CN104868682B - Outward rotation permanent magnet brushless motor - Google Patents

Abstract

The invention relates to an external permanent magnet brushless motor, which is characterized in that a flywheel, a rotor and a stator are arranged between a front support and a rear support, the front support and the rear support are respectively provided with a bearing seat, the two bearing seats are respectively provided with a bearing and more than one gasket and are penetrated through by a transmission shaft, wherein a wave spring is arranged in one bearing seat, each part is an axial clearance-free transmission structure and a prepressing mechanism which are adjacent to each other, when the transmission shaft is pulled by a lateral force, the deformation is not easy to generate, so that the rigidity of a bearing group body can be improved, in addition, a plurality of combining parts are arranged between the front support and the rear support to maintain the relative combination of equal axial distances, more than one combining part is arranged above the central point of the transmission shaft, so that the rigidity of a supporting mechanical structure is enhanced, and the problems of poor structural rigidity and low service life of parts of the existing body-building equipment are.

Description

Outward rotation permanent magnet brushless motor

technical field

The invention relates to an externally rotating permanent magnet brushless motor.

Background technique

Existing belt-driven fitness equipment, such as an exercise bike, is driven by the user's pedals to drive the flywheel of the exercise bike, and the hybrid brake device makes the flywheel generate resistance when rotating, thus allowing the user to step on the exercise bike. It can consume heat at the same time, because the braking torque generated by the generator of the hybrid braking device can only provide partial braking force, and the main braking force still requires an additional hysteresis braking device, so please refer to Figures 13 and 14, which are US invention patents No. 6084325 "Brake device with a combination of power-generating and eddy-current magnetic resistance (combination of power-generating and eddy-current magnetic resistance braking device)", which is pivoted with a transmission shaft 82 between two support frames 81 A stator 83 and a rotor 84 (flywheel), the transmission shaft 82 is connected with the rotor 84 and one end thereof is connected to the fitness equipment, the rotor 84 ring is arranged on the relative outer side of the stator 83, and the outer side of the rotor 84 is provided with a magnetic hysteresis Braking device 85, the stator 83 is wound with multiple sets of coils 831, the rotor 84 is provided with a plurality of permanent magnets 841 in a radial and annular manner, and the two support frames 81 and the stator 83 are provided with multiple sets of coils 831 relative to the transmission shaft 82 A bearing 811 is used to drive the rotor 84 to rotate when the power transmission shaft 82 is rotated under force; since the hybrid braking device does not need to consider the power generation braking capacity and electric energy recovery, most of the kinetic energy generated by the fitness equipment is generated by hysteresis The braking device 85 is converted into heat energy loss, which cannot take into account the power quality and efficiency of power generation. Furthermore, as shown in Figure 14, the braking device is on the torque transmission, and each part on the transmission shaft 82 is fixed on the shaft center, and each part has an axial clearance on the axial configuration, when the transmission shaft When 82 is rotated by an external force, the axial stress of the transmission shaft 82 cannot be directly and continuously transmitted to the rotor 84, and the two support frames 81 and the bearing 811 used to support the rotor 84 cannot effectively absorb the torsion generated by the bearing gap force, resulting in insufficient rigidity of the transmission structure. In addition, the multiple locking bolts 86 between the two support frames 81 are all lower than the imaginary center line of the transmission shaft 82, which is easy to cause two supports due to the tension on the side of the transmission shaft 82. The upper half of the frame 81 is deformed due to insufficient strength, and at the same time, the bearings 811 of the two support frames 81 will have a problem of greatly reducing the service life due to improper stress.

It can be seen from the foregoing that the poor design of the supporting frame of the existing fitness equipment makes there be gaps between the components and the axial stress cannot be directly and continuously transmitted, resulting in poor rigidity of the overall structure, reduced service life of parts and energy consumption. There is a need for improvement.

Contents of the invention

As mentioned above, due to the poor design of the support frame of the existing fitness equipment, there are gaps between the components and the axial stress cannot be directly and continuously transmitted, resulting in poor rigidity of the overall structure, low service life of parts and energy consumption. Therefore, in order to solve the above-mentioned problems, the main purpose of the present invention is to provide an externally rotating permanent magnet brushless motor, which is an externally rotating permanent magnet brushless motor with high rigidity transmission and support structure, which mainly makes the Each component is a non-axial clearance transmission structure adjacent to each other, and the axial preload mechanism reduces the bearing clearance to improve the rigidity of the transmission structure. The joints between the other two support frames are distributed around the support frame. And more than one of the connecting parts is above the central point of the transmission shaft, which can reduce the deformation of the support frame and improve the life of the parts, and solve the problems of poor structural rigidity, low service life of parts and energy consumption of existing fitness equipment.

