CN207612187U - Axial flux permanent magnet eddy current coupling with slit chute structure - Google Patents

Abstract

The utility model discloses a kind of axial flux permanent magnet eddy-current couplings with slit flume structure, the conductor rotor being connected with power source including the setting of same central axis and the p-m rotor being connected with load, being separated by between the p-m rotor and conductor rotor has air-gap；Conductor rotor includes the conductor back iron disk of same central axis setting and the composite construction conductor disc close to p-m rotor, the composite construction conductor disc includes the conductor disc ontology of integral structure, and the slit skewed slot being arranged relative to radial skew is circumferentially uniformly provided on the conductor disc ontology, is filled with ferromagnetic chock in each slit skewed slot；P-m rotor includes permanent magnet back iron disk and the permanent magnet array on the permanent magnetism back iron disk.Under the conditions of arbitrary slip speed, the electromagnetic torque density of axial flux permanent magnet eddy-current coupling of the utility model with slit flume structure is higher than traditional structure axial flux permanent magnet eddy-current coupling, and can effectively inhibit the torque pulsation caused by slot effect and electromagnetic noise.

Description

Axial flux permanent magnet eddy current coupling with slit chute structure

technical field

The utility model relates to a shaft coupling, in particular to an axial magnetic flux permanent magnet eddy current coupling with a slit inclined groove structure.

Background technique

Permanent magnet eddy current transmission technology realizes torque transmission without mechanical connection between the driving (motor) side and the driven (load) side. The permanent magnet eddy current coupling connects the conductor rotor with the motor shaft, and mounts the permanent magnet rotor on the load shaft. When the conductor rotor rotates with the motor, due to the relative motion between the conductor rotor and the permanent magnet rotor, an eddy current is generated and a tangential electromagnetic force, namely torque, is transmitted from the motor side to the load side through the air gap. The permanent magnet eddy current coupling has the advantages of no electromagnetic harmonics, good vibration reduction effect, low total cost, low maintenance cost, long service life, etc., and has broad application prospects in many industrial fields.

At present, the conductor discs used in the axial flux permanent magnet eddy current transmission/braking devices that have been marketed are all annular discs with a slotless structure. The disadvantage of this structural scheme is that the magnetic density in the conductor area is not high, so the torque The density is relatively low.

The existing patented technology, on the basis of referring to the slotting structure of the traditional motor core and the empirical value of the tooth-to-slot ratio (about 0.5), proposes that the conductor disk adopts a radial slotting structure, that is, straight slots, and fills the slots with solid ferromagnetic materials. However, eddy currents will also be generated in the slot filling material during actual operation, and this part of the eddy currents has no contribution to the electromagnetic torque, but increases the eddy current loss. In addition, although this structural scheme increases the magnetic density amplitude of the conductor area, the effective conductor eddy current area is greatly reduced due to the contribution to the electromagnetic torque, resulting in this structural scheme only under high slip/speed conditions. The torque density is higher than traditional structure. Since permanent magnet eddy current couplings usually work at low slip speeds, the practical application of this patented technical solution is limited.

On the other hand, after the conductor disk is slotted and filled with high magnetic permeability material, the axial flux permanent magnet eddy current coupling will cause electromagnetic noise and torque ripple during operation due to the cogging effect, so that the motor and load equipment Increased stress and shortened service life. Therefore, the smoothness of the electromagnetic torque is an important index to measure the dynamic performance and steady-state performance of the permanent magnet eddy current drive. However, the existing related patent technology has not yet dealt with the problems of electromagnetic noise and torque ripple of the axial flux permanent magnet eddy current transmission device with cogging structure.

Therefore, urgently need to solve the above-mentioned problem.

Utility model content

Purpose of the utility model: The purpose of the utility model is to provide an axial flux permanent magnet eddy current coupling with a slit chute structure with high torque density, low electromagnetic noise and torque ripple.

Technical solution: In order to achieve the above purpose, the utility model discloses an axial flux permanent magnet eddy current coupling with a slit chute structure, which includes a conductor rotor connected to the power source and a load connected to the same central axis. There is an air gap between the permanent magnet rotor and the conductor rotor; the conductor rotor includes a conductor back iron disk arranged on the same central axis and a composite structure conductor disk close to the permanent magnet rotor, and the composite structure conductor disk includes Conductor disk body with integrated structure, the conductor disk body is uniformly provided with slits obliquely arranged relative to the radial direction, and each slit chute is filled with ferromagnetic wedges; the permanent magnet rotor includes permanent magnets A back iron plate and a permanent magnet array arranged on the permanent magnet back iron plate.

