Fractional slot concentrated winding variable pitch alternating current permanent magnet synchronous motor for wind power

Abstract

The utility model relates to a fractional slot concentrated winding variable pitch alternating current permanent magnet synchronous motor for wind power, which comprises a rotating shaft, a front end cover, a first bearing, a stator core, a stator winding, a rotor, a second bearing, a rear end cover and magnetic steel, the first bearing is fixedly connected with the front end area of the rotating shaft; the rear end cover and the rear end area of the rotating shaft are fixedly installed together, and the second bearing and the rear end area of the rotating shaft are fixedly connected. The rotating shaft, the front end cover and the rear end cover define a cavity, and the stator iron core and the rotor are fixedly installed in the cavity; the stator core is provided with stator teeth, the stator winding comprises a preset number of stator coils, and each stator coil is wound on one stator tooth of the stator core.

Description

Technical Field

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

[0002] At present, variable pitch permanent magnet motors for wind power usually use dispersed embedded distributed windings, which have large pitches, long winding ends, large copper usage, and difficulty in heat dissipation at the ends; the windings are insulated with varnish, and the thermal conductivity of the insulating varnish is low, usually between 0.1-0.3W / m·K. This makes the motors inefficient, large in overall size and weight, and inconvenient to use and maintain. Summary of the invention

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a fractional slot concentrated winding 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 fractional-slot concentrated winding variable-pitch AC permanent magnet synchronous motor for wind power, comprising a rotating shaft, a front end cover, a first bearing, a stator core, a stator winding, a rotor, a second bearing, a rear end cover and a magnetic steel, the rotating shaft having a front end head and a rear end head, the front end cover and the front end area of ​​the rotating shaft are fixedly installed together, the first bearing and the front end area of ​​the rotating shaft are fixedly connected; the rear end cover and the rear end area of ​​the rotating shaft are fixedly installed together, and the second bearing and the rear end area of ​​the rotating shaft are fixedly connected; the rotating shaft, the front end cover and the rear end cover enclose a chamber, the stator core and the rotor are fixedly installed in the chamber; stator teeth are arranged on the stator core, the stator winding comprises a preset number of stator coils, each of the stator coils is wound around a stator tooth of the stator core; the magnetic steel is embedded in the rotor.

[0005] Optimally, the stator winding is potted with insulating resin so that the stator winding is potted as a whole; the thermal conductivity of the insulating resin is 2-3.5w / m·k, the rotor and the rotating shaft are fixedly connected together, and the stator core and the rotor are arranged opposite to each other but not in contact.

[0006] Furthermore, it also includes a front casing, the two ends of which are fixedly installed with the front end cover and the rear end cover respectively, a sealing ring is arranged between the front casing and the front end cover, and a sealing ring is arranged between the front casing and the rear end cover, so that the sealing performance of the motor is better; the stator core is fixedly connected to the front casing, and the stator core and the front casing are fixedly connected together by interference fit.

[0007] Furthermore, it also includes a brake, which is fixedly mounted on the rear end cover and is close to the rear end area of ​​the rotating shaft; it also includes an encoder and an encoder base, the encoder includes an encoder stator and an encoder rotor, the encoder base is fixedly connected to the brake, the encoder stator is fixedly connected to the encoder base, and the encoder rotor is fixedly connected to the rear end head of the rotating shaft; the encoder stator has a rotating channel that passes through the axial direction, the encoder rotor is sleeved in the rotating channel, and the encoder rotor does not contact the inner wall of the rotating channel.

[0008] In one embodiment of the present application, it also includes a shoulder sleeve, which is fixedly mounted on the front end area of ​​the rotating shaft, and the front end cover is mounted on the shoulder sleeve; it also includes an oil seal, which is mounted on the shoulder sleeve, and the oil seal is close to the first bearing.

[0009] In one embodiment of the present application, it also includes a power aviation socket and a signal aviation socket, the power aviation socket is fixedly mounted on the front housing, and the power aviation socket is electrically connected to the stator winding; the signal aviation socket is fixedly mounted on the rear housing, and the signal aviation socket is electrically connected to the encoder.

