Permanent magnet motor with damping and torque ripple elimination

Abstract

This invention discloses a permanent magnet motor for shock absorption and torque fluctuation elimination, relating to the field of permanent magnet motor technology. It includes a motor housing, a stator, a rotor, and a heat dissipation assembly. The motor housing has an air inlet and an air outlet for airflow. A centrifugal impeller is provided at the shaft end of the rotor, forming an air gap between the stator and rotor. The heat dissipation assembly includes a heat dissipation cylinder with multiple axially extending heat dissipation fins, forming a heat dissipation channel between adjacent fins. A negative pressure suction channel is provided on the heat dissipation cylinder, with one end connected to the air gap and the other end connected to the heat dissipation channel. The air gap is connected to the air inlet via an air intake path, constructing an "air gap hot zone suction system" that requires no additional power. This system forcibly extracts the hot air from the most difficult-to-dissipate area of ​​the stator-rotor gap and mixes it with the main airflow for heat dissipation, significantly reducing the core temperature rise of the motor and ensuring the performance and operational reliability of the permanent magnet motor.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, specifically a permanent magnet motor that reduces vibration and eliminates torque fluctuations. Background Technology

[0002] By removing a portion of the iron core from the rotor surface and smoothing it, torque fluctuations can be reduced, extending the motor's lifespan. However, the reliability and lifespan of permanent magnet motors are severely limited by temperature rise and environmental factors. The core heat-generating area inside the permanent magnet motor (the air gap between the stator and rotor) becomes a heat dissipation challenge due to structural limitations. Furthermore, in humid and dusty industrial environments, moisture in the intake air easily condenses, causing a decrease in electrical insulation, while dust accumulation clogs air ducts and worsens heat dissipation. Existing dehumidification and filtration components often require cumbersome regeneration and maintenance, necessitating downtime and reducing the equipment's continuous operating capacity and economic efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a permanent magnet motor that reduces vibration and eliminates torque fluctuations, thereby solving the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a permanent magnet motor for shock absorption and torque fluctuation elimination, comprising a motor housing, a stator, a rotor, and a heat dissipation assembly, wherein the motor housing is provided with an air inlet and an air outlet for air flow, the rotor shaft end is provided with a centrifugal impeller, and an air gap is formed between the stator and the rotor; The heat dissipation assembly includes a heat dissipation cylinder and a plurality of heat dissipation fins extending axially from the heat dissipation cylinder, with heat dissipation air ducts formed between adjacent heat dissipation fins; The heat sink is provided with a negative pressure suction channel. One end of the negative pressure suction channel is connected to the air gap, and the other end is connected to the heat dissipation air duct. The air gap is connected to the air inlet through the air intake path.

[0005] The heat sink is mounted on the motor housing, and the heat dissipation duct is mounted on the heat sink. The two ends of the heat dissipation duct are connected to the air inlet and the air outlet, respectively. The heat dissipation duct has a venturi tube-shaped cross-section, which includes a converging section with a gradually decreasing cross-section, a throat with the smallest cross-sectional area, and an expanding section with a gradually increasing cross-sectional area along the airflow direction. The throat is connected to the negative pressure suction channel.

[0006] The air intake path is a return air pipe, and a filter screen is installed inside the return air pipe. Solenoid valves and flow meters are installed in both the negative pressure suction channel and the return air pipe. The solenoid valves and flow meters are electrically connected to the control system.

[0007] It also includes a dehumidification component, a coil, and a filter component, which are sequentially arranged on one side of the heat dissipation cylinder; The dehumidification assembly includes a circular plate and multiple dehumidification plates. The circular plate is disposed on the motor housing, and a return chamber is disposed at its top and bottom. The two ends of the dehumidification plates are respectively connected to the return chambers on both sides. The dehumidification plates are hollow inside and communicate with the return chambers. A dehumidification material is disposed on the outside of the dehumidification plates. The dehumidification plates are made of metal and are located within the magnetic field range of the coil.