Wherein, the included angle between the slit chute and the radial direction is 1°-12°.

Preferably, the slit chute is a through groove, and the groove shape can be one or more of trapezoidal, rectangular or parallelogram.

Preferably, the average width ratio of the slit chute on the conductor disk body to the adjacent guide bar is 0.01-0.2.

Further, the ratio of the average width of the slit chute on the conductor plate body to the adjacent guide bar is 0.01-0.1.

Preferably, the ferromagnetic wedge is made of a high-permeability silicon steel sheet core or high-permeability solid electrical pure iron coated with an insulating layer, and the axial thickness of the ferromagnetic wedge is the same as that of the conductor disk body.

Furthermore, the permanent magnet array is composed of several concentric and uniform permanent magnets with an even number of magnetic poles, and the permanent magnet array adopts N and S poles alternately distributed magnetic pole array or Halbach permanent magnet array.

Further, the conductor disk body is made of high-conductivity pure copper material.

Preferably, the conductor back iron plate and the permanent magnet back iron plate are made of electrical pure iron material with high strength and high magnetic permeability.

Beneficial effects: Compared with the prior art, the utility model has the following advantages: firstly, when the permanent magnet eddy current coupling of the utility model is working, since the conductor disk body with the slit chute is adopted, and the slit chute Filling in the ferromagnetic wedge reduces the reluctance of the overall magnetic circuit, so that the magnetic density in the conductor area is much higher than that of the traditional structure of the permanent magnet eddy current device; secondly, because the width of the slit chute is very small, no matter whether the ferromagnetic wedge is made of silicon steel sheet or Solid iron core, the eddy current generated during work is also very weak and can be ignored; therefore, the effective conductor eddy current area that contributes to the electromagnetic torque is reserved to the maximum extent, so that the electromagnetic force and electromagnetic torque can be achieved under any slip/speed conditions. The torque density is greatly increased; moreover, since the groove on the conductor disk body adopts the inclined groove method, by selecting a suitable angle of the inclined groove, the conductor rotor cogging structure composed of guide bars and ferromagnetic wedges is inclined to a certain degree relative to the permanent magnet rotor poles. The angle is set so that the average value of the circumferential air gap permeance remains basically constant, so that the air gap flux density does not fluctuate significantly, and the torque ripple of the cogging structure can be effectively suppressed under the premise of ensuring a high torque density, and finally the cutting The stability of the electromagnetic force and the smooth output of the electromagnetic torque can effectively suppress electromagnetic noise and mechanical vibration; in addition, the chute structure of the conductor disk in the utility model is designed to be slotted along a straight line instead of a helical line, so the process is simple and easy accomplish.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the explosion schematic diagram of the utility model;

Fig. 3 is a schematic structural view of the conductor disk body in the utility model;

Fig. 4 is the distribution schematic diagram of ferromagnetic wedge in the utility model;

Fig. 5 is a comparative schematic diagram of torque characteristics under different groove width and bar width ratios in the utility model;

Fig. 6 is a comparative schematic diagram of torque characteristics under different chute and radial angles in the utility model;

Fig. 7 is a schematic diagram of comparing the torque characteristics between the utility model and the existing device;

Fig. 8 is a comparative schematic diagram of the torque-time relationship of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the utility model is further described.

As shown in Figure 1, the axial flux permanent magnet eddy current coupling with a slit chute structure of the present invention includes a conductor rotor 1 and a permanent magnet rotor 2 arranged on the same central axis, and the conductor rotor 1 and the power source are The motor shaft is connected, the permanent magnet rotor 2 is installed on the load shaft, and there is an air gap between the permanent magnet rotor 2 and the conductor rotor 1 . When the conductor rotor 1 rotates with the motor, due to the relative motion between the conductor rotor 1 and the permanent magnet rotor 2, an eddy current is generated in the conductor disk and a tangential electromagnetic force, namely torque, is transmitted from the motor side to the load end through the air gap. Changing the size of the air gap between the permanent magnet rotor 2 and the conductor rotor 1 can change the strength of the magnetic field, and realize stepless speed regulation of the load. In actual operation, the permanent magnet rotor 2 can also be connected to the motor shaft, and the conductor rotor 1 can be connected to the load shaft.

As shown in FIG. 2 , the conductor rotor 1 in the present invention includes a conductor back iron disk 101 arranged on the same central axis and a composite structure conductor disk 102 close to the permanent magnet rotor 2 . The conductor disk 102 of composite structure includes a conductor disk body 104 of an integral structure, and the conductor disk body 104 is evenly provided with slit chute 105 arranged obliquely relative to the radial direction on the upper circumference of the conductor disk body 104, and each slit chute 105 is filled with iron Magnetic wedge 103. The included angle between the slit chute 105 and the radial direction is 1°˜12°.

