CN111293846A - Difference frequency type high-frequency motor - Google Patents

Abstract

The invention discloses a difference frequency type high-frequency motor which comprises a stator, a rotor, a stator coil, a rotor coil and a transmission shaft, wherein the transmission shaft is positioned on a central axis of the difference frequency type high-frequency motor, the stator coil, the rotor and the rotor coil are distributed on the outer side of the transmission shaft, the difference frequency type high-frequency motor also comprises a high-frequency excitation generator, the high-frequency excitation generator is connected to the rotor coil, two-phase or three-phase low-power high-frequency current is input into the high-frequency excitation generator, and the output high-frequency excitation current is input into the rotor coil. The invention uses high-frequency input current, so that the manufacturing cost of the motor is greatly reduced, and the volume is reduced; especially, the speed regulator is used for driving automobiles or ships, thereby facilitating power transmission and speed regulation; the motor has wide application prospect, can save a large amount of cost, save energy and reduce consumption no matter the motor is manufactured or a user, can generate good economic benefit, and can also obtain good social benefit.

Description

Difference frequency type high-frequency motor

Technical Field

The invention belongs to the technical field of high-frequency motors, and particularly relates to a difference frequency type high-frequency motor.

Background

The motor comprises a generator and a motor, and because of historical reasons, the input of the generator and the motor adopts power frequency 50 and 60HZ with very low frequency, the consumption of coil electromagnetic materials in the motor and the generator is large, the manufacturing cost is high, and particularly, for outputting a motor with high-power current, the size of the motor and the coil electromagnetic materials in the generator need to be very large, the whole structure is very heavy, and the installation and transportation are very inconvenient. Therefore, how to develop a motor which is small in size and can output high power becomes a research direction of those skilled in the art.

Disclosure of Invention

The invention aims to provide a difference frequency type high-frequency motor, which uses high-frequency input current, greatly reduces the manufacturing cost of the motor, reduces the volume, has wide use prospect, can save a large amount of cost for both the motor manufacturing and users, saves energy and reduces consumption.

The high-frequency motor is a rotating motor with the working frequency far higher than the commercial power frequency of 50-60 HZ, the working frequency is higher than 1000HZ, and the working frequency is actually far higher than the commercial power frequency in the technology, and the frequency used by enterprises in the range of tens of kilohertz can be increased to the MHZ range when needed. The frequency of the current of the rotor and the stator of the motor is always different, and the difference between the frequency of the rotating speed induction and the excitation frequency always exists in the number of poles, so that the frequency is called as difference frequency.

In order to achieve the purpose, the invention adopts the technical scheme that: a difference frequency type high-frequency motor comprises a stator, a rotor, a stator coil, a rotor coil and a transmission shaft, wherein the transmission shaft is positioned on a central axis of the difference frequency type high-frequency motor, the stator coil, the rotor and the rotor coil are distributed on the outer side of the transmission shaft, the difference frequency type high-frequency motor also comprises a high-frequency excitation generator, the high-frequency excitation generator is connected to the rotor coil, 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 to the rotor coil.

The technical scheme of further improvement in the technical scheme is as follows:

1. in the above scheme, after the high-frequency excitation current is introduced into the rotor coil, a high-speed rotating magnetic field is generated, when a high-frequency current is introduced into the stator coil, and a frequency difference or a phase difference exists between the stator and the rotor, the transmission shaft outputs a torque and a rotating speed, and at the moment, the difference frequency type high-frequency motor realizes a motor function.

2. In the above scheme, after the high-frequency exciting current is introduced into the rotor coil, a high-speed rotating magnetic field is generated, a power source is input to the transmission shaft, the stator coil outputs high-frequency current, and at the moment, the difference frequency type high-frequency motor realizes the function of a generator.

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

4. In the above solution, when the stator coil frequency is higher than the rotor coil frequency, the rotor rotation direction is the same as the high-speed rotation magnetic field direction; when the frequency of the stator coil is lower than that of the rotor coil, the rotation direction of the rotor is opposite to that of the high-speed rotating magnetic field, and the rotation speed and the rotation direction can be adjusted by adjusting the frequency of the rotor coil.

