Semi-direct-drive permanent magnet synchronous frequency conversion all-in-one machine

Abstract

The invention relates to the field of motors, in particular to a semi-direct-drive permanent magnet synchronous frequency conversion all-in-one machine. The semi-direct-drive permanent magnet synchronous frequency conversion all-in-one machine comprises a motor main body module, a frequency converter module and a planetary reducer module. The planetary reducer module is mounted on a front end cover of the motor main body module; an air cooling heat dissipation unit is installed on the motor main body module, an air inlet opening in the air cooling heat dissipation unit is located at the rear end cover, and an air outlet opening in the air cooling heat dissipation unit is located at the front end cover; the planetary reducer module is further provided with a water-cooling heat dissipation unit. In the semi-direct-drive permanent magnet synchronous frequency conversion all-in-one machine provided by the invention, the planetary reducer module still adopts a water cooling system for heat dissipation, and meanwhile, airflow generated in the rotation process of the impeller can also directly act on the planetary reducer module, so that air cooling heat dissipation can be carried out on the planetary reducer module, and the service life of the planetary reducer module is prolonged. And the heat dissipation effect on the planetary reducer module is improved.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a semi-direct drive permanent magnet synchronous frequency conversion integrated machine. Background Art

[0002] Electric motor, commonly known as motor, refers to an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. Electric motors are divided into two categories: electric motors and generators.

[0003] China's authorized patent announcement number: CN 118694086 B records "a deceleration type permanent magnet synchronous frequency conversion integrated machine structure". The integrated machine is composed of a permanent magnet synchronous motor, a gear reducer and a frequency converter. It can achieve high integration, small footprint, easy installation and maintenance, and high system efficiency. The gear reducer is installed at the drive end of the permanent magnet synchronous motor module through modular design. Its power input side and the drive end of the permanent magnet synchronous motor module are splined. In order to further shorten the overall axial space, the gear reducer module and the permanent magnet synchronous motor module adopt a "shared end cover and bearing" solution. While the gear reducer module itself adopts water cooling measures to cool down, it can also use the characteristic of the shared end cover to synchronously cool down the output end of the permanent magnet synchronous motor module, further improving the reliability of the integrated machine during use.

[0004] However, there are still the following defects and shortcomings in the application process: It adopts a common end cover and draw-off design, so when the gear reducer module is water-cooled, the permanent magnet synchronous motor module can be cooled through the common end cover; however, during the operation of the gear reducer, the friction between the gears is relatively large, so the heat generated will be relatively large, and this heat is greater than the heat generated by the motor itself; and if the same end cover and bearing are shared, the heat generated by the gear box module will be conducted to the permanent magnet synchronous motor module, which will not only fail to cool the motor, but will also easily cause the motor to heat up, thus affecting its normal operation.

[0005] Therefore, it is necessary to provide a new semi-direct drive permanent magnet synchronous frequency conversion integrated machine to solve the above technical problems. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a semi-direct drive permanent magnet synchronous frequency conversion all-in-one machine.

[0007] The semi-direct drive permanent magnet synchronous frequency conversion integrated machine provided by the present invention comprises a motor main body module, a frequency converter module and a planetary reducer module; The planetary reducer module is installed on the front end cover of the motor main body module, the output shaft of the motor main body module and the shaft of the planetary reducer module are connected by splines, and there is a certain interval between the planetary reducer module and the motor main body module; An air cooling unit is installed on the motor main body module, wherein an opening for air intake in the air cooling unit is located at the rear end cover, and an opening for air outlet is located at the front end cover and faces the position of the planetary reducer module, and the derived gas also passes through the planetary reducer module to achieve air cooling of the planetary reducer module; The planetary reducer module is also equipped with a water cooling unit, which cooperates with the air cooling unit to cool the planetary reducer module.

[0008] Preferably, the motor main body module includes an outer shell portion and a core portion installed inside the outer shell portion, and there is a gap between the outer shell portion and the core portion.

[0009] Preferably, the air-cooling heat dissipation unit comprises an air duct, which is composed of an outer shell, a core and a plurality of partitions fixed therebetween. The air duct is arranged along the length direction of the outer shell so that the airflow enters from the rear end of the motor main body module and is discharged from the front end. A filter end cap covering the air inlet opening is fixed at the rear end of the outer shell; An impeller is also fixed on the output shaft of the motor main body module, and the impeller corresponds to the air outlet opening at the front end of the motor main body module.

