Stator core for a single-rotational motor and motor

Abstract

The utility model provides a kind of stator core and motor for unidirectional rotation motor, the inner periphery of stator core has tooth slot, several tooth slots are interval set along the circumferential direction of stator core, and form stator tooth between adjacent tooth slots, the both sides of the end of stator tooth are magnetic pole and demagnetization pole respectively, the orientation of demagnetization pole is same with the rotation direction of stator core, the orientation of magnetic pole is opposite with the rotation direction of stator core, stator tooth has the first center line that passes the center of stator core, the distance between the end of magnetic pole and the first center line is greater than the distance between demagnetization pole and the first center line.The distance between the end of magnetic pole and the first center line is greater than the distance between demagnetization pole and the first center line, so that the both sides of stator tooth form asymmetric magnetic pole structure, can prevent the magnetic guide harmonic produced by the slot of tooth slot to be in-phase superposition, play the magnetic guide harmonic modulation effect, reduce torque fluctuation;Change the phase of magnetic density distribution, and shift high-frequency loss area from tooth top to yoke part, reduce iron loss.

Description

Technical Field

[0001] This utility model relates to a stator core and motor for a unidirectional rotating motor. Background Technology

[0002] The stator core of a motor is a crucial component, and its slot design significantly impacts motor performance. Traditional stator cores typically employ a symmetrical slot design. While this maintains performance balance during bidirectional rotation, it is not optimal for unidirectional motors. During operation, the unidirectional magnetic field in a unidirectional motor means that a symmetrical slot design may lead to increased iron losses and harmonic distortion, ultimately affecting the motor's efficiency and performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a stator core and motor for a unidirectional rotating motor.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A stator core for a unidirectional rotating motor, the stator core having a circular hole in its center for mounting a rotor, the inner circumferential surface of the stator core having toothed grooves, a plurality of the toothed grooves being spaced apart along the circumferential direction of the stator core, and stator teeth being formed between adjacent toothed grooves, the ends of the stator teeth having a magnetizing pole and a demagnetizing pole on their two sides respectively, the demagnetizing poles being oriented in the same direction as the rotation direction of the stator core, the magnetizing poles being oriented in the opposite direction to the rotation direction of the stator core, the stator teeth having a first center line passing through the center of the stator core, the distance between the end of the magnetizing pole and the first center line being greater than the distance between the demagnetizing pole and the first center line.

[0006] In this design, the stator teeth of the stator core for a unidirectional rotating motor are provided with magnetizing poles and demagnetizing poles. The demagnetizing poles are oriented in the same direction as the rotation of the stator core, while the magnetizing poles are oriented in the opposite direction. The distance between the end of the magnetizing pole and the first center line is greater than the distance between the demagnetizing pole and the first center line, thus forming an asymmetrical magnetic pole structure on both sides of the stator teeth. This prevents the magnetic permeability harmonics generated at the slot opening from superimposing in phase, thereby modulating the magnetic permeability harmonics and reducing torque fluctuations. It also changes the phase of the magnetic flux density distribution and transfers the high-frequency loss region from the tooth tip to the yoke, reducing iron loss. At the same time, the asymmetrical magnetic pole structure on both sides of the stator teeth ensures that the magnetic flux density of the magnetizing poles is not saturated while reducing the amount of magnetic pole material used in the demagnetizing poles.

[0007] Since the orientation of the demagnetizing pole is the same as the rotation direction of the stator core, and the orientation of the magnetizing pole is opposite to the rotation direction of the stator core, when the motor rotates, the magnetic force of the demagnetizing pole at the front end will shift to the magnetizing pole at the rear end. In order to prevent the magnetic force of the demagnetizing pole at the rear end from saturating, the length or area of ​​the demagnetizing pole should be appropriately increased.

[0008] Preferably, the demagnetizing pole has a first inclined surface on the side near the tooth groove, and the first inclined surface forms a first angle with the first center line. The magnetizing pole has a second inclined surface on the side near the tooth groove, and the second inclined surface forms a second angle with the first center line. The first included angle Greater than the second included angle .

[0009] In this scheme, the above-mentioned structural setting is adopted, with the first included angle... Greater than the second included angle The first slope is gentler than the second slope, which increases the tooth inclination angle of the demagnetizing pole, reduces the permeability, weakens the 5th to 7th order spatial harmonics, and at the same time reduces the tooth inclination angle of the magnetizing pole, increases the permeability, and enhances the reverse harmonic cancellation effect.

[0010] Preferably, the first included angle The value range is 50° to 80°.

[0011] In this scheme, by adopting the above parameter settings, the tooth tilt angle of the demagnetized poles can be further optimized, the permeability can be reduced, and the 5th to 7th order spatial harmonics can be weakened. At the same time, it ensures that the magnetized poles have sufficient strength and saves the amount of magnetic pole material used.