5. In the scheme, the stator coil is connected with a two-phase or three-phase current with the same frequency as the rotor coil, and the transmission shaft generates rotating speed and torque by adjusting the phase of the stator coil and the rotor coil.

6. In the above scheme, the stator phase always leads the rotor, so that the rotor always accelerates in the same direction of the rotating magnetic field, and the torque can be adjusted by adjusting the phase. On the contrary, the stator phase can always lag behind the rotor, and the rotor always accelerates in the opposite direction of the rotating magnetic field. Through the closed-loop automatic control of the position sensor and the speed sensor, the torque of the motor, namely the rotating speed and the rotating direction can be adjusted according to the load

7. In the above-mentioned solution, a plurality of stator windings are provided in the difference frequency type high frequency motor, and the corresponding stator coils are made to output a plurality of high frequency currents by changing the connection mode of the rotor coils.

8. In the above solution, the connection mode includes the following four cases except for changing the number of the magnetic pole pairs:

1) the excitation direction of the high-frequency excitation generator is the same as the direction of the transmission shaft, the rotation direction of the rotating magnetic field of the generator rotor is the same as the rotation direction of the transmission shaft, and the output frequency of the generator is the same as the input frequency of the high-frequency excitation generator;

2) when the excitation direction of the high-frequency excitation generator is the same as the direction of the transmission shaft, and the rotating direction of the rotating magnetic field of the main rotor of the generator is opposite to the rotating direction of the transmission shaft, the output frequency of the generator is lower than that of the input side of the high-frequency excitation generator;

3) the excitation direction of the high-frequency excitation generator is opposite to the direction of the transmission shaft, and the rotating direction of the rotating magnetic field of the main rotor of the generator is the same as the rotating direction of the transmission shaft, so that the output frequency of the generator is higher than the input side of the high-frequency excitation generator;

4) when the excitation direction of the high-frequency excitation generator is opposite to the direction of the transmission shaft, and the rotating direction of the rotating magnetic field of the main rotor of the generator is opposite to the rotating direction of the transmission shaft, the output frequency of the generator is the same as the input frequency of the high-frequency excitation generator.

9. In the above scheme, the generators obtained by the coupling modes 1) and 4) are co-frequency generators.

10. In the above scheme, the stator and the rotor core are made of silicon steel sheets or ferrite cores.

11. In the above scheme, the structural form of the high-frequency motor includes the following:

1) the diameter of the excitation generator is much smaller than that of the stator, and a rotor excitation coil is communicated with a rotor coil through a lead;

2) the stator core of the rotor excitation generator is the same in diameter as the main stator core and divided into two sections, only the axial thickness is different, the rotor core is also divided into two sections, the rotor is similar to a squirrel-cage rotor of a power frequency motor, and the middle wire connecting part can be used as a cooling fan. The structure is simple, and the manufacturing process difficulty is low;

3) the excitation and power supply adopts a slip ring and an electric brush to be communicated with a rotor excitation coil, and the structure of the motor is basically the same as that of the existing wound-rotor motor, but the number of turns is small.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the difference frequency type high-frequency motor uses high-frequency input current, so that the manufacturing cost of the motor is greatly reduced, and the volume is reduced; especially, the speed regulator is used for driving automobiles or ships, thereby facilitating power transmission and speed regulation; the motor has wide application prospect, can save a large amount of cost, save energy and reduce consumption no matter the motor is manufactured or a user, can generate good economic benefit, and can also obtain good social benefit.

2. The difference frequency type high-frequency motor of the invention inputs different high-frequency currents on the stator side and the rotor side, and takes the difference frequency as the basis of the rotating speed of the motor, thereby achieving the effect of reducing the volume of the motor, and possibly reducing the cost of the motor by more than eight times in the field of high-power high-frequency motors.

