WO2015014247A1

WO2015014247A1 - Asynchronous connection motor

Info

Publication number: WO2015014247A1
Application number: PCT/CN2014/083017
Authority: WO
Inventors: 胡云龙
Original assignee: 威海戥同测试设备有限公司
Priority date: 2013-08-01
Filing date: 2014-07-25
Publication date: 2015-02-05
Also published as: CN103986278B; CN103986278A

Abstract

An asynchronous connection motor, which solves the technical problem that the existing hydraulic coupler has large volume, heavy weight, large mechanical loss and slip loss, lower efficiency, instable speed control, low power factors, poor speed adjustment accuracy and high maintenance costs. The asynchronous connection motor comprises a main motor which operates at a power frequency, and an auxiliary motor which operates at a variable frequency, wherein a planetary gear mechanism is connected between the main motor and the auxiliary motor; the planetary gear mechanism is provided with a planet carrier; and the planet carrier is fixedly connected to an output shaft. The asynchronous connection motor can be used for driving a motor or wind power generation.

Description

Dissimilar motor

Technical field

The invention relates to a motor, in particular to a dissimilar motor which integrates a power frequency motor and a planetary gear mechanism for a variable frequency motor.

Background technique

The fluid coupling is a non-rigid coupling that uses liquid as the working medium. It changes the output speed and torque by changing the working chamber fullness (usually adjusted by the conduit) with the input speed constant. Hydraulic couplers are widely used in high-power fans and transportation machinery.

The output shaft of the motor is coupled to the input shaft of the fluid coupling, and the output shaft of the fluid coupling is coupled to the driven load. When in use, the motor starts with no load, then the current and torque are changed from small to large. The output shaft of the hydraulic coupler drives the high-power fan to start gradually into the working condition, ensuring the safe start of the high-power fan and reducing the motor. Power consumption at startup. During the working process, the stepless and smooth speed regulation can also be carried out. When the load is too large and the gear is stopped, the input shaft of the fluid coupling can still rotate, and the motor will not be damaged.

However, the hydraulic coupler has technical defects such as large volume, heavy weight, large mechanical loss and slip loss, low efficiency, unstable speed control, low power factor, poor speed regulation, and high maintenance cost. Therefore, the above-mentioned technical drawback exists in the drive mechanism of the motor-coupled fluid coupling.

In order to overcome the above-mentioned defects of the fluid coupling, the inverter is used to directly drive the motor, and the output shaft of the motor is connected to the load. This solution can achieve the purpose of soft start and stepless smooth speed regulation, but the inverter must always be in the working process. The power-on working state, and in addition to the highest efficiency of the motor running at the rated frequency (ie, power frequency), the motor operates at low frequencies with low efficiency, which is not conducive to energy saving. What is more noteworthy is that high-power inverters are expensive and costly.

In the wind power generation system, the wind turbine includes two modes of operation, one is a constant speed constant frequency operation mode, and the other is a variable speed constant frequency operation mode. In the constant speed constant frequency operation mode, the generator's rotation speed is constant, thus ensuring a constant frequency consistent with the grid frequency, which has low wind energy utilization rate, low efficiency, need reactive power compensation device, and uncontrollable output power. . Therefore, the variable-speed constant-frequency operation mode is applied more and more widely. In the variable-speed constant-frequency operation mode, the rotational speed of the generator set can vary with the wind speed, and the generator set is regulated by the phase frequency of the rotor excitation current to make the stator-side output constant frequency. Constant piezoelectric energy, high wind energy conversion rate and high efficiency.

At present, the generator sets that realize the variable-speed constant-frequency operation mode mainly have double-fed asynchronous generator sets, especially in the megawatt-class wind power system. The doubly-fed asynchronous generator set is equipped with a gearbox with a high speed-increasing ratio as a transmission component. A full-power inverter, which is bulky and heavy, increases the complexity and cost of the wind power system, and has high maintenance costs. The sequential connection between the impeller main shaft of the wind power generation system and the input shaft of the gear box, coupling, and doubly-fed asynchronous generator set requires accurate alignment, otherwise it will cause vibration, the bearing is subjected to large lateral force, and the bearing is damaged. greatly increase. For example, the engineering cost of replacing a 1.5MW gearbox is 800,000 yuan, and the gearbox price is 1.2 million yuan, so the gearbox costs are very high. As the fan capacity increases, the gearbox and the doubly-fed asynchronous generator are also getting larger and larger, and the manufacturing process is more and more difficult, the machining accuracy is difficult to guarantee, and the cost is getting higher and higher. Regarding the current price of the motor, the price of a 3MW doubly-fed asynchronous generator is higher than the price of two 1.5MW motors.

