CN110855042A - Fixing structure for magnetic steel and rotating shaft of inner rotor motor - Google Patents
Fixing structure for magnetic steel and rotating shaft of inner rotor motor Download PDFInfo
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- CN110855042A CN110855042A CN201911230868.XA CN201911230868A CN110855042A CN 110855042 A CN110855042 A CN 110855042A CN 201911230868 A CN201911230868 A CN 201911230868A CN 110855042 A CN110855042 A CN 110855042A
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- protective sleeve
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 160
- 239000010959 steel Substances 0.000 title claims abstract description 160
- 230000001681 protective effect Effects 0.000 claims abstract description 84
- 239000000919 ceramic Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K1/2733—Annular magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor, which comprises a rotating shaft, wherein a first magnetic steel protective sleeve, a magnetic steel body and a second magnetic steel protective sleeve are sequentially sleeved along the axial direction of the rotating shaft; the rotating shaft is provided with a key and a pin which form axial limiting; a cylindrical hole is formed in the center of the magnetic steel body, and a plurality of grooves are formed in the end part of one end of the magnetic steel body; the first magnetic steel protective sleeve is provided with a first end plate and a first cylinder, the first cylinder is matched with one end of a cylinder hole, the first cylinder is provided with a first shaft hole, the wall of the first shaft hole is provided with a key groove, and the first end plate is provided with a plurality of bosses matched with the grooves; the second magnet steel protective sleeve is provided with a second end plate and a second cylinder, the first cylinder is matched with the other end of the cylinder hole, the second cylinder is provided with a second shaft hole, and a rotary buckle type mortise and tenon structure is arranged between the end part of the first cylinder and the end part of the second cylinder. The invention has the advantages of reliable axial and circumferential fixation, convenient disassembly, suitability for large torque output and long service life.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor.
Background
The brushless direct current motor is developed on the basis of the traditional brush direct current motor, a mechanical phase-changing device, namely an electric brush, is cancelled, the advantage of convenient speed regulation of the direct current motor is kept, the brushless direct current motor has reliable performance, no abrasion, low failure rate and high efficiency, and is widely applied to the field of household appliances; the permanent magnet synchronous motor and the brushless direct current motor are similar in structure, generally, the motor with the direct current bus voltage is considered to be the brushless direct current motor, and the motor with the sine alternating current bus voltage is considered to be the permanent magnet synchronous motor.
For a rotating motor, the magnetic steel is generally arranged on the rotor, and the armature is arranged on the stator, so that an electric brush can be omitted, the cost is saved, and the reliability of the motor is improved. The fixing of the magnetic steel and the shaft of the inner rotor motor is always difficult, and the rotating speed and the output torque of the motor can be limited if the design is not reasonable. The magnetic steel protective sleeve of the motor has the advantages that the magnetic steel is protected from being damaged due to impact on one hand, and the magnetic steel is firmly fixed with the shaft on the other hand, so that the torque is transmitted between the magnetic steel and the shaft. The fixing structure commonly used in the industry at present is that after a shaft and magnetic steel are positioned, the shaft and the magnetic steel are integrally molded through injection molding, and the process method is simple and efficient, has high production efficiency and is very suitable for motors with small torque. However, when the motor is started frequently or the torque suddenly changes, the structure is likely to fall off from the shaft, and the motor and even the household appliance are damaged. In this regard, many researchers have proposed many improvements.
Chinese patent CN109347231A discloses a novel magnetic steel baffle structure, including rotor and baffle, circumference is provided with a plurality of magnet steels on the lateral wall of rotor, every adjacent two all separate through the baffle between the magnet steel, it is a plurality of connected mode between baffle and the rotor is the welding plate, every all overlap in proper order on the baffle is equipped with ring, spring and supports the board, the front side of baffle is seted up and is supported the circular groove of supporting of board assorted with a plurality of. However, this construction has significant disadvantages: 1. the air gap between the rotor and the stator is enlarged, so that the magnetic leakage is increased, the acting force of a magnetic field on the rotor is reduced, and the output torque is reduced; 2. the back electromotive force of the rotor to the coil is reduced, so that the current is increased, the power consumption is increased, and the motor generates heat.
