A two-pole synchronous reluctance motor

Abstract

The application provides a two-pole synchronous reluctance motor, which comprises a rotor, two sets of windings are arranged on the rotor, and a mixed excitation winding for realizing harmonic self-excitation is arranged, one set of windings is a fundamental wave four times frequency winding for realizing harmonic charging, and the other set of windings is a fundamental wave same frequency winding for adjusting excitation; the edge end loss of the winding is reduced, and the flexibility of multi-phase winding control is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a two-pole synchronous reluctance motor. BACKGROUND

[0002] Although the common permanent magnet synchronous motor has the characteristics of high efficiency, energy saving, power density, etc., the rare earth material has increased several times in recent years, which has become a bottleneck restricting the development of the permanent magnet synchronous motor. Moreover, the back electromotive force of the permanent magnet synchronous motor is high in the high-speed weak magnetic region, the weak magnetic efficiency is low, and the weak magnetic torque cannot achieve the expected effect.

[0003] For asynchronous motors, the motor loss is too large in the low slip rate area. Under the working condition characteristics of frequent starting and high load of automobiles, asynchronous motors often have low efficiency.

[0004] The power electronic switches for controlling the motor have high switching frequency in the high-speed region, and the switching loss of the multi-pole motor is large. At the same time, the carrier frequency limits the maximum speed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a two-pole synchronous reluctance motor, which reduces the edge loss of the winding and improves the control flexibility of the multi-phase winding.

[0006] The present application is implemented as follows: a two-pole synchronous reluctance motor, comprising a rotor, the rotor is provided with two sets of windings, a mixed excitation winding for realizing harmonic self-excitation, wherein one set of windings is a fundamental four times frequency winding for realizing harmonic charging, and the other set of windings is a fundamental same frequency winding for adjusting excitation.

[0007] Further, the fundamental four times frequency winding is a plurality of excitation bars, and the fundamental same frequency winding is a plurality of excitation bars.

[0008] Further, the rotor is provided with two-pole permanent magnets.

[0009] The present application has the following advantages:

[0010] The two-end winding circuit reduces the edge loss of the winding and improves the control flexibility of the multi-phase winding. The intelligent low-voltage multi-phase motor stator is designed, the bar is used to realize the low-voltage winding function, and the high-speed running back electromotive force is reduced. The two-pole permanent magnet auxiliary synchronous reluctance motor rotor is designed, the two-pole synchronous reluctance motor rotor is used to obtain a wide weak magnetic performance area; the permanent magnet auxiliary is used to improve the synchronous reluctance torque. Two sets of windings are designed on the rotor to realize the mixed excitation winding of harmonic self-excitation; one set of windings is a fundamental four times frequency winding for realizing harmonic charging, and the other set of windings is a fundamental same frequency winding for adjusting excitation. The four times harmonic is injected into the stator multi-phase winding to charge the four times frequency winding of the rotor to realize the brushless mixed excitation function. BRIEF DESCRIPTION OF DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the rear view of the motor in Embodiment 1 of the present invention;

[0013] Figure 2 This is a cross-sectional view of the motor according to Embodiment 1 of the present invention;

[0014] Figure 3 This is a schematic diagram of the rear end of a sectional view of a component according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the connection between the stator core and the power supply component in an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of a stator core according to an embodiment of the present invention;

[0017] Figure 6 This is a schematic diagram of the connection between the stator and the power supply switch according to an embodiment of the present invention;

[0018] Figure 7 This is a schematic diagram of the connection between the stator core and the conductor bar in an embodiment of the present invention;

[0019] Figure 8 This is a schematic diagram of the rear side of a stator strip according to an embodiment of the present invention;

[0020] Figure 9 This is a schematic diagram of the front side of a stator strip according to an embodiment of the present invention;

[0021] Figure 10 This is a schematic diagram of the rear side of the rotor core connected to the shaft in Embodiment 1 of the present invention;

[0022] Figure 11 This is a schematic diagram of the front side of the connection between the rotor core and the shaft in Embodiment 1 of the present invention;

[0023] Figure 12 This is a cross-sectional view of the connection between the rotor core and the shaft in Embodiment 1 of the present invention;

[0024] Figure 13 This is a schematic diagram of the connection between the rotor core and the permanent magnet in Embodiment 1 of the present invention;

[0025] Figure 14 This is a rear view of the rotor excitation bar connection according to Embodiment 1 of the present invention;

