Permanent magnet motor with built-in driver

Abstract

The utility model provides a permanent magnet motor with a built-in driver. The permanent magnet motor comprises a stator assembly and a rotor assembly. The stator assembly is composed of an iron core with a winding and a liquid cooling machine shell. The liquid cooling machine shell comprises a tail base. The rotor assembly comprises a rotating shaft, a rotor iron core and a front flange; a cavity is formed in the tail base, and the cavity is provided with a space for placing a driver; a cable is arranged on an outer machine of the permanent magnet motor and used for leading out a power source and a control signal of the driver; the driver is connected with the iron core with the winding through a leading-out cable; a sealing structure is arranged between the front flange and the liquid-cooled casing, and a sealing structure is arranged between the tail base and the cable; a radiating rib plate is arranged at the tail end of the tail base; through integrated design, the variable-frequency driver is arranged in the motor, so that the application efficiency of the variable-frequency permanent magnet submersible motor in a sewage treatment system is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency permanent magnet submersible motors, in particular to a driver built-in permanent magnet motor. Background Art

[0002] Variable frequency permanent magnet submersible motors play a vital role in municipal sewage treatment systems and are widely used in key facilities such as mixing tanks. In existing system configurations, submersible motors are usually placed at the bottom of the mixing tank, while variable frequency control cabinets are placed next to the sewage tank. The connection between the two relies on cables. This layout requires the construction of a separate control cabinet around the tank, which increases construction and material costs.

[0003] There are also designs on the market that directly connect the inverter to the motor, commonly known as the "backpack type". This design reduces the use of cables, but if it is used in an underwater environment, additional protection measures are required for both the motor and the inverter.

[0004] The cost of setting up a separate inverter control cabinet is high, including material, construction and maintenance costs. In addition, although the backpack design reduces the use of cables to a certain extent, the cost and complexity of its protective measures cannot be ignored. The underwater environment has extremely high protection requirements for motors and inverters. It is necessary to ensure that the equipment can withstand water pressure, corrosion and microbial growth. Taking protective measures for the inverter alone not only increases costs, but also increases the risk of leakage. Utility Model Content

[0005] The utility model aims to solve the problem that the existing variable frequency permanent magnet submersible motor needs to be equipped with a variable frequency drive cabinet on site, which is costly and difficult to construct. The utility model provides a permanent magnet motor with built-in driver. Through integrated design, the variable frequency drive is built into the motor, thereby improving the application efficiency of the variable frequency permanent magnet submersible motor in the sewage treatment system and reducing the cost.

[0006] In order to solve the above technical problems, the utility model provides a driver built-in permanent magnet motor, which includes a stator assembly and a rotor assembly; the stator assembly is composed of a winding iron core and a liquid cooling casing, and the liquid cooling casing includes a tail base; the rotor assembly includes a rotating shaft, a rotor iron core and a front flange;

[0007] A cavity is provided in the tail base, and the cavity has a space for placing the driver; a cable is provided on the outer machine of the permanent magnet motor for leading out the power source and control signal of the driver; the driver is connected to the winding core through the lead-out cable;

[0008] A sealing structure is arranged between the front flange and the liquid cooling housing, and between the tail base and the cable; a heat dissipation rib plate is arranged at the tail end of the tail base.

[0009] In a preferred embodiment, the shaft assembly is provided with an impeller, a first front flange, a second front flange and a rear flange in sequence along the shaft;

[0010] A pair of angular contact ball bearings are arranged between the second front flange and the rotating shaft; and a deep groove ball bearing is arranged between the rear flange and the rotating shaft.

[0011] In a preferred embodiment, the winding core is arranged between the second front flange and the rear flange.

[0012] In a preferred embodiment, a sealant and a first O-ring are used to form a sealing structure between the first front flange and the end surface of the liquid cooling housing; a second O-ring is provided between the second front flange and the inner side wall of the liquid cooling housing to form a sealing structure;

[0013] The rear flange and the tail base are sealed with the liquid cooling casing by using sealant and a sealant pad.

[0014] In a preferred embodiment, a first mechanical seal and a second mechanical seal are arranged on the rotating shaft, the first mechanical seal is arranged at the front end of the first front flange, and the second mechanical seal is arranged at the front end of the second front flange.

[0015] In a preferred embodiment, the first mechanical seal and the second mechanical seal are bellows mechanical seals.

[0016] In a preferred embodiment, the impeller, the first front flange, the second front flange, the rotating shaft, the liquid cooling casing, and the tail base are all made of stainless steel.

