Fixing structure of permanent magnet and permanent magnet eddy current device

Abstract

The utility model provides a fixing structure of a permanent magnet, which is used for fixing a first part with magnetism on a second part, the surface of the second part is provided with a sinking groove for installation and positioning, and the height of the sinking groove is lower than that of the first part; the second part is provided with stop blocks around the sinking groove, the stop blocks form a dovetail groove for accommodating the first part on the outer side of the sinking groove in the height direction, and the stop blocks are provided with limiting walls at the two ends of the dovetail groove in the length direction; the dovetail groove is in limiting fit with the first part in the height direction, and the limiting wall is in limiting fit with the first part in the horizontal direction. And when the first component has a movement trend relative to the dovetail groove and the limiting wall, the dovetail groove and the limiting wall provide limiting force opposite to the relative movement direction for the first component. The utility model further provides a permanent magnet eddy current device which comprises the fixing structure.

Description

Technical Field

[0001] The present technology relates to the field of permanent magnet eddy current, and in particular to a permanent magnet fixing structure and a permanent magnet eddy current device. Background Art

[0002] Currently, there are three main ways to fix the rotor magnet in permanent magnet eddy current devices. The first is to fix the magnet to the rotor iron plate through magnetic glue. In this solution, the glue may fail due to temperature and aging, which will cause the magnet to slide and dislocate.

[0003] The second method is to use dovetail groove fixation, which is mostly used on motor rotor cores. The disadvantage of this solution is that when the cross-section is consistent, there is no limit along the length of the dovetail groove. If the force direction of the magnetic steel is toward the length of the dovetail groove, the magnetic steel is easy to slide. There is also a gap on the left and right of the dovetail groove, which can only achieve simple positioning but not compression.

[0004] The third method is to use overall potting. Although the fixing effect of potting protection is better than the first two methods, if there is no special equipment, the tooling is difficult to implement and it is easy to cause bubbles, cracks, and even uneven surfaces that will affect the air gap of the mechanical structure (the gap between the stator and the mover, the space that produces the air gap field, most of which is within 3mm), thereby causing structural mechanical interference, and the choice of potting glue also has a great influence on the fixing effect. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a permanent magnet fixing structure, which can realize reliable limiting of the magnetic steel of the mover in all directions, and is not easy to affect the mechanical structure air gap of the stator and the mover, thereby avoiding structural mechanical interference.

[0006] In order to solve the above technical problems, the utility model provides a permanent magnet fixing structure, comprising a first component and a second component, wherein the fixing structure is used to fix the first component with magnetism to the second component, and a recessed groove for installation and positioning is provided on the surface of the second component, and the height of the recessed groove is lower than the height of the first component; the second component is provided with a stopper around the recessed groove, and the stopper forms a dovetail groove for accommodating the first component on the outer side of the recessed groove along the height direction, and the stopper is provided with a limiting wall at both ends of the dovetail groove along the length direction;

[0007] The dovetail groove and the first component are limited in the height direction, and the limiting wall and the first component are limited in the horizontal direction; when the first component has a movement tendency relative to the dovetail groove and the limiting wall, the dovetail groove and the limiting wall provide a limiting force to the first component in the opposite direction of the relative movement.

[0008] In some embodiments, the first component is magnetically attracted to the second component when placed in the sink.

[0009] In some embodiments, when the first component is received in the dovetail groove, the height of the first component is higher than the height of the stopper.

[0010] In some of the embodiments, a plurality of independent stoppers are arranged around the sink.

[0011] In some embodiments, the stopper includes a first part and a second part which are perpendicular to each other, the first parts of the plurality of stoppers are assembled to form the dovetail groove, and the second parts of the plurality of stoppers are assembled to form the limiting wall.

[0012] In some embodiments, the stopper is fastened to the second component by a locking member.

[0013] In some embodiments, each corner of the first component is provided with a chamfer, and the depth of the sink is greater than the radius of the chamfer.

[0014] In some embodiments, the first component is a mover magnetic steel.

[0015] In some embodiments, the second component is a mover iron plate.

[0016] In order to solve the above technical problems, the utility model also provides a permanent magnet eddy current device, including the above permanent magnet fixing structure.

