Differential frequency high frequency motor

Abstract

The present invention discloses a differential frequency high-frequency motor, comprising a stator, a rotor, a stator coil, a rotor coil, and a transmission shaft. The transmission shaft is located on the central axis of the differential frequency high-frequency motor, and the stator, stator coil, rotor, and rotor coil are distributed outside the transmission shaft. The motor also comprises a high-frequency excitation generator connected to the rotor coil. The high-frequency excitation generator inputs a two-phase or three-phase low-power high-frequency current, and outputs a high-frequency excitation current that is input into the rotor coil. The present invention uses high-frequency input current to significantly reduce the manufacturing cost of the motor and reduce its size. In particular, the present invention facilitates power transmission and speed regulation when used in automobile or ship drives. The motor has broad application prospects, and both motor manufacturers and users can save significant costs, save energy, and reduce consumption, thereby generating both good economic and social benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-frequency motors, and in particular relates to a differential frequency high-frequency motor. Background Art

[0002] Motors, including generators and motors, have historically used low power input frequencies of 50 or 60 Hz. This results in high electromagnetic material consumption and manufacturing costs for the coils within these motors and generators. In particular, motors designed to output high currents require extremely large, bulky structures, making installation and transportation difficult. Therefore, developing a compact, high-power motor has become a research topic for those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a differential frequency high-frequency motor, which uses high-frequency input current to significantly reduce the manufacturing cost of the motor, reduce its size, and has broad prospects for use. Both motor manufacturers and users can save a lot of costs and reduce energy consumption.

[0004] The term "high-frequency motor" in this article refers to rotating electrical machines with operating frequencies significantly higher than the 50-60 Hz mains power frequency. Operating frequencies exceeding 1000 Hz are considered to be significantly higher than the mains power frequency. With current technology and materials, the frequencies used by businesses are in the tens of kilohertz range, though this can be increased to the MHz range when needed. The frequencies of the motor's rotor and stator currents are always different, and the speed-induced frequency is significantly different from the excitation frequency, hence the term "difference frequency."

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a differential frequency high-frequency motor, comprising a stator, a rotor, a stator coil, a rotor coil and a transmission shaft, wherein the transmission shaft is located on the central axis of the differential frequency high-frequency motor, and the stator, stator coil, rotor and rotor coil are distributed outside the transmission shaft, and further comprising a high-frequency excitation generator, wherein the high-frequency excitation generator is connected to the rotor coil, and a two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator, and the output high-frequency excitation current is input into the rotor coil.

[0006] The technical solutions further improved in the above technical solutions are as follows:

[0007] 1. In the above scheme, when the high-frequency excitation current is passed through the rotor coil, a high-speed rotating magnetic field is generated. When a high-frequency current is passed through the stator coil and there is a frequency difference or phase difference between the stator and the rotor, the transmission shaft outputs torque and speed. At this time, the differential frequency high-frequency motor realizes the function of an electric motor.

[0008] 2. In the above scheme, after the high-frequency excitation current is passed into the rotor coil, a high-speed rotating magnetic field will be generated. When a power source is input to the transmission shaft, the stator coil outputs a high-frequency current. At this time, the differential frequency high-frequency motor realizes the function of a generator.

[0009] 3. In the above scheme, a two-phase or three-phase high-frequency current with a higher or lower frequency than the rotor coil input current is passed through the stator coil to generate a rotating magnetic field with the same rotation direction as the rotor, and the transmission shaft outputs power to the mechanical equipment.

[0010] 4. In the above scheme, when the stator coil frequency is higher than the rotor coil frequency, the rotor rotation direction is the same as the high-speed rotating magnetic field direction; when the stator coil frequency is lower than the rotor coil frequency, the rotor rotation direction is opposite to the high-speed rotating magnetic field direction. By adjusting the rotor coil frequency, the speed and direction can be adjusted.

[0011] 5. In the above solution, a two-phase or three-phase current with the same frequency as the rotor coil is passed through the stator coil, and the transmission shaft generates speed and torque by adjusting the phase of the stator coil and the rotor coil.

[0012] 6. In the above scheme, the stator phase always leads the rotor, causing the rotor to continuously accelerate in the same direction as the rotating magnetic field. Adjusting the phase can adjust the torque. Conversely, the stator phase can always lag the rotor, causing the rotor to continuously accelerate in the opposite direction of the rotating magnetic field. Through closed-loop automatic control using position and speed sensors, the motor torque, i.e., speed and direction of rotation, can be adjusted according to the load.

