CN116015000A - Manufacturing process of rare earth cerium magnet motor stator and rotor of small and medium-sized wind driven generator - Google Patents

Abstract

The invention discloses a manufacturing process of a rare earth cerium magnet motor stator and rotor of a small and medium-sized wind driven generator, which is characterized in that the rare earth cerium magnet is firstly applied to manufacture the generator, and then the three processes of processing a generator rotor assembly, processing a stator assembly and assembling the motor are performed. Because the rare earth cerium magnet material adopts a double main phase process, the anti-magnetization performance of the magnet is changed, and the service life of the motor is prolonged; in the aspect of motor design, the novel manufacturing process is comprehensively and optimally designed and formulated according to the characteristics of the cerium magnet, and a novel motor structure is adopted, so that the operation reliability of the motor is improved, and the starting torque is reduced. The stator fractional slot and chute structure is adopted, so that the magnetic resistance is obviously reduced, and the starting resistance moment of the motor and the starting wind speed of the wind driven generator are greatly reduced; the dovetail slot rotor technology is adopted to firmly inlay the permanent magnet, so that the overspeed performance and reliability of the motor are improved. Experiments prove that by applying the rare earth cerium magnet material and improving the manufacturing process, the average power of the motor is increased by 140W and the average efficiency is increased by 3.6% by taking 1000W as an example at the same rotating speed of the motor.

Description

Manufacturing process of rare earth cerium magnet motor stator and rotor of small and medium-sized wind driven generator

Technical Field

The invention relates to a wind driven generator, in particular to a manufacturing process of a rare earth cerium magnet motor stator and rotor of a small and medium-sized wind driven generator.

Background

At present, all types of wind driven generators mainly adopt direct-drive permanent magnet rare earth motors, and the stator and the rotor are made of traditional rare earth neodymium iron boron materials, so that the cost is relatively high, and resources are short. The magnetic performance of the magnet prepared by the traditional process is generally low, and the requirement of the application field on the magnetic steel performance cannot be met. For small wind power applied to pastoral areas, how to improve efficiency and service life is one of key factors related to whether the clean energy technology of wind power generation can be popularized and popularized. The iron and steel institute develops a novel preparation process based on research of high-abundance Ce rare earth permanent magnet materials of material genetic engineering, and declares a plurality of patents such as a high-coercivity sintered Ce magnet or a Ce-rich magnet, and experimental data show that the application of the high-abundance Ce magnet to a wind power permanent magnet motor is completely feasible, when the cerium-substituted rare earth proportion reaches 20%, the maximum magnetic energy product is more than 36MGOe, the coercivity is more than 20KOe, and the research on the adoption of the Ce magnet in wind power is an important way for effectively reducing the cost of the motor.

Disclosure of Invention

The invention aims to solve the technical problems of poor overspeed performance, large starting resistance moment and the like of the existing wind driven generator by providing a manufacturing process of a stator rotor of a rare earth cerium magnet motor of a small and medium-sized wind driven generator, and the manufacturing process is used for manufacturing a rotor punching sheet and a stator punching sheet by using high-abundance cerium permanent magnet materials. In addition, the performance of the cerium magnet is optimized, so that the power generation performance of the small wind driven generator is optimized. And the parameters of the motor are optimized by calculating the electromagnetic performance. The rotor assembly and the stator assembly are manufactured by adopting fractional slot rotor punching and chute stator punching in a press fit way, so that the starting resistance moment, which is a critical parameter of the motor, is reduced; the dovetail groove rotor structure is adopted, the magnetic steel permanent magnet is firmly embedded, and the operation reliability is improved.

The technical problem to be solved by the invention is realized by the following manufacturing process:

1. the processing technology of the generator rotor assembly comprises the following steps:

1. punching a rotor punching sheet: preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, punching a dovetail groove, a vent hole and a rivet hole by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of punching sheets to be arranged in a crossed manner, and the longitudinal position of each punching sheet on the steel belt is strictly positioned;

2. hanging the rotor punching sheet on a bracket, checking impurities and burrs of the vent hole and the rivet hole, wrapping the rotor punching sheet with a rubber plate, and matching keys according to the drawing requirements;

3. sequentially stacking rotor punching sheets according to the drawing requirements, wherein the directions of burrs are consistent, and the directions of positioning grooves are consistent;

4. riveting and fixing the rotor assembly from the rivet hole by using a phi 10 rivet;

5. the rotor assembly is manufactured by rotor punching sheets and rare earth cerium magnetic steel according to the drawing requirements, and an independent exciting winding is not needed, so that the magnetic loss is low. The rotor assembly adopts an embedded structure and is matched with the rotor dovetail groove. Because the rotor groove is a dovetail groove, the magnetic steel can be ensured to be safely fixed in the rotor, and can not be thrown out to be taken off or loosened under the high rotating speed of the motor, so that the service life of the motor is prolonged. When the magnetic steel is installed in the slot, N, S poles are required to be arranged alternately, and the magnetic steel coated with adhesive glue is embedded into the dovetail slot by adopting a special tool; the adhesive glue is preferably modified epoxy structural glue;

6. curing: after embedding and bonding the magnetic steel to a proper position of a rotor dovetail groove, curing, wherein the room temperature is required to be above 18 ℃ for 4-6 hours; the high-temperature impact resistance, the high-temperature high-humidity resistance and the salt fog resistance are good;

7. cleaning sundries on the surface of the rotor assembly, and spraying mildew-proof paint.