[0017] In a preferred embodiment, the heat dissipation rib is welded to the tail base.

[0018] In a preferred embodiment, a watertight head is provided at the end where the cable is connected to the tail base to form a sealing structure.

[0019] In a preferred embodiment, the permanent magnet motor is a variable frequency permanent magnet motor.

[0020] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0021] 1. By setting the driver inside the motor, the need to install a variable frequency drive cabinet on site for the variable frequency permanent magnet submersible motor is eliminated, which facilitates the convenience of on-site engineering construction and reduces related engineering costs. In addition, this structure can use the existing protection structure of the motor to solve the protection difficulties and heat dissipation difficulties of the underwater motor drive motor.

[0022] 2. The driver and motor are designed as an integral unit and built into the motor. This can reduce the use of external cables and reduce the cost of construction and protective measures. The modular design allows the driver and motor to be installed and maintained as a whole, simplifying the construction process.

[0023] 3. Placing the driver inside the motor can reduce the impact of the external environment on the inverter, improve the reliability and stability of the system, and at the same time install heat dissipation ribs to improve heat dissipation to ensure good performance even in underwater environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of the internal structure of the permanent magnet motor in the preferred embodiment of the utility model;

[0025] Figure 2 for Figure 1 A magnified view of part A;

[0026] Figure 3 It is the overall front view of the permanent magnet motor in the preferred embodiment of the utility model.

[0027] Explanation of the accompanying drawings: 1. Winding core; 2. Liquid-cooled casing; 3. Rotating shaft; 4. Impeller; 5. First mechanical seal; 6. First front flange; 7. Second mechanical seal; 8. Second front flange; 9. Rear flange; 10. Angular contact ball bearing; 11. Deep groove ball bearing; 12. Tail base; 13. Driver; 14. First cable; 15. Second cable; 16. First O-ring; 17. Second O-ring; 18. Sealing rubber pad; 19. Heat dissipation rib plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0031] refer to Figure 1-Figure 3 This embodiment provides a permanent magnet motor with a built-in driver 13. The permanent magnet motor is a variable frequency permanent magnet motor. The driver 13 is mainly integrated into the motor to form a compact and efficient integrated device.

[0032] The permanent magnet motor includes a stator assembly and a rotor assembly. The stator assembly is composed of a winding core 1 and a liquid-cooled housing 2, and the housing adopts liquid cooling technology to achieve efficient heat dissipation. The rotor assembly is composed of a rotating shaft 3 and an impeller 4, a first mechanical seal 5, a first front flange 6, a second mechanical seal 7, a second front flange 8, and a rear flange 9 arranged on the rotating shaft 3 in sequence. A pair of angular contact ball bearings 10 are arranged between the second front flange 8 and the rotating shaft 3, a deep groove ball bearing 11 and its axial positioning sealing parts are arranged between the rear flange 9 and the rotating shaft 3, and the winding core 1 is arranged between the second front flange 8 and the rear flange 9.

[0033] A tail base 12 is provided at the tail end of the liquid cooling housing 2, and a cavity with a space is provided in the tail base 12, and the cavity is used to place a driver 13 to form a driving module. The driver 13 hardware is fixed in the cavity of the tail base 12, and connected to the winding core 1 through a lead-out cable, and a first cable 14 and a second cable 15 are provided on the outer machine of the permanent magnet motor, and the driver 13 hardware leads out the power source and the control signal through the first cable 14 and the second cable 15 respectively.

[0034] In this embodiment, considering the anti-corrosion requirements of the underwater environment, main components such as the rotating shaft 3, the impeller 4, the tail base 12, the casing and the front and rear flanges 9 are all made of stainless steel.

[0035] The sealing setting of the permanent magnet motor includes a static sealing structure and a dynamic sealing structure. The IP68 protection level of the whole machine is achieved by setting the static sealing structure and the dynamic sealing structure. The motor can be completely dustproof and can be immersed in water indefinitely. At the same time, the driver 13 is installed in the inner cavity space of the tail base 12, and the sealing condition of the motor is used to protect the driver 13 to ensure its safety and reliability. The built-in design of the driver 13 not only solves the difficulty of IP68 protection, but also makes the appearance of the whole machine more beautiful and the structure more compact.

