A demagnetization type electronically controlled permanent magnet gear and its control method

Abstract

The present invention relates to a demagnetization type electronically controlled permanent magnet gear and its control method, which comprises a high-speed rotor, a magnetic modulation ring, a fixed ring and a machine base. The left end of the input shaft is connected to the prime mover, and the magnetic modulation ring is fixedly connected to the left end of the output shaft. The intermediate transmission part is sequentially distributed with a high-speed rotor, a magnetic modulation ring and a fixed ring from the inside to the outside. The high-speed rotor transmits power to the magnetic modulation ring under the action of magnetic field modulation, and then outputs the power. When a pulsed current is applied, internal demagnetization occurs, and the magnetic yoke surface of the fixed ring loses magnetism, and the power cannot be output. By applying a pulsed current to the coil for a short time, the magnetic field state of the magnetic component is changed, and the power on / off operation of the output shaft of the demagnetization type electronically controlled permanent magnet gear is realized. The present invention can rely on itself to control the power on and off. This device integrates the clutch and the transmission mechanism, can minimize the transmission chain, improve the transmission efficiency, greatly save the use space, and meet the requirements of more transmission equipment with limited space, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic gear transmission, and particularly to a demagnetized electro-permanent magnet gear and a control method thereof. Background Art

[0002] Looking at the current transmission system, the power transmission route determines the efficiency problem, and the power on-off technology is the top priority in power transmission. The current power on-off technology solutions are divided into the following two types: frequently starting and stopping the prime mover, or adding a clutch between the prime mover device and the transmission device to control the power on-off. For the first solution, the frequent starting and stopping operations of the prime mover device will cause unnecessary waste of energy, greatly reduce the efficiency, and even damage the components in the prime mover device and further affect the service life of the device. For the second technical solution, the clutch can well solve the problem of narrow torque output range, but the disadvantages brought are that it increases the length of the power transmission chain, resulting in a long energy transmission time and more energy loss, greatly reducing the transmission efficiency, and the addition of the clutch will make the installation space larger, increasing the space occupancy and other adverse effects.

[0003] Taking the automobiles that are more prevalent in the current market as an example, existing automobiles can generally be classified into two major categories: fuel vehicles and electric vehicles. Fuel vehicles use an internal combustion engine as the power input, which is sequentially connected to automotive transmission structures such as a clutch, a transmission, a differential, and drive wheels. Currently, the transmission system of fuel vehicles is usually the automotive transmission system disclosed in Chinese Patent CN1101036965B. The traditional automotive transmission system module consists of an engine, a clutch, a transmission, a differential, and drive wheels connected in sequence. For the above transmission system solution, the existence of the clutch is to solve the problem of the torque output range of the internal combustion engine. However, the problems brought about are that the installation space of the vehicle will increase accordingly, the power transmission chain will be lengthened, and the energy transmission efficiency will be relatively low. If the clutch is removed, it will cause the engine to start and stop frequently, unable to meet the shifting requirements, and will greatly reduce the service life of the device and the energy utilization rate. Electric vehicles usually use an electric motor as the power input. Chinese Patent CN209634262U discloses a transmission system for an electric vehicle. The output end of the electric motor is connected to a rotating shaft, the rotating shaft is connected to the input end of a gearbox through an oil pressure clutch, the output end of the gearbox is connected to an output shaft, and the drive wheels are driven to rotate through a drive shaft. For electric vehicles with a clutch, the resulting effects are a relatively large volume and low transmission efficiency. Moreover, electric vehicles also have another transmission system. The content disclosed in Chinese Patent CN206856495U is that the drive motor is in transmission connection with a continuously variable transmission, the continuously variable transmission is in transmission connection with a speed reducer, and the speed reducer is connected to the drive wheels. This transmission solution saves the clutch. For electric vehicles without a clutch, they cannot meet the shifting requirements, and have limited applications. They can only be installed on small electric vehicles. Moreover, with the saving of the clutch, the electric motor needs to start and stop frequently to control the on / off of the power, resulting in a significant reduction in the service life of the electric motor, damage to the internal components of the electric motor, and an increase in maintenance costs.

[0004] For large electric motors of large automobiles, it is impossible to achieve the frequent start and stop of small motors. A switch device for controlling the on / off of power needs to be added between the power input part and the transmission device. This will also increase the space occupancy rate and reduce the power transmission efficiency at the same time.

