A low-voltage, high-current, high-power-density permanent magnet synchronous motor

Abstract

The present invention discloses a low-voltage, high-current, high-power-density permanent-magnet synchronous motor, comprising: a motor, which provides power to the outside; a circulating heat sink, which is arranged on the motor, and comprises a heat sink extrusion, an internal and external circulating heat sink, and a heat sink transmission, wherein the heat sink extrusion is extruded on the motor to provide heat sink liquid, and the internal and external circulating heat sink is used for the extruded heat sink liquid to circulate on the motor to conduct the heat inside the motor, and the heat sink transmission applies an extrusion force on the heat sink extrusion on the motor; a brake, which is arranged on the motor, and comprises a brake friction member and a brake transmission member, and the brake friction member is driven by the connected brake transmission member on the motor to brake the motor. The present invention has a compact structure, a small volume, high heat dissipation efficiency, high emergency braking efficiency, and high safety in use.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a low-voltage, high-current, high-power-density permanent-magnet synchronous motor. Background Art

[0002] With the rapid development of motor systems, permanent magnet synchronous motors have the advantages of high power density, fast response and high reliability, so AC motor systems are also becoming more and more widely used. In recent years, more and more occasions such as field operations, AGV logistics carts (Automated Guided Vehicle), medical robots, etc., have begun to use low-voltage and high-current permanent magnet synchronous motors for driving. Low-voltage and high-current motors may cause the following problems during the design process:

[0003] (1) Under the conditions of the same driving power and load characteristics, the phase current of the low-voltage motor driver is much larger than that of the high-voltage motor driver, and the current flowing through the components is 5-10 times that of the high-voltage motor driver. This causes the hardware part to have problems such as increased circuit power consumption, increased voltage drop of power devices, increased harmonic components of output current, and excessive heat generation, affecting the reliability of the overall operation;

[0004] (2) Low-voltage, high-current motors are used in mobile or small devices, which greatly limits the size and mass of the motors. When the size is reduced, problems such as increased signal interference and difficulty in heat dissipation will occur, resulting in unstable drive operation;

[0005] (3) When an abnormal problem occurs during the operation of an existing permanent magnet synchronous motor, such as an abnormal power failure of the motor, the traditional control circuit cannot perform emergency braking on the motor, causing the motor to suffer serious damage during the power failure. Summary of the invention

[0006] In order to overcome the above defects, the present invention provides a low-voltage, high-current, high-power density permanent magnet synchronous motor, which specifically adopts the following technical solutions:

[0007] A low-voltage, high-current, high-power-density permanent-magnet synchronous motor, comprising:

[0008] A motor that provides power to the outside;

[0009] a circulating heat sink, which is arranged on the motor, and comprises a heat sink extrusion member, an internal-external circulation heat sink member and a heat sink transmission member, wherein the heat sink extrusion member is extruded on the motor to provide heat sink liquid, the internal-external circulation heat sink member allows the extruded heat sink liquid to flow on the motor to conduct the heat inside the motor, and the heat sink transmission member applies an extrusion force on the heat sink extrusion member on the motor;

[0010] The brake member is arranged on the motor and comprises a brake friction member and a brake transmission member. The brake friction member is driven by the brake transmission member connected to the motor to brake the motor.

[0011] Preferably, the heat dissipation extrusion comprises a first heat dissipation extrusion and a second heat dissipation extrusion, and the first heat dissipation extrusion and the second heat dissipation extrusion are both arranged on the stator of the motor; the first heat dissipation extrusion comprises an extruded inner tube, an extruded outer tube, a liquid-cooled heat dissipation bladder and a reset spring, one end face of the extruded inner tube is arranged on one end face of the stator core of the stator, one end of the extruded outer tube is slidably mounted on the other end of the extruded inner tube, the liquid-cooled heat dissipation bladder is arranged on the extruded inner tube and the extruded outer tube, and the reset spring is arranged on the liquid-cooled heat dissipation bladder.

[0012] Preferably, the first heat dissipating extrusion also includes a planar sliding member, which is arranged on the extruded outer tube. The planar sliding member includes a planar sliding plate and a roller needle. One end face of the planar sliding plate is fixedly arranged on the other end face of the extruded outer tube, and the roller needle is arranged on the other end face of the planar sliding plate, so that the roller needle can roll circumferentially on the planar sliding plate.