3. The difference frequency type high-frequency motor can output high-frequency high-power current on the stator side by inputting high-frequency current on the rotor side and matching with the input of a mechanical power source, and is equivalent to a high-frequency power amplifier.

Drawings

Fig. 1 is a first structural schematic diagram of a high frequency motor according to the present invention.

Fig. 2 is a schematic view of a second structure of the high frequency motor of the present invention.

Fig. 3 is a schematic diagram of a wave power generation application structure of the high-frequency motor of the invention.

In the figure: 1. a high-frequency excitation generator; 2. a stator coil; 3. a rotor coil; 4. a drive shaft; 5. a bearing; 6. a stator core; 7. a rotor core; 8. fixing the pile; 9. a transmission slide bar; 10. a gravity float.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

The invention is further described below with reference to the following examples:

a difference frequency type high-frequency motor comprises a stator, a rotor, a stator coil 2, a rotor coil 3 and a transmission shaft 4, wherein the transmission shaft 4 is positioned on an axial line in the difference frequency type high-frequency motor, and the stator, the stator coil 2, the rotor and the rotor coil 3 are distributed on the outer side of the transmission shaft 4.

Example 1: when used as a high-frequency motor:

a difference frequency type high-frequency motor also comprises a high-frequency excitation generator 1, wherein the high-frequency excitation generator 1 is connected to a rotor coil 3, two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator 1, the output high-frequency excitation current is input to the rotor coil 3, so that the rotor generates a high-speed rotating magnetic field, and two-phase or three-phase current higher or lower than excitation frequency is introduced into a stator coil, so that the stator generates a rotating magnetic field with the same rotating direction as the rotor;

when the frequency of the stator is higher than that of the rotor, the rotor rotates towards the same direction of the rotating magnetic field direction, the rotor outputs a rotating speed which is in the difference of the two frequencies, and the rotating speed is positively correlated with the difference of the two frequencies;

on the contrary, when the stator frequency is lower than the rotor frequency, the rotor rotation direction is opposite to the high-frequency rotation magnetic field direction, the rotor outputs a rotation speed in the difference of the two frequencies, and the rotation speed is positively correlated with the difference of the two frequencies and is also inversely correlated with the magnetic pole pair number of the motor;

the rotor outputs torque, so that the function of the motor that electric energy is converted into mechanical energy is completed, and the function of the motor is completed. The frequency of the excitation side can be adjusted, the rotating speed can be smoothly adjusted, the steering can be adjusted, and the power required by the excitation side is not large.

When the frequencies of the two are the same, the rotating speed of the rotor is zero; the high frequency motor is made to generate torque by changing the phase difference between the rotor and the stator, and the high frequency motor is also made smaller in size. The principle is as follows: high-frequency currents with the same frequency are introduced into a stator coil 2 and a rotor coil 3 of the high-frequency motor, and the high-frequency current phases of rotor excitation and a stator are adjusted by using a position sensor and a speed sensor which are installed on the rotor, so that torque is generated. If the stator phase always leads the rotor through the position sensor, the rotor is always in an acceleration state towards the same direction of the rotating magnetic field, and the torque can be adjusted by adjusting the phase. On the contrary, the stator phase can always lag behind the rotor, and the rotor always accelerates in the opposite direction of the rotating magnetic field. The motor torque, namely the rotating speed and the rotating direction can be changed by adjusting the phase according to the load through the closed-loop automatic control of the position sensor and the speed sensor; the motor is operated by generating the required rotating speed and torque, which is similar to the operating principle of brushless DC motor and vector control. The difference between the motor and the motor based on the difference frequency as the rotating speed base is that the rotor current always works at a pure high frequency, and because the same frequency is adopted, the theoretically applicable frequency can be higher

However, because the motor which works by using the same-frequency phase modulation and high frequency is adopted, if the servo system fails and the protection system is not perfect, the servo system does not respond in time, the probability of stalling is very high, and the possibility of using the motor in the form of the motor in some occasions is limited.