[0010] In one embodiment of the present application, the second bearing is fixedly mounted on the rear end cover, and a wave spring washer is installed between the second bearing and the rear end cover.

[0011] In one embodiment of the present application, the rear end cover is provided with a second bearing mounting chamber, and the second bearing is fixedly mounted in the second bearing mounting chamber in a clearance fit connection manner, and the wave spring washer abuts against the inner wall of the second bearing mounting chamber on the one hand, and against the second bearing on the other hand.

[0012] In one embodiment of the present application, the front end cover and the front housing are fixedly mounted together by means of screw connection, and the rear end cover and the rear housing are fixedly mounted together by means of screw connection; the motor also includes a rear cover plate, which is fixedly connected to the rear housing by means of screw connection.

[0013] In one embodiment of the present application, the front end cover and the rear end cover are made of ductile iron material, the front housing and the rear housing are made of aluminum alloy material, the brake is made of low-temperature material, the encoder is a stator-rotor separation type rotary transformer, and the first bearing and the second bearing are wide temperature range sealed bearings with an operating temperature of -40°C to 130°C.

[0014] The beneficial effects of the present application are as follows: the fractional-slot concentrated winding variable-pitch AC permanent magnet synchronous motor for wind power provided by the present application has low temperature rise, high efficiency, can reduce volume, weight and cost, while improving the insulation strength and mechanical strength of the stator winding, is more suitable for the harsh operating environment of the variable-pitch motor, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model provides a structural schematic diagram of a fractional-slot concentrated winding variable-pitch AC permanent magnet synchronous motor for wind power.

[0016] Figure 2 for Figure 1 A partial enlarged view of .

[0017] Figure 3 for Figure 1 Another partial enlargement of .

[0018] Figure 4 for Figure 1 Another partial enlargement of . DETAILED DESCRIPTION

[0019] 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.

[0020] 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 order 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 order are necessary.

[0021] The serial numbers assigned to the components herein, 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 include direct and indirect connections (couplings) unless otherwise specified.

[0022] Please refer to Figure 1-4The present application provides a fractional slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power, the motor comprising a rotating shaft 1, a front end cover 3, a first bearing 2, a stator core 4, a stator winding 5, a rotor 6, a second bearing 10, and a rear end cover 9, the rotating shaft 1 having a front end head 111 and a rear end head 112, the front end cover 3 and the front end area of ​​the rotating shaft 1 are fixedly mounted together, the first bearing 2 and the front end area of ​​the rotating shaft 1 are fixedly connected (such as by a conventional interference fit); the rear end cover 9 and the rear end area of ​​the rotating shaft 1 are fixedly mounted together, the second shaft The bearing 10 is fixedly connected to the rear end area of ​​the rotating shaft 1 (such as by conventional interference fit); the rotating shaft 1, the front end cover 3 and the rear end cover 9 enclose a chamber, and the stator core 4 and the rotor 6 are fixedly installed in the chamber; the stator core 4 is provided with stator teeth (not shown in the figure), and the stator winding 5 adopts a concentrated winding method with a pitch of 1, and the stator winding 5 includes a preset number of stator coils, each of which is wound on a stator tooth of the stator core 4; and also includes a magnetic steel 61, which is embedded in the rotor 6. In this way, the length of the stator winding 5 is shortened, especially the length of the winding end can be shortened by 50%-60%, the resistance of the stator winding 5 is reduced, and thus the heat generation of the stator winding 5 is reduced.

[0023] In one embodiment of the present application, the stator winding 5 is potted with an insulating resin 7, so that the stator winding 5 is potted as a whole; the high thermal conductivity of the insulating resin 7 is 2-3.5W / m·k, so that the heat dissipation capacity of the stator winding 5, especially the winding end, is greatly enhanced, thereby reducing the temperature rise, high efficiency, reducing the volume and weight, and improving the insulation strength and mechanical strength of the stator winding.

[0024] In one embodiment of the present application, the rotor 6 is fixedly connected to the rotating shaft 1, and the stator core 4 and the rotor 6 are arranged relative to each other but not in contact. In this way, the rotor 6 rotates, thereby driving the rotating shaft 1 to rotate. The rotor 6 and the rotating shaft 1 are fixedly connected together, for example, they can be fixed together by an interference fit connection.