The main technical solution adopted in order to achieve the above-mentioned purpose is to make the above-mentioned external rotation permanent magnet brushless motor mainly be provided with a flywheel, a stator and a rotor between a front support frame and a rear support frame, and the flywheel has a first surface With a second surface, the first surface is closed, and the second surface is concave to fix the rotor. The rotor ring is arranged on the outside of the stator and can rotate relative to the stator, wherein the front and rear support The frame is divided into a front bearing seat and a rear bearing seat. One end of the front bearing seat is connected to the front support frame. It is provided with a front bearing and more than one front washer. The front bearing and the front washer are clamped on the front bearing seat. Between the first surface of the flywheel, one end of the rear bearing seat is connected to the stator and the other end is connected to the rear bracket, and a wave spring and a rear bearing are interposed between the rear bearing seat and the second surface of the flywheel With more than one rear washer, the front and rear bearings are passed through by a transmission shaft, and the transmission shaft is connected with the flywheel to make the rotor rotate relative to the stator. In addition, the front and rear support frames are provided with multiple joints around The parts are combined with each other, and more than one of the combined parts is located above the center point of the transmission shaft.

Preferably, the rotor is provided with a plurality of permanent magnets, and the rotor corresponding to the magnetic pole range of each permanent magnet is formed with a three-section arc edge.

Preferably, the flywheel is formed with a shaft hole at the center of the first surface, the shaft hole is used for the transmission shaft to pass through, and the transmission shaft and the shaft hole of the flywheel are respectively formed with a groove, and the two grooves are jointly inserted into a pair of Head round keys.

Preferably, the front bearing seat of the front support frame is formed with a front bearing hole, which accommodates the front bearing and abuts against the inner edge of the front bearing hole with a C-shaped buckle.

Preferably, the rear bearing seat of the rear support frame is formed with a rear bearing hole, the rear bearing hole accommodates the rear bearing, and a wave spring is arranged between the rear bearing and the rear bearing hole.

Preferably, the transmission shaft is provided with a pulley at the other end of the front support frame opposite to the flywheel, and the transmission shaft and the pulley respectively form a groove, and the two grooves are jointly inserted into another double-headed round key.

Preferably, the front and rear support brackets respectively form a plurality of locking holes around them, and the combination parts are locking bolts, and the opposite locking holes and locking bolts are jointly penetrated and mutually connected by more than one nut. combined.

Preferably, the rear supporting frame is provided with a sensing circuit board, and the sensing circuit board is provided with more than one sensor, and the sensors correspond to the permanent magnets on the side wall of the rotor.

Preferably, the permanent magnets are approximately distributed in concentric circles at the center point of the rotor, and the edges of each permanent magnet form an imaginary first reference tangent and a second reference tangent, and the first reference tangent is inscribed on each pair of permanent magnets , the second reference tangent is circumscribed on each pair of permanent magnets, and the sensors are separated from each pair of permanent magnets by an appropriate axial distance and distributed on the first reference tangent or the second reference tangent.

Preferably, the front and rear support frames are sheet-shaped and slightly inverted L-shaped in appearance, and the locking hole of one of the coupling parts is located above the center point of the transmission shaft.

Preferably, the front and rear support frames are sheet-shaped and have a slightly T-shaped appearance, and a coupling piece is respectively provided at both ends of the T-shape, and the locking holes of the two coupling pieces are located at the center point of the transmission shaft above.

Preferably, the stator is formed by stacking a plurality of circular silicon steel sheets, and each silicon steel sheet is formed with a plurality of radial wire slots at its periphery, and the number of slots of the wire slots is the same as the number of magnetic poles of the permanent magnets of the rotor. The ratio of the numbers is an integer ratio of six.

Preferably, five reference lines are formed within the range of the rotor corresponding to the magnetic pole range of each permanent magnet, and the first reference line is the tenth reference point and the first arc edge where the center point of the rotor passes through the tooth comb center of the stator The outward extension line of the first reference point of .

