High-efficiency generator set with low rotating speed, high torque and small back electromotive force

Abstract

The utility model provides a high-efficiency generator set with low rotating speed, high torque and small back electromotive force, which comprises an input end, a frequency converter, a motor, a coupler, a power generation device and a load end, the rotating speed n of the motor is 46r / min-300r / min, the torque T is equal to 9550P / n, the power generation device comprises a stator, a rotor, a first winding and a second winding, the stator is provided with a plurality of wire slots, and the first winding is connected with the second winding. The first winding is located outside relative to the second winding, the first winding and the second winding are mutually insulated, the first winding is connected with an input end, the second winding is connected with a load end, a permanent magnet is arranged on the rotor, the frequency converter is arranged between the input end and the motor, and the motor is connected with the power generation device through a coupler; the low-rotating-speed and high-torque motor is adopted to assist the power generation device to generate power, so that electric energy output by the generator set is more stable and efficient, the generator set is particularly suitable for occasions where natural resources such as wind energy and water energy are utilized to generate power, and integrated utilization of various natural resources can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of generator sets, in particular to a high-efficiency generator set with low rotation speed, high torque and small back electromotive force. Background Art

[0002] The traditional permanent magnet generator includes a stator winding and a rotor. When it is working, the rotor of the generator is driven to rotate by an external power. When the rotor rotates, its built-in permanent magnet will cut the magnetic lines of force passing through the stator winding, thereby generating an induced current in the winding, which is then transmitted to the outside to achieve the power generation function. Among them, the stator winding will also generate a back electromotive force in the process of outputting current, and the back electromotive force will hinder the rotation of the rotor of the generator, so the externally applied power is required to exceed this resistance in order to continue to rotate and generate electricity. The patent with application number 2024204783550 previously applied by the applicant discloses a permanent magnet generator with an internal motor traction function and the patent with application number 202420567834X discloses a permanent magnet synchronous reluctance dual-winding electric generator integrated machine, which can play a coupling role through dual windings, balance the output, and reduce the obstruction of the back electromotive force to improve the output efficiency of the generator. Now the inventor further proposes a generator set with higher efficiency and more stable output on this basis. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a high-efficiency generator set with low speed, high torque and small back electromotive force.

[0004] The technical solution adopted by the utility model is as follows: The present application provides a high-efficiency generator set with low speed, high torque and small back electromotive force, including an input end and a load end, and also includes: a motor, the speed n of the motor is 46r / min-300r / min, the torque T=9550P / n, where P is the power of the motor; a power generation device, the power generation device includes a stator, a rotor, a first winding and a second winding, a plurality of wire slots are evenly arranged on the stator along the circumferential direction, the first winding and the second winding are wound in the wire slots, the first winding is located on the outside relative to the second winding, the first winding and the second winding are insulated from each other, the first winding is connected to the input end, and the second winding is connected to the load end, a plurality of mounting parts are evenly arranged on the rotor along the circumferential direction, the mounting parts penetrate the rotor along the axial direction, and a permanent magnet is arranged in the mounting parts; a frequency converter, the frequency converter is arranged between the input end and the motor, and is used to enable the motor to obtain a larger starting torque; and a coupling, the coupling is used to connect the output shaft of the motor to the rotor of the power generation device.

[0005] In some embodiments, a reactive power compensator is further included, and the reactive power compensator is arranged between the power generation device and the load end.

[0006] In some embodiments, a heat dissipation device is also included, and the heat dissipation device is used to dissipate heat for the power generation device.

[0007] In some embodiments, the wire diameter of the coil in the second winding is 1.5-5 times the wire diameter of the coil in the first winding.

[0008] In some embodiments, the first winding and the second winding are insulated from each other by a mica sheet.

[0009] In some embodiments, the permanent magnet includes permanent magnet units whose number is a multiple of four, and every four permanent magnet units are arranged in a Halbach array to form a magnetic force enhancement side and a magnetic force weakening side, and the magnetic force enhancement side faces the stator.

[0010] In some embodiments, the stator is formed by coaxially stacking a plurality of stator plates, and the rotor is formed by coaxially stacking a plurality of rotor plates.

[0011] In some embodiments, the inverter is a heavy-load vector inverter.

