Motor rotor without magnetic isolation bridge

Abstract

The utility model discloses a motor rotor without a magnetic isolation bridge, which comprises a rotor sleeved on a transmission shaft, the outer ring of the rotor is wrapped by a layer of carbon fiber sleeve, the rotor comprises an iron core base body in a hexagonal star shape, and the iron core base body is provided with weight-reducing heat dissipation holes which are arranged along the length extension direction of the transmission shaft in the same direction. A concave part between any two corners of the iron core base body is matched with a pole piece which is matched with the iron core base body in shape and does not make direct contact with the iron core base body, a V-shaped gap groove is formed between the iron core base body and the pole piece, a first magnet and a second magnet are arranged in the gap groove, and a large auxiliary heat dissipation groove is further formed in the pole piece; according to the utility model, a layer of protective carbon fiber sleeve is additionally arranged on the outer ring of the rotor of the original permanent magnet synchronous motor, and a magnetic isolation bridge influencing the performance is removed or thinned, so that the magnetic flux of the rotor is increased, and the efficiency, the torque density or the high-speed power of the motor are improved; and the carbon fiber sleeve protects the rotor during high-speed rotation, so that the risk of demagnetization of the magnetic steel can be reduced, and centrifugal deformation at a high rotating speed can be reduced.

Description

Technical Field

[0001] The utility model relates to a circulating cooling system, in particular to a motor rotor without a magnetic isolation bridge. Background Art

[0002] With the rapid development of new energy electric vehicles, the electric drive system, as one of the "three electrics" (battery, motor, and electronic control), plays a vital role in new energy electric vehicles. It is not only related to the acceleration performance, but also closely related to the noise and stability of vehicle operation. It is a key component second only to the battery.

[0003] Complete vehicle manufacturers in most countries use embedded permanent magnet synchronous motors as the driving power source for electric vehicles. The advantages are high operating efficiency and high torque density. In order to prevent the permanent magnets from being thrown away under high-speed centrifugal force, the edge of the pole piece will be designed to have a certain thickness, and this thickness is called the magnetic isolation bridge. However, the magnetic isolation bridge will form a closed magnetic field due to the direction of the magnetic force. This closed magnetic field is an invalid magnetic field that does not participate in any action, collectively referred to as leakage magnetic field. Therefore, as long as the magnetic isolation bridge is made thinner, the magnetic flux of the motor can be increased, and the efficiency will be greatly improved. However, the setting without a magnetic isolation bridge has the problem of easy deformation of the structure, and the heat dissipation of the rotor of a high-performance motor is also a major problem that restricts performance.

[0004] For this purpose, we provide a motor rotor without a magnetic bridge, which can achieve the desired efficiency, torque density or high-speed power, and has a stable structure and good heat dissipation performance. Utility Model Content

[0005] In order to solve the deficiencies existing in the above-mentioned technology, the utility model provides a motor rotor without a magnetic isolation bridge.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: it includes a rotor sleeved on the transmission shaft, the outer ring of the rotor is wrapped with a layer of carbon fiber sleeve, the rotor includes an iron core matrix formed in a hexagram shape, the iron core matrix is ​​provided with weight-reducing and heat-dissipating holes arranged in the same direction along the length extension direction of the transmission shaft, the depression between any two corners of the iron core matrix is ​​equipped with a pole piece with a matching shape and not in direct contact, and a V-shaped gap groove is formed between the iron core matrix and the pole piece, the gap groove is arranged with a first magnet and a second magnet, and a large auxiliary heat dissipation groove is also provided on the pole piece.

[0007] Furthermore, the rotor is arranged to rotate relative to the stator with the transmission shaft as the axis.

[0008] Furthermore, the carbon fiber sleeve is completely wrapped around the outer circumference of the rotor in a manner of being pre-stretched to form tension.

[0009] Furthermore, the thickness of the carbon fiber sleeve is 0.5mm-1mm.

[0010] Furthermore, there are a plurality of weight-reducing and heat-dissipating holes, and the plurality of weight-reducing and heat-dissipating holes are implemented in a form of a ring array around the transmission shaft as the axis.

[0011] Furthermore, the core base is provided with oil circulation holes arranged in the same direction along the length extension direction of the transmission shaft. Several oil circulation holes are implemented in the form of a circular array around the transmission shaft as the axis. The straight-line distance from the oil circulation hole to the center point of the transmission shaft is greater than the straight-line distance from the weight-reducing and heat-dissipating hole to the center point of the transmission shaft.

