CN117424372A - New energy automobile electric driving system and method based on magnetic field modulation effect - Google Patents

New energy automobile electric driving system and method based on magnetic field modulation effect Download PDF

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Publication number
CN117424372A
CN117424372A CN202311239495.9A CN202311239495A CN117424372A CN 117424372 A CN117424372 A CN 117424372A CN 202311239495 A CN202311239495 A CN 202311239495A CN 117424372 A CN117424372 A CN 117424372A
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CN
China
Prior art keywords
stator
inner rotor
modulation
assembly
magnetic field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311239495.9A
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Chinese (zh)
Inventor
匡鹏
舒旭
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Zhixin Technology Co Ltd
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Zhixin Technology Co Ltd
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Publication date
Application filed by Zhixin Technology Co Ltd filed Critical Zhixin Technology Co Ltd
Priority to CN202311239495.9A priority Critical patent/CN117424372A/en
Publication of CN117424372A publication Critical patent/CN117424372A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a new energy automobile electric drive system based on a magnetic field modulation effect, wherein two ends of a hollow shaft of an inner rotor assembly of the new energy automobile electric drive system are respectively assembled on a drive system shell and a differential shell through bearings, one end of a modulation ring is assembled on the hollow shaft of the inner rotor assembly through bearings, the other end of the modulation ring is rigidly assembled on the differential shell, a stator assembly is fixedly arranged in the drive system shell, a bevel gear assembly of the differential is used as an output end of the differential to be connected with an external load shaft, the stator assembly, the modulation ring, the inner rotor assembly and the differential output end of the differential are coaxially arranged, the modulation ring is positioned between the stator assembly and the inner rotor assembly, a gap is reserved between the stator assembly and the modulation ring, and a gap is reserved between the modulation ring and the inner rotor assembly. The invention can replace the mechanical gear transmission of the traditional electric drive system, and solves the problem that the gear transmission can not be eliminated.

