New energy automobile active suspension hydraulic pump motor
By adopting uneven air gap design, axial two-stage permanent magnet and reasonable thickness of magnetic bridges in the active suspension hydraulic pump motor of new energy vehicles, the problems of noise, high vibration and low power density are solved, and the problem of Higher performance and lighter vehicle weight.
Patent Information
- Application Number
- CN202411200376.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2024-12-31
AI Technical Summary
The existing active suspension hydraulic pump motors of new energy vehicles have problems such as noise, high vibration, low power density, and large moment of inertia, which fail to effectively reduce the overall weight of the motor and improve performance.
The stator and rotor core are made of stamping and stacked silicon steel sheets, and the inner circle and outer circle auxiliary grooves are set, and the uneven air gap is designed; the rotor core is divided into two sections axially, and the permanent magnet is a two-stage axial type, and the staggered opening is Angle design; wire grooves are installed in winding skeleton, the conductor is copper wire or aluminum wire, the thickness of the rotor core magnetic bridge is reasonably designed, and weight reduction holes are added to reduce the moment of inertia.
It reduces the noise and vibration of the motor, improves the power density, reduces the moment of inertia, improves the overall performance, and meets the needs of lightweight in the whole vehicle.
Smart Images
Figure CN119231787A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of new energy automobile parts, and more specifically, relates to a new energy automobile active suspension hydraulic pump motor. Background Art
[0002] Problems and defects of motors in the prior art: The inner circle of the motor stator core and the outer circle of the rotor core adopt a full-circle structure, and the air gap is not designed unevenly, resulting in poor sinusoidal waveform of the motor back electromotive force, large cogging torque and torque pulsation, and large motor noise and vibration. The permanent magnet is axially one-segmented and no pole tilting is performed, resulting in poor sinusoidal waveform of the motor back electromotive force, large cogging torque and torque pulsation, and ultimately large motor noise and vibration; the stator winding frame is not designed with wire slots, and the motor stator cannot be precisely arranged when winding, resulting in wire slots. The full rate is low and the motor power density is low; the thickness of the rotor core magnetic isolation bridge is not designed reasonably, the thickness of the magnetic isolation bridge is designed to be too large, resulting in large magnetic leakage and low motor power density, or the thickness of the magnetic isolation bridge is designed to be too small, the mechanical strength of the rotor core is insufficient, and the magnetic isolation bridge will deform or even break during high-speed operation of the motor, affecting the safe operation of the motor; the rotor core is not designed to reduce weight: the motor rotor is heavy, resulting in a large moment of inertia of the motor, which is not conducive to rapid starting and stopping, and causes the overall weight of the motor to be heavy, which does not meet the final demand of lighter weight of the whole vehicle.
[0003] In the prior art, there is a technology named "An inertia compensation feedforward algorithm for an electric hydraulic pump for active suspension" and the publication number is "CN117922220A". This technology relates to an inertia compensation feedforward algorithm for an electric hydraulic pump for active suspension, including that when the electric hydraulic pump rotates to accelerate or decelerate, the motor needs to continuously change direction to continuously output different torques, and the compensation torque is calculated; when the volumetric efficiency and mechanical efficiency are not considered, the motor torque is the sum of the torque required for the motor output force value and the compensation torque; the motor torque when the angular acceleration is zero and when the angular acceleration exists is calculated respectively. The present invention proposes for the first time that when calculating the motor torque, the compensation torque generated by the system inertia is considered. When the active suspension receives the required target force value, in addition to the torque required for the motor output force value, the motor also needs to be applied with the additional inertia generated by the angular acceleration of the motor inertia, so as to ensure fast and accurate control; the present invention confirms the relationship between the torque output of the ideal motor and the ideal pump output pressure, confirms the relationship between the torque-pressure-angular acceleration bracket, and quickly converts the force value instruction into the motor torque to ensure rapid control.