The frequency of the current input by the stator coil and the rotor coil in the high-frequency motor is more than 1000 HZ.

Example 2: when the high-frequency generator is used:

a difference frequency type high-frequency motor also comprises a high-frequency excitation generator 1, wherein the high-frequency excitation generator 1 is connected to a rotor coil 3, 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, so that a high-speed rotating magnetic field is generated by a rotor, and meanwhile, a power source is connected to a transmission shaft to provide mechanical energy for the rotor;

if the excitation rotating magnetic field is opposite to the rotation direction of the rotor, the rotor coil cuts the magnetic line of force to generate current, and then the frequency of the excitation frequency plus the rotor rotating speed is generated in the rotor coil. As long as the direction of field rotation of the excitation generator is the same as the direction of the rotating field generated by the rotor corresponding to the stator, an electromotive force having the same frequency as the excitation input is generated on the stator output side (also related to the number of pole pairs of the stator coil and the rotor coil). Thereby realizing a generator function of converting mechanical energy into electrical energy.

By changing the coupling of the rotor coils, the output frequency of the stator coils can be changed: the specific connection forms include the following:

1) the excitation direction of the excitation generator is the same as the direction of the transmission shaft, the rotating direction of the rotating magnetic field of the generator rotor is the same as the rotating direction of the shaft, and the output frequency of the generator is the same as the applied frequency of the excitation generator.

Namely: fr ═ fc

In the formula: fc is the output frequency and fr is the exciter generator input frequency (the same applies below).

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

Namely: fc-fr-2 fz

In the formula: fz is the frequency of the axis rotation (for simplicity, the number of pole pairs is set to 1).

3) The excitation direction of the excitation generator is opposite to the direction of the transmission shaft, and the rotating direction of the rotating magnetic field of the rotor of the generator is the same as the rotating direction of the shaft, the output frequency of the generator is higher than that of the input side of the excitation generator.

Namely: fc +2fz (generators with squirrel-cage rotors belong to this category).

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

Namely: fr (connection mode suitable for a generator or an on-frequency generator).

The generators obtained by the coupling modes 1) and 4) are same-frequency generators.

Example 3: when the high-frequency generator and the high-frequency motor are used in combination:

a difference frequency type high-frequency motor also comprises a high-frequency excitation generator 1, wherein the high-frequency excitation generator 1 is connected to a rotor coil 3, two-phase or three-phase low-power high-frequency current is input to the high-frequency excitation generator 1, the output high-frequency excitation current is input to the rotor coil 3, so that a high-speed rotating magnetic field is generated by a rotor, a power source is connected to a transmission shaft at the same time, mechanical energy is provided for the rotor, and the high-frequency motor realizes the function of a generator; the high-frequency generator is provided with two groups of stator windings, and two groups of stator coils output two or more than two generators with different frequency potentials due to different connection modes of rotor coils;

the two high-frequency currents are respectively led into the stator coil and the rotor coil side of the motor, and the function of the motor is realized.

The structure combines the generator and the motor for use, realizes the input of high-frequency currents with different frequencies of the motor, and can be applied to various fields such as automobiles and the like.

The high-frequency motor and the high-frequency generator can adopt the following structures:

as shown in fig. 1, 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, the rotor coil 3 is wound on the rotor core 6, the rotor excitation coil of the high-frequency excitation generator 1 is connected with the rotor coil 3 by a conducting wire, and a bearing 5 is arranged at the position where the transmission shaft 4 is connected with the casing.

As shown in fig. 2, the stator core of the high-frequency excitation generator 1 and the stator core 6 have the same diameter and are divided into two sections, only the axial thickness is different, the rotor core 7 is also divided into two sections, the rotor is similar to a squirrel-cage rotor of a power-frequency motor, and the middle wire connecting part can be used as a cooling fan. The structure is simple, and the manufacturing process difficulty is low.

