阅读说明：本技术 一种电励磁同步磁阻无刷发电系统 (electro-magnetic synchronous reluctance brushless power generation system ) 是由 李健 王凯 刘闯 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种电励磁同步磁阻无刷发电系统,包括电励磁同步磁阻无刷电机、功率变换器、供电电源、不可控整流器、直流电气负载或交流电气负载；定子上绕有电枢绕组和交流励磁绕组；转子的直轴磁阻和交轴磁阻不等；交流励磁绕组产生的磁通经直轴形成的低磁阻路径,从而建立气隙磁场；通过功率变换器控制交流励磁绕组的直轴励磁电流的大小,实现气隙磁场的调节和输出电压的调节；当需直流发电时,电枢绕组的输出端通过不可控整流器与直流电气负载相连；当需交流发电时,电枢绕组的输出端直接与交流电气负载相连。本发明在做发电机时,只需要控制交流励磁绕组的功率变换器,而不需全功率可控变换器,大大降低了功率变换器的容量。(The invention discloses an electro-magnetic synchronous reluctance brushless power generation system, which comprises an electro-magnetic synchronous reluctance brushless motor, a power converter, a power supply, an uncontrollable rectifier, a direct current electric load or an alternating current electric load, wherein an armature winding and an alternating current excitation winding are wound on a stator, the direct-axis magnetic resistance and the alternating-axis magnetic resistance of a rotor are unequal, magnetic flux generated by the alternating current excitation winding passes through a low magnetic resistance path formed by a direct shaft so as to establish an air-gap magnetic field, the size of direct-axis excitation current of the alternating current excitation winding is controlled through the power converter so as to realize the adjustment of the air-gap magnetic field and the adjustment of output voltage, when the direct current power generation is required, the output end of the armature winding is connected with the direct current electric load through the uncontrollable rectifier, and when the alternating current power generation is required, the output end of the armature winding is directly connected with the alternating current electric load.)

The electric excitation synchronous reluctance brushless power generation system is characterized by comprising an electric excitation synchronous reluctance brushless motor, a power converter, a power supply, an uncontrollable rectifier, a direct current electric load and/or an alternating current electric load;

the electrically excited synchronous reluctance brushless motor comprises a stator and a rotor;

the stator is wound with an armature winding and an alternating current excitation winding; the armature winding and the alternating current excitation winding are both alternating current windings, and the number of pole pairs of the armature winding and the alternating current excitation winding is equal to the number p of pole pairs of the rotor;

the input end of the AC excitation winding is connected with a power supply through a power converter; the direct-axis magnetic resistance and the quadrature-axis magnetic resistance of the rotor are not equal;

a rotating excitation magnetic field generated by the alternating-current excitation winding passes through a low-reluctance path formed by the straight-axis magnetic circuit, so that an air-gap magnetic field is established; the power converter is used for controlling the direct-axis exciting current of the alternating-current exciting winding to realize the adjustment of an air-gap magnetic field, so that the adjustment of the output voltage of the output end of the armature winding is realized;

when direct current power generation is needed, the output end of the armature winding is connected with a direct current electrical load through an uncontrollable rectifier;

when alternating current power generation is needed, the output end of the armature winding is directly connected with an alternating current electrical load.

2. The electrically excited synchronous reluctance brushless power generation system according to claim 1, wherein: the mechanical angle of the quadrature axis lags the direct axis in the rotor is 360/(4 × p).

3. The electrically excited synchronous reluctance brushless power generation system according to claim 2, wherein: the rotor is a salient pole rotor, the direct axis is the center line of a salient pole of the rotor, and the quadrature axis is the center line of two salient poles in the salient pole rotor.

4. The electrically excited synchronous reluctance brushless power generation system according to claim 2, wherein: the rotor is a magnetic barrier rotor, the straight axis is the central line of the two groups of magnetic barriers, and the quadrature axis is the central line of the magnetic barriers.

5. The brushless electric power generation system of claim 4, wherein the magnetic barrier rotor comprises 2p magnetic barrier groups uniformly distributed along the circumferential direction of the rotor, and each magnetic barrier group comprises or more than two magnetic barriers arranged in a stacked manner.

