AC variable frequency motor of wind power yaw system

Abstract

The utility model relates to an AC variable frequency motor of a wind power yaw system, which is structurally characterized in that two ends of a stator assembly are respectively connected with a front end cover assembly part and a rear end cover assembly part, a rotor assembly part is fixed in the front end cover assembly part and the rear end cover assembly part, and two ends of a shaft protrude out of the outer side surfaces of the front end cover assembly part and the rear end cover assembly part; a fan is arranged on a shaft of the rotor assembly part on the outer side of the rear end cover assembly part, a fan cover is arranged on the rear end cover assembly part on the outer side of an air duct fan which is communicated with the outer side and faces the machine base body, and a brake is arranged on the outer side of the fan cover and is connected with one end portion of the shaft of the rotor assembly part. The motor has the advantages that the structural design is reasonable, the motor iron loss can be reduced, and the motor efficiency is improved; the air volume can be increased to realize high-speed or low-speed long-term operation; the optimized mechanical structure facilitates the maintenance and replacement of the brake unit, and also reduces the size of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to an alternating current variable frequency motor, particularly to an alternating current variable frequency motor for a yaw system of a wind turbine generator, and belongs to the technical field of motor structure. BACKGROUND

[0002] With global warming and the increasing scarcity of non-renewable resources such as international crude oil, countries are increasingly attaching importance to the development and utilization of emerging green and environmentally friendly energy. Wind power generation is a kind of energy that can be developed and utilized, and it is valued for its non-polluting and renewable nature. Wind direction is random and always changing. As the key to efficient and stable operation of the entire wind turbine generator, the alternating current speed regulation mode of "wind turbine generator yaw alternating current variable frequency motor + frequency converter" is leading a revolution in the speed regulation field with its outstanding performance and economy, replacing traditional speed regulation methods. It also brings changes to other industries: greatly improving the degree of mechanical automation and production efficiency, increasing the capacity of power supply systems, and miniaturizing equipment, which is rapidly replacing traditional mechanical speed regulation.

[0003] Due to the particularity of variable frequency power supply and the narrow space in the wind turbine generator, the motor as the main power source has stringent requirements, bringing new challenges to the motor in terms of electromagnetic and structural aspects. However, the traditional variable frequency motor in the prior art has problems such as low efficiency, large size, and unsuitable replacement of the braking unit, which cannot effectively meet the above requirements. SUMMARY

[0004] The utility model provides a kind of wind power yaw system alternating current variable frequency motor, its purpose is to overcome the above insufficient of prior art, realize the volume of motor, reduce motor iron loss, improve motor efficiency, improve cooling effect, simplify brake unit maintenance replacement.

[0005] The technical solution of the utility model: a kind of wind power yaw system alternating current variable frequency motor, its structure includes rotor assembly, front end cover assembly, stator assembly, rear end cover assembly, fan, fan cover and brake, wherein the stator assembly is connected with the front end cover assembly and the rear end cover assembly at both ends respectively, the rotor assembly is fixed in the front end cover assembly and the rear end cover assembly and the shaft of the rotor assembly protrudes from the outer side of the front end cover assembly and the rear end cover assembly at both ends, the fan is installed on the shaft of the rotor assembly outside the rear end cover assembly, the fan cover is installed on the rear end cover assembly outside the fan, and the brake is installed outside the fan cover and connected with the shaft of the rotor assembly at one end. When working, the fan can directly cool the rear end cover position of the motor in the rear end cover assembly. The brake unit is more easily disassembled and repaired, the total length of the motor is shortened, and the overall size is smaller.

[0006] Preferably, the rear end cover assembly is provided with an air duct communicated with the outside and facing the machine base body, and the fan cover is sequentially provided with a square cover, an air inlet pad and a brake friction plate.

[0007] Preferably, the punching sheet is made of DW350-50 cold pressing sheet, the core length is 215 mm, and the total length of the motor is 660 mm.

[0008] The utility model has the advantages of reasonable structure design, reduced motor iron loss, improved motor efficiency, increased air volume, realized high-speed or low-speed long-term operation, optimized mechanical structure facilitating maintenance and replacement of the brake unit, and reduced motor size. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is an embodiment structure schematic view of the prior art variable frequency motor.

[0010] Figure 2 is a structure schematic view of the wind power yaw system alternating current variable frequency motor.

[0011] 1 is a rotor assembly, 2 is a front end cover assembly, 3 is a stator assembly, 4 is a rear end cover assembly, 41 is an air duct, 5 is a fan, 6 is a fan cover, 7 is a square cover ring, 8 is an air inlet pad, 9 is a brake friction plate, 10 is a brake,

[0012] 21 is a rotor assembly, 22 is a front end cover assembly, 23 is a stator assembly, 24 is a rear end cover assembly, 25 is a brake assembly, 26 is a fan, and 27 is a fan cover. DETAILED DESCRIPTION

[0013] The utility model will be further described in detail in combination with the embodiments and specific implementation manners.