[0005] Therefore, it is of great practical significance to design a transmission device with a simple, compact structure and capable of freely controlling the on / off of power. However, most of the current transmission devices use mechanical gears and cannot achieve automatic control of the on / off of power by their own structures. Extra clutches need to be connected to achieve the purpose, which results in problems such as low transmission efficiency and large space occupation. Summary of the Invention

[0006] The purpose of the present invention is to provide a demagnetization type electronically controlled permanent magnet gear and its control method, which can effectively solve the integration problem of the clutch and the transmission mechanism.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A demagnetizing type electro-controlled permanent magnet gear proposed by the present invention includes a high-speed rotor, a magnetic modulation ring, a fixing ring and a machine base; the magnetic modulation ring is coaxially arranged on the circumferential outer side of the high-speed rotor; the fixing ring is coaxially arranged on the circumferential outer side of the magnetic modulation ring; the fixing ring is fixedly connected with the machine base; the high-speed rotor is connected with the input shaft; the magnetic modulation ring is connected with the output shaft; and it is characterized in that: the high-speed rotor is composed of an annular magnetic conductive core A and Z1 permanent magnets C, the permanent magnets are evenly distributed along the circumference of the annular magnetic conductive core A and the adjacent permanent magnets have opposite magnetic poles; P magnetic modulation blocks are arranged at equal intervals in the circumferential direction of the magnetic modulation ring, and a low magnetic permeability material is filled between adjacent magnetic modulation blocks; a certain gap is arranged between the permanent magnets on the high-speed rotor and the magnetic modulation ring; the fixing ring is composed of an annular magnetic conductive core B and Z2 magnetic components;

[0009] The magnetic component includes a soft magnetic body, two permanent magnets D, a group of coils and a magnetic yoke; a cubic connecting end is arranged on the magnetic yoke; the coils are wound on the soft magnetic body; the soft magnetic body is fixedly connected with a plane C on the connecting end of the magnetic yoke; the permanent magnets D are respectively fixedly connected to two parallel planes D1 and D2 on the connecting end of the magnetic yoke, and the plane C is perpendicular to the planes D1 and D2; the magnetic field directions of the permanent magnets D are all perpendicular to the planes D1 and D2; the magnetic field directions of the two permanent magnets D on the same magnetic yoke are opposite; the magnetic components are evenly distributed along the circumference of the annular magnetic conductive core B and the magnetic poles of the soft magnetic bodies in adjacent magnetic components are opposite; a certain gap is arranged between the magnetic yoke and the magnetic modulation ring.

[0010] Further, the permanent magnets C of the high-speed rotor are evenly arranged on the outer circumferential surface of the annular magnetic conductive core A along the circumferential direction of the annular magnetic conductive core A; the magnetization direction of the permanent magnets C is along the radial direction of the annular magnetic conductive core A; the magnetic components of the fixing ring are evenly arranged on the inner circumferential surface of the annular magnetic conductive core B along the circumferential direction of the annular magnetic conductive core B; the magnetization direction of the soft magnetic body in the magnetic component is along the radial direction of the annular magnetic conductive core B.

[0011] Further, the permanent magnets C of the high-speed rotor are evenly arranged on the end surface of the annular magnetic conductive core A along the circumferential direction of the annular magnetic conductive core A; the magnetization direction of the permanent magnets C is along the axis direction of the annular magnetic conductive core A; the magnetic components of the fixing ring are evenly arranged on the end surface of the annular magnetic conductive core B along the circumferential direction of the annular magnetic conductive core B; the magnetization direction of the soft magnetic body in the magnetic component is along the axis direction of the annular magnetic conductive core B.

[0012] Further, the magnetic modulation block is composed of a group of stacked silicon steel sheets.

[0013] Furthermore, the number of the permanent magnets C, magnetic components and magnetic adjustment blocks satisfies the formula 2P=Z1+Z2.

