Fan-free wind power yaw system alternating current variable frequency motor

Abstract

A punching sheet of the fan-free wind power yaw system AC variable frequency motor is made of a DW250-50 cold pressing sheet, the structure of the fan-free wind power yaw system AC variable frequency motor does not comprise a fan, a brake is installed on a rotor assembly part on the outer side of a rear end cover assembly part, a transition plate is installed on the rotor assembly part on the outer side of the brake, a rotary transformer is installed on the end portion of the rotor assembly part on the outer side of the brake, and a rotor is installed on the rotor assembly part on the outer side of the brake. The total length of the motor is 615 mm. The utility model has the advantages that the iron loss of the motor can be effectively reduced, and the wind friction consumption of the motor is reduced, thereby improving the efficiency of the motor; the axial and radial optimized sealing structure can improve the protection grade of the motor and prolong the service life of outdoor long-term reliable operation; the overall structural layout is optimized, the size and the weight of the motor are reduced, installation of the alternating-current variable-frequency motor of the wind power yaw system is facilitated, and an operation space for maintenance is provided; the rotary transformer is additionally arranged, so that the precision and the sensitivity of the system are improved, and the stability of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an alternating current variable frequency motor, specifically relates to an alternating current variable frequency motor for yaw system of wind turbine generator set without fan, belongs to motor structure technical field. BACKGROUND

[0002] With global climate warming and the increasingly scarce of international oil and other non-renewable resources, governments of various countries pay more and more attention to the development and utilization of emerging green environmental protection energy. Wind power generation is a kind of energy that can be developed and utilized, and it is paid attention to because of its non-pollution and renewability. Wind direction has randomness and always changes, as the key to efficient and stable operation of the whole wind turbine generator set, the alternating current speed regulation mode of " wind turbine generator set yaw alternating current variable frequency motor + frequency converter" is leading a revolution of replacing traditional speed regulation mode with its excellent performance and economy in the speed regulation field. For various trades and industries, the degree of mechanical automation and production efficiency are greatly improved, and the capacity is correspondingly improved, the equipment is miniaturized, and the traditional mechanical speed regulation is replaced at a very fast speed.

[0003] Due to the particularity of variable frequency power supply and the narrow space in the wind turbine generator set, the motor as the power main body has high requirements and brings new problems in electromagnetic and structure aspects. However, the traditional variable frequency motor in the prior art has problems of low efficiency, large size and low protection level, and cannot effectively meet the above requirements.

[0004] Specifically, the existing variable frequency motor has the following problems: the punching cold pressing sheet is not selected well, resulting in high motor iron loss; a fan needs to be configured, the motor wind friction loss is high, and the motor efficiency is affected; the motor installation layout is not good, resulting in large size and weight of the motor, which is not convenient for installation in the wind turbine generator set; the sealing structure is not good, resulting in insufficient motor protection level and affecting the outdoor service life; there are also problems of insufficient system precision and sensitivity, resulting in insufficient system stability. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of fanless wind power yaw system alternating current variable frequency motor, which aims to overcome the above-mentioned deficiencies in the prior art, improve efficiency, optimize cooling effect, reduce size, improve protection level and improve system stability.

[0006] The utility model discloses a technical solution: a fanless wind power yaw system AC variable frequency motor, its punching sheet is DW250-50 cold pressure sheet, its structure does not include fan, and its structure includes rotor assembly, front end cover assembly, stator assembly, rear end cover assembly, brake and rotary transformer, wherein the stator assembly two ends are connected with front end cover assembly and rear end cover assembly respectively, the rotor assembly is installed in the inside of stator assembly and protrudes from front end cover assembly and rear end cover assembly at both ends, the rotor assembly on the outside of rear end cover assembly is equipped with brake, the rotor assembly on the outside of brake is equipped with transition plate, the end of rotor assembly on the outside of brake is equipped with rotary transformer, the outside of rotary transformer is covered with cover body, and the cover body is fixed on transition plate, the protection cover one end is installed on rear end cover assembly, and the protection cover is covered in the outside of brake, transition plate, cover body whole, and the protection cover other end installs cover plate, and the total length of motor is 615mm. The selection of cold pressure sheet punching sheet is optimized, the total length of motor is reduced through the design of overall layout, and rotary transformer is increased.

