pole is opposite to the current direction of the six stator windings corresponding to the S pole. As the magnetic pole rotates circumferentially, the current direction of the corresponding stator winding changes accordingly, thereby continuously generating a force that drives the rotor to rotate.

[0025] All of the above are existing technologies and will not be described in detail here.

[0026] An iron sleeve is fitted onto the rotor shaft. In this embodiment, the iron sleeve 4 is a pure iron sleeve, which is heat-fitted onto the rotor shaft.

[0027] The magnetic poles are made of arc-shaped magnetic steel petals 3. The thickness of the magnetic steel petals 3 is uniform. In this embodiment, from a top view, each magnetic steel petal is a trapezoidal structure. Two adjacent magnetic steel petals are the first magnetic steel petal 6 and the second magnetic steel petal 7, respectively. The front center angle of the first magnetic steel petal 6 is greater than the rear center angle of the first magnetic steel petal. The front center angle of the second magnetic steel petal is less than the rear center angle of the second magnetic steel petal. The front center angle of the first magnetic steel petal is 90~100 degrees, and the rear center angle of the first magnetic steel petal is 80~90 degrees.

[0028] Each magnet 3 is fixed sequentially to the outer periphery of the iron sleeve along the circumference of the iron sleeve. The outer periphery magnetic poles of adjacent magnet 3 are opposite, and the adjacent sides of adjacent magnet 3 are in contact, so that the outer periphery of each magnet 3 forms a continuous circumferential surface structure.

[0029] The iron sleeve is provided with threaded holes corresponding to the magnet segments, and the magnet segments are provided with screw holes corresponding to the threaded holes. In this embodiment, each magnet segment has two screw holes, which are spaced apart along the front-back direction. Non-magnetic screws 8 are inserted into the screw holes and threaded holes to fix the magnet segments to the outer periphery of the iron sleeve. Preferably, the non-magnetic screws are titanium alloy screws.

[0030] In this invention, the adjacent sides of two adjacent magnets are in contact with each other. This results in no leakage of the rotor magnetic field, and the stator magnetic field is always perpendicular to the rotor magnetic field, so that the rotor magnetic field can be utilized to the maximum extent.

[0031] An embodiment 2 of a rotating magnetic field DC motor is shown below. Figures 5-6 As shown, the difference between Embodiment 2 and Embodiment 1 is that, in this embodiment, for each magnet lobe 3, the center angle of the front end of the magnet lobe is the same as the center angle of the rear end of the magnet lobe. Since there are four magnet lobes in this invention, the center angles of both ends of each magnet lobe are 90°. In other embodiments of this invention, the number of pairs of magnetic poles can be set as needed, such as one pair, three pairs, or other pairs.

[0032] Implementation of the rotor of a rotating magnetic field DC motor, for example Figures 1-6 As shown, the rotor structure of the rotating magnetic field DC motor is the same as that of the rotors described in the above embodiments of the rotating magnetic field DC motor, and will not be described in detail here.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A rotor of a rotating magnetic field DC motor, comprising a rotor shaft with its axis extending in a front-rear direction, and at least one pair of magnetic poles disposed around the rotor shaft, characterized in that, An iron sleeve is fitted onto the rotor shaft. The magnetic poles are made of arc-shaped magnetic steel petals. Each magnetic steel petal is fixed sequentially to the outer circumference of the iron sleeve along the circumference. The outer circumferential magnetic poles of adjacent magnetic steel petals are opposite. The adjacent sides of adjacent magnetic steel petals are in contact, so that the outer circumferential surface of each magnetic steel petal forms a continuous circumferential surface structure.

2. The rotor according to claim 1, characterized in that: The iron sleeve is a pure iron sleeve.

3. The rotor according to claim 1, characterized in that: The iron sleeve is provided with threaded holes corresponding to the magnet petals, and the magnet petals are provided with screw holes corresponding to the threaded holes. Non-magnetic screws are inserted into the screw holes and threaded holes to fix the magnet petals to the outer periphery of the iron sleeve.

4. The rotor according to any one of claims 1 to 3, characterized in that: The front center angle of the magnet flap is the same as the rear center angle of the magnet flap.

5. The rotor according to any one of claims 1 to 3, characterized in that: The two adjacent magnets are the first magnet and the second magnet, respectively. The front center angle of the first magnet is greater than the rear center angle of the first magnet, and the front center angle of the second magnet is less than the rear center angle of the second magnet.

6. A rotating magnetic field DC motor, comprising a stator and a rotor, wherein the stator is provided with a plurality of stator windings distributed circumferentially, the rotor includes a rotor shaft with its axis extending in a front-rear direction, and the rotor further includes at least one pair of magnetic poles disposed around the rotor shaft, characterized in that, An iron sleeve is fitted onto the rotor shaft. The magnetic poles are made of arc-shaped magnetic steel petals. Each magnetic steel petal is fixed sequentially to the outer circumference of the iron sleeve along the circumference. The outer circumferential magnetic poles of adjacent magnetic steel petals are opposite. The adjacent sides of adjacent magnetic steel petals are in contact, so that the outer circumferential surface of each magnetic steel petal forms a continuous circumferential surface structure.

7. The rotating magnetic field DC motor according to claim 6, characterized in that: The iron sleeve is a pure iron sleeve.

8. The rotating magnetic field DC motor according to claim 6, characterized in that: The iron sleeve is provided with threaded holes corresponding to the magnet petals, and the magnet petals are provided with screw holes corresponding to the threaded holes. Non-magnetic screws are inserted into the screw holes and threaded holes to fix the magnet petals to the outer periphery of the iron sleeve.

9. The rotating magnetic field DC motor according to any one of claims 6 to 8, characterized in that: The front center angle of the magnet flap is the same as the rear center angle of the magnet flap.

10. The rotating magnetic field DC motor according to any one of claims 6 to 8, characterized in that: The two adjacent magnets are the first magnet and the second magnet, respectively. The front center angle of the first magnet is greater than the rear center angle of the first magnet, and the front center angle of the second magnet is less than the rear center angle of the second magnet.

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