Dual-motor combination and inversion structure suitable for engine

Abstract

The utility model provides a dual-motor combination suitable for an engine, which comprises a first permanent magnet generator and a second permanent magnet generator which are fixed on the input and output ends of a crankshaft of the engine in a one-to-one correspondence manner, the number of branches of generators in the first permanent magnet generator and the second permanent magnet generator is 3N, N is a positive integer, and N is a positive integer. The three-phase windings of the 2N branches in the first permanent magnet generator are correspondingly superposed and output to obtain a first group of output power, the three-phase windings of the remaining N branches in the first permanent magnet generator are directly output to obtain a second group of output power, and the three-phase windings of the N branches in the second permanent magnet generator are directly output to obtain a third group of output power; and the three-phase windings of the remaining 2N branches in the second permanent magnet generator are correspondingly superposed and output to obtain a fourth group of output power. The utility model also provides an inversion structure which carries out rectification and inversion processing on four groups of output power to obtain three phases of equal power. The generator is connected to the input and output end of the engine crankshaft, so that the service life and the reliability of the crankshaft are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of generator, concretely relates to a double motor combination and inverter structure suitable for engine. BACKGROUND

[0002] Generators have a wide range of uses in industrial and agricultural production, national defense, science and technology, and daily life. There are many forms of generators, but their working principles are based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of their construction is to use appropriate magnetically permeable and conductive materials to form magnetic circuits and electric circuits that mutually induce each other to generate electromagnetic power, achieving the purpose of energy conversion.

[0003] Currently, the connecting of the engine crankshaft and the generator rotor on the market is through the spline on the rotor support directly connecting with the spline of the crankshaft, and fixed by a circlip. However, the present inventor has found through research that the existing engine only has a generator connected at the input end or the output end of the crankshaft. This structure will cause the input end and the output end of the crankshaft to be unbalanced. When the generator is running, the crankshaft end connected with the generator will vibrate with the generator, which can easily cause damage to the crankshaft and affect the service life and reliability of the crankshaft. SUMMARY

[0004] In view of the technical problem that the existing engine only has a generator connected at the input end or the output end of the crankshaft, which will cause the input end and the output end of the crankshaft to be unbalanced, and when the generator is running, the crankshaft end connected with the generator will vibrate with the generator, which can easily cause damage to the crankshaft and affect the service life and reliability of the crankshaft, the utility model provides a double motor combination suitable for engine.

[0005] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0006] A double motor combination suitable for engine, comprising a first permanent magnet generator and a second permanent magnet generator, the first permanent magnet generator and the second permanent magnet generator are fixed one by one at the input and output ends of the engine crankshaft, the number of branches of the generator in the first permanent magnet generator and the second permanent magnet generator is 3N, N is a positive integer, each branch includes U, V and W three-phase windings, the U, V and W three-phase windings of 2N branches in the first permanent magnet generator are one by one corresponding superimposed output to obtain the first group of output power, the U, V and W three-phase windings of the remaining N branches in the first permanent magnet generator are directly output to obtain the second group of output power, the U, V and W three-phase windings of N branches in the second permanent magnet generator are directly output to obtain the third group of output power, and the U, V and W three-phase windings of the remaining 2N branches in the second permanent magnet generator are one by one corresponding superimposed output to obtain the fourth group of output power.

[0007] Further, the N = 1.

[0008] The utility model further provides a kind of inverter structure suitable for dual-motor combination for engine, including preceding suitable for dual-motor combination for engine and three-phase inverter, the three-phase inverter includes the first processing unit for rectifying and inverting processing output first phase power to first group output power, the second processing unit for rectifying and then inverting processing output second phase power to the second group output power and third group output power respectively corresponding superposition, and the third processing unit for rectifying and inverting processing output third phase power to the fourth group output power, the first phase power, second phase power and third phase power are equal.

[0009] Further, the first processing unit, the second processing unit and the third processing unit include an AC-DC rectifying unit suitable for rectifying processing and a DC-AC inverting unit suitable for inverting processing.