[0013] Preferably, the liquid-cooled heat dissipation bag is in the shape of a sealed corrugated tube, the liquid-cooled heat dissipation bag is embedded in the extruded inner tube and the extruded outer tube, the liquid-cooled heat dissipation bag is filled with heat dissipation liquid, and the return spring is installed in the liquid-cooled heat dissipation bag.

[0014] Preferably, the second heat dissipation extrusion piece has the same structure as the first heat dissipation extrusion piece, and the first heat dissipation extrusion piece and the second heat dissipation extrusion piece are distributed along the circumference of the stator core at a predetermined interval.

[0015] Preferably, the internal and external circulation heat dissipation element includes a first liquid-cooled external radiator and a second liquid-cooled external radiator, and the first liquid-cooled external radiator and the second liquid-cooled external radiator are both arranged on the casing of the motor; the first liquid-cooled external radiator is sleeved on the outer wall of the casing, one end of the first liquid-cooled external radiator is through-connected with one end of the first heat dissipation hole in the stator core, the first heat dissipation hole extends inside the stator core, the other end of the first liquid-cooled external radiator is through-connected with a first heat dissipation relay tube, the free end of the first heat dissipation relay tube is through-connected with the side wall of the liquid-cooled heat dissipation bag of the second heat dissipation extrusion piece, the first heat dissipation relay tube is provided with a first one-way valve, the other end of the first heat dissipation hole is through-connected with a second heat dissipation relay tube, the other end of the second heat dissipation relay tube is through-connected with the end surface of the liquid-cooled heat dissipation bag, and the second heat dissipation relay tube is provided with a second one-way valve.

[0016] Preferably, the second liquid-cooled external radiator is sleeved on the outer wall of the casing, and one end of the second liquid-cooled external radiator is through-connected with one end of the second heat dissipation hole in the stator core, the other end of the second liquid-cooled external radiator is through-connected with a third heat dissipation relay tube, the free end of the third heat dissipation relay tube is through-connected with the side wall of the liquid-cooled heat dissipation bag, and the third heat dissipation relay tube is provided with a third one-way valve; the other end of the second heat dissipation hole is through-connected with a fourth heat dissipation relay tube, the other end of the fourth heat dissipation relay tube is through-connected with the end surface of the liquid-cooled heat dissipation bag of the second heat dissipation extrusion, and the fourth heat dissipation relay tube is provided with a fourth one-way valve.

[0017] Preferably, the first heat dissipation holes include a main heat dissipation hole and a heat dissipation bypass hole, both ends of the main heat dissipation hole are respectively connected with the liquid cooling heat dissipation bag and the internal and external circulation heat dissipation elements, and both ends of the heat dissipation bypass hole are respectively connected with both ends of the heat dissipation main hole, so that the heat dissipation bypass hole is connected in parallel with the middle section of the heat dissipation main hole, and the heat dissipation bypass hole extends in a curve to the stator core where the stator coil of the stator is wound; the circulation heat dissipation element is provided with multiple sets, and the multiple sets of the circulation heat dissipation elements are distributed circumferentially of the stator core.

[0018] Preferably, the heat dissipation transmission member includes a transmission driving wheel, a transmission driven wheel, a transmission extrusion wheel and a transmission extrusion plate, the transmission driving wheel is fixedly sleeved on the rotating shaft of the rotor of the motor, the transmission driven wheel is arranged on the driven transmission frame, and the transmission driven wheel is meshed with the transmission driving wheel, the other end of the driven transmission frame is arranged on the stator core, and a plurality of the transmission driven wheels are circumferentially distributed around the transmission driving wheel; the transmission extrusion wheel is in the shape of an internal gear, the transmission extrusion wheel is simultaneously sleeved outside a plurality of the transmission driven wheels, and the transmission extrusion wheel is meshed with the transmission driven wheels, the outer ring of the transmission extrusion wheel is embedded in a first annular groove on the inner wall of the casing, an annular ring is arranged on one end of the transmission extrusion wheel, and the free end of the annular ring is slidably embedded in a second annular groove on the inner wall of one end face of the casing, the transmission extrusion plate is in the shape of an arc block, and the transmission extrusion plate is arranged on the other end face of the transmission extrusion wheel for extruding the planar sliding member; a plurality of the transmission extrusion plates are evenly distributed along the circumference of the transmission extrusion wheel.