[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention
[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a new energy vehicle active suspension hydraulic pump motor with a simple structure is provided, which can reduce the noise and vibration of the motor when it is working, increase the power density of the motor, reduce the rotational inertia of the motor, and improve the overall performance.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:
[0007] The present invention discloses a hydraulic pump motor for an active suspension of a new energy vehicle. The stator comprises a stator core, a winding frame, and interphase insulating paper. The stator core is configured as a structure formed by stamping and stacking silicon steel sheets. A wire groove is arranged on the winding frame. An inner circle auxiliary groove is arranged on the inner circle of the stator core, so that the air gap between the stator and the rotor is unevenly thick. The rotor comprises a rotor core, a permanent magnet, and a permanent magnet baffle. The rotor core is a structure formed by stamping and stacking silicon steel sheets. The rotor core is axially divided into two sections, and the two sections of the rotor core are staggered by an angle θ. The permanent magnet is embedded in the permanent magnet groove of the rotor core. The permanent magnet is axially divided into two sections, and the two sections of the permanent magnet are staggered by an angle θ. The outer circle auxiliary groove is arranged on the outer circle of the rotor core, so that the air gap between the stator and the rotor is unevenly thick.
[0008] The rotor core includes a first rotor core and a second rotor core, and the permanent magnet includes a first permanent magnet and a second permanent magnet.
[0009] The stator also includes a conductor, which is a copper wire or an aluminum wire, and the cross-section of the conductor is circular or rectangular.
[0010] The permanent magnet baffle comprises a first permanent magnet baffle and a second permanent magnet baffle.
[0011] The rotor core comprises a rotor core magnetic isolation bridge.
[0012] The thickness of the rotor core magnetic isolation bridge is between 0.5mm and 2mm.
[0013] A plurality of weight-reducing holes are arranged on the rotor core.
[0014] The staggered angle θ of the two rotor cores is in the range of 0°-30°.
[0015] The two permanent magnets are staggered at an angle θ in the range of 0°-30°.
[0016] A plurality of permanent magnets are arranged at intervals along a circle of each rotor core.
[0017] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:
[0018] The new energy vehicle active suspension hydraulic pump motor described in the present invention comprises a stator comprising a stator core, a conductor, a winding frame, and interphase insulating paper, wherein the stator core is made of stamped and stacked silicon steel sheets of a certain thickness, the conductor can be a copper wire or an aluminum wire according to design requirements, and the cross-sectional shape of the conductor can be circular or rectangular, the winding frame is provided with a wire groove, and the wire groove is provided with multiple turns, which is conducive to precise wire arrangement during winding and achieves a high slot full effect, thereby improving the power density of the motor and reducing the volume of the motor. The design of setting inner circle auxiliary grooves on the inner circle of the stator core makes the air gap between the stator and the rotor uneven, the sinusoidal property of the back electromotive force waveform of the motor is better, the cogging torque and torque pulsation are smaller, and finally the noise and vibration of the motor are smaller when it is working; the rotor includes a rotor core, a permanent magnet, and a permanent magnet baffle. The rotor core is made of stamping and stacking silicon steel sheets of a certain thickness. The rotor core is axially divided into two sections and staggered by a certain angle θ. The permanent magnet is embedded in the permanent magnet slot of the rotor core. Like the rotor core, the permanent magnet is axially divided into two sections and staggered by a certain angle θ. Such a structure makes the sinusoidal property of the back electromotive force waveform of the motor better, the cogging torque and torque pulsation are smaller, and finally the noise and vibration of the motor are smaller when it is working; the design of setting outer circle auxiliary grooves on the outer circle of the rotor core also makes the air gap between the stator and the rotor uneven, the sinusoidal property of the back electromotive force waveform of the motor is better, the cogging torque and torque pulsation are smaller, and finally the noise and vibration of the motor are smaller. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The following is a brief description of the contents and symbols in the drawings of this specification: Figure 1 This is a schematic diagram of the structure of the hydraulic pump motor of the new energy vehicle active suspension according to the present invention; Figure 2 This is a schematic diagram of the structure of the hydraulic pump motor of the active suspension of a new energy vehicle according to the present invention; Figure 3 This is a schematic diagram of the structure of the hydraulic pump motor of the new energy vehicle active suspension according to the present invention; Figure 4 It is a structural schematic diagram of the winding frame of the hydraulic pump motor of the active suspension of the new energy vehicle according to the present invention; Figure 5 This is a schematic diagram of the exploded structure of the hydraulic pump motor of the active suspension of a new energy vehicle according to the present invention; The marks in the accompanying drawings are respectively: 1, stator; 2, rotor; 3, conductor; 4, winding frame; 5, stator core; 6, permanent magnet; 7, interphase insulating paper; 8, rotor core; 9, weight reduction hole; 10, air gap; 11, inner circle auxiliary groove; 12, outer circle auxiliary groove; 14, rotor core magnetic isolation bridge; 16, permanent magnet groove; 17, wire groove; 18, permanent magnet baffle; 19, first rotor core; 20, second rotor core; 21, first permanent magnet; 22, second permanent magnet; 23, first permanent magnet baffle; 24, second permanent magnet baffle. DETAILED DESCRIPTION
[0025] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:
[0026] As attached Figure 1 -Attached Figure 5As shown, the present invention is a new energy vehicle active suspension hydraulic pump motor, the stator 1 includes a stator core 5, a winding frame 4, and an interphase insulating paper 7, the stator core 5 is set to a structure made of stamped and stacked silicon steel sheets, the winding frame 4 is provided with a wire groove 17, and the inner circle of the stator core 5 is provided with an inner circle auxiliary groove 11, so that the air gap 10 between the stator 1 and the rotor 2 is uneven in thickness; the rotor 2 includes a rotor core 8, a permanent magnet 6, and a permanent magnet baffle 18, the rotor core 8 is a structure made of stamped and stacked silicon steel sheets, the rotor core 8 is axially divided into two sections, and the two sections of the rotor core 8 are staggered by an angle θ, the permanent magnet 6 is embedded in the permanent magnet slot 16 of the rotor core 8, the permanent magnet 6 is axially divided into two sections, and the two sections of the permanent magnet 6 are staggered by an angle θ, and the outer circle of the rotor core 8 is provided with an outer circle auxiliary groove 12, so that the air gap 10 between the stator 1 and the rotor 2 is uneven in thickness. The above structure proposes an improved technical solution to address the deficiencies in the prior art. When the structure is set, a motor stator (stator 1) and a motor rotor (rotor 2) are made separately. The stator 1 includes a stator core 5, a conductor 3, a winding frame 4, and an interphase insulating paper 7. The stator core is made of stamped and stacked silicon steel sheets of a certain thickness. The conductor 3 can be a copper wire or an aluminum wire according to design requirements. The cross-sectional shape of the conductor 3 can be circular or rectangular. The winding frame 4 is provided with a wire slot 17, and the wire slot 17 is provided with multiple turns, which is conducive to precise wiring arrangement during winding and achieves a high slot full effect, thereby improving the power density of the motor and reducing the volume of the motor. The design of providing an inner circle auxiliary groove 11 on the inner circle of the stator core 5 makes the air gap 10 between the stator 1 and the rotor 2 uneven in thickness, the sinusoidal property of the back electromotive force waveform of the motor is better, the cogging torque and the torque pulsation are smaller, and finally the noise and vibration of the motor during operation are smaller; the rotor 2 includes a rotor core 8, a permanent magnet 6, and a permanent magnet baffle 18. The rotor core 8 is made of a certain thickness of silicon steel sheets by stamping and stacking. The rotor core 8 is axially divided into two sections and staggered by a certain angle θ. The permanent magnet 6 is embedded in the permanent magnet baffle 18 of the rotor core 8. In the body slot 16, like the rotor core 8, the permanent magnet 6 is axially divided into two sections and staggered at a certain angle θ. Such a structure makes the motor back electromotive force waveform sinusoidal, the cogging torque and torque pulsation small, and the noise and vibration of the motor are small when it is working; the design of the outer circle auxiliary slot 12 provided on the outer circle of the rotor core 8 also makes the air gap 10 between the stator 1 and the rotor 2 uneven, the motor back electromotive force waveform sinusoidal, the cogging torque and torque pulsation small, and finally leads to small motor noise and vibration. The new energy vehicle active suspension hydraulic pump motor described in the present invention can reduce the noise and vibration of the motor when it is working, improve the power density of the motor, reduce the rotational inertia of the motor, and improve the overall performance.
[0027] The rotor core 8 includes a first rotor core 19 and a second rotor core 20, and the permanent magnet 6 includes a first permanent magnet 21 and a second permanent magnet 22. In the above structure, the rotor core 8 is axially divided into two sections, that is, the rotor core 8 includes the first rotor core 19 and the second rotor core 20, and the permanent magnet 6 is axially divided into two sections, that is, the permanent magnet 6 includes the first permanent magnet 21 and the second permanent magnet 22. The permanent magnet slot 16 of each section of the rotor core is respectively embedded with a permanent magnet 6.