[0026] Figure 15 This is a front view of the rotor excitation bar connection according to Embodiment 1 of the present invention;

[0027] Figure 16 This is a rear view of the rotor excitation bar connection according to Embodiment 1 of the present invention;

[0028] Figure 17 Figure 1 is a front view of the connection of the rotor excitation guide bar of the embodiment one of the present application;

[0029] Figure 18 Figure 2 is a schematic diagram of the excitation guide bar of the embodiment one of the present application;

[0030] Figure 19 Figure 3 is a schematic diagram of the excitation guide bar of the embodiment one of the present application;

[0031] Figure 20 Figure 4 is a schematic diagram of the rotor guide slot distribution of the embodiment one of the present application;

[0032] Figure 21 Figure 5 is a schematic diagram of the rectification excitation circuit of the embodiment one of the present application;

[0033] Figure 22 Figure 6 is a schematic diagram of the permanent magnet single action magnetic force line distribution of the embodiment one of the present application;

[0034] Figure 23 Figure 7 is a schematic diagram of the excitation guide bar single action magnetic force line distribution of the embodiment one of the present application;

[0035] Figure 24 Figure 8 is a schematic diagram of the excitation guide bar four times frequency induction magnetic force line distribution of the embodiment one of the present application;

[0036] Figure 25 Figure 9 is a schematic diagram of the different working conditions of the motor of the embodiment one of the present application.

[0037] 1 - front end cover; 2 - machine shell; 3 - rear end cover; 4 - rotating shaft; 5 - outgoing terminal terminal box; 6 - control circuit terminal; 7 - positive power supply terminal; 8 - negative power supply terminal; 9 - front bearing; 10 - rear bearing; 11 - stator core; 12 - rotor core; 13 - stator guide bar; 13a - stator guide bar power supply end face; 14 - stator guide bar power supply switch circuit; 14a - stator guide bar power supply switch circuit terminal; 15 - negative voltage equalizing ring; 16 - positive voltage equalizing ring; 17 - stator guide bar power supply control circuit board; 18 - stator guide bar end ring; 19 - rectification excitation circuit board; 20 - excitation guide bar; 20a - excitation guide bar connection terminal; 20b - excitation guide bar end ring; 21 - excitation guide bar; 21a - excitation guide bar connection terminal; 21b - excitation guide bar front end connection line; 21c - excitation guide bar rear end connection line; 22 - rotor guide slot; 22e - rotor excitation guide slot; 22f - rotor excitation guide slot; 23 - rotor shaft hole; 24 - permanent magnet; E - distribution of excitation guide slot and guide bar; F - distribution of excitation guide slot and guide bar; + - distribution of positive polarity; - - distribution of negative polarity; E-1, E-2,..., E-k - distribution of the first, second to k excitation guide bars. DETAILED DESCRIPTION

[0038] The application discloses a two-pole synchronous reluctance motor, which aims at reducing the edge end loss of winding and improving the flexibility of multi-phase winding control.

[0039] The application discloses a two-pole synchronous reluctance motor, which comprises a rotor, two sets of windings are arranged on the rotor, and a mixed excitation winding for realizing harmonic self-excitation is arranged on the rotor, one set of windings is a fundamental wave four times frequency winding for realizing harmonic charging, and the other set of windings is a fundamental wave same frequency winding for adjusting excitation, the fundamental wave four times frequency winding is a plurality of excitation bars, the fundamental wave same frequency winding is a plurality of excitation bars, and two-pole permanent magnets are arranged on the rotor.

[0040] Embodiment one

[0041] As shown in the figure, the motor is covered by a front end cover 1, a casing 2 and a rear end cover 3. Figures 1 to 19 The motor is covered by a front end cover 1, a casing 2 and a rear end cover 3.

[0042] The inside of the casing 2 is provided with a stator core 11.

[0043] The stator core 11 is uniformly provided with a plurality of stator bars 13.

[0044] The other end of the stator bar 13 is connected together through an end ring 18.

[0045] The rotor core 12 rear end surface is equipped with a rectifier excitation circuit board 19. The rotor core 12 middle has a shaft hole 23. The rotor core 12 near the outer surface is evenly distributed along the circumference twenty guide slots 22, of which ten excitation guide slots 22e and ten excitation guide slots 22f. Ten excitation guide bars 20 are inserted into the ten excitation guide slots 22e, and ten excitation guide bars 21 are inserted into the ten excitation guide slots 22f. Ten permanent magnets 24 are embedded in the rotor core 12 in the same direction. The two ends of the permanent magnet 24 are respectively close to one guide slot 22.

