Permanent magnet synchronous motor rotor

Abstract

The utility model discloses a permanent magnet synchronous motor rotor, which belongs to the technical field of motors and comprises a rotor core (1) and magnetic steel. The rotor core (1) comprises a rotor core body (2), a first magnetic steel groove (3) and a second magnetic steel groove (4), the first magnetic steel (5) is arranged in the first magnetic steel groove (3), the second magnetic steel (6) is arranged in the second magnetic steel groove (4), the polarities of the opposite surfaces of the two adjacent second magnetic steel (6) are the same, the polarities of the opposite surfaces of the two adjacent second magnetic steel (6) are the same, and the polarities of the two adjacent first magnetic steel (5) are opposite; according to the utility model, leakage of magnetic flux of the adjacent second magnetic steel (6) out of the rotor can be reduced, the magnetic flux density of the inner side of the rotor is further improved, the torque of the rotor is improved, and the motor efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a rotor, in particular to a permanent magnet synchronous motor rotor. Background Art

[0002] In the Chinese invention patent rotor structure and motor with application date of August 3, 2023 and application number 202310978086.4, a rotor structure is disclosed, including a rotor core, on which a first magnetic steel slot and a second magnetic steel slot are arranged, the first magnetic steel slot is in a straight line shape, and the second magnetic steel slot is in a V-shape, the first magnetic steel slot is located radially outside the second magnetic steel slot, and under the same pole, the second magnetic steel slot is an asymmetric structure with respect to the magnetic pole center line of the pole, and the asymmetric structure can be used to adjust the magnetic circuit on the rotor core, greatly improve the direction of the magnetic circuit on the rotor core, optimize the magnetic circuit structure and air gap magnetic density, reduce radial electromagnetic force, reduce electromagnetic noise and vibration of the motor, and improve motor efficiency.

[0003] In the Chinese invention patent with application date of November 27, 2023 and application number 202311596068.6, the applicant disclosed a permanent magnet synchronous motor rotor punching and rotor with trapezoidal combined magnetic steel slots, including a punching body, a magnetic steel slot group is provided on the outer edge of the punching body, each group of magnetic steel slot groups is trapezoidally arranged, respectively including a first magnetic steel slot, a second magnetic steel slot and a third magnetic steel slot, a first magnetic isolation bridge is provided between the first magnetic steel slot and the second magnetic steel slot, a second magnetic isolation bridge is provided between the first magnetic steel slot and the third magnetic steel slot, a third magnetic isolation bridge is provided between the second magnetic steel slot and the outer peripheral wall of the punching body, and a fourth magnetic isolation bridge is provided between the third magnetic steel slot and the outer peripheral wall of the punching body. The utility model can effectively improve the magnetic properties of the rotor core. Under the condition of the same magnetic amount, the rotor made by the rotor punching of the utility model has better performance, can effectively ensure the entry and exit and circulation of the magnetic circuit, and ensure the performance of the motor.

[0004] However, for the above-mentioned motor rotor, when using the same magnet, how to effectively arrange the magnets, effectively improve the magnetic circuit on the rotor core, and increase the torque of the rotor still needs to be further optimized. Utility Model Content

[0005] The purpose of the utility model is to overcome the technical problem in the prior art of how to effectively arrange the magnets to further improve the magnetic circuit on the rotor core and increase the torque of the rotor, and to provide a permanent magnet synchronous motor rotor that can increase the magnetic field strength inside the motor and further increase the rotor torque.

[0006] In order to solve the above technical problems, the utility model provides a permanent magnet synchronous motor rotor, including a rotor core and a magnetic steel, wherein the rotor core is arranged in a circular ring shape, the rotor core includes a rotor core body and a first magnetic steel slot and a second magnetic steel slot arranged in the core body in a circumferential direction, the first magnetic steel slot and the second magnetic steel slot are arranged alternately, the cross section of the first magnetic steel slot is arranged in a rectangular or tile shape, the length of the first magnetic steel slot in the circumferential direction is greater than the width in the diameter direction passing through the center of the circle, and all the first magnetic steel slots are arranged in a ring shape in the rotor core body; the cross section of the second magnetic steel slot is arranged in a rectangular shape, the length of the second magnetic steel slot in the circumferential direction is less than the width in the diameter direction passing through the center of the circle, the second magnetic steel slot is arranged between adjacent first magnetic steel slots, the magnetic steel includes magnetic steel 1 and magnetic steel 2, the magnetic steel 1 is arranged in the first magnetic steel slot, the magnetic steel 2 is arranged in the second magnetic steel slot, the polarity of the opposite faces of two adjacent magnetic steels 2 is the same, and is also the same as the polarity of the magnetic steel 1 facing the opposite face, and the polarity of the adjacent two magnetic steels 1 is opposite.