[0012] The beneficial effects of the present invention are as follows: the present invention adopts a low-speed, high-torque electric motor to assist the generator to generate electricity, so that the electric energy output by the generator set is more stable and efficient, which is particularly suitable for occasions where natural resources such as wind energy and hydropower are used for power generation, and can realize the integrated utilization of multiple natural resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0014] Figure 1 It is a schematic diagram of a medium and high efficiency generator set of the utility model;

[0015] Figure 2 It is a schematic diagram of the power generation device in the utility model;

[0016] Figure 3 It is a schematic diagram of the permanent magnet in the utility model. DETAILED DESCRIPTION

[0017] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0018] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0019] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0020] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0021] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0023] Embodiment 1:

[0024] When conventional generators use natural resources such as wind energy and hydropower to generate electricity, the input of such power sources is unstable, resulting in poor quality and unstable output of the power output of the generator. Figures 1 to 3 As shown, this embodiment provides a high-efficiency generator set with low speed, high torque and small back electromotive force, including an input end and a load end 1, the input end is preferably connected to a stable power source, such as a mains power supply, and also includes:

[0025] Motor 2, in this embodiment, needs to keep the motor in a low speed and high torque state. In this state, the back electromotive force of motor 2 is relatively small. Preferably, the speed n of motor 2 is 46r / min-300r / min, and the torque T=9550P / n, where P is the power of motor 2;

[0026] The power generation device 3 is an improvement on a permanent magnet generator with an internal motor traction function disclosed in the patent application number 2024204783550 previously applied by the applicant and a permanent magnet synchronous reluctance double-winding electric generator disclosed in the patent application number 202420567834X, so as to adapt to the low speed and high torque operating state of the generator set.

[0027] like Figure 2 As shown, the power generation device 3 includes a stator 31, a rotor 32, a first winding 33 and a second winding 34. The stator 31 is evenly provided with a plurality of wire slots 310 along the circumferential direction. The first winding 33 and the second winding 34 are wound in the wire slots 310. The first winding 33 is located outside the second winding 34. The first winding 33 and the second winding 34 are insulated from each other. The first winding 33 is connected to the input end, and the second winding 34 is connected to the load end 1. The rotor 32 is evenly provided with a plurality of mounting portions 320 along the circumferential direction. The mounting portions 320 penetrate the rotor 32 in the axial direction, and a permanent magnet 35 is arranged in the mounting portion 320. The magnetic field generated by the dual windings acts on a rotor 32. Since the dual windings act as a mutual coupling and balanced output, the generation of back electromotive force on the stator 31 can also be reduced. In particular, when the rotor 32 rotates using natural resources such as wind energy and hydropower, the input of such power sources may be unstable, resulting in poor quality of electric energy output from the second winding 34. Therefore, an external power supply is connected to the first winding 33 to ensure the stability of the rotation of the rotor 32, thereby ensuring continuous and high-quality output of electric energy. The first winding 33 can be powered by an external photovoltaic panel assembly or connected to the input end to achieve the integrated utilization of multiple natural resources, making the output of electric energy more stable and efficient.

[0028] In order to further improve the power generation efficiency of the power generation device 3, the permanent magnet 36 includes permanent magnet units 361 whose number is a multiple of four, and every four permanent magnet units 361 are arranged in a Halbach array to form a magnetic force enhancement side and a magnetic force weakening side, and the magnetic force enhancement side faces the stator 31. Specifically, Figure 3As shown, the N poles of each of the four permanent magnet units 361 are arranged in the manner of upper right and lower left, so that a magnetic force enhancement side can be formed on the upper side of the permanent magnet 36 and a magnetic force weakening side can be formed on the lower side of the permanent magnet 36, and the magnetic force enhancement side faces the stator 31. In this embodiment, four permanent magnet units 361 are combined. This combination can make the magnetic force on one side of the permanent magnet 36 stronger and the magnetic force on the other side weaker, reducing the size of the permanent magnet 36, thereby reducing the generation of eddy currents inside the permanent magnet 36, preventing demagnetization caused by overheating of the magnet, and further improving the output efficiency. Among them, the arrangement in the manner of upper right and lower left is the Halbach array. Due to this arrangement and combination, the same level phases are concentrated on the upper side of the permanent magnet 36, the magnetic field area is expanded, and the magnetic field is superimposed, so that the magnetic force will be enhanced, while the two poles are alternated on the lower side of the permanent magnet 36, and the magnetic force will be weakened.