2. The stator assembly processing technology comprises the following steps:

1. stamping a stator punching sheet: stamping the fractional slot stator punching sheet according to the drawing requirements; preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, blanking a fractional slot stator embedded slot once by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of stator punching sheets to be arranged in a crossed manner, and the longitudinal position of each stator punching sheet on the steel belt is strictly positioned;

2. and (3) pressing the stator punching sheets according to the drawing requirement, stacking the stator punching sheets according to the sequence, enabling the directions of burrs to be consistent, and placing the stator punching sheets on a pressing tool with chute positioning keys for riveting the stator punching sheets. The tooling comprises a stator inner hole positioning tire, a buckle piece, a bottom tire and a compression ring, wherein the surface of the stator inner hole positioning tire is provided with chute positioning keys, and when stator punching pieces are pressed, stator punching pieces are sequentially arranged in stator grooves according to chute positioning grooves so as to form chute, so that the aim of reducing starting resistance moment is achieved;

3. and (5) hanging the stator assembly to a lower line position. Arranging insulating paper and winding wires in the slots, embedding coils according to the pitch Y=1-3, checking stator coils, and arranging all the wire coils in a pairing way;

4. slot wedge and winding lead-out wire are arranged and welded;

5. polishing the joint on the coil smoothly, and padding the end part of the coil according to the process requirement, and impregnating the coil with paint;

6. shaping, and checking whether each winding is short-circuited or open-circuited;

7. baking and pressing the stator assembly: heating, namely heating by a direct current power supply, wherein the average heating temperature per hour is 10 ℃, the secondary pressure is added when the temperature is about 120 ℃, then stopping heating when the temperature is 140-150 ℃, preserving heat for 10 hours, cutting off the power supply when cooling, and rapidly cooling by a natural cooling or fan, wherein when the temperature of the stator assembly is close to the ambient temperature, the baking and pressing tool can be removed;

8. pressing the stator assembly after paint dipping into a shell, and spraying mildew-proof paint;

9. withstand voltage test was performed.

3. Assembled motor

1. Front and rear bearings are pressed on the rotor shaft;

2. putting the rotor assembly into the stator assembly, paying attention to anti-collision and anti-pinch fingers;

3. pressing the front end cover and the rear end cover;

4, checking and testing: and detecting the starting resistance moment and the electrical property of the motor by using an instrument.

The invention has the advantages that:

1. and the power generation performance of the generator is improved. The double main phase process is adopted, so that the main phase particles of the double main phase cerium magnet are opened into a core-shell mechanism with a coupling effect, the anti-magnetization performance of the magnet is changed, the defect that the performance of the traditional single alloy component sintered magnet is rapidly reduced is overcome, the anti-magnetization performance of the magnet is changed, and the service life of the motor is prolonged.

2. In the aspect of motor design, the design and manufacturing process of the cerium motor mainly adopts a novel stator-rotor structure so as to improve the running reliability of the motor and reduce the starting resistance moment. If the stator fractional slot is adopted, the stator fractional slot is skewed by a slot angle during press fitting, the magnetic resistance is obviously reduced, the starting resistance moment of the motor is greatly reduced, and the starting wind speed of the wind driven generator is expanded; the dovetail slot rotor technology is adopted to firmly fix the permanent magnet steel, improve the overspeed performance of the motor and prolong the service life of the motor.

Drawings

FIG. 1 is a schematic diagram of a rare earth cerium motor of an FD3.8-2000W wind turbine

FIG. 2 is a schematic diagram of a rare earth cerium motor magnet rotor of an FD3.8-2000W wind turbine

FIG. 3 is a partial enlarged view of FIG. 2A

FIG. 4 is an enlarged view of part B of FIG. 1

FIG. 5 is an enlarged view of part of E in FIG. 1

FIG. 6 is a diagram of the magnetic steel structure

FIG. 7 is a side view of the magnetic steel of FIG. 6

FIG. 8 is a view showing the assembly of a dovetail slot of a magnet steel embedded rotor

Fig. 9 is a schematic diagram of a stator press-fit diagonal key tooling

Reference numerals

1 rotor assembly 2 rotor punching 3 rivet hole 4 dovetail slot 5 vent hole 6 stator assembly 7 stator punching 8 positioning slot 9 embedding slot 10 magnetic steel 11 stator inner hole positioning tire 12 buckle 13 bottom tire 14 compression ring 15 chute positioning key 16 rotor shaft 17 bearing 18 end cover

In the figure: c-direction of magnetization

Detailed Description

In order to more clearly illustrate the technical scheme of the embodiment of the invention, the invention is explained in detail below with reference to the accompanying drawings, so that the advantages and the characteristics of the manufacturing process of the rare earth cerium magnet motor stator and rotor of the small and medium-sized wind driven generator are easier to be understood by those skilled in the art, and the protection scope of the invention is defined more clearly.

