阅读说明：本技术 应用于电动汽车永磁同步电机的双v型电机转子 (double-V-shaped motor rotor applied to permanent magnet synchronous motor of electric automobile ) 是由 李西京 郭建文 于 2019-10-28 设计创作，主要内容包括：本发明公开了一种应用于电动汽车永磁同步电机的双V型电机转子,多个磁极沿着圆周方向设置于转子铁芯内部,每个磁极下设有第一和第二层V型磁钢槽,第一层V型磁钢槽沿圆周方向间隔设于靠近转子铁芯表面,第二层V型磁钢槽沿圆周方向设于第一层V型磁钢槽的两侧,第一和第二层V型磁钢槽均关于磁钢槽中轴线对称,并且槽内分别放置采用树脂粘接的第一层磁钢和第二层磁钢,第一层磁钢的充磁方向大致为径向充磁,第二层磁钢的充磁方向大致为切向充磁。本电机转子克服传统永磁同步电机的缺陷,有效提高转子铁心结构强度,降低转子铁心损耗和磁钢涡流损耗,减少高次谐波对于电机振动、噪声的影响,确保电机高速运行时的高效可靠。(The invention discloses a double-V-shaped motor rotor applied to a permanent magnet synchronous motor of an electric automobile, a plurality of magnetic poles are arranged in a rotor core along the circumferential direction, a first layer of V-shaped magnetic steel grooves and a second layer of V-shaped magnetic steel grooves are arranged below each magnetic pole, the first layer of V-shaped magnetic steel grooves are arranged close to the surface of the rotor core at intervals along the circumferential direction, the second layer of V-shaped magnetic steel grooves are arranged at two sides of the first layer of V-shaped magnetic steel grooves along the circumferential direction, the first layer of V-shaped magnetic steel grooves and the second layer of V-shaped magnetic steel grooves are symmetrical about the central axis of the magnetic steel grooves, a first layer of magnetic steel and a second layer of magnetic steel which are bonded by resin are respectively arranged in the grooves, the magnetizing direction of the first layer of magnetic steel is approximately radial. The motor rotor overcomes the defects of the traditional permanent magnet synchronous motor, effectively improves the structural strength of the rotor core, reduces the loss of the rotor core and the eddy current loss of magnetic steel, reduces the influence of higher harmonics on the vibration and the noise of the motor, and ensures high efficiency and reliability when the motor runs at high speed.)

1. The utility model provides a be applied to electric automobile PMSM's two V type electric motor rotor, includes rotor core, a plurality of magnetic poles along the circumferencial direction set up in inside the rotor core, its characterized in that: first layer V type magnet steel groove and second floor V type magnet steel groove are equipped with under every magnetic pole, first layer V type magnet steel groove is located along the circumferencial direction interval and is close to the rotor core surface, second floor V type magnet steel groove is located along the circumferencial direction the both sides in first layer V type magnet steel groove, first layer V type magnet steel groove is symmetrical about magnet steel groove axis, place first layer magnet steel and adopt the resin bonding in the first layer V type magnet steel groove, second floor V type magnet steel groove is symmetrical about magnet steel groove axis, place second floor magnet steel and adopt the resin bonding in the second floor V type magnet steel groove, the direction of magnetizing of first layer magnet steel is radial magnetization roughly, the direction of magnetizing of second floor magnet steel is the tangential magnetization roughly.

2. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to claim 1, characterized in that: the first layer of magnetic steel and the second layer of magnetic steel are two long and thin rectangular magnetic steels with the same shape, the long and thin rectangular magnetic steels are high-remanence rare earth permanent magnet materials, the thicknesses of the long and thin rectangular magnetic steels of the first layer of magnetic steel and the second layer of magnetic steel are equal, and the width of the long and thin rectangular magnetic steel of the second layer of magnetic steel is larger than that of the long and thin rectangular magnetic steel of the first layer of magnetic steel.

3. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to claim 1, characterized in that: the magnetizing direction of the first layer of magnetic steel and the included angle theta of the axis of the first layer of V-shaped magnetic steel groove₁Is 0 DEG < theta₁Less than 30 degrees, and the magnetizing direction of the second layer of magnetic steel and the included angle theta of the tangent line of the second layer of V-shaped magnetic steel groove₂Is 0 DEG < theta₂The magnetizing directions of the first layer of magnetic steel and the second layer of magnetic steel are towards the outer side or the inner side of the rotor core at the same time, and the N pole and the S pole of the magnetizing directions of the magnetic steels are alternately carried out under adjacent magnetic poles of the rotor core.

4. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to claim 1, characterized in that: the rotor comprises a rotor core and is characterized in that a first layer of V-shaped magnetic steel grooves are formed in the surface of the rotor core, a first magnetism isolating groove is formed in the surface of the rotor core, a gap is reserved between the first layer of magnetic steel and the first magnetism isolating groove, a second layer of V-shaped magnetic steel grooves are formed in the surface of the rotor core, a second magnetism isolating groove is formed in the surface of the second magnetism isolating groove, a gap is reserved between the second layer of magnetic steel and the second magnetism isolating groove, reinforcing ribs are arranged at the connecting ends of the first layer of V-shaped magnetic steel grooves, air grooves are formed in the connecting ends of the second layer of V-shaped magnetic steel grooves, and the air grooves are connected with the groove ends of the second.

5. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to claim 1, characterized in that: the rotor core surface is equipped with two first auxiliary arc wall at the interval in the first layer V type magnet steel groove, the notch width of first auxiliary arc wall is 1.5 ~ 2.5mm, the groove depth is 0.2 ~ 0.8mm, the contained angle b of two first auxiliary arc wall is 0 degree < b < a, wherein, a is the polar arc angle of first layer magnet steel outside angle for the centre of a circle, 12 degree < a < 22.

6. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to claim 1, characterized in that: the rotor core surface is in the second layer V type magnet steel inslot is equipped with two second auxiliary arc wall at an interval, the notch width of second auxiliary arc wall is 2 ~ 4.5mm, the groove depth is 0.5 ~ 1mm, the contained angle d of two second auxiliary arc wall is e < d < c, wherein, c is the polar arc angle of second layer magnet steel outside angle for the centre of a circle, 25 degrees < c < 35 degrees, e is the polar arc angle of first layer magnet steel inside angle for the centre of a circle, 15 degrees < e < 25 degrees.

7. The double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile according to any one of claims 1 to 6, characterized in that: the double-V-shaped motor rotor is arranged on a motor rotating shaft and is positioned in a cavity of the motor stator, an air gap is arranged between the double-V-shaped motor rotor and the motor stator, and the motor stator is provided with an armature winding.

Technical Field

The invention relates to the technical field of motors, in particular to a double-V-shaped motor rotor applied to a permanent magnet synchronous motor of an electric automobile.

Background

The traditional permanent magnet synchronous motor has the advantages of high power factor, high power density, high efficiency and the like, and is widely applied to the new energy electric automobile industry. However, the conventional permanent magnet synchronous motor can cause the problems of rotor temperature rise, punching strength, vibration, noise and the like at high rotating speed. The structure strength of the rotor core has certain defects, the loss of the rotor core and the eddy current loss of the magnetic steel are large, and the influence of higher harmonics on the vibration and the noise of the motor is high. Therefore, the permanent magnet synchronous motor which can still work efficiently and reliably during high-speed running has great practical significance for application and development in the field of new energy vehicles on the premise of ensuring the performance of the motor.

Disclosure of Invention

The invention aims to solve the technical problem of providing a double-V-shaped motor rotor applied to a permanent magnet synchronous motor of an electric automobile, which overcomes the defects of the traditional permanent magnet synchronous motor, effectively improves the structural strength of a rotor core, reduces the loss of the rotor core and the eddy current loss of magnetic steel, reduces the influence of higher harmonics on the vibration and the noise of the motor, and ensures high efficiency and reliability of the motor in high-speed operation.

In order to solve the technical problem, the double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile comprises a rotor core, a plurality of magnetic poles are arranged in the rotor core along the circumferential direction, a first layer of V-shaped magnetic steel grooves and a second layer of V-shaped magnetic steel grooves are arranged below each magnetic pole, the first layer of V-shaped magnetic steel grooves are arranged close to the surface of the rotor core along the circumferential direction at intervals, the second layer of V-shaped magnetic steel grooves are arranged on two sides of the first layer of V-shaped magnetic steel grooves along the circumferential direction, the first layer of V-shaped magnetic steel grooves are symmetrical about the central axis of the magnetic steel grooves, first layer of magnetic steel is arranged in the first layer of V-shaped magnetic steel grooves and is bonded by resin, the second layer of V-shaped magnetic steel grooves are symmetrical about the central axis of the magnetic steel grooves, second layer of magnetic steel is arranged in the second layer of V-shaped magnetic steel grooves and is bonded by resin, the, and the magnetizing direction of the second layer of magnetic steel is approximately tangential.

Further, the first layer of magnetic steel and the second layer of magnetic steel are two long and thin rectangular magnetic steels with the same shape, the long and thin rectangular magnetic steels are made of high-remanence rare earth permanent magnet materials, the thicknesses of the long and thin rectangular magnetic steels of the first layer of magnetic steel and the second layer of magnetic steel are equal, and the width of the long and thin rectangular magnetic steel of the second layer of magnetic steel is larger than that of the long and thin rectangular magnetic steel of the first layer of magnetic steel.