[0028] The stator 1 further comprises a conductor 3, which is a copper wire or an aluminum wire, and has a circular or rectangular cross-sectional shape. In the above structure, the winding frame 4 is an I-shaped structure, the convex parts at both ends of the winding frame 4 are used to restrict the conductor 3, and the concave part in the middle of the winding frame 4 is provided with a wire groove 17 for arranging the wire. The structure of the wire groove 17 is conducive to precise wire arrangement during winding, achieving a high slot fullness effect, improving the power density of the motor, and reducing the volume of the motor.
[0029] The permanent magnet baffle 18 comprises a first permanent magnet baffle 23 and a second permanent magnet baffle 24. In the above structure, the two permanent magnet baffles play the role of shielding and sealing from both sides.
[0030] The rotor core 8 includes a rotor core magnetic isolation bridge 14. The thickness of the rotor core magnetic isolation bridge 14 is between 0.5 mm and 2 mm. In the above structure, the thickness of the rotor core magnetic isolation bridge 14 is reasonably designed. On the basis of ensuring sufficient mechanical strength of the rotor core, the thickness of the rotor core magnetic isolation bridge is minimized, thereby reducing magnetic leakage and improving the power density of the motor.
[0031] The rotor core 8 is provided with a plurality of weight-reducing holes 9. In the above structure, the rotor core 8 is provided with weight-reducing holes 9, which can reduce the weight of the motor rotor as much as possible without affecting the magnetic circuit, reduce the motor's rotational inertia, facilitate quick start and stop, and meet the final demand of lighter vehicle weight.
[0032] The staggered angle θ between the two sections of the rotor core 8 is in the range of 0°-30°.
[0033] The two permanent magnets 6 are staggered at an angle θ in the range of 0°-30°.
[0034] A plurality of permanent magnets 7 are arranged at intervals along a circle of each section of the rotor core 8 .
[0035] The new energy vehicle active suspension hydraulic pump motor described in the present invention is structured to separately manufacture a motor stator (stator 1) and a motor rotor (rotor 2), wherein the stator 1 comprises a stator core 5, a conductor 3, a winding frame 4, and interphase insulating paper 7, wherein the stator core is made by stamping and stacking silicon steel sheets of a certain thickness, the conductor 3 can be a copper wire or an aluminum wire according to design requirements, the cross-sectional shape of the conductor 3 can be circular or rectangular, the winding frame 4 is provided with a wire slot 17, and the wire slot 17 is provided with multiple turns, which is conducive to precise wire arrangement during the winding process and achieves a high slot full effect, thereby improving the power density of the motor and reducing the volume of the motor. The design of setting an inner circle auxiliary groove 11 on the inner circle of the stator core 5 makes the air gap 10 between the stator 1 and the rotor 2 uneven in thickness, the sinusoidal waveform of the back electromotive force of the motor is better, the cogging torque and torque pulsation are smaller, and finally the noise and vibration of the motor are smaller when it is working; the rotor 2 includes a rotor core 8, a permanent magnet 6, and a permanent magnet baffle 18. The rotor core 8 is made of a certain thickness of silicon steel sheets stamped and stacked. The rotor core 8 is axially divided into two sections and staggered at a certain angle θ. The permanent magnet 6 is embedded in the permanent magnet slot 16 of the rotor core 8. Like the rotor core 8, the permanent magnet 6 is axially divided into two sections and staggered at a certain angle θ. Such a structural design makes the motor back electromotive force waveform more sinusoidal, the cogging torque and torque pulsation are smaller, and the noise and vibration of the motor are smaller during operation; the design of providing the outer circle auxiliary groove 12 on the outer circle of the rotor core 8 also makes the air gap 10 between the stator 1 and the rotor 2 uneven in thickness, the motor back electromotive force waveform is more sinusoidal, the cogging torque and torque pulsation are smaller, and ultimately the motor noise and vibration are smaller, thereby improving performance.