As shown in Figure 2 and Figure 3, the slit chute 105 of the present invention is a through groove, and is evenly distributed clockwise or counterclockwise along the circumference, and the groove shape can be one or more of trapezoidal, rectangular or parallelogram. The ratio of the average width of the slit chute 105 to the adjacent guide bar 106 is 0.01-0.2, preferably between 0.01 and 0.1.

As shown in Figure 4, the ferromagnetic wedge 103 of the present utility model is made of high permeability silicon steel sheet iron core or high permeability solid electrical pure iron coated with an insulating layer. The axial thicknesses are the same, and the conductor disc body 104 is made of high-conductivity pure copper material.

The permanent magnet rotor 2 includes a permanent magnet back iron plate 201 and a permanent magnet array 202 disposed on the permanent magnet back iron plate 201 . Wherein the permanent magnet array 202 is composed of several concentric and evenly distributed permanent magnets with an even number of magnetic poles, the permanent magnet array adopts N and S poles alternately distributed magnetic pole array or Halbach permanent magnet array (Halbach Array), the conductor back iron plate 101 and The permanent magnet back iron plate 201 is made of high-strength, high-permeability electrical pure iron material.

The working principle of the utility model axial magnetic flux permanent magnet eddy current coupling with slit chute structure: firstly, when the utility model permanent magnet eddy current coupling works, due to the use of the conductor disc body with slit chute, And the ferromagnetic wedge is filled in the slit chute, which reduces the reluctance of the overall magnetic circuit, so that the magnetic density in the conductor area is much higher than that of the traditional permanent magnet eddy current device; secondly, because the slot width of the slit chute is small, the iron Regardless of whether the magnetic wedge is made of silicon steel sheet or solid iron core, the eddy current generated during operation is also very weak and can be ignored; therefore, the effective conductor eddy current area that contributes to the electromagnetic torque is retained to the greatest extent, so that it can achieve any slip/speed Under certain conditions, the density of electromagnetic force and electromagnetic torque is greatly increased; moreover, since the groove on the conductor disk body adopts the inclined groove method, by selecting a suitable angle of the inclined groove, the guide bar and the conductor rotor cogging structure composed of ferromagnetic wedges are opposite to each other. The poles of the permanent magnet rotor are inclined at a certain angle, so that the average value of the circumferential air gap permeance remains basically constant, so that the air gap flux density does not fluctuate significantly, and the cogging structure can be effectively suppressed under the premise of ensuring high torque density. Torque pulsation finally realizes the stability of tangential electromagnetic force and smooth output of electromagnetic torque, and can effectively suppress electromagnetic noise and mechanical vibration.

Effectiveness analysis

As shown in Figure 5, the utility model has carried out the comparative analysis of the torque characteristics under the condition of 4 different slit grooves 105 and the average width ratios of the adjacent guide bars 106, and the ratios of the slot width and the guide bar width are respectively 0.01, 0.1, 0.2, 0.25, the basic parameters of the analyzed permanent magnet eddy current coupling are shown in Table 1.

Among them, the permanent magnet array adopts the magnetic pole array with N and S poles alternately distributed, the permanent magnet material is NdFeB N35SH, and the shape is fan-shaped. The material of the conductor disk is T2 copper, and the back iron of the permanent disk and the conductor disk is DT4 electrical pure iron. The input end of the coupling, that is, the motor speed is constant at 1500rpm.

Table 1 Axial flux permanent magnet eddy current coupling parameters

As shown in Figure 5, the utility model has better torque characteristics in the range of width ratio 0.01 to 0.2, and the maximum torque data deviation is less than 10%; the torque characteristics tend to be consistent in the range of 0.01 to 0.1, and the torque characteristics are the best Ideal; when it is greater than 0.2, the torque in the low-speed area is significantly lower than the torque data in the ratio range of 0.01 to 0.2, for example, when the ratio of groove width to guide bar width is 0.25, the torque generated when the slip speed is 25rpm , which is 15.6% lower than when the ratio of groove width to guide bar width is 0.1; if the ratio is less than 0.01, the existing processing technology is difficult to realize, and because the cross-sectional area of the ferromagnetic wedge decreases sharply, the reluctance increases and the torque will also drop.