[0019] Preferably, the brake friction member includes a brake transmission shaft, a first friction plate and a second friction plate, one end of the brake transmission shaft passes through an end surface of the casing, and multiple brake transmission shafts are evenly distributed circumferentially along the axis of the casing; the first friction plate is arranged on one end of multiple brake transmission shafts, the second friction plate is arranged on an end surface of the transmission driving wheel, and the second friction plate corresponds to the first friction plate; the brake transmission member includes a force application tube, a transmission tube and a magnetic coil, one end of the force application tube is arranged on an end surface of the casing, one end of the transmission tube is arranged on the other end of multiple brake transmission shafts, the magnetic coil is embedded in the inner wall of the transmission tube, and the magnetic coil is sleeved outside the force application tube.

[0020] The present invention has at least the following beneficial effects:

[0021] 1) The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention has a compact structure, a small volume, high heat dissipation efficiency, high emergency braking efficiency, and high safety in use;

[0022] 2) The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention is provided with a heat dissipation extrusion part, an internal-external circulation heat dissipation part and a heat dissipation transmission part. The heat dissipation transmission part periodically extrude the heat dissipation extrusion part by means of the rotation of the motor, so that the heat dissipation liquid in the heat dissipation extrusion part flows into the internal-external circulation heat dissipation part to cool the inside of the motor, which significantly improves the compactness and heat dissipation efficiency of the motor and reduces the size of the motor;

[0023] 3) The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention is provided with a brake component, which brakes the rotor of the motor by cooperating with the heat dissipation transmission component, so as to significantly improve the emergency braking efficiency and safety of the motor.

[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention;

[0026] Figure 2 This is a front view of the low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention;

[0028] Figure 4 The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention Figure 2Schematic diagram of the three-dimensional structure of the cross section in the AA direction;

[0029] Figure 5 The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention Figure 1 Schematic diagram of the three-dimensional structure of the cross section in the middle BB direction;

[0030] Figure 6 The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention Figure 1 Schematic diagram of the three-dimensional structure in the cross section along the CC direction;

[0031] Figure 7 The low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention Figure 1 Schematic diagram of the three-dimensional structure of the cross section in the middle DD direction;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the first heat dissipation extrusion member in the low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention;

[0033] Fig. 9 It is a schematic diagram of the longitudinal cross-section of the three-dimensional structure of the first heat dissipation extrusion member in the low-voltage, high-current, high-power-density permanent-magnet synchronous motor of the present invention;

[0034] Fig.10 It is a schematic diagram of the three-dimensional structure of the plane sliding part in the low-voltage, high-current and high-power density permanent magnet synchronous motor of the present invention.

[0035] Wherein: 1- housing, 2- rotor, 3- stator, 4- liquid cooling heat dissipation bag, 5- return spring, 6- extrusion inner tube, 7- extrusion outer tube, 8- plane sliding plate, 9- needle roller, 10- first liquid cooling external radiator, 11- second liquid cooling external radiator, 12- first heat dissipation hole, 13- second heat dissipation hole, 14- transmission driving wheel, 15- transmission driven wheel, 16- transmission extrusion wheel, 17- transmission extrusion plate, 18- driven transmission frame, 19- annular ring, 20- brake transmission shaft, 21- first friction plate, 22- second friction plate, 23- force tube, 24- transmission tube, 25- magnetic coil. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0037] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0038] according to Figure 1-Figure 10 As shown, a low-voltage, high-current, high-power-density permanent-magnet synchronous motor includes a motor, a circulating heat sink and a brake, and the circulating heat sink and the brake are both arranged on the motor. The motor includes a housing 1, a rotor 2 and a stator 3, and the rotor 2 and the stator 3 are both arranged on the housing 1. The two ends of the rotating shaft of the rotor 2 are respectively penetrated and arranged on the two end surfaces of the housing 1, and the axis of the rotor 2 coincides with the axis of the housing 1, so that the rotor 2 can rotate freely in the housing 1. The stator 3 is fixedly embedded in the housing 1, and the stator 3 is sleeved outside the rotor 2.