[0007] Preferably, the stator assembly and the front end cover assembly are provided with a front O-shaped sealing ring at the connection position, the stator assembly and the rear end cover assembly are provided with a rear O-shaped sealing ring at the connection position, and the protection cover and the rear end cover assembly are provided with an O-shaped sealing ring at the connection position. The radial sealing is increased.

[0008] Preferably, the front end cover assembly and the rotor assembly are provided with a first skeleton oil seal at the connection position, and the transition plate and the rotor assembly are provided with a second skeleton oil seal at the inside. The axial sealing is increased.

[0009] The utility model discloses the advantages: the structure design is reasonable, through the optimization selection of cold pressure sheet punching sheet and the omission of fan, can effectively reduce motor iron loss, reduce the wind friction loss of motor, thereby improve motor efficiency;The axial and radial optimized sealing structure can improve the protection level of motor, prolong the service life of long-term reliable operation outdoors;The optimization of overall structure layout realizes the reduction of the volume and weight of motor, is helpful to the installation of wind power yaw system AC variable frequency motor, provides the operation space of maintenance and repair;The increase of rotary transformer improves the precision and sensitivity of system, thereby improves the stability of system. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is an embodiment structure schematic diagram of prior art variable frequency motor.

[0011] Figure 2 It is the structure schematic diagram of the utility model fanless wind power yaw system AC variable frequency motor.

[0012] In the diagram, 1 is the rotor assembly, 2 is the front cover assembly, 3 is the stator assembly, 4 is the rear cover assembly, 5 is the brake, 6 is the protective cover, 7 is the transition plate, 8 is the rotary transformer, 9 is the housing, 10 is the cover plate, 11 is the first skeleton oil seal, 12 is the front O-ring, 13 is the rear O-ring, 14 is the O-ring, and 15 is the second skeleton oil seal.

[0013] 21 is the rotor assembly, 22 is the front cover assembly, 23 is the stator assembly, 24 is the rear cover assembly, 25 is the brake assembly, 26 is the fan, and 27 is the fan cover. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0015] like Figure 2 As shown, an AC variable frequency motor for a fanless wind power yaw system is disclosed. Its laminations are made of DW250-50 cold-pressed sheets, with a total length of 615mm. The structure includes a rotor assembly 1, a front cover assembly 2, a stator assembly 3, a rear cover assembly 4, a brake 5, and a rotary transformer 8. The stator assembly 3 is connected to the front cover assembly 2 and the rear cover assembly 4 at its two ends, respectively. A front O-ring seal 12 is provided at the connection between the stator assembly 3 and the front cover assembly 2, and a rear O-ring seal 13 is provided at the connection between the stator assembly 3 and the rear cover assembly 4. The rotor assembly 1 is installed inside the stator assembly 3 and protrudes from the front cover assembly 2 and the rear cover assembly 4 at both ends. The front cover assembly... A first skeleton oil seal 11 is provided at the connection between component 2 and rotor assembly 1. A brake 5 is installed on rotor assembly 1 outside the rear end cover assembly 4. A transition plate 7 is installed on rotor assembly 1 outside the brake 5. A second skeleton oil seal 15 is provided between the inner side of the transition plate 7 and rotor assembly 1. A rotary transformer 8 is installed on the end of rotor assembly 1 outside the brake 5. A cover 9 is provided on the outside of the rotary transformer 8. The cover 9 is fixed on the transition plate 7. One end of the protective cover 6 is installed on the rear end cover assembly 4. An O-ring seal 14 is provided at the connection between the protective cover 6 and the rear end cover assembly 4. The protective cover 6 covers the entire outside of the brake 5, transition plate 7, and cover 9. A cover plate 10 is installed on the other end of the protective cover 6.

