A reversible shaft-belt synchronous generator capable of switching between power generation and electric modes

Abstract

The present invention discloses a reversible shaft-belt synchronous generator capable of switching between electric and electric modes of power generation, and relates to the technical field of generators. The generator comprises a generator base, a motor rotor and a generator shaft. The generator base is provided with a stator three-phase AC power supply terminal box, and the generator base is composed of a motor stator core, a stator three-phase winding, an exciter pole core and an exciter stator winding. The generator rotor is composed of a motor rotor core, a rotor winding, a rotor connecting piece, a rotating rectifier, an exciter rotor core, an exciter rotor three-phase winding and a conversion device arranged in sequence from front to back. The present invention realizes providing an excitation current to the motor rotor winding in the electric mode through the conversion device, so that the synchronous motor can realize self-starting, and reduces the axial size of the motor, saving space to the maximum extent, thereby effectively solving the problem that the shaft-belt synchronous generator cannot be used as a motor for self-starting.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a reversible shaft-belt synchronous generator capable of switching between power generation and electric modes. Background Art

[0002] In order to solve the problem that the current synchronous motor cannot be started directly, the commonly used synchronous motors that can realize PTO / PTH mode conversion are mainly permanent magnet synchronous generators or electrically excited synchronous generators + asynchronous starting motors.

[0003] It is difficult to adjust the magnetic field of a permanent magnet synchronous generator. Excessive temperature or low temperature will cause irreversible demagnetization, resulting in high cost and complicated installation process. The principle of the method of electrically excited synchronous generator + asynchronous starting motor is relatively simple, but the greater the power of the generator, the heavier the rotor weight, and the larger the asynchronous starting motor required, which greatly increases the size and weight of the unit. In addition, the connection between the generator and the asynchronous starting motor is mostly coaxial, which reduces the reliability of the coaxial rotor and is complicated to install. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a reversible shaft-belt synchronous generator capable of switching between power generation and electric modes, which effectively solves the problem that the shaft-belt synchronous generator cannot be self-started as an electric motor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A reversible shaft-belt synchronous generator capable of switching between power generation and electric modes, comprising a generator frame, a motor rotor and a generator shaft, wherein a stator three-phase AC power supply terminal box is arranged on the generator frame, and the generator frame is composed of a motor stator core, a stator three-phase winding, an exciter pole core and an exciter stator winding;

[0007] The generator rotor is composed of a motor rotor core, a rotor winding, a rotor connecting piece, a rotating rectifier, an exciter rotor core, an exciter rotor three-phase winding and a conversion device which are arranged in sequence from front to back, and an axial hole for a rotor lead wire is opened on the generator shaft.

[0008] As a preferred technical solution of the present invention, the lead wires of the stator three-phase winding are connected to the three-phase terminals in the stator three-phase AC power supply junction box on the generator frame.

[0009] As a preferred technical solution of the present invention, the positive and negative lead wires of the rotor winding are respectively connected to the positive and negative collector rings on the rotating rectifier through the rotor connecting plate, and the three-phase winding of the exciter rotor is connected to the three-phase connector of the rotating rectifier.

[0010] As a preferred technical solution of the present invention, an automatic voltage regulator is provided on one side of the stator winding of the exciter, and the positive and negative leads of the stator winding of the exciter are respectively connected to the positive and negative terminals of the excitation output power supply of the automatic voltage regulator.

[0011] As a preferred technical solution of the present invention, the positive and negative poles of the rotor connecting plate are connected to cables, and the conversion device has positive and negative slip rings. The two cables are respectively connected to the positive and negative slip rings of the conversion device through the shaft holes on the generator shaft.

[0012] As a preferred technical solution of the present invention, a junction box is further provided in the conversion device, and positive and negative pole terminals are provided in the junction box, and the positive and negative pole terminals are connected to a DC excitation power supply.

[0013] The beneficial effects of the present invention are:

[0014] When the stator of an ordinary synchronous motor is connected to a three-phase power supply, a rotating magnetic field is generated, and the rotor is in a stationary position. At this time, the synthetic torque of the rotor magnetic field is zero, and the motor cannot start. However, in the present invention, a conversion device is used to provide excitation current to the motor rotor winding in the electric mode, so that the synchronous motor can achieve self-starting, and the axial size of the motor is reduced, which saves space to the maximum extent, thereby effectively solving the problem that the shaft-belt synchronous generator cannot be self-started as an electric motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0016] Figure 1 It is a structural schematic diagram of the synchronous generator of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the synchronous generator rotor of the present invention.

[0018] In the figure: 1. Generator base; 2. Motor rotor; 3. Stator three-phase AC power supply terminal box; 4. Stator three-phase winding; 5. Exciter stator winding; 6. Rotor winding; 7. Rotor connecting plate; 8. Rotating rectifier; 9. Exciter rotor three-phase winding; 10. Conversion device; 11. Shaft hole; 12. Automatic voltage regulator; 13. Positive and negative slip rings; 14. Positive and negative terminal blocks. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example 1, reference Figure 1-2 , a reversible shaft-belt synchronous generator capable of switching between power generation and electric modes, comprising a generator frame 1, a motor rotor 2 and a generator shaft, a stator three-phase AC power terminal box 3 being arranged on the generator frame 1, the generator frame 1 being composed of a motor stator core, a stator three-phase winding 4, an exciter pole core and an exciter stator winding 5, the generator rotor 2 being composed of a motor rotor core, a rotor winding 6, a rotor connecting piece 7, a rotating rectifier 8, an exciter rotor core, an exciter rotor three-phase winding 9 and a conversion device 10 being arranged in sequence from front to back, and an axial hole 11 for a rotor lead-out wire being opened on the generator shaft;