technical problem

The present invention is to solve the above technical problems or at least one of the above problems, and provides a small size, light weight, low maintenance and low cost, capable of stepless and smooth speed regulation, wide speed regulation range, high precision, high efficiency, and energy saving. Union motor.

Technical solution

The technical solution of the present invention comprises a main motor operating at a power frequency and an auxiliary motor working in a variable frequency. a planetary gear mechanism is coupled between the main motor and the auxiliary motor, and the planetary gear mechanism is provided with a carrier and a carrier. The output shaft is fixedly connected.

According to a further preferred technical solution of the present invention, a clutch is provided, and the main motor and the auxiliary motor are respectively provided with a rotor, and the clutch can fix the rotor of the main motor or the auxiliary motor.

Beneficial effect

The invention has the beneficial effects that the essence of the invention is that the power frequency motor and the planetary gear mechanism of the variable frequency motor are integrally coupled, and one power frequency motor is used as the main motor, and one frequency conversion motor controlled by the frequency converter is used as the auxiliary motor. The two motors are designed concentrically inside and outside, or parallel in parallel, and the power of the motor is transmitted to the output shaft through the planetary gear mechanism, and the output shaft is fixedly connected with the planet carrier of the planetary gear mechanism. The main motor running at the power frequency can be started at no load. At this time, the output shaft of the present invention does not rotate, that is, the idle start of the present invention is started, and the start-time is independent of the external load, and the zero-torque and zero-speed output for a long time is realized. When the output shaft of the present invention is coupled to the large load impeller, the invention is unloaded after the power is turned on, and the load impeller is not rotated, and the same no-load starting effect of the motor coupling fluid coupling is achieved. In the process of the large load impeller from the start to the gradual acceleration to the required speed of the working condition, the mechanical force generated by the resistance of the large load impeller can enable the auxiliary motor to generate electricity and feed back to the grid through the frequency converter, thereby realizing the role of saving the energy of the grid to save energy. When the output shaft of the present invention is connected to the large load impeller for normal operation, the impeller is stuck, that is, when the stall occurs, the main motor of the present invention rotates normally without stopping the machine and is not damaged. According to the actual working conditions, when the auxiliary motor needs to work, the invention is subjected to the stepless and steady speed regulation under the control of the frequency converter, and only a part of the power can be used to realize the speed regulation, and the speed regulation range is wide and the precision is high.

In addition, the invention has the advantages of small volume, light weight, convenient maintenance and low cost, and is beneficial to energy saving and consumption reduction. The invention can completely replace the fluid coupling, and does not require the hydraulic coupler and the reducer as a buffer twisting mechanism between the motor and the working machine, and represents a new technical trend.

For the application of wind power generation, compared with the existing double-fed asynchronous generator set, the gear box and the coupling are omitted, only one gear box is needed, the intermediate link is small, the maintenance amount is greatly reduced, thereby reducing the weight of the wind power generator set. , reducing manufacturing, transportation costs and lifting costs, and greatly reducing the load on the tower.

For example, for a 3MW double-fed asynchronous generator (price of about 300,000) plus a 3MW inverter (price 200,000-300,000), the price is very high, and the invention only needs two 1.5MW motor (about 100,000) and a 1.5MW inverter (price is about 100,000), its price is relatively low.

The transmission loss is small, the power generation efficiency is high; the efficiency is high at low wind speed; the cut-in wind speed value is smaller, and the use of variable speed operation makes the use of a wider wind range, ensuring that the fan operates more at the optimum tip speed ratio and captures wind energy to the maximum extent. Wind energy utilization is higher.