[0010] Preferably, a plurality of fins are installed inside the air duct.

[0011] Preferably, a plurality of annularly distributed positioning rods are fixed to the front end cover of the motor main body module, and a concentric threaded rod is fixed to the other end of the positioning rod, and the diameter of the threaded rod is smaller than the diameter of the positioning rod.

[0012] Preferably, the planetary reducer module is composed of a mounting plate and a main body fixed on the mounting plate, the mounting plate is provided with a plurality of holes, and the threaded rods pass through the mounting plate through the holes and are fixed by nuts, while the positioning rods are pressed against the mounting plate; The impeller in the air-cooling heat dissipation unit is located between the front end cover and the mounting plate of the motor main body module.

[0013] Preferably, the water-cooling heat dissipation unit comprises an inner ring plate, the inner ring plate is concentrically arranged outside the main body, a retaining ring is integrally connected to the circumferential outer wall of the inner ring plate and in a position close to the edge, and a first baffle is fixed thereto, both ends of the first baffle are fixed to the retaining ring, a plurality of second baffles distributed axially and concentrically arranged with the inner ring plate are also fixed to the circumferential outer wall of the inner ring plate, the second baffle is an unclosed circular ring, and only one end is fixed to the first baffle, and a water channel for water flow is formed between the inner ring plate, the retaining ring, the first baffle and the second baffle; A concentric outer ring plate is also provided outside the inner ring plate, and the outer ring plate is tightly pressed against the baffle ring, the first baffle plate and the second baffle plate, and is sealed by a rubber strip, and a liquid inlet and outlet nozzle connected to the waterway are installed on the outer ring plate.

[0014] Preferably, a fixing ring is fixed outside the main body, and a plurality of annularly distributed connecting plates are fixed outside the circumference of the fixing ring. The other end of the connecting plate is fixed to the inner ring plate, and a channel for air flow is formed between the fixing ring and the inner ring plate, and the channel corresponds to the impeller.

[0015] Preferably, the fixing ring, the connecting piece and the inner ring plate are made of aluminum or copper.

[0016] Compared with the related art, the semi-direct drive permanent magnet synchronous frequency conversion integrated machine provided by the present invention has the following beneficial effects: 1. The planetary reducer module is installed at the front cover of the motor main module, and there is a certain distance between it and the motor main module, so as to suppress the conduction of heat and prevent the heat generated by the planetary reducer module from being conducted to the motor main module; 2. Because there is a certain gap between the motor main body module and the planetary reducer module, part of the motor output shaft is in the gap, and an impeller is installed on it. Therefore, during the operation of the motor, it can not only realize the transmission of power and drive the planetary reducer to operate, but also drive the impeller to rotate at high speed, and then use the impeller to speed up the flow rate of the airflow in the airway to achieve air cooling of the motor itself; 3. The planetary reducer module itself still uses a water cooling system for heat dissipation. At the same time, the airflow generated by the impeller during rotation can also directly act on the planetary reducer module, so the planetary reducer module can also be air-cooled to improve the heat dissipation effect of the planetary reducer module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of a preferred embodiment of a semi-direct drive permanent magnet synchronous frequency conversion integrated machine provided by the present invention; Figure 2 The present invention shows Figure 1The structural diagram of the other side; Figure 3 It is a structural schematic diagram of the motor main body module shown in the present invention; Figure 4 It is a structural schematic diagram of the air-cooling heat dissipation unit shown in the present invention; Figure 5 It is a structural schematic diagram of the planetary reduction module shown in the present invention; Figure 6 It is a structural schematic diagram of the water cooling unit shown in the present invention; Figure 7 It is a schematic structural diagram of the fixing ring shown in the present invention.