Chinese patent CN208806672U discloses an inner rotor brushless motor rotor and an inner rotor brushless motor using the same, which comprises a magnet, a locking component and a rotating shaft, and is simple and compact, occupies less space in installation, improves the dynamic balance of the rotor, and is suitable for a low-torque high-speed motor. But the connection of the shaft and the bush still depends on interference fit, which is not beneficial to the output of the motor torque and limits the service life of the motor.
Chinese patent CN109412292A provides a rotor assembly and a motor, the rotor assembly includes a rotating shaft, a magnetic steel and a steel bushing, the outer wall of the magnetic steel is provided with a spiral groove, the steel bushing can be clamped in the spiral groove to fix the magnetic steel by spiral winding. The mode has a simple structure and is convenient to process, but the diameter of the rotating shaft is larger, the thickness of the magnetic steel is larger, materials are wasted while the rotational inertia is increased, and the circumferential force and the axial force for fixing the magnetic steel and the rotating shaft are not generated.
In summary, there are many patents describing the fixing method of the rotating shaft and the magnetic steel, but there are more or less defects in the key technology of the fixed connection, such as: circumferential and axial fixation, torque transmission, convenient disassembly, material saving, simple manufacture and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor is reliable in axial circumferential fixing, convenient to detach, suitable for large-torque output and long in service life.
In order to solve the technical problem, the invention provides a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor, which comprises a rotating shaft, wherein a first magnetic steel protective sleeve, a magnetic steel body and a second magnetic steel protective sleeve are sequentially sleeved along the axial direction of the rotating shaft, and the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are respectively connected with two ends of the magnetic steel body;
a key and a pin are arranged on the rotating shaft, and the key and the pin respectively form axial limiting on the first magnetic steel protective sleeve and the second magnetic steel protective sleeve;
a cylindrical hole is formed in the center of the magnetic steel body, and a plurality of grooves which are arranged at equal intervals along the circumferential direction are formed in the end part of one end, connected with the first magnetic steel protective sleeve, of the magnetic steel body;
the first magnetic steel protective sleeve is provided with a first end plate and a first cylinder fixedly arranged at the center of the first end plate, the first cylinder is in interference fit with one end of the cylinder hole, the center of the first cylinder is provided with a first shaft hole in interference fit with the rotating shaft, the hole wall of the first shaft hole is provided with a key groove, and the inner end face of the first end plate is provided with a plurality of bosses in fit with the grooves;
the second magnetic steel protective sleeve is provided with a second end plate and a second cylinder fixedly arranged in the center of the second end plate, the second cylinder is in clearance fit with the other end of the cylinder hole, and a second shaft hole in clearance fit with the rotating shaft is arranged in the center of the second cylinder;
the end part of the first cylinder is provided with a tenon, the periphery of the tenon is provided with a turn buckle, the end part of the second cylinder is provided with a mortise jointed with the tenon, the groove wall of the mortise is provided with a turn buckle groove for turning the buckle, and the direction of the screw in the turn buckle is opposite to the rotating direction of the rotor.
As a preferable scheme of the present invention, the plurality of screwing buckles are arranged at equal intervals in the circumferential direction, and the plurality of screwing grooves are arranged at equal intervals in the circumferential direction.
As a preferable scheme of the present invention, the first cylinder and the second cylinder are both provided with a plurality of flow guiding holes which are arranged at equal intervals along the circumferential direction and are axially communicated.
As a preferable scheme of the present invention, a plurality of first adjusting holes are formed in the outer end surface of the first end plate, the first adjusting holes being arranged at equal intervals along the circumferential direction, and first balancing weights are arranged in the first adjusting holes; a plurality of second adjusting holes which are arranged at equal intervals along the circumferential direction are formed in the outer end face of the second end plate, and second balancing weights are arranged in the second adjusting holes.
As a preferable scheme of the invention, two ends of the rotating shaft are respectively connected with a bearing.
As a preferable mode of the present invention, the outer end surface of the bearing is provided with a seal ring.
