CN211981603U - Permanent magnet motor rotor and permanent magnet motor - Google Patents

Abstract

The utility model discloses a permanent magnet motor rotor and a permanent magnet motor. The permanent magnet motor rotor includes: a rotor iron core, a V-shaped magnetic steel slot uniformly arranged on the rotor iron core, and a magnetic steel assembled on the V-shaped magnetic steel slot; the rotor iron core is provided with a magnetic steel Bridge protrusions, the magnetic bridge protrusions are arranged on the outside of the V-shaped magnetic steel grooves near the q-axis of the rotor, the permanent magnet motor rotor optimizes the shape of the magnetic bridge to optimize the magnetic circuit of the motor and reduce the impact of various working conditions. The iron loss is greatly improved, and the motor drive efficiency and motor speed are greatly improved to meet the driving needs of new energy vehicles.

Description

Permanent magnet motor rotor and permanent magnet motor

technical field

The utility model relates to the technical field of new energy vehicles, in particular to a permanent magnet motor rotor and a permanent magnet motor.

Background technique

With the development of new energy vehicles, new energy vehicles have put forward higher and higher requirements for various aspects of the performance of the drive motor (such as the efficiency, speed and NVH performance of the drive motor).

At present, the rotor structure of the drive motor generally adopts a rotor structure with a single "V"-shaped magnetic steel arrangement. Among them, the rotor structure with a single V-shaped magnetic steel arrangement includes two magnet steels arranged in a "V" shape under each magnetic pole. However, the rotor structure with a single "V"-shaped magnetic steel arrangement currently has the following problems :

1) The weight of a single piece of magnetic steel is relatively high, and it is difficult to solve the problem of rotor strength under high speed;

2) The ability to resist armature reaction is weak. Under the condition of deep field weakening, the magnetic field distortion is large, and the harmonic content increases, which leads to an increase in the iron loss of the motor and reduces the efficiency of the drive motor.

Utility model content

In order to solve the above technical problems, the current rotor structure with a single "V"-shaped magnetic steel arrangement has the problems of large iron loss of the motor and low efficiency of the driving motor.

The embodiment of the present utility model provides a permanent magnet motor rotor, comprising: a rotor iron core, a V-shaped magnetic steel slot evenly arranged on the rotor iron core, and a magnetic steel assembled on the V-shaped magnetic steel slot; The rotor iron core is provided with a magnetic bridge protrusion, and the magnetic bridge protrusion is arranged on the outside of the V-shaped magnetic steel groove at a position close to the q-axis of the rotor.

Preferably, the V-shaped magnetic steel slot includes a first V-shaped magnetic steel slot and a second V-shaped magnetic steel slot; the first distance from the first V-shaped magnetic steel slot to the edge of the rotor core is greater than all the second distance from the second V-shaped magnetic steel slot to the edge of the rotor core.

Preferably, the included angle of the first V-shaped magnetic steel groove ranges from 82° to 125°.

Preferably, the included angle of the second V-shaped magnetic steel groove ranges from 140° to 160°.

Preferably, the magnetic bridge protrusions are arc-shaped protrusions.

Preferably, the rotor iron core is provided with a first arc recess extending from one end of the magnetic bridge protrusion and a second arc recess extending from the other end of the magnetic bridge protrusion.

Preferably, the angle between the line connecting the center of the arc-shaped protrusion and the center of the rotor iron core and the d-axis of the rotor ranges from 15° to 17°.

Preferably, the diameter of the arc-shaped protrusion is in the range of 1/3-4/5 of the length of the air gap contour line of the V-shaped magnetic steel groove toward the air gap side.

Preferably, the area of the arc-shaped protrusion occupies 2/3-1/5 of the area of the circle.

The permanent magnet motor rotor disclosed by the utility model comprises a rotor iron core, a V-shaped magnetic steel slot uniformly arranged on the rotor iron core, and a magnetic steel assembled on the V-shaped magnetic steel slot. The magnetic bridge protrusion is provided on the rotor iron core, and the magnetic bridge protrusion is arranged on the outside of the V-shaped magnetic steel slot near the q-axis of the rotor to optimize the shape of the magnetic bridge, thereby optimizing the magnetic circuit of the motor and reducing the operating conditions of the motor. The iron loss is greatly improved, and the motor drive efficiency and motor speed are greatly improved to meet the driving needs of new energy vehicles.