[0016] The front O-ring 12, rear O-ring 13, and O-ring 14 are provided to increase radial sealing.

[0017] The first and second skeleton oil seals are designed to enhance axial sealing. Comparative Example

[0018] like Figure 1The motor total length is 710mm, the punching sheet is DW800-50 cold pressing sheet, the core length is 180mm, and the motor comprises a rotor assembly 21, a front end cover assembly 22, a stator assembly 23, a rear end cover assembly 24, a brake assembly 25, a fan 26 and a fan cover 27. The stator assembly 23 is connected with the front end cover assembly 22 at one end and connected with the rear end cover assembly 24 at the other end. The rotor assembly 21 is fixed in the front end cover assembly 22 and the rear end cover assembly 23. The fan 26 is arranged on the rotor assembly 21, and the fan cover 27 is arranged on the rear end cover assembly 24.

[0019] Compared with the comparative example,

[0020] 1) The electromagnetic structure is optimized: the punching sheet cold pressing sheet is changed from DW800-50 to DW250-50, so that the eddy current loss can be reduced; the motor fan is removed, so that the wind friction loss of the motor is reduced, and thus the efficiency can be improved.

[0021] 2) The mechanical structure is optimized: the motor total length is shortened from 710mm to 615mm, so that the motor volume is reduced, and the installation and maintenance of the yawing AC variable frequency motor of the wind turbine generator are facilitated; the axial skeleton oil seal is increased, the radial O-ring is increased, the protection grade of the motor is improved, and the long-term reliable operation of the motor in the outdoor environment can be ensured; the rotary transformer is increased, so that the precision and sensitivity of the system are improved, and thus the stability of the system is improved.

[0022] The above-mentioned components are all prior art, and a person skilled in the art can use any model and existing design that can realize the corresponding functions.

[0023] The above-mentioned is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons 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 range of the utility model.

Claims

1. A fanless wind power yaw system AC variable frequency motor, characterized in that, The punch is made of DW250-50 cold pressed sheet, and the structure does not include a fan, and the structure includes a rotor assembly (1), a front end cover assembly (2), a stator assembly (3), a rear end cover assembly (4), a brake (5) and a rotary transformer (8), wherein the stator assembly (3) is connected to the front end cover assembly (2) and the rear end cover assembly (4) at both ends, respectively, the rotor assembly (1) is installed inside the stator assembly (3) and protrudes from the front end cover assembly (2) and the rear end cover assembly (4) at both ends, the rotor assembly (1) outside the rear end cover assembly (4) is provided with the brake (5), the rotor assembly (1) outside the brake (5) is provided with a transition plate (7), the rotor assembly (1) outside the brake (5) is provided with the rotary transformer (8) at the end, the rotary transformer (8) is covered with a cover (9) outside, the cover (9) is fixed on the transition plate (7), a protective cover (6) is installed on the rear end cover assembly (4) at one end, the protective cover (6) covers the brake (5), the transition plate (7) and the cover (9) outside, and the other end of the protective cover (6) is installed with a cover plate (10), and the total length of the motor is 615mm.

2. A fanless wind power yaw system AC variable frequency motor as claimed in claim 1, characterized in that, The stator assembly (3) is provided with a front O-shaped sealing ring (12) at the connection with the front end cover assembly (2), the stator assembly (3) is provided with a rear O-shaped sealing ring (13) at the connection with the rear end cover assembly (4), and the protective cover (6) is provided with an O-shaped sealing ring (14) at the connection with the rear end cover assembly (4).

3. A fanless wind power yaw system AC variable frequency motor as claimed in claim 1, characterized in that, The front end cover assembly (2) is provided with a first skeleton oil seal (11) at the connection with the rotor assembly (1), and a second skeleton oil seal (15) is arranged between the inside of the transition plate (7) and the rotor assembly (1).

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