[0029] Secondly, the wire diameter of the coil in the second winding is 1.5-5 times the wire diameter of the coil in the first winding.

[0030] Secondly, the stator 31 is formed by coaxially stacking a number of stator sheets, and the rotor 32 is formed by coaxially stacking a number of rotor sheets. By using the stator 31 and the rotor 32 formed by stacking thin sheets, the eddy current loss in the magnetic circuit can be effectively reduced. Specifically, the eddy current loss is generated by electromagnetic induction in the electromagnet core, which increases with the increase of the core thickness. By dividing the core into thinner sheets, this loss can be significantly reduced, thereby improving the efficiency of the motor. Secondly, the amount of material can be controlled more effectively, which helps to reduce the weight of the product and reduce the manufacturing cost.

[0031] The first winding 33 and the second winding 34 are insulated from each other by a mica sheet 36. Mica has excellent electrical insulation and heat resistance. Of course, other electrical insulation materials, such as polytetrafluoroethylene, epoxy resin, etc., can also be used.

[0032] The inverter 4 is arranged between the input terminal and the motor 2. The inverter 4 adopts a heavy-load vector inverter to enable the motor 2 to obtain a larger starting torque and maintain low speed operation. The speed n is 46r / min-300r / min. The heavy-load vector inverter can change the speed of the motor by adjusting the output frequency. At the same time, by adjusting the output voltage, the torque of the motor can be changed. The voltage and frequency can be automatically adjusted according to the load size, so that the motor can run in the best state under different load conditions, thereby improving the efficiency of the motor.

[0033] And a coupling 5, wherein the coupling 5 is used to connect the output shaft of the motor 2 with the rotor 32 of the generator 3, and a direct connection is performed through the coupling 5, thereby reducing transmission loss and improving transmission efficiency.

[0034] Furthermore, a reactive compensator is included, which is arranged between the power generation device 3 and the load end 1. The role of the reactive compensator in the electronic power supply system is to improve the power factor of the power grid, reduce the loss of the transmission line, improve the power supply efficiency, and improve the power supply environment.

[0035] Furthermore, it also includes a heat dissipation device 6, which is used to dissipate heat for the power generation device 3. The heat dissipation device 6 can adopt air cooling, water cooling or mixed cooling. In this embodiment, the air cooling heat sink is preferably installed corresponding to the power generation device 3.

[0036] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0037] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0038] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A high-efficiency generator set with low speed, high torque and small back electromotive force, comprising an input end and a load end, characterized in that: Also includes: An electric motor, wherein the speed n of the electric motor is 46 r / min-300 r / min, and the torque T=9550 P / n, wherein P is the power of the electric motor; A power generation device, comprising a stator, a rotor, a first winding and a second winding, wherein a plurality of wire slots are evenly arranged on the stator along the circumferential direction, the first winding and the second winding are wound in the wire slots, the first winding is located outside the second winding, the first winding and the second winding are insulated from each other, the first winding is connected to an input end, the second winding is connected to a load end, a plurality of mounting parts are evenly arranged on the rotor along the circumferential direction, the mounting parts penetrate the rotor along the axial direction, and a permanent magnet is arranged in the mounting parts; A frequency converter, which is arranged between the input terminal and the motor and is used to enable the motor to obtain a larger starting torque; and a coupling for connecting the output shaft of the motor with the rotor of the generator.

2. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: It also includes a reactive power compensator, which is arranged between the power generation device and the load end.

3. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: It also includes a heat dissipation device, which is used to dissipate heat for the power generation device.

4. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: The wire diameter of the coil in the second winding is 1.5-5 times the wire diameter of the coil in the first winding.

5. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: The first winding and the second winding are insulated from each other by a mica sheet.

6. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: The permanent magnet includes permanent magnet units whose number is a multiple of four, and every four permanent magnet units are arranged in a Halbach array to form a magnetic force enhancement side and a magnetic force weakening side, and the magnetic force enhancement side faces the stator.

7. A high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: The stator is formed by coaxially stacking a plurality of stator sheets, and the rotor is formed by coaxially stacking a plurality of rotor sheets.

8. The high-efficiency generator set with low speed, high torque and small back electromotive force according to claim 1, characterized in that: The frequency converter adopts a heavy-load vector frequency converter.

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