[0039] The circulating heat sink includes a heat sink extrusion, an internal and external circulation heat sink and a heat sink transmission part. The heat sink extrusion, the internal and external circulation heat sink and the heat sink transmission part are all arranged on the motor. The heat sink extrusion includes a first heat sink extrusion and a second heat sink extrusion. The first heat sink extrusion and the second heat sink extrusion are both arranged on the stator 3. The first heat sink extrusion includes an extruded telescopic tube, a liquid cooling heat sink bladder 4 and a reset spring 5. The extruded telescopic tube is arranged on the stator 3. The liquid cooling heat sink bladder 4 is arranged on the extruded telescopic tube. The reset spring 5 is arranged on the liquid cooling heat sink bladder 4. The extruded telescopic tube includes an extruded inner tube 6 and an extruded outer tube 7. One end face of the extruded inner tube 6 is closed. One end face of the extruded inner tube 6 is horizontally fixedly arranged on one end face of the stator core of the stator 3, and the extruded inner tube 6 is non-contact with the stator coil on the stator 3. The inner diameter of the extruded outer tube 7 is not less than the outer diameter of the extruded inner tube 6. One end of the extruded outer tube 7 is slidably mounted on the other end of the extruded inner tube 6, so that the extruded outer tube 7 can move axially toward the extruded inner tube 6 to shorten the distance between the other side of the extruded inner tube 6 and the other end face of the extruded outer tube 7. As an option, the extruded telescopic tube also includes a plane sliding member, which includes a plane sliding plate 8 and a needle roller 9. One end face of the plane sliding plate 8 is fixedly arranged on the other end face of the extruded outer tube 7. The needle roller 9 is arranged on the other end face of the plane sliding plate 8, so that the needle roller 9 can roll circumferentially on the plane sliding plate 8. The extruded telescopic tube is directly connected to the heat dissipation transmission member through the needle roller 9 to reduce the lateral friction between the extruded telescopic tube and the heat dissipation transmission member, thereby reducing the lateral friction of the heat dissipation transmission member on the extruded telescopic tube when the extruded telescopic tube is extruded, and improving the extrusion stability of the extruded telescopic tube.

[0040] The liquid cooling heat dissipation bag 4 is in the shape of a sealed corrugated tube, and the natural length of the liquid cooling heat dissipation bag 4 is not less than the sum of the lengths of the extruded inner tube 6 and the extruded outer tube 7. The liquid cooling heat dissipation bag 4 is embedded in the extruded inner tube 6 and the extruded outer tube 7, so that when the extruded outer tube 7 is extruded toward the extruded inner tube 6, the liquid cooling heat dissipation bag 4 is extruded. The liquid cooling heat dissipation bag 4 is filled with heat dissipation liquid, and when the liquid cooling heat dissipation bag 4 is extruded, the heat dissipation liquid is extruded into the heat dissipation holes on the stator core, so as to timely absorb the heat on the stator coil and the stator core and conduct it to the outside of the housing 1. The reset spring 5 is installed in the liquid cooling heat dissipation bag 4, and the natural length of the reset spring 5 is not less than the natural length of the liquid cooling heat dissipation bag 4. When the extruded telescopic tube stops extruding toward the liquid cooling heat dissipation bag 4, it will be reset by the reset spring 5. The second heat dissipation extrusion piece has the same structure as the first heat dissipation extrusion piece, and the first heat dissipation extrusion piece and the second heat dissipation extrusion piece are distributed along the circumference of the stator core according to a predetermined spacing.