[0018] Numbers in the figure: 1. Motor main body module; 11. Shell; 12. Core; 2. Inverter module; 3. Planetary reducer module; 31. Main body; 32. Mounting plate; 4. Air-cooled heat dissipation unit; 41. Air duct; 42. Filter end cover; 43. Impeller; 44. Fin; 5. Positioning rod; 6. Threaded rod; 7. Water-cooled heat dissipation unit; 71. Inner ring plate; 72. Baffle ring; 73. First baffle plate; 74. Second baffle plate; 75. Outer ring plate; 76. Liquid inlet nozzle; 77. Liquid outlet nozzle; 78. Fixed ring; 79. Connecting piece. DETAILED DESCRIPTION

[0019] 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 accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0021] See also Figures 1 to 7 , an embodiment of the present invention provides a semi-direct drive permanent magnet synchronous frequency conversion integrated machine, the semi-direct drive permanent magnet synchronous frequency conversion integrated machine comprises a motor main body module 1, a frequency converter module 2 and a planetary reducer module 3, an air cooling unit 4 is installed on the motor main body module 1, and a water cooling unit 7 is installed on the planetary reducer module 3; The motor main body module 1 includes a shell portion 11 and a core portion 12 installed inside the shell portion 11, with a gap between the shell portion 11 and the core portion 12. A plurality of annularly distributed positioning rods 5 are fixed to the front end cover of the motor main body module 1, and a concentric threaded rod 6 is fixed to the other end of the positioning rod 5, and the diameter of the threaded rod 6 is smaller than the diameter of the positioning rod 5; The planetary reducer module 3 is composed of a mounting plate 32 and a main body 31 fixed on the mounting plate 32 . The mounting plate 32 has a plurality of holes, and the threaded rod 6 passes through the mounting plate 32 through the holes and is fixed by a nut, while the positioning rod 5 is pressed against the mounting plate 32 .

[0022] It should be noted that: in this device, the output shaft of the motor main module 1 is connected to the shaft in the planetary reducer module 3 through a spline to achieve the requirement of low output speed, and then the inverter module 2 is installed on the top or side of the motor main module 1 to achieve the requirement of vector precision control, and finally a semi-direct drive permanent magnet synchronous frequency conversion integrated machine is formed, which drives the load equipment by realizing low-speed high torque and vector frequency conversion control. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine has the characteristics of compact overall structure, small footprint, easy use, beautiful appearance, strong mobility, high power density, high control accuracy, and good equipment stability; For the installation between the motor main body module 1 and the planetary reducer module 3, a plurality of positioning rods 5 are fixed at the front end cover of the motor, and a threaded rod 6 is fixed at the other end of the positioning rod 5, and a hole corresponding to the threaded rod 6 is provided on the mounting plate 32, so that the threaded rod 6 can directly pass through the hole, and then be reinforced by a nut to achieve the installation of the planetary reducer module 3; at this time, since the positioning rod 5 is against the mounting plate 32, the mounting plate 32 is not in direct contact with the motor itself, and there is a certain interval between the two, and the planetary reducer module 3 will generate more heat during operation. Under the effect of this interval, the heat conducted from the planetary reducer module 3 to the motor main body module 1 can be weakened, so as to avoid the motor main body module 1 from overheating and ensure the normal operation and use of the motor main body module 1; An air cooling and heat dissipation unit 4 is also installed on the motor main body module 1. The air cooling and heat dissipation unit 4 uses the motor main body module 1 as a driving source. Therefore, the air cooling and heat dissipation unit 4 can be turned on when the motor is running, thereby eliminating the need for extra energy consumption. The planetary reducer module 3 still uses the water-cooling heat dissipation unit 7 for heat dissipation for cooling, and the air cooling generated by the air-cooling heat dissipation unit 4 during operation can also act on the planetary reducer module 3. When used together with the water-cooling heat dissipation unit 7 on the planetary reducer module 3, the cooling effect of the planetary reducer module 3 can be further improved.

[0023] In the embodiments of the present invention, please refer to Figure 3 and Figure 4 The air-cooling heat dissipation unit 4 includes an air duct 41, which is composed of a shell portion 11, a core portion 12, and a plurality of partitions fixed therebetween. The air duct 41 is arranged along the length direction of the shell portion 11, and has an air inlet opening on the rear end shell of the shell portion 11, and an air outlet opening on the front end shell, so that the air flow enters from the rear end of the motor main body module 1 and is discharged from the front end. A filter end cap 42 covering the air inlet opening is fixed at the rear end of the shell portion 11; An impeller 43 is also fixed on the output shaft of the motor main body module 1. The impeller 43 corresponds to the air outlet opening at the front end of the motor main body module 1. The impeller 43 is located between the front end cover of the motor main body module 1 and the mounting plate 32. Meanwhile, a plurality of fins 44 are installed inside the air duct 41 .