Description

New energy automobile electric driving system and method based on magnetic field modulation effect
Technical Field
The invention relates to the technical field of automobile driving, in particular to a new energy automobile electric driving system and method based on a magnetic field modulation effect.
Background
The power assembly of the new energy automobile consists of a motor, an electric control and a speed reducer, is commonly called an electric drive system and is the heart of the electric automobile. In recent years, the evolution of single products into three-in-one integration is completed by an electric driving system, and initially, the electric driving system of an automobile basically takes split parts as main parts, occupies a large amount of space and has high cost; the development of integrated electric drives then began, ranging from "two-in-one" for motors and reducers to "three-in-one" for motors, reducers and motor controllers.
The high integration of the electric drive system is a trend, and the energy consumption and the cost are required to be reduced, so that the power density is required to be higher, the noise is reduced, and the cost is reduced. The three-in-one structure of the motor, the speed reducer and the motor controller in the existing electric drive system is integrated in any way, the motor rotor shaft and the speed reducer shaft are connected in series in a segmented mode, and two-stage mechanical gears are needed for carrying out torque and rotation speed scaling transmission, so that the defects of large occupied space, heavy weight, complex structure, high vibration noise and the like exist.
Disclosure of Invention
The invention aims to provide a new energy automobile electric drive system and a method based on a magnetic field modulation effect, which can replace mechanical gear transmission of a traditional electric drive system, solve the problem that the gear transmission cannot eliminate, such as vibration noise, complex structure, easy generation of mechanical fatigue failure and the like, and enable the whole electric drive system to be simpler and more compact.
In order to achieve the purpose, the novel energy automobile electric driving system based on the magnetic field modulation effect is characterized in that: the novel differential mechanism comprises an inner rotor assembly, a modulation ring, a stator assembly and a differential mechanism, wherein two ends of a hollow shaft of the inner rotor assembly are respectively assembled on a driving system shell and the differential mechanism shell through bearings, one end of the modulation ring is assembled on the hollow shaft of the inner rotor assembly through bearings, the other end of the modulation ring is rigidly assembled on the differential mechanism shell, the stator assembly is fixedly arranged in the driving system shell, a bevel gear assembly of the differential mechanism is used as an output end of the differential mechanism to be connected with an external load shaft, the stator assembly, the modulation ring, the inner rotor assembly and the differential mechanism are coaxially arranged, the modulation ring is positioned between the stator assembly and the inner rotor assembly, a gap is reserved between the stator assembly and the modulation ring, and a gap is reserved between the modulation ring and the inner rotor assembly.
The invention has the beneficial effects that:
1. the invention is used for directly driving a new energy automobile, cancels the contact type transmission torque of a mechanical gear, has simple and compact structure, has no gear engagement noise, and has the advantages of low friction loss, low noise and weak vibration;
2. the invention works based on the magnetic field modulation principle, adopts electromagnetic transmission torque, eliminates the mechanical gear, avoids the problem of mechanical endurance fatigue, and has the advantages of high torque density and high reliability;
3. the differential mechanism, the motor stator assembly, the rotor assembly and the magnetic field modulation ring are coaxially arranged in the shell, and the integrated design has the advantages of compact structure, light weight and high power density, and improves the carrying feasibility of an electric drive system.
