CN204465308U - Permanent magnet synchronous linear motor capable of reducing thrust fluctuation - Google Patents

Abstract

The utility model discloses a permanent magnet synchronous linear motor capable of reducing thrust fluctuations. The linear motor includes a mover and a stator, a linear guide rail is arranged on the stator, and the mover is installed on the linear guide rail; the stator is composed of upper and lower layers of iron The yoke and several permanent magnets on the inner surface of the iron yoke are composed. The mover is encapsulated by air-core coils. There is an insulating layer between adjacent air-core coils, and the three-phase current is input by the drag chain; its characteristics are: The material of the permanent magnet is NdFe30, and radial magnetization is adopted. The numerical relationship between the distance a between adjacent permanent magnets and the pole pitch b satisfies: a/b=0.120～0.135. The utility model reasonably sets the matching size of the permanent magnet spacing and the pole spacing, so that the air gap magnetic field is closer to a sine wave, reduces thrust fluctuations, and effectively improves positioning accuracy.

Description

A permanent magnet synchronous linear motor capable of reducing thrust fluctuation

technical field

The utility model relates to a permanent magnet synchronous linear motor, in particular to a permanent magnet synchronous linear motor with 12 slots and 7 poles.

Background technique

The 12-slot 7-pole permanent magnet synchronous linear motor has outstanding advantages such as large thrust, good fast response characteristics, simple structure, and maintenance-free, and has been widely used in high-performance linear drive systems. The motor with 12 slots and 7 poles shown in Figure 5 means that six air-core coils correspond to seven pairs of permanent magnets 5 up and down, and the left coil column 8 and the right coil column 9 are the left and right coil columns of the second hollow coil respectively . In the prior art, there is no clear dimensional matching relationship between the spacing between two adjacent permanent magnets 5 on the same iron yoke 4 and the pole pitch, and the matching size between them is relatively random, resulting in the air gap magnetic field waveform of the motor It cannot be effectively approached to a sine wave, which causes large thrust fluctuations when the motor is running, causing large noise and vibration of the motor itself, especially at low speeds, which eventually leads to adverse effects of low positioning accuracy.

Utility model content:

The utility model is to avoid the disadvantages of the above-mentioned prior art, and provides a permanent magnet synchronous linear motor capable of reducing thrust fluctuations, so that the motor can effectively suppress thrust fluctuations and improve its positioning accuracy during operation.

The utility model adopts following technical scheme for solving technical problems:

The utility model is a permanent magnet synchronous linear motor capable of reducing thrust fluctuations, the linear motor includes a mover and a stator, a linear guide rail is arranged on the stator, and the mover is installed on the linear guide rail; the stator is composed of It consists of upper and lower iron yokes and several permanent magnets arranged on the inner surface of the iron yoke. The mover is encapsulated by air-core coils. There is an insulating layer between adjacent air-core coils, and three items are input by the drag chain. electric current; its structural characteristics are: the material selected by the permanent magnet is NdFe30, and radial magnetization is adopted, and the numerical relationship satisfied between the distance a between adjacent permanent magnets and the pole pitch b is: a/b= 0.120～0.135.

The structural features of the permanent magnet synchronous linear motor capable of reducing thrust fluctuations of the utility model also lie in:

The space c between the coil posts on the left and right sides of the air-core coil is equal to the space d between two adjacent air-core coils.

Let the width of the left and right sides of the hollow coil be e, and: e/(d+e)=0.84˜0.86.

The air-core coil adopts concentrated winding.

The insulating layer between the adjacent air-core coils is made of insulating resin glue, and each air-core coil is encapsulated into a whole by insulating resin.

The mover is an ironless mover, and the mover is independently packaged by the hollow coil.

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

The size matching coefficient of the permanent magnet spacing and the pole spacing set by the utility model makes the air gap magnetic field closer to a sine wave, reduces thrust fluctuations, and achieves the effect of improving positioning accuracy. At the same time, it also has the characteristics of low noise, low jitter, simple manufacturing process, and convenient mass production.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model motor;

Fig. 2 is the structural representation of the stator in the utility model;

Fig. 3 is a structural schematic diagram of the mover hollow coil in the utility model;

Fig. 4 is a radial sectional view of the overall structure of the utility model;

Fig. 5 is a radial sectional view of a motor body with 12 slots and 7 poles;

In the figure, numbers 1 mover, 2 stator, 3 linear guide rail, 4 iron yoke, 5 permanent magnet, 6 drag chain, 7 hollow coil, 8 left coil column, 9 right coil column. a the distance between adjacent permanent magnets, b the pole pitch, c the spacing between the left and right coil columns in the air-core coil, d the spacing between two adjacent air-core coils, e the width of the left and right coil columns.