[0008] One of the return chambers is connected to the outside through a pipe extending out of the motor housing, and the other return chamber is connected to the air outlet through a connecting pipe extending out of the motor housing. The connecting pipe is detachable, and both the connecting pipe and the pipe connecting one of the return chambers are equipped with a solenoid valve and a flow meter.

[0009] The filter assembly includes a fixed ring, a sliding ring, a first dust removal cloth, and a second dust removal cloth. The fixed ring is disposed on the motor housing, the sliding ring is slidably disposed on the motor housing, and a return spring is connected between the sliding ring and the motor housing. The first dust removal cloth and the second dust removal cloth are respectively disposed on the fixed ring and the sliding ring, and an extension cloth is connected between the first dust removal cloth and the second dust removal cloth.

[0010] A magnet is provided on one side of the sliding ring, and the magnetic field of the magnet is directly opposite to the magnetic field of the coil.

[0011] The filter pore size of the first dust removal cloth is smaller than that of the second dust removal cloth.

[0012] The bottom of the motor housing is provided with a shock-absorbing pad, which provides shock absorption for the motor.

[0013] The air inlet is equipped with a coarse dust removal cloth, and the stator and rotor are equipped with torque sensors.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. High-efficiency cooling system. By setting up a venturi tube-shaped heat dissipation air duct and a negative pressure suction flow channel, the main airflow driven by the centrifugal impeller generates a significant negative pressure at the throat of the air duct; a "gap hot zone suction system" that does not require additional power is constructed, which continuously extracts the hot air in the stator-rotor gap that is difficult to dissipate heat and mixes it with the main airflow for heat dissipation, which significantly reduces the temperature rise of the motor core and ensures the performance and operational reliability of the permanent magnet motor.

[0015] 2. Dual internal and external regeneration modes ensure continuous use of the dehumidifier plate. Through the coordinated design of the dehumidifier components and electromagnetic coils, the exhaust heat is used to internally heat the dehumidifier plate, while the alternating magnetic field of the coils induces eddy currents for external heating. This achieves a highly efficient regeneration mode of "dual internal and external heating," which not only utilizes the system's own waste heat and electromagnetic energy to quickly and evenly restore dehumidification capacity, but also ensures the continuous drying of the air entering the motor, preventing internal condensation, and significantly reducing regeneration energy consumption and maintenance requirements.

[0016] 3. Filtration and cleaning process to ensure filtration effectiveness. Through the installation of movable filter components, an alternating magnetic field generated by an energized coil drives a sliding ring with magnets to reciprocate, causing the first and second dust-collecting cloths to periodically loosen and tighten. This combination of electromagnetic drive and mechanical vibration enables online self-cleaning of the filter media, automatically shaking off accumulated dust, maintaining unobstructed cooling airflow and stable heat dissipation efficiency, and reducing the frequency of downtime for cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the centrifugal impeller in this invention; Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a schematic diagram of the heat sink in this invention; Figure 5 This is a schematic diagram of the sliding ring structure in this invention; Figure 6 This is a schematic diagram of the dehumidification plate in this invention; Figure 7 This is a schematic diagram of the heat dissipation fins in this invention.

[0018] In the diagram: 1. Motor housing; 101. Air inlet; 102. Air outlet; 11. Stator; 12. Rotor; 121. Centrifugal impeller; 13. Air gap; 2. Heat dissipation assembly; 21. Heat dissipation cylinder; 22. Heat dissipation fins; 23. Heat dissipation duct; 231. Converging section; 232. Throat; 233. Expansion section; 3. Negative pressure suction channel; 4. Dehumidification assembly; 41. Circular plate; 42. Dehumidification plate; 5. Coil; 6. Filter assembly; 61. Fixed ring; 62. Sliding ring; 63. First dust removal cloth; 64. Second dust removal cloth; 7. Shock-absorbing pad. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Figure 1 - Figure 7 As shown, the device includes a motor housing 1, a stator 11, a rotor 12, and a heat dissipation assembly 2. The motor housing 1 is provided with an air inlet 101 and an air outlet 102 for airflow. The rotor 12 has a centrifugal impeller 121 at its shaft end. An air gap 13 is formed between the stator 11 and the rotor 12. The heat dissipation assembly 2 includes a heat dissipation cylinder 21 with multiple heat dissipation fins 22 extending axially from the heat dissipation cylinder 21. A heat dissipation air duct 23 is formed between adjacent heat dissipation fins 22. A negative pressure suction channel 3 is provided on the heat dissipation cylinder 21. One end of the negative pressure suction channel 3 is connected to the air gap 13, and the other end is connected to the heat dissipation air duct 23. The air gap 13 is connected to the air inlet 101 through an air intake path. A shock-absorbing pad 7 is provided at the bottom of the motor housing 1 to dampen the motor.