[0013] 7. In the above solution, a plurality of stator windings are provided in the differential frequency high frequency motor, and by changing the connection mode of the rotor coils, the corresponding stator coils can output a plurality of high frequency currents.

[0014] 8. In the above scheme, in addition to changing the number of magnetic pole pairs, the connection method includes the following four cases:

[0015] 1) When the excitation direction of the high-frequency excitation generator is in the same direction as the transmission shaft, and the rotation direction of the generator rotor's rotating magnetic field is the same as the rotation direction of the transmission shaft, the generator output frequency is the same as the high-frequency excitation generator input frequency;

[0016] 2) When the excitation direction of the high-frequency excitation generator is in the same direction as the transmission shaft, and the rotation direction of the rotating magnetic field of the generator's main rotor is opposite to the rotation direction of the transmission shaft, the generator output frequency is lower than the input side of the high-frequency excitation generator;

[0017] 3) When the excitation direction of the high-frequency excitation generator is opposite to the direction of the transmission shaft, and the rotation direction of the rotating magnetic field of the generator's main rotor is the same as the rotation direction of the transmission shaft, the generator output frequency is higher than the input side of the high-frequency excitation generator;

[0018] 4) When the excitation direction of the high-frequency excitation generator is opposite to the direction of the transmission shaft, and the rotation direction of the rotating magnetic field of the generator's main rotor is opposite to the rotation direction of the transmission shaft, the generator output frequency is the same as the high-frequency excitation generator input frequency.

[0019] 9. In the above solution, the generators obtained by the connection methods 1) and 4) are same-frequency generators.

[0020] 10. In the above solution, the stator and rotor cores are made of silicon steel sheets or ferrite cores.

[0021] 11. In the above scheme, the structural forms of the high-frequency motor include the following:

[0022] 1) The diameter of the excitation generator is much smaller than that of the stator, and the rotor excitation coil is connected to the rotor coil by a wire;

[0023] 2) The stator core of the rotor-excited generator has the same diameter as the main stator core and is divided into two sections, with different axial thicknesses. The rotor core is also divided into two sections, and the rotor is similar to the squirrel cage rotor of a power frequency motor. The middle wire connection part can also serve as a cooling fan. This structure is relatively simple and the manufacturing process is relatively easy.

[0024] 3) The excitation power is connected to the rotor excitation coil using slip rings and brushes, which is basically the same as the existing wound-type motor structure, except that the number of turns is very small.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] 1. The differential frequency high-frequency motor of the present invention uses high-frequency input current, which greatly reduces the manufacturing cost of the motor and reduces its size. In particular, it is used in automobile or ship drives, facilitating both power transmission and speed regulation. It has broad prospects for use and can save a lot of costs for both motor manufacturers and users, saving energy and reducing consumption, thereby generating good economic benefits and achieving good social benefits.

[0027] 2. The differential frequency high-frequency motor of the present invention achieves the effect of reducing the size of the motor by inputting different high-frequency currents on the stator side and the rotor side, and using the difference between the two frequencies as the basis for the motor speed. In the field of high-power high-frequency motors, it is possible to reduce the cost of the motor by more than 80%.

[0028] 3. The differential frequency high-frequency motor of the present invention can output high-frequency and high-power current on the stator side by inputting high-frequency current on the rotor side in conjunction with the input of a mechanical power source, which is equivalent to a high-frequency power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attachment Figure 1 This is a schematic diagram of the first structure of the high-frequency motor of the present invention.

[0030] Attachment Figure 2 This is a schematic diagram of the second structure of the high-frequency motor of the present invention.

[0031] Attachment Figure 3 This is a schematic diagram of the structure of the high-frequency motor of the present invention for use in ocean wave power generation.

[0032] In the figure: 1. High-frequency excitation generator; 2. Stator coil; 3. Rotor coil; 4. Transmission shaft; 5. Bearing; 6. Stator core; 7. Rotor core; 8. Fixed pile; 9. Transmission slide rod; 10. Gravity float. DETAILED DESCRIPTION

[0033] In the description of this patent, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, for example, to mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this patent in specific circumstances.