[0024] It should be noted that: for the air-cooling heat dissipation unit 4, its impeller 43 is installed on the output shaft in the motor main body module 1, so when the motor is running, it can directly drive the impeller 43 to rotate at a high speed, so that the airflow enters the inside of the air duct 41 from the opening on the rear end cover, and can take away the heat generated by the motor itself when it runs through the inside of the air duct 41, thereby realizing the heat dissipation operation of the motor; at the same time, in order to further improve the heat dissipation effect, fins 44 are also installed inside the air duct 41, and the fins 44 can better guide the heat generated by the motor and take away the heat through the airflow; Because the planetary reducer module 3 itself is not directly installed on the motor main body module 1, and the output shaft of the motor needs to pass through the interval and be installed with the planetary reducer module 3, that is, the outside of the output shaft located in the interval has no restrictions. Therefore, the impeller 43 is installed in this position to make the entire device more compact and the space utilization more thorough. In addition, the speed of the motor output shaft is not reduced and still has a relatively high speed, so that the impeller 43 rotates faster and the air cooling effect is better.

[0025] In the embodiments of the present invention, please refer to Figures 5 to 7 The water-cooling heat dissipation unit 7 includes an inner ring plate 71, which is concentrically arranged outside the main body 31. A retaining ring 72 is integrally connected to the outer circumferential wall of the inner ring plate 71 and is in contact with the edge. A first baffle 73 is also fixed. Both ends of the first baffle 73 are fixed to the retaining ring 72. A plurality of second baffles 74 are axially distributed and concentrically arranged with the inner ring plate 71 and are fixed to the outer circumferential wall of the inner ring plate 71. The second baffle 74 is an unclosed circular ring and is fixed to the first baffle 73 at only one end. A water channel for water flow is formed between the inner ring plate 71, the retaining ring 72, the first baffle 73 and the second baffle 74. A concentric outer ring plate 75 is also provided outside the inner ring plate 71. The outer ring plate 75 is tightly pressed against the baffle ring 72, the first baffle plate 73 and the second baffle plate 74 and sealed by rubber strips. A liquid inlet nozzle 76 and a liquid outlet nozzle 77 connected to the water channel are installed on the outer ring plate 75. At the same time, a fixing ring 78 is fixed to the outside of the main body 31, and a plurality of annularly distributed connecting pieces 79 are fixed to the outside of the circumference of the fixing ring 78. The other end of the connecting piece 79 is fixed to the inner ring plate 71. A channel for air flow is formed between the fixing ring 78 and the inner ring plate 71, and the channel corresponds to the impeller 43. The fixing ring 78 , the connecting piece 79 and the inner ring plate 71 are made of aluminum or copper.

[0026] It should be noted that when the planetary reducer module 3 is water-cooled, the medium is introduced into the water channel from the liquid inlet nozzle 76, and then flows in a ring shape along the water flow, completely covering the main body 31, and finally discharged from the liquid outlet nozzle 77, so as to realize the water cooling operation of the planetary reducer module 3; The fixing ring 78 is fixed to the outside of the main body 31, and its outside is connected to the inner ring plate 71 through the connecting piece 79, which can support the inner ring plate 71. At the same time, a channel is formed between the fixing ring 78 and the inner ring plate 71, and the channel corresponds to the position of the impeller 43. Therefore, during the operation of the impeller 43, the air flow can be introduced into the channel. The fixing ring 78, the connecting piece 79 and the inner ring plate 71 are made of copper or aluminum, which also have good thermal conductivity, and have obvious heat dissipation effect when combined with air cooling; It should be noted that the airflow introduced into the planetary reducer module 3 through the impeller 43 is derived from the motor main body module 1, so it also has a certain amount of heat; and the channel is located between the main body 31 and the water-cooling heat dissipation unit 7, so the heat conducted from the main body 31 to the inside of the area is higher than the heat contained in the airflow, so when the airflow passes through the channel, it can cool the main body 31.

