Low-voltage permanent magnet synchronous and three-phase asynchronous motor in a closed frame structure

Abstract

The utility model discloses a closed frame structure medium and low voltage permanent magnet synchronous, three phase asynchronous motor, include: base component, front cover subassembly, rear cover subassembly, rotor and stator, base component includes motor base, and this motor base is the closed frame structure of inner circle outer square, is integrally casted by cast iron or adopts the steel sheet and is formed by the welding, and the outer wall of motor base is installed with the baffle in the circumference, and the baffle and motor base form the air cooling cavity between the enclosure, and the baffle top is equipped with the independent fan that communicates with the air cooling cavity, front cover subassembly includes the front end cover, and is fixedly connected in the front end of motor base, rear cover subassembly includes the rear end cover, and is fixedly connected in the rear end of motor base, and the rotor is rotatably connected between the front end cover and the rear end cover through the bearing, and is coaxially arranged on the central axis of motor base, and the stator is fixed on the inner wall of motor base coaxially, and surrounds the outer periphery of rotor, the utility model provides a closed frame structure medium and low voltage motor with reasonable structure and high -efficient heat dissipation.

Description

Technical Field

[0001] This utility model relates to the technical field of electric motors, specifically to a low-voltage permanent magnet synchronous, three-phase asynchronous motor with a closed frame structure. Background Technology

[0002] With the rapid development of industrial automation and energy-saving technologies, medium and low voltage electric motors are widely used in various industrial applications such as fans, pumps, compressors, and conveying equipment. To meet the requirements of operational stability and energy efficiency under complex working conditions, electric motors not only need to have good electromagnetic performance, but also need to achieve high strength, high heat dissipation efficiency, and intelligent monitoring capabilities in their structural design.

[0003] Traditional medium and low voltage motors mostly adopt external cooling or self-fan cooling structures, whose heat dissipation capacity is limited by ambient temperature and speed. Especially in low-speed or enclosed environments, they are prone to problems such as excessive temperature rise and accelerated insulation aging. In addition, existing motors still have shortcomings in bearing maintenance, condition monitoring, and protection levels, such as lack of real-time temperature monitoring, inconvenient lubrication, and easy intrusion of foreign objects into the bearing area, which affect the long-term reliability and maintenance efficiency of the equipment.

[0004] Permanent magnet synchronous motors and three-phase asynchronous motors, as mainstream drive devices, share common requirements in terms of structural platform design, despite their different working principles. Therefore, developing a closed-frame structure suitable for both types of motors, integrating efficient heat dissipation, intelligent monitoring, convenient maintenance, and high protection performance, has become an important direction for technological upgrading in the industry.

[0005] However, current technologies lack a comprehensive motor structure that can guarantee structural strength while also providing forced air cooling, status visualization, and remote monitoring capabilities. Especially in cooling system design, most products still rely on natural convection or internal circulation cooling, failing to achieve continuous and efficient external forced heat dissipation.

[0006] Therefore, there is an urgent need for a new type of motor structure to solve the problems of low heat dissipation efficiency, weak status perception, and inconvenient maintenance of traditional motors, and to improve the intelligence level and operational reliability of equipment. Utility Model Content

[0007] The purpose of this invention is to provide a low-voltage permanent magnet synchronous three-phase asynchronous motor in a closed frame structure to solve the above-mentioned defects caused by the prior art.

[0008] A low-voltage permanent magnet synchronous three-phase asynchronous motor with a closed frame structure includes: a frame assembly, a front cover assembly, a rear cover assembly, a rotor, and a stator; The base assembly includes a motor base, which is a closed frame structure with an inner circle and an outer square. It is made of cast iron or welded from steel plates. A protective plate is installed on the outer wall of the motor base in a circumferential direction. The protective plate and the motor base enclose a cooling cavity. An independent fan is provided on the top of the protective plate and communicates with the cooling cavity to force air into the cooling cavity and achieve efficient air cooling. The front cover assembly includes a front cover, which is fixedly connected to the front end of the motor base; The rear cover assembly includes a rear end cover, which is fixedly connected to the rear end of the motor base; The rotor is rotatably connected between the front cover and the rear cover via bearings, and is coaxially mounted on the central axis of the motor base; The stator is coaxially fixed to the inner wall of the motor frame and surrounds the outer circumference of the rotor.