[0034] The present invention will be further described below in conjunction with the embodiments:

[0035] A differential frequency high frequency motor includes a stator, a rotor, a stator coil 2, a rotor coil 3 and a transmission shaft 4. The transmission shaft 4 is located on the central axis of the differential frequency high frequency motor, and the stator, stator coil 2, rotor and rotor coil 3 are distributed outside the transmission shaft 4.

[0036] Example 1: When used as a high-frequency motor:

[0037] A differential frequency high-frequency motor further includes a high-frequency excitation generator 1 connected to a rotor coil 3. A two-phase or three-phase low-power high-frequency current is input into the high-frequency excitation generator 1. The output high-frequency excitation current is input into the rotor coil 3, causing the rotor to generate a high-speed rotating magnetic field. A two-phase or three-phase current with a frequency higher or lower than the excitation frequency is input into the stator coil, causing the stator to generate a rotating magnetic field with the same rotation direction as the rotor.

[0038] When the stator frequency is higher than the rotor frequency, the rotor will rotate in the same direction as the rotating magnetic field, and the rotor outputs a speed that is the difference between the two frequencies. The speed is positively correlated with the difference between the two frequencies.

[0039] On the contrary, when the stator frequency is lower than the rotor frequency, the rotor rotation direction is opposite to the direction of the high-frequency rotating magnetic field, and the rotor outputs a speed that is the difference between the two frequencies. The speed is positively correlated with the difference between the two frequencies and is also inversely correlated with the number of magnetic poles of the motor.

[0040] The rotor outputs torque, completing the motor's function of converting electrical energy into mechanical energy. Adjusting the frequency on the excitation side can smoothly adjust both the speed and direction, and the power required on the excitation side is not large.

[0041] When the two frequencies are the same, the rotor speed is zero. By varying the phase difference between the rotor and stator, high-frequency motors generate torque, resulting in smaller size. The principle is as follows: High-frequency currents of the same frequency flow through the stator coils 2 and rotor coils 3 of a high-frequency motor. Position and speed sensors mounted on the rotor adjust the phase between the rotor excitation and the stator high-frequency current to generate torque. If the position sensor consistently keeps the stator phase ahead of the rotor, the rotor is constantly accelerating in the same direction as the rotating magnetic field. Adjusting the phase can adjust the torque. Conversely, if the stator phase consistently lags the rotor, the rotor is constantly accelerating in the opposite direction of the rotating magnetic field. Using position and speed sensors through closed-loop automatic control, the phase can be adjusted according to the load to vary the motor torque—i.e., the speed and direction of rotation—to generate the desired speed and torque for motor operation. This is somewhat similar to the operating principles of brushless DC motors and vector control. The difference between this motor and the motor based on differential frequency as the speed basis is that the rotor current always operates at pure high frequency. Because the same frequency is used, the applicable frequency can theoretically be higher. However, since it is a motor that operates at high frequency with the same frequency and phase modulation, if the servo system fails and the protection system is not perfect and there is no timely response, the probability of stall danger is very high, which will limit the possibility of using this type of motor in certain occasions.

[0042] The current frequency input to the stator coil and rotor coil in this high-frequency motor is greater than 1000HZ.

[0043] Example 2: When used as a high-frequency generator:

[0044] A differential frequency high-frequency motor further includes a high-frequency excitation generator 1 connected to a rotor coil 3. A two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator 1, and the output high-frequency excitation current is input to the rotor coil 3, causing the rotor to generate a high-speed rotating magnetic field. At the same time, a power source is connected to the transmission shaft to provide mechanical energy to the rotor.

[0045] If the rotating magnetic field of the excitation generator rotates in the opposite direction of the rotor, causing the rotor coil to cut through the magnetic lines of force and generate current, a frequency equal to the excitation frequency plus the rotor speed is generated within the rotor coil. As long as the direction of rotation of the magnetic field of the excitation generator matches the direction of the rotating magnetic field generated by the rotor on the stator side, an electromotive force with the same frequency as the excitation input is generated on the stator output side (this frequency is also related to the number of magnetic pole pairs in the stator and rotor coils). This achieves the generator function of converting mechanical energy into electrical energy.