[0027] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A semi-direct drive permanent magnet synchronous frequency conversion integrated machine, comprising a motor main body module (1), a frequency converter module (2) and a planetary reducer module (3), characterized in that: The planetary reducer module (3) is mounted on the front end cover of the motor main body module (1), the output shaft of the motor main body module (1) and the shaft of the planetary reducer module (3) are connected via a spline, and there is a certain interval between the planetary reducer module (3) and the motor main body module (1); An air cooling and heat dissipation unit (4) is installed on the motor main body module (1); an opening for air intake in the air cooling and heat dissipation unit (4) is located at the rear end cover, while an opening for air outlet is located at the front end cover and faces the position of the planetary reducer module (3); the discharged gas also passes through the planetary reducer module (3), thereby achieving air cooling of the planetary reducer module (3); The planetary reducer module (3) is also provided with a water cooling unit (7) for cooperating with the air cooling unit (4) to cool the planetary reducer module (3).

2. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 1, characterized in that: The motor main body module (1) comprises an outer shell portion (11) and a core portion (12) installed inside the outer shell portion (11), and a gap is provided between the outer shell portion (11) and the core portion (12).

3. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 1, characterized in that: The air-cooling heat dissipation unit (4) comprises an air duct (41), the air duct (41) being composed of an outer shell (11), a core (12) and a plurality of partitions fixed therebetween, the air duct (41) being arranged along the length direction of the outer shell (11) so that airflow enters from the rear end of the motor main body module (1) and is discharged from the front end, and a filter end cover (42) covering an air inlet opening is fixed at the rear end of the outer shell (11); An impeller (43) is also fixed on the output shaft of the motor main body module (1), and the impeller (43) corresponds to the air outlet opening at the front end of the motor main body module (1).

4. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 3, characterized in that: A plurality of fins (44) are also installed inside the air duct (41).

5. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 1, characterized in that: A plurality of annularly distributed positioning rods (5) are also fixed to the front end cover of the motor main body module (1); a concentric threaded rod (6) is fixed to the other end of the positioning rod (5); and the diameter of the threaded rod (6) is smaller than the diameter of the positioning rod (5).

6. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 1, characterized in that: The planetary reducer module (3) is composed of a mounting plate (32) and a main body (31) fixed on the mounting plate (32); the mounting plate (32) has a plurality of holes, and the threaded rod (6) passes through the mounting plate (32) through the holes and is fixed by a nut, while the positioning rod (5) is pressed against the mounting plate (32); The impeller (43) in the air-cooling heat dissipation unit (4) is located between the front end cover and the mounting plate (32) of the motor main body module (1).

7. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 1, characterized in that: The water cooling heat dissipation unit (7) comprises an inner ring plate (71), the inner ring plate (71) being concentrically arranged outside the main body (31), a retaining ring (72) being integrally connected to the circumferential outer wall of the inner ring plate (71) and in contact with the edge thereof, and a first retaining plate (73) being fixed thereto, the two ends of the first retaining plate (73) being fixed to the retaining ring (72), a plurality of second retaining plates (74) being axially distributed and concentrically arranged with the inner ring plate (71) being fixed to the circumferential outer wall of the inner ring plate (71), the second retaining plate (74) being an unclosed circular ring and having only one end fixed to the first retaining plate (73), and a water channel for water flow to flow is formed between the inner ring plate (71), the retaining ring (72), the first retaining plate (73) and the second retaining plate (74); A concentric outer ring plate (75) is also provided outside the inner ring plate (71); the outer ring plate (75) is tightly abutted against the baffle ring (72), the first baffle plate (73) and the second baffle plate (74) and sealed by a rubber strip; a liquid inlet nozzle (76) and a liquid outlet nozzle (77) communicating with the water channel are installed on the outer ring plate (75).

8. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 7, characterized in that: A fixing ring (78) is also fixed to the outside of the main body (31), and a plurality of annularly distributed connecting sheets (79) are fixed to the outside of the circumference of the fixing ring (78), and the other end of the connecting sheet (79) is fixed to the inner ring plate (71), and a channel for air flow is formed between the fixing ring (78) and the inner ring plate (71), and the channel corresponds to the impeller (43).

9. The semi-direct drive permanent magnet synchronous frequency conversion integrated machine according to claim 7, characterized in that: The fixing ring (78), the connecting plate (79) and the inner ring plate (71) are made of aluminum or copper.

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