Furthermore, the magnetizing direction of the first layer of magnetic steel and the included angle theta of the axis of the first layer of V-shaped magnetic steel groove₁Is 0 DEG < theta₁Less than 30 degrees, and the magnetizing direction of the second layer of magnetic steel and the included angle theta of the tangent line of the second layer of V-shaped magnetic steel groove₂Is 0 DEG < theta₂The magnetizing directions of the first layer of magnetic steel and the second layer of magnetic steel are towards the outer side or the inner side of the rotor core at the same time, and the N pole and the S pole of the magnetizing directions of the magnetic steels are alternately carried out under adjacent magnetic poles of the rotor core.

Further, the first layer of V-shaped magnetic steel grooves are formed in the surface of the rotor core, a first magnetism isolating groove is formed in the surface of the rotor core, a gap is reserved between the first layer of magnetic steel and the first magnetism isolating groove, the second layer of V-shaped magnetic steel grooves are formed in the surface of the rotor core, a second magnetism isolating groove is formed in the surface of the second layer of magnetic steel and the second magnetism isolating groove, reinforcing ribs are arranged at the connecting ends of the first layer of V-shaped magnetic steel grooves, air grooves are formed at the connecting ends of the second layer of V-shaped magnetic steel grooves, and the air grooves are connected with the groove ends of the second layer of V-shaped magnetic steel grooves through the reinforcing ribs.

Furthermore, the surface of the rotor core is provided with two first auxiliary arc-shaped grooves in the first layer of V-shaped magnetic steel groove at intervals, the width of the notch of each first auxiliary arc-shaped groove is 1.5-2.5 mm, the depth of each groove is 0.2-0.8 mm, the included angle b of the two first auxiliary arc-shaped grooves is more than 0 degree and less than b and less than a, wherein a is the polar arc angle of the outer side angle of the first layer of magnetic steel relative to the circle center, and a is more than 12 degrees and less than 22 degrees.

Furthermore, two second auxiliary arc-shaped grooves are arranged on the surface of the rotor core in the second layer of V-shaped magnetic steel grooves at intervals, the width of a notch of each second auxiliary arc-shaped groove is 2-4.5 mm, the depth of each groove is 0.5-1 mm, the included angle d of the two second auxiliary arc-shaped grooves is that d is greater than e and less than c, wherein c is the angle of the outer side of the second layer of magnetic steel relative to the pole arc of the circle center, c is greater than 25 degrees and less than 35 degrees, e is the angle of the inner side of the first layer of magnetic steel relative to the pole arc of the circle center, and e is greater than 15 degrees and less than 25 degrees.

Further, the double-V-shaped motor rotor is arranged on the motor rotating shaft and is positioned in a cavity of the motor stator, an air gap is arranged between the double-V-shaped motor rotor and the motor stator, and the motor stator is provided with an armature winding.

Because the double-V-shaped motor rotor applied to the permanent magnet synchronous motor of the electric automobile adopts the technical scheme, including rotor core promptly, a plurality of magnetic poles set up inside rotor core along the circumferencial direction, every magnetic pole has first layer V type magnet steel groove and second floor V type magnet steel groove, first layer V type magnet steel groove is located near rotor core surface along the circumferencial direction interval, the both sides in first layer V type magnet steel groove are located to second floor V type magnet steel groove along the circumferencial direction, first layer V type magnet steel groove is symmetrical about magnet steel groove axis, place first layer magnet steel and adopt the resin bonding in the first layer V type magnet steel groove, second floor V type magnet steel groove is symmetrical about magnet steel groove axis, place second floor magnet steel and adopt the resin bonding in the second floor V type magnet steel groove, the direction of magnetizing of first layer magnet steel is radial magnetizing roughly, the direction of magnetizing of second floor magnet steel is roughly tangential magnetizing. The motor rotor overcomes the defects of the traditional permanent magnet synchronous motor, effectively improves the structural strength of the rotor core, reduces the loss of the rotor core and the eddy current loss of magnetic steel, reduces the influence of higher harmonics on the vibration and the noise of the motor, and ensures high efficiency and reliability when the motor runs at high speed.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a schematic view of a double V-shaped motor rotor applied to a permanent magnet synchronous motor of an electric vehicle according to the present invention;

FIG. 2 is a schematic view of an opening angle of magnetic steel in the double-V-shaped motor rotor;

FIG. 3 is a schematic diagram of a position of a first auxiliary arc-shaped groove on the surface of a rotor core in the double-V-shaped motor rotor;

fig. 4 is a schematic diagram of a second auxiliary arc-shaped slot on the surface of the rotor core in the double-V-shaped motor rotor.

Detailed Description