[0025] In one embodiment of the present application, the motor also includes a front housing 20, and the two ends of the front housing 20 are respectively fixedly installed with the front end cover 3 and the rear end cover 9, a sealing ring is arranged between the front housing 20 and the front end cover 3, and a sealing ring is arranged between the front housing 20 and the rear end cover 9, so that the sealing performance of the motor is better; the stator core 4 is fixedly connected to the front housing 20, and the stator core 4 and the front housing 20 are fixedly connected together, for example, they can be fixedly connected together by interference fit.

[0026] In one embodiment of the present application, the motor further includes a brake 13, which is fixedly mounted on the rear end cover 9 and is close to the rear end area of ​​the rotating shaft 1; the brake 13 and the rear end cover 9 are fixed together by bolt connection.

[0027] In one embodiment of the present application, the motor further includes an encoder and an encoder base 14, the encoder includes an encoder stator 151 and an encoder rotor 152, the encoder base 14 is fixedly connected to the brake 13, the encoder stator 151 is fixedly connected to the encoder base 14, and the encoder rotor 152 is fixedly connected to the rear end head 112 of the rotating shaft 1; the encoder stator 151 has a rotating channel 1510 that penetrates along the axial direction, the encoder rotor 152 is sleeved in the rotating channel 1510, and the encoder rotor 152 does not contact the inner wall of the rotating channel 1510. In this way, the rotating shaft 1 drives the encoder rotor 152 to rotate in the rotating channel 1510 while rotating, the encoder base 14 is fixedly connected to the brake 13 by screw connection, the encoder stator 151 is fixedly connected to the encoder base 14 by screw connection, and the encoder rotor 152 is fixedly connected to the rear end head 112 of the rotating shaft 1 by screws 17.

[0028] In one embodiment of the present application, the motor further includes a shoulder sleeve 18 , wherein the shoulder sleeve 18 is fixedly sleeved on the front end area of ​​the rotating shaft 1 , and the front end cover 3 is sleeved on the shoulder sleeve 18 .

[0029] In one embodiment of the present application, the motor further includes an oil seal 17 , and the oil seal 17 is sleeved on the shaft shoulder sleeve 18 , and the oil seal 17 is close to the first bearing 2 .

[0030] In one embodiment of the present application, the motor also includes a power aviation socket 8 and a signal aviation socket 12, the power aviation socket 8 is fixedly mounted on the front housing 20, and the power aviation socket 8 is electrically connected to the stator winding 5; the signal aviation socket 8 is fixedly mounted on the rear housing 11, and the signal aviation socket 8 is electrically connected to the encoder.

[0031] In one embodiment of the present application, the second bearing 10 is fixedly mounted on the rear end cover 9 , and a wave spring washer 21 is installed between the second bearing 10 and the rear end cover 9 .

[0032] Specifically, the rear end cover 9 has a second bearing mounting chamber 90, and the second bearing 10 is fixedly mounted in the second bearing mounting chamber 90 in a clearance fit connection manner, and the wave spring washer 21 abuts against the inner wall of the second bearing mounting chamber 90 on the one hand, and abuts against the second bearing 10 on the other hand.

[0033] In one embodiment of the present application, the front cover 3 and the front housing 20 are fixedly installed together by means of screw connection, and the rear cover 9 and the rear housing 11 are fixedly installed together by means of screw connection; the motor also includes a rear cover plate 16, and the rear cover plate 16 is fixedly connected to the rear housing 11 by means of screw connection.

[0034] In one embodiment of the present application, the front cover 3 and the rear cover 9 are made of ductile iron, the front housing 20 and the rear housing 11 are made of aluminum alloy, the brake 13 is made of low-temperature material, the encoder is a stator-rotor separation type rotary transformer, the first bearing and the second bearing are wide temperature range sealed bearings, and the use temperature is -40℃~130℃. Ductile iron material can withstand high impact vibration and low temperature impact; aluminum alloy material is light in weight, high in strength, good in thermal conductivity, and low in cost; stator-rotor separation type rotary transformer has simple structure, sensitive action, reliable operation, low requirements on environmental conditions (especially in high temperature and high dust places), large output signal amplitude and strong anti-interference ability.