[0017] Compared with the prior art, the utility model has the beneficial effect of limiting the first component in the height direction and the horizontal width direction by cooperating with the dovetail groove formed by the recessed groove and the blocks around it on the second component, and limiting the first component in the horizontal length direction by the limiting wall formed on the block, so as to realize reliable limiting of the magnetic first component in all directions on the second component, and not easily affecting the mechanical structure air gap of the stator and the mover, thereby avoiding structural mechanical interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A top view of the fixing structure of the permanent magnet of Example 1;

[0019] Figure 2 It is a side view of the fixing structure of the permanent magnet of Example 1;

[0020] Figure 3 for Figure 1 A cross-sectional view of section AA;

[0021] Figure 4 for Figure 3 An enlarged view of point I;

[0022] Figure 5 Schematic diagram of the stopper 1 of Example 1.

[0023] 1. Block; 2. Locking piece; 3. Movers magnet; 4. Movers iron plate; 5. Sink; 1-1. First part; 1-2. Second part. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0027] Reference Figure 1-Figure 5 This embodiment provides a permanent magnet fixing structure for fixing the first magnetic component mover magnetic steel 3 to the second component mover iron plate 4;

[0028] Specifically, a recessed groove 5 for locating the installation position of the mover magnetic steel 3 is provided on the surface of the mover iron plate 4, and the width of the recessed groove 5 is about 0.1 mm greater than the mover magnetic steel 3, and the recessed groove 5 runs through the mover iron plate 4. Since the recessed groove 5 only plays a positioning role, and in order to maintain the mechanical air gap between the stator and the mover, when the mover magnetic steel 3 is placed in the recessed groove 5, the height of the recessed groove 5 is lower than the height of the mover magnetic steel 3;

[0029] The movable iron plate 4 is provided with four independent blocks 1 around the sink 5, and the block 1 includes a first part 1-1 and a second part 1-2 which are perpendicular to each other, and the first part 1-1 and the second part 1-2 form an L-shaped block 1, and the first parts 1-1 of the plurality of blocks 1 are assembled on the outer side of the sink 5 along the height direction to form a dovetail groove for accommodating the first component, and the second parts 1-2 of the four blocks 1 form limiting walls at both ends of the dovetail groove along the length direction; when the movable magnetic steel 3 is accommodated in the dovetail groove, the movable magnetic steel 3 is limitedly matched with the dovetail groove along the horizontal width direction and the height direction, and the movable magnetic steel 3 is also limitedly matched with the limiting wall along the horizontal length direction, so that the movable magnetic steel 3 can realize reliable limiting in all directions on the movable iron plate 4.

[0030] At the same time, when the mover magnetic steel 3 is accommodated in the dovetail groove, the contact surfaces of the mover magnetic steel 3 and the dovetail groove are tightly attached to each other, so that when the mover magnetic steel 3 has a movement tendency in the horizontal width and height directions relative to the dovetail groove, the dovetail groove provides a limiting force against the relative movement direction to the mover magnetic steel 3, so that the mover magnetic steel 3 cannot slide in the horizontal width and height directions; at the same time, the contact surfaces of the mover magnetic steel 3 and the limiting wall are also tightly attached to each other, so that when the mover magnetic steel 3 has a movement tendency in the horizontal length direction relative to the limiting wall, the limiting wall provides a limiting force against the relative movement direction to the mover magnetic steel 3, so that the mover magnetic steel 3 cannot slide in the horizontal length direction; the mover magnetic steel 3 is firmly fixed on the mover iron plate 4 by the limiting of the dovetail groove and the limiting wall, and will not slide.

[0031] In this embodiment, the mover magnetic steel 3 includes two pieces. In order to be able to fix multiple mover magnetic steels 3 in sequence, multiple blocks 1 are independent of each other. When installing the mover magnetic steel 3, one of the mover magnetic steels 3 is placed in the sink 5 of the mover iron plate 4. The mover magnetic steel 3 and the mover iron plate 4 are magnetically adsorbed to each other so that the mover magnetic steel 3 is initially fixed on the mover iron plate 4. Then, the locking piece on the block 1 that matches the mover magnetic steel 3 is locked so that the mover magnetic steel 3 is firmly pressed by both sides of the block 1. Then, another mover magnetic steel 3 is installed, and the locking piece on the block 1 that matches the mover magnetic steel 3 is locked in the same steps. After each block 1 is locked and pressed on the mover iron plate 4 by the locking piece, the above-mentioned dovetail groove and limiting wall are formed, and the two mover magnetic steels 3 are firmly pressed to achieve reliable limiting in all directions. Among them, the locking piece can be fixed with bolts.