3. The third structural form of the induction excitation type high-frequency motor: the excitation and power supply adopts a slip ring and an electric brush to be communicated with a rotor excitation coil, and the structure of the motor is basically the same as that of the existing wound-rotor motor, but the number of turns is small.

The above-mentioned aspects of the invention are further explained as follows:

1. the generator and the motor are used as electromagnetic power conversion equipment, the higher the frequency is under the same current, the fewer the excitation turns of the same magnetic field intensity required by an electric appliance coil with electromagnetic property is, the higher the use frequency is, the fewer the materials required by the motor are, the smaller the volume is, the copper loss is accompanied, the efficiency is improved, the motor only needs to adjust the frequency of the excitation side when adjusting the rotating speed, the smaller the power required to be adjusted is, and the cost is conveniently reduced.

2. The high-frequency generator can also be used as a high-power long-wave (KHZ) and short-wave (MHZ) high-frequency power amplifier (same-frequency generator), as long as the rotor coils are properly connected, the rotating magnetic field direction of the excitation generator and the rotating magnetic field direction generated by main excitation are exchanged, and because the shaft end magnetic field frequency is complementary with the shaft rotating speed, the output frequency is highly consistent with the excitation frequency and is irrelevant to the rotating speed.

3. The medium-frequency power generator can be used as a medium-frequency power generator for material processing (medium-frequency quenching).

4. Besides general application, the same-frequency generator adopting the technology can be used as a high-frequency power amplifier, and an application channel is provided for a high-power high-frequency generator required by a special application field.

5. In ships for remote power transmission. The technology can miniaturize the volumes of the high-frequency high-power generator and the motor, and is convenient for speed regulation and direction regulation, so that the fuel engine of the ship can be arranged at any convenient position without being limited by the traditional mechanical transmission device with heavy volume.

6. In the automobile manufacturing industry, the cost can be reduced, meanwhile, full electric control and stepless speed change can be realized, the engine can be enabled to work in a high-efficiency region all the time through the automatic control device, the fuel efficiency of an automobile is improved, and the transportation benefit is improved due to the miniaturization of the power transmission volume.

7. In the production links (such as industries of papermaking, packaging and the like) needing speed linkage, a high-frequency generator can be used for supplying power, the frequency is uniformly adjusted on the generator side, the rotating speed of a production line is further adjusted, accurate adjustment is realized, and the equipment purchase cost can be reduced.

8. Because the same-frequency generator can basically ignore the rotating speed, the rotating speed is only related to the power, the generator is particularly suitable for a water turbine generator set and a wind energy generator with low rotating speed, the cost can be greatly reduced, the excitation side can adopt commercial power, only the rotor is correctly connected, the output frequency of the generator set and the excitation frequency are the same, the generator set is in the same-frequency generator state, and the impact on a power grid during grid-connected operation can be basically eliminated during operation.

9. Because the cost of the high-power difference frequency type high-frequency motor is greatly reduced, the purchase of a speed change device can be saved in many occasions, and the high-power difference frequency type high-frequency motor is replaced by a small speed change device such as an electronic frequency conversion device.

10. The high-frequency generator adopting the squirrel-cage rotor has the advantages of simplified manufacturing process, more reliable work and reduced maintenance burden.

11. As the same frequency generator in the form of a power amplifier has higher excitation frequency and good applicability to a mechanical low-speed power source, the same frequency generator can be theoretically applied to sea wave power generation, as shown in figure 3, a fixing pile 8 is arranged on the sea surface to fix the high frequency generator above the sea surface, the high frequency generator is connected to a transmission slide rod 9, a gravity floater 10 is arranged at the bottom of the transmission slide rod 9, the gravity floater 10 is positioned on the sea surface and fluctuates with sea waves, the output frequency is not influenced by the movement speed after the windings of the same frequency generator are properly connected, as long as high frequency current is input at proper time, the movement direction of an excitation magnetic field is opposite to the external power, the linear or swing high frequency generator becomes the same frequency generator, and the problems of low movement speed and large change of the sea waves and difficult.