[0014] A control method for a demagnetization type electric-controlled permanent magnet gear is used to cut off and connect the power of the demagnetization type electric-controlled permanent magnet gear when the prime mover is operating normally. The method is characterized in that: the control method changes the magnetic field state of the magnetic component by applying a short-time pulse current to the coil to achieve the power on / off operation of the output shaft of the demagnetization type electric-controlled permanent magnet gear; the method comprises the following steps:

[0015] S1: In the initial state, the magnetic poles of the adjacent soft magnetic bodies on the fixed ring magnetic assembly are in opposite directions, the input shaft speed of the demagnetizing electric-controlled permanent magnet gear is ω1, and the output shaft speed is ω2=2ω1P / Z1;

[0016] S2: Keep the input shaft speed of the demagnetization electric control permanent magnet gear at ω1, apply pulse current to all coils at the same time, the direction of the magnetic field generated by the current in the coil is opposite to the magnetic field direction of the soft magnet at this time, then after the power is turned on, the power on the output shaft is zero;

[0017] S3: Keep the input shaft speed of the demagnetization electric control permanent magnet gear at ω1, and apply pulse current to all coils again at the same time. The direction of the current is opposite to the direction when the power is last applied. After the power is applied, the speed of the output shaft becomes ω2=2ω1P / Z1;

[0018] S4: The operations of S2 and S3 are repeated in a cycle to realize the power on / off control of the demagnetization type electric-controlled permanent magnet gear output shaft when the prime mover is in normal operation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can realize the control of power on and off by itself. Compared with the previous design scheme of clutch and transmission mechanism, the clutch and magnetic gear are integrated together, which can shorten the transmission chain to the maximum extent, improve the transmission efficiency, greatly save the use space, and meet more transmission equipment requirements such as limited space.

[0021] 2. The present invention realizes contactless, wear-free, lubrication-free and low-vibration power transmission.

[0022] 3. The invention has high-speed response, strong durability, and easy assembly and maintenance. Mechanical, hydraulic, and pneumatic clutches all require auxiliary equipment such as joysticks, pipelines, valves, and measuring instruments, while the control circuit of the invention is only a circuit design, without the need for other auxiliary equipment, and is also more convenient to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the high-speed rotor in the present invention;

[0025] Figure 3 It is a schematic structural diagram of the magnetic modulation ring in the present invention;

[0026] Figure 4 It is a schematic structural diagram of the fixing ring in the present invention;

[0027] Figure 5 It is a schematic structural diagram of the magnetic component in the present invention;

[0028] Figure 6 It is a schematic structural diagram of the magnetic component in the same magnetic state in the present invention;

[0029] Figure 7 It is a schematic structural diagram of the magnetic component in the demagnetized state in the present invention.

[0030] Among them, reference numerals: 1 - fixing ring; 2 - magnetic modulation ring; 3 - high-speed rotor; 4 - permanent magnet C; 5 - annular magnetic conducting core A; 6 - magnetic modulation block; 7 - low magnetic permeability material; 8 - annular magnetic conducting core B; 9 - magnetic component; 10 - soft magnetic body; 11 - coil; 12 - permanent magnet D; 13 - magnetic yoke; 14 - plane C; 15 - plane D1; 16 - plane D2. Specific embodiments

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0033] See the attached Figures 1 to 7, which shows the specific structure of an embodiment of a demagnetized electro-permanent magnet gear proposed by the present invention. The gear includes a fixed ring 1, a magnetic adjustment ring 2, a high-speed rotor 3 and a machine base (not shown in the figure); the magnetic adjustment ring 2 is coaxially arranged outside the circumference of the high-speed rotor 3; the fixed ring 1 is arranged outside the circumference of the magnetic adjustment ring 2; the fixed ring 1 is fixedly connected to the corresponding position of the machine base. Among them, the right end of the power input shaft is fixedly connected to the high-speed rotor 3, and the left end is connected to the original power; the magnetic adjustment ring 2 is fixedly connected to the left end of the output shaft. The intermediate transmission part is sequentially distributed from the inside to the outside by the high-speed rotor 3, the magnetic adjustment ring 2 and the fixed ring 1, and the high-speed rotor 3, the magnetic adjustment ring 2 and the fixed ring 1 are coaxial.

[0034] As Figure 2 shown, the high-speed rotor includes an annular magnetic conductive core A5 and Z1 permanent magnets C4; the Z1 permanent magnets C4 are uniformly arranged on the outer circumferential surface or end surface of the annular magnetic conductive core A5 along the circumferential direction of the annular magnetic conductive core A. Correspondingly, the magnetization direction of the permanent magnet C4 is along the radial direction or the axis direction of the annular magnetic conductive core A. In this embodiment, the Z1 permanent magnets C4 are evenly distributed on the outer circumferential surface of the annular magnetic conductive core A5 in a circumferential manner, and the magnetic poles of adjacent permanent magnets C4 are opposite; the input shaft, the annular magnetic conductive core A5 and the permanent magnet C4 are sequentially distributed from the inside to the outside, that is, the input shaft is connected to the inner circumferential surface of the annular magnetic conductive core A5; the permanent magnet C4 is connected to the outer circumferential surface of the annular magnetic conductive core A5. In this embodiment, the magnetization direction of the permanent magnet C4 of the high-speed rotor 3 is along the radial direction of the annular magnetic conductive core A5.