Preferably, the second reference line is an outward extension line with a stator pitch distance between the center point of the rotor and the first reference line; the third reference line is the center point of the rotor and is also one distance away from the first reference line. Outward extension of the stator pitch, but on a different side than the second reference line.

Preferably, the fourth reference line is an outward extension line of the center point of the rotor, the eighth reference point of the stator, and the sixth reference point of one of the permanent magnet corners; the fifth reference line is the center point of the rotor , the outward extension line of the ninth reference point of the stator and the seventh reference point of another permanent magnet corner, the position between the fourth reference line and the fifth reference line is the position of the three-section arc edge.

The beneficial effect of the present invention is that: the externally rotating permanent magnet brushless motor composed of the above-mentioned components is to set the flywheel, rotor and stator between the front and rear bearing seats on the front and rear support frames, and the flywheel is driven by the transmission shaft to form a motor. Make the rotor rotate around the stator. When the transmission shaft is pulled by the lateral force, since the parts on the transmission shaft are adjacent to each other and have no axial clearance transmission structure, and the axial preloading mechanism is used to reduce the bearing clearance, it is not easy to produce The elastic deformation of the front and rear support frames can avoid undue stress on the bearings of the front and rear bearing housings and greatly improve the rigidity. In addition, the connecting parts are distributed around the supporting frames, and more than one of the connecting parts is located at the center of the drive shaft Above, strengthen the rigidity of the supporting mechanical structure to reduce the doubts about the deformation of the support frame and improve the life of the parts, and solve the problems of poor structural rigidity, low service life of parts and energy consumption of existing fitness equipment.

Description of drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2 is an exploded view of a preferred embodiment of the present invention.

Fig. 3 is a partial sectional view of a preferred embodiment of the present invention.

Fig. 4 is a side view of a preferred embodiment of the present invention.

Fig. 5 is a side view of the rotor of the preferred embodiment of the present invention.

Fig. 6 is a schematic diagram of a three-section arc edge in a preferred embodiment of the present invention.

FIG. 7 is a comparative diagram of THD in a preferred embodiment of the present invention.

FIG. 8 is a comparative schematic diagram of detent torque scaling in a preferred embodiment of the present invention.

Fig. 9 is a schematic diagram of the comparison between the resonant frequency and the vibration amount of the preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of the configuration of the sensor according to the preferred embodiment of the present invention.

Fig. 11 is a side view of another aspect of the support frame of the preferred embodiment of the present invention.

Fig. 12 is a side view of another aspect of the support frame of the preferred embodiment of the present invention.

Fig. 13 is an external view of a conventional braking device.

Fig. 14 is a sectional view of a conventional braking device.

Description of main component symbols:

10 stator

11 Silicon steel sheet 12 Wire groove

13 Coils

21 Rotor 211 Through slot

22 Permanent magnet 23 Flywheel

231 shaft hole

24 Transmission shaft 241 Double round key

25 Bolt 26 Pulley

31 Front bearing seat 311 Front bearing hole

312 Front bearing 313 C-type buckle

314 Front Washer 315 Screw

32 Rear bearing seat 321 Rear bearing hole

322 Rear Bearing 323 Wave Spring

324 Back Washer 325 Screw

326 bolts

41 Front support frame 411 Front through hole

412 Locking hole

42 Rear support frame 421 Rear through hole

422 locking hole

43 Locking bolt 431 Nut

51 Sensing board 511 Sensor

81 Support frame 811 Bearing

82 drive shaft

83 Stator 831 Coil

84 Rotor 841 Permanent magnet

85 Hysteresis brake 86 Locking bolt.

detailed description

Regarding the preferred embodiment of the present invention, please refer to shown in Fig. 1 to 3, be to be provided with a rotatable rotor 21 on the outer ring of a certain stator 10 periphery, be provided with a plurality of permanent magnets 22 in this rotor 21, and on rotor The outer side of 21 peripheral edges is fixedly provided with a flywheel 23, and the opposite two outer sides of this flywheel 23 and stator 10 are respectively provided with a front support frame 41 and a rear support frame 42, and this stator 10 is to join with rear support frame 42, and this front support frame 41 is provided with a front bearing seat 31 relative to one end of the flywheel 23, and the rear support frame 42 is provided with a rear bearing seat 32 relative to one end of the stator 10, and a transmission shaft 24 is pierced between the front bearing seat 31 and the rear bearing seat 32, And the transmission shaft 24 is connected with the flywheel 23 .