[0007] As a further improvement measure of the present invention, in the above-mentioned permanent magnet synchronous motor rotor, the axis of the symmetry axis of the cross section of the second magnetic steel slot is arranged in the diameter direction passing through the center of the circle.

[0008] As a further improvement measure of the present invention, in the above-mentioned permanent magnet synchronous motor rotor, the second magnetic steel slot is provided with an opening, the opening faces the inner circumferential surface of the rotor core body, and the rotor core is provided with a protrusion facing the opening at the opening, and the width of the opening is smaller than the width of the cross section of the second magnetic steel slot.

[0009] As a further improvement measure of the present invention, the above-mentioned permanent magnet synchronous motor rotor is provided with a connecting portion between the second magnetic steel slot and the first magnetic steel slot.

[0010] Compared with the prior art, the beneficial effect of the utility model lies in that: by arranging a first magnetic steel slot arranged in a circumferential ring shape in the rotor core body and arranging a magnetic steel one in the first magnetic steel slot, the magnetic flux leakage of the adjacent magnetic steel two arranged on both sides of the magnetic steel one to the outside of the rotor can be reduced, the magnetic flux density on the inner side of the rotor can be further increased, the torque of the rotor can be increased, and the efficiency of the motor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a top view of the utility model.

[0012] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0013] Figure 3 yes Figure 2 Structural diagram of the rotor core section.

[0014] Figure 4 yes Figure 2 Schematic diagram of the distribution of magnetic field lines.

[0015] Figure 5 It is a relationship curve diagram of voltage, current, speed, torque, output power and efficiency of the utility model.

[0016] Explanation of the accompanying drawings: 1-rotor core, 2-rotor core body, 3-first magnetic steel slot, 4-second magnetic steel slot, 5-magnet one, 6-magnet two, 7-axis of symmetry of the cross section of the second magnetic steel slot, 8-opening, 9-protrusion, 10-connecting part, 21-yoke, 22-tooth part. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0018] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. Those skilled in the art can fully understand the present invention without the description of these details.

[0019] like Figures 1 to 4 A permanent magnet synchronous motor rotor shown includes a rotor core 1 and magnetic steel. The rotor core 1 is arranged in a circular ring shape. The rotor core 1 includes a rotor core body 2. The rotor core body 2 includes a yoke 21 and a tooth portion 22. The rotor core body 2 can be formed by stamping, winding, stacking and welding, or by punching, stacking and welding, or by stacking by self-locking. A first magnetic steel slot 3 and a second magnetic steel slot 4 are arranged in the circumferential direction of the rotor core body 2. The first magnetic steel slot 3 and the second magnetic steel slot 4 are arranged alternately. The first magnetic steel slot 3 is arranged in the rotor core body 2, the first magnetic steel slot 3 is arranged at the yoke 21, and the second magnetic steel slot 4 is arranged at the tooth 22. A connecting portion 10 is arranged between the second magnetic steel slot 4 and the first magnetic steel slot 3. The cross section of the first magnetic steel slot 3 is arranged in a rectangular or tile shape. The length of the first magnetic steel slot 3 in the circumferential direction is greater than the width in the diameter direction passing through the center of the circle. The first magnetic steel slot 3 is arranged in a ring shape in the rotor core body 4; the cross section of the second magnetic steel slot 4 is arranged in a rectangular shape. The length of the second magnetic steel slot 4 in the circumferential direction is less than the width in the diameter direction passing through the center of the circle. The second magnetic steel slot 4 is located between adjacent first magnetic steel slots 3. The radial symmetry axis 7 of the cross section of the second magnetic steel slot is arranged in the diameter direction passing through the center of the circle, so that the second magnetic steel slots 4 are arranged more regularly.

[0020] like Figure 1 , Figure 2 , Figure 3 As shown, the magnetic steel includes magnetic steel 1 5 and magnetic steel 2 6. The magnetic steel 1 5 is arranged in the first magnetic steel groove 3. Magnetic steel glue is arranged on the inner side wall and the bottom of the first magnetic steel groove 3. The magnetic steel 1 5 is fixed in the first magnetic steel groove 3 by the magnetic steel glue.