4. The new energy automobile electric drive system based on the magnetic field modulation effect solves the problem of continuous mechanical vibration noise complaints, avoids mechanical fatigue failure, and provides a set of brand new ideal architecture mode for the new energy automobile electric drive system.
Drawings
FIG. 1 is an original schematic diagram of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a cross-sectional view of a modulation ring of the present invention;
the drive system comprises a 10-drive system shell, a 20-stator assembly, a 21-stator core, a 22-stator winding coil, a 23-stator permanent magnet pole, a 24-tooth socket, a 30-modulation ring, a 31-cup-shaped connecting bridge, a 32-modulation block, a 40-inner rotor assembly, a 41-hollow shaft, a 42-rotor core, a 43-rotor permanent magnet pole, a 50-differential, a 51-differential shell, a 52-bevel gear assembly, a 60-motor controller, a 70-external load left half shaft and a 71-external load right half shaft.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
the new energy automobile electric drive system based on the magnetic field modulation effect as shown in fig. 1 to 3 comprises an inner rotor assembly 40, a modulation ring 30, a stator assembly 20 and a differential mechanism 50, wherein two ends of a hollow shaft 41 of the inner rotor assembly 40 are respectively assembled on a drive system shell 10 and a differential mechanism shell 51 through bearings (the hollow shaft 41 can rotate on the drive system shell 10 and the differential mechanism shell 51), one end of the modulation ring 30 is assembled on the hollow shaft 41 of the inner rotor assembly 40 through bearings (one end of the modulation ring 30 can rotate on the hollow shaft 41), the other end of the modulation ring 30 is rigidly assembled on the differential mechanism shell 51, the stator assembly 20 is fixedly arranged in the drive system shell 10, a bevel gear assembly 52 of the differential mechanism 50 is used as a differential mechanism output end to be connected with an external load shaft, the external load shaft comprises an external load left half shaft 70 and an external load right half shaft 71, the load left half shaft 70 penetrates out of an inner ring of the hollow shaft 41 and has a gap with the inner ring of the hollow shaft 41, the stator assembly 20, the modulation ring 30, the inner rotor assembly 40 and the differential mechanism output end of the differential mechanism is coaxially arranged with the differential mechanism output end of the differential mechanism 50, the modulation ring 30 is positioned between the stator assembly 20 and the inner rotor assembly 40, the modulation ring 30 and the modulation ring 30 has a gap between the modulation ring 30 and the modulation ring 40.
In the above-mentioned technical solution, the inner rotor assembly 40 includes a hollow shaft 41, a rotor core 42 fixed on the hollow shaft 41, and a plurality of pairs of rotor permanent magnet poles 43 fixed on the outer periphery of the rotor core 42 by surface mounting.
In the above technical solution, the modulation ring 30 includes a cup-shaped connection bridge 31 and a modulation block 32, the outer circumferential surface of the cup-shaped connection bridge 31 is provided with a plurality of trapezoid grooves, the cup bottom of the cup-shaped connection bridge 31 is assembled on the rotor hollow shaft 41 through a bearing (the cup bottom of the cup-shaped connection bridge 31 can rotate on the rotor hollow shaft 41), and the cup mouth end surface of the cup-shaped connection bridge 31 is rigidly connected with the differential housing 51;
the modulation block 32 is formed by superposing a plurality of silicon steel sheets with trapezoid structures, and the wider part of the modulation block 32 is embedded into the corresponding trapezoid groove.
In the above technical solution, the stator assembly 20 includes a stator core 21, a plurality of stator winding coils 22 and a plurality of pairs of stator permanent magnet poles 23, the inner surface of the stator core 21 is provided with a plurality of tooth slots 24, each stator winding coil 22 is embedded in a corresponding tooth slot 24, the stator permanent magnet poles 23 are embedded in a corresponding tooth slot 24 opening, the stator core 21 is formed by stacking silicon steel sheets, and a plurality of tooth slots 24 are punched on the inner surface of the annular silicon steel sheet.