DRAWINGS

1A is a schematic structural view of a first embodiment of the present invention;

1B is a schematic structural view of a second embodiment of the present invention;

2 is a comparison diagram of the loss curve of the main motor of the present invention under no-load starting and the loss of the general motor no-load starting.

The symbols in the figure indicate:

1. outer motor rotor; 2. outer motor stator; 3. inner motor stator; 4. inner motor rotor; 5. inner and outer stator frame; 6. rear support bearing; 7. outer cover; 8. outer clutch; 10. Planet carrier; 11. Output shaft; 12. Sun gear; 13. Support bearing; 14. Rotary shaft; 15. Front support bearing; 16. Upper motor; 17. Lower motor; 18. Sun gear; ; 20. double-ring gear; 21. output shaft; 22. clutch; 23. planetary gear; 24. inner clutch; 25. planetary gear; 26. shaft; 27. shaft; 28. upper clutch; 30. Gear; n. No-load speed.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention

First embodiment

The dissimilar motor shown in FIG. 1A is used as a motor, and includes one inner motor and one outer motor. The inner motor includes an inner motor rotor 4 and an inner motor stator 3. The outer motor includes an outer motor rotor 1 and an outer motor. Stator 2. The inner motor rotor 4 is mounted in the inner and outer stator frame 5, and the inner motor rotor 4 is provided with a rotating shaft 14, which protrudes from both ends of the inner and outer stator frames 5 and is supported by the inner and outer stator frames 5 through the rear support bearing 6 and the front support bearing 15. . The inner motor stator 3 is mounted on the inner wall of the inner and outer stator frame 5. The outer motor is an outer rotor motor, the outer motor stator 2 is mounted on the outer wall of the inner and outer stator frame 5, the outer motor rotor 1 is supported on the inner and outer stator frame 5 via the support bearing 13, and the support bearing 13 is sleeved at the front end bearing of the inner and outer stator frame 5. Block.

The inner motor and the outer motor share the same rotating shaft, that is, the rotating shaft 14, and the rotating shaft 14 is connected to the planetary gear mechanism. The planetary gear mechanism includes a sun gear 12, a carrier 10, a planetary gear 23, and an inner ring gear 9. The rotating shaft 14 is coupled to the sun gear 12, and the output shaft 11 is fixedly coupled to the carrier 10. The ring gear 9 is coupled to the outer motor rotor 1.

The inner ring gear 9 is coupled to the outer clutch 8, and the outer clutch 8 can fix the inner ring gear 9. The inner clutch 24 fixes the rotating shaft 14 of the inner motor.

A cover 7 is attached to the inner and outer stator frames 5 to protect the internal components of the entire mechanism.

The two motors of the inner motor and the outer motor can be arranged in this way, one of which is a motor working at a power frequency, as a main motor, and the other is a variable frequency motor controlled by a frequency converter as an auxiliary motor.

The following describes the working process of the entire device:

In the first case, the inner motor is a power frequency motor, which runs at a constant speed under the power frequency, and the outer motor is a variable frequency motor, and the inverter of the peripheral controls its operation. The output shaft 11 can be coupled to a large load impeller or other large load.

1. The inner motor runs at the power frequency, and the outer motor runs in the opposite direction under the control of the inverter. The rotating shaft 14 drives the sun gear 12 to rotate under the driving of the inner motor, and the inner ring gear 9 rotates under the driving of the outer motor and the rotating direction is opposite to the rotating direction of the sun gear 12, so that the carrier 10 may rotate or may not rotate. In order to prevent the planetary carrier from rotating, that is, the output shaft 11 does not rotate, it is necessary to adjust the rotational speed of the inner ring gear 9, because in this process, the rotational speed ratio of the planetary gear mechanism and the rotational speed of the rotating shaft 14 are both quantitative, and the inner ring gear 9 The speed is the only variable.

Therefore, the inverter is used to control the external motor to rotate at a certain rotation speed, that is, the inner ring gear 9 is rotated at a certain rotation speed, and the rotation direction of the outer motor is opposite to the rotation of the inner motor, so that the rotation shaft 11 does not rotate. The significance of the non-rotation of the rotating shaft 11 is that the internal motor running at the power frequency is started without load, that is, the present invention is started without load. When the output shaft 11 of the present invention is coupled to a large load impeller, the present invention is idling after power-on, and the load impeller is not rotated, achieving the same no-load starting effect of the motor-coupled fluid coupling, and the present invention is idling-started. The process is zero torque and zero speed output, and can maintain this state for a long time, and its own start is independent of the load.