[0035] The fractional-slot concentrated winding variable-pitch AC permanent magnet synchronous motor for wind power provided in the present application has low temperature rise, high efficiency, and can reduce volume, weight and cost, while improving the insulation strength and mechanical strength of the stator winding, making it more suitable for the harsh operating environment of the variable-pitch motor and having high reliability.

[0036] 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 fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power, characterized in that: The invention comprises a rotating shaft, a front end cover, a first bearing, a stator core, a stator winding, a rotor, a second bearing, a rear end cover and a magnetic steel, wherein the rotating shaft has a front end head and a rear end head, the front end cover and the front end area of ​​the rotating shaft are fixedly mounted together, the first bearing and the front end area of ​​the rotating shaft are fixedly connected; the rear end cover and the rear end area of ​​the rotating shaft are fixedly mounted together, and the second bearing and the rear end area of ​​the rotating shaft are fixedly connected; the rotating shaft, the front end cover and the rear end cover enclose a chamber, the stator core and the rotor are fixedly mounted in the chamber; stator teeth are arranged on the stator core, the stator winding comprises a preset number of stator coils, each of the stator coils is wound around a stator tooth of the stator core; the magnetic steel is embedded in the rotor.

2. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 1, characterized in that: The stator winding is potted with insulating resin so that the stator winding is potted as a whole; the thermal conductivity of the insulating resin is 2-3.5w / m·k, the rotor and the rotating shaft are fixedly connected together, and the stator core and the rotor are arranged opposite to each other but not in contact.

3. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 2, characterized in that: It also includes a front casing, the two ends of which are fixedly installed with the front end cover and the rear end cover respectively, a sealing ring is arranged between the front casing and the front end cover, and a sealing ring is arranged between the front casing and the rear end cover, so that the sealing performance of the motor is better; the stator core is fixedly connected to the front casing, and the stator core and the front casing are fixedly connected together by interference fit.

4. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 3, characterized in that: It also includes a brake, which is fixedly mounted on the rear end cover and is close to the rear end area of ​​the rotating shaft; it also includes an encoder and an encoder base, the encoder includes an encoder stator and an encoder rotor, the encoder base is fixedly connected to the brake, the encoder stator is fixedly connected to the encoder base, and the encoder rotor is fixedly connected to the rear end head of the rotating shaft; the encoder stator has a rotating channel that passes through the axial direction, the encoder rotor is sleeved in the rotating channel, and the encoder rotor does not contact the inner wall of the rotating channel.

5. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 4, characterized in that: It also includes a shoulder sleeve, which is fixedly mounted on the front end area of ​​the rotating shaft, and the front end cover is mounted on the shoulder sleeve; it also includes an oil seal, which is mounted on the shoulder sleeve and is close to the first bearing.

6. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 5, characterized in that: It also includes a power aviation socket and a signal aviation socket, wherein the power aviation socket is fixedly mounted on the front housing and is electrically connected to the stator winding; the signal aviation socket is fixedly mounted on the rear housing and is electrically connected to the encoder.

7. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 6, characterized in that: The second bearing is fixedly mounted on the rear end cover, and a wave spring washer is installed between the second bearing and the rear end cover.

8. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 7, characterized in that: The rear end cover is provided with a second bearing installation chamber, and the second bearing is fixedly installed in the second bearing installation chamber in a clearance fit connection manner. The wave spring washer abuts against the inner wall of the second bearing installation chamber on one hand, and against the second bearing on the other hand.

9. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 8, characterized in that: The front end cover and the front housing are fixedly mounted together by screw connection, and the rear end cover and the rear housing are fixedly mounted together by screw connection; the motor also includes a rear cover plate, which is fixedly connected to the rear housing by screw connection.

10. The fractional-slot concentrated winding variable pitch AC permanent magnet synchronous motor for wind power according to claim 9, 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 is a stator-rotor separation type rotary transformer, the first bearing and the second bearing are wide temperature range sealed bearings, and the operating temperature is -40°C to 130°C.

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