Detailed ways

Referring to Fig. 1 and Fig. 2, the permanent magnet synchronous linear motor capable of reducing thrust fluctuation in this embodiment is the same as the prior art in that it includes a mover 1 and a stator 2, and a linear guide rail 3 is provided on the stator 2, and the mover The sub 1 is installed on the linear guide rail 3; the stator 2 is composed of upper and lower layers of iron yoke 4 and several permanent magnets 5 arranged on the inner surface of the iron yoke 4, and the mover 1 is encapsulated by the hollow coil 7, and the adjacent An insulating layer is provided between the air-core coils 7, and the three-phase current is input by the drag chain 6.

In this embodiment, the material selected for the permanent magnet 5 is NdFe30, and radial magnetization is adopted, and the numerical relationship between the distance a between adjacent permanent magnets and the pole pitch b satisfies: a/b=0.120～0.135 .

In this embodiment, the corresponding structural settings also include: as shown in Figure 4 and Figure 5, the interval c between the left and right coil columns in the air-core coil is equal to the interval d between two adjacent air-core coils; The width of the left and right coil columns in the air-core coil is e, and there is: e/(d+e)=0.84～0.86; the air-core coil 7 adopts concentrated winding; the insulating layer between adjacent air-core coils 7 is made of insulating resin Glue is used as a material, and the hollow coils 7 are encapsulated into a whole by insulating resin; the mover 1 is an ironless mover, and the mover 1 is formed by independent packaging of the hollow coils 7 .

In the specific implementation, the geometric structure size of the permanent magnet itself remains unchanged, and the distance a and the pole distance b between adjacent permanent magnets satisfy: a/b=0.130, so that the waveform of the air gap magnetic field approaches a sine wave and achieves the reduction The purpose of small thrust fluctuations. The mover in this embodiment has no iron core and is directly encapsulated by the coil through resin glue, so that the end force and cogging effect caused by the iron core can be reduced, and it can also serve the purpose of insulation, and the package is integrated for easy installation and maintenance. The mover moves in a straight line; as shown in Figure 3, the cavity size c of the air-core coil 7 in this embodiment is equal to the distance d between adjacent coils, and the coils adopt concentrated winding.

When the mover is connected to the three-phase current, it is magnetically coupled with the stator to generate a thrust, so that the mover makes a reciprocating linear motion relative to the stator. The utility model controls the distance between the adjacent permanent magnets on the same side and the ratio of the pole pitch within a certain range, and adjusts the distance between the adjacent coils and the width of the coil column on one side, so that the two meet a certain Numerical relationship, and use the coreless coil directly as the mover, so that the air gap magnetic field is closer to the sine wave, and at the same time reduce the end force and cogging force, effectively suppressing the thrust fluctuation when the motor is running, The positioning accuracy is improved, and the noise and vibration of the motor are reduced during operation.

Claims (6)

1. one kind can reduce the permanent magnetic linear synchronous motor of force oscillation, described linear electric motors comprise mover (1) and stator (2), described stator (2) is provided with linear guides (3), and described mover (1) is arranged on (3) on linear guides; Described stator (2) is made up of upper and lower two-layer iron yoke (4) and several permanent magnets (5) of being located at iron yoke (4) inner surface, described mover (1) is encapsulated by air core coil (7) to form, be provided with insulating barrier between adjacent air core coil (7), and input three electric currents by drag chain (6); It is characterized in that: the material that described permanent magnet (5) is selected is NdFe30, and adopts radial magnetizing, the numerical relation met between the distance a between adjacent permanent magnet (5) and pole span b is: a/b=0.120 ~ 0.135.

2. the permanent magnetic linear synchronous motor that can reduce force oscillation according to claims 1, is characterized in that: the interval c in described air core coil (7) between the coil column of the left and right sides is equal with the spacing d between adjacent two air core coils (7).

3. the permanent magnetic linear synchronous motor that can reduce force oscillation according to claims 1, is characterized in that: make the width of left and right sides coil column in described air core coil (7) be e, and have: e/ (d+e)=0.84 ~ 0.86.

4. the permanent magnetic linear synchronous motor that can reduce force oscillation according to claims 1, is characterized in that: described air core coil (7) adopts concentratred winding.

5. the permanent magnetic linear synchronous motor that can reduce force oscillation according to claims 1, it is characterized in that: the insulating barrier between described adjacent hollow coil (7) is with insulating resin glue for material, and each air core coil (7) encapsulates in aggregates by insulating resin.

6. the permanent magnetic linear synchronous motor that can reduce force oscillation according to claims 1, it is characterized in that: described mover (1) is iron-core-free mover, described mover (1) is formed by described air core coil (7) individual packages.