[0012] Preferably, the first included angle With the second angle The difference is no greater than 30°.

[0013] In this scheme, the above-mentioned structural configuration is adopted to form a better asymmetrical magnetic pole structure, thereby changing the magnetic flux density distribution, reconstructing the eddy current path, and reducing high-frequency losses; and, the first included angle With the second angle The difference is no more than 30°, which takes into account both the tooth inclination angle of the demagnetizing pole and the magnetizing pole, and can improve the permeability of the magnetizing pole while reducing the permeability of the demagnetizing pole, thereby reducing the impact of reverse harmonics.

[0014] Preferably, the thickness of the demagnetizing pole end along the radial direction of the stator core is less than the thickness of the magnetizing pole end along the radial direction of the stator core.

[0015] In this scheme, the above-mentioned structural configuration is adopted to form a better asymmetric magnetic pole structure, thereby changing the magnetic flux density distribution, reconstructing the eddy current path, and reducing high-frequency loss.

[0016] Preferably, the thickness of the demagnetizing end along the radial direction of the stator core ranges from 0.3 to 0.8 mm.

[0017] In this scheme, the above-mentioned structural configuration is adopted to form a better asymmetric magnetic pole structure, thereby changing the magnetic flux density distribution, reconstructing the eddy current path, and reducing high-frequency loss.

[0018] Preferably, the thickness of the end of the magnetizing pole along the radial direction of the stator core ranges from 1 to 1.3 mm.

[0019] In this scheme, the above-mentioned structural configuration is adopted to form a better asymmetric magnetic pole structure, thereby changing the magnetic flux density distribution, reconstructing the eddy current path, and reducing high-frequency loss.

[0020] Preferably, the tooth groove has a second center line passing through the center of the stator core, and the distance between the end of the demagnetizing pole and the second center line is greater than the distance between the end of the adjacent magnetizing pole and the second center line.

[0021] In this scheme, the above-mentioned structural configuration is adopted to form an asymmetrical groove distribution, which prevents the magnetic permeability harmonics generated at the groove openings from superimposing in phase, thereby playing a role in magnetic permeability harmonic modulation and reducing torque fluctuation.

[0022] Preferably, the distance between the end of the demagnetizing pole and the second center line is... for The distance between the end of the adjacent magnetizing pole and the second center line for ,

[0023] in, Where K is the diameter of the winding copper wire, the value of K ranges from 0.18 to 0.22, D is the inner diameter of the stator core, Z is the number of slots, and P is the number of pole pairs.

[0024] In this scheme, the above-mentioned structural configuration is adopted to form a better asymmetrical groove distribution, which prevents the magnetic permeability harmonics generated at the groove openings from superimposing in phase, thereby playing a role in magnetic permeability harmonic modulation and reducing torque fluctuation.

[0025] An electric motor comprising a stator core for a unidirectional rotating motor as described above.

[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0027] The positive and progressive effects of this utility model are as follows: the stator teeth of the stator core for a unidirectional rotating motor are provided with magnetizing poles and demagnetizing poles. The orientation of the demagnetizing poles is the same as the rotation direction of the stator core, and the orientation of the magnetizing poles is opposite to the rotation direction of the stator core. The distance between the end of the magnetizing pole and the first center line is greater than the distance between the demagnetizing pole and the first center line, so that the two sides of the stator teeth form an asymmetrical magnetic pole structure. This can prevent the magnetic permeability harmonics generated at the slot opening from superimposing in phase, play a role in magnetic permeability harmonic modulation, and reduce torque fluctuation. It can also change the phase of the magnetic flux density distribution and transfer the high-frequency loss region from the tooth tip to the yoke, thereby reducing iron loss. At the same time, the asymmetrical magnetic pole structure on both sides of the stator teeth not only ensures that the magnetic flux density of the magnetizing poles is not saturated, but also reduces the amount of magnetic pole material used in the demagnetizing poles. Since the orientation of the demagnetizing pole is the same as the rotation direction of the stator core, and the orientation of the magnetizing pole is opposite to the rotation direction of the stator core, when the motor rotates, the magnetic force of the demagnetizing pole at the front end will shift to the magnetizing pole at the rear end. In order to prevent the magnetic force of the demagnetizing pole at the rear end from saturating, the length or area of ​​the demagnetizing pole should be appropriately increased. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the stator core of a unidirectional rotating electric motor according to a preferred embodiment of the present invention. Figure 1 .

[0029] Figure 2 This is a schematic diagram of the stator core of a unidirectional rotating electric motor according to a preferred embodiment of the present invention. Figure 2 .

[0030] Figure 3 for Figure 2 Enlarged view of section A.

