High-torque-density variable-pitch alternating-current permanent magnet synchronous motor for wind power

Abstract

The utility model relates to a high torque density variable pitch alternating current permanent magnet synchronous motor for wind power, which comprises a front end cover, a rear end cover, a front shell, a front bearing, a rear bearing, an output shaft, a motor stator and a motor rotor, the output shaft sequentially penetrates through the front end cover, the front bearing, the motor rotor, the rear bearing and the rear end cover from front to back, the front end cover, the front shell and the rear end cover jointly define an installation cavity, and the motor stator and the motor rotor are fixedly installed in the installation cavity. The output shaft is fixedly connected with the front bearing and the rear bearing; the output shaft and the motor rotor are fixedly installed together, the motor rotor and the motor stator are oppositely arranged but not in contact, a stator winding is arranged in the motor stator, magnetic steel is embedded in the motor rotor, and the magnetic steel is made of high-remanence high-temperature-resistant neodymium iron boron magnetic steel.

Description

Technical Field

[0001] The utility model belongs to the field of motors, and in particular relates to a high torque density variable pitch AC permanent magnet synchronous motor for wind power. Background Art

[0002] Currently, there are several types of variable pitch motors for wind power, such as DC motors and induction motors. These types of motors are generally equipped with cooling fans at the rear. The cooling fans make the overall size and weight of the motor larger. The cooling fans cannot be sealed or have poor sealing, resulting in a low protection level and inconvenient use and maintenance. Summary of the invention

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a high torque density variable pitch AC permanent magnet synchronous motor for wind power.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high torque density variable pitch AC permanent magnet synchronous motor for wind power, comprising a front end cover, a rear end cover, a front housing, a front bearing, a rear bearing, an output shaft, a motor stator and a motor rotor, the two ends of the front housing are respectively fixedly connected to the front end cover and the rear end cover, the output shaft passes through the front end cover, the front bearing, the motor rotor, the rear bearing and the rear end cover in sequence from front to back, the front end cover, the front housing and the rear end cover together enclose an installation cavity, the motor stator and the motor rotor are fixedly installed in the installation cavity; the output shaft and the front bearing and the rear bearing are fixedly connected together; the output shaft and the motor rotor are fixedly installed together, the motor rotor and the motor stator are arranged relative to each other but not in contact, the motor stator has a stator winding, the motor rotor is embedded with magnetic steel, and the material of the magnetic steel is high remanence and high temperature resistant neodymium iron boron magnetic steel.

[0005] In one embodiment of the present application, a front bearing mounting cavity is provided on the front end cover, and the front bearing is fixedly installed in the front bearing mounting cavity by means of clearance fit; a rear bearing mounting cavity is provided on the rear end cover, and the rear bearing is fixedly installed in the rear bearing mounting cavity by means of clearance fit.

[0006] In one embodiment of the present application, it also includes a brake and an encoder assembly, wherein the brake is fixedly connected to the rear end cover by means of screw connection, wherein the brake and the rear bearing are respectively located on two opposite sides of the rear end cover; the encoder assembly includes an encoder base, an encoder stator and an encoder rotor, wherein the encoder base is fixedly connected to the brake by means of screw connection, and the encoder stator is fixedly connected to the encoder base by means of screw connection, and the encoder stator has an installation channel that passes through the axial direction, and the encoder rotor is fixedly connected to the output shaft on the one hand, and is installed in the installation channel of the encoder stator on the other hand; the encoder rotor rotates in the installation channel of the encoder stator relative to the encoder stator, and the encoder rotor does not contact the inner wall of the installation channel of the encoder stator; the encoder rotor and the output shaft are fixedly connected together by a first screw.

[0007] In one embodiment of the present application, it also includes a rear shell and a cover, the rear shell and the rear end cover are fixed together by screw connection, the cover covers the rear shell, and the cover and the rear shell are fixed together by screw connection; the rear end cover, the rear shell and the cover together enclose a chamber, and the brake and the encoder assembly are placed in the chamber.

[0008] In one embodiment of the present application, a wave spring washer is placed in the rear bearing mounting cavity. The wave spring washer abuts against the rear bearing mounting cavity on one hand and against the rear bearing on the other hand. The wave spring washer is located between the rear bearing and the rear bearing mounting cavity.