The embodiment of the present invention provides a permanent magnet motor, which includes a permanent magnet motor stator and the above-mentioned permanent magnet motor rotor.

The permanent magnet motor disclosed by the utility model comprises a permanent magnet motor stator and the above-mentioned permanent magnet motor rotor. The iron loss, torque fluctuation and motor noise of the permanent magnet motor under various working conditions can be effectively reduced, and the motor performance is improved. Therefore, it can meet the trend of high-speed drive motors of new energy vehicles.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only of the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of a permanent magnet motor rotor in an embodiment of the present invention;

2 is another schematic diagram of a permanent magnet motor rotor in an embodiment of the present invention;

1. Rotor iron core; 11. Rotor q-axis; 12. Rotor d-axis; 2. Magnetic bridge protrusion; 21. First arc concave position; 22. Second arc concave position; 23. Vertical short sideline; 31 , the first V-shaped magnetic steel slot; 32, the second V-shaped magnetic steel slot; A, the center of the rotor core; a, the standard line of the center of the circle; 41, the first magnetic steel; 42, the second magnetic steel; 5, the air gap outline.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present 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 used to explain the present invention, and are not intended to limit the present invention.

In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear" , "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings , is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The utility model provides a permanent magnet motor rotor, as shown in FIG. 1 , the permanent magnet motor rotor includes a rotor iron core 1 , a V-shaped magnetic steel slot uniformly arranged on the rotor iron core 1 , and a V-shaped magnetic steel slot assembled on the V-shaped magnetic steel groove. The magnetic steel on the steel slot; the rotor iron core 1 is provided with a magnetic bridge protrusion 2, and the magnetic bridge protrusion 2 is arranged on the outside of the V-shaped magnetic steel groove at a position close to the q-axis 11 of the rotor.

Specifically, the figure shows a specific schematic diagram of one magnetic pole in the rotor of the permanent magnet motor in this embodiment. The rotor of the permanent magnet motor includes at least one magnetic pole, which is evenly distributed on the rotor core 1 along the circumferential direction of the rotor. Each magnetic pole includes a V-shaped magnetic steel slot and a magnetic steel assembled on the V-shaped magnetic steel slot. A magnetic bridge protrusion 2 is arranged on the core 1 near the q-axis 11 of the rotor to optimize the shape of the magnetic bridge, thereby optimizing the magnetic circuit of the motor and reducing the iron loss under various working conditions.

Among them, the magnetic steel is a cuboid, and the edges are rounded. At the same time, the area where the magnetic steel is assembled in the V-shaped magnetic steel groove is matched with the shape of the magnetic steel, so that the magnetic steel is assembled on the V-shaped magnetic steel groove, thereby dispersing the stress and ensuring the Die stamping life.

Understandably, in the high-speed field weakening condition or the no-load condition, the internal magnetic field of the motor is weak, and the magnetic bridge protrusion 2 widens the magnetic bridge, weakening the main magnetic field at this time, thereby reducing the iron caused by the main magnetic field. damage. Under the condition of high torque, the internal magnetic field of the motor is strong, the magnetic flux of the magnetic bridge part after optimizing the shape of the magnetic bridge is saturated, and the magnetic flux leakage is limited, and the main magnetic field and the stator magnetic field can be fully interlinked, so the motor torque can be fully exerted and the magnetic field is affected by the magnetic field. Bridge bump 2 has less influence. Among them, the internal magnetic field of the motor includes the main magnetic field and the stator magnetic field; the main magnetic field is the magnetic field generated by the rotor; the stator magnetic field is the magnetic field generated by the stator.