[0041] The internal and external circulation heat sink includes a first liquid-cooled external heat sink 10 and a second liquid-cooled external heat sink 11, and the first liquid-cooled external heat sink 10 and the second liquid-cooled external heat sink 11 are both arranged on the housing 1. The first liquid-cooled external heat sink 10 is in the shape of a spiral tube, and the first liquid-cooled external heat sink 10 is sleeved on the outer wall of the housing 1. One end of the first liquid-cooled external heat sink 10 is connected to one end of the first heat dissipation hole 12 in the stator core, and the first heat dissipation hole 12 extends inside the stator core to conduct the heat on the stator core and the stator coil to the first liquid-cooled external heat sink 10. The other end of the first liquid-cooled external heat sink 10 is connected to a first heat dissipation relay tube, and the free end of the first heat dissipation relay tube is connected to the side wall of the liquid-cooled heat dissipation bag 4 of the second heat dissipation extrusion. The first heat dissipation relay tube is provided with a first one-way valve, and the first one-way valve is used to flow the heat dissipation liquid from the first liquid-cooled external heat sink 10 to the liquid-cooled heat dissipation bag 4 of the second heat dissipation extrusion. Furthermore, the first heat dissipation relay tube is a high-pressure hose. The other end of the first heat dissipation hole 12 is connected to a second heat dissipation relay tube, and the other end of the second heat dissipation relay tube is connected to the end surface of the liquid-cooled heat dissipation bag 4. A second one-way valve is provided on the second heat dissipation relay tube, and the second one-way valve is used to flow the heat dissipation liquid from the liquid-cooled heat dissipation bag 4 to the first heat dissipation hole 12. When the first heat dissipation extrusion is squeezed, the heat dissipation liquid will flow from the liquid-cooled heat dissipation bag 4 to the first heat dissipation hole 12 through the second heat dissipation relay tube, and then flow from the first heat dissipation hole 12 to the first liquid-cooled external radiator 10, and finally flow to the liquid-cooled heat dissipation bag 4 of the second heat dissipation extrusion through the first heat dissipation relay tube.

[0042] The second liquid-cooled external radiator 11 has the same structure as the first liquid-cooled external radiator 10. The second liquid-cooled external radiator 11 is fixedly mounted on the outer wall of the housing 1, and one end of the second liquid-cooled external radiator 11 is connected to one end of the second heat dissipation hole 13 in the stator core. The second heat dissipation hole 13 extends in the stator core in the same manner as the first heat dissipation hole 12, so as to conduct the heat on the stator core and the stator coil to the second liquid-cooled external radiator 11. The other end of the second liquid-cooled external radiator 11 is connected to a third heat dissipation relay tube, and the free end of the third heat dissipation relay tube is connected to the side wall of the liquid-cooled heat dissipation bag 4. The third heat dissipation relay tube is provided with a third one-way valve, and the third one-way valve is used to flow the heat dissipation liquid from the second liquid-cooled external radiator 11 to the liquid-cooled heat dissipation bag 4. Further, the third heat dissipation relay tube is a high-pressure hose. The other end of the second heat dissipation hole 13 is connected with a fourth heat dissipation relay tube, and the other end of the fourth heat dissipation relay tube is connected with the end surface of the liquid cooling heat dissipation bag 4 of the second heat dissipation extrusion. The fourth heat dissipation relay tube is provided with a fourth one-way valve, and the fourth one-way valve is used to flow the heat dissipation liquid from the liquid cooling heat dissipation bag 4 of the second heat dissipation extrusion to the second heat dissipation hole 13. When the second heat dissipation extrusion is squeezed, the heat dissipation liquid in the liquid cooling heat dissipation bag 4 of the second heat dissipation extrusion will flow from the liquid cooling heat dissipation bag 4 to the second heat dissipation hole 13 through the fourth heat dissipation relay tube, and then flow from the second heat dissipation hole 13 to the second liquid cooling external radiator 11, and finally flow to the liquid cooling heat dissipation bag 4 through the third heat dissipation relay tube. It should be noted that the first heat dissipation extrusion and the second heat dissipation extrusion are alternately squeezed at intervals when in use, so that the heat dissipation liquid in the first heat dissipation extrusion and the second heat dissipation extrusion flows in one direction, and the heat in the stator core and the stator coil is transferred to the first liquid cooling external radiator 10 and the second liquid cooling external radiator 11 outside the housing 1 for heat dissipation and cooling.

