Permanent magnet synchronous motor and heat dissipation method thereof

Abstract

The invention relates to a permanent magnet synchronous motor and a heat dissipation method thereof, the permanent magnet synchronous motor comprises a base, a shell is arranged above the base, a rotor and a stator are arranged in the center of the shell, an output shaft is matched with the center of the rotor, the stator comprises a stator iron core, a stator winding is wound on the surface of the stator iron core, and a plurality of heat dissipation fins are arranged on one surface, close to the shell, of the stator iron core. The cooling fins are evenly arranged along the face, close to the shell, of the stator iron core, the cooling fins are matched with pulsating heat pipes, and the pulsating heat pipes and the cooling fins are arranged at intervals in a staggered mode. The pulsating heat pipes and the cooling fins are combined for heat dissipation, so that heat in the motor can be efficiently transferred and dissipated, the temperature of the stator core is effectively reduced, and the service life of the motor is prolonged. External mechanical work and electric work do not need to be consumed during work of the pulsating heat pipe, and motor cost is further reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of permanent magnet synchronous motors, and specifically relates to a permanent magnet synchronous motor and a heat dissipation method thereof. Background Art

[0002] A permanent magnet synchronous motor is a synchronous motor that uses permanent magnets to generate a magnetic field. The speed of its rotor is consistent with the current frequency of the stator winding. It consists of a stator, a rotor, and an end cover. The stator is basically the same as an ordinary induction motor, and uses a laminated structure to reduce iron loss during motor operation. The rotor can be made solid or laminated. The armature winding can be a concentrated full-pitch winding, a distributed short-pitch winding, or an unconventional winding.

[0003] The working principle of permanent magnet synchronous motor is based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnets on the rotor. The rotor is equipped with pre-magnetized permanent magnets, which can generate a strong magnetic field when rotating, thereby providing greater output torque. The motor control system will accurately regulate the current to ensure that the motor rotor can rotate synchronously with the rotating magnetic field and maintain a stable operating state;

[0004] Conventional permanent magnet synchronous motors generally have heat sinks on the outer surface of the stator, using air for passive heat dissipation or the motor's built-in fan for heat dissipation. For better heat dissipation, some motors also use oil or water circuits around the stator for heat dissipation, but both require additional water pumps to promote circulation. The air temperature and humidity in mines are high, and traditional permanent magnet synchronous motors use heat sinks for passive heat dissipation, which can easily cause the motor temperature to be too high and cause the motor to lose its magnetism. At the same time, some permanent magnet synchronous motors with built-in fans are prone to internal corrosion when dissipating heat due to the high temperature and humidity of the air inside the mine. Summary of the invention

[0005] In order to solve the problem that the conventional motor is easily demagnetized due to high temperature and rusted due to high humidity when working in the high temperature and high humidity environment of a mine, the present invention proposes a permanent magnet synchronous motor and a heat dissipation method thereof to solve the above problem.

[0006] A permanent magnet synchronous motor comprises a base, a shell is installed above the base, a rotor and a stator are arranged at the center of the shell, an output shaft is matched with the center of the rotor, the stator comprises a stator core, a stator winding is wound around the surface of the stator core, a heat sink is arranged on a side of the stator core close to the shell, a plurality of heat sinks are arranged uniformly along a side of the stator core close to the shell, a pulsating heat pipe is matched with the heat sink, and the pulsating heat pipe and the heat sink are arranged alternately at intervals.

[0007] Furthermore, the interior of the pulsating heat pipe is filled with coolant columns and bubble columns, which are arranged at intervals and in a randomly distributed state; the pulsating heat pipe evacuates the interior of the tube and then fills it with part of the working medium. Since the tube diameter is small enough, bubble columns and liquid columns will be formed in the tube and arranged at intervals and in a randomly distributed state. At the evaporation end, the working fluid absorbs heat to generate bubbles, which expand and increase in pressure rapidly, pushing the working fluid to flow to the low-temperature condensation end. There, the bubbles cool, shrink and burst, and the pressure drops. Due to the pressure difference between the two ends and the pressure imbalance between adjacent tubes, the working fluid oscillates and flows between the evaporation end and the condensation end, thereby realizing heat transfer; during the entire process, no external mechanical work and electrical work need to be consumed, further reducing costs.

