A hybrid excitation machine based on an alternating pole layout

Abstract

A hybrid excitation machine based on an alternating pole layout, comprising a rotor and a stator, an air gap is arranged between the rotor and the stator, the rotor comprises a rotor core, and a magnetic pole is arranged on the outer side of the rotor core; the stator comprises a stator core, a plurality of partition portions are arranged on the inner side of the stator core, and an excitation coil is arranged between the partition portions. The technical problem to be solved by the utility model is to provide a hybrid excitation machine based on an alternating pole layout, which combines the advantages of excitation windings and permanent magnets, reduces the magnetic field loss of the excitation machine, and improves the efficiency of the whole system.

Description

Technical Field

[0001] This utility model relates to the field of generator excitation technology, and in particular to a hybrid exciter based on an alternating pole layout. Background Technology

[0002] Traditional synchronous generator excitation systems primarily rely on excitation windings to provide the required magnetic flux; however, this design has several limitations. Firstly, the excitation windings continuously consume electrical energy to maintain the magnetic flux, resulting in significant excitation losses. Secondly, traditional systems rely on rotor residual magnetism for starting, leading to insufficient starting reliability. Furthermore, the high self-inductance and mutual inductance of the excitation windings limit the system's dynamic response speed. Recently, the push for more efficient, reliable, and high-efficiency products has prompted consideration of excitation systems equipped with permanent magnet exciters and controlled rotary converters, but their proliferation is limited by their increased complexity and cost. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a hybrid exciter based on an alternating pole layout, which reduces the magnetic field loss of the exciter and improves the efficiency of the entire system by combining the advantages of excitation windings and permanent magnets.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a hybrid exciter based on alternating pole layout, including a rotor and a stator, with an air gap between the rotor and the stator. The rotor includes a rotor core, with magnetic poles on the outer side of the rotor core. The stator includes a stator core, with multiple partitions on the inner side of the stator core, and excitation coils are arranged between the partitions.

[0005] Preferably, a permanent magnet is provided between the partition and the stator core.

[0006] Preferably, the permanent magnet is a patch permanent magnet, which is attached to the inner side of the partition at intervals of one partition.

[0007] Preferably, the thickness of the permanent magnet is 1 mm.

[0008] Preferably, the outer side of the rotor core is provided with a magnetic pole slot, and the magnetic pole is embedded in the magnetic pole slot.

[0009] Preferably, the magnetic pole directions of adjacent magnetic poles differ by 120 degrees.

[0010] Preferably, the magnetic poles are provided with 36.

[0011] Preferably, the excitation coil has 12 coils.

[0012] Preferably, there are 6 permanent magnets.

[0013] Preferably, the rotor core, stator core, and partition are made of neodymium iron boron material.

[0014] This invention provides a hybrid exciter based on an alternating pole layout, which has the following advantages: 1. During steady-state operation, the permanent magnet provides the basic excitation flux, and the excitation winding is finely adjusted according to load changes; 2. Under dynamic operating conditions such as sudden load changes or power grid failures, the excitation winding quickly adjusts the magnetic flux to stabilize the generator output voltage and frequency; 3. Due to the increase in the equivalent air gap, the self-inductance and mutual inductance of the excitation winding are reduced, which improves the dynamic response speed of the system. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] like Figure 1 As shown, a hybrid exciter based on an alternating pole layout includes a rotor and a stator. An air gap 1 is provided between the rotor and the stator. The rotor includes a rotor core 2, and magnetic poles 3 are provided on the outer side of the rotor core 2. The stator includes a stator core 4, and multiple partitions 5 are provided on the inner side of the stator core 4. Excitation coils 6 are arranged between the partitions 5.

[0017] Preferably, a permanent magnet 7 is provided between the separator 5 and the stator core 4. The introduction of the permanent magnet and the excitation coil to form a "hybrid excitation" mode reduces the continuous power consumption of the excitation winding and significantly reduces the problem of high excitation loss in traditional excitation systems.