[0043] As an option, the first heat dissipation hole 12 is distributed in the stator core in a spiral shape, and the axis of the first heat dissipation hole 12 coincides with the axis of the stator core. As another option, the first heat dissipation hole 12 includes a main heat dissipation hole and a heat dissipation bypass hole, and the two ends of the heat dissipation main hole are respectively connected to the liquid cooling heat dissipation bag 4 and the internal and external circulation heat dissipation parts, and the two ends of the heat dissipation bypass hole are respectively connected to the two ends of the heat dissipation main hole, that is, the heat dissipation bypass hole is connected in parallel with the middle section of the heat dissipation main hole. So that the heat dissipation liquid enters one end of the heat dissipation main hole, flows through the middle section of the heat dissipation main hole and the heat dissipation bypass hole, and then flows to the other end of the heat dissipation main hole. The heat dissipation bypass hole extends in a curve to the stator core where the stator coil is wound, so as to directly conduct the heat from the stator core where the stator coil is wound. Six sets of the circulation heat dissipation parts are provided, and the six sets of the circulation heat dissipation parts are distributed circumferentially in the stator core.

[0044] The heat dissipation transmission member includes a transmission driving wheel 14, a transmission driven wheel 15, a transmission extrusion wheel 16 and a transmission extrusion plate 17. The transmission driving wheel 14 is gear-shaped and fixedly sleeved on the rotating shaft of the rotor 2. The transmission driven wheel 15 is gear-shaped and arranged on the driven transmission frame 18, and the transmission driven wheel 15 is meshed with the transmission driving wheel 14. The other end of the driven transmission frame 18 is fixedly arranged on the stator core. There are three transmission driven wheels 15, and the three transmission driven wheels 15 are evenly distributed around the transmission driving wheel 14. The transmission extrusion wheel 16 is in the shape of an internal gear. The transmission extrusion wheel 16 is simultaneously mounted outside the three transmission driven wheels 15, and the transmission extrusion wheel 16 is meshed with the transmission driven wheels 15. The outer ring of the transmission extrusion wheel 16 is embedded in the first annular groove on the inner wall of the housing 1, so that the transmission extrusion wheel 16 can rotate circumferentially in the first annular groove to increase the stability of the transmission extrusion wheel 16 during circumferential rotation. The axis of the first annular groove coincides with the axis of the housing 1. Further, an annular ring 19 is provided on one end of the transmission extrusion wheel 16, and the axis of the annular ring 19 coincides with the axis of the transmission extrusion wheel 16. The free end of the annular ring 19 is slidably embedded in the second annular groove on the inner wall of one end face of the housing 1, so that the annular ring 19 can rotate circumferentially in the second annular groove. The axis of the second annular groove coincides with the axis of the annular ring 19. To improve the axial bearing capacity of the transmission extrusion wheel 16. The transmission extrusion plate 17 is in the shape of an arc block. The transmission extrusion plate 17 is fixedly arranged on the other end face of the transmission extrusion wheel 16 to extrude the planar sliding member, and then extrude the extrusion telescopic tube to shrink axially, and finally extrude the liquid-cooled heat dissipation bag 4 to squeeze the heat dissipation liquid into the heat dissipation hole to dissipate heat and cool the stator 3. Four transmission extrusion plates 17 are arranged, and the four transmission extrusion plates 17 are evenly distributed along the circumference of the transmission extrusion wheel 16 to extrude six sets of the circulating heat dissipation components. It should be noted that the transmission extrusion plate 17 cannot extrude the first heat dissipation extrusion component and the second heat dissipation extrusion component in a set of the circulating heat dissipation components at the same time.