After the no-load start of the present invention is completed, when the large-load impeller needs to be accelerated from the start to the gradual acceleration to the required speed of the working condition, in the process, the external motor is gradually decelerated by the inverter, and the sun gear 12 gradually transmits the torque to the planetary gear. 23, the planet carrier 10 gradually drives the large load impeller to rotate through the output shaft 11 to the required speed of the working condition. In this process, the external motor is generated by the resistance, and the mechanical energy generated by the resistance can be fed back to the grid through the frequency converter, thereby realizing the role of saving the energy of the grid.

When the output shaft 11 of the present invention is coupled to the large load impeller for normal operation, the impeller is stuck, that is, when the stall occurs, the present invention realizes long-time large torque and zero-speed output, and hardly consumes power, and is within the present invention. The motor rotates normally without blocking or damage.

Generally, the loss of the motor under no-load operation is about one-third of its rated power, and the loss of the motor coupled to the fluid coupling at the no-load start is also large, which is a waste of power for the grid. However, in the process of starting the no-load start of the present invention, since the rotating shaft 14 of the inner motor is coupled to the outer motor rotor 1 of the outer motor through the planetary gear mechanism, a part of the mechanical energy output from the inner motor is transmitted to the outer motor to drive the external motor to generate electricity, and the outer motor The generated electricity can be fed back to the grid. The energy transfer in this process is the conversion of the grid energy into the mechanical energy of the internal motor. The mechanical energy of the internal motor is converted into electric energy by the external motor and fed back to the grid, thus realizing the recovery of the grid power. Grid power. The energy saving effect that the motor coupling hydraulic coupler does not have is realized. As shown in Fig. 2, the ordinate indicates the motor loss, the abscissa indicates the motor speed, and n indicates the motor no-load speed. The upper curve in the figure indicates the loss curve of the general motor no-load start. The thinner curve below shows the present. The loss curve of the no-load start of the motor in the invention can be clearly seen from the figure, and the power saving effect of the invention is obtained.

2. When the inner motor runs at the power frequency and the outer motor does not operate, the rotating shaft 14 drives the sun gear 12 to rotate, the inner ring gear 9 is fixed, and the carrier 10 rotates in the same direction, thereby driving the output shaft 11 to rotate in the same direction. In the case where the internal motor speed is constant, the rotational speed of the output shaft 11 depends on the rotational speed ratio of the planetary gear mechanism.

The outer clutch 8 fixes the outer motor rotor 1 or the inner ring gear 9 of the outer motor.

3. The inner motor runs at the power frequency, and the outer motor runs in the same direction under the control of the frequency converter. The rotating shaft 14 drives the sun gear 12 to rotate under the driving of the inner motor, and the inner ring gear 9 rotates under the driving of the outer motor and the rotating direction is the same as the rotating direction of the sun gear 12, so that the carrier 10 also rotates in the same direction, thereby driving the output shaft. 11 also rotates in the same direction. The rotational speed of the output shaft 11 depends on the rotational speed ratio of the planetary gear mechanism and the rotational speed of the inner ring gear 9. Since the rotational speed ratio of the planetary gear mechanism is quantitative, the rotational speed of the inner ring gear 9 can be changed to adjust the rotational speed of the output shaft 11, and finally The speed regulation of the output shaft 11 by the frequency converter is used.

In the second case, the external motor is a power frequency motor, which runs at a constant speed under the power frequency. The inner motor is a variable frequency motor and is controlled by the inverter of the peripheral. The output shaft 11 can be coupled to a fan impeller.

1. When the external motor runs at the power frequency and the inner motor does not operate, the sun gear 12 is fixed, the inner ring gear 9 drives the carrier 10 to rotate, and the carrier 10 drives the output shaft 11 to rotate in the same direction. In the case where the external motor speed is constant, the rotational speed of the output shaft 11 depends on the rotational speed ratio of the planetary gear mechanism. The inner clutch 24 fixes the rotating shaft 14 of the inner motor, thereby realizing the fixing of the sun gear 12.

