CN102780370A - Rotor core of three-phase asynchronous motor of coal mill - Google Patents

Rotor core of three-phase asynchronous motor of coal mill Download PDF

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Publication number
CN102780370A
CN102780370A CN2012102914709A CN201210291470A CN102780370A CN 102780370 A CN102780370 A CN 102780370A CN 2012102914709 A CN2012102914709 A CN 2012102914709A CN 201210291470 A CN201210291470 A CN 201210291470A CN 102780370 A CN102780370 A CN 102780370A
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China
Prior art keywords
cage
slot
starting
rotor core
sliver
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Pending
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CN2012102914709A
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Chinese (zh)
Inventor
李柏榕
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SEC Electric Machinery Co Ltd
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SEC Electric Machinery Co Ltd
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Publication date
Application filed by SEC Electric Machinery Co Ltd filed Critical SEC Electric Machinery Co Ltd
Priority to CN2012102914709A priority Critical patent/CN102780370A/en
Publication of CN102780370A publication Critical patent/CN102780370A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a rotor core of the three-phase asynchronous motor of a coal mill, belonging to the technical field of motors. The rotor core comprises a plurality of superposed rotor punched sheets, cage-loading guide bars and cage-unloading guide bars, wherein a plurality of starting cage slots and working cage slots are arranged on the rotor punched sheets, and the starting cage slots are arranged at the outer rings of the working cage slots. The cage-loading guide bars are located in the starting cage slots, and the lower cage-unloading guide bars are located in the working cage slots. The rotor core disclosed by the invention is simple, compact and reasonable in structure; starting performance and working performance are improved by variation in the shape of a rotor slot and based on the skin effect of a motor, and the effective height of a conductor in the slot is reduced by the skin effect, therefore, the resistance is increased and the leakage reactance of the slot is reduced.

Description

Coal pulverizer threephase asynchronous rotor core
Technical field
The present invention relates to a kind of coal pulverizer threephase asynchronous rotor core, belong to the motor technology field.
Background technology
Motor is a kind of equipment that converts electric energy to mechanical energy.It is to utilize hot-wire coil (stator winding just) to produce rotating magnetic field and act on the closed aluminium frame of rotor squirrel-cage formula to form magnetoelectricity power rotation torque.Motor is by using the power supply difference to be divided into DC motor and alternating current motor, and the motor major part in the electric power system is an alternating current machine, can be synchronous machine or asynchronous machine (motor stator magnetic field rotating speed and rotor rotation rotating speed do not keep same leg speed).Motor mainly is made up of stator and rotor, and electrified wire stressed travel direction in magnetic field is relevant with magnetic induction line (magnetic direction) direction with the sense of current.The motor operation principle be magnetic field to the stressed effect of electric current, motor is rotated.Advantages such as that threephase asynchronous has is simple in structure, be easy to control, efficient is high, cost is low and power is big are widely used in the modern various plant equipment.
The operating state of threephase asynchronous generally is divided into starting, operation and braking.The major defect of existing threephase asynchronous is that starting current is bigger, and starting torque is little.Therefore when the design threephase asynchronous, hope that its starting torque is big, starting current is little.This is because the starting torque of threephase asynchronous is directly proportional with rotor loss, when hoping starting rotor resistance greatly some for well; But in order to raise the efficiency, after accomplishing, starting hopes that rotor resistance is smaller for well.General threephase asynchronous is difficult to accomplish this point; Though and winding-type three-phase asynchronous motor is not difficult to accomplish this point, its cost is higher, and assembly structure is complicated.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, thereby a kind of coal pulverizer threephase asynchronous rotor core is provided, utilize the motor kelvin effect to improve excellent start performance and service behaviour.
According to technical scheme provided by the invention; Coal pulverizer threