CN114142632A

CN114142632A - A brushless motor with high torque and low temperature rise

Info

Publication number: CN114142632A
Application number: CN202111485470.8A
Authority: CN
Inventors: 宋近府; 骆敏舟; 卢钰
Original assignee: Nanjing Institute of Advanced Laser Technology
Current assignee: Nanjing Institute of Advanced Laser Technology
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-03-04
Anticipated expiration: 2041-12-07
Also published as: CN114142632B

Abstract

A brushless motor with high torque and low temperature rise, including a stator, the inner wall of the stator is provided with a surface-mounted rotor, the stator includes a stator iron core, the inner wall of the stator iron core is provided with a stator winding, and the rotor includes a rotor iron The outer wall of the rotor iron core is provided with an eccentric magnetic steel matched with the stator, and the outer wall of the stator is clamped with a cover plate; using finite element simulation analysis and reasonable design, the motor has large torque, strong overload capacity, and high temperature. Low rise, high production efficiency, low cost and other advantages, after the test and verification of the motor, the maximum temperature of the motor under the rated working state does not exceed 50 ℃ (temperature rise 30 ℃), and the maximum torque reaches more than 4 times the rated torque.

Description

Large-torque low-temperature-rise brushless motor

Technical Field

The invention belongs to the technical field of brushless motors, and particularly relates to a large-torque low-temperature-rise brushless motor.

Background

Brushless motors are increasingly widely used in modern life, and are widely used in aerospace systems, national defense and military equipment, scientific instruments, industrial automation equipment, transportation, medical instruments, computer information peripherals, office automation equipment, household appliances and civil consumer products. Many brushless direct current motor development, production, control and application personnel are engaged in China, and research is conducted by many colleges and universities and scientific research institutes around the hot spot of brushless motors and control.

At present, a frameless brushless torque motor applied to a cooperative robot requires a small motor volume and a large torque due to weight limitation, the maximum torque of a common brushless torque motor is only 2-3 times of the rated torque, and the temperature rise reaches 80 ℃ in a rated working state, so that the joint overload capacity of the robot is insufficient, and the heat is serious. Therefore, a large-torque low-temperature-rise brushless torque motor needs to be developed to meet the market requirements of a large-torque low-temperature-rise robot.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a large-torque low-temperature-rise brushless motor, which has the following specific technical scheme:

the utility model provides a big moment of torsion low temperature rises brushless motor, includes the stator, the inner wall of stator is provided with the table and pastes formula rotor, the stator includes stator core, the stator core inner wall is provided with stator winding, the rotor includes rotor core, the rotor core outer wall is provided with the eccentric magnet steel with stator matched with, the outer wall block of stator has the apron.

Furthermore, the outside cover of apron has the heat conduction ring, the heat conduction ring with connect through annular equidistance distributed's strengthening rib between the apron, the heat conduction ring outer wall is provided with the detachable heat-conducting plate.

Furthermore, a plurality of mounting holes are transversely formed in the longitudinal surface of the heat conducting plate, and the mounting holes are close to the end portions of the longitudinal surface of the heat conducting plate.

Furthermore, the heat conducting plate is connected with the heat conducting ring through a connecting part, the connecting part is rotated to connect the heat conducting ring and the heat conducting plate, and the transverse surface of the heat conducting plate is attached to the heat conducting ring.

Further, adapting unit includes recess one, L template, rotates piece, opening and spring one, open the bottom of heat-conducting plate has recess one, the inside symmetry of recess one is provided with the L template, the L template with be connected with spring one between the recess inner wall, promote the L template and rotate the piece contact, L template bottom is located a recess outside, the inner wall of heat conduction ring is opened there is the opening, the opening with strengthening rib dislocation set, L template bottom runs through the opening and can to the inside removal of heat conduction ring.

Further, it includes screw rod, rotatory piece and oval piece to rotate the piece, the top threaded connection of recess one has the screw rod, the screw rod top is located a recess outside and with rotatory piece fixed connection, screw rod bottom and oval piece fixed connection, oval piece be located between two L templates and with the L template contacts, rotatory piece with L template transverse surface has the interval.