[0008] Furthermore, a heat conducting plate is arranged between the stator core and the heat sink, the pulsating heat pipe comprises a heat absorbing end and a heat releasing end, the heat absorbing end and the heat sink are arranged alternately at intervals, the heat releasing end is matched with an air duct, part of the heat releasing end extends into the air duct, the air duct is located between the stator and the shell, and the other part of the heat releasing end passes through the air duct and extends into the inside of the shell, a filling port is opened on the surface of the shell, the filling port is matched with a filling pipe, and the filling pipe is connected to the heat releasing end of the pulsating heat pipe; a heat sink is arranged to help dissipate heat, and the heat absorbing end and the heat sink are arranged alternately at intervals to improve the heat dissipation efficiency of the pulsating heat pipe.

[0009] Furthermore, a guide block is provided on the inner surface of the air duct. The guide block is a smooth protrusion. The guide block is located on the inner surface of the air duct close to the outer shell. The guide block is provided to increase the flow rate of the wind in the air duct and improve the heat dissipation efficiency.

[0010] Furthermore, a bearing is installed at the connection between the output shaft and the stator, a first fan is connected to one end of the output shaft, the first fan is equipped with a dust cover, a fixed bearing is arranged at the center of the inner surface of the dust cover, the fixed bearing is connected to one end of the output shaft, the dust cover and the outer shell are fixedly connected, and a grid is installed at one end of the outer shell away from the dust cover; the dust cover and the grid are arranged to better adapt to the dusty environment under the mine and improve the applicability of the motor.

[0011] Furthermore, a cavity is provided on one side of the grid close to the rotor, the cavity is connected to the air duct, a rotation speed sensor is provided in the cavity, and a seal is provided at the connection between the grid and the output shaft to prevent water vapor from penetrating and causing corrosion of the rotor and stator.

[0012] Furthermore, a shaft sleeve is installed at the other end of the output shaft, a belt groove is provided on the surface of the shaft sleeve, a transmission belt is matched with the belt groove, and the transmission belt is matched with a second fan.

[0013] Furthermore, the second fan includes a second fan protective cover, a rotating shaft is fixedly installed at the center of the second fan protective cover, one end of the rotating shaft is fixedly connected to the second fan, the other end of the rotating shaft is fixedly connected to the grid, a second fan bearing is arranged at the connection between the rotating shaft and the grid, and a plurality of second fans are arranged, and the plurality of second fans are evenly distributed on the outer surface of the grid along the rotation direction of the output shaft; the second fan is arranged to draw air into the outer casing to accelerate air circulation and improve heat dissipation efficiency.

[0014] Furthermore, the rotor is made of neodymium iron boron, which improves the heat resistance of the rotor and prevents demagnetization due to high temperature.

[0015] A heat dissipation method for a permanent magnet synchronous motor comprises the following steps:

[0016] S1, first fan heat dissipation: When the power is turned on, the motor starts, the rotor rotates to drive the output shaft to rotate, the stator and the rotor generate heat, and the heat is transferred to the outside through the heat sink arranged on the surface of the stator core. The first fan sends air into the air duct, and the airflow passes through the air duct to help the heat sink dissipate heat to the air;

[0017] S2. Pulsating heat pipe heat dissipation: After the motor is started, the heat is released to the heat absorbing end of the pulsating heat pipe through the heat sink arranged on the surface of the stator core. The coolant column inside the pulsating heat pipe is heated and evaporated into gas. Due to the incompressibility of the liquid and the closed environment of the pulsating heat pipe itself, the pressure generated by the evaporation of the coolant column promotes the movement of the remaining coolant columns and bubble columns. The gasified gas of the coolant moves to the heat releasing end. Since the heat releasing end is located inside the air duct, the first fan and the guide block cooperate to help the heat releasing end to dissipate heat. The gasified gas of the coolant inside the heat releasing end is liquefied into a coolant column and forms a pressure difference, so that the coolant column and the bubble column inside the pulsating heat pipe continuously circulate along the pulsating heat pipe to help the motor dissipate heat.

[0018] S3, second fan heat dissipation: the motor starts and drives the output shaft to rotate, the output shaft rotation drives the shaft sleeve to rotate, the shaft sleeve rotates through the transmission belt, drives multiple second fans to rotate, draws air into the cavity and the air duct, and accelerates air circulation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The combination of pulsating heat pipe and heat sink can efficiently transfer and dissipate the heat inside the motor, effectively reducing the temperature of the stator core, thereby extending the service life of the motor. The operation of the pulsating heat pipe does not require external mechanical and electrical work, further reducing costs.

