A rotor structure of a homopolar induction motor

Abstract

The present invention relates to the field of motor technology, and specifically to a same-polarity induction motor rotor structure, including a rotor shaft, wherein the outer surface of the rotor shaft is sequentially sleeved with a first rotor end cover, a first rotor core, a rotor additional ring, a second rotor core, and a second rotor end cover. The present invention adopts a segmented rotor structure. Compared with the traditional same-polarity induction motor rotor structure, a magnetic bridge structure exists between adjacent salient poles on the outer surface of the segmented rotor core. Under high-speed operation, the existence of the magnetic bridge structure can greatly reduce the rotor wind wear loss. In addition, if the segmented rotor core is formed by stacking silicon steel sheets, the rotor eddy current loss caused by harmonics can also be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a rotor structure of a same-pole induction motor. Background Art

[0002] The same-pole induction motor has stator excitation and no auxiliary structures such as excitation winding or permanent magnet on the rotor. It has the advantages of simple and reliable structure and has broad application prospects in flywheel energy storage, high-speed motors, superconducting motors and other fields.

[0003] The same polarity induction motor uses the slot effect produced by the rotor slots to produce an alternating component in the air gap magnetic permeability, thereby generating an alternating air gap magnetic flux density. The depth of the rotor slot directly affects the size of the alternating component in the air gap magnetic flux density, which in turn affects the electromagnetic performance of the motor. However, in situations where high-speed rotation is required, such as flywheel energy storage, high-speed motors, and superconducting motors, the slotted rotor will produce large wind friction losses when rotating at high speed. The higher the speed, the greater the wind friction loss. On the one hand, this loss reduces the operating efficiency of the motor, and on the other hand, it causes the motor to heat up. In severe cases, the motor will heat up and burn, which seriously restricts the application of this type of motor. Therefore, in order to improve the operating efficiency of the motor, it is necessary to suppress the wind friction loss of this type of motor.

[0004] Therefore, it is urgent to design a same-pole induction motor rotor structure to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a rotor structure of a same-pole induction motor to solve the problem of large wind friction loss mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a rotor structure of a same-pole induction motor, comprising a rotor shaft, the outer surface of which is sequentially sleeved with a first rotor end cover, a first rotor core, a rotor additional ring, a second rotor core and a second rotor end cover.

[0007] Preferably, a certain number of first rotor salient poles are present on the outer surface of the first rotor core, and a first magnetic bridge exists between a first rotor salient pole of the first rotor core and an adjacent first rotor salient pole.

[0008] Preferably, the second rotor core has the same structure as the first rotor core, there are a certain number of second rotor salient poles on the outer surface of the second rotor core, and a second magnetic bridge is provided between adjacent second rotor salient poles, and the axis of the first rotor salient pole on the first rotor core and the axis of the second rotor salient pole on the second rotor core differ by 0 or 180 electrical degrees.

[0009] Preferably, the first rotor end cover, the first rotor core, the rotor additional ring, the second rotor core and the second rotor end cover are coaxially assembled.

[0010] Preferably, the outer diameter of the rotor additional ring is not greater than the outer diameter of the first rotor core, and the inner diameter of the rotor additional ring is equal to the outer diameter of the rotor shaft.

[0011] Preferably, the first rotor end cover and the second rotor end cover have completely the same structural and dimensional parameters, and the first rotor end cover and the second rotor end cover are both made of non-magnetic material.

[0012] Preferably, the outer diameter and the inner diameter of the first rotor end cover are the same as those of the first rotor core.

[0013] Preferably, the first rotor core and the second rotor core are both formed by stacking a plurality of silicon steel sheets.

[0014] Preferably, the rotor shaft is integrally connected and fixed to the rotor additional ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the rotor structure of the same-polarity induction motor adopts a rotor segmented structure. Compared with the rotor structure of the traditional same-polarity induction motor, there is a magnetic bridge structure between adjacent salient poles on the outer surface of the segmented rotor core. Under high-speed operation, the existence of the magnetic bridge structure can greatly reduce the rotor wind wear loss. In addition, if the segmented rotor core is made by punching, it can also effectively reduce the rotor eddy current loss caused by tooth harmonics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0017] Figure 2 It is a schematic side view of the structure of Embodiment 1 of the present invention;

[0018] Figure 3 For the present invention Figure 2 The schematic diagram of the front view and section of the structure at AA in the middle;

[0019] Figure 4 This is a schematic diagram of the structure explosion of the first embodiment of the present invention;

[0020] Figure 5 For the present invention Figure 4 A schematic side view of the structure when the first rotor core and the second rotor core are coaxially assembled;

[0021] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0022] Figure 7 It is a partial exploded schematic diagram of the structure of the second embodiment of the present invention;

[0023] Figure 8It is a schematic front view and cross-sectional view of the structure of the third embodiment of the present invention.