[0009] Preferably, the motor base includes a pair of coaxially arranged positioning cylinders, with multiple reinforcing ribs connected between the outer walls of the two positioning cylinders at intervals. Each reinforcing rib has multiple ventilation holes. Multiple reinforcing ribs are connected between adjacent reinforcing ribs, with each reinforcing rib having multiple ventilation holes. The upper and lower sides of the motor base are respectively provided with an upper guard plate and a lower guard plate, and the left and right sides are symmetrically connected with side guard plates. The rear end of the upper guard plate is provided with an air inlet, and the independent fan is installed outside the air inlet. The front end of the side guard plate is provided with an air outlet, and an air outlet mask is provided outside the air outlet.

[0010] Preferably, the air inlet of the independent fan is provided with a wire mesh cover, and a filter element is installed inside the wire mesh cover.

[0011] Preferably, a bearing cover plate 1 is coaxially connected to the outer side of the front end cover, and a bearing oil injection pipe 1 and a temperature sensor 1 are connected to the bearing cover plate 1; a bearing cover plate 2 is coaxially connected to the outer side of the rear end cover, and a bearing oil injection pipe 2 and a temperature sensor 2 are connected to the bearing cover plate 2.

[0012] Preferably, the top of the motor base is provided with a motor junction box; the top of the upper guard plate is provided with a sensor junction box, which integrates a controller, and the controller is electrically connected to temperature sensor one and temperature sensor two respectively.

[0013] Preferably, a tri-color lamp is connected to the front end of the motor base via a fixing plate, and the controller is electrically connected to the tri-color lamp.

[0014] Preferably, a number of lifting rings are evenly distributed on the top of the motor base.

[0015] Preferably, the front and rear ends of the motor base are respectively connected to a front cover and a rear cover.

[0016] Compared with the prior art, the present invention has the following advantages: 1. Highly efficient forced air cooling, providing excellent heat dissipation performance. An independent fan drives external cool air into the air-cooled cavity, which, combined with a crisscrossing ventilation hole structure, forms a multi-path, large-surface-area heat exchange channel, significantly improving heat dissipation efficiency, effectively reducing motor temperature rise, and extending insulation life. It is suitable for high-load, continuous operation conditions.

[0017] 2. High structural strength and strong versatility The motor base adopts a closed frame structure with an inner circle and an outer square, formed by integral casting of cast iron or welding of steel plates, combining high rigidity with good machinability. This structural platform is compatible with permanent magnet synchronous motors and three-phase asynchronous motors, enabling product serialization and modular production, and reducing manufacturing costs. Furthermore, the steel plate welded structure used in this application reduces machine tool cutting, avoiding defects such as rapid tool wear and poor dimensional accuracy of machined surfaces caused by intermittent cutting of steel parts.

[0018] 3. Intelligent status monitoring ensures safe and reliable operation. Equipped with front and rear dual temperature sensors and controllers, it enables real-time monitoring of bearing temperature; combined with three-color lights, it provides visual prompts of operating status, and has over-temperature warning and automatic protection functions, improving the intelligence level and operational safety of the equipment.

[0019] 4. High protection level and strong adaptability With its enclosed overall structure, combined with an exhaust mask and an intake filtration system, it effectively resists the effects of harsh environments such as dust and humidity, making it suitable for complex working conditions in industrial sites.