[0012] Furthermore, a gap is formed between the first magnet and the second magnet.

[0013] Furthermore, a portion of the core substrate located in the gap groove is formed with an embedding groove for clamping the first magnet and the second magnet.

[0014] Furthermore, a large auxiliary heat dissipation groove is provided in the middle of the outer peripheral surface of the pole piece.

[0015] The utility model discloses a motor rotor without a magnetic isolation bridge. A protective carbon fiber sleeve is added to the outer ring of the rotor of the original permanent magnet synchronous motor, and the magnetic isolation bridge that affects the performance is removed or thinned, thereby increasing the rotor magnetic flux and improving the efficiency, torque density or high-speed power of the motor. The carbon fiber sleeve of the outer ring protects the rotor under high-speed rotation, which can reduce the risk of magnetic steel demagnetization and reduce centrifugal deformation under high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an axial cross section of the utility model.

[0017] Figure 2 It is a schematic diagram of the three-dimensional assembly structure of the utility model.

[0018] In the figure: 1. rotor; 2. transmission shaft; 3. core matrix; 4. pole piece; 5. first magnet; 6. second magnet; 7. gap groove; 8. through gap; 9. embedded groove; 10. large auxiliary heat dissipation groove; 11. oil circulation hole; 12. weight reduction heat dissipation hole; 13. carbon fiber sleeve. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figure 1-2As shown together, this embodiment is about the motor rotor without a magnetic isolation bridge, and the specific display of conventional supporting components such as windings is omitted in the accompanying drawings; this embodiment includes a rotor 1 sleeved on a transmission shaft 2, the outer ring of the rotor 1 is wrapped with a layer of carbon fiber sleeve 13, the rotor 1 includes a core matrix 3 formed in a hexagram shape, the core matrix 3 is provided with weight-reducing and heat-dissipating holes 12 arranged in the same direction along the length extension direction of the transmission shaft 2, the depression between any two corners of the core matrix 3 is equipped with a pole piece 4 with a matching shape and not in direct contact, then a V-shaped gap groove 7 is formed between the core matrix 3 and the pole piece 4, the gap groove 7 is arranged with a first magnet 5 and a second magnet 6, and a large auxiliary heat-dissipating groove 10 is also provided on the pole piece 4.

[0021] Preferably, the rotor 1 is rotatably arranged relative to the stator with the transmission shaft 2 as the axis.

[0022] Preferably, the carbon fiber sleeve 13 is pre-stretched to form tension and completely covers and wraps around the outer circumference of the rotor 1. The carbon fiber sleeve 13 is a winding fiber sleeve, and the rotor 1 is wrapped with a certain tension through the existing guide roller, so that the components of the rotor 1 are integrated. During the operation of the rotor 1, it not only has the centrifugal force of rotation, but also has the heat generated by the magnetic flux. The carbon fiber sleeve 13 is used to wrap the rotor to avoid structural deformation of the rotor 1, and the carbon fiber of the carbon fiber sleeve 13 does not expand when heated, so as to prevent the reduction of the wrapping ability after heating, and even the risk of adverse falling off.

[0023] Furthermore, the thickness of the carbon fiber sleeve 13 is 0.5 mm-1 mm.

[0024] Preferably, there are several weight-reducing and heat-dissipating holes 12, and the several weight-reducing and heat-dissipating holes 12 are implemented in the form of a circular array around the transmission shaft 2 as the axis. It can be understood that the weight-reducing and heat-dissipating holes 12 reduce the weight of the core matrix 3 by subtraction to achieve the goal of lightweighting, and also achieve the purpose of heat dissipation through the weight-reducing and heat-dissipating holes 12.

[0025] The core base 3 is also provided with oil circulation holes 11 arranged in the same direction as the length extension direction of the transmission shaft 2. A plurality of oil circulation holes 11 are implemented in the form of a circular array around the transmission shaft 2 as the axis. The straight-line distance from the oil circulation holes 11 to the center point of the transmission shaft 2 is greater than the straight-line distance from the weight-reducing and heat-dissipating holes 12 to the center point of the transmission shaft 2. By separating the oil circulation holes 11 from the weight-reducing and heat-dissipating holes 12, the structural rigidity of the core base 3 is protected and stress collapse caused by too many openings is prevented.