[0036] The static sealing structure is set, and the end face of the liquid cooling housing 2 is used as the joint with the first front flange 6. The sealing is achieved by applying sealant to the end face of the liquid cooling housing 2 and setting a first O-ring 16 between the first front flange 6 and the end face of the liquid cooling housing 2. The sealing is achieved by setting a second O-ring 17 between the second front flange 8 and the inner side wall of the liquid cooling housing 2. The sealing is achieved between the rear flange 9 and the liquid cooling housing 2, and the rear base 12 and the liquid cooling housing 2 by means of a sealant pad 18 and sealant applied to the end face. The first cable 14, the second cable 15 and the rear base 12 are connected to form a seal through a special watertight head on the cable.

[0037] The dynamic seal structure is set by setting the first mechanical seal 5 and the second mechanical seal 7 on the rotating shaft 3 to form a rotating seal of the rotating shaft 3. The first mechanical seal 5 and the second mechanical seal 7 are set between the rotating shaft 3 and the first front flange 6, and between the rotating shaft 3 and the second front flange 8. The first mechanical seal 5 and the second mechanical seal 7 adopt bellows mechanical seals, and the rotating shaft 3 achieves reliable sealing performance through the bellows mechanical seal.

[0038] In this embodiment, a heat dissipation structure is also provided for the built-in driver 13, and a heat dissipation rib plate 19 is provided at the tail end of the tail base 12, and the heat dissipation rib plate 19 is welded on the tail base 12. Installing the heat dissipation rib plate 19 on the tail base 12 is conducive to the heat dissipation of the drive hardware, reducing the construction of the inverter cabinet around the pool, and solving the protection measures and heat dissipation measures of the driver 13 motor integrated machine driver 13.

[0039] The tail base 12 is specially designed with a heat dissipation rib 19 to improve the heat dissipation efficiency and ensure the temperature control of the IGBT module during operation. The driver 13 is directly set inside the motor, which solves the difficulty of IP68 protection of the driver 13, eliminates the project of setting up a frequency converter control cabinet around the working condition, and saves construction costs. The variable frequency permanent magnet submersible motor not only improves efficiency and reliability, but also reduces installation and maintenance costs, improves the convenience of maintenance and long-term operation reliability, reduces the workload of maintenance personnel, and increases the service life of the motor.

[0040] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A permanent magnet motor with a built-in driver, characterized in that: The permanent magnet motor comprises a stator assembly and a rotor assembly; the stator assembly is composed of an iron core with a winding and a liquid cooling housing, and the liquid cooling housing comprises a tail base; the rotor assembly comprises a rotating shaft, a rotor iron core and a front flange; A cavity is provided in the tail base, and the cavity has a space for placing the driver; a cable is provided on the outer machine of the permanent magnet motor for leading out the power source and control signal of the driver; the driver is connected to the winding core through the lead-out cable; A sealing structure is arranged between the front flange and the liquid cooling housing, and between the tail base and the cable; a heat dissipation rib plate is arranged at the tail end of the tail base.

2. The driver-internal permanent magnet motor according to claim 1, characterized in that: The rotor assembly is provided with an impeller, a first front flange, a second front flange and a rear flange in sequence along the rotating shaft; A pair of angular contact ball bearings are arranged between the second front flange and the rotating shaft; and a deep groove ball bearing is arranged between the rear flange and the rotating shaft.

3. The driver-internal permanent magnet motor according to claim 2, characterized in that: The winding core is arranged between the second front flange and the rear flange.

4. The driver-internal permanent magnet motor according to claim 3, characterized in that: A sealing structure is formed between the first front flange and the end surface of the liquid cooling housing by using a sealant and a first O-ring; a sealing structure is formed between the second front flange and the inner side wall of the liquid cooling housing by setting a second O-ring; The rear flange and the tail base are sealed with the liquid cooling casing by using sealant and a sealant pad.

5. The driver-internal permanent magnet motor according to claim 2, characterized in that: The rotating shaft is provided with a first mechanical seal and a second mechanical seal. The first mechanical seal is provided at the front end of the first front flange, and the second mechanical seal is provided at the front end of the second front flange.

6. The driver-internal permanent magnet motor according to claim 5, characterized in that: The first mechanical seal and the second mechanical seal are bellows mechanical seals.

7. The driver-internal permanent magnet motor according to claim 2, characterized in that: The impeller, the first front flange, the second front flange, the rotating shaft, the liquid cooling casing and the tail base are all made of stainless steel.

8. The driver-internal permanent magnet motor according to claim 1, characterized in that: The heat dissipation rib is welded on the tail base.

9. The driver-internal permanent magnet motor according to claim 1, characterized in that: A watertight head is arranged at the end where the cable is connected to the tail base to form a sealing structure.

10. The driver-internal permanent magnet motor according to claim 1, characterized in that: The permanent magnet motor is a variable frequency permanent magnet motor.

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