Further, adapting unit still includes fixed block, bracing piece and elastic component, the heat-conducting plate bottom just is located a both sides fixedly connected with fixed block of recess, the fixed bracing piece that is provided with between the fixed block, the bracing piece is located recess below, the bracing piece runs through L template and spacing L template.

Further, the elastic component includes recess two, through-hole, lug, stopper, spacing and spring two, open the bottom surface tip of L template has recess two, open at the top of recess two has communicating through-hole, the radial length of through-hole is less than the inside interval of recess two, the inside of through-hole is provided with the lug, lug top cambered surface sets up, the spacing of the bottom outside fixedly connected with of recess two, spacing lug tip, the outer wall fixedly connected with stopper of lug, the stopper can get into in the recess two, just the stopper with be connected with spring two between the spacing.

Furthermore, connecting holes are formed in the two sides of the opening and on the surface of the heat conducting ring, and the connecting holes are matched with the convex blocks.

Furthermore, the connecting part comprises a connecting bolt, and the heat conducting plate is fixedly connected with the heat conducting ring through the connecting bolt.

The invention has the beneficial effects that:

1. by adopting finite element simulation analysis and reasonable design, the motor has the advantages of large torque, strong overload capacity, low temperature rise, high production efficiency, low cost and the like, and the test and verification of the motor prove that the highest temperature of the motor under a rated working state does not exceed 50 ℃ (the temperature rise is 30 ℃), and the maximum torque reaches more than 4 times of the rated torque;

2. the cooperation that sets up heat conduction ring and heat-conducting plate can improve the radiating efficiency of motor, and can dismantle between heat conduction plate and the heat conduction ring and be connected, can use or have the usage space to install the heat conduction plate when need not to use or unconditionally use, can dismantle and get off, and the annular distribution of heat conduction plate makes and has the interval between the heat conduction plate, also convenient heat dissipation.

Drawings

Fig. 1 shows a schematic structural diagram of a large-torque low-temperature-rise brushless motor according to the present invention;

FIG. 2 is a schematic view of the heat-conducting plate and heat-conducting ring structure of the present invention;

FIG. 3 shows a schematic view of the construction of the mounting hole of the present invention;

FIG. 4 shows a schematic structural view of the attachment ring of the present invention;

FIG. 5 is a schematic view showing the construction of the rotating member of the present invention;

FIG. 6 shows an enlarged view at A in FIG. 3;

FIG. 7 shows a schematic structural view of the connecting bolt of the present invention;

fig. 8 shows a schematic view of the structure of the connecting bolt and the heat-conducting plate of the present invention;

shown in the figure: 1. a stator; 11. a stator core; 12. a stator winding; 2. a rotor; 21. a rotor core; 22. eccentric magnetic steel; 3. a cover plate; 4. a heat conducting ring; 5. reinforcing ribs; 6. a heat conducting plate; 7. mounting holes; 8. a connecting member; 81. a first groove; 82. an L-shaped plate; 83. a rotating member; 831. a screw; 832. rotating the block; 833. an elliptical block; 84. an opening; 85. a first spring; 86. a fixed block; 87. a support bar; 88. an elastic member; 881. a second groove; 882. a through hole; 883. a bump; 884. a limiting block; 885. a limiting frame; 886. a second spring; 887. connecting holes; 80. and connecting the bolts.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a big moment of torsion low temperature rise brushless motor, including stator 1, the inner wall of stator 1 is provided with the table and pastes formula rotor, stator 1 includes stator core 11, stator core 11 inner wall is provided with stator winding 12, rotor 2 includes rotor core 21, rotor core 21 outer wall is provided with the eccentric magnet steel 22 with stator 1 matched with, stator 1's outer wall block has apron 3.

A proper electromagnetic method can be determined through finite element simulation analysis, reasonable slot pole matching is adopted to improve torque and reduce vibration noise, silicon steel sheets of a stator core 11 adopt silicon steel sheets with thinner thickness to reduce loss and reduce temperature rise, a surface-mounted rotor is adopted to improve torque, eccentric magnetic steel 22 is adopted to reduce torque fluctuation, a stator winding 12 adopts a centralized winding to reduce the manufacturing cost of a stator 1, a copper wire adopts reasonable wire diameter and number of turns to reduce temperature rise, and the ratio of the wire diameter sectional area (mm2) of the copper wire to power (kW) is 1.7-2.

As shown in fig. 2, the cover plate 3 is externally sleeved with a heat conducting ring 4, the heat conducting ring 4 is connected with the cover plate 3 through annular reinforcing ribs 5 distributed at equal intervals, and the outer wall of the heat conducting ring 4 is provided with a detachable heat conducting plate 6.

The diameter of heat conduction ring 4 is greater than the diameter of apron 3, therefore heat conduction ring 4 can be located apron 3's surface, apron 3, reinforcing rib 5 also can adopt the heat conduction material, apron 3 and heat conduction ring 4 are connected to reinforcing rib 5, can make and keep the interval between heat conduction ring 4 and the apron 3, thereby make and have the space between heat conduction ring 4 and the apron 3, convenient heat dissipation, the longitudinal section of heat-conducting plate 6 is similar to the L type, detachable connection between heat-conducting plate 6 and the heat conduction ring 4, can be according to the actual space decision whether to install heat-conducting plate 6.

As shown in fig. 3, the heat-conducting plate 6 is transversely provided with a plurality of mounting holes 7 on the longitudinal surface thereof, and the mounting holes 7 are provided near the ends of the longitudinal surface of the heat-conducting plate 6.

The quantity of mounting hole 7 is two at least, be located the vertical surface tip of heat-conducting plate 6, the setting of mounting hole 7 not only reduces the weight of heat-conducting plate 6, also be convenient for the air to pass when having the circulation of air simultaneously, thereby dispel the heat, mounting hole 7 also can make the bolt pass simultaneously, when needs are installed motor itself, can pass mounting hole 7 through the bolt, also can be with pedestal mounting on heat-conducting plate 6, thereby make the motor can place, satisfy the multiple demand of installation.

As shown in fig. 2, the heat conducting plate 6 is connected to the heat conducting ring 4 through a connecting member 8, the heat conducting ring 4 is connected to the heat conducting plate 6 by rotating the connecting member 8, and the heat conducting plate 6 is attached to the heat conducting ring 4 on the lateral surface.

Adapting unit 8 realizes the connection of dismantling of heat-conducting plate 6 and heat-conducting ring 4, when needs heat-conducting plate 6, can install heat-conducting plate 6 in heat-conducting ring 4's surface, when not needing, can not install, reduce the space and occupy, consequently, can install heat-conducting plate 6 according to the actual demand, when heat-conducting plate 6 is installed in heat-conducting ring 4 surface, heat-conducting plate 6's horizontal surface bottom laminating in heat-conducting ring 4, therefore the heat on heat-conducting ring 4 surface can be conducted to heat-conducting plate 6 on, further improve the radiating effect.

As shown in fig. 3 and 4, the connecting member 8 includes a first groove 81, a first L-shaped plate 82, a rotating member 83, an opening 84, and a first spring 85, the first groove 81 is formed at the bottom of the heat conducting plate 6, the first L-shaped plate 82 is symmetrically disposed inside the first groove 81, the first spring 85 is connected between the first L-shaped plate 82 and the inner wall of the first groove 81, the first L-shaped plate 82 is pushed to contact with the rotating member 83, the bottom end of the first L-shaped plate 82 is located outside the first groove 81, the opening 84 is formed in the inner wall of the heat conducting ring 4, the opening 84 and the reinforcing rib 5 are arranged in a staggered manner, and the bottom end of the first L-shaped plate 82 penetrates through the opening 84 and can move towards the inside of the heat conducting ring 4.

