CN209642521U - A kind of multi-phase permanent linear electric generator - Google Patents

Abstract

The utility model discloses a multi-phase permanent magnet linear generator, which comprises a stator and a mover; the stator includes a stator iron core and a stator winding; the mover includes a mover iron core and a permanent magnet ring; the outer surface of the stator iron core has mN annular slots; the stator winding includes a plurality of annular windings. The beneficial effects of the utility model are: the utility model adopts a new winding method, the winding factor is improved, and the amplitude of the synthetic electromotive force of each phase is greatly improved; only a single-phase winding is placed in the stator core slot, and the interphase insulating material is omitted , At the same time, it can avoid the internal phase-to-phase short circuit fault of the generator, which increases the reliability of the system; it has high power density, and is simple to manufacture and easy to insert wires. The generator uses permanent magnet excitation, and there is no excitation loss.

Description

A multi-phase permanent magnet linear generator

technical field

The utility model belongs to the technical field of linear generators, in particular to a multi-phase permanent magnet linear generator, which is mainly used in the field of wave power generation.

Background technique

Wave energy has the advantages of practicability, predictability, continuity, and high power density. It is a very attractive renewable energy source. Therefore, many researchers at home and abroad have conducted research on the use of wave energy to generate electricity. At present, wave power generation systems mostly rely on intermediate transmission devices to drive rotating electrical machines to generate electricity, which has complex structures, high manufacturing and maintenance costs, and low conversion efficiency.

Direct drive wave power generation system will solve these problems through permanent magnet linear generator. In the direct drive system, the linear generator is directly coupled with the buoy, eliminating the need for an intermediate transmission device, which has a simple structure and improves the reliability and energy conversion efficiency of the system. At present, the permanent magnet linear generator is based on the float type direct drive wave power generation system, which uses the wave motion to drive the generator mover to make a linear reciprocating motion, and the magnetic force line cuts the stator winding to generate an induced electromotive force. Due to the unstable movement speed of the generator mover, the frequency of the potential generated in the stator winding is not fixed. It is necessary to use power electronic devices to convert the generated electric energy into 50Hz power frequency power, and then the electric energy can be supplied to electrical equipment or sent to the grid. The cylindrical permanent magnet linear generator can greatly reduce the normal force and eliminate the end winding, which improves the stability and efficiency of the system. However, the existing cylindrical permanent magnet linear generator still has the problems of low winding utilization, large volume and low output power.

Patent No. CN201410261932.1 "A Wave Energy Power Generation Device Based on a Series Linear Magnetic Gear Motor" discloses a power generation device, but the stator winding in this patent adopts fractional slot concentrated winding, which makes the potential waveform of each phase more sinusoidal , but there is a phase difference in the induced potential of each coil in each phase, which leads to a decrease in the total potential amplitude and reduces the output power of the generator.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multi-phase permanent magnet linear generator. The purpose is to adapt to the requirements of the direct-drive wave power generation system, further increase the power density of the generator, reduce the manufacturing cost of the generator, and improve economic benefits.

In order to achieve the above object, the utility model is implemented according to the following technical solutions:

A multi-phase permanent magnet linear generator, including a stator and a mover, the stator includes a stator core and a stator winding;

There is a shaft hole through the center of the stator core; a stator shaft is fixed in the shaft hole;

There are mN annular slots on the outer surface of the stator core; m is the number of phases, and the value is an integer greater than or equal to 3; N is the number of unit modules, and the value is a positive integer; every m adjacent slots is a unit module ;

The stator winding includes a plurality of annular windings; the annular windings are embedded in annular slots; the head ends of the annular windings in each annular slot are on the same side of the stator core; the winding directions of each annular winding are the same;

The mover includes a mover iron core and a permanent magnet ring; the mover iron core is cylindrical, sleeved outside the stator, and coaxial with the stator iron core; the permanent magnet ring is attached to the mover along the axial direction The inner surface of the sub-core;

There is an air gap between the stator core and the permanent magnet ring.

Further, the connection structure of the annular winding in the annular slot is as follows: the tail end of the first slot annular winding is connected to the head end of the m+1th slot annular winding, the tail end of the second slot annular winding is connected to the m+2th slot annular winding The head end of the ring winding in the third slot is connected, and the tail end of the ring winding in the third slot is connected with the head end of the ring winding in the m+3th slot. . . .

Further, the pole distance between the permanent magnet rings is ;The slot pitch of the annular slot of the stator core is ; polar distance and slot pitch Satisfy .

Further, the ring winding connection structure between each unit module remains unchanged.

Further, the annular groove is a rectangular open groove.

Further, the permanent magnet ring adopts one of radial magnetization, axial magnetization and Halbach magnetization.

Compared with the prior art, the beneficial effects of the utility model are:

1. This new model adopts a new winding method, the winding factor is improved, and the amplitude of the synthetic electromotive force of each phase is greatly improved. Compared with the fractional slot concentrated winding, although the sine of the output voltage waveform is slightly lower, the amplitude of the fundamental wave is improved, so the output power of the generator is greatly improved.

2. This new model adopts a new winding method. Only single-phase windings are placed in the stator core slot, which saves the interphase insulating material, and at the same time can avoid the interphase short circuit fault inside the generator, increasing the system reliability.

3. The permanent magnet linear generator of the present invention has high power density, is simple to manufacture, and is easy to insert wires. The generator uses permanent magnets for excitation, and there is no excitation loss.