[0009] In one embodiment of the present application, it also includes an oil seal and a second screw, wherein the oil seal is sleeved on the output shaft and is close to the front bearing; the front bearing is fixedly mounted on the front end cover by the second screw.

[0010] In one embodiment of the present application, it also includes a power socket and a signal socket, the power socket is electrically connected to the stator winding of the motor stator, and the signal socket is electrically connected to the brake and the encoder assembly.

[0011] In one embodiment of the present application, a sealing ring is further included, and the sealing ring is provided at the connection between the front end cover and the front shell; the sealing ring is provided at the connection between the rear end cover and the front shell; the sealing ring is provided at the connection between the rear end cover and the rear shell; the sealing ring is provided at the connection between the cover and the rear shell, so as to ensure good sealing of the entire motor.

[0012] In one embodiment of the present application, the front end cover and the rear end cover are made of ductile iron; the front housing and the rear housing are made of aluminum alloy; the brake is made of low-temperature material; the encoder adopts a stator-rotor separation type rotary transformer; the front bearing and the rear bearing adopt wide temperature range sealed bearings, and the temperature range is -40°C to 130°C.

[0013] The beneficial effects of the present application are as follows: the high torque density variable pitch AC permanent magnet synchronous motor for wind power provided by the present application is small in size, light in weight, good in sealing, high in protection level, and easy to use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a structural schematic diagram of a high torque density variable pitch AC permanent magnet synchronous motor for wind power.

[0015] Figure 2 for Figure 1 A partial enlarged view of .

[0016] Figure 3 for Figure 1 Another partial enlargement of .

[0017] Figure 4 for Figure 1 Another partial enlargement of . DETAILED DESCRIPTION

[0018] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0019] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations, and the operation steps involved in each embodiment can also be replaced or adjusted in a sequence in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a certain embodiment and do not mean that the composition and / or sequence are necessary.

[0020] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0021] Please refer to Figure 1-4 The present application provides a high torque density variable pitch AC permanent magnet synchronous motor for wind power, the motor comprising a front cover 1, a rear cover 2, a front housing 8, a front bearing 6, a rear bearing 7, an output shaft 3, a motor stator 4 and a motor rotor 5, the two ends of the front housing 8 are respectively fixedly connected to the front cover 1 and the rear cover 2, the output shaft 2 passes through the front cover 1, the front bearing 6, the motor rotor 5, the rear bearing 7 and the rear cover 2 in sequence from front to back, the front cover 1, the front housing 8 and the rear cover 2 Together they enclose a mounting cavity 80, in which the motor stator 4 and the motor rotor 5 are fixedly mounted; the output shaft 3 and the front bearing 6 and the rear bearing 7 are fixedly connected (such as conventional interference fit); the output shaft 3 and the motor rotor 5 are fixedly mounted together, the motor rotor 5 and the motor stator are arranged relative to each other but not in contact, the motor stator 4 has a stator winding 41, and the motor rotor 5 is embedded with a magnetic steel 51, and the material of the magnetic steel 51 is a high remanence and high temperature resistant neodymium iron boron magnetic steel. This ensures that the motor torque pulsation is low and the magnetic resistance torque is fully utilized, reducing the motor load current and temperature rise, and the efficiency is high, so the motor can reduce the volume and weight and achieve high torque density.

[0022] In one embodiment of the present application, the magnetic steel 51 is embedded in the motor rotor 5 in a straight line shape; the winding method of the stator winding 41 is distributed winding.

[0023] In one embodiment of the present application, a front bearing mounting cavity (not indicated by a number in the figure) is provided on the front end cover 1, and the front bearing 6 is fixedly installed in the front bearing mounting cavity by means of a clearance fit; a rear bearing mounting cavity 20 is provided on the rear end cover 2, and the rear bearing 7 is fixedly installed in the rear bearing mounting cavity by means of a clearance fit.

[0024] In one embodiment of the present application, the motor further includes a brake 12, which is fixedly connected to the rear end cover 2 by means of screw connection, wherein the brake 12 and the rear bearing 7 are respectively located on two opposite sides of the rear end cover 2.