[0020] This invention provides a low-voltage motor with a closed frame structure that is structurally sound, has high heat dissipation efficiency, is intelligent and reliable, and is easy to maintain. It is particularly suitable for industrial drive systems with high requirements for heat dissipation performance, operational stability, and intelligence, and has broad market application prospects and promotional value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall assembly of this utility model.

[0022] Figure 2 This is a schematic diagram of the overall explosion structure of this utility model.

[0023] Figure 3 A schematic diagram of the overall assembly of the base assembly.

[0024] Figure 4 This is a schematic diagram of the overall explosion of the base assembly.

[0025] Figure 5 This is a schematic diagram of the motor base in the base assembly.

[0026] Figure 6 This is a schematic diagram of the structure of an independent fan in the base assembly.

[0027] Figure 7 A schematic diagram of the overall assembly of the front cover assembly.

[0028] Figure 8 This is a structural diagram of the front cover assembly after an explosion.

[0029] Figure 9 A schematic diagram of the overall assembly of the back cover component.

[0030] Figure 10 This is a schematic diagram of the structure of the back cover assembly after an explosion.

[0031] Figure 11 This is a schematic diagram of a self-cooled motor with a closed frame structure.

[0032] Figure 12 for Figure 11 A schematic diagram of the closed-frame structure of the motor base.

[0033] in: 10-Base assembly; 101-Positioning cylinder; 102-Reinforcing rib one; 102a-Ventilation hole one; 103-Reinforcing rib two; 103a-Ventilation hole two; 104-Upper guard plate; 104a-Air inlet; 105-Side guard plate; 105a-Air outlet; 106-Lower guard plate; 108-Independent fan; 109-Wire mesh cover; 110-Filter screen / filter element; 111-Motor junction box; 112-Sensor junction box; 113-Exhaust mask; 114-Tricolor light; 115-Fixing plate; 116-Lifting ring; 20-Front cover assembly; 201-Front end cover; 202-Bearing cover plate one; 203-Bearing oil injection pipe one; 204-Temperature sensor one; 205-Front end cover protective cover; 30-Rear cover assembly; 301-Rear end cover; 302-Bearing cover plate II; 303-Bearing oil injection pipe II; 304-Temperature sensor II; 305-Rear end cover protective cover; 40-rotor; 50-Stator. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0035] like Figures 1 to 10As shown, a low-voltage permanent magnet synchronous three-phase asynchronous motor with a closed frame structure includes: a frame assembly 10, a front cover assembly 20, a rear cover assembly 30, a rotor 40, and a stator 50. The base assembly 10 includes a motor base, which is a closed frame structure with an inner circle and an outer square. It is made of cast iron or welded from steel plates. A protective plate is installed on the outer wall of the motor base in a circumferential direction. The protective plate and the motor base enclose a cooling cavity. An independent fan 108 communicating with the cooling cavity is provided on the top of the protective plate for forced air supply into the cooling cavity to achieve efficient air cooling heat dissipation. The front cover assembly 20 includes a front cover 201, which is fixedly connected to the front end of the motor base; The rear cover assembly 30 includes a rear end cover 301, which is fixedly connected to the rear end of the motor base; The rotor 40 is rotatably connected between the front cover 201 and the rear cover 301 via bearings, and is coaxially mounted on the central axis of the motor base; The stator 50 is coaxially fixed to the inner wall of the motor base and surrounds the outer periphery of the rotor 40.

[0036] In this embodiment, the motor base includes a pair of coaxially arranged positioning cylinders 101. Multiple reinforcing ribs 102 are connected between the outer walls of the two positioning cylinders 101 at intervals. Each reinforcing rib 102 has multiple ventilation holes 102a. Multiple reinforcing ribs 103 are connected between adjacent reinforcing ribs 102. Each reinforcing rib 103 has multiple ventilation holes 103a. The upper and lower sides of the motor base are respectively provided with an upper guard plate 104 and a lower guard plate 106. Side guard plates 105 are symmetrically connected on the left and right sides. The rear end of the upper guard plate 104 is provided with an air inlet 104a. An independent fan 108 is installed outside the air inlet 104a to introduce external cooling air into the air-cooled cavity. The front end of the side guard plate 105 is provided with an air outlet 105a. An air outlet mask 113 is provided outside the air outlet 105a to guide hot air out in a directional manner. The cold air first enters the air-cooled cavity through the air inlet 104a. The cold air will pass through the crisscrossing ventilation holes 102a and 103a. During this period, the cold air will fully exchange heat with the heated motor base and stator 50, absorb heat, and form hot air. Finally, it will be discharged from the air-cooled cavity through the air outlet 105a.