The stator 10 is mainly composed of a plurality of circular silicon steel sheets 11 laminated, and each silicon steel sheet 11 is formed with a plurality of radial wire slots 12 at its periphery, and the wire slots 12 are used for winding multiple groups of coils. 13. In addition, the surface of each silicon steel sheet 11 is coated with an insulating layer, and an insulating sheet (not shown) is sandwiched between the outermost silicon steel sheet 11 and the coil 13; in this preferred embodiment, for The winding method of the coil 13 is not limited.

The flywheel 23 has a first surface and a second surface, the first surface is closed, and the second surface is concave to accommodate and fix the rotor 21, the rotor 21 is annular to surround The outer side of the stator 10 rotates relative to the stator 10, and the rotor 21 is formed with a plurality of through-slots 211 axially penetrating through its front and rear side walls and arranged in a ring shape following the shape of the rotor 21. The through-slots 211 are It is square for accommodating multiple pairs of permanent magnets 22 , and each pair of permanent magnets 22 is in the shape of a square sheet. As shown in Figure 2, the rotor 21 is formed with a plurality of locking holes to be locked to the flywheel 23 through a plurality of bolts 25. In addition, the flywheel 23 is formed with a shaft hole 231 at the center of its first surface, and the shaft hole 231 is used for The drive shaft 24 passes through the drive shaft 24 , and grooves are respectively formed on the drive shaft 24 and the shaft hole 231 of the flywheel 23 for a double-headed round key 241 to be inserted and fixed. In addition, the drive shaft 24 is provided with a pulley 26 at the opposite end of the front bearing seat 31. The drive shaft 24 and the pulley 26 are respectively formed with grooves for another double-headed round key 241 to be plugged and fixed. The pulley 26 is used for external devices (such as fitness equipment) to input rotational force to drive the flywheel 23 and the rotor 20 to rotate relative to the stator 10.

A front bearing hole 311 is formed at the center of the front bearing seat 31, and a front bearing 312 is provided for the front bearing hole 311. A C-shaped buckle 313 and a front washer 314 are further provided between the surfaces, and the C-shaped buckle 313 abuts against the inner edge of the front bearing hole 311 to prevent unexpected axial displacement of the front bearing 312. The front washer 314 is sandwiched To fill the axial gap between the front bearing 312 and the flywheel 23 , the front bearing seat 31 is locked to the front support frame 41 by a plurality of screws 315 .

A rear bearing hole 321 is formed at the center of the rear bearing seat 32. A rear bearing 322 is provided in the rear bearing hole 321, and a wave spring 323 is sandwiched between the rear bearing hole 321 and the rear bearing 322. The rear bearing 322 is sleeved At the other end of the transmission shaft 24 relative to the front bearing 312, a rear washer 324 is sandwiched between the rear bearing 322 and the second surface of the flywheel 23. The rear washer 324 is also used to fill the axial gap. The rear bearing The seat 32 is locked to the rear support frame 42 by a plurality of screws 325 , and the stator 11 is locked to the rear bearing seat 32 by a plurality of bolts 326 .

In this preferred embodiment, the front support frame 41 is sheet-shaped and slightly T-shaped in appearance. The front support frame 41 forms a front through hole 411 near the top center of the T shape, and the rear support frame 42 is also the same. It is sheet-shaped and its appearance is slightly T-shaped. The rear support frame 42 is also formed with a rear through hole 421 corresponding to the front through hole 411 of the front support frame 41. Multiple holes are formed around the front support frame 41 and the rear support frame 42. Two locking holes 412, 422 are used for a plurality of locking bolts 43 to be pierced together and a nut 431 is combined at both ends of the locking bolts 43, so that the front support frame 41 and the rear support frame 42 are equiaxed. Please refer to Fig. 4 for cooperation, the front support frame 41 and the rear support frame 42 are respectively formed with four locking holes 412, 422 on both sides near the top of the T shape, and four locking bolts 43 and corresponding The nuts 431, wherein there are two locking bolts 43 and their nuts 431 above the center point A of the transmission shaft 24 or the pulley 26, and at least two locking bolts 43 and the corresponding nuts 431 is below the central point A of the transmission shaft 24 or pulley 26, thus, the corners of the front support frame 41 and the rear support frame 42 are respectively provided with locking holes 412, 422, locking bolts 43 and nuts 431 and mutually After the combination, the overall structural strength of the front support frame 41 and the rear support frame 42 can be strengthened, the mechanical structure rigidity after the front support frame 41 and the rear support frame 42 are relatively combined is improved, and it is not easy to produce a gap between the front support frame 41 and the rear support frame 42. Elastic deformation can prevent the front bearing 32 and the rear bearing 36 from receiving undue lateral force, and reduce the problem of force deformation of the front and rear support frames 41 and 42 .