6. The brushless electric power generating system of claim 5, wherein the magnetic barrier rotor further comprises bar-shaped tangential magnetic barriers, and bar-shaped tangential magnetic barriers are arranged between two adjacent magnetic barrier groups in the radial direction.

7. The electrically excited synchronous reluctance brushless power generation system according to claim 2, wherein: the rotor is a mixed rotor formed by mixing salient poles and magnetic barriers, the mixed rotor comprises 2p salient poles and 2p magnetic barrier groups, the 2p magnetic barrier groups are arranged on a rotor iron core between every two adjacent salient poles, each magnetic barrier group is a single-layer magnetic barrier or a multi-layer magnetic barrier, and each magnetic barrier is arc-shaped, V-shaped or strip-shaped.

Technical Field

The invention relates to the field of design and manufacture of motors and systems, in particular to an electrically excited synchronous reluctance brushless power generation system.

Background

Permanent magnet motors have the advantages of high torque/power density, high efficiency, high power factor, etc., and have found use in many applications. However, field weakening of permanent magnet motors is achieved by controlling the direct-axis current component in the armature windingi _d ) To achieve this, permanent magnets have the risk of irreversible demagnetization and have limited flux weakening capability. Moreover, when the permanent magnet motor is applied to power generation occasions such as an aviation power supply and the like, a full-power controllable converter is needed to realize voltage regulation.

The rotor of the switched reluctance motor has no permanent magnet or winding, has simple and reliable structure and is suitable for high-temperature and high-speed operation. However, the switched reluctance motor also needs a full-power controllable converter to realize reactive power excitation during power generation operation, and the power factor is low.

The synchronous reluctance motor also has the advantages of simple and reliable structure of the switched reluctance motor, and is applied to driving occasions such as electric automobiles and the like. However, the conventional synchronous reluctance motor has no excitation source and generates reluctance torque by a salient pole effect. Therefore, such machines can only be operated as electric motors.

The conventional excitation source is dc excitation, i.e. adding dc excitation windings to the rotor or stator. However, even if a dc excitation winding is added to the stator, the conventional synchronous reluctance motor cannot generate a rotating excitation magnetic field that rotates synchronously with the rotor, and thus cannot realize excitation; and the direct current excitation winding is added on the rotor, and the direct current is provided for the direct current winding only by installing the electric brush and the slip ring, so that the reliability of the system is inevitably reduced by the armature and the slip ring.

Disclosure of Invention

The technical problem to be solved by the invention is to provide kinds of electrically excited synchronous reluctance brushless power generation systems aiming at the defects of the prior art, when the electrically excited synchronous reluctance brushless power generation system is used as a generator, only a power converter of an alternating current excitation winding needs to be controlled, and a full-power controllable converter is not needed, so that the capacity of the power converter is greatly reduced.

In order to solve the technical problems, the invention adopts the technical scheme that:

electrically excited synchronous reluctance brushless power generation system comprises an electrically excited synchronous reluctance brushless motor, a power converter, a power supply, an uncontrollable rectifier, a direct current electric load and/or an alternating current electric load.

An electrically excited synchronous reluctance brushless motor includes a stator and a rotor.

The stator is wound with an armature winding and an alternating current excitation winding. The armature winding and the alternating current excitation winding are alternating current windings, and the number of pole pairs of the armature winding and the alternating current excitation winding is equal to that of the rotor.

The input end of the AC excitation winding is connected with a power supply through a power converter. The direct axis reluctance and quadrature axis reluctance of the rotor are not equal.

The rotating excitation magnetic field generated by the alternating-current excitation winding passes through a low-reluctance path formed by the straight-axis magnetic circuit, so that an air-gap magnetic field is established. The power converter controls the direct-axis exciting current of the alternating-current exciting winding to adjust the air-gap magnetic field, and further, the output voltage of the armature winding output end is adjusted.

When direct current power generation is needed, the output end of the armature winding is connected with a direct current electrical load through an uncontrollable rectifier.

When alternating current power generation is needed, the output end of the armature winding is directly connected with an alternating current electrical load.