Taking FD3.8-2000W wind driven generator cerium magnet motor stator and rotor processing as an example, the processing technology is specifically described:

1. the processing technology of the generator rotor assembly 1 comprises the following steps:

1. punching the rotor punching sheet 2: as shown in fig. 2 and 3, preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, punching a dovetail groove 4, a vent hole 5 and a rivet hole 3 by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of punching sheets to be arranged in a crossed manner, and the longitudinal position of each punching sheet on the steel belt is strictly positioned;

2. hanging the rotor punching sheet 2 on a bracket, checking impurities and burrs of the vent hole 5 and the rivet hole 3, wrapping the rotor punching sheet with a rubber plate, and matching keys according to the drawing requirements;

3. sequentially stacking rotor punching sheets according to the drawing requirements, wherein the directions of burrs are consistent, and the directions of the positioning grooves 8 are consistent;

4. riveting and fixing the rotor assembly 1 from the rivet hole 3 by using a phi 10 rivet;

5. the rotor assembly 1 is processed according to the drawing requirements, and the rotor assembly 1 is made of a rotor punching sheet 2 and rare earth cerium magnetic steel 10, and an independent exciting winding is not needed, so that the magnetic loss is low. As shown in fig. 6 and 7, the rotor assembly 1 and the magnetic steel 10 adopt an embedded structure and are matched with the rotor dovetail groove 4. Because the rotor groove is the dovetail groove 4, the magnetic steel 10 can be ensured to be safely fixed in the rotor assembly 1, and can not be thrown out to be taken off or loosened under the high rotating speed of the motor, so that the service life of the motor is prolonged. When the magnetic steel 10 is installed in the slot, N, S poles are required to be arranged alternately, and a special tool is adopted to embed the magnetic steel 10 coated with adhesive into the dovetail slot 4; the adhesive glue is preferably modified epoxy structural glue;

6. curing: after embedding and bonding the magnetic steel 10 to a proper position of the rotor dovetail groove 4, curing the magnetic steel at the room temperature of more than 18 ℃ for 4 to 6 hours; the high-temperature impact resistance, the high-temperature high-humidity resistance and the salt fog resistance are good;

7. cleaning sundries on the surface of the rotor assembly 1, and spraying mildew-proof paint.

2. The stator assembly 6 processing technology comprises the following steps:

1. punching stator punching sheet 7: as shown in fig. 4 and 5, the fractional slot stator punching sheet 7 is punched according to the drawing requirements; preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, blanking a fractional slot stator embedded slot 9 once by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of stator punching sheets to be arranged in a crossed manner, and the longitudinal position of each stator punching sheet 7 on the steel belt is strictly positioned;

2. the stator punching sheets 7 are pressed according to the drawing requirement, the stator punching sheets 7 are stacked according to the sequence, the directions of burrs are consistent, and the stator punching sheets are placed on a pressing tool with chute positioning grooves 15 to rivet the stator punching sheets 7. As shown in fig. 8 and 9, the tool comprises a stator inner hole positioning tire 11, a buckle sheet 12, a bottom tire 13 and a compression ring 14, wherein a chute positioning groove 15 is processed on the surface of the stator inner hole positioning tire 11, and when the stator punching sheet 7 is pressed, the stator punching sheet 7 is sequentially arranged in the chute positioning groove 15, so that a chute is formed;

3. the stator assembly 6 is suspended to the down-line position. Arranging insulating paper and winding wires in the slots, embedding coils according to the pitch Y=1-3, checking stator coils, and arranging all the wire coils in a pairing way;

4. slot wedge and winding lead-out wire are arranged and welded;

5. polishing the joint on the coil smoothly, and padding the end part of the coil according to the process requirement, and impregnating the coil with paint;

6. shaping, and checking whether each winding is short-circuited or open-circuited;

7. baking and pressing the stator assembly 6: heating, namely heating by a direct current power supply, wherein the average heating temperature per hour is 10 ℃, the secondary pressure is added when the temperature is about 120 ℃, then stopping heating when the temperature is 140-150 ℃, preserving heat for 10 hours, cutting off the power supply when cooling, and rapidly cooling by a natural cooling or fan, wherein when the temperature of the stator assembly 6 is close to the ambient temperature, the baking and pressing tool can be removed;

8. pressing the stator assembly 6 after paint dipping into a shell, and spraying mildew-proof paint;

9. withstand voltage test was performed.