As shown in Figure 6, the utility model has carried out the comparative analysis of the torque characteristic under the situation of 4 groups of different slit chute 105 and the angle (inclination angle) of radial direction, and inclination angle is respectively 1 °, 8 °, 12 °, 16°. As shown in Figure 6, the torque characteristics are better in the range of 1° to 12°, and the deviation of the maximum torque data is less than 10%. When the inclination angle is greater than 12°, the torque will drop significantly in the entire speed range.

The utility model also proves the practical effect of the utility model by comparing the torque-slip speed relationship and the torque-time relationship of axial magnetic flux permanent magnet eddy current couplings with different structures.

Using the three-dimensional finite element method, calculate the conductor disk with slit inclined groove structure (the average width ratio of the slit groove 105 and the adjacent guide bar 106 is 0.1, and the angle of deviation from the radial direction is 4°), and the ordinary grooved structure The torque-speed relationship of the axial flux permanent magnet eddy current coupling between the conductor disk (the groove width/the width of the guide bar is 0.4) and the traditional grooveless structure conductor disk is shown in Figure 7. As shown in Figure 7, within the range of the main slip speed range, the electromagnetic torque generated by the slit chute structure conductor disc axial magnetic flux permanent magnet eddy current coupling of the utility model is much higher than that of ordinary slotted Structural Conductor Plates and Traditional Structural Devices.

Figure 8 shows the comparison of the torque-time relationship between the above-mentioned slit chute structure and the common slot structure conductor disk permanent magnet eddy current coupling under the same slip speed condition (150rpm). As shown in Figure 8, the average torque of the device of the present invention is not only 17% higher than that of the ordinary slotted structure device, but also the torque ripple generated during operation is much lower than that of the ordinary slotted structure conductor due to the adoption of the inclined groove structure conductor plate The disc permanent magnet eddy current coupling can realize the smooth output of torque.

Claims (9)

1. a kind of axial flux permanent magnet eddy-current coupling with slit flume structure, it is characterised in that：Including same central axis The conductor rotor (1) being connected with power source being arranged and the p-m rotor (2) being connected with load, the p-m rotor (2) and conductor Being separated by between rotor (1) has air-gap；The conductor rotor (1) includes the conductor back iron disk (101) of same central axis setting With the composite construction conductor disc (102) close to p-m rotor (2), which includes leading for integral structure Body disc ontology (104) is circumferentially uniformly provided with the slit skewed slot being arranged relative to radial skew on the conductor disc ontology (104) (105), ferromagnetic chock (103) is filled in each slit skewed slot (105)；The p-m rotor (2) includes permanent magnet back iron disk (201) and the permanent magnet array (202) on the permanent magnetism back iron disk (201).

2. the axial flux permanent magnet eddy-current coupling according to claim 1 with slit flume structure, it is characterised in that：Institute It is 1 °~12 ° that slit skewed slot (105), which is stated, with radial angle.

3. the axial flux permanent magnet eddy-current coupling according to claim 1 or 2 with slit flume structure, feature exist In：The slit skewed slot (105) is through slot, and one or more of trapezoidal, rectangle or parallelogram may be selected in flute profile.

4. the axial flux permanent magnet eddy-current coupling according to claim 3 with slit flume structure, it is characterised in that：Institute The mean breadth ratio for stating slit skewed slot (105) and adjacent conducting bar (106) on conductor disc ontology (104) is 0.01~0.2.

5. the axial flux permanent magnet eddy-current coupling according to claim 4 with slit flume structure, it is characterised in that：Institute The mean breadth ratio for stating slit skewed slot (105) and adjacent conducting bar (106) on conductor disc ontology (104) is 0.01~0.1.

6. the axial flux permanent magnet eddy-current coupling according to claim 1 with slit flume structure, it is characterised in that：Institute Ferromagnetic chock (103) is stated by Hipersil piece iron core or is coated with the solid electrical pure iron of high permeability of insulating layer and is made, The axial width of the ferromagnetic chock (103) is identical as the axial width of conductor disc ontology (104).

7. the axial flux permanent magnet eddy-current coupling according to claim 1 with slit flume structure, it is characterised in that：Institute Stating permanent magnet array (202), the uniformly distributed permanent magnet in even number of poles is constituted with one heart by several, which uses N, the poles S are alternately distributed array of magnetic dipoles or Halbach permanent magnet array.

8. the axial flux permanent magnet eddy-current coupling according to claim 1 with slit flume structure, it is characterised in that：Institute Conductor disc ontology (104) is stated to be made of the pure copper material of high conductivity.

9. the axial flux permanent magnet eddy-current coupling according to claim 1 with slit flume structure, it is characterised in that：Institute It states conductor back iron disk (101) and permanent magnet back iron disk (201) is made of the electrical pure iron material of high intensity, high permeability.