The front washer 314 and the rear washer 324 serve to fill up the different axial dimension gaps between the flywheel 23 and the front bearing 312 and the rear bearing 322 respectively in terms of geometric functions, simplify the structure of the transmission shaft 24 and improve the commonality, and reduce the manufacturing cost. Process and cost purposes. This belt pulley 26 is for external device (as fitness equipment) input rotational force, to drive flywheel 23 and rotor 21 to rotate by drive shaft 24, this belt pulley 26, front bearing 312, front washer 314, flywheel 23, rear washer 324 and rear bearing 321 are adjacent to each other without axial clearance transmission structure, which is conducive to the continuous transmission of torque and structural stress of pulley 26 side tension, with the built-in wave spring 323 between the rear bearing 322 and the rear bearing seat 32, as the front bearing 312 and the preloading mechanism of the rear bearing 322 to strengthen the rigidity of the bearing set.

As can be seen from the above, technical features of the present invention are:

1. The stator 10 is combined with the rear bearing housing 32 , and the rear bearing housing 32 has a built-in wave spring 323 .

2. The rotor 21 is combined in the flywheel 23, and the flywheel 23 is combined with the transmission shaft 24. The second surface of the flywheel 23 is adjacent to the rear washer 324 and the rear bearing 322 in sequence. In addition, the rear bearing 322 is axially locked and connected to the rear bearing seat 32 combined.

3. The front bearing 312 is combined with the front bearing seat 31, the first surface of the flywheel 23 is adjacent to the front washer 314 and the front bearing 312 in sequence, and the pulley 26 is locked axially.

4. The front bearing seat 31 is combined with the front support frame 41, the rear bearing seat 32 is combined with the rear support frame 42, and the front support frame 41 and the rear support frame 42 are locked by multiple locking bolts 43 and multiple nuts 431 .

5. There are more than one locking holes 412, 422 around the front support frame 41 and the rear support frame 42, and there are locking bolts 43 and corresponding nuts 431. The locking holes 412, 422, locking bolts 43 And the nut 431 is higher than the center point of the transmission shaft 24 .

From the above, it can be seen that the components on the transmission shaft 24 are adjacent to each other and have no axial clearance transmission structure, and the axial preload mechanism is used to reduce the bearing clearance, so that it is difficult to produce the front support frame 41 and the rear support frame 42. Elastic deformation can avoid improper stress on the bearings of the front and rear bearing blocks 31, 32 and greatly improve the structural rigidity. In addition, the locking bolts 43 are distributed around the front support frame 41 and the rear support frame 42, and there are more than one The locking bolt 43 is higher than the central point of the drive shaft 24, which can reduce the doubts of the deformation of the front support frame 41 and the rear support frame 42 upper half and can improve the life of the parts, and solve the problem of poor structural rigidity and parts of the existing fitness equipment. The problem of low service life and energy consumption.

Also please refer to shown in Figures 5 and 6, the ratio of the number of slots 12 of the stator 10 to the number of magnetic poles of the rotor 21 is 6 or an integer ratio of 6, that is, the width range of each pair of permanent magnets 22 corresponds to 6 wire slots 12, the ratio can also be 12, 18 or 24; since each magnetic pole of the rotor 21 is made up of one or a pair of permanent magnets 22, each magnetic pole corresponds to the outer periphery of the rotor 21 of the 6 wire slots 12 It is a three-stage arc, including a first arc A1, a second arc A2 and a third arc A3, the first arc A1 is located between the second arc A2 and the third arc In the middle of A3, the design method of each arc edge will be described below.