2. The external motor runs at the power frequency, and the inner motor runs in the same direction under the control of the inverter. The inner ring gear 9 is driven by the outer motor, and the rotating shaft 14 drives the sun gear 12 to rotate under the driving of the inner motor, and the rotating direction is the same as the rotating direction of the inner ring gear 9, so that the carrier 10 also rotates in the same direction, thereby driving the output. The shaft 11 also rotates in the same direction. The rotation speed of the output shaft 11 depends on the rotation speed ratio of the planetary gear mechanism and the rotation speed of the sun gear 12. Since the rotation speed ratio of the planetary gear mechanism is quantitative, the rotation speed of the sun gear 12 can be changed to adjust the rotation speed of the output shaft 11, and finally the use is achieved. The speed regulation of the inverter on the output shaft 11.

3. The external motor runs at the power frequency, and the inner motor runs in the opposite direction under the control of the inverter. The inner ring gear 9 is driven by the external motor, and the rotating shaft 14 drives the sun gear 12 to rotate under the driving of the inner motor, and the rotating direction is opposite to the rotating direction of the inner ring gear 9. Thus, the carrier 10 may rotate or may not rotate. . In order to prevent the carrier 10 from rotating, that is, the output shaft 11 does not rotate, it is necessary to adjust the rotational speed of the sun gear 12, because in this process, the rotational speed ratio of the planetary gear mechanism and the rotational speed of the inner ring gear 9 are both quantitative, the sun gear The speed of 12 is the only variable.

Therefore, the inverter can be used to control the internal motor to rotate at a certain speed, and the direction is opposite to the steering of the external motor, so that the output shaft 11 can be prevented from rotating. The significance of the non-rotation of the output shaft 11 is that the external motor operating at the power frequency is started without load, that is, the idle start of the present invention. When the output shaft 11 of the present invention is coupled to a large load impeller, the present invention is unloaded after power-on, and the load impeller is not rotated, achieving the same no-load starting effect of the motor-coupled fluid coupling. When the output shaft 11 of the present invention is coupled to the large load impeller for normal operation, the impeller is stuck, that is, when the stall occurs, the outer motor of the present invention rotates normally and does not block.

In terms of speed regulation and saving grid power, it is the same as the first case described above, except that the internal motor is used for power generation.

Second embodiment

[01] Referring to FIG. 1B, the dissimilar motor is used as a motor, which includes an upper motor 16, a lower motor 17, and a planetary gear mechanism including a sun gear 18, a carrier 19, a planetary gear 25, and a double ring gear 20 The rotating shaft 26 of the upper motor 16 is coupled to the sun gear 18, and the output shaft 21 is fixedly coupled to the carrier 19. The rotating shaft 27 of the lower motor 17 is coupled to the double ring gear 20 via a gear 30. The upper clutch 28 and the lower clutch 29 are used to fix the rotating shafts of the upper motor 16 and the lower motor 17, respectively.

[02] The upper motor 16 and the lower motor 17 are longitudinally arranged in the above manner, which is different from the concentric design arrangement of the first embodiment. They can be set up such that one of them is a motor operating at a power frequency, as a main motor, and the other is a variable frequency motor controlled by a frequency converter as an auxiliary motor.

The following describes the working process of the entire device:

The mode of operation of this embodiment is basically the same as that of the first embodiment, except that the upper clutch 28 is fixed to the rotating shaft 26 of the motor 16, thereby realizing the fixing of the sun gear 18. The upper clutch 29 fixes the rotating shaft 27 of the lower motor 17 to achieve the fixing of the double ring gear 20. In order to realize the rotation of the sun gear 18 and the double ring gear 20 in the same direction, the upper motor 16 and the lower motor 17 must be rotated in the opposite direction, in order to achieve the reverse rotation of the sun gear 18 and the double ring gear 20, the upper motor 16 and the lower The motor 17 must be rotated in the same direction.

The principle of the first embodiment is the same in terms of no-load starting, speed regulation, and saving of grid power, that is, the auxiliary motor is used for power generation.