[0021] The setting of the heat conduction plate enhances the heat conduction efficiency between the stator core and the heat sink, while the design of the air duct and guide block increases the air flow rate and further improves the heat dissipation efficiency. This not only optimizes the thermal management of the motor, but also ensures its stability and reliability under high load operation.

[0022] The configuration of dust cover and grid makes the motor more suitable for dusty environments such as mines, effectively preventing dust from invading the internal parts of the motor, and improving the durability and applicability of the motor. At the same time, the speed sensor and seal in the cavity prevent the infiltration of water vapor and protect the rotor and stator from corrosion.

[0023] By installing the shaft sleeve and the second fan, the motor not only has a convenient transmission method, but also further enhances the heat dissipation effect. The introduction of the second fan speeds up the air circulation, allowing the heat inside the motor to be taken away more quickly, thus ensuring the long-term stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a cross-sectional view of a permanent magnet synchronous motor;

[0026] Figure 2 It is a front view of a permanent magnet synchronous motor;

[0027] Figure 3 Schematic diagram of the pulsating heat pipe structure;

[0028] Figure 4 for Figure 1 Enlarged view of part A in the middle;

[0029] Figure 5 is a schematic diagram of the structure of the second fan;

[0030] Figure 6 for Figure 1 Enlarged view of part B.

[0031] In the figure: 1. base; 2. shell; 3. dust cover; 4. first fan; 5. output shaft; 6. rotor; 7. stator; 701. stator core; 702. stator winding; 703. heat conduction plate; 8. air duct; 801. guide block; 9. bushing; 10. second fan protective cover; 1001 belt groove; 1002. second fan bearing; 11. second fan; 12. grid; 13. bearing; 14. pulsating heat pipe; 1401. coolant column; 1402. bubble column; 15. heat sink; 16. transmission belt. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1-6 As shown: a permanent magnet synchronous motor, including a base 1, a shell 2 is installed above the base 1, a rotor 6 and a stator 7 are arranged in the center of the shell 2, an output shaft 5 is matched with the center of the rotor 6, and the stator 7 includes a stator core 701, a stator winding 702 is wound around the surface of the stator core 701, a heat sink 15 is arranged on the side of the stator core 701 close to the shell 2, and a plurality of heat sinks 15 are arranged uniformly along the side of the stator core 701 close to the shell 2, and the heat sink 15 is matched with a pulsating heat pipe 14, and the pulsating heat pipe 14 and the heat sink 15 are arranged alternately at intervals.

[0036] The pulsating heat pipe 14 is filled with cooling liquid columns 1401 and bubble columns 1402 , and the cooling liquid columns 1401 and bubble columns 1402 are arranged at intervals and in a randomly distributed state.

[0037] A heat conducting plate 703 is arranged between the stator core 701 and the heat sink 15. The pulsating heat pipe 14 includes a heat absorbing end and a heat releasing end. The heat absorbing end and the heat sink 15 are arranged alternately at intervals. The heat releasing end is equipped with an air duct 8. Part of the heat releasing end extends into the air duct 8. The air duct 8 is located between the stator 7 and the outer shell 2. The other part of the heat releasing end passes through the air duct 8 and extends into the inner part of the outer shell 2. A liquid filling port is opened on the surface of the outer shell 2. The liquid filling port is equipped with a liquid filling pipe. The liquid filling pipe is connected to the heat releasing end of the pulsating heat pipe 14.

[0038] The inner surface of the air duct 8 is provided with a guide block 801 , which is a smooth protrusion. The guide block 801 is located on the inner surface of the air duct 8 close to the outer shell 2 .

[0039] A bearing 13 is installed at the connection between the output shaft 5 and the stator 7. One end of the output shaft 5 is connected to the first fan 4. The first fan 4 is equipped with a dust cover 3. A fixed bearing is arranged at the center of the inner surface of the dust cover 3. The fixed bearing is connected to one end of the output shaft 5. The dust cover 3 is fixedly connected to the outer shell 2. A grid 12 is installed at the end of the outer shell 2 away from the dust cover 3.

[0040] The grid 12 is provided with a cavity on one side close to the rotor 6 , the cavity is connected to the air duct 8 , a rotation speed sensor is provided in the cavity, and a seal is provided at the connection between the grid 12 and the output shaft 5 .