As shown in Figure 5, five reference lines are formed between the two ends of each magnetic pole made up of permanent magnets 22, which are respectively a first reference line (L1), a second reference line (L2), a third reference line Line (L3), a fourth reference line (L4) and a fifth reference line (L5), the reference line is radially outward based on the center point CR of the rotor 21, wherein the first reference line L1 is the outward extension line of the center point CR of the rotor 21 passing through a tenth reference point P10 and a first reference point P1, and it is considered that the rotor 21 is facing the stator 10, wherein the tenth reference point (P10) Located at the center of one tooth comb of the stator, the first reference point (P1) is located at the first arc edge (A1) in the middle of the three-section arc edges of the rotor. The second reference line L2 is an outward extension line that is separated from the center point CR of the rotor 21 by a tooth pitch D of the stator 10 from the first reference line L1 . The third reference line L3 is the center point CR of the rotor 21 and is also an outward extension line apart from the first reference line L1 by a tooth pitch D of the stator 10, but the third reference line L3 and the second reference line L2 are on different sides. . The fourth reference line L4 is the center point CR of the rotor 21, the eighth reference point P8 at the edge of the other tooth comb of the stator 10, and the outward direction of the sixth reference point P6 at the corner of one of the permanent magnets 22. extension line. The fifth reference line L5 is the outward direction of the center point CR of the rotor 21, the ninth reference point P9 at the edge of another tooth comb of the stator 10, and the seventh reference point P7 at the corner of another permanent magnet 22. extension line. That is, the angle developed by the central point CR of the rotor 21 relative to the permanent magnet 22 and the three-section arc of the outer periphery of the rotor 21 is within the angle range between the fourth reference line L4 and the fifth reference line L5 .

The distance between the center point CR of the rotor 21 and the first reference point P1 of the first arc A1 is R1, the distance between the center C1 of the first reference circle S1 and the first reference point P1 of the first arc A1 is R2, and the fourth The distance between the center C4 of the reference circle S4 and the center point CR of the rotor 21 is R3; the radius of the fourth reference circle S4 is equal to R1+R2+R3. Wherein the (R1+R2)/R3≒0.56-0.68.

The intersection of the first reference line L1 and the fourth reference circle S4 is the center C1 of the first reference circle S1, the intersection of the second reference line L2 and the fourth reference circle S4 is the center C2 of the second reference circle S2, and the third reference line L3 and The intersection point of the fourth reference circle S4 is the center C3 of the third reference circle S3, and the first reference circle S1, the second reference circle S2 and the third reference circle S3 have the same radius R2.

The intersection point of the circumference of the first reference circle S1 and the circumference of the second reference circle S2 is the adjacent second reference point P2 between the first arc edge A1 and the second arc edge A2, and the circumference of the first reference circle S1 and the third reference circle S3 The intersection point of the circumference of is the adjacent third reference point P3 between the first arc side A1 and the third arc side A3. The intersection point of the circumference of the second reference circle S2 and the fourth reference line L4 is the fourth reference point P4 of the second arc edge A2, and the intersection point of the circumference of the third reference circle S3 and the fifth reference line L5 is the intersection point of the third arc edge A3. Fifth reference point P5.

Please refer to Fig. 7, the upper part of Fig. 7 is that the rotor 21 is not provided with a three-stage arc, and the lower part of Fig. 7 is provided with a three-stage arc. Total harmonic distortion percentage (Mag) analysis can be suppressed to 6.4%, which can significantly reduce 67% total harmonic distortion compared with the unused three-stage arc edge. By effectively suppressing the total harmonic distortion percentage, the power quality and power generation of power generation can be improved. efficiency.

Please refer to Figure 8, using the above-mentioned three-segment arc edge design (the solid line shown in the figure), the cogging torque can be suppressed to 0.39 per unit, compared with the non-use of the three-segment arc edge design (such as The dotted line shown in the figure) can be greatly reduced by 61%, and reducing the cogging torque can directly improve the comfort of use.

Please refer to shown in Fig. 9, carry out vibration measurement at this front support frame 41 near front bearing 32 places, Fig. 9 top is before not implementing, and Fig. 9 bottom is after implementing, its main natural resonant frequency can be improved to 46Hz before not implementing. After the implementation, the 68Hz has improved by more than 48%. If the vibration volume is compared at the natural resonance frequency of 46Hz, the vibration volume can be suppressed to less than 0.01g/N, which is an improvement of more than 67%. Life of rigid drive and support structures.