12. As long as the working frequency of the high-frequency motor exceeds the audio frequency range (more than 20 KHZ), the noise of the motor is greatly reduced, and the working environment is more friendly.

It must be noted that, in order to prevent the rotor and stator currents of the motor from being added simultaneously or the rotor speed from being overspeed in a fault state, corresponding protective measures are taken to prevent the occurrence of a runaway accident. However, when the single closed loop structure is used in a single generator corresponding to a single motor, the single closed loop structure is easy to overcome technically and basically does not become a problem. The excitation of the generator needs current-limiting measures such as a reactor or a capacitor and the like to prevent the excitation current from being overlarge. In addition, when the high-frequency operation is carried out, the number of the magnetic poles is more than 2, otherwise, high temperature can be generated due to the influence of leakage flux on the metal shaft.

The difference frequency type high-frequency motor can greatly save the manufacturing cost of the motor. If the technology is generally adopted, the cost of the manufacturing industry and the use units of the motor is greatly saved, the good effects of reducing consumption and protecting environment are achieved, and good social benefits can be achieved while considerable economic benefits are created for enterprises.

Due to the difficulty of frequency control and current control, the technology is limited to transportation tools in the initial application stage, for example, a generator of an automobile, a ship, an airplane and the like corresponds to a single closed loop structure of a motor, and the technology can be applied to other fields after the technology is accumulated to be mature.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. A difference frequency type high-frequency motor comprises a stator, a rotor, a stator coil (2), a rotor coil (3) and a transmission shaft (4), wherein the transmission shaft (4) is positioned on a central axis of the difference frequency type high-frequency motor, and the stator, the stator coil (2), the rotor and the rotor coil (3) are distributed outside the transmission shaft (4), and the difference frequency type high-frequency motor is characterized in that: the high-frequency excitation generator is characterized by further comprising a high-frequency excitation generator (1), wherein the high-frequency excitation generator (1) is connected to the rotor coil (3), 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 difference frequency type high frequency motor according to claim 1, characterized in that: after the high-frequency excitation current is introduced into the rotor coil (3), a high-speed rotating magnetic field is generated, the stator coil (2) is introduced with a high-frequency current, and when the stator and the rotor have frequency difference or phase difference, the transmission shaft (4) outputs torque and rotating speed, and at the moment, the difference frequency type high-frequency motor realizes the function of a motor.

3. The difference frequency type high frequency motor according to claim 1, characterized in that: after the high-frequency exciting current is introduced into the rotor coil (3), a high-speed rotating magnetic field is generated, a power source is input to the transmission shaft (4), the stator coil (2) outputs high-frequency current, and the difference frequency type high-frequency motor realizes the function of a generator.

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

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

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

7. The difference frequency type high frequency motor according to claim 6, characterized in that: when the phase of the stator is ahead of the rotor, the rotor always accelerates towards the same direction of the rotating magnetic field, and the torque can be adjusted by adjusting the phase; on the contrary, the stator phase lags behind the rotor, and the rotor is always in an acceleration state towards the reverse direction of the rotating magnetic field.

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

9. The difference frequency type high frequency motor according to claim 8, characterized in that: the coupling mode includes the following four cases:

1) the excitation direction of the high-frequency excitation generator (1) is the same as that of the transmission shaft (4), the rotating direction of the rotating magnetic field of the generator rotor is the same as that of the transmission shaft (4), and 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 the direction of the transmission shaft (4), and the rotating direction of the rotating magnetic field of the main rotor of the generator is opposite to the rotating direction of the transmission shaft (4), the output frequency of the generator is lower than that of the input side of the high-frequency excitation generator (1);

3) the excitation direction of the high-frequency excitation generator (1) is opposite to the direction of the transmission shaft (4), and the rotating direction of the rotating magnetic field of the main rotor of the generator is the same as the rotating direction of the transmission shaft (4), so that the output frequency of the generator 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 rotating direction of the rotating magnetic field of the main rotor of the generator is opposite to the rotating direction 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).

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

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