[0021] The second magnetic steel 6 is arranged in the second magnetic steel slot 4, and the magnetic steel glue is arranged on the inner side wall of the second magnetic steel slot 4, and the second magnetic steel 6 is fixed in the second magnetic steel slot 4 by the magnetic steel glue. The second magnetic steel slot 4 is provided with an opening 8, and the opening 8 faces the inner peripheral surface of the rotor core body 2. The rotor core 1 is provided with a protrusion 9 facing the opening 8 at the opening 8, and the width of the opening 8 is smaller than the width of the cross section of the second magnetic steel slot 4, so that the second magnetic steel 6 can be conveniently inserted into the second magnetic steel slot 4, and the second magnetic steel 6 can be prevented from falling off from the second magnetic steel slot 4, and the opening 8 has a magnetic isolation effect.

[0022] like Figures 1 to 4 As shown, the magnetic steel 1 5 and the magnetic steel 2 6 are both configured as flat magnets, and the magnetic poles of the magnetic steel 1 5 and the magnetic steel 2 6 are distributed on two sides, one side is the N pole and the other side is the S pole. In the present invention, the polarities of the opposite faces of two adjacent magnets 2 6 are the same, that is, the opposite faces are both N poles or S poles, and are also the same as the polarity of the magnet 1 5 facing the opposite faces, that is, in the concave-shaped magnet combination composed of any two adjacent magnets 2 6 and the magnet 1 5 therebetween, the polarities of the three magnets facing the center of the concave shape are the same, that is, the N poles or S poles. Such a design can reduce the leakage of the magnetic flux of the adjacent magnets 2 6 to the outside of the rotor; the polarities of the adjacent magnets 1 5 are opposite, that is, one of the adjacent magnets 1 5 facing the center of the motor rotor is an N pole and the other is an S pole, alternating with each other. The magnets 1 5 and the magnets 2 6 can be arranged in the above manner so that the magnetic pole located between the magnets 1 5 and the magnets 2 6 is the strongest, which can further increase the magnetic flux density on the inner side of the rotor, increase the torque of the rotor, and improve the motor efficiency.

[0023] The motor made by this embodiment is compared with Figure 5 From the voltage, current, speed, torque, output power, and efficiency relationship curve shown in the figure, and the voltage, current, input power, torque, speed, output power, efficiency, and time relationship data table shown in Table 1 (see Table 1), it can be found that when the torque is between 4.65 Nm and 59.70 Nm, the efficiency of the motor is always maintained above 80%, which can improve the motor efficiency.

[0024] Table 1 Voltage, current, input power, torque, speed, output power, efficiency, time relationship data table

[0025]

[0026] The above describes the implementation mode of the utility model in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation mode. For ordinary technicians in this field, several modifications and improvements can be made without departing from the present invention, and these should also be regarded as belonging to the protection scope of the present utility model.

Claims

1. A permanent magnet synchronous motor rotor, comprising a rotor core (1) and magnetic steel, characterized in that: The rotor core (1) is arranged in a circular ring shape, comprising a rotor core body (2) and a first magnetic steel slot (3) and a second magnetic steel slot (4) arranged in the core body in a circumferential direction, the first magnetic steel slot (3) and the second magnetic steel slot (4) being arranged alternately, the cross section of the first magnetic steel slot (3) being arranged in a rectangular or tile shape, the length of the first magnetic steel slot (3) in the circumferential direction being greater than the width in the diameter direction passing through the center of the circle, and all the first magnetic steel slots (3) being arranged in a circular shape in the rotor core body (2); the second magnetic steel slots (4 ) is arranged in a rectangular cross-section, the length of the second magnetic steel slot (4) in the circumferential direction is smaller than the width in the diameter direction passing through the center of the circle, the second magnetic steel slot (4) is arranged between adjacent first magnetic steel slots (3), the magnetic steel comprises magnetic steel one (5) and magnetic steel two (6), the magnetic steel one (5) is arranged in the first magnetic steel slot (3), the magnetic steel two (6) is arranged in the second magnetic steel slot (4), the polarities of the opposite surfaces of two adjacent magnetic steel twos (6) are the same, and the polarity of the magnetic steel one (5) facing the opposite surface is also the same, and the polarity of the adjacent two magnetic steel ones (5) is arranged in opposite directions.

2. A permanent magnet synchronous motor rotor according to claim 1, characterized in that: The axis of symmetry (7) of the cross section of the second magnetic steel slot is arranged in the diameter direction passing through the center of the circle.

3. A permanent magnet synchronous motor rotor according to claim 2, characterized in that: The second magnetic steel slot (4) is provided with an opening (8), the opening (8) faces the inner circumferential surface of the rotor core body (2), and the rotor core (1) is provided with a protrusion (9) facing the opening (8) at the opening (8), and the width of the opening (8) is smaller than the width of the cross section of the second magnetic steel slot (4).

4. A permanent magnet synchronous motor rotor according to claim 3, characterized in that: A connecting portion (10) is provided between the second magnetic steel slot (4) and the first magnetic steel slot (3).

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