[0046] By changing the connection method of the rotor coil, the output frequency of the stator coil can be changed: the specific connection forms are as follows:

[0047] 1) When the excitation direction of the excitation generator is in the same direction as the transmission shaft, and the rotation direction of the generator rotor's rotating magnetic field is the same as the shaft's rotation direction, the generator output frequency is the same as the frequency applied by the excitation generator.

[0048] That is: fc = fr

[0049] Where: fc is the output frequency, fr is the input frequency of the excitation generator (the same below).

[0050] 2) When the excitation direction of the excitation generator is in the same direction as the transmission shaft, and the rotation direction of the generator rotor rotating magnetic field is opposite to the rotation direction of the shaft, the generator output frequency is lower than the input side of the excitation generator.

[0051] That is: fc = fr - 2fz

[0052] Where: fz is the frequency generated by the shaft rotation (for simplicity of description, the number of magnetic pole pairs is set to 1).

[0053] 3) When the excitation direction of the excitation generator is opposite to the direction of the transmission shaft, and the rotation direction of the generator rotor rotating magnetic field is the same as the rotation direction of the shaft, the generator output frequency is higher than the input side of the excitation generator.

[0054] That is: fc=fr+2fz (the generator with squirrel-cage rotor belongs to this category).

[0055] 4) When the excitation direction of the excitation generator is opposite to the direction of the transmission shaft, and the rotation direction of the generator rotor rotating magnetic field is opposite to the rotation direction of the shaft, the generator output frequency is the same as the excitation generator input frequency.

[0056] That is: fc = fr (usually a more suitable connection method for a generator or a synchronous frequency generator).

[0057] The generators obtained by the connection modes 1) and 4) are same-frequency generators.

[0058] Example 3: When using a high-frequency generator and a high-frequency motor in combination:

[0059] A differential frequency high-frequency motor also includes a high-frequency excitation generator 1 connected to a rotor coil 3. A two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator 1, and the output high-frequency excitation current is input into the rotor coil 3, causing the rotor to generate a high-speed rotating magnetic field. Simultaneously, a power source is connected to the transmission shaft to provide mechanical energy to the rotor, thereby realizing the high-frequency motor's generator function. Two sets of stator windings are provided in the high-frequency generator. Due to the different connection methods of the rotor coils, the two sets of stator coils output two or more different frequency potentials.

[0060] These two high-frequency currents are respectively passed into the stator coil and rotor coil sides of the motor to realize the function of the motor.

[0061] This structure combines a generator and an electric motor to realize the input of high-frequency current of different frequencies to the electric motor, and can be applied to many fields such as automobiles.

[0062] High-frequency motors and high-frequency generators can adopt the following structures:

[0063] like Figure 1 As shown, the diameter of the high-frequency excitation generator 1 is much smaller than that of the stator core 6. The stator coil 2 is wound on the stator core 6, and the rotor coil 3 is wound on the rotor core 7. The rotor excitation coil of the high-frequency excitation generator 1 is connected to the rotor coil 3 by a wire, and a bearing 5 is provided at the position where the transmission shaft 4 is connected to the casing.

[0064] like Figure 2 As shown, the stator core of the high-frequency excitation generator 1 has the same diameter as the stator core 6 and is divided into two sections, differing only in axial thickness. The rotor core 7 is also divided into two sections, and the rotor resembles the squirrel cage rotor of an industrial frequency motor. The central conductor connection section also serves as a cooling fan. This structure is relatively simple and the manufacturing process is relatively easy.

[0065] 3. The third structural form of induction excitation high-frequency motor: the excitation power is connected to the rotor excitation coil using slip rings and brushes, which is basically the same as the existing winding motor structure, but with a small number of turns.

[0066] The above content of the present invention is further explained as follows:

[0067] 1. Generators and motors are electromagnetic power conversion devices. At the same current, the higher the frequency, the fewer excitation turns of the electrical coils used for electromagnetic characteristics with the same magnetic field strength. Therefore, the higher the frequency of use, the less material the motor requires and the smaller the volume. In addition, the copper loss is smaller and the efficiency is improved. When adjusting the speed of the motor, it is only necessary to adjust the frequency of the excitation side. The power required for adjustment is relatively small, which is convenient for reducing costs.