As a preferable scheme of the present invention, the outer end surface of the second end plate is provided with a plurality of L-shaped pad platforms arranged at equal intervals along the circumferential direction, the L-shaped pad platforms are provided with ceramic sheets, and the ceramic sheets abut against the inner end surface of the bearing.
As a preferable scheme of the invention, the ceramic plate is hexagonal, and the number of the L-shaped pad platforms is 6 and is respectively matched with six edges of the ceramic plate.
As a preferable scheme of the present invention, the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are made of a magnetic insulating material.
Compared with the prior art, the fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor has the beneficial effects that:
(1) during assembly, the axial positions of the rotating shaft relative to the magnetic steel body, the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are realized through key connection and pin fixation, and the circumferential positions of the rotating shaft and the first magnetic steel protective sleeve are realized through interference fit and key connection of the rotating shaft and the first axial direction; the axial positions of the first magnetic steel protective sleeve and the magnetic steel body are realized through interference fit of the first cylinder and the cylindrical hole, and the circumferential positions of the first magnetic steel protective sleeve and the magnetic steel body are realized through the fit of the boss and the groove and the interference fit of the first cylinder and the cylindrical hole; the axial position and the circumferential position of the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are realized through the rotary buckle type mortise and tenon structure, and the fixation of the axial position of the magnetic steel body is realized. Therefore, the fixing structure among the rotating shaft, the magnetic steel body, the first magnetic steel protective sleeve and the second magnetic steel protective sleeve adopts at least two fixing processes except the second magnetic steel protective sleeve no matter in the axial position or the circumferential position, so that the upper limit of the transmission torque value among all parts is improved, and the reliability of the structure is improved;
(2) the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are connected in a rotating buckle type mortise and tenon joint structure, the rotating direction of a rotating buckle is opposite to the rotating direction of the rotor, and when the rotor is static, the mortise and tenon joint structure can improve the reliability of the interconnection of the first magnetic steel protective sleeve and the second magnetic steel protective sleeve and ensure that the magnetic steel protective sleeves are not easy to fall off; when the rotor rotates, the rotary buckle type mortise and tenon structure is fastened, so that the torque can be transmitted to the magnetic steel protective sleeve by the magnetic steel body and then transmitted to the rotating shaft; when the demagnetization occurs to the magnetic steel body, the second magnetic steel protective sleeve rotates in the same direction as the rotor, so that the first magnetic steel protective sleeve and the second magnetic steel protective sleeve can be separated, and the effect of convenient magnetic steel disassembly is achieved.
In conclusion, the fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor has the advantages of reliable axial and circumferential fixing, convenience in disassembly, suitability for large-torque output and long service life.
Drawings
FIG. 1 is a front view of a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor provided by the invention;
FIG. 2 is an isometric view of a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor provided by the invention;
FIG. 3 is an exploded view of a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor provided by the invention;
FIG. 4 is a cross-sectional view taken along line A-A of the structure shown in FIG. 1;
FIG. 5 is a schematic view of the inner end side of the first magnetic steel protective sleeve;
FIG. 6 is a schematic structural view of the outer end side of the first magnetic steel protective sleeve;
FIG. 7 is a schematic view of the inner end side of the second magnetic steel protective sleeve;
FIG. 8 is a schematic view of the outer end side of the second magnetic steel protective sleeve;
fig. 9 is a schematic structural diagram of the magnetic steel body.
In the figure: 1. the rotating shaft, 2, a first magnetic steel protective sleeve, 21, a first end plate, 22, a first cylinder, 23, a first shaft hole, 24, a key groove, 25, a boss, 26, a tenon, 27, a screwing buckle, 28, a flow guide hole, 29, a first balancing weight, 3, a magnetic steel body, 31, a cylinder hole, 32, a groove, 4, a second magnetic steel protective sleeve, 41, a second end plate, 42, a second cylinder, 43, a mortise, 44, a screwing buckle groove, 45, a flow guide hole, 46, a second balancing weight, 47, an L-shaped cushion table, 48, a second shaft hole, 5, a key, 6, a pin, 7, a bearing, 8, a sealing ring, 9 and a ceramic chip.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., used herein are used in the orientation or positional relationship indicated in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, either fixedly connected, detachably connected, or integrally connected, unless otherwise explicitly stated or limited; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 9, in a preferred embodiment of the present invention, a fixing structure for magnetic steel and a rotating shaft of an inner rotor motor includes a rotating shaft 1, a first magnetic steel protective sleeve 2, a magnetic steel body 3, and a second magnetic steel protective sleeve 4 are sequentially sleeved along an axial direction of the rotating shaft 1, and the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4 are respectively connected to two ends of the magnetic steel body 3.