[0035] As Figure 3 shown, the magnetic adjustment ring 2 includes P magnetic adjustment blocks 6 and a low magnetic conductivity material 7 embedded in the filling groove; the magnetic adjustment blocks 6 are formed by stacking a group of silicon steel sheets; among them, the P magnetic adjustment blocks 6 are evenly spaced along the circumferential direction of the magnetic adjustment ring 2 body, and there is a filling groove between adjacent two magnetic adjustment blocks 6, and the low magnetic conductivity material 7 is embedded in the filling groove. The number P of the magnetic adjustment blocks 6 is related to the number Z1 of the magnetic poles of the permanent magnet C4 of the high-speed rotor and the number Z2 of the magnetic poles of the soft magnetic body 10 of the fixed ring, and the number P of the magnetic adjustment blocks 6 satisfies: 2P = Z1 + Z2. The high-speed rotor 3, the magnetic adjustment ring 2 and the fixed ring 1 are coaxially placed from the inside to the outside and are spaced from each other. The magnetic adjustment blocks 6 are opposite to the permanent magnets C4 in the high-speed rotor 3 and the magnetic components in the fixed ring 1 in the radial direction of the high-speed rotor 3, that is, the magnetic adjustment ring 2 is placed on the high-speed rotor 3 and an air gap is formed between the magnetic adjustment ring 2 and the high-speed rotor 3, and the fixed ring 1 is placed on the magnetic adjustment ring 2 and an air gap is formed between the fixed ring 1 and the magnetic adjustment ring 2.

[0036] As Figure 4As shown, the fixed ring 1 includes Z2 magnetic components and an annular magnetic core B8; the magnetic components of the fixed ring 1 are evenly arranged on the inner circumferential surface or end surface of the annular magnetic core B8 along the circumferential direction of the annular magnetic core B8. Correspondingly, the magnetization direction of the soft magnetic body 10 in the magnetic component is along the radial direction or axial direction of the annular magnetic core B8. In this embodiment, the magnetic components of the fixed ring 1 are evenly arranged on the inner circumferential surface of the annular magnetic core B8 along the circumferential direction of the annular magnetic core B8, and the magnetization direction of the soft magnetic body 10 in the magnetic component is along the radial direction of the annular magnetic core B8. The fixed ring 1 is fixed by connecting with the machine base. The fixed ring 1 and the high-speed rotor 3 form a magnetic field, and the magnetic modulation ring 2 rotates in the formed magnetic field and rotates in the same direction as the high-speed rotor 3.

[0037] As Figure 5 shown, the magnetic component is located in the fixed ring 1, where the magnetic component includes a soft magnetic body 10, a set of coils 11, two permanent magnets D12, and a magnetic yoke 13; a cubic connection end is provided on the outer side surface of the magnetic yoke 13, and the electromagnetic coil 11 is wound around the soft magnetic body 10; the lower end of the soft magnetic body 10 is fixedly connected to the upper horizontal plane C14 of the connection end of the magnetic yoke 13; the two permanent magnets D12 are connected to the magnetic yoke 13 and are respectively placed on two planes D115 and D216 parallel to the connection end on its left and right sides. The plane C14 is perpendicular to the planes D115 and D216. The magnetic field direction of the permanent magnet D12 is perpendicular to the planes D115 and D216. The magnetic field directions of the two permanent magnets D12 on the same magnetic yoke 13 are opposite, and the same magnetic poles face each other. That is, the upper end plane C14 of the magnetic yoke 13 is connected to the soft magnetic body 10 around which the coil 11 is wound, and the planes D115 and D216 perpendicular to the plane C14 are respectively connected to a permanent magnet D12; the inner end faces of the magnetic yokes 13 in each magnetic component are arc-shaped, evenly and continuously distributed, and have a certain gap from the magnetic modulation ring 2. The soft magnetic body 10 is fixedly connected to the magnetic yoke 13, each soft magnetic body 10 is connected to a magnetic yoke 13, and the magnetic poles of the soft magnetic bodies 10 in adjacent magnetic components are opposite.