3. Assembling a motor: as shown in figure 1 of the drawings,

1. front and rear bearings 17 are press-fitted on the rotor shaft 16;

2. putting the rotor assembly 1 into the stator assembly 6, paying attention to collision prevention and finger clamping prevention;

3. pressing the front and rear end caps 18;

4, checking and testing: and detecting the starting resistance moment and the electrical property of the motor by using an instrument.

The test data are as follows:

comparing the performance test data of the rare earth cerium magnet motor with the performance test data of the neodymium-iron-boron traditional magnet motor:

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Claims (1)

1. a process for manufacturing a stator and a rotor of a rare earth cerium magnet motor of a medium and small wind driven generator is characterized in that,

1. the processing technology of the generator rotor assembly comprises the following steps:

1. punching a rotor punching sheet: preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, punching a dovetail groove, a vent hole and a rivet hole by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of punching sheets to be arranged in a crossed manner, and the longitudinal position of each punching sheet on the steel belt is strictly positioned;

2. hanging the rotor punching sheet on a bracket, checking impurities and burrs of the vent hole and the rivet hole, wrapping the rotor punching sheet with a rubber plate, and matching keys according to the drawing requirements;

3. sequentially stacking rotor punching sheets according to the drawing requirements, wherein the directions of burrs are consistent, and the directions of positioning grooves are consistent;

4. riveting and fixing the rotor assembly from the rivet hole by using a phi 10 rivet;

5. processing a rotor assembly according to the drawing requirements, wherein the rotor assembly is made of a rotor punching sheet and rare earth cerium magnetic steel; the rotor assembly and the magnetic steel adopt an embedded structure and are matched with a rotor dovetail groove; when the magnetic steel is installed in the slot, N, S poles are required to be arranged alternately, and the magnetic steel coated with adhesive glue is embedded into the dovetail slot by adopting a special tool; the adhesive glue is preferably modified epoxy structural glue;

6. curing: after embedding and bonding the magnetic steel to a proper position of a rotor dovetail groove, curing, wherein the room temperature is required to be above 18 ℃ for 4-6 hours;

7. cleaning sundries on the surface of the rotor assembly, and spraying mildew-proof paint;

2. the stator assembly processing technology comprises the following steps:

1. stamping a stator punching sheet: stamping the fractional slot stator punching sheet according to the drawing requirements; preparing a cerium steel sheet steel belt with the thickness of 0.5mm according to the drawing requirement, blanking a fractional slot stator embedded slot once by adopting a duplex die, wherein the width of the steel belt only allows 2-3 rows of stator punching sheets to be arranged in a crossed manner, and the longitudinal position of each stator punching sheet on the steel belt is strictly positioned;

2. the stator punching sheets are pressed according to the drawing requirement, the stator punching sheets are stacked in sequence, the directions of burrs are consistent, the stator punching sheets are placed on a pressing tool with chute positioning grooves, the stator punching sheets are riveted, the tool comprises a stator inner hole positioning tire, a buckle sheet, a bottom tire and a pressing ring, the chute positioning grooves are processed on the surface of the stator inner hole positioning tire, and when the stator punching sheets are pressed, the stator punching sheets are sequentially arranged in the chute positioning grooves, so that chute forming is realized;

3. hanging the stator assembly to a down-line position, arranging insulating paper and winding wires in the slots, embedding coils according to the pitch Y=1-3, checking the stator coils, and arranging all the wire coils in pairs;

4. slot wedge and winding lead-out wire are arranged and welded;

5. polishing the joint on the coil smoothly, and padding the end part of the coil according to the process requirement, and impregnating the coil with paint;

6. shaping, and checking whether each winding is short-circuited or open-circuited;

7. baking and pressing the stator assembly: heating, namely heating by a direct current power supply, wherein the average heating temperature per hour is 10 ℃, the secondary pressure is added when the temperature is about 120 ℃, then stopping heating when the temperature is 140-150 ℃, preserving heat for 10 hours, cutting off the power supply when cooling, and rapidly cooling by a natural cooling or fan, wherein when the temperature of the stator assembly is close to the ambient temperature, the baking and pressing tool can be removed;

8. pressing the stator assembly after paint dipping into a shell, and spraying mildew-proof paint;

9. performing a withstand voltage test;

3. assembling a motor:

1. front and rear bearings are pressed on the rotor shaft;

2. putting the rotor assembly into the stator assembly, paying attention to anti-collision and anti-pinch fingers;

3. pressing the front end cover and the rear end cover;

4. checking and testing: and detecting the starting resistance moment and the electrical property of the motor by using an instrument.

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