[0021] Furthermore, the lead wires of the stator three-phase winding 4 are connected to the three-phase terminals in the stator three-phase AC power supply junction box 3 on the generator frame 1, the positive and negative lead wires of the rotor winding 6 are respectively connected to the positive and negative collector rings on the rotating rectifier 8 through the rotor connecting piece 7, the exciter rotor three-phase winding 9 is connected to the three-phase connector of the rotating rectifier 8, an automatic voltage regulator 12 is provided on one side of the exciter stator winding 5, the positive and negative leads of the exciter stator winding 5 are respectively connected to the positive and negative terminals of the excitation output power supply of the automatic voltage regulator 12, the positive and negative poles of the rotor connecting piece 7 are connected to the cable, the conversion device 10 has positive and negative slip rings 13, two cables are respectively connected to the positive and negative slip rings 13 of the conversion device 10 through the shaft hole 11 on the generator shaft, and the conversion device 10 is also provided with a junction box, and the junction box is provided with positive and negative terminal blocks 14, and the positive and negative terminal blocks 14 are connected to the DC excitation power supply;

[0022] During the implementation of this embodiment, when the stator of an ordinary synchronous motor is connected to a three-phase power supply, a rotating magnetic field is generated, and the rotor is in a stationary position. At this time, the synthetic torque of the rotor magnetic field is zero, and the motor cannot be started. In this embodiment, the conversion device 10 is used to provide excitation current to the motor rotor winding 6 in the electric mode, so that the synchronous motor can achieve self-starting, and the axial size of the motor is reduced, which saves space to the maximum extent, thereby effectively solving the problem that the shaft-belt synchronous generator cannot be self-started as an electric motor.

[0023] The switching method of the reversible shaft-belt synchronous generator that can realize the switching of the power generation and electric motor mode proposed in this embodiment includes the following steps:

[0024] Step 1: The lead wires of the stator three-phase winding 4 are connected to the three-phase terminals in the stator three-phase AC power supply junction box 3 on the generator frame 1, the positive and negative lead wires of the rotor winding 6 are respectively connected to the positive and negative collector rings on the rotating rectifier 8 through the rotor connecting piece 7, the exciter rotor three-phase winding 9 is connected to the three-phase connector of the rotating rectifier 8, the positive and negative lead wires of the exciter stator winding 5 are respectively connected to the excitation output power supply terminals of the automatic voltage regulator 12, the positive and negative connecting cables of the rotor connecting piece 7 are respectively connected to the positive and negative slip rings 13 of the conversion device 10 through the shaft hole 11, and the positive and negative terminal blocks 14 in the conversion device junction box are connected to the DC excitation power supply;

[0025] Step 2: Connect the three-phase terminals 3 in the stator three-phase AC power supply terminal box 3 on the generator frame 1 to the load, and the conversion device 10 performs the brush lifting action. At this time, the shaft-belt generator operates in the power generation mode;

[0026] Step 3: Connect the three-phase terminals 3 in the stator three-phase AC power supply terminal box 3 on the generator frame 1 to the three-phase AC excitation power supply, and the conversion device 10 performs the brush pressing action. At this time, the shaft belt generator runs in the electric mode.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reversible shaft-belt synchronous generator capable of switching between power generation and electric motor modes, comprising a generator frame (1), a motor rotor (2) and a generator shaft, characterized in that: The generator base (1) is provided with a stator three-phase AC power supply terminal box (3), and the generator base (1) is composed of a motor stator core, a stator three-phase winding (4), an exciter pole core and an exciter stator winding (5); The generator rotor (2) is composed of a motor rotor core, a rotor winding (6), a rotor connecting piece (7), a rotating rectifier (8), an exciter rotor core, an exciter rotor three-phase winding (9) and a conversion device (10) which are arranged in sequence from front to back, and an axial hole (11) for a rotor lead-out wire is provided on the generator shaft.

2. A reversible shaft-belt synchronous generator capable of switching between power generation and electric modes according to claim 1, characterized in that: The lead wires of the stator three-phase winding (4) are connected to the three-phase terminals in the stator three-phase AC power supply junction box (3) on the generator base (1).

3. A reversible shaft-belt synchronous generator capable of switching between power generation and motoring modes according to claim 1, characterized in that: The positive and negative lead wires of the rotor winding (6) are respectively connected to the positive and negative collector rings on the rotating rectifier (8) through the rotor connecting piece (7), and the exciter rotor three-phase winding (9) is connected to the three-phase connector of the rotating rectifier (8).

4. A reversible shaft-belt synchronous generator capable of switching between power generation and motoring modes according to claim 1, characterized in that: An automatic voltage regulator (12) is provided on one side of the exciter stator winding (5), and the positive and negative leads of the exciter stator winding (5) are respectively connected to the positive and negative terminals of the excitation output power supply of the automatic voltage regulator (12).

5. The reversible shaft-belt synchronous generator capable of switching between power generation and motoring modes according to claim 1, characterized in that: The positive and negative poles of the rotor connecting piece (7) are both connected to cables, and the conversion device (10) has positive and negative slip rings (13). The two cables are respectively connected to the positive and negative slip rings (13) of the conversion device (10) through shaft holes (11) on the generator shaft.

6. A reversible shaft-belt synchronous generator capable of switching between power generation and motoring modes according to claim 1, characterized in that: The conversion device (10) is also provided with a junction box, in which positive and negative pole wiring terminals (14) are provided, and the positive and negative pole wiring terminals (14) are connected to a DC excitation power supply.

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