In the above technical solution, the pole pairs of the stator permanent magnet pole 23, the rotor permanent magnet pole 43 and the modulation ring 30 are p 1 、p 3 And p 2 The following formula is satisfied:
P 2 ＝P 1 +P 3
in the permanent magnet motor structure comprising the inner rotor assembly 40 and the stator assembly 20, when the current with the frequency of H is introduced to the stator winding coil 22, the electromagnetic torque generated by the stator winding coil 22 drives the inner rotor assembly 40 with the same pole pair number as the stator winding coil 22 to rotate, and the angular velocity omega of the inner rotor assembly 40 3 The method comprises the following steps:
rotated P 3 P generated for rotor permanent magnet pole 43 i Subharmonic dominant magnetic field passing through P 2 Adjustment of the modulation ring 30 generates an-p in the air gap 2 -p i -subharmonic dominated magnetic field, p i ＝p 3 Harmonic components of the magnetic field and the stator permanent magnets P 1 The harmonic components generated by the magnetic field to the stator permanent magnet poles 23 are matched so that the interactions transmit torque.
In the above technical solution, to ensure maximum transmission torque, the relationship between the pole pair numbers of the stator permanent magnet pole 23, the rotor permanent magnet pole 43 and the modulation ring 30 and the angular velocity satisfies the following formula:
wherein omega is 1 、ω 2 Omega, omega 3 Respectively representing stator permanent magnet pole 23, modulation ring 30 andangular velocity of rotor permanent magnet poles 43;
the stator permanent magnet poles 23 are stationary, and the modulation ring 30 and the rotor permanent magnet poles 43 satisfy the following relationship:
the inner rotor assembly 40 is loaded by the stator winding coil 22 and also receives the magnetic field modulation load from the modulation ring 30, and the two loads are equal and opposite in direction, so that stable idling of the inner rotor assembly 40 is realized, namely the stator winding coil 22 generates torque T for driving the inner rotor assembly 40 3 Torque T with modulation ring 30 2 The following relationship is satisfied:
based on the above formula, there is a reduction ratio P between the modulation ring 30 as the output and the input 2 /P 3 Therefore, the mechanical speed reduction ratio is replaced by the traditional mechanical speed reduction ratio, the structure is simplified, no gear engagement noise and mechanical contact are generated, and the mechanical speed reduction ratio has the advantages of low friction loss, low noise, weak vibration, high torque density and high reliability.
In the driving method based on the system, when the motor controller 60 is used as an electric driving system, three-phase current is input to the stator winding coil 22, electromagnetic torque generated by the motor controller drives the inner rotor assembly 40 to rotate, the rotor permanent magnet magnetic poles 43 of the inner rotor assembly 40 form a magnetic field modulation effect with the modulation ring 30 and the stator permanent magnet magnetic poles 23, rotation (high speed and low torque) on the inner rotor assembly 40 is transmitted to the modulation ring 30 and the differential 50 in a decelerating way, and the bevel gear assembly 52 of the differential 50 drives a load to rotate, so that low speed and high torque output is realized. The differential 50, the motor stator assembly 20, the rotor assembly 40 and the magnetic field modulation ring 30 are coaxially arranged in the shell 10, and the integrated design has the advantages of compact structure, light weight and high power density, and improves the feasibility of carrying an electric drive system.
When the motor is used as a braking energy recovery system, a load drives the differential mechanism 50 and the modulation ring 30 to rotate (input low speed and high torque), the speed is increased by the magnetic field modulation effect and is transmitted to the inner rotor assembly 40, and finally three-phase current is induced in the stator winding coils 22 of the stator assembly 20, so that electric energy is recovered.
What is not described in detail in this specification is prior art known to those skilled in the art.