[0032] In order to avoid affecting the mechanical structure air gap between the stator and the mover, thereby causing mechanical interference between the structures, in this embodiment, when the mover magnetic steel 3 is accommodated in the dovetail groove, the height of the mover magnetic steel 3 is higher than the height of the stopper 1. Specifically, Figure 4As shown, the surface of the mover magnetic steel 3 is 0.2 mm higher than the surface of the stopper 1, so that the mover magnetic steel is still the highest plane, does not affect the minimum mechanical air gap value between the stator and the mover, and is not prone to mechanical interference.

[0033] Since each corner of the mover magnetic steel 3 is generally provided with a chamfer, in order to prevent the mover magnetic steel 3 from shaking left and right in the sink 5 when the mover magnetic steel 3 is assembled and placed in the sink 5, it is difficult to fix the subsequent block 1. Figure 5 As shown, the depth of the sink groove 5 is greater than the radius of the chamfer, so that the chamfered portion is completely placed in the sink groove 5. At this time, the non-chamfered portion of the mover magnetic steel 3 can be tightly attached to the inner wall of the sink groove 5, ensuring that the mover magnetic steel 5 and the sink groove 5 can achieve a tight limit fit effect along the horizontal width direction, preventing the mover magnetic steel 3 from shaking left and right to affect the subsequent assembly process.

[0034] If the radius of the rounding is larger than the sink groove 5, the depth of the sink groove 5 is insufficient, the rounding will expose the sink groove, and since the rounding is an arc, there will be a gap between the inner wall of the sink groove, and the positioning cannot be guaranteed to be perfectly tight, and the mover magnet 3 will swing left and right in the sink groove 5. Specifically, in this embodiment, the depth of the sink groove 5 is 0.5 mm, and the rounding radius is 0.3 mm.

[0035] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A permanent magnet fixing structure, comprising a first component and a second component, wherein the fixing structure is used to fix the first magnetic component to the second component, characterized in that: The second component has a recessed groove for installation and positioning on its surface, and the height of the recessed groove is lower than that of the first component; the second component has blocks arranged around the recessed groove, and the blocks form a dovetail groove for accommodating the first component on the outer side of the recessed groove along the height direction, and the blocks are provided with limiting walls at both ends of the dovetail groove along the length direction; The dovetail groove and the first component are limited in the height direction, and the limiting wall and the first component are limited in the horizontal direction; when the first component has a movement tendency relative to the dovetail groove and the limiting wall, the dovetail groove and the limiting wall provide a limiting force to the first component in the opposite direction of the relative movement.

2. The permanent magnet fixing structure according to claim 1, characterized in that: When the first component is placed in the sink, it is magnetically attracted to the second component.

3. The permanent magnet fixing structure according to claim 1, characterized in that: When the first component is accommodated in the dovetail groove, the height of the first component is higher than the height of the stopper.

4. The permanent magnet fixing structure according to claim 1, characterized in that: A plurality of independent stoppers are arranged around the sink.

5. The permanent magnet fixing structure according to claim 4, characterized in that: The stopper includes a first part and a second part which are perpendicular to each other. The first parts of the plurality of stoppers are assembled to form the dovetail groove, and the second parts of the plurality of stoppers are assembled to form the limiting wall.

6. The permanent magnet fixing structure according to claim 1, characterized in that: The stopper is fastened to the second component by a locking member.

7. The permanent magnet fixing structure according to claim 1, characterized in that: Each corner of the first component is provided with a chamfer, and the depth of the sink is greater than the radius of the chamfer.

8. The permanent magnet fixing structure according to claim 1, characterized in that: The first component is a mover magnetic steel.

9. The permanent magnet fixing structure according to claim 1, characterized in that: The second component is a mover iron plate.

10. A permanent magnet eddy current device, characterized in that: A fixing structure for a permanent magnet comprising any one of claims 1 to 9.

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