[0068] 2. The high-frequency generator can also be used as a high-power long-wave (KHZ) and short-wave (MHZ level) high-frequency power amplifier (same-frequency generator). As long as the rotor coil is properly connected and the direction of the rotating magnetic field of the excitation generator and the rotating magnetic field generated by the main excitation are swapped, the frequency of the magnetic field at the shaft end is complementary to the shaft speed, so the output frequency is highly consistent with the excitation frequency and has nothing to do with the rotation speed.

[0069] 3. It can be used as a medium frequency power generator for material processing (medium frequency quenching).

[0070] 4. In addition to general uses, the same-frequency generator using this technology can be used as a high-frequency power amplifier, providing an application channel for high-power high-frequency generators required in special application fields.

[0071] 5. Used in ships for long-distance power transmission. Because this technology can miniaturize high-frequency, high-power generators and motors and facilitate speed and direction regulation, the ship's fuel engine can be installed in any convenient location without being constrained by traditional bulky mechanical transmission devices.

[0072] 6. In the automotive manufacturing industry, full electric control and stepless speed change can be achieved while reducing costs. The engine can always operate in the high-efficiency range through automatic control devices, thereby improving the fuel efficiency of the vehicle and improving transportation efficiency due to the miniaturization of the power transmission volume.

[0073] 7. In production links that require speed linkage (such as papermaking, packaging and other industries), a high-frequency generator can be used to supply power. The frequency can be uniformly adjusted on the generator side to adjust the speed of the production line, achieving precise adjustment and reducing equipment purchase costs.

[0074] 8. Because the speed of the same-frequency generator can be basically ignored and the speed is only related to the power, it is particularly suitable for low-speed hydro-turbine generators and wind turbine generators, which can greatly reduce costs. The excitation side can use AC power. As long as the rotor is connected correctly, the output frequency of the unit can be the same as the excitation frequency and is in the same-frequency generator state. Moreover, during operation, the impact on the power grid during grid-connected operation can be basically eliminated.

[0075] 9. Since the cost of high-power differential frequency high-frequency motors has been greatly reduced, in many cases, the purchase of speed change devices can be eliminated and replaced by small electronic frequency conversion and other speed control devices.

[0076] 10. High-frequency generators using squirrel-cage rotors can simplify the manufacturing process, make the operation more reliable, and reduce the maintenance burden.

[0077] 11. Since the same frequency generator in the form of power amplifier has a higher excitation frequency, it is suitable for mechanical low-speed power sources and can be applied to wave power generation in theory, such as Figure 3 As shown, a fixed pile 8 is set on the sea surface to fix the high-frequency generator above the sea surface. This high-frequency generator is connected to a transmission slide 9. A gravity float 10 is provided at the bottom of the transmission slide 9. This gravity float 10 is located on the sea surface and rises and falls with the waves. Since the windings of the same-frequency generator are properly connected, the output frequency is not affected by the movement speed. As long as a high-frequency current is input at the appropriate time to make the direction of movement of the excitation magnetic field opposite to the external power, the linear or swing high-frequency generator becomes a same-frequency generator, which solves the problem of low and volatile wave movement speed and difficult energy extraction.

[0078] 12. As long as the operating frequency of the high-frequency motor exceeds the audio range (above 20KHZ), the noise of the motor will be greatly reduced, making the working environment more friendly.

[0079] When using this technology, it's important to note that protective measures are required to prevent runaway accidents due to inconsistent rotor and stator currents or rotor overspeed in the event of a fault. However, when used in a single closed-loop configuration with one generator connected to one motor, this is technically easily overcome and rarely presents a problem. The generator's excitation must include current-limiting measures such as reactors or capacitors to prevent excessive excitation current. Furthermore, when operating at high frequencies, the number of magnetic pole pairs should be greater than two; otherwise, magnetic flux leakage from the metal shaft may cause high temperatures.

[0080] The differential frequency high-frequency motor of the present invention will significantly reduce motor manufacturing costs. If widely adopted, this technology will significantly reduce costs for motor manufacturers and users, achieving excellent energy-saving and environmental protection effects. While creating very considerable economic benefits for enterprises, it will also achieve good social benefits.

[0081] Due to the difficulty of frequency and current control, this technology is limited to transportation vehicles such as cars, ships, and airplanes in the initial application stage. It has a single closed-loop structure with one generator corresponding to one motor. It can be applied to other fields after the technology has matured.