The mechanical angle of the quadrature axis lags the direct axis in the rotor is 360/(4 × p).

The rotor is a salient pole rotor, the direct axis is the center line of a salient pole of the rotor, and the quadrature axis is the center line of two salient poles in the salient pole rotor.

The rotor is a magnetic barrier rotor, the straight axis is the central line of the two groups of magnetic barriers, and the quadrature axis is the central line of the magnetic barriers.

The magnetic barrier rotor comprises 2p magnetic barrier groups uniformly distributed along the circumferential direction of the rotor, and each magnetic barrier group comprises or more than two magnetic barriers arranged in a stacked mode.

The magnetic barrier rotor also comprises strip-shaped tangential magnetic barriers, and strip-shaped tangential magnetic barriers arranged along the radial direction are arranged between two adjacent magnetic barrier groups.

The rotor is a mixed rotor formed by mixing salient poles and magnetic barriers, the mixed rotor comprises 2p salient poles and 2p magnetic barrier groups, the 2p magnetic barrier groups are arranged on a rotor iron core between every two adjacent salient poles, each magnetic barrier group is a single-layer magnetic barrier or a multi-layer magnetic barrier, and each magnetic barrier is arc-shaped, V-shaped or strip-shaped.

The invention has the following beneficial effects:

1. when the invention is used as a generator, only the power converter capable of controlling the alternating current excitation winding is needed, and a full-power controllable converter is not needed, so that the capacity of the converter is greatly reduced, and the capacity of the power converter is only 1/5 of the full-power controllable converter.

The armature winding end of the traditional permanent magnet generator or switched reluctance generator directly sends out electric energy (the electric energy is the power generated by the whole motor at the moment), in order to adjust the output voltage, the armature winding end of the traditional permanent magnet generator or switched reluctance generator needs a controllable power converter, the power level of the power converter at the moment needs to be matched with the power level of the whole motor, and the traditional permanent magnet generator or switched reluctance generator is called a full-power controllable power converter, certainly, the traditional permanent magnet generator or switched reluctance generator is controllable, and also needs a corresponding controller, because the voltage is adjusted by the armature output end, the generator can only be used as a direct current generator, and needs to be used as an alternating current generator, and a -level inverter is additionally added to convert the sent direct current into alternating current.

The voltage regulation of the invention is regulated by controlling the exciting current of the AC exciting winding, but not by controlling the armature end. Therefore, the present invention only needs to control the current of the excitation winding, and the power level required by the excitation winding is the whole motor power level (approximate range: 1/10-1/4). Thus, the capacity of the controllable power converter of the present invention is greatly reduced.

2. The armature winding is connected with an uncontrollable rectifier (such as bridge diode rectification) to carry out direct current power generation operation; the armature winding is directly connected with an alternating current load to realize alternating current power generation. Due to the uncontrolled rectifier, no corresponding controller is required. When the direct current power generation is carried out, the controllable power converter at the armature end is cancelled and is replaced by the uncontrolled rectifier; the output DC voltage is regulated by controlling the exciting current (changing the exciting magnetic field).

3. The voltage regulation in the prior art is realized by directly regulating voltage (such as a permanent magnet generator) through a full-power controllable converter at an armature end or regulating an excitation magnetic field (such as a direct-current excitation motor) in a direct-current excitation mode so as to regulate output voltage, and the invention is the organic combination of an alternating-current excitation brushless motor and a power generation system, and is not a single motor or a power generation system.

Drawings

Fig. 1 shows a schematic diagram of electrically excited synchronous reluctance brushless power generation systems of the present invention.

Fig. 2 shows a diagram of an embodiment of an electrically excited synchronous reluctance brushless motor according to the present invention.

Fig. 3 shows an example of a magnetic barrier rotor.

Fig. 4 shows an example of a salient pole rotor.

Figure 5 shows an example of a mixing rotor.

Among them are:

10. a stator; 11. an armature winding; 12. an AC excitation winding;

20. a rotor; 21. a magnetic barrier; 22. a strip-shaped tangential magnetic barrier; 23. and (4) salient poles.

Detailed Description

The invention is described in further detail with reference to the drawings and the detailed description of the preferred embodiment.