[0037] In this embodiment, a wire mesh cover 109 is provided at the air intake of the independent fan 108. A filter element 110 is installed inside the wire mesh cover 109 to filter dust and impurities in the cooling air and prevent blockage of the air duct.

[0038] In this embodiment, a bearing cover plate 202 is coaxially connected to the outer side of the front cover 201, and a bearing oil injection pipe 203 and a temperature sensor 204 are connected to the bearing cover plate 202. A bearing cover plate 302 is coaxially connected to the outer side of the rear cover 301, and a bearing oil injection pipe 303 and a temperature sensor 304 are connected to the bearing cover plate 302. The bearing oil injection pipe 203 is used to add grease to the front bearing, and the temperature sensor 204 is used to monitor the temperature of the front bearing in real time. The bearing oil injection pipe 303 is used to add grease to the rear bearing, and the temperature sensor 304 is used to monitor the temperature of the rear bearing in real time.

[0039] In this embodiment, a motor junction box 111 is provided on the top of the motor base for connecting the main power supply line; a sensor junction box 112 is provided on the top of the upper protective plate 104, which integrates a controller. The controller is electrically connected to temperature sensor 204 and temperature sensor 304 respectively, for receiving temperature signals and realizing over-temperature alarm or automatic protection. The motor junction box 111 is a device specifically designed for electric motors, mainly used to connect the internal windings of the motor to the external power supply and control system cables. The sensor junction box 112 is mainly used to connect and protect the cable connection between the sensor and the control system, ensuring the stability and reliability of signal transmission.

[0040] In this embodiment, a tri-color light 114 is connected to the front end of the motor base via a fixing plate 115. The controller is electrically connected to the tri-color light 114 and is used to indicate the motor's operating status, including normal operation, alarm, or shutdown status. For example, a red light can indicate an alarm or fault status, a yellow light can indicate a warning or standby status, and a green light can indicate normal operation or ready status.

[0041] In this embodiment, a number of lifting rings 116 are evenly distributed on the top of the motor base for lifting and transporting the motor, ensuring balance of the center of gravity and lifting safety.

[0042] In this embodiment, the front end cover 205 and the rear end cover 305 are respectively connected to the front and rear ends of the motor base to prevent foreign objects from entering the bearing area and improve the safety and protection level of the equipment operation.

[0043] Working principle of a low-voltage permanent magnet synchronous three-phase asynchronous motor in a closed frame structure: When the motor starts, the independent fan 108 starts synchronously or with a delay. External cold air enters the air-cooling cavity through the air inlet 104a, first passing through the wire mesh cover 109 and the filter element 110 to remove dust and impurities, ensuring clean cooling air. The cold air flows along the outer wall of the motor base within the air-cooling cavity, passing sequentially through the ventilation holes 102a on the first reinforcing rib 102 and the second ventilation holes 103a on the second reinforcing rib 103, forming a crisscrossing airflow channel. During this process, the cold air fully exchanges heat with the heated motor base and the internal stator 50, absorbing heat and becoming hot air, which is finally discharged from the air outlet 105a at the front end of the side guard plate 105, and guided directionally by the air outlet mask 113, completing the forced air-cooling cycle.