[0031] Explanation of reference numerals in the attached figures:

[0032] Stator core 100

[0033] 200mm round hole

[0034] Gear 10

[0035] Stator teeth 20

[0036] Magnetic pole 201

[0037] Second Incline 2011

[0038] Demagnetizing 202

[0039] First slope 2021

[0040] Rotation direction 300

[0041] First centerline 400

[0042] Second centerline 500 Detailed Implementation

[0043] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0044] like Figures 1-3 As shown, this embodiment discloses a stator core for a unidirectional rotating motor. The stator core 100 has a circular hole 200 in the middle for mounting a rotor. The inner circumferential surface of the stator core 100 has grooves 10. Several grooves 10 are spaced apart along the circumferential direction of the stator core 100. Stator teeth 20 are formed between adjacent grooves 10. The two sides of the end of the stator teeth 20 are a magnetizing pole 201 and a demagnetizing pole 202, respectively. The orientation of the demagnetizing pole 202 is the same as the rotation direction 300 of the stator core 100, and the orientation of the magnetizing pole 201 is opposite to the rotation direction 300 of the stator core 100. The stator teeth 20 have a first center line 400 passing through the center of the stator core 100. The distance between the end of the magnetizing pole 201 and the first center line 400 is greater than the distance between the demagnetizing pole 202 and the first center line 400.

[0045] In this embodiment, the stator teeth 20 of the stator core 100 for a unidirectional rotating motor are provided with magnetizing poles 201 and demagnetizing poles 202. The orientation of the demagnetizing poles 202 is the same as the rotation direction 300 of the stator core 100, while the orientation of the magnetizing poles 201 is opposite to the rotation direction 300 of the stator core 100. The distance between the end of the magnetizing pole 201 and the first center line 400 is greater than the distance between the demagnetizing pole 202 and the first center line 400, so that an asymmetrical magnetic pole structure is formed on both sides of the stator teeth 20. This can prevent the magnetic harmonics generated at the slot opening of the tooth groove 10 from being superimposed in phase, thereby playing a role in magnetic harmonic modulation and reducing torque fluctuation. It can also change the phase of the magnetic flux density distribution and transfer the high-frequency loss region from the tooth tip to the yoke, thereby reducing iron loss. At the same time, the asymmetrical magnetic pole structure on both sides of the stator teeth 20 not only ensures that the magnetic flux density of the magnetizing poles 201 is not saturated, but also reduces the amount of magnetic pole material used in the demagnetizing poles 202.

[0046] In this embodiment, since the orientation of the demagnetizing pole 202 is the same as the rotation direction 300 of the stator core 100, and the orientation of the magnetizing pole 201 is opposite to the rotation direction 300 of the stator core 100, when the motor rotates, the magnetic force of the demagnetizing pole 202 at the front end will shift to the magnetizing pole 201 at the rear end. In order to prevent the magnetic force of the demagnetizing pole 202 at the rear end from saturating, the length or area of ​​the demagnetizing pole 202 is appropriately increased.

[0047] like Figure 2 As shown, the demagnetizing pole 202 has a first inclined surface 2021 on the side near the tooth groove 10, and the first inclined surface 2021 forms a first angle with the first center line 400. The magnetic pole 201 has a second inclined surface 2011 on the side near the tooth groove 10, and the second inclined surface 2011 forms a second angle with the first center line 400. First included angle Greater than the second included angle The first inclined plane 2021 is gentler than the second inclined plane 2011, which increases the tooth inclination angle of the demagnetizing pole 202, reduces the permeability, weakens the 5th to 7th order spatial harmonics, and at the same time reduces the tooth inclination angle of the magnetizing pole 201, increases the permeability, and enhances the reverse harmonic cancellation effect.

[0048] Preferably, the first included angle The value range is 50°~80°, which can further optimize the tooth inclination angle of the demagnetizing pole 202, reduce the permeability, weaken the 5th to 7th order spatial harmonics, and at the same time ensure that the demagnetizing pole 202 has sufficient strength while saving the amount of magnetic pole material.

[0049] More preferably, the first included angle With the second angle The difference is no greater than 30°, forming a better asymmetric magnetic pole structure to change the magnetic flux density distribution, thereby reconstructing the eddy current path and reducing high-frequency losses; and, the first included angle With the second angle The difference is no greater than 30°, which takes into account the tooth inclination angle of demagnetizing pole 202 and magnetizing pole 201, and can improve the permeability of magnetizing pole 201 while reducing the permeability of demagnetizing pole 202, thereby reducing the impact of reverse harmonics.

[0050] In this embodiment, the thickness h01 of the end of the demagnetizing pole 202 along the radial direction of the stator core 100 is less than the thickness h02 of the end of the magnetizing pole 201 along the radial direction of the stator core 100, forming a better asymmetric magnetic pole structure to change the magnetic flux density distribution, thereby reconstructing the eddy current path and reducing high-frequency loss.