[0010] Compared with the prior art, the dual-motor combination and inverter structure suitable for engine provided by the utility model are characterized in that the first permanent magnet generator and the second permanent magnet generator are fixed on the input and output ends of the engine crankshaft one by one, that is, when the first permanent magnet generator is fixed on the input end of the engine crankshaft, the second permanent magnet generator is fixed on the output end of the engine crankshaft, and that the U, V and W three-phase windings of 3N branch numbers of the generators in the first permanent magnet generator and the second permanent magnet generator are superposed to obtain four groups of output power, and the equal three-phase power is obtained after rectification and inversion by the three-phase inverter. In the application, the permanent magnet generators are connected to the input and output ends of the engine crankshaft, and the structure can balance the input and output ends of the crankshaft. When the generators are running, the balanced vibration of the generators at the input and output ends will not easily cause damage to the crankshaft, and the service life and reliability of the crankshaft are improved. Meanwhile, compared with the prior art in which one generator is connected to one end of the engine crankshaft to provide three-phase power, when the two permanent magnet generators are used to provide equal three-phase power, the size and weight of the two permanent magnet generators can be smaller, that is, the size and weight of the entire generator are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of the dual-motor combination and inverter structure suitable for engine provided by the utility model.

[0012] In the drawing, 1 is a first permanent magnet generator; 2 is a second permanent magnet generator; and 3 is a three-phase inverter. DETAILED DESCRIPTION

[0013] In order to make the technical means, creative features, purposes and effects achieved by the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0014] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0015] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0016] Please refer to Figure 1 As shown in the utility model provides a kind of double motor combination suitable for engine, including first permanent magnet generator 1 and second permanent magnet generator 2, first permanent magnet generator 1 and second permanent magnet generator 2 are fixed on the input and output end of engine crankshaft one by one, specifically when first permanent magnet generator 1 is fixed on the input end of engine crankshaft, second permanent magnet generator 2 is then fixed on the output end of engine crankshaft, the branch number of generator in first permanent magnet generator 1 and second permanent magnet generator 2 is 3N, N is positive integer, U, V, W three-phase winding is included in each branch, the U, V, W three-phase winding of 2N branch in first permanent magnet generator 1 is one by one corresponding superposition output and obtains first group output power, the U, V, W three-phase winding of remaining N branch in first permanent magnet generator 1 is directly output and obtains second group output power;The U, V, W three-phase winding of N branch in second permanent magnet generator 2 is directly output and obtains third group output power, the U, V, W three-phase winding of remaining 2N branch in second permanent magnet generator 2 is one by one corresponding superposition output and obtains fourth group output power. Adopt the double motor combination suitable for engine provided in the utility model, under the premise of providing equal three-phase power, compared with the prior art through a permanent magnet generator to realize, the volume and mass can be made smaller in the application by two permanent magnet generators, for example, to provide 20kW power, the design parameters of existing one permanent magnet generator are motor diameter 280mm, mass 30kg, the design parameters of two permanent magnet generators in the application are motor diameter 200mm, mass 10kg.

[0017] As a specific embodiment, please refer to Figure 1 As shown in the figure, N=1, that is, the number of branches of the generators in the first permanent magnet generator 1 and the second permanent magnet generator 2 is 3, which specifically includes A, B, C three branches, A branch includes U1, V1, W1 three-phase winding, B branch includes U2, V2, W2 three-phase winding, C branch includes U3, V3, W3 three-phase winding, U1, V1, W1 three-phase winding of A branch and U2, V2, W2 three-phase winding of B branch in the first permanent magnet generator 1 are one-to-one corresponding superposition (U1 and U2 are superposed, V1 and V2 are superposed, W1 and W2 are superposed) output to obtain the first group of output power, U3, V3, W3 three-phase winding of the remaining C branch in the first permanent magnet generator 1 is directly output to obtain the second group of output power; U1, V1, W1 three-phase winding of A branch in the second permanent magnet generator 2 is directly output to obtain the third group of output power, U2, V2, W2 three-phase winding of the remaining B branch and U3, V3, W3 three-phase winding of C branch in the second permanent magnet generator 2 are one-to-one corresponding superposition (U2 and U3 are superposed, V2 and V3 are superposed, W2 and W3 are superposed) output to obtain the fourth group of output power. Of course, based on the foregoing embodiment, those skilled in the art can also set the number of branches of the generators in the first permanent magnet generator 1 and the second permanent magnet generator 2 to 6, specifically, the three-phase windings of 4 branches in each permanent magnet generator are corresponding superposed to obtain a group of output power, and the three-phase windings of the remaining 2 branches in each permanent magnet generator are corresponding superposed to obtain a group of output power, which can also achieve the double motor combination effect of the foregoing embodiment.