Recess 81 is located the horizontal surface bottom of heat-conducting plate 6, the height of recess 81 is less than L template 82, consequently, the top and the recess 81 top contact of L template 82, L template 82 bottom is located the recess 81 outside, rotate 83 and heat-conducting plate 6 threaded connection, the middle part of recess 81 is opened has and is rotated 83 bolted connection's screw, the rotation of rotating the piece 83 can change the interval of two L templates 82, after L template 82 passed opening 84, increase L template 82's interval, can make L template 82's tip to the inside horizontal linear movement of heat-conducting plate 6, when L template 82 both ends interval is greater than opening 84, heat-conducting plate 6 is difficult for breaking away from opening 84, thereby realize being connected of heat-conducting plate 6 and heat-conducting ring 4.

In the initial state, the distance between the two L-shaped plates 82 is small, the distance between the L-shaped plates 82 is smaller than the width of the opening 84, so that the L-shaped plates 82 can pass through the opening 84, and the first spring 85 pushes the L-shaped plates 82 to move towards the middle, so that the L-shaped plates 82 can be always in contact with the rotating piece 83.

As shown in fig. 5, the rotating member 83 includes a screw 831, a rotating block 832 and an elliptical block 833, the top of the first groove 81 is connected with the screw 831 through a thread, the top end of the screw 831 is located outside the first groove 81 and fixedly connected with the rotating block 832, the bottom end of the screw 831 is fixedly connected with the elliptical block 833, the elliptical block 833 is located between the two L-shaped plates 82 and contacts with the L-shaped plates 82, and the transverse surfaces of the rotating block 832 and the L-shaped plates 82 have a space.

Screw 831 and the screw threaded connection at a recess 81 top, screw 831 top and rotatory piece 832 fixed connection, can drive screw 831 rotatory removal through rotatory piece 832, rotatory piece 832 is located the outside of a recess 81 and is located its top, oval piece 833 is located the inside of a recess 81, initial condition is down, L template 82 contacts with the little lateral wall in oval piece 833 interval, when L template 82 contacts with the big lateral wall in oval piece 833 interval, oval piece 833 can increase the interval of two L templates 82, and when L template 82 interval increases, oval piece 833 rotates the removal downwards, rotatory piece 832 and L template 82 interval shrink this moment.

As shown in fig. 3, the connecting member 8 further includes a fixing block 86, a supporting rod 87 and an elastic member 88, the fixing block 86 is fixedly connected to the bottom end of the heat conducting plate 6 and located on two sides of the first groove 81, the supporting rod 87 is fixedly arranged between the fixing blocks 86, the supporting rod 87 is located below the first groove 81, and the supporting rod 87 penetrates through the L-shaped plate 82 and limits the L-shaped plate 82.

The bottom of L template 82 and heat-conducting plate 6 bottom interval and the highly uniform of fixed block 86, consequently, fixed block 86 is fixed in heat-conducting plate 6 bottom, and fixed block 86 bottom and L template 82 contact, elastic component 88 is located L template 82, and lean on to fixed block 86 department, therefore elastic component 88 receives the blockking of fixed block 86 to be located L template 82 always under the initial condition, bracing piece 87 is fixed in between two fixed blocks 86, L template 82 surface is opened has the hole that can make bracing piece 87 pass, can not only support L template 82, also spacing to L template 82 simultaneously, make L template 82 keep the linear movement of horizontal direction, and the height of fixed block 86 is unanimous with the thickness of heat-conducting ring 4, consequently, when L template 82 removed, elastic component 88 can follow fixed block 86 and remove to the inner wall of heat-conducting ring 4 and rather than the contact.

As shown in fig. 6, the elastic member 88 includes a second groove 881, a second through hole 882, a bump 883, a limiting block 884, a limiting frame 885 and a second spring 886, the second groove 881 is opened at the bottom end of the L-shaped plate 82, a communicating through hole 882 is opened at the top of the second groove 881, the radial length of the through hole 882 is less than the internal interval of the second groove 881, the bump 883 is arranged inside the through hole 882, the top arc surface of the bump 883 is arranged, the limiting frame 885 is fixedly connected to the bottom outer side of the second groove 881, the end of the limiting bump 883, the limiting block 884 is fixedly connected to the outer wall of the bump 883, the limiting block 884 can enter the second groove 881, and the second spring 886 is connected between the limiting block 884 and the limiting frame 885.

The second groove 881 is located the end of the bottom end of the L-shaped plate 82, the through hole 882 communicates with the second groove 881 and is disposed, the cross-section of the limiting frame 885 is similar to a U shape, one end of the bump 883 is located in the through hole 882, the other end passes through the second groove 881 and is located in the limiting frame 885, the limiting block 884 is fixed on the outer surface of the bump 883, the second spring 886 can push the limiting block 884, thereby the end of the bump 883 moves to the outside of the through hole 882, but the bump 883 is located in the through hole 882 in the initial state, and the arc surface of the end of the bump 883 located in the through hole 882 is convenient to contact with the heat-conducting plate 6, and friction between the bump 883 and the heat-conducting plate 6 is reduced.

As shown in fig. 4, connection holes 887 are formed on both sides of the opening 84 and on the surface of the heat conduction ring 4, and the connection holes 887 are matched with the protrusions 883.

The diameter of connecting hole 887 matches with the diameter of lug 883, when L template 82 moves to heat conduction ring 4 inside, when elastic member 88 breaks away from fixed block 86, elastic member 88 moves to the 4 inner walls of heat conduction ring, and receive the separation of the 4 inner walls of heat conduction ring, lug 883 is located through-hole 882 always, when L template 82 tip removed to connecting hole 887 department, connecting hole 887 can be passed to lug 883's tip, thereby it is spacing to L template 82, the unable linear movement of L template 82 this moment, reach and strengthen being connected the steadiness between heat conduction plate 6 and the heat conduction ring 4.

As shown in fig. 7 and 8, the connecting member 8 includes a connecting bolt 80, and the heat-conducting plate 6 and the heat-conducting ring 4 are fixedly connected by the connecting bolt 80.

The heat conducting plate 6 is provided with screw holes matched with the connecting bolts 80, the bolts can penetrate through the openings 84, and the connecting bolts 80 can connect and fix the heat conducting plate 6 and the heat conducting ring 4 to realize detachable connection.

The working principle is as follows: the heat conduction ring 4 is added on the outer wall of the cover plate 3 to improve the heat dissipation efficiency, when the heat conduction plate 6 is required to be installed, the heat conduction plate 6 can be installed in a plurality of ways, one connecting part 8 is directly connected through the connecting bolt 80, the structure is simple, the installation operation is troublesome, and the possibility of looseness exists after long-time use, the other connecting part 8 is connected through limit matching, the limit block 884 rotates the rotating block 832 to enable the oval block 833 to move downwards, the L-shaped plate 82 is contacted with the side wall with large distance between the oval blocks 833, the spring I85 is in a compressed state, the bottom end of the L-shaped plate 82 moves outwards and moves to the connecting hole 887, the lug 883 can move outwards and can pass through the connecting hole 887 and is limited by the limit block 884, when the limit block 884 enters the groove II 881, the lug 883 cannot move towards the connecting hole 887 continuously, at the moment, the double-layer limitation of the L-shaped plate 82 and the lug 883 completes the connection of the heat conduction plate 6 and the heat conduction ring 4, the mode structure is complicated, but the installation operation is simple, and the loosening condition is not easy to occur.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A brushless motor with high torque and low temperature rise, characterized in that it comprises a stator (1), the inner wall of the stator (1) is provided with a surface-mounted rotor (2), and the stator (1) comprises a stator iron core (11), the stator winding (12) is provided on the inner wall of the stator iron core (11), the rotor (2) includes a rotor iron core (21), and the outer wall of the rotor iron core (21) is provided with a stator (12) on the outer wall. ) matched with the eccentric magnetic steel (22), and a cover plate (3) is engaged with the outer wall of the stator (1).

2 . The brushless motor with high torque and low temperature rise according to claim 1 , wherein a heat conducting ring ( 4 ) is sleeved outside the cover plate ( 3 ), and the heat conducting ring ( 4 ) is connected to the The cover plates (3) are connected by reinforcing ribs (5) distributed at an equal distance in a ring shape, and a detachable heat conduction plate (6) is provided on the outer wall of the heat conduction ring (4).