[0051] Preferably, the thickness h01 of the end of the demagnetizing pole 202 along the radial direction of the stator core 100 ranges from 0.3 to 0.8 mm, forming a better asymmetrical magnetic pole structure to change the magnetic flux density distribution, thereby reconstructing the eddy current path and reducing high-frequency loss.

[0052] Preferably, the thickness h02 of the end of the magnetizing pole 201 along the radial direction of the stator core 100 ranges from 1 to 1.3 mm, forming a better asymmetrical magnetic pole structure to change the magnetic flux density distribution, thereby reconstructing the eddy current path and reducing high-frequency loss.

[0053] In this embodiment, the slot 10 has a second center line 500 passing through the center of the stator core 100, and the portion of the slot 10 near the outer side is symmetrical with respect to the second center line 500. The distance between the end of the demagnetizing pole 202 and the second center line 500 is greater than the distance between the end of the adjacent magnetizing pole 201 and the second center line 500, forming an asymmetrical slot distribution of the slot 10. This prevents the magnetic permeability harmonics generated at the slot openings of the slot 10 from superimposing in phase, thereby playing a role in magnetic permeability harmonic modulation and reducing torque fluctuations.

[0054] In this embodiment, the distance between the end of the demagnetizing pole 202 and the second center line 500 is... for The distance between the end of the adjacent magnetizing pole 201 and the second center line 500 for ,in, Where K is the diameter of the winding copper wire, the value of K ranges from 0.18 to 0.22, D is the inner diameter of the stator core 100, Z is the number of magnetic slots, and P is the number of pole pairs. This forms a better asymmetric slot distribution of the slots 10, preventing the magnetic harmonics generated at the slots of the slots 10 from superimposing in phase, thus playing a role in magnetic harmonic modulation and reducing torque fluctuation.

[0055] This embodiment also discloses an electric motor, which includes a stator core for a unidirectional rotating motor as described above.

[0056] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 utility model 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 utility model.

[0057] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A stator core for a unidirectional rotating electric motor, wherein the stator core has a circular hole in its center for mounting a rotor, characterized in that, The inner circumferential surface of the stator core has grooves, and a plurality of grooves are spaced apart along the circumferential direction of the stator core. Stator teeth are formed between adjacent grooves. The two sides of the end of the stator teeth are respectively a magnetizing pole and a demagnetizing pole. The orientation of the demagnetizing pole is the same as the rotation direction of the stator core, and the orientation of the magnetizing pole is opposite to the rotation direction of the stator core. The stator teeth have a first center line passing through the center of the stator core, and the distance between the end of the magnetizing pole and the first center line is greater than the distance between the demagnetizing pole and the first center line.

2. The stator core for a unidirectional rotating electric motor as described in claim 1, characterized in that, The demagnetizing pole has a first inclined surface on the side near the tooth groove, and the first inclined surface forms a first angle with the first center line. The magnetizing pole has a second inclined surface on the side near the tooth groove, and the second inclined surface forms a second angle with the first center line. The first included angle Greater than the second included angle .

3. The stator core for a unidirectional rotating electric motor as described in claim 2, characterized in that, The first included angle The value range is 50° to 80°.

4. The stator core for a unidirectional rotating electric motor as described in claim 3, characterized in that, The first included angle With the second angle The difference is no greater than 30°.

5. The stator core for a unidirectional rotating electric motor as described in claim 1, characterized in that, The thickness of the demagnetizing pole end along the radial direction of the stator core is less than the thickness of the magnetizing pole end along the radial direction of the stator core.

6. The stator core for a unidirectional rotating electric motor as described in claim 5, characterized in that, The thickness of the demagnetizing pole end along the radial direction of the stator core ranges from 0.3 to 0.8 mm.

7. The stator core for a unidirectional rotating electric motor as described in claim 5, characterized in that, The thickness of the end of the magnetizing pole along the radial direction of the stator core ranges from 1 to 1.3 mm.

8. The stator core for a unidirectional rotating electric motor as described in claim 1, characterized in that, The tooth groove has a second center line passing through the center of the stator core, and the distance between the end of the demagnetizing pole and the second center line is greater than the distance between the end of the adjacent magnetizing pole and the second center line.

9. The stator core for a unidirectional rotating electric motor as described in claim 8, characterized in that, The distance between the demagnetizing pole end and the second center line for The distance between the end of the adjacent magnetizing pole and the second center line for , in, Where K is the diameter of the winding copper wire, the value of K ranges from 0.18 to 0.22, D is the inner diameter of the stator core, Z is the number of slots, and P is the number of pole pairs.

10. An electric motor, characterized in that, The motor includes a stator core for a unidirectional rotating motor as described in any one of claims 1-9.

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