[0082] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A differential frequency high-frequency motor, comprising a stator, a rotor, a stator coil (2), a rotor coil (3) and a transmission shaft (4), wherein the transmission shaft (4) is located on the central axis of the differential frequency high-frequency motor, and the stator, stator coil (2), rotor and rotor coil (3) are distributed outside the transmission shaft (4), characterized in that: The invention also includes a high-frequency excitation generator (1), which is connected to the rotor coil (3). A two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator (1), and the output high-frequency excitation current is input to the rotor coil (3).

2. The differential frequency high frequency motor according to claim 1, characterized in that: When the high-frequency excitation current is passed through the rotor coil (3), a high-speed rotating magnetic field is generated. When a high-frequency current is passed through the stator coil (2), and there is a frequency difference or phase difference between the stator and the rotor, the transmission shaft (4) outputs torque and speed. At this time, the frequency-difference high-frequency motor realizes the function of an electric motor.

3. The differential frequency high frequency motor according to claim 1, characterized in that: After the high-frequency excitation current is passed into the rotor coil (3), a high-speed rotating magnetic field is generated. When a power source is input to the transmission shaft (4), the stator coil (2) outputs a high-frequency current. At this time, the differential frequency high-frequency motor realizes the function of a generator.

4. The differential frequency high frequency motor according to claim 2, characterized in that: A two-phase or three-phase high-frequency current with a frequency higher or lower than that of the rotor coil (3) is passed through the stator coil (2), generating a rotating magnetic field with the same rotation direction as the rotor, and the transmission shaft (4) outputs power to the mechanical equipment.

5. The differential frequency high frequency motor according to claim 4, characterized in that: When the current frequency of the stator coil (2) is higher than the current frequency of the rotor coil (3), the direction of rotor rotation is the same as the direction of the high-speed rotating magnetic field; when the current frequency of the stator coil (2) is lower than the current frequency of the rotor coil (3), the direction of rotor rotation is opposite to the direction of the high-speed rotating magnetic field. By adjusting the current frequency of the rotor coil (3), the speed and direction of rotation can be adjusted.

6. The differential frequency high frequency motor according to claim 2, characterized in that: A two-phase or three-phase current with the same current frequency as the rotor coil (3) is passed through the stator coil (2), and the transmission shaft (4) generates a rotational speed and torque by adjusting the phases of the stator coil (2) and the rotor coil (3).

7. The differential frequency high frequency motor according to claim 6, characterized in that: When the stator phase is ahead of the rotor, the rotor is always in an accelerating state in the same direction as the rotating magnetic field, and the torque can be adjusted by adjusting the phase size; conversely, when the stator phase lags behind the rotor, the rotor is always in an accelerating state in the opposite direction of the rotating magnetic field.

8. The differential frequency high frequency motor according to claim 3, characterized in that: A plurality of stator windings are arranged in the differential frequency high-frequency motor, and the corresponding stator coils (2) are made to output a plurality of high-frequency currents by changing the connection mode of the rotor coils (3).

9. The differential frequency high frequency motor according to claim 8, characterized in that: The connection method includes the following four cases: 1) When the excitation direction of the high-frequency excitation generator (1) is the same as that of the transmission shaft (4), and the rotation direction of the rotating magnetic field of the generator rotor is the same as that of the transmission shaft (4), the output frequency of the generator is the same as the input frequency of the high-frequency excitation generator (1); 2) When the excitation direction of the high-frequency excitation generator (1) is the same as that of the transmission shaft (4), and the rotation direction of the generator rotor rotating magnetic field is opposite to the rotation direction of the transmission shaft (4), the generator output frequency is lower than the input side of the high-frequency excitation generator (1); 3) When the excitation direction of the high-frequency excitation generator (1) is opposite to the direction of the transmission shaft (4), and the rotation direction of the generator rotor rotating magnetic field is the same as the rotation direction of the transmission shaft (4), the generator output frequency is higher than the input side of the high-frequency excitation generator (1); 4) When the excitation direction of the high-frequency excitation generator (1) is opposite to the direction of the transmission shaft (4), and the rotation direction of the generator rotor rotating magnetic field is opposite to the rotation direction of the transmission shaft (4), the generator output frequency is the same as the input frequency of the high-frequency excitation generator (1).

10. The differential frequency high frequency motor according to claim 1, characterized in that: The iron cores of the stator and the rotor are made of silicon steel sheets or ferrite cores.

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