[0041] A shaft sleeve 9 is installed at the other end of the output shaft 5 . A belt groove 1001 is provided on the surface of the shaft sleeve 9 . A transmission belt 16 is matched with the belt groove 1001 . The transmission belt 16 is matched with the second fan 11 .

[0042] The second fan 11 includes a second fan protective cover 10, and a belt groove 1001 is arranged on the surface of the second fan protective cover 10, and the belt groove 1001 cooperates with the transmission belt 16. A rotating shaft is fixedly installed at the center of the second fan protective cover 10, and the second fan 11 is fixedly connected to one end of the rotating shaft, and the other end of the rotating shaft is fixedly connected to the grid 12. A second fan bearing 1002 is arranged at the connection between the rotating shaft and the grid 12. A plurality of second fans 11 are arranged, and the plurality of second fans 11 are evenly distributed on the outer surface of the grid 12 along the rotation direction of the output shaft 5.

[0043] The rotor 6 is made of neodymium iron boron.

[0044] Example 2

[0045] like Figure 1-6 As shown; A heat dissipation method for a permanent magnet synchronous motor comprises the following steps:

[0046] S1, first fan 4 heat dissipation: power is turned on, the motor starts, the rotor 6 rotates to drive the output shaft 5 to rotate, the stator 7 and the rotor 6 generate heat, the heat is transferred to the outside through the heat sink 15 provided on the surface of the stator core 701, the first fan 4 sends air to the air duct 8, and the airflow passes through the air duct 8 to help the heat sink 15 dissipate heat to the air;

[0047] S2, heat dissipation of the pulsating heat pipe 14: after the motor is started, the heat is released to the heat absorbing end of the pulsating heat pipe 14 through the heat sink 15 provided on the surface of the stator core 701, and the coolant column 1401 inside the pulsating heat pipe 14 is heated and evaporated into gas. Due to the incompressibility of the liquid and the closed environment of the pulsating heat pipe 14 itself, the coolant column 1401 is heated and evaporated to generate pressure to push the remaining coolant columns 1401 and the bubble column 1402 to move, and the gasified gas of the coolant moves to the heat releasing end. Since the heat releasing end is located inside the air duct, the first fan 4 and the guide block 801 cooperate to help the heat releasing end to dissipate heat. The gasified gas of the coolant inside the heat releasing end is liquefied into the coolant column 1401 and a pressure difference is formed, so that the coolant column 1401 and the bubble column 1402 inside the pulsating heat pipe 14 continuously circulate along the pulsating heat pipe 14 to help the motor dissipate heat;

[0048] S3. The second fan 11 dissipates heat: the motor starts and drives the output shaft 5 to rotate. The rotation of the output shaft 5 drives the shaft sleeve 9 to rotate. The shaft sleeve 9 rotates through the transmission belt 16, driving multiple second fans 11 to rotate, drawing air into the cavity and the air duct 8 to accelerate air circulation.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A permanent magnet synchronous motor, characterized in that: The invention comprises a base (1), a shell (2) is installed above the base (1), a rotor (6) and a stator (7) are arranged at the center of the shell (2), an output shaft (5) is matched at the center of the rotor (6), the stator (7) comprises a stator core (701), a stator winding (702) is wound around the surface of the stator core (701), a heat sink (15) is arranged on a side of the stator core (701) close to the shell (2), a plurality of heat sinks (15) are arranged, and the plurality of heat sinks (15) are evenly arranged along a side of the stator core (701) close to the shell (2), the heat sink (15) is matched with a pulsating heat pipe (14), and the pulsating heat pipe (14) and the heat sink (15) are arranged alternately.

2. A permanent magnet synchronous motor according to claim 1, characterized in that: The pulsating heat pipe (14) is filled with cooling liquid columns (1401) and bubble columns (1402), and the cooling liquid columns (1401) and bubble columns (1402) are arranged at intervals and in a randomly distributed state.

3. A permanent magnet synchronous motor according to claim 1, characterized in that: A heat conducting plate (703) is arranged between the stator core (701) and the heat sink (15); the pulsating heat pipe (14) comprises a heat absorbing end and a heat releasing end; the heat absorbing end and the heat sink (15) are arranged alternately; the heat releasing end is matched with an air duct (8); part of the heat releasing end extends into the air duct (8); the air duct (8) is located between the stator (7) and the housing (2); another part of the heat releasing end passes through the air duct (8) and extends into the interior of the housing (2); a liquid filling port is provided on the surface of the housing (2); the liquid filling port is matched with a liquid filling pipe; the liquid filling pipe is connected to the heat releasing end of the pulsating heat pipe (14).