The variable frequency motor described in the above specific first embodiment and second embodiment refers to a motor that can be driven by a frequency converter. The variable frequency motor can adopt the principle of double feed motor to further reduce the power of the frequency converter.

Third embodiment

Before describing the present embodiment, it should be explained that in the wind power generation system, since the wind energy is proportional to the cube of the wind speed, when the wind speed is varied within a certain range, if the windmill is allowed to perform the shifting motion, the purpose of better utilizing the wind energy can be achieved. . For large-scale wind power generation systems, under the rated wind speed conditions of the 7-stage wind, the generator can run at full capacity to achieve the highest efficiency, and the working conditions below the 5th-level wind can not reach full-load operation, failing to achieve the highest efficiency.

The dissimilar motor shown in Fig. 1A is used as a generator and is used in a wind power generation system, and both the inner motor and the outer motor are generators. The difference between the structure of this embodiment and the first embodiment is that the inverter can only be connected to the external motor, and the internal motor cannot be connected to the inverter. The frequency converter in this embodiment is a four-quadrant frequency converter, which can realize energy feedback back to the power grid. The inverter may be an inverter device such as a converter that can generate electric power different from the grid voltage and frequency from the external motor and rectify and invert the inverter into electric power having the same voltage and frequency as the grid.

The internal motor is a constant speed constant frequency generator, which can be a three-phase asynchronous generator.

The outer motor preferably uses an outer rotor permanent magnet synchronous generator, and the outer rotor is a permanent magnet outer rotor such as ferrite or neodymium iron boron.

The following describes the working process of the entire device:

The output shaft 11 is coupled to the wind turbine of the wind power generation system, the stator windings of the inner motor stator 3 are connected to the grid, and the stator windings of the outer motor stator 2 are connected to the grid through a four-quadrant frequency converter.

When the wind force is above 7 or higher, the outer motor rotor 1 or the ring gear 9 of the outer motor is fixed by the outer clutch 8. The wind wheel drives the planet carrier 10 to rotate, thereby driving the planetary gear 23 to rotate, the planetary gear 23 is an active member, the sun gear 12 is a follower, and the rotation of the sun gear 12 drives the rotating shaft 14 to rotate, so that the inner motor rotor 4 rotates at a rated speed. The motor stator 3 emits the same electrical energy as the grid voltage and frequency and delivers it to the grid. At this time, the inner motor runs at full load, that is, the alien motor runs at full load.

When the wind is above level 7, there is another case where the outer clutch 8 does not operate, that is, the outer motor rotor 1 or the ring gear 9 of the outer motor is not fixed. The wind wheel drives the planet carrier 10 to rotate, thereby driving the planetary gear 23 to rotate, the planetary gear 23 is an active member, the sun gear 12 and the inner ring gear 9 are driven members, and the rotation of the sun gear 12 drives the rotating shaft 14 to rotate, so that the inner motor rotor 4 Rotating at the rated speed, the inner motor stator 3 emits the same electrical energy as the grid voltage and frequency and delivers it to the grid. The inner ring gear 9 drives the outer motor rotor 1 to rotate, and the outer motor stator 2 generates electric energy and sends it to the four-quadrant frequency converter. The four-quadrant frequency converter outputs the electric energy with the same grid voltage and frequency after rectifying and inverting the received electric energy. Grid.

When the wind is below 5, the wind wheel rotates at a lower speed, and the rotating shaft 14 is fixed by the inner clutch 24, that is, the fixed inner motor rotor 4 does not move. At this time, the wind wheel drives the planet carrier 10 to rotate, thereby driving the planetary gear 23 to rotate, the planetary gear 23 is an active member, the inner ring gear 9 is a driven member, the inner ring gear 9 drives the outer motor rotor 1 to rotate, and the outer motor stator 2 emits The electric energy is transmitted to the four-quadrant frequency converter, and the four-quadrant frequency converter outputs the electric energy with the same voltage and frequency of the grid to the power grid after rectifying and inverting the received electric energy.