2 and 10, the rear support frame 42 is provided with a sensing circuit board 51, and the sensing circuit board 51 is provided with three sensors 511, and the sensors 511 are correspondingly arranged on the side wall of the rotor 21. Each pair of permanent magnets 22 is used to detect changes in their magnetic force. Since each pair of permanent magnets 22 is approximately distributed in concentric circles at the center point of the rotor 21, a first reference tangent T1 and a second reference tangent T2 are formed, wherein the first reference tangent T1 is inscribed in each pair of permanent magnets 22, The second reference tangent T2 is circumscribed on each pair of permanent magnets 22, the sensor 511 is separated from each pair of permanent magnets 22 by an appropriate axial distance, and distributed on the first reference tangent T1 or the second reference tangent T2 .

Thus, the sensor 511 can sense the axial leakage flux of each pair of permanent magnets 22 of the rotor 21, and provide the reference position sensing information of the magnetic poles of the rotor 20, so as to be used as a future product without significantly increasing the product cost. Parameter basis for high-efficiency power generation and utility parallel recovery control.

Regarding another embodiment of the front support frame 41 and the rear support frame 42 of the preferred embodiment of the present invention, please refer to shown in Fig. It is also in the shape of a sheet and its appearance is slightly inverted L-shaped. One of the locking bolts 43 and the nut 431 are located above the center point A of the drive shaft 24. See also Figure 12, the front support frame 41 and the two locking bolts 43 of the rear support frame 42 and the nut 431 are arranged above the central point A of the transmission shaft 24 .

From the above, it can be seen that the components on the transmission shaft 24 are adjacent to each other in a transmission structure without axial gap, and the rigidity of the transmission structure can be improved by using the axial preloading mechanism to reduce the gap between the bearings. In addition, the locking bolts 43 are distributed around the front and rear support frames 41, 42, reducing the deformation of the front and rear support frames 41, 42 and improving the life of the parts, solving the problem of poor structural rigidity and service life of the parts in existing fitness equipment Low and energy consumption issues.

Claims (15)

1. a kind of outward rotation type permanent magnet brushless electric machine, it is to be provided with a flywheel, a stator between support after support and one before one And a rotor, the flywheel has one first face and one second face, and first face is in closed, and the second face forms inner concavity For fixed rotor, the rotor ring is located at the outside of stator and can be relative to stator rotation, wherein the preceding support is with after A front-end bearing pedestal and a rear bearing block are respectively equipped with support, one end of the front-end bearing pedestal is connected with preceding support, it is described before Bearing block is provided with a fore bearing and more than one preceding packing ring, and the fore bearing and preceding packing ring are located in the of front-end bearing pedestal and flywheel Between simultaneously, one end of the rear bearing block is connected with stator and the other end is connected with after-poppet, and the rear bearing block and flywheel Bearing and more than one rear packing ring after a wavy spring, one are folded between second face, the fore bearing and rear bearing are in the lump Worn with a power transmission shaft among fore bearing and rear bearing, and power transmission shaft is connected with flywheel to make rotor relative stator rotate, preceding branch Frame and rear support is held around to locate provided with multiple engaging members to be combined with each other, and one of them is located at power transmission shaft above in association with part Central point top.

2. outward rotation type permanent magnet brushless electric machine according to claim 1, it is characterised in that：The rotor is provided with multiple permanent magnetics Iron, the corresponding rotor of magnetic pole scope of each permanent magnet is formed with three-stage arc side.

3. outward rotation type permanent magnet brushless electric machine according to claim 2, it is characterised in that：The flywheel is in the center in the first face Place is formed with an axis hole, and the axis hole is worn for power transmission shaft among axis hole, and to be respectively formed with one recessed for the axis hole of power transmission shaft and flywheel Groove, the common double end round key of grafting one of two grooves.

4. outward rotation type permanent magnet brushless electric machine according to claim 3, it is characterised in that：The front-end bearing pedestal of the preceding support A front axle bearing bore is formed with, the fore bearing pore volume puts fore bearing, and with a c-type button against the inner edge of the front axle bearing bore.