[0036] In summary, the new energy vehicle active suspension hydraulic pump motor described in the present invention has the following beneficial effects: 1. The inner circle of the stator core and the outer circle of the rotor core are respectively designed with auxiliary grooves (including outer circle auxiliary grooves and inner circle auxiliary grooves): the air gap is designed unevenly, so that the sinusoidal property of the motor back electromotive force waveform is better, the cogging torque and torque pulsation are smaller, and the motor noise and vibration are finally reduced; 2. The permanent magnet is designed in an axial two-stage manner, and the two sections of the permanent magnet are staggered at an angle, which is a skewed pole design: the sinusoidal property of the motor back electromotive force waveform is better, the cogging torque and torque pulsation are smaller, and the motor noise and vibration are finally reduced. The motor noise and vibration; 3. The winding frame 4 of the stator 1 is designed with 17 wire slots, and the wire can be precisely arranged during winding, so that the wire slot full rate is high and the motor power density is improved; 4. The thickness of the magnetic isolation bridge of the rotor core is reasonably designed. On the basis of ensuring sufficient mechanical strength of the rotor core, the thickness of the magnetic isolation bridge is minimized, the magnetic leakage is small, and the motor power density is improved; 5. The rotor core is reasonably designed with weight-reducing holes. Without affecting the magnetic circuit, the weight of the motor rotor is minimized, the motor rotation inertia is reduced, which is conducive to rapid start and stop, and meets the final demand of lighter vehicle weight. In this way, the overall performance is improved.
[0037] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.
Claims
1. A hydraulic pump motor for active suspension of new energy vehicles, characterized in that: The stator (1) comprises a stator core (5), a winding frame (4), and interphase insulating paper (7); the stator core (5) is configured as a structure made of stamped and stacked silicon steel sheets; a wire slot (17) is provided on the winding frame (4); an inner circle auxiliary slot (11) is provided on the inner circle of the stator core (5), so that the air gap (10) between the stator (1) and the rotor (2) is unevenly thick; the rotor (2) comprises a rotor core (8), a permanent magnet (6), a permanent magnet baffle (18), and a rotor core (9). The core (8) is a structure made of stamped and stacked silicon steel sheets. The rotor core (8) is axially divided into two sections, and the two sections of the rotor core (8) are staggered by an angle (θ). The permanent magnet (6) is embedded in the permanent magnet slot (16) of the rotor core (8). The permanent magnet (6) is axially divided into two sections, and the two sections of the permanent magnet (6) are staggered by an angle (θ). The outer circle of the rotor core (8) is provided with an outer circle auxiliary slot (12), so that the air gap (10) between the stator (1) and the rotor (2) is unevenly thick.
2. The new energy vehicle active suspension hydraulic pump motor according to claim 1 is characterized in that: The rotor core (8) comprises a first rotor core (19) and a second rotor core (20), and the permanent magnet (6) comprises a first permanent magnet (21) and a second permanent magnet (22).
3. The new energy vehicle active suspension hydraulic pump motor according to claim 1 or 2, characterized in that: The stator (1) further comprises a conductor (3), the conductor (3) is a copper wire or an aluminum wire, and the cross-sectional shape of the conductor (3) is circular or rectangular.
4. The new energy vehicle active suspension hydraulic pump motor according to claim 1 or 2, characterized in that: The permanent magnet baffle (18) comprises a first permanent magnet baffle (23) and a second permanent magnet baffle (24).
5. The new energy vehicle active suspension hydraulic pump motor according to claim 1 or 2, characterized in that: The rotor core (8) comprises a rotor core magnetic isolation bridge (14).
6. The new energy vehicle active suspension hydraulic pump motor according to claim 5, characterized in that: The thickness of the rotor core magnetic isolation bridge (14) is between 0.5 mm and 2 mm.
7. The new energy vehicle active suspension hydraulic pump motor according to claim 1 or 2, characterized in that: A plurality of weight-reducing holes (9) are arranged on the rotor core (8).
8. The new energy vehicle active suspension hydraulic pump motor according to claim 2, characterized in that: The staggered angle (θ) between the two sections of the rotor core (8) is in the range of 0°-30°.
9. The new energy vehicle active suspension hydraulic pump motor according to claim 2, characterized in that: The two permanent magnets (6) are staggered at an angle (θ) in the range of 0°-30°.
10. The new energy vehicle active suspension hydraulic pump motor according to claim 2, characterized in that: A plurality of permanent magnets (6) are arranged at intervals along a circle of each section of the rotor core (8).