Fourth embodiment

The dissimilar motor shown in Fig. 1B, which is used as a generator, is used in a wind power generation system, and the upper motor 16 and the lower motor 17 are both generators. The difference between the structure of this embodiment and the second embodiment is that the inverter can only be connected to the lower motor 17, and the upper motor 16 cannot be connected to the inverter. The frequency converter in this embodiment is a four-quadrant frequency converter, which can realize energy feedback back to the power grid. The inverter may be an inverter device such as a converter that can generate electric power different from the grid voltage and frequency from the external motor and rectify and invert the inverter into electric power having the same voltage and frequency as the grid.

The upper motor 16 is a constant speed constant frequency generator and may be a three-phase asynchronous generator.

The lower motor 17 preferably uses an inner rotor permanent magnet synchronous generator, and the inner rotor is a permanent magnet inner rotor such as ferrite or neodymium iron boron.

The following describes the working process of the entire device:

The output shaft 21 is coupled to the wind turbine of the wind power generation system, the stator winding of the upper motor 16 is connected to the grid, and the stator winding of the lower motor 17 is connected to the grid via a four-quadrant frequency converter.

When the wind force is above 7 or higher, the lower shaft 27 of the lower motor 17 is fixed by the lower clutch 29, thereby fixing the double ring gear 20. The wind wheel drives the planet carrier 19 to rotate, thereby driving the planetary gear 25 to rotate, the planetary gear 25 is the active member, the sun gear 18 is the driven member, and the rotation of the sun gear 18 drives the rotating shaft 26 to rotate, so that the upper motor 16 rotates at the rated speed, and the upper motor The stator of 16 emits the same electrical energy as the grid voltage and frequency and delivers it to the grid. At this time, the upper motor 16 is operated at full load, that is, the asynchronous motor is running at full load.

When the wind is above 7 or higher, there is another case where the lower clutch 29 does not operate, that is, the rotating shaft 27 of the lower motor 17 is not fixed, and the wind wheel drives the carrier 19 to rotate, thereby driving the planetary gear 25 to rotate, and the planetary gear 25 is The driving member, the sun gear 18 and the double gear ring 20 are driven members, and the rotation of the sun gear 18 drives the rotating shaft 26 to rotate, so that the upper motor 16 rotates at a rated speed, and the stator of the upper motor 16 emits the same electric energy as the grid voltage and frequency. Delivered to the grid. The ring gear 20 drives the rotor of the lower motor 17 through the gear 30, and the stator of the lower motor 17 sends power to the four-quadrant inverter. The four-quadrant inverter rectifies and inverts the output and the grid voltage after receiving the electric energy. The same frequency of electricity is supplied to the grid.

When the wind is below 5, the wind wheel rotates at a lower speed, and the rotating shaft 26 is fixed by the upper clutch 28, that is, the fixed sun gear 18 does not move. At this time, the wind wheel drives the planet carrier 19 to rotate, thereby driving the planetary gear 25 to rotate, the planetary gear 25 is the active member, the double gear ring 20 is the driven member, and the double gear ring 20 drives the rotor rotation of the lower motor 17 through the gear 30. The stator of the lower motor 17 sends electric energy and is sent to the four-quadrant frequency converter. The four-quadrant frequency converter outputs the same electric energy and voltage to the grid after rectifying and inverting the received electric energy.

The above description is only for the preferred embodiment of the invention, and is not intended to limit the invention, and various modifications and changes can be made to the invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the claims of the present invention are intended to be within the scope of the present invention.

Industrial applicability

Claims

An alien motor, comprising: a main motor operating at a power frequency and an auxiliary motor working in a variable frequency, wherein a planetary gear mechanism is coupled between the main motor and the auxiliary motor, the planet The gear mechanism is provided with a planet carrier to which the output shaft is fixedly coupled.
The dissimilar electric machine according to claim 1, further comprising a clutch, wherein the main motor and the auxiliary motor are respectively provided with a rotor capable of fixing a rotor of the main motor or the auxiliary motor.
The dissimilar electric machine according to claim 2, wherein:

The main motor is an inner rotor motor, which includes an inner motor rotor and an inner motor stator, and the inner motor rotor is provided with a rotating shaft;

The auxiliary motor is an outer rotor motor, which includes an outer motor rotor and an outer motor stator;