[0025] In one embodiment of the present application, the motor further includes an encoder assembly, which includes an encoder base 13, an encoder stator 14 and an encoder rotor 15. The encoder base 13 is fixedly connected to the brake 12 by means of screw connection, and the encoder stator 14 is fixedly connected to the encoder base 13 by means of screw connection. The encoder stator 14 has a mounting channel 140 that passes through the axial direction. The encoder rotor 15 is fixedly connected to the output shaft 3 on the one hand, and is mounted in the mounting channel 140 of the encoder stator 14 on the other hand; the encoder rotor 15 rotates in the mounting channel 140 of the encoder stator 14 relative to the encoder stator 14, and the encoder rotor 15 does not contact the inner wall of the mounting channel 140 of the encoder stator 14.

[0026] In one embodiment of the present application, the encoder rotor 15 and the output shaft 3 are fixedly connected together by a first screw 16 .

[0027] In one embodiment of the present application, the motor further includes a rear housing 9 and a cover 11, wherein the rear housing 9 and the rear end cover 2 are fixed together by means of screw connections, the cover 11 covers the rear housing 9, and the cover 11 and the rear housing 9 are fixed together by means of screw connections; the rear end cover 2, the rear housing 9 and the cover 11 together enclose a chamber 10, and the brake 12 and the encoder assembly are placed in the chamber 10.

[0028] In one embodiment of the present application, a wave spring washer 17 is placed in the rear bearing mounting cavity 20. The wave spring washer 17 abuts against the rear bearing mounting cavity 20 on one hand and against the rear bearing 7 on the other hand. The wave spring washer 17 is located between the rear bearing 7 and the rear bearing mounting cavity 20.

[0029] In one embodiment of the present application, the motor further includes an oil seal 21 , which is sleeved on the output shaft 3 , and the oil seal 21 is close to the front bearing 6 .

[0030] In one embodiment of the present application, the motor further includes a second screw 18, and the front bearing 6 is fixedly mounted on the front end cover 1 by the second screw 18. Although the front bearing 6 is fixedly mounted in the front bearing mounting cavity of the front end cover 1 by interference fit, the second screw 18 makes the fixed mounting between the front bearing 6 and the front end cover 1 more secure.

[0031] In one embodiment of the present application, the motor further includes a power socket 22 and a signal socket 23, wherein the power socket 22 is electrically connected to the stator winding 41 of the motor stator 4, and the signal socket 23 is electrically connected to the brake 12 and the encoder assembly. In this way, the stator winding 41 is powered by the power socket 22, and the stator winding 41 generates a magnetic field, which then drives the motor rotor 5 to rotate, thereby driving the output shaft 3 to rotate; the signal socket 23 is an adapter, which is connected to the PLC controller on one hand, and to the brake 12 and the encoder assembly on the other hand, and the information collected by the brake 12 and the encoder assembly is uploaded to the PLC controller through the signal socket 23, and the PLC controller also transmits control instructions to the brake 12 and the encoder assembly through the signal socket 23.

[0032] In one embodiment of the present application, the motor further includes a sealing ring 19, wherein the sealing ring 19 is disposed at the connection between the front end cover 1 and the front shell 8; the sealing ring 19 is disposed at the connection between the rear end cover 2 and the front shell 8; the sealing ring 19 is disposed at the connection between the rear end cover 2 and the rear shell 9; and the sealing ring 19 is disposed at the connection between the cover 14 and the rear shell 9, thereby ensuring good sealing of the entire motor.

[0033] In one embodiment of the present application, the front cover 1 and the rear cover 2 are made of ductile iron; the front housing and the rear housing are made of aluminum alloy; the brake is made of low-temperature material; the encoder adopts a stator-rotor separation type rotary transformer; the front bearing and the rear bearing adopt a wide temperature range sealed bearing, the temperature range is -40℃~130℃. In this way, the ductile iron material can withstand high impact vibration and low temperature impact; the aluminum alloy material is light in weight, high in strength, good in thermal conductivity, and low in cost; the low-temperature material can still ensure the braking torque at minus 40 degrees Celsius, and has a high protection level; the encoder adopts a stator-rotor separation type rotary transformer, which has a simple structure, sensitive action, reliable operation, low requirements on environmental conditions (especially high temperature and high dust places), large output signal amplitude and strong anti-interference ability; the front and rear bearings adopt a wide temperature range sealed bearing, the use temperature is between -40 degrees Celsius and 130 degrees Celsius, and maintenance-free.