[0044] During operation, temperature sensors 204 and 304, installed on the front and rear bearing cover plates, collect bearing temperature signals in real time and transmit the data to the controller inside the sensor junction box 112. The controller analyzes and processes the received signals: if the temperature exceeds a preset threshold, an over-temperature alarm is triggered, and the tri-color indicator 114 is controlled via electrical connection to display a red light, prompting the operator to stop the machine for inspection in time; a green light is displayed during normal operation, and a yellow light is displayed during standby or warning, realizing visualization of the operating status.

[0045] In summary, this motor achieves a harmonious balance between efficient heat dissipation, reliable operation, and convenient maintenance through forced air cooling, intelligent monitoring, and modular structural design.

[0046] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A low-voltage permanent magnet synchronous, three-phase asynchronous motor with a closed frame structure, characterized in that, include: The frame assembly (10), the front cover assembly (20), the rear cover assembly (30), the rotor (40), and the stator (50); The base assembly (10) includes a motor base, which is a closed frame structure with an inner circle and an outer square. It is made of cast iron or welded from steel plates. A protective plate is installed on the outer wall of the motor base in the circumferential direction. The protective plate and the motor base enclose a cooling cavity. An independent fan (108) is provided on the top of the protective plate and communicates with the cooling cavity to force air into the cooling cavity and achieve efficient air cooling. The front cover assembly (20) includes a front cover (201) which is fixedly connected to the front end of the motor base; The rear cover assembly (30) includes a rear end cover (301), which is fixedly connected to the rear end of the motor base; The rotor (40) is rotatably connected between the front end cover (201) and the rear end cover (301) via bearings, and is coaxially mounted on the central axis of the motor base; The stator (50) is coaxially fixed to the inner wall of the motor base and surrounds the outer periphery of the rotor (40).

2. The low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 1, characterized in that, The motor base includes a pair of coaxially arranged positioning cylinders (101). Multiple reinforcing ribs (102) are connected between the outer walls of the two positioning cylinders (101) at intervals. Each reinforcing rib (102) has multiple ventilation holes (102a). Multiple reinforcing ribs (103) are connected between adjacent reinforcing ribs (102). Each reinforcing rib (103) has multiple ventilation holes (103a). The upper and lower sides of the motor base are respectively provided with an upper guard plate (104) and a lower guard plate (106). Side guard plates (105) are symmetrically connected on the left and right sides. The rear end of the upper guard plate (104) is provided with an air inlet (104a). The independent fan (108) is installed outside the air inlet (104a). The front end of the side guard plate (105) is provided with an air outlet (105a). An air outlet mask (113) is provided outside the air outlet (105a).

3. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 2, characterized in that, The independent fan (108) is provided with a wire mesh cover (109) at the air intake, and a filter screen (110) is installed inside the wire mesh cover (109).

4. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 1, characterized in that, The outer side of the front cover (201) is coaxially connected to a bearing cover plate 1 (202), and a bearing oil injection pipe 1 (203) and a temperature sensor 1 (204) are connected on the bearing cover plate 1 (202); the outer side of the rear cover (301) is coaxially connected to a bearing cover plate 2 (302), and a bearing oil injection pipe 2 (303) and a temperature sensor 2 (304) are connected on the bearing cover plate 2 (302).

5. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 2, characterized in that, The top of the motor base is provided with a motor junction box (111); the top of the upper guard plate (104) is provided with a sensor junction box (112), which integrates a controller. The controller is electrically connected to temperature sensor one (204) and temperature sensor two (304) respectively.

6. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 5, characterized in that, The front end of the motor base is connected to a tri-color lamp (114) via a fixing plate (115), and the controller is electrically connected to the tri-color lamp (114).

7. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 1, characterized in that, The top of the motor base has several lifting rings (116) evenly distributed.

8. A low-voltage permanent magnet synchronous, three-phase asynchronous motor in a closed frame structure according to claim 1, characterized in that, The front and rear ends of the motor base are respectively connected to a front cover protective cover (205) and a rear cover protective cover (305).

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