An inner and outer stator frame is further disposed, the inner motor rotor is disposed in the inner and outer stator frame, and a rotating shaft of the inner motor rotor extends from both ends of the inner and outer stator frame and is supported by the rear support bearing and the front support bearing The inner motor stator is disposed on an inner wall of the inner and outer stator frame, the outer motor stator is disposed on an outer wall of the inner and outer stator frame; and the outer motor rotor is supported by the support bearing The inner and outer stator frames, the support bearing sleeve is disposed at a front end bearing stop of the inner and outer stator frame;

The planetary gear mechanism is provided with a sun gear, a planetary gear, an inner ring gear, a rotating shaft of the inner motor rotor is coupled with the sun gear, and the inner ring gear is coupled with the outer motor rotor;

The clutch includes an outer clutch and an inner clutch, the inner ring gear is coupled with an outer clutch, and a rotating shaft of the inner motor rotor is coupled with an inner clutch.
The dissimilar electric machine according to claim 2, wherein:

The main motor is an outer rotor motor, which includes an outer motor rotor and an outer motor stator;

The auxiliary motor is an inner rotor motor including an inner motor rotor and an inner motor stator, and the inner motor rotor is provided with a rotating shaft;

An inner and outer stator frame is further disposed, the inner motor rotor is disposed in the inner and outer stator frame, and a rotating shaft of the inner motor rotor extends from both ends of the inner and outer stator frame and is supported by the rear support bearing and the front support bearing The inner motor stator is disposed on an inner wall of the inner and outer stator frame, the outer motor stator is disposed on an outer wall of the inner and outer stator frame; and the outer motor rotor is supported by the support bearing The inner and outer stator frames, the support bearing sleeve is disposed at a front end bearing stop of the inner and outer stator frame;

The planetary gear mechanism is provided with a sun gear, a planetary gear, an inner ring gear, a rotating shaft of the inner motor rotor is coupled with the sun gear, and the inner ring gear is coupled with the outer motor rotor;

The clutch includes an outer clutch and an inner clutch, the inner ring gear is coupled with an outer clutch, and a rotating shaft of the inner motor rotor is coupled with an inner clutch.
The dissimilar electric machine according to claim 2, wherein:

The main motor is an upper motor, and the upper motor is provided with a rotating shaft;

The auxiliary motor is a lower motor, and the lower motor is provided with a rotating shaft;

The planetary gear mechanism is provided with a sun gear, a planetary gear, a double ring gear, and a rotating shaft of the upper motor is coupled to the sun gear; a rotating shaft of the lower motor is coupled to the double ring gear through a gear;

The clutch includes an upper clutch and a lower clutch, and a rotating shaft of the upper motor is coupled with an upper clutch, and a rotating shaft of the lower motor is coupled with a lower clutch.
The dissimilar electric machine according to claim 2, wherein:

The main motor is a lower motor, and the lower motor is provided with a rotating shaft;

The auxiliary motor is an upper motor, and the upper motor is provided with a rotating shaft;

The planetary gear mechanism is provided with a sun gear, a planetary gear, a double ring gear, and a rotating shaft of the upper motor is coupled to the sun gear; a rotating shaft of the lower motor is coupled to the double ring gear through a gear;

The clutch includes an upper clutch and a lower clutch, and a rotating shaft of the upper motor is coupled with an upper clutch, and a rotating shaft of the lower motor is coupled with a lower clutch.
The dissimilar electric machine according to claim 3, wherein:

The inner rotor motor is a constant speed constant frequency generator, the outer rotor motor is an outer rotor permanent magnet synchronous generator, and the outer rotor permanent magnet synchronous generator is provided with a stator winding, the stator winding and the four quadrant frequency converter connection.
The dissimilar electric machine according to claim 7, wherein said constant speed constant frequency generator is a three-phase asynchronous generator.
The dissimilar electric machine according to claim 5, wherein:

The upper motor is a constant speed constant frequency generator, the lower motor is an inner rotor permanent magnet synchronous generator, and the inner rotor permanent magnet synchronous generator is provided with a stator winding, and the stator winding is connected with a four quadrant frequency converter.
The dissimilar electric machine according to claim 9, wherein said constant speed constant frequency generator is a three-phase asynchronous generator.