[0038] Basic working principle and control method of this embodiment:

[0039] Assume that the motor is connected to the high-speed rotor 3 for transmission, the left end of the input shaft is connected to the motor, the right end of the input shaft is connected to the high-speed rotor 3, the motor drives the input shaft to rotate, and the power is transmitted to the high-speed rotor 3. The high-speed rotor 3 and the fixed ring 1 form a magnetic field, and the magnetic modulation ring 2 cuts the magnetic field. Since the fixed ring 1 is fixed, the high-speed rotor 3 transmits the power to the magnetic modulation ring 2 under the action of magnetic field modulation, and the rotation directions of the high-speed rotor 3 and the magnetic modulation ring 2 are the same. The magnetic modulation ring 2 is connected to the output shaft and transmits the power to the output shaft.

[0040] The control method specifically includes the following steps:

[0041] S1: In the initial state, the overall connection structure is as shown in Figure 1 . On the fixed ring 1, the magnetic pole directions of the adjacent soft magnets 10 of the magnetic components are opposite. The internal magnetic field distribution of the magnetic components is as shown in Figure 6 . The magnetic pole of the soft magnet 10 close to the yoke 13 has the same direction as the magnetic pole of the permanent magnet D12 close to the yoke 13. The magnetic induction lines generated by the soft magnet 10 and the permanent magnet D12 both pass through the yoke 13, generating a magnetic field in the air gap between the yoke 13 and the magnetic modulation ring 2, and the magnetic poles of adjacent magnetic components are opposite. The input shaft drives the high-speed rotor 3 to rotate. When the rotational speed of the input shaft of the demagnetization type electronically controlled permanent magnet gear is ω1, the transmission ratio G r is the number P of the magnetic modulation blocks 6 of the magnetic modulation ring 2 divided by the number of magnetic pole pairs P1 of the high-speed rotor 3 (P1 = Z1 / 2). Then the output rotational speed of the magnetic modulation ring 2 driving the output shaft is ω2 = 2ω1P / Z1.

[0042] S2: First power-on: Keep the rotational speed ω1 of the input shaft unchanged, and apply a short pulse current to the coil 11, as shown in Figure 7 . The magnetic field direction generated by the current in the coil 11 is opposite to the magnetic field direction in the soft magnet 10. The magnetic fields of the permanent magnets D12 on the horizontal two sides of the yoke 13 inside are cancelled out, and the surface of the yoke 13 loses magnetism. When the high-speed rotor 3 rotates, the magnetic modulation ring 2 cannot rotate anymore. At this time, the high-speed rotor 3 rotates idly, and the output shaft has no power output.

[0043] S3: Second power-on: Without stopping the input of the prime mover (that is, the rotational speed of the input shaft of the demagnetization type electronically controlled permanent magnet gear is ω1), apply a reverse pulse current to the coil 11 again. The coil 11 acts on the soft magnet 10 to change the magnetic pole direction of the soft magnet 10, and the internal magnetic field of the magnetic component returns to as shown in Figure 6 . After the power-on is completed, the rotational speed of the output shaft becomes ω2 = 2ω1P / Z1.

[0044] S4: Repeat the operations of S2 and S3 above, and the control of power on / off of the output shaft of the demagnetization type electronically controlled permanent magnet gear can be realized under the normal operation of the prime mover.

[0045] Therefore, the demagnetization type electronically controlled permanent magnet gear provided in this embodiment combines a clutch with a magnetic gear, which can save space and improve the transmission efficiency.

[0046] Matters not detailed in the present invention are well-known technologies.