[0034] The high torque density variable pitch AC permanent magnet synchronous motor for wind power provided in the present application has small size, light weight, good sealing, high protection level, and is easy to use and maintain.

[0035] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A high torque density variable pitch AC permanent magnet synchronous motor for wind power, characterized in that: It includes a front end cover, a rear end cover, a front housing, a front bearing, a rear bearing, an output shaft, a motor stator and a motor rotor, the two ends of the front housing are fixedly connected to the front end cover and the rear end cover respectively, the output shaft passes through the front end cover, the front bearing, the motor rotor, the rear bearing and the rear end cover in sequence from front to back, the front end cover, the front housing and the rear end cover together enclose an installation cavity, the motor stator and the motor rotor are fixedly installed in the installation cavity; the output shaft and the front bearing and the rear bearing are fixedly connected together; the output shaft and the motor rotor are fixedly installed together, the motor rotor and the motor stator are arranged opposite to each other but not in contact, the motor stator has a stator winding, the motor rotor is embedded with magnetic steel, and the material of the magnetic steel is high remanence and high temperature resistant neodymium iron boron magnetic steel.

2. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 1, characterized in that: The front end cover is provided with a front bearing installation cavity, and the front bearing is fixedly installed in the front bearing installation cavity by means of clearance fit; the rear end cover is provided with a rear bearing installation cavity, and the rear bearing is fixedly installed in the rear bearing installation cavity by means of clearance fit.

3. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 1, characterized in that: It also includes a brake and an encoder assembly, wherein the brake is fixedly connected to the rear end cover by means of screw connection, wherein the brake and the rear bearing are respectively located on two opposite sides of the rear end cover; the encoder assembly includes an encoder base, an encoder stator and an encoder rotor, wherein the encoder base is fixedly connected to the brake by means of screw connection, and the encoder stator is fixedly connected to the encoder base by means of screw connection, and the encoder stator has an installation channel that passes through along the axial direction, wherein the encoder rotor is fixedly connected to the output shaft on the one hand, and is installed in the installation channel of the encoder stator on the other hand; the encoder rotor rotates in the installation channel of the encoder stator relative to the encoder stator, and the encoder rotor does not contact the inner wall of the installation channel of the encoder stator; the encoder rotor and the output shaft are fixedly connected together by a first screw.

4. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 3, characterized in that: It also includes a rear shell and a cover, wherein the rear shell and the rear end cover are fixed together by screw connection, the cover covers the rear shell, and the cover and the rear shell are fixed together by screw connection; the rear end cover, the rear shell and the cover together enclose a chamber, and the brake and the encoder assembly are placed in the chamber.

5. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 2, characterized in that: A wave spring washer is placed in the rear bearing installation cavity. The wave spring washer abuts against the rear bearing installation cavity on one hand and the rear bearing on the other hand. The wave spring washer is located between the rear bearing and the rear bearing installation cavity.

6. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 4, characterized in that: It also includes an oil seal and a second screw. The oil seal is sleeved on the output shaft and is close to the front bearing. The front bearing is fixedly mounted on the front end cover by the second screw.

7. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 6, characterized in that: It also includes a power socket and a signal socket, wherein the power socket is electrically connected to the stator winding of the motor stator, and the signal socket is electrically connected to the brake and the encoder assembly.

8. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 7, characterized in that: It also includes a sealing ring, which is provided at the connection between the front end cover and the front shell; the sealing ring is provided at the connection between the rear end cover and the front shell; the sealing ring is provided at the connection between the rear end cover and the rear shell; and the sealing ring is provided at the connection between the cover and the rear shell, so as to ensure good sealing of the entire motor.

9. The high torque density variable pitch AC permanent magnet synchronous motor for wind power according to claim 7, characterized in that: The front end cover and the rear end cover are made of ductile iron; the front housing and the rear housing are made of aluminum alloy; the brake is made of low-temperature material; the encoder adopts a stator-rotor separation type rotary transformer; the front bearing and the rear bearing adopt wide temperature range sealed bearings, and the temperature range is -40℃ to 130℃.

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