3. The brushless motor with high torque and low temperature rise according to claim 2, characterized in that: a plurality of mounting holes (7) are laterally opened on the longitudinal surface of the heat conducting plate (6), and the mounting holes (7) Close to the end of the longitudinal surface of the thermally conductive plate (6).

4. A high-torque low-temperature rise brushless motor according to claim 3, characterized in that: the heat-conducting plate (6) and the heat-conducting ring (4) are connected by a connecting member (8), and are connected in rotation. The component (8) connects the heat-conducting ring (4) and the heat-conducting plate (6), and the lateral surface of the heat-conducting plate (6) is attached to the heat-conducting ring (4).

5 . The brushless motor with high torque and low temperature rise according to claim 4 , wherein the connecting member ( 8 ) comprises a groove one ( 81 ), an L-shaped plate ( 82 ), and a rotating member ( 83 ). 6 . , opening (84) and spring one (85), the bottom of the heat conducting plate (6) is provided with a groove one (81), the interior of the groove one (81) is symmetrically provided with an L-shaped plate (82), A spring (85) is connected between the L-shaped plate (82) and the inner wall of the first groove (81), which pushes the L-shaped plate (82) to contact the rotating member (83), and the L-shaped plate (82) ) bottom end is located outside the groove one (81), the inner wall of the heat conducting ring (4) is provided with an opening (84), the opening (84) and the reinforcing rib (5) are dislocated, and the L The bottom end of the mold plate (82) penetrates through the opening (84) and can move toward the inside of the heat conducting ring (4).

6 . The brushless motor with high torque and low temperature rise according to claim 5 , wherein the rotating member ( 83 ) comprises a screw rod ( 831 ), a rotating block ( 832 ) and an elliptical block ( 833 ). The top of the first groove (81) is screwed with a screw (831), the top of the screw (831) is located outside the first groove (81) and is fixedly connected with the rotating block (832), and the bottom of the screw (831) The end is fixedly connected with the elliptical block (833), the elliptical block (833) is located between the two L-shaped plates (82) and is in contact with the L-shaped plate (82), and the rotating block (832) is connected to the The lateral surfaces of the L-shaped plate (82) are spaced apart.

7 . The brushless motor with high torque and low temperature rise according to claim 6 , wherein the connecting member ( 8 ) further comprises a fixing block ( 86 ), a support rod ( 87 ) and an elastic member ( 88 ), 8 . A fixing block (86) is fixedly connected to the bottom end of the heat conducting plate (6) and located on both sides of the first groove (81), and a support rod (87) is fixedly arranged between the fixing blocks (86). A support rod (87) is located under the first groove (81), and the support rod (87) penetrates the L-shaped plate (82) and limits the L-shaped plate (82).

8 . The brushless motor with high torque and low temperature rise according to claim 7 , wherein the elastic member ( 88 ) comprises two grooves ( 881 ), through holes ( 882 ), bumps ( 883 ), 8 . A limit block (884), a limit frame (885) and a second spring (886), the bottom end of the L-shaped plate (82) is provided with a second groove (881), and the second groove (881) is A through hole (882) communicated on the top is opened, the radial length of the through hole (822) is smaller than the inner spacing of the second groove (881), and the through hole (882) is provided with a bump (883) inside, The top end of the protruding block (883) is provided with an arc surface, the bottom outer side of the second groove (881) is fixedly connected to the limiting frame (885), the end of the limiting protruding block (883), the end of the protruding block (883) The outer wall is fixedly connected with a limit block (884), the limit block (884) can enter the second groove (881), and the limit block (884) and the limit frame (885) are connected with a Spring Two (886).

9 . The brushless motor with high torque and low temperature rise according to claim 8 , wherein connecting holes ( 887 ) are opened on both sides of the opening ( 84 ) and located on the surface of the heat conducting ring ( 4 ). 10 . The connecting hole (887) is adapted to the protrusion (883).

10 . The high-torque low-temperature rise brushless motor according to claim 4 , wherein the connecting member ( 8 ) comprises a connecting bolt ( 80 ), the heat-conducting plate ( 6 ) and the heat-conducting ring ( 10 . 10 . 4) are fixedly connected by connecting bolts (80).