Description of drawings

Fig. 1 is the three-dimensional schematic view of the utility model;

Figure 2 is a schematic diagram of the axial section of the utility model (the arrow in the figure indicates the magnetization direction of the permanent magnet ring);

Fig. 3 is the three-dimensional structural diagram of the permanent magnet ring of the present invention (the arrow indicates the direction of the magnetic force line);

Fig. 4 is a schematic diagram of the stator core and the ring winding of the utility model (the arrow indicates the direction of the current).

In the figure: 1. mover core; 2. permanent magnet ring; 3. air gap; 4. ring winding; 5. stator core; 6. stator shaft; 7. shaft hole; 8. ring groove.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the utility model are used to explain the utility model, but not as a limitation to the utility model.

As shown in Figures 1 to 4, a multi-phase permanent magnet linear generator includes a stator and a mover, and the stator includes a stator core 5 and a stator winding.

The center of the stator core 5 has a through shaft hole 7 , and the stator shaft 6 is fixed in the shaft hole 7 , and the stator core 5 is fixed by the stator shaft 6 . The outer surface of the stator core 5 is provided with six annular slots 8 along the circumference; each annular slot 8 is a rectangular open slot. The stator winding includes six annular windings 4 ; the annular windings 4 are respectively embedded in six annular slots 8 .

The mover includes a mover iron core 1 and six permanent magnet rings 2 . The mover iron core 1 is cylindrical, sheathed outside the stator, and coaxial with the stator iron core 5; the permanent magnet ring 2 is arranged and pasted on the inner surface of the mover iron core 1 along the axial direction. The permanent magnet rings 2 adopt radial magnetization, and the magnetization directions of adjacent permanent magnet rings 2 differ by 180°.

There is an air gap 3 between the stator core 5 and the permanent magnet ring 2 . Both the stator core 5 and the mover core 1 are made of laminated silicon steel sheets; the permanent magnet ring 2 is made of NdFeB material; the stator shaft 6 is made of alloy steel material.

Among them, the pole pitch of the permanent magnet ring 2 Slot distance from stator core 5 Satisfy .

In this embodiment, the number of phases m=3, which are phase A, phase B, and phase C respectively; the number of unit modules N=2, which are respectively the first unit module and the second unit module; that is, each unit module is bipolar Three slots. The head ends of the annular windings 4 in each annular slot 8 are on the same side of the stator core 5; the winding directions of each annular winding 4 are the same.

A1, B1, C1, X1, Y1, Z1 belong to the first unit module, and A2, B2, C2, X2, Y2, Z2 belong to the second unit module. Among them, A1, B1, C1, A2, B2, and C2 are the first ends of the stator windings, all of which are on the same side of the stator core; X1, Y1, Z1, X2, Y2, and Z2 are the tail ends of the stator windings. The connection mode of the ring winding of phase A is A1-X1-A2-X2; the connection mode of the ring winding of phase B is B1-Y1-B2-Y2; the connection mode of the ring winding of phase C is C1-Z1-C2-Z2. Here, the ring windings of the three phases A, B, and C can be connected in star form or in delta form.

In actual use, the number of unit modules can be appropriately increased according to different usage requirements.

The technical solution of the utility model is not limited to the limitations of the above-mentioned specific embodiments, and any technical deformation made according to the technical solution of the utility model falls within the protection scope of the utility model.

Claims (6)

1. A polyphase permanent magnet linear generator comprises a stator and a mover, and the stator comprises a stator core and a stator winding; it is characterized in that: There is a shaft hole through the center of the stator core; a stator shaft is fixed in the shaft hole; There are mN annular slots on the outer surface of the stator core; m is the number of phases, and the value is an integer greater than or equal to 3; N is the number of unit modules, and the value is a positive integer; every m adjacent slots is a unit module ; The stator winding includes a plurality of annular windings; the annular windings are embedded in annular slots; the head ends of the annular windings in each annular slot are on the same side of the stator core; the winding directions of each annular winding are the same; The mover includes a mover iron core and a permanent magnet ring; the mover iron core is cylindrical, sleeved outside the stator, and coaxial with the stator iron core; the permanent magnet ring is attached to the mover along the axial direction The inner surface of the sub-core; There is an air gap between the stator core and the permanent magnet ring. 2. A kind of polyphase permanent magnet linear generator according to claim 1, is characterized in that: The ring winding connection structure in the ring groove is as follows: The tail end of the first slot annular winding is connected to the head end of the m+1th slot annular winding, the tail end of the second slot annular winding is connected to the head end of the m+2th slot annular winding, and the tail end of the third slot annular winding It is connected to the head end of the ring winding of the m+3th slot. . . . 3. a kind of polyphase permanent magnet linear generator according to claim 1, is characterized in that: the pole pitch between the permanent magnet rings is ;The slot pitch of the annular slot of the stator core is ; polar distance and slot pitch Satisfy . 4. A polyphase permanent magnet linear generator according to claim 1, characterized in that: the ring winding connection structure between each unit module remains unchanged. 5. A multi-phase permanent magnet linear generator according to claim 1, characterized in that: said annular groove is a rectangular open groove. 6. A multiphase permanent magnet linear generator according to claim 1, characterized in that: the permanent magnet ring adopts one of radial magnetization, axial magnetization and Halbach magnetization.