[0021] The heat sink 21 is mounted on the motor housing 1, and the heat dissipation duct 23 is mounted on the heat sink 21. The two ends of the heat dissipation duct 23 are connected to the air inlet 101 and the air outlet 102, respectively. The cross-section of the heat dissipation duct 23 is venturi-shaped, and along the airflow direction, it includes a converging section 231 with a gradually decreasing cross-section, a throat 232 with the smallest cross-sectional area, and an expanding section 233 with a gradually increasing cross-sectional area. The throat 232 is connected to the negative pressure suction channel 3. The air inlet path is a return pipe, and a filter screen is installed inside the return pipe (not shown in the figure). Solenoid valves and flow meters are installed in both the negative pressure suction channel 3 and the return pipe. The solenoid valves and flow meters are electrically connected to the control system.

[0022] It also includes a dehumidification component 4, a coil 5, and a filter component 6, which are sequentially arranged on one side of the heat sink 21. The dehumidification component 4 includes a circular ring plate 41 and multiple dehumidification plates 42. The circular ring plate 41 is set on the motor housing 1, and its top and bottom are respectively provided with return chambers. The two ends of the dehumidification plates 42 are respectively connected to the return chambers on both sides. The dehumidification plates 42 are hollow inside and communicate with the return chambers. The dehumidification material is provided on the outside of the dehumidification plates 42, and the dehumidification plates 42 are made of metal and located within the magnetic field range of the coil 5. One of the return chambers is connected to the outside through a pipe through the motor housing 1, and the other return chamber is connected to the air outlet 102 through a connecting pipe through the motor housing 1. The connecting pipe is detachable. Solenoid valves and flow meters are installed in the connecting pipe and the pipe connecting one of the return chambers.

[0023] The humid air from the air inlet 101 is filtered by the filter assembly 6 and then comes into contact with multiple dehumidification plates 42. The dehumidification material on the outer surface of the dehumidification plates 42 absorbs the moisture in the air, making the air entering the motor dry and preventing internal condensation.

[0024] When the dehumidifier plate 42 needs to be regenerated, the operator connects another return chamber and the air outlet 102 through a connecting pipe and opens the solenoid valve in the connecting pipe. Part of the hot air discharged from the air outlet 102 is guided through the connecting pipe to one of the return chambers of the annular plate 41 and flows into the hollow dehumidifier plate 42. This waste heat serves as a heat source, heating the dehumidifier plate 42 from the inside, thus regenerating the dehumidifier plate 42. The air after heat exchange is discharged into the atmosphere through another return chamber and pipe. At the same time, the control system energizes the coil 5, causing the coil 5 to generate an alternating magnetic field. The dehumidifier plate 42 is simultaneously in the alternating magnetic field of the coil 5, which generates an eddy current effect. The metal body of the dehumidifier plate 42 will heat up, and the dehumidifier plate 42 will heat the dehumidifying material on the outside. Through the combined action of "internal heating of hot air" and "external heating of vortex", the overall temperature of the dehumidification plate 42 is rapidly and evenly increased, causing the moisture adsorbed on the dehumidification material to evaporate and achieve regeneration.