In this embodiment, the permanent magnet motor rotor includes a rotor iron core 1 , a V-shaped magnetic steel slot uniformly arranged on the rotor iron core 1 , and a magnetic steel assembled on the V-shaped magnetic steel slot. The magnetic bridge protrusion 2 is provided on the rotor core 1, and the magnetic bridge protrusion 2 is arranged on the outside of the V-shaped magnetic steel groove near the rotor q-axis 11 to optimize the shape of the magnetic bridge, thereby optimizing the magnetic circuit of the motor and reducing the The iron loss under various working conditions can greatly improve the motor drive efficiency and motor speed, and meet the driving needs of new energy vehicles.

In one embodiment, as shown in FIG. 1 , the V-shaped magnetic steel slot includes a first V-shaped magnetic steel slot 31 and a second V-shaped magnetic steel slot 32 ; the first V-shaped magnetic steel slot 31 reaches the edge of the rotor core 1 . The first distance is greater than the second distance from the second V-shaped magnetic steel slot 32 to the edge of the rotor core 1 .

Specifically, the V-shaped magnetic steel slot includes a first V-shaped magnetic steel slot 31 and a second V-shaped magnetic steel slot 32, and the first distance from the first V-shaped magnetic steel slot 31 to the edge of the rotor core 1 is greater than that of the second V-shaped magnetic steel slot 31. The second distance from the V-shaped magnetic steel slot 32 to the edge of the rotor core 1, and the first V-shaped magnetic steel slot 31 is equipped with a first magnetic steel 41, and the second V-shaped magnetic steel slot 32 is equipped with a second magnetic steel 42 , to form a double-layer V-shaped rotor structure, the double-layer V-shaped rotor structure can effectively reduce the weight of a single magnetic steel, and the multi-layered magnetic steel can stabilize the magnetic field distribution under load conditions, and can effectively enhance the anti-armature reaction ability and Demagnetization resistance.

It should be noted that, due to the limited space for setting the second V-shaped magnetic steel groove 32 , the magnetic bridge protrusion 2 can be disposed outside the first V-shaped magnetic steel groove 31 at a position close to the rotor q-axis 11 .

In this embodiment, the double-layer V-shaped rotor structure is combined with the optimized magnetic bridge to effectively reduce the sinusoidal distortion rate of the magnetic field waveform and the harmonic component of the magnetic field, thereby reducing the iron loss and reducing the sinusoidal distortion of the magnetic field waveform. The rate is to reduce the amplitude of the rotor harmonic magnetic field, thereby reducing the radial electromagnetic force of the motor, thereby greatly weakening the noise of the motor.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the included angle of the first V-shaped magnetic steel groove 31 ranges from 82° to 125°.

Specifically, the range of the included angle of the first V-shaped magnetic steel slot 31, as shown in FIG. 2 , the range of the included angle α is 82°-125°, so as to effectively reduce the sinusoidal distortion rate of the magnetic field waveform, that is, reduce the harmonics of the rotor. The amplitude of the magnetic field reduces the radial electromagnetic force of the motor, thereby greatly weakening the noise of the motor.

In this embodiment, in order to further reduce the noise of the motor, the included angle range of the first V-shaped magnetic steel groove 31 is preferably 90°˜118°, so as to enhance the noise reduction effect of the motor.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the included angle of the second V-shaped magnetic steel groove 32 ranges from 140° to 160°.

Specifically, the range of the included angle of the second V-shaped magnetic steel groove 32, as shown in the figure, the range of the included angle β is 82°-125°, so as to effectively reduce the sinusoidal distortion rate of the magnetic field waveform, that is, reduce the harmonic magnetic field of the rotor Therefore, the radial electromagnetic force of the motor is reduced, and the noise of the motor is greatly weakened.

In this embodiment, in order to further reduce the noise of the motor, the included angle range of the second V-shaped magnetic steel groove 32 is preferably 90°˜118°, so as to enhance the noise reduction effect of the motor.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the magnetic bridge protrusion 2 is an arc-shaped protrusion.

In this embodiment, the magnetic bridge protrusion 2 is designed as an arc-shaped protrusion to optimize the shape of the magnetic bridge, reduce the torque fluctuation of the motor, increase the resistance of the motor to the armature reaction, and reduce the iron loss of the motor under high-speed conditions. Greatly improve motor efficiency.