In this embodiment, the rotating shaft 1 is provided with a key 5 and a pin 6, preferably a semi-circular key 5 and a cotter pin 6, and the key 5 and the pin 6 respectively form axial limit on the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4; a cylindrical hole 31 is formed in the center of the magnetic steel body 3, and a plurality of grooves 32, specifically 3 grooves 32, are formed in the end portion of one end, connected with the first magnetic steel protective sleeve 2, of the magnetic steel body 3 at equal intervals along the circumferential direction; the first magnetic steel protective sleeve 2 is provided with a first end plate 21 and a first cylinder 22 fixedly arranged at the center of the first end plate 21, the first cylinder 22 is in interference fit with one end of the cylinder hole 31, a first shaft hole 23 in interference fit with the rotating shaft 1 is arranged at the center of the first cylinder 22, a key groove 24 is arranged on the hole wall of the first shaft hole 23, and a plurality of bosses 25, specifically 3 bosses 25, matched with the grooves 32 are arranged on the inner end face of the first end plate 21; the second magnetic steel protective sleeve 4 is provided with a second end plate 41 and a second cylinder 42 fixedly arranged at the center of the second end plate 41, the second cylinder 42 is in clearance fit with the other end of the cylinder hole 31, and a second shaft hole 48 in clearance fit with the rotating shaft 1 is arranged at the center of the second cylinder 42; the end of the first cylinder 22 is provided with a tenon 26, the periphery of the tenon 26 is provided with a turn buckle 27, the end of the second cylinder 42 is provided with a mortise 43 jointed with the tenon 26, the wall of the mortise 43 is provided with a turn buckle groove 44 into which the turn buckle 27 is screwed, and the screwing direction of the turn buckle 27 is opposite to the rotating direction of the rotor.
During assembly, the axial positions of the rotating shaft 1 relative to the magnetic steel body 3, the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4 are realized by connecting the keys 5 and fixing the pins 6, and the circumferential positions of the rotating shaft 1 and the first magnetic steel protective sleeve 2 are realized by the interference fit of the rotating shaft 1 and the first axial direction and the connection of the keys 5; the axial positions of the first magnetic steel protective sleeve 2 and the magnetic steel body 3 are realized through the interference fit of the first cylinder 22 and the cylindrical hole 31, and the circumferential positions of the first magnetic steel protective sleeve 2 and the magnetic steel body 3 are realized through the fit of the boss 25 and the groove 32 and the interference fit of the first cylinder 22 and the cylindrical hole 31; the axial position and the circumferential position of the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4 are realized through the rotary buckle type mortise and tenon structure, and meanwhile, the fixation of the axial position of the magnetic steel body 3 is also realized. Therefore, in the fixing structure among the rotating shaft 1, the magnetic steel body 3, the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4, except the second magnetic steel protective sleeve 4, at least two fixing processes are adopted no matter in the axial position or the circumferential position, so that the upper limit of the transmission torque value among all parts is improved, and the reliability of the structure is improved.
It should be further noted that the connection mode between the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4 adopts a rotary buckle type mortise and tenon joint structure, the screwing direction of the rotary buckle 27 is opposite to the rotation direction of the rotor, and when the rotor is static, the mortise and tenon joint structure can improve the reliability of the mutual connection between the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4, so as to ensure that the magnetic steel protective sleeves are not easy to fall off; when the rotor rotates, the rotary buckle type mortise and tenon structure is fastened, so that the torque can be transmitted to the magnetic steel protective sleeve and then to the rotating shaft 1 by the magnetic steel body 3; when the demagnetization occurs to the magnetic steel body 3, the second magnetic steel protective sleeve 4 rotates in the same direction as the rotor, so that the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4 can be separated, and the effect of convenient magnetic steel disassembly is achieved.