[0025] The filter assembly 6 includes a fixed ring 61, a sliding ring 62, a first dust removal cloth 63, and a second dust removal cloth 64. The fixed ring 61 is disposed on the motor housing 1, and the sliding ring 62 is slidably disposed on the motor housing 1. A return spring is connected between the sliding ring 62 and the motor housing 1. The first dust removal cloth 63 and the second dust removal cloth 64 are respectively disposed on the fixed ring 61 and the sliding ring 62. An extension cloth is connected between the first dust removal cloth 63 and the second dust removal cloth 64. The filter pore size of the first dust removal cloth 63 is smaller than that of the second dust removal cloth 64. A magnet is disposed on one side of the sliding ring 62, and the magnetic field of the magnet is directly opposite to the magnetic field of the coil 5.

[0026] In the filter cleaning mode (the working mode of the filter component 6), the coil 5 generates an alternating magnetic field to drive the sliding ring 62 to move back and forth, while in the dehumidification regeneration mode it is used to heat the dehumidification plate 42. The control system coordinates the two modes to avoid them operating simultaneously.

[0027] When it is necessary to clean the first dust removal cloth 63 and the second dust removal cloth 64, the control system energizes the coil 5. The positive magnetic field generated by the energized coil 5 repels the magnetic field of the magnet on the sliding ring 62. Under the action of the repulsive force, the magnet drives the sliding ring 62 to approach the fixed ring 61. While the sliding ring 62 moves, it compresses the return spring. The sliding ring 62 drives the second dust removal cloth 64 to move synchronously. The distance between the first dust removal cloth 63 and the second dust removal cloth 64 is shortened. The first dust removal cloth 63, the second dust removal cloth 64 and the extension cloth are all in a relaxed state. When the reverse magnetic field generated by the coil 5 is energized attracts the magnet on the sliding ring 62, the magnet drives the sliding ring 62 away from the fixed ring 61 under the action of the attraction. At the same time, the reset spring is released, and the sliding ring 62 drives the second dust removal cloth 64 to move synchronously. The distance between the first dust removal cloth 63 and the second dust removal cloth 64 increases, and the first dust removal cloth 63, the second dust removal cloth 64 and the extension cloth are all in a taut state. The coil 5 continuously generates a positive magnetic field and a reverse magnetic field, causing the sliding ring 62 to move back and forth. The sliding ring 62 drives the first dust removal cloth 63 and the second dust removal cloth 64 to continuously relax and tighten, so that the dust on the first dust removal cloth 63 and the second dust removal cloth 64 falls off, ensuring that the first dust removal cloth 63 and the second dust removal cloth 64 have a good dust removal effect.

[0028] Working principle: The control system drives the output shaft of the rotor 12 to rotate through the cooperation of the stator 11 and the rotor 12. The output shaft of the rotor 12 drives the centrifugal impeller 121 to rotate. The centrifugal impeller 121 drives the external cooling airflow to enter from the air inlet 101. After the cooling airflow passes through the dust removal and dehumidification, when the cooling airflow flows through the Venturi tube-shaped heat dissipation air duct 23, a negative pressure is generated at the throat 232. The hot air that is most difficult to dissipate in the air gap 13 is continuously extracted through the negative pressure suction flow channel 3. After mixing with the main airflow, it becomes a hot airflow with a higher temperature, and finally it is discharged from the air outlet 102. During the process of the centrifugal impeller 121 driving the cooling airflow, part of the cooling airflow after dust removal and dehumidification enters the air gap 13 through the return air pipe, which cools the stator 11 and rotor 12 on both sides of the air gap 13. The heat-exchange cooling airflow is extracted through the negative pressure suction channel 3 and mixed with the main airflow before being discharged from the outlet 102.