[0026] A through gap 8 is also formed between the first magnet 5 and the second magnet 6. Compared with the conventional design with a magnetic isolation bridge, the first magnet 5 and the second magnet 6 of this embodiment use a through gap 8 to replace the magnetic isolation bridge, thereby reducing magnetic leakage and indirectly increasing the magnetic flux. Similarly, the conventional magnetic isolation bridge design is also eliminated between the first magnet 5, the second magnet 6 and the carbon fiber sleeve 13 on their respective sides, thereby forming a spare gap. The spare gap allows the magnetic flux to enter the stator from the rotor 1, minimizing the permanent magnetic flux loss, which is beneficial to improving the efficiency, torque density or high-speed power of the motor.

[0027] In order to make the first magnet 5 and the second magnet 6 fixed more firmly, the part of the core base 3 located in the gap groove 7 is formed with an embedding groove 9 for clamping the first magnet 5 and the second magnet 6, and the embedding groove 9 has a physical blocking effect on the centrifugal force.

[0028] In addition, a large auxiliary heat dissipation groove 10 is provided in the middle of the outer peripheral surface of the pole piece 4 , and heat is dissipated through the large auxiliary heat dissipation groove 10 .

[0029] In this way, the motor rotor without magnetic isolation bridge disclosed by the utility model adds a layer of protective carbon fiber sleeve 13 to the outer ring of the rotor 1 of the original permanent magnet synchronous motor, and at the same time removes or thins the magnetic isolation bridge that affects the performance, thereby increasing the rotor magnetic flux and improving the efficiency, torque density or high-speed power of the motor; the carbon fiber sleeve 13 of the outer ring protects the rotor 1 under high-speed rotation, which can reduce the risk of magnetic steel demagnetization and reduce centrifugal deformation under high speed.

[0030] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A motor rotor without a magnetic bridge, characterized in that: The invention comprises a rotor (1) sleeved on a transmission shaft (2), the outer ring of the rotor (1) being wrapped with a carbon fiber sleeve (13), the rotor (1) comprising an iron core matrix (3) formed in a hexagram shape, the iron core matrix (3) being provided with weight-reducing heat dissipation holes (12) arranged in the same direction as the length extension direction of the transmission shaft (2), a pole piece (4) having a matching shape and not in direct contact is matched at a recess between any two corners of the iron core matrix (3), a V-shaped gap groove (7) is formed between the iron core matrix (3) and the pole piece (4), a first magnet (5) and a second magnet (6) are arranged in the gap groove (7), and a large auxiliary heat dissipation groove (10) is also provided on the pole piece (4).

2. The motor rotor without magnetic bridge according to claim 1 is characterized in that: The rotor (1) is arranged to rotate relative to the stator with the transmission shaft (2) as the axis.

3. The motor rotor without magnetic bridge according to claim 1 is characterized in that: The carbon fiber sleeve (13) is completely covered and wrapped around the outer circumference of the rotor (1) in a manner of pre-stretching to form tension.

4. The motor rotor without magnetic bridge according to claim 3 is characterized in that: The thickness of the carbon fiber sleeve (13) is 0.5 mm-1 mm.

5. The motor rotor without magnetic bridge according to claim 1, characterized in that: The number of the weight-reducing and heat-dissipating holes (12) is a plurality, and the plurality of weight-reducing and heat-dissipating holes (12) are implemented in the form of a ring array around the transmission shaft (2) as the axis.

6. The motor rotor without magnetic bridge according to claim 1, characterized in that: The core substrate (3) is also provided with oil circulation holes (11) arranged in the same direction as the length extension direction of the transmission shaft (2); a plurality of oil circulation holes (11) are arranged in a circular array around the transmission shaft (2) as the axis; and the straight-line distance from the oil circulation holes (11) to the center point of the transmission shaft (2) is greater than the straight-line distance from the weight-reducing and heat-dissipating holes (12) to the center point of the transmission shaft (2).

7. The motor rotor without magnetic bridge according to claim 1, characterized in that: A through gap (8) is formed between the first magnet (5) and the second magnet (6).

8. The motor rotor without magnetic bridge according to claim 6, characterized in that: The portion of the iron core matrix (3) located in the gap groove (7) is formed with an embedding groove (9) for clamping the first magnet (5) and the second magnet (6).

9. The motor rotor without magnetic bridge according to claim 1, characterized in that: The large auxiliary heat dissipation groove (10) is arranged in the middle of the outer peripheral surface of the pole piece (4).

Images