[0024] In the figure: 1. rotor shaft; 2. first rotor end cover; 3. first rotor core; 31. first rotor salient pole; 32. first magnetic bridge; 4. rotor additional ring; 5. second rotor core; 51. second rotor salient pole; 52. second magnetic bridge; 6. second rotor end cover. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-5 , Embodiment 1 provided by the present invention:

[0027] A rotor structure of a same-pole induction motor, see attached Figure 1 , including: a rotor shaft 1 and a first rotor end cover 2, a first rotor core 3, a rotor additional ring 4, a second rotor core 5 and a second rotor end cover 6 which are sequentially sleeved on the rotor shaft 1, the rotor additional ring 4 separates the first rotor core 3 from the second rotor core 5, the first rotor core 3 and the second rotor core 5 have exactly the same size parameters, so that the air gaps on the left and right sides of the induction motor with the same polarity form no-load air gap magnetic fields of equal size and opposite polarity under the action of the excitation magnetic field.

[0028] In this embodiment, see the attached Figure 3 , a half cross-sectional view of a rotor structure of a homopolar induction motor, wherein a rotor shaft 1 is located on the axis of a first rotor end cover 2, a first rotor core 3, a rotor additional ring 4, a second rotor core 5 and a second rotor end cover 6, and the first rotor core 3 and the second rotor core 5 are both made by forging.

[0029] In this embodiment, the rotor core 3 and the rotor core 5 have exactly the same structure and size, and are coaxially assembled, but the corresponding salient pole axes of the two are spaced at an electrical angle of 0 or 180 degrees. Figure 5 .

[0030] Embodiment 2: Based on Embodiment 1, the difference of Embodiment 2 is that: in Embodiment 2, the first rotor core 3 and the second rotor core 5 are both formed by laminating multiple silicon steel sheets, which effectively reduces the rotor eddy current loss caused by harmonics, see Attachment 2. Figure 6-7 .

[0031] Embodiment 3: Based on Embodiment 1, Embodiment 3 is different in that: in order to reduce the complexity of the rotor structure for the homopolar induction motor, the rotor shaft 1 and the rotor additional ring 4 can be an integral structure, see the attached Figure 8 .

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A rotor structure of a same-pole induction motor, comprising a rotor shaft (1), characterized in that: The outer surface of the rotor shaft (1) is sleeved with a first rotor end cover (2), a first rotor iron core (3), a rotor additional ring (4), a second rotor iron core (5) and a second rotor end cover (6) in sequence; A certain number of first rotor salient poles (31) are present on the outer surface of the first rotor core (3), and a first magnetic bridge (32) exists between a first rotor salient pole (31) of the first rotor core (3) and an adjacent first rotor salient pole (31); The second rotor core (5) has the same structure as the first rotor core (3); a certain number of second rotor salient poles (51) are present on the outer surface of the second rotor core (5); second magnetic bridges (52) are provided between adjacent second rotor salient poles (51); and the axis of the first rotor salient pole (31) on the first rotor core (3) and the axis of the second rotor salient pole (51) on the second rotor core (5) differ by 0 or 180 electrical degrees; The outer diameter of the rotor additional ring (4) is not greater than the outer diameter of the first rotor iron core (3), and the inner diameter of the rotor additional ring (4) is equal to the outer diameter of the rotor shaft (1).

2. The same polarity induction motor rotor structure according to claim 1, characterized in that: The rotor end cover comprises a first rotor end cover (2), a first rotor iron core (3), a rotor additional ring (4), a second rotor iron core (5) and a second rotor end cover (6) which are coaxially assembled.

3. The same polarity induction motor rotor structure according to claim 1, characterized in that: The first rotor end cover (2) and the second rotor end cover (6) have completely the same structural and dimensional parameters, and the first rotor end cover (2) and the second rotor end cover (6) are both made of non-magnetic material.

4. The same polarity induction motor rotor structure according to claim 1, characterized in that: The outer diameter and the inner diameter of the first rotor end cover (2) are the same as those of the first rotor core (3).

5. The same polarity induction motor rotor structure according to claim 1, characterized in that: The first rotor iron core (3) and the second rotor iron core (5) are both formed by laminating a plurality of silicon steel sheets.

6. The same polarity induction motor rotor structure according to claim 1, characterized in that: The rotor shaft (1) and the rotor additional ring (4) are integrally connected and fixed.

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