[0046] The ten excitation guide bar rear terminals 20a are connected to the rectifier excitation circuit board 19, and the front terminals are connected together through the excitation guide bar end ring 20b. The two excitation guide bar rear terminals 21a are connected to the rectifier excitation circuit board 19, and the excitation guide bar is connected together through the front terminal connection line 21b and the rear terminal connection line 21c.

[0047] As shown in Figure 20 and 21 , the guide slots 22 are distributed along the circumferential surface of the rotor core 12 cross section, and are respectively allocated as excitation E and excitation F. Starting from the position opposite the permanent magnet, every other guide slot 22 is allocated as an excitation E guide slot 22e, with the positive polarity + and negative polarity - alternating. Except for the excitation E guide slot 22e, the rest are allocated as excitation F guide slots 22f, and the excitation guide slots 22f at the same end of the permanent magnet are allocated as the same polarity, and the other end is allocated as the other polarity, which are respectively the positive polarity + and the negative polarity -.

[0048] As shown in Figures 22 to 24 , the permanent magnet 24 generates a two-pole working magnetic field perpendicular to the pole surface of the permanent magnet, and the excitation guide bar 21 generates a two-pole working magnetic field in the same direction as the magnetic field of the permanent magnet 24, and the excitation guide bar 20 works in the four times frequency, eight-pole harmonic magnetic field of the working magnetic field.

[0049] As shown in Figure 25 , the motor has four working conditions, namely light load starting, heavy load starting, normal running and high speed field weakening.

[0050] When starting under light load and normal running, the stator bar 13 is connected to a two-pole magnetic field working current, and the air gap generates a two-pole magnetic field, which interacts with the two-pole working magnetic field formed by the permanent magnet 24 to form a working torque.

[0051] When starting under heavy load, the stator bar 13 injects an alternating four times frequency eight-pole harmonic current with a certain amplitude, forming a four times frequency eight-pole harmonic magnetic field. The four times frequency eight-pole harmonic magnetic field generates an induced voltage in the excitation guide bar 20, and the induced voltage provides current for the excitation guide bar 21 through the rectifier excitation circuit board 19. The excitation guide bar 21 generates a two-pole working magnetic field in the same direction as the magnetic field of the permanent magnet 24, which enhances the air gap main magnetic field and improves the motor torque and heavy load capacity.

[0052] High speed and weak magnetic time: through wireless control rotor rectification excitation circuit board 19 changes excitation guide strip 21 positive and negative polarity, excitation guide strip 21 generates two-pole magnetic field in the opposite direction of permanent magnet 24 magnetic field, weakens air gap working main magnetic field, reduces motor induced voltage, improves motor speed.

[0053] Although the specific embodiments of the application have been described above, it will be understood by those skilled in the art that the specific embodiments described are merely illustrative and not intended to limit the scope of the application, and equivalent modifications and variations made in accordance with the spirit of the application should be covered by the scope of the claims of the application.

Claims

1. A two-pole synchronous reluctance machine comprising a rotor, characterised in that: The rotor is provided with two sets of windings for realizing the harmonic self-excitation mixed excitation winding, one set of winding is the fourth harmonic winding for realizing the harmonic charging, and the other set of winding is the fundamental frequency winding for adjusting excitation; The fourth harmonic winding is a plurality of excitation guide strips, and the fundamental frequency winding is a plurality of excitation guide strips; the rotor is provided with two-pole permanent magnets; The rotor core rear end surface is provided with a rectifier excitation circuit board, the ten connection terminals of the rear end of the excitation guide strip are connected to the rectifier excitation circuit board, the front end is connected together through the excitation guide strip end ring, the two connection terminals of the rear end of the excitation guide strip are connected to the rectifier excitation circuit board, and the excitation guide strip is connected together through the front end connection line and the rear end connection line; The guide grooves are distributed along the circumferential surface of the rotor core cross section, and are respectively allocated as excitation guide grooves and excitation guide grooves, starting from the position opposite to the permanent magnet, every other guide groove is allocated as an excitation guide groove, the positive polarity + and the negative polarity - of the excitation guide groove are alternately changed, the excitation guide grooves at the same end of the permanent magnet are allocated as the same polarity, and the other end is allocated as the other polarity, which are respectively the positive polarity + and the negative polarity -, and the excitation guide strip works in the four times frequency, eight-pole harmonic magnetic field of the working magnetic field.

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