[0014] As Figure 2As shown, an AC variable frequency motor for a wind power yaw system includes a rotor assembly 1, a front cover assembly 2, a stator assembly 3, a rear cover assembly 4, a fan 5, a fan shroud 6, a grid ring 7, an air inlet pad 8, a brake friction plate 9, and a brake 10. The stator assembly 3 is connected to the front cover assembly 2 and the rear cover assembly 4 at both ends. The rotor assembly 1 is fixed inside the front cover assembly 2 and the rear cover assembly 4, with both ends of the shaft protruding from the outer sides of the front cover assembly 2 and the rear cover assembly 4. A fan 5 is mounted on the shaft of the rotor assembly 1 outside the rear cover assembly 4. A fan shroud 6 is mounted on the rear cover assembly 4 outside the fan 5. The rear cover assembly 4 has an air duct 41 that communicates with the outside and faces the base body. The grid ring 7, the air inlet pad 8, and the brake friction plate 9 are sequentially installed on the outside of the fan shroud 6. The brake 10 is installed on the outside of the brake friction plate 9 and connected to one end of the shaft of the rotor assembly 1.

[0015] Based on the above structure, specifically...

[0016] The installation position and structure of fan 5, fan cover 6, and grid cover 7 enable fan 5 to directly cool the rear end cover of the motor within the rear end cover assembly 4.

[0017] Cooling air can also be drawn out from the air duct 41 on the rear cover assembly 4 to directly cool the body of the base, which increases both the cooling area and the cooling air volume, thereby reducing the motor temperature.

[0018] The installation method of the air inlet pad 8, brake friction plate 9 and brake 10 replaces the direct fixing of the air cover in the existing technology, making the brake unit easier to disassemble and repair, shortening the total length of the motor, making the overall volume smaller, and making it easier to install and maintain.

[0019] The above structure optimizes the mechanical structure, allowing the fan blades and air ducts to directly dissipate heat from the motor, bypassing the brake. This increases the cooling area and airflow, thereby reducing the motor temperature and enabling long-term operation at high or low speeds. Furthermore, the optimized structure reduces the size, and the braking unit is not inside the fan shroud but exposed, facilitating the installation, maintenance, and repair of the yaw AC variable frequency motor of the wind turbine.

[0020] like Figure 1 As shown, the variable frequency motor Y2VPEJS132M-4-7.5 is made of DW800-50 cold-pressed laminations, with a core length of 180mm. It includes a rotor assembly 21, a front cover assembly 22, a stator assembly 23, a rear cover assembly 24, a brake assembly 25, a fan 26, and a fan shroud 27. One end of the stator assembly 23 is connected to the front cover assembly 22, and the other end is connected to the rear cover assembly 24. The rotor assembly 21 is fixed inside the front cover assembly 22 and the rear cover assembly 23. The fan 26 is mounted on the rotor assembly 21, and the fan shroud 27 is mounted on the rear cover assembly 24.

[0021] In actual use, the fan 26 and the mechanism to be cooled are blocked by the brake assembly 25, resulting in poor cooling effect and poor motor cooling effect; the brake assembly 25 is installed in the fan cover 27 and is not easy to disassemble and replace; and the total length of the motor is 710 mm. Embodiment

[0022] The punched sheet is made of DW350-50 cold-pressed sheet, the length of the core is 215 mm, and the total length of the motor is 660 mm.

[0023] The electromagnetic structure is further optimized in the embodiment: the punched sheet cold-pressed sheet is changed from the prior art DW800-50 to DW350-50, the eddy current loss is reduced; the length of the stator core is increased from 180 mm to 215 mm, the magnetic flux density is reduced, the iron loss is reduced, and thus the efficiency is improved.

[0024] The above-described components are all prior art, and a person skilled in the art can use any model and prior design that can realize the corresponding functions.

[0025] The above-described is only a preferred embodiment of the utility model, and it should be noted that, for those skilled in the art, without departing from the creative concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1. An AC variable frequency motor for a wind power yaw system, characterized in that, The assembly includes a rotor assembly (1), a front cover assembly (2), a stator assembly (3), a rear cover assembly (4), a fan (5), a fan shroud (6), and a brake (10). The stator assembly (3) is connected to the front cover assembly (2) and the rear cover assembly (4) at both ends. The rotor assembly (1) is fixed inside the front cover assembly (2) and the rear cover assembly (4), and both ends of the shaft protrude from the outer sides of the front cover assembly (2) and the rear cover assembly (4). The rotor assembly (1) is mounted on the shaft outside the rear cover assembly (4). The fan (5) is equipped with a fan cover (6) on the rear end cover assembly (4) on the outside of the fan (5). The brake (10) is installed on the outside of the fan cover (6) and connected to one end of the shaft of the rotor assembly (1). The rear end cover assembly (4) is provided with an air duct (41) that communicates with the outside and faces the machine base body. The fan cover (6) is installed in sequence with a grid cover (7), an air inlet pad (8) and a brake friction plate (9) on the outside. The laminations are made of DW350-50 cold-pressed sheets with a core length of 215mm and a total motor length of 660mm.

Images