In addition, by designing the magnetic bridge protrusion 2 as an arc-shaped protrusion, the transition step stress can be effectively reduced, and the stamping life of the die can be ensured at the same time.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the rotor core 1 is provided with a first arc recess 21 extending from one end of the magnetic bridge protrusion 2 and the other end from the magnetic bridge protrusion 2 . The extended second arc recess 22 .

In this embodiment, the optimized shape of the magnetic bridge further includes a first arc concave position 21 extending from one end of the arc-shaped protrusion and a second arc concave position extending from the other end of the magnetic bridge protrusion 2 22, to form the magnetic bridge after the optimized shape by combining with the magnetic bridge protrusion 2, the first circular arc concave position 21, the second circular arc concave position 22 and the vertical short side line 23 tangent to the second circular arc concave position 22, In order to constrain the direction of the magnetic force lines of the magnetic bridge part, the magnetic circuit of the motor is optimized, the torque fluctuation of the motor is reduced, and the radial electromagnetic force can be reduced, thereby greatly weakening the noise of the motor.

Further, the first arc concave position 21 is connected with the rounded corner of the V-shaped magnetic steel groove, and the magnetic bridge protrusion 2 is respectively connected with the first arc concave position 21 and the second arc concave position 22 through an arc transition, which can be Effectively disperse stress while ensuring die stamping life.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the angle between the line connecting the center of the arc-shaped protrusion and the center A of the rotor core and the rotor d-axis 12 ranges from 15° to 17°.

In this embodiment, the connection line between the center of the arc-shaped protrusion and the center A of the rotor core (assumed to be point A in the figure) is used as the standard line a of the center of the circle (shown by the dotted line a in the figure) and the d-axis 12 of the rotor. The included angle range θ is between 15°-17° to optimize the magnetic circuit of the motor, which can effectively increase the motor torque, reduce the torque fluctuation, reduce the radial electromagnetic force, weaken the noise of the motor, and optimize the performance of the motor.

Further, the angle range between the connection line between the center of the arc-shaped protrusion and the center A of the rotor core and the rotor d-axis 12 is preferably 16°, so as to better realize the improvement of the motor torque, reduce the torque fluctuation, and reduce the torque fluctuation. Radial electromagnetic force, the technical effect of weakening the noise of the motor.

In one embodiment, as shown in FIGS. 1 and 2 , the diameter of the arc-shaped protrusions ranges from 1/3 to 4/5 of the length of the air gap contour line 5 of the V-shaped magnetic steel groove facing the air gap side.

The air gap contour line 5 specifically refers to a side contour line of the V-shaped magnetic steel slot facing the air gap side, for example, the side of the first V-shaped magnetic steel slot 31 facing the air gap side as shown in FIG. 2 straight line length. The air gap side specifically refers to the part outside the rotor core 1 in the figure, where the opening of the V-shaped magnetic steel slot faces. In this embodiment, the diameter range of the circle corresponding to the arc-shaped protrusion is 1/3-4/5 of the length of the air gap contour line 5 of the V-shaped magnetic steel groove facing the air gap side, so as to optimize the magnetic circuit of the motor, which can effectively increase the Motor torque, reduce motor torque fluctuations, and at the same time reduce radial electromagnetic force, thereby weakening the noise of the motor.

Further, the diameter range of the arc-shaped protrusion is preferably 2/5-4/5 of the length of the V-shaped magnetic steel groove toward the air gap contour line 5, so as to better realize the improvement of motor torque, reduce torque fluctuation, and reduce Radial electromagnetic force, the technical effect of weakening the noise of the motor.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the area of the arc-shaped protrusion occupies 2/3-1/5 of the area of the circle.