[0029] 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 invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A permanent magnet motor with vibration damping and torque ripple cancellation, characterized by: The motor housing (1), stator (11), rotor (12) and heat dissipation assembly (2) are provided. The motor housing (1) is provided with an air inlet (101) and an air outlet (102) for air flow. The rotor (12) is provided with a centrifugal impeller (121) at the shaft end. An air gap (13) is formed between the stator (11) and the rotor (12). The heat dissipation assembly (2) includes a heat dissipation cylinder (21) with a plurality of heat dissipation fins (22) extending axially from the heat dissipation cylinder (21), and a heat dissipation air duct (23) is formed between adjacent heat dissipation fins (22). The heat sink (21) is provided with a negative pressure suction channel (3). One end of the negative pressure suction channel (3) is connected to the air gap (13), and the other end is connected to the heat dissipation air duct (23). The air gap (13) is connected to the air inlet (101) through the air inlet path. It also includes a dehumidification component (4), a coil (5) and a filter component (6), which are arranged sequentially on one side of the heat sink (21); The dehumidification assembly (4) includes a ring plate (41) and multiple dehumidification plates (42). The ring plate (41) is disposed on the motor housing (1), and a return chamber is disposed at its top and bottom respectively. The two ends of the dehumidification plate (42) are respectively connected to the return chambers on both sides. The dehumidification plate (42) is hollow inside and communicates with the return chambers. The dehumidification material is disposed on the outside of the dehumidification plate (42), and the dehumidification plate (42) is made of metal and is located within the magnetic field range of the coil (5). The filter assembly (6) includes a fixed ring (61), a sliding ring (62), a first dust removal cloth (63), and a second dust removal cloth (64). The fixed ring (61) is disposed on the motor housing (1), the sliding ring (62) is slidably disposed on the motor housing (1), and a return spring is connected between the sliding ring (62) and the motor housing (1). The first dust removal cloth (63) and the second dust removal cloth (64) are respectively disposed on the fixed ring (61) and the sliding ring (62), and an extension cloth is connected between the first dust removal cloth (63) and the second dust removal cloth (64). A magnet is provided on one side of the sliding ring (62), and the magnetic field of the magnet is directly opposite to the magnetic field of the coil (5).

2. The vibration-damping and torque fluctuation-eliminating permanent magnet motor according to claim 1, characterized in that: The heat sink (21) is mounted on the motor housing (1), and the heat dissipation duct (23) is mounted on the heat sink (21). The two ends of the heat dissipation duct (23) are connected to the air inlet (101) and the air outlet (102) respectively. The heat dissipation duct (23) has a venturi tube-shaped cross section, which includes a converging section (231) with a gradually decreasing cross section, a throat (232) with the smallest cross section area, and an expanding section (233) with a gradually increasing cross section area along the airflow direction. The throat (232) is connected to the negative pressure suction duct (3).

3. The vibration-damping and torque fluctuation-eliminating permanent magnet motor according to claim 2, characterized in that: The air intake path is a return air pipe, and a filter screen is installed inside the return air pipe. Solenoid valves and flow meters are installed in both the negative pressure suction channel (3) and the return air pipe. The solenoid valves and flow meters are electrically connected to the control system.

4. A permanent magnet motor for damping and eliminating torque fluctuations according to claim 1, characterized in that: One of the return chambers is connected to the outside through a pipe through the motor housing (1), and the other return chamber is connected to the air outlet (102) through a connecting pipe through the motor housing (1). The connecting pipe is detachable, and both the connecting pipe and the pipe connecting one of the return chambers are equipped with a solenoid valve and a flow meter.

5. A permanent magnet motor for damping and eliminating torque fluctuations according to claim 1, characterized in that: The filter pore size of the first dust removal cloth (63) is smaller than that of the second dust removal cloth (64).

6. A permanent magnet motor for damping and eliminating torque fluctuations according to claim 5, characterized in that: The bottom of the motor housing (1) is provided with a shock-absorbing pad (7), which provides shock absorption for the motor.

7. A permanent magnet motor for damping and eliminating torque fluctuations according to claim 1, characterized in that: The air inlet (101) is provided with a coarse dust removal cloth, and the stator (11) and rotor (12) are provided with torque sensors.

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