[0045] The brake member includes a brake friction member and a brake transmission member, and both the brake friction member and the brake transmission member are arranged on the motor. The brake friction member includes a brake transmission shaft 20, a first friction plate 21 and a second friction plate 22. One end of the brake transmission shaft 20 horizontally passes through one end surface of the housing 1, and the brake transmission shaft 20 can slide back and forth axially on the housing 1. The four brake transmission shafts 20 are evenly distributed along the axis of the housing 1. The first friction plate 21 is fixedly arranged on one end of the four brake transmission shafts 20, and the axis of the first friction plate 21 coincides with the axis of the housing 1. The second friction plate 22 is fixedly arranged on one end surface of the driving wheel 14, and the axis of the second friction plate 22 coincides with the axis of the first friction plate 21. When the brake transmission member drives the first friction plate 21 to be pressed on the second friction plate 22 through the brake transmission shaft 20 to brake the stator 3. The brake transmission member includes a force application tube 23, a transmission tube 24 and a magnetic coil 25. The inner diameter of the force application tube 23 is larger than the diameter of the rotating shaft of the stator 3. One end of the force application tube 23 is fixedly arranged on one end surface of the housing 1, and the force application tube 23 is sleeved outside the rotating shaft of the stator 3. One end of the transmission tube 24 is fixedly arranged on the other end of the four brake transmission shafts 20. The magnetic coil 25 is fixedly embedded on the inner wall of the transmission tube 24, and the magnetic coil 25 is sleeved outside the force application tube 23. When the magnetic coil 25 is fed with positive direct current to generate a magnetic field, it pushes the transmission tube 24 to move to the right. The transmission tube 24 moving to the right drives the first friction plate 21 to press on the second friction plate 22 through the brake transmission shaft 20 to brake the stator 3. When the magnetic coil 25 is fed with reverse direct current to generate a magnetic field, it pushes the transmission tube 24 to move to the left to disengage the first friction plate 21 from the second friction plate 22 to release the stator 3. As an option, the force tube 23 is a permanent magnet tube to increase the axial magnetic thrust of the magnetic coil 25 and the force tube 23. It should be noted that the magnetic coil 25 needs to be fed with direct current to generate a magnetic field only when the stator 3 needs to be braked, so the magnetic field generated by it will not affect the rotation of the stator 3.

[0046] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A low-voltage, high-current, high-power-density permanent magnet synchronous motor, characterized in that: include: A servo motor, which provides power to the outside; a circulating heat sink, which is arranged on the servo motor, and includes a heat sink extrusion member, an internal and external circulation heat sink member and a heat sink transmission member, wherein the heat sink extrusion member is extruded on the servo motor to provide heat sink liquid, the internal and external circulation heat sink member allows the extruded heat sink liquid to flow on the servo motor to conduct the heat inside the servo motor, and the heat sink transmission member applies an extrusion force to the heat sink extrusion member on the servo motor; A brake member, which is arranged on the servo motor, and comprises a brake friction member and a brake transmission member, wherein the brake friction member is driven by the brake transmission member connected to the servo motor to brake the servo motor; The brake friction member comprises a brake transmission shaft, a first friction plate and a second friction plate, one end of the brake transmission shaft passes through one end surface of the housing of the servo motor, and a plurality of the brake transmission shafts are evenly distributed along the circumferential direction of the axis of the housing; the first friction plate is arranged on one end of a plurality of the brake transmission shafts, the second friction plate is arranged on one end surface of the transmission driving wheel of the heat dissipation transmission member, and the second friction plate corresponds to the first friction plate; the brake transmission member comprises a force application tube, a transmission tube and a magnetic coil, one end of the force application tube is arranged on one end surface of the housing, one end of the transmission tube is arranged on the other end of the plurality of the brake transmission shafts, the magnetic coil is embedded in the inner wall of the transmission tube, and the magnetic coil is sleeved outside the force application tube; The heat dissipation extrusion comprises a first heat dissipation extrusion and a second heat dissipation extrusion, and the first heat dissipation extrusion and the second heat dissipation extrusion are both arranged on the stator of the servo motor; the first heat dissipation extrusion comprises an extruded inner tube, an extruded outer tube, a liquid cooling heat dissipation capsule and a reset spring, one end face of the extruded inner tube is arranged on one end face of the stator core of the stator, one end of the extruded outer tube is slidably sleeved on the other end of the extruded inner tube, the liquid cooling heat dissipation capsule is arranged on the extruded inner tube and the extruded outer tube, and the reset spring is arranged on the liquid cooling heat dissipation capsule; The first heat dissipation extrusion member further comprises a plane sliding member, the plane sliding member is arranged on the extruded outer tube, the plane sliding member comprises a plane sliding plate and a needle roller, one end surface of the plane sliding plate is fixedly arranged on the other end surface of the extruded outer tube, and the needle roller is arranged on the other end surface of the plane sliding plate, so that the needle roller can roll circumferentially on the plane sliding plate; The internal and external circulation heat sink comprises a first liquid-cooled external radiator and a second liquid-cooled external radiator, both of which are arranged on the casing of the servo motor; the first liquid-cooled external radiator is sleeved on the outer wall of the casing, one end of the first liquid-cooled external radiator is connected through one end of the first heat dissipation hole in the stator core, the first heat dissipation hole extends inside the stator core, the other end of the first liquid-cooled external radiator is connected through a first heat dissipation relay tube, the free end of the first heat dissipation relay tube is connected through a side wall of the liquid-cooled heat dissipation bag of the second heat dissipation extrusion, the first heat dissipation relay tube is provided with a first one-way valve, the other end of the first heat dissipation hole is connected through a second heat dissipation relay tube, the other end of the second heat dissipation relay tube is connected through an end surface of the liquid-cooled heat dissipation bag, and the second heat dissipation relay tube is provided with a second one-way valve; The heat dissipation transmission member also includes a transmission driven wheel, a transmission extrusion wheel and a transmission extrusion plate, the transmission driving wheel is fixedly sleeved on the rotating shaft of the rotor of the servo motor, the transmission driven wheel is arranged on the driven transmission frame, and the transmission driven wheel is meshed with the transmission driving wheel, the other end of the driven transmission frame is arranged on the stator core, and a plurality of the transmission driven wheels are distributed circumferentially around the transmission driving wheel; the transmission extrusion wheel is in the shape of an internal gear, the transmission extrusion wheel is simultaneously sleeved outside a plurality of the transmission driven wheels, and the transmission extrusion wheel is meshed with the transmission driven wheels, the outer ring of the transmission extrusion wheel is embedded in the first annular groove on the inner wall of the casing, an annular ring is arranged on one end of the transmission extrusion wheel, and the free end of the annular ring is slidably embedded in the second annular groove on the inner wall of one end face of the casing, the transmission extrusion plate is in the shape of an arc block, and the transmission extrusion plate is arranged on the other end face of the transmission extrusion wheel for extruding the planar sliding member; a plurality of the transmission extrusion plates are evenly distributed along the circumference of the transmission extrusion wheel.