5. outward rotation type permanent magnet brushless electric machine according to claim 4, it is characterised in that：The rear bearing block of the rear support Bearing hole after being formed with one, bearing after the rear bearing hole is accommodating, and provided with wavy spring between the rear bearing and rear bearing hole.

6. outward rotation type permanent magnet brushless electric machine according to claim 5, it is characterised in that：The power transmission shaft is in preceding support The other end with respect to flywheel is provided with a belt pulley, and the power transmission shaft is respectively formed with a groove with belt pulley, and two grooves are inserted jointly Connect another double end round key.

7. outward rotation type permanent magnet brushless electric machine according to claim 6, it is characterised in that：The preceding support and rear support Multiple locking holes are formed around it respectively, the engaging member is lock bolt, and relative locking hole is worn jointly with lock bolt And if being be combined with each other with more than one nut.

8. outward rotation type permanent magnet brushless electric machine according to claim 7, it is characterised in that：The rear support is provided with a sensing Circuit board, the sensing circuit plate is provided with more than one sensor, each permanent magnet of the sensor respective rotor side wall.

9. outward rotation type permanent magnet brushless electric machine according to claim 8, it is characterised in that：The permanent magnet is with rotor The concentric circles APPROXIMATE DISTRIBUTION of heart point, the edge of each permanent magnet forms imaginary one first with reference to tangent line (T1) and one second reference Tangent line (T2), first is inscribed within each pair of permanent magnet with reference to tangent line (T1), and second is cut in each pair of permanent magnetic outside with reference to tangent line (T2) Iron, the sensor and each pair of permanent magnet certain axial distance, and be distributed in first with reference to tangent line (T1) or second apart With reference on tangent line (T2).

10. outward rotation type permanent magnet brushless electric machine according to any one of claim 1 to 9, it is characterised in that：Supported before described Frame and rear support difference are in the form of sheets and outward appearance is slightly into inverted L shape, and the locking hole of one of engaging member is located at the center of power transmission shaft The top of point.

11. outward rotation type permanent magnet brushless electric machine according to any one of claim 1 to 9, it is characterised in that：Supported before described Frame and rear support difference are in the form of sheets and outward appearance is slightly into T-shaped, and respectively at the T-shaped engaging member that is respectively arranged at two ends with, two knots The locking hole of component is located at the top of the central point of power transmission shaft.

12. the outward rotation type permanent magnet brushless electric machine according to any one of claim 2 to 9, it is characterised in that：The stator by Multiple rounded silicon steel sheets are formed by stacking, and each silicon steel sheet is formed with multiple radial wire casings, the wire casing in its peripheral region Slot number and rotor permanent magnet number of magnetic poles ratio be six ratio of integers.

13. outward rotation type permanent magnet brushless electric machine according to claim 12, it is characterised in that：The magnetic pole of each permanent magnet Five road reference lines are formed with the range of the corresponding rotor of scope, it is respectively one first reference line (L1), one second reference line (L2), one the 3rd reference line (L3), one the 4th reference line (L4) and one the 5th reference line (L5), first reference line (L1) is to turn Son central point (CR) by 1 the tenth reference point (P10) and the outside extension line by one first reference point (P1), wherein, Tenth reference point (P10) position is at the center of a wherein stripping fork for stator, and the first reference point (P1) position is in three sections of the rotor Formula arc while centre first arc while (A1).

14. outward rotation type permanent magnet brushless electric machine according to claim 13, it is characterised in that：Second reference line (L2) is The central point (CR) of rotor is with the first reference line (L1) at a distance of an outside extension line of the stator tooth away from (D)；3rd reference Line (L3) is the central point (CR) of rotor and same at a distance of an outside extension of the stator tooth away from (D) with the first reference line (L1) Line, but with the second reference line (L2) not homonymy.

15. outward rotation type permanent magnet brushless electric machine according to claim 14, it is characterised in that：4th reference line (L4) is The central point (CR) of rotor, position are in one the 8th reference point (P8) at another stripping fork edge of stator and position a permanent magnet wherein The outside extension line of one the 6th reference point (P6) of corner；5th reference line (L5) is the central point (CR) of rotor, position exists One the 7th reference point (P7) of one the 9th reference point (P9) at another stripping fork edge of stator and position in another permanent magnet corner Outside extension line, between the 4th reference line (L4) and the 5th reference line (L5) be three-stage arc side position.