4. A permanent magnet synchronous motor according to claim 3, characterized in that: The inner surface of the air duct (8) is provided with a guide block (801), the guide block (801) being a smooth protrusion, and the guide block (801) is located on the inner surface of the air duct (8) close to the outer shell (2).

5. A permanent magnet synchronous motor according to claim 4, characterized in that: A bearing (13) is installed at the connection between the output shaft (5) and the stator (7); one end of the output shaft (5) is connected to a first fan (4); the first fan (4) is equipped with a dust cover (3); a fixed bearing is arranged at the center of the inner surface of the dust cover (3); the fixed bearing is connected to one end of the output shaft (5); the dust cover (3) and the outer shell (2) are fixedly connected; and a grid (12) is installed at one end of the outer shell (2) away from the dust cover (3).

6. A permanent magnet synchronous motor according to claim 5, characterized in that: A cavity is provided on one side of the grid (12) close to the rotor (6), the cavity is connected to the air duct (8), a rotation speed sensor is provided in the cavity, and a seal is provided at the connection between the grid (12) and the output shaft (5).

7. A permanent magnet synchronous motor according to claim 5, characterized in that: A shaft sleeve (9) is installed at the other end of the output shaft (5); a belt groove (1001) is provided on the surface of the shaft sleeve (9); a transmission belt (16) is matched with the belt groove (1001); and the transmission belt (16) is matched with a second fan (11).

8. A permanent magnet synchronous motor according to claim 7, characterized in that: The second fan (11) comprises a second fan protective cover (10), a rotating shaft is fixedly installed at the center of the second fan protective cover (10), one end of the rotating shaft is fixedly connected to the second fan (11), the other end of the rotating shaft is fixedly connected to the grid (12), a second fan bearing (1002) is arranged at the connection between the rotating shaft and the grid (12), and a plurality of the second fans (11) are arranged, and the plurality of the second fans (11) are evenly distributed on the outer surface of the grid (12) along the rotation direction of the output shaft (5).

9. The permanent magnet synchronous motor according to claim 1, characterized in that: The rotor (6) is made of neodymium iron boron.

10. A method for dissipating heat of a permanent magnet synchronous motor, characterized in that: The following steps are involved: S1. first fan (4) heat dissipation: power is turned on, the motor starts, the rotor (6) rotates, driving the output shaft (5) to rotate, the stator (7) and the rotor (6) generate heat, the heat is transferred to the outside through the heat sink (15) provided on the surface of the stator core (701), the first fan (4) sends air into the air duct (8), and the airflow passes through the air duct (8) to help the heat sink (15) dissipate heat into the air; S2, heat dissipation of the pulsating heat pipe (14): after the motor is started, heat is released to the heat absorbing end of the pulsating heat pipe (14) through the heat sink (15) provided on the surface of the stator core (701), and the cooling liquid column (1401) inside the pulsating heat pipe (14) is heated and evaporated into gas. Due to the incompressibility of the liquid and the closed environment of the pulsating heat pipe (14) itself, the cooling liquid column (1401) is heated and evaporated to generate pressure to push the remaining cooling liquid columns (1401) and the bubble column (1402) to move, and the gasified gas of the cooling liquid moves to the heat releasing end. Since the heat releasing end is located inside the air duct, the first fan (4) and the guide block (801) cooperate to help the heat releasing end to dissipate heat. The gasified gas of the cooling liquid inside the heat releasing end is liquefied into the cooling liquid column (1401) and forms a pressure difference, so that the cooling liquid column (1401) and the bubble column (1402) inside the pulsating heat pipe (14) continuously circulate along the pulsating heat pipe (14), thereby helping the motor to dissipate heat; S3, heat dissipation by the second fan (11): the motor starts to drive the output shaft (5) to rotate, the rotation of the output shaft (5) drives the shaft sleeve (9) to rotate, the shaft sleeve (9) rotates through the transmission belt (16), drives the plurality of second fans (11) to rotate, draws air into the cavity and the air duct (8), and accelerates air circulation.

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