Therefore, the fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor has the advantages of being reliable in axial and circumferential fixing, convenient to detach, suitable for large-torque output and long in service life.
Exemplarily, in order to guarantee that a large torque can be transmitted between the first magnetic steel protective sleeve 2 and the second magnetic steel protective sleeve 4, the turnbuckle 27 is provided with a plurality of and is arranged along the circumferential direction equidistance interval, the turnbuckle slot 44 is provided with a plurality of and is arranged along the circumferential direction equidistance interval. In this embodiment, there are 3 screwing buckles 27 and 3 screwing buckle grooves 44.
Illustratively, the first cylinder 22 and the second cylinder 42 are each provided with a plurality of axially communicating baffle holes 28, 45 arranged at equal intervals in the circumferential direction. When used in wet rotor motors, the deflector holes 28, 45 ensure hydraulic balance on both sides of the rotor. In this embodiment, the number of the flow guide holes is 3.
Illustratively, a plurality of first adjusting holes are formed in the outer end surface of the first end plate 21 and are arranged at equal intervals along the circumferential direction, and first balancing weights 29 are arranged in the first adjusting holes; a plurality of second adjusting holes are formed in the outer end face of the second end plate 41 and are arranged at equal intervals along the circumferential direction, and second balancing weights 46 are arranged in the second adjusting holes. From this, first regulation hole and second regulation hole all regard as the dynamic balance regulation hole, require higher rotor structure to the dynamic balance, through the weight alright the dynamic balance of adjusting the rotor of configuration balancing weight on adjusting the hole, are applicable to high rotational speed rotor. In this embodiment, there are 3 first and second weights 29 and 46, and preferably lead blocks.
Illustratively, two ends of the rotating shaft 1 are respectively connected with a bearing 7, and the outer end surface of the bearing 7 is provided with a sealing ring 8. The bearing 7 is a graphite bearing, is low in price and small in friction force, and is matched with a rubber ring to fix the rotor in the rotor cavity.
Illustratively, a plurality of L-shaped pad platforms 47 arranged at equal intervals along the circumferential direction are arranged on the outer end surface of the second end plate 41, a ceramic sheet 9 is arranged on the L-shaped pad platforms 47, and the ceramic sheet 9 abuts against the inner end surface of the bearing 7, so that the output end of the rotating shaft 1 is more compact and stable.
Illustratively, the ceramic wafer 9 is hexagonal, the L-shaped pad platform 47 is provided with 6 and respectively cooperates with six edges of the ceramic wafer 9 to prevent the ceramic wafer 9 from rotating circumferentially.
Exemplarily, first magnet steel protective sheath 2 with the material of second magnet steel protective sheath 4 is magnetic material, and preferably plastics play insulating protection, easily make moreover, can form through the integration injection moulding, and the die sinking is controlled from top to bottom to first magnet steel protective sheath 2 casting needs, and the die sinking is controlled only to second magnet steel protective sheath 4 need, the mass production of being convenient for.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A fixing structure for magnetic steel and a rotating shaft of an inner rotor motor is characterized by comprising a rotating shaft, wherein a first magnetic steel protective sleeve, a magnetic steel body and a second magnetic steel protective sleeve are sequentially sleeved along the axial direction of the rotating shaft, and the first magnetic steel protective sleeve and the second magnetic steel protective sleeve are respectively connected with two ends of the magnetic steel body;
a key and a pin are arranged on the rotating shaft, and the key and the pin respectively form axial limiting on the first magnetic steel protective sleeve and the second magnetic steel protective sleeve;
a cylindrical hole is formed in the center of the magnetic steel body, and a plurality of grooves which are arranged at equal intervals along the circumferential direction are formed in the end part of one end, connected with the first magnetic steel protective sleeve, of the magnetic steel body;
the first magnetic steel protective sleeve is provided with a first end plate and a first cylinder fixedly arranged at the center of the first end plate, the first cylinder is in interference fit with one end of the cylinder hole, the center of the first cylinder is provided with a first shaft hole in interference fit with the rotating shaft, the hole wall of the first shaft hole is provided with a key groove, and the inner end face of the first end plate is provided with a plurality of bosses in fit with the grooves;
the second magnetic steel protective sleeve is provided with a second end plate and a second cylinder fixedly arranged in the center of the second end plate, the second cylinder is in clearance fit with the other end of the cylinder hole, and a second shaft hole in clearance fit with the rotating shaft is arranged in the center of the second cylinder;
the end part of the first cylinder is provided with a tenon, the periphery of the tenon is provided with a turn buckle, the end part of the second cylinder is provided with a mortise jointed with the tenon, the groove wall of the mortise is provided with a turn buckle groove for turning the buckle, and the direction of the screw in the turn buckle is opposite to the rotating direction of the rotor.
2. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor in claim 1, wherein the plurality of the turn-buckle slots are provided and are arranged at equal intervals along the circumferential direction, and the plurality of the turn-buckle slots are provided and are arranged at equal intervals along the circumferential direction.
3. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor in claim 1, wherein the first cylinder is in interference fit with the cylinder hole.
4. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor in claim 1, wherein the first cylinder and the second cylinder are provided with a plurality of flow guiding holes which are arranged at equal intervals along the circumferential direction and are axially communicated.
5. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor according to claim 1, wherein a plurality of first adjusting holes are formed in the outer end surface of the first end plate and are arranged at equal intervals along the circumferential direction, and first balancing weights are arranged in the first adjusting holes; a plurality of second adjusting holes which are arranged at equal intervals along the circumferential direction are formed in the outer end face of the second end plate, and second balancing weights are arranged in the second adjusting holes.
6. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor according to claim 1, wherein bearings are respectively connected to two ends of the rotating shaft.
7. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor in claim 6, wherein the outer end face of the bearing is provided with a sealing ring.
8. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor in claim 6, wherein the outer end surface of the second end plate is provided with a plurality of L-shaped pad platforms arranged at equal intervals along the circumferential direction, the L-shaped pad platforms are provided with ceramic plates, and the ceramic plates abut against the inner end surface of the bearing.
9. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor according to claim 8, wherein the ceramic plate is hexagonal, and the number of the L-shaped pad stages is 6 and is respectively matched with six edges of the ceramic plate.
10. The fixing structure for the magnetic steel and the rotating shaft of the inner rotor motor according to claim 1, wherein the first magnetic steel protecting sleeve and the second magnetic steel protecting sleeve are made of a magnetic insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911230868.XA CN110855042B (en) | 2019-12-04 | 2019-12-04 | Fixing structure for magnetic steel and rotating shaft of inner rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911230868.XA CN110855042B (en) | 2019-12-04 | 2019-12-04 | Fixing structure for magnetic steel and rotating shaft of inner rotor motor |
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| Publication Number | Publication Date |
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| CN110855042A true CN110855042A (en) | 2020-02-28 |
| CN110855042B CN110855042B (en) | 2024-06-14 |
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| CN201911230868.XA Active CN110855042B (en) | 2019-12-04 | 2019-12-04 | Fixing structure for magnetic steel and rotating shaft of inner rotor motor |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN210744870U (en) * | 2019-12-04 | 2020-06-12 | 广东沃顿科技有限公司 | Fixing structure for magnetic steel and rotating shaft of inner rotor motor |
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| CN102355103A (en) * | 2011-09-20 | 2012-02-15 | 北京航空航天大学 | Electromagnetic-piezoelectric-mixed-driving-based three-degree-of-freedom spherical motor |
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| CN107492962A (en) * | 2017-08-31 | 2017-12-19 | 杭州中豪电动科技股份有限公司 | A kind of magnetic steel fixed structure of disc type electric machine |
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| CN209340206U (en) * | 2019-01-22 | 2019-09-03 | 汇润电气有限公司 | A kind of electronic water pump for automobile and its turbine mechanism |
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| CN110855042B (en) | 2024-06-14 |
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