[0018] Please refer to Figure 1 As shown in the figure, the utility model also provides a kind of inverter structure suitable for double motor combination of engine, including the double motor combination suitable for engine and three-phase inverter 3 of preceding description, three-phase inverter 3 includes the first processing unit for rectifying and inverting processing output first phase power (U phase) to the first group of output power, the second processing unit for corresponding superposition (direct current voltage positive and positive superposition, negative and negative superposition) after rectifying respectively to the second group of output power and third group of output power again inverting processing output second phase power (V phase), and the third processing unit for rectifying and inverting processing output third phase power (W phase) to the fourth group of output power, first phase power, second phase power and third phase power are equal.

[0019] As a specific embodiment, the first processing unit, the second processing unit and the third processing unit include AC-DC rectification units suitable for rectification processing and DC-AC inversion units suitable for inversion processing, that is, in the first processing unit, the second processing unit and the third processing unit, rectification processing is performed by the AC-DC rectification unit and inversion processing is performed by the DC-AC inversion unit, and the specific structure and working principle of the AC-DC rectification unit and the DC-AC inversion unit are well known to those skilled in the art as prior art, so they will not be described here.

[0020] Compared with the prior art, the double-motor combination and inverter structure suitable for engines provided by the utility model can correspondingly fix the first permanent magnet generator and the second permanent magnet generator on the input and output ends of the engine crankshaft, that is, when the first permanent magnet generator is fixed on the input end of the engine crankshaft, the second permanent magnet generator is correspondingly fixed on the output end of the engine crankshaft, and the 3N branch numbers of U, V and W three-phase windings of the generators in the first permanent magnet generator and the second permanent magnet generator are correspondingly superposed to obtain four groups of output power, and equal three-phase power is obtained after three-phase inverter rectification and inversion. The utility model connects the permanent magnet generators on the input and output ends of the engine crankshaft, and this structure can balance the input and output ends of the crankshaft, and when the generator is running, the balanced vibration of the generators on the input and output ends will not easily cause damage to the crankshaft, thereby improving the service life and reliability of the crankshaft. Meanwhile, compared with the prior art of connecting one generator on one end of the engine crankshaft to provide three-phase power, when the utility model provides equal three-phase power by two permanent magnet generators, the volume and mass of the two permanent magnet generators can be smaller, that is, the size and weight of the entire generator are effectively reduced.

[0021] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit it, and although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and they should all be covered in the scope of the claims of the utility model.

Claims

1. A dual motor combination suitable for an engine, characterized by, The application relates to a dual-motor combination for an engine, which comprises a first permanent magnet generator and a second permanent magnet generator, the first permanent magnet generator and the second permanent magnet generator are fixed on the input and output ends of an engine crankshaft one by one, the number of branch circuits of the generators in the first permanent magnet generator and the second permanent magnet generator is 3N, N is a positive integer, U, V and W three-phase windings are included in each branch circuit, the U, V and W three-phase windings of 2N branch circuits in the first permanent magnet generator are one by one superimposed to obtain a first group of output power, the U, V and W three-phase windings of the remaining N branch circuits in the first permanent magnet generator are directly output to obtain a second group of output power, the U, V and W three-phase windings of N branch circuits in the second permanent magnet generator are directly output to obtain a third group of output power, and the U, V and W three-phase windings of the remaining 2N branch circuits in the second permanent magnet generator are one by one superimposed to obtain a fourth group of output power.

2. The dual motor combination suitable for engine according to claim 1, characterized in that, The N=1.

3. An inverter structure suitable for a dual motor combination for an engine, characterized by, The application further relates to a three-phase inverter matched with the dual-motor combination for the engine, the three-phase inverter comprises a first processing unit for rectifying and inverting the first group of output power to output a first phase power, a second processing unit for rectifying the second group of output power and the third group of output power respectively, then superimposing and inverting to output a second phase power, and a third processing unit for rectifying and inverting the fourth group of output power to output a third phase power, the first phase power, the second phase power and the third phase power are equal.

4. The inverter structure suitable for a dual motor combination of an engine according to claim 3, characterized by The first processing unit, the second processing unit and the third processing unit comprise an AC-DC rectifying unit for rectifying and a DC-AC inverting unit for inverting.

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