[0047] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A demagnetizing type electro-permanent magnet gear, comprising a high-speed rotor, a magnetic modulation ring, a fixed ring and a machine base; the magnetic modulation ring is coaxially arranged on the circumferential outer side of the high-speed rotor; the fixed ring is coaxially arranged on the circumferential outer side of the magnetic modulation ring; the fixed ring is fixedly connected with the machine base; the high-speed rotor is connected with an input shaft; the magnetic modulation ring is connected with an output shaft; and it is characterized in that: The high-speed rotor is composed of an annular magnetic conductive core A and Z1 permanent magnets C. The permanent magnets are evenly distributed along the circumference of the annular magnetic conductive core A, and the adjacent permanent magnets have opposite magnetic poles. P magnetic modulation blocks are arranged at equal intervals in the circumferential direction of the magnetic modulation ring, and low magnetic permeability materials are filled between adjacent magnetic modulation blocks. A certain gap is provided between the permanent magnets on the high-speed rotor and the magnetic modulation ring. The fixed ring is composed of an annular magnetic conductive core B and Z2 magnetic components. The magnetic component includes a soft magnetic body, two permanent magnets D, a group of coils, and a magnetic yoke. A cubic connection end is provided on the magnetic yoke. The coils are wound around the soft magnetic body. The soft magnetic body is fixedly connected to a plane C on the connection end of the magnetic yoke. The permanent magnets D are respectively fixedly connected to two parallel planes D1 and D2 on the connection end of the magnetic yoke, and the plane C is perpendicular to the planes D1 and D2. The magnetic field directions of the permanent magnets D are all perpendicular to the planes D1 and D2. The magnetic field directions of the two permanent magnets D on the same magnetic yoke are opposite. The magnetic components are evenly distributed along the circumference of the annular magnetic conductive core B, and the magnetic poles of the soft magnetic bodies in adjacent magnetic components are opposite. A certain gap is provided between the magnetic yoke and the magnetic modulation ring.

2. The demagnetization type electro-permanent magnetic gear according to claim 1, wherein: The permanent magnets C of the high-speed rotor are evenly arranged on the outer circumferential surface of the annular magnetic conductive core A along the circumferential direction of the annular magnetic conductive core A. The magnetization direction of the permanent magnets C is along the radial direction of the annular magnetic conductive core A. The magnetic components of the fixed ring are evenly arranged on the inner circumferential surface of the annular magnetic conductive core B along the circumferential direction of the annular magnetic conductive core B. The magnetization direction of the soft magnetic body in the magnetic component is along the radial direction of the annular magnetic conductive core B.

3. The demagnetization type electro-permanent magnet gear according to claim 1, characterized in that: The permanent magnets C of the high-speed rotor are evenly arranged on the end face of the annular magnetic conductive core A along the circumferential direction of the annular magnetic conductive core A. The magnetization direction of the permanent magnets C is along the axial direction of the annular magnetic conductive core A. The magnetic components of the fixed ring are evenly arranged on the end face of the annular magnetic conductive core B along the circumferential direction of the annular magnetic conductive core B. The magnetization direction of the soft magnetic body in the magnetic component is along the axial direction of the annular magnetic conductive core B.

4. A demagnetized electro-permanent magnet gear according to claim 1, characterized in that: The magnetic modulation block is composed of a group of stacked silicon steel sheets.

5. A demagnetized electro-permanent magnet gear according to claim 1, characterized in that: The numbers of the permanent magnets C, magnetic components, and magnetic modulation blocks satisfy the formula 2P = Z1 + Z2.

6. A control method for a demagnetization type electronically controlled permanent magnet gear according to claim 5, which is used to cut off and connect the power of the demagnetization type electronically controlled permanent magnet gear when the prime mover is operating normally, and is characterized in that: The control method realizes the power on / off operation of the output shaft of the demagnetization type electronically controlled permanent magnet gear by applying a short-time pulse current to the coils to change the magnetic field state of the magnetic components. It includes the following steps: S1: In the initial state, the magnetic poles of the adjacent soft magnetic bodies on the magnetic components of the fixed ring are opposite, the rotational speed of the input shaft of the demagnetization type electronically controlled permanent magnet gear is ω1, and at this time the rotational speed of the output shaft is ω2 = 2ω1P / Z1. S2: Keep the rotational speed of the input shaft of the demagnetization type electronically controlled permanent magnet gear as ω1, and apply pulse currents to all the coils simultaneously. The magnetic field direction generated by the current in the coils is opposite to the magnetic field direction of the soft magnetic body at this time. After the power-on is completed, the power on the output shaft is zero. S3: Keep the rotational speed of the input shaft of the demagnetization type electronically controlled permanent magnet gear as ω1, and apply pulse currents to all the coils simultaneously again. The direction of the current is opposite to the direction during the previous power-on. After the power-on is completed, the rotational speed of the output shaft becomes ω2 = 2ω1P / Z1. S4: By performing the operations of S2 and S3 in a loop, it is possible to achieve the on / off control of the power output shaft of the demagnetization type electro-controlled permanent magnet gear under the condition that the prime mover is operating normally.

Images