In this embodiment, the area of the arc-shaped protrusion occupies 2/3-1/5 of the area of the corresponding circle, so as to optimize the magnetic circuit of the motor, which can effectively increase the motor torque, reduce the motor torque fluctuation, and reduce the diameter of the motor. to the electromagnetic force, thereby reducing the noise of the motor. The area of the circle corresponding to the arc-shaped protrusion is πr ² , and r is the radius of the circle corresponding to the arc-shaped protrusion, that is, 1/2 of the diameter of the circle corresponding to the arc-shaped protrusion.

Further, the area of the arc-shaped protrusion is preferably 1/2-1/5 of the corresponding circle area, so as to better increase the motor torque, reduce the motor torque fluctuation, reduce the radial electromagnetic force, and weaken the Technical effect of motor noise.

In this embodiment, by optimizing the shape of the magnetic bridge and the V-shaped magnetic steel groove, a plurality of parameter factors of the magnetic bridge protrusion 2 and the V-shaped magnetic steel groove are optimized, that is, the area of the magnetic bridge protrusion 2, its corresponding circle The diameter, the center of the circle and the included angle of the V-shaped magnetic steel slot greatly improve the NVH performance, motor power and motor speed of the motor, and can effectively solve the problem that the optimization parameters in the existing rotor topology are relatively single, and it is difficult to finely optimize the magnetic field according to the design requirements. road design issues.

The utility model provides a permanent magnet motor, which comprises a permanent magnet motor stator and the above permanent magnet motor rotor.

In this embodiment, the permanent magnet motor includes a permanent magnet motor stator and the above-mentioned permanent magnet motor rotor sleeved on the permanent magnet motor stator. The iron loss and torque fluctuation of the permanent magnet motor under various working conditions are The noise of the motor can be effectively reduced, and the performance of the motor can be improved, so as to meet the trend of high-speed drive motors of new energy vehicles.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions recorded in each embodiment are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the various embodiments of the present invention, and are It should be included within the protection scope of the present invention.

Claims (10)

1. a permanent magnet motor rotor, is characterized in that, comprises: rotor iron core, the V-shaped magnetic steel groove that is evenly arranged on the described rotor iron core and the magnetic steel that is assembled on the described V-shaped magnetic steel groove; The rotor iron core is provided with a magnetic bridge protrusion, and the magnetic bridge protrusion is arranged on the outside of the V-shaped magnetic steel groove at a position close to the q-axis of the rotor. 2. The permanent magnet motor rotor according to claim 1, wherein the V-shaped magnetic steel slot comprises a first V-shaped magnetic steel slot and a second V-shaped magnetic steel slot; the first V-shaped magnetic steel slot The first distance from the slot to the edge of the rotor core is greater than the second distance from the second V-shaped magnetic steel slot to the edge of the rotor core. 3 . The permanent magnet motor rotor according to claim 2 , wherein the included angle of the first V-shaped magnetic steel slot ranges from 82° to 125°. 4 . 4 . The permanent magnet motor rotor according to claim 2 , wherein the included angle of the second V-shaped magnetic steel groove ranges from 140° to 160°. 5 . 5 . The permanent magnet motor rotor according to claim 1 , wherein the magnetic bridge protrusions are arc-shaped protrusions. 6 . 6 . The permanent magnet motor rotor according to claim 5 , wherein the rotor iron core is provided with a first arc recess extending from one end of the magnetic bridge protrusion and a first arc recess extending from the magnetic bridge protrusion. 7 . The second arc concave position extended from the other end of the protrusion. 7 . The permanent magnet motor rotor according to claim 5 , wherein the angle between the connection line between the center of the arc-shaped protrusion and the center of the rotor iron core and the d-axis of the rotor ranges from 15° to 17°. 8 . °. 8 . The permanent magnet motor rotor according to claim 5 , wherein the diameter range of the arc-shaped protrusion is 1/3 of the length of the air gap contour line of the V-shaped magnetic steel groove facing the air gap side. 9 . -4/5. 9 . The permanent magnet motor rotor according to claim 5 , wherein the area of the arc-shaped protrusion occupies 2/3-1/5 of the area of the circle. 10 . 10. A permanent magnet motor, characterized by comprising a permanent magnet motor stator and the permanent magnet motor rotor according to any one of claims 1-9.

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