2. The low-voltage, high-current, high-power-density permanent magnet synchronous motor according to claim 1, characterized in that: The liquid cooling heat dissipation bag is in the shape of a sealed corrugated tube, the liquid cooling heat dissipation bag is embedded in the extruded inner tube and the extruded outer tube, the liquid cooling heat dissipation bag is filled with heat dissipation liquid, and the return spring is installed in the liquid cooling heat dissipation bag.

3. The low-voltage, high-current, high-power-density permanent magnet synchronous motor according to claim 1, characterized in that: The second heat dissipation extrusion piece has the same structure as the first heat dissipation extrusion piece, and the first heat dissipation extrusion piece and the second heat dissipation extrusion piece are distributed along the circumference of the stator core at a predetermined interval.

4. The low-voltage, high-current, high-power-density permanent magnet synchronous motor according to claim 1, characterized in that: The second liquid-cooled external radiator is sleeved on the outer wall of the casing, and one end of the second liquid-cooled external radiator is through-connected with one end of the second heat dissipation hole in the stator core, the other end of the second liquid-cooled external radiator is through-connected with a third heat dissipation relay tube, the free end of the third heat dissipation relay tube is through-connected with the side wall of the liquid-cooled heat dissipation bag, and the third heat dissipation relay tube is provided with a third one-way valve; the other end of the second heat dissipation hole is through-connected with a fourth heat dissipation relay tube, the other end of the fourth heat dissipation relay tube is through-connected with the end surface of the liquid-cooled heat dissipation bag of the second heat dissipation extrusion piece, and the fourth heat dissipation relay tube is provided with a fourth one-way valve.

5. The low-voltage, high-current, high-power-density permanent magnet synchronous motor according to claim 1, characterized in that: The first heat dissipation holes include a main heat dissipation hole and a heat dissipation bypass hole. Two ends of the main heat dissipation hole are respectively connected with the liquid cooling heat dissipation bag and the internal and external circulation heat dissipation components. Two ends of the heat dissipation bypass hole are respectively connected with two ends of the heat dissipation main hole, so that the heat dissipation bypass hole is connected in parallel with the middle section of the heat dissipation main hole. The heat dissipation bypass hole extends in a curve to the stator core where the stator coil of the stator is wound. The circulation heat dissipation components are provided in multiple sets, and the multiple sets of the circulation heat dissipation components are distributed circumferentially of the stator core.

Images