Claims (10)

1. The utility model provides a new energy automobile electric drive system based on magnetic field modulation effect which characterized in that: the novel transmission mechanism comprises an inner rotor assembly (40), a modulation ring (30), a stator assembly (20) and a differential mechanism (50), wherein two ends of a hollow shaft (41) of the inner rotor assembly (40) are assembled on a driving system shell (10) and a differential mechanism shell (51) through bearings respectively, one end of the modulation ring (30) is assembled on the hollow shaft (41) of the inner rotor assembly (40) through bearings, the other end of the modulation ring (30) is rigidly assembled on the differential mechanism shell (51), a stator assembly (20) is fixedly arranged in the driving system shell (10), a bevel gear assembly (52) of the differential mechanism (50) is used as a differential mechanism output end to be connected with an external load shaft, the stator assembly (20), the modulation ring (30), the inner rotor assembly (40) and the differential mechanism output end of the differential mechanism (50) are coaxially arranged, the modulation ring (30) is positioned between the stator assembly (20) and the inner rotor assembly (40), a gap is reserved between the stator assembly (20) and the modulation ring (30), and the inner rotor assembly (40) is reserved.
2. The magnetic field modulation effect based new energy automobile electric drive system of claim 1, wherein: the inner rotor assembly (40) comprises a hollow shaft (41), a rotor core (42) fixed on the hollow shaft (41) and a plurality of pairs of rotor permanent magnet poles (43) fixed on the periphery of the rotor core (42) in a surface-mounted mode.
3. The magnetic field modulation effect based new energy automobile electric drive system of claim 2, wherein: the modulation ring (30) comprises a cup-shaped connecting bridge (31) and a modulation block (32), wherein a plurality of trapezoid grooves are uniformly formed in the outer circle surface of the cup-shaped connecting bridge (31), the cup bottom of the cup-shaped connecting bridge (31) is assembled on a rotor hollow shaft (41) through a bearing, and the end face of the cup opening of the cup-shaped connecting bridge (31) is rigidly connected with a differential shell (51);
the modulation blocks (32) are embedded in the corresponding trapezoidal grooves.
4. The magnetic field modulation effect based new energy automobile electric drive system according to claim 3, wherein: the stator assembly (20) comprises a stator core (21), a plurality of stator winding coils (22) and a plurality of pairs of stator permanent magnet poles (23), a plurality of tooth grooves (24) are formed in the inner surface of the stator core (21), each stator winding coil (22) is embedded in a corresponding tooth groove (24), and the stator permanent magnet poles (23) are embedded in corresponding tooth groove (24) openings.
5. The magnetic field modulation effect based new energy automobile electric drive system of claim 4, wherein: the pole pairs of the stator permanent magnet pole (23), the rotor permanent magnet pole (43) and the modulation ring (30) are respectively P 1 、P 3 And P 2 The following formula is satisfied:
P 2 ＝P 1 +P 3 。
6. the magnetic field modulation effect based new energy automobile electric drive system of claim 5, wherein: in a permanent magnet motor structure formed by an inner rotor assembly (40) and a stator assembly (20), when a current with the frequency of H is introduced to a stator winding coil (22), electromagnetic torque generated by the stator winding coil (22) drives the inner rotor assembly (40) with the same pole pair number as the stator winding coil (22) to rotate, and the angular speed omega of the inner rotor assembly (40) 3 The method comprises the following steps:
rotated P 3 P generated for rotor permanent magnet pole (43) i Subharmonic dominant magnetic field passing through P 2 Adjustment of the modulation ring (30) generates an-p in the air gap 2 -p i -subharmonic dominated magnetic field, p i ＝p 3 Harmonic components of the magnetic field and the stator permanent magnets P 1 Harmonic components generated by magnetic fields of the stator permanent magnet poles (23) are matched so that the interaction transmits torque.
7. The magnetic field modulation effect based new energy automobile electric drive system of claim 6, wherein: the relationship between the pole pair numbers of the stator permanent magnet pole (23), the rotor permanent magnet pole (43) and the modulation ring (30) and the angular velocity satisfies the following formula:
wherein omega is 1 、ω 2 Omega, omega 3 Angular velocities of the stator permanent magnet pole (23), the modulation ring (30) and the rotor permanent magnet pole (43) are respectively represented;
the stator permanent magnet pole (23) is stationary, the modulation ring (30) and the rotor permanent magnet pole (43) satisfy the following relationship:
8. the magnetic field modulation effect based new energy automobile electric drive system of claim 7, wherein: the inner rotor assembly (40) is loaded by the stator winding coil (22) and also receives magnetic field modulation load from the modulation ring (30), and the two loads are equal and opposite in size, so that stable idling of the inner rotor assembly (40) is realized, namely the stator winding coil (22) generates torque T3 for driving the inner rotor assembly (40) and torque T of the modulation ring (30) 2 The following relationship is satisfied:
based on the above formula, a modulation loop (30) is used as an output terminalWith an input end having a reduction ratio P 2 /P 3 。
9. A driving method based on the system of claim 4, characterized in that: when the motor controller (60) is used as an electric drive system, three-phase current is input to the stator winding coil (22), electromagnetic torque generated by the motor controller drives the inner rotor assembly (40) to rotate, the rotor permanent magnet magnetic poles (43) of the inner rotor assembly (40) form a magnetic field modulation effect with the modulation ring (30) and the stator permanent magnet magnetic poles (23), rotation on the inner rotor assembly (40) is reduced and transmitted to the modulation ring (30) and the differential mechanism (50), and the bevel gear assembly (52) of the differential mechanism (50) drives a load to rotate.
10. The driving method according to claim 9, characterized in that: when the motor is used as a braking energy recovery system, a load drives the differential mechanism (50) and the modulation ring (30) to rotate, the speed is increased by a magnetic field modulation effect and is transmitted to the inner rotor assembly (40), and finally three-phase current is induced in the stator winding coil (22) of the stator assembly (20) to recover electric energy.
CN202311239495.9A 2023-09-25 2023-09-25 New energy automobile electric driving system and method based on magnetic field modulation effect Pending CN117424372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311239495.9A CN117424372A (en) 2023-09-25 2023-09-25 New energy automobile electric driving system and method based on magnetic field modulation effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311239495.9A CN117424372A (en) 2023-09-25 2023-09-25 New energy automobile electric driving system and method based on magnetic field modulation effect

Publications (1)

Publication Number Publication Date
CN117424372A true CN117424372A (en) 2024-01-19

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ID=89531574

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311239495.9A Pending CN117424372A (en) 2023-09-25 2023-09-25 New energy automobile electric driving system and method based on magnetic field modulation effect

Country Status (1)

Country Link
CN (1) CN117424372A (en)

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