[0018] Preferably, the permanent magnet 7 is a patch permanent magnet, which is attached to the inner side of the partition 5 at intervals of 5. This forms an alternating pole layout, which can reduce the amount of permanent magnet used (eliminating the need for full pole surface mounting), reduce costs, and avoid the adjustment rigidity problem caused by excessive magnetic field concentration.

[0019] Preferably, the thickness of the permanent magnet 7 is 1mm. A thickness of 1mm avoids occupying too much air gap space, does not affect the magnetic permeability and excitation coil adjustment efficiency, and is also suitable for patch mounting, reducing magnetic leakage and improving magnetic field utilization.

[0020] Preferably, the outer side of the rotor core 2 is provided with a magnetic pole slot 8, and the magnetic pole 3 is embedded in the magnetic pole slot 8. The embedded structure improves the stability of the magnetic pole fixation, avoids the magnetic pole from loosening when the rotor rotates at high speed, and reduces the risk of failure.

[0021] Preferably, the magnetic pole directions of adjacent magnetic poles 3 differ by 120 degrees. This forms a symmetrical three-phase magnetic field (matching the 120-degree phase difference of the three-phase electricity), ensuring the symmetry and stability of the generator's output voltage and avoiding power generation quality problems caused by disordered magnetic pole directions in traditional methods.

[0022] Preferably, the magnetic poles 3 are provided with 36.

[0023] Preferably, the excitation coil 6 has 12 coils. The 36 magnetic poles and the subsequent 12 excitation coils form a "3 magnetic poles to 1 coil" matching relationship, which optimizes the number of pole pairs and the coordination of the windings, improves the smoothness of the magnetic field, and reduces hysteresis loss.

[0024] Preferably, there are 6 permanent magnets 7.

[0025] Preferably, the rotor core 2, stator core 4, and partition 5 are made of neodymium iron boron (NdFeB) material. NdFeB is a high-permeability material that improves the magnetic permeability of the core and partition, reduces hysteresis loss and eddy current loss, and has higher magnetic field conduction efficiency than traditional silicon steel sheets, thereby enhancing the magnetic field utilization rate of the permanent magnet and excitation coil.

[0026] This invention solves the problems of high losses, unreliable startup, slow dynamic response, and high cost of permanent magnet exciters in traditional excitation systems, effectively improving system efficiency and stability.

[0027] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A hybrid exciter based on an alternating pole configuration, characterized in that: The device includes a rotor and a stator, with an air gap (1) between the rotor and the stator. The rotor includes a rotor core (2) and magnetic poles (3) are provided on the outside of the rotor core (2). The stator includes a stator core (4) and multiple partitions (5) are provided on the inside of the stator core (4). Excitation coils (6) are provided between the partitions (5).

2. The hybrid exciter based on alternating pole configuration according to claim 1, characterized in that: A permanent magnet (7) is provided between the partition (5) and the stator core (4).

3. The hybrid exciter based on alternating pole configuration according to claim 2, characterized in that: The permanent magnet (7) is a patch permanent magnet, and is attached to the inside of the partition (5) at intervals of one partition (5).

4. A hybrid exciter based on an alternating pole configuration according to claim 2 or 3, characterized in that: The thickness of the permanent magnet (7) is 1 mm.

5. A hybrid exciter based on an alternating pole configuration according to claim 1, characterized in that: The rotor core (2) has a magnetic pole slot (8) on its outer side, and the magnetic pole (3) is embedded in the magnetic pole slot (8).

6. The hybrid exciter based on alternating pole configuration according to claim 1, characterized in that: The magnetic pole directions of adjacent magnetic poles (3) differ by 120 degrees.

7. The hybrid exciter based on alternating pole configuration according to claim 1, characterized in that: The magnetic poles (3) are provided with 36.

8. The hybrid exciter based on alternating pole configuration according to claim 1, characterized in that: The excitation coil (6) has 12 coils.

9. A hybrid exciter based on an alternating pole configuration according to claim 2, characterized in that: The permanent magnet (7) has 6 units.

10. A hybrid exciter based on an alternating pole configuration according to claim 1, characterized in that: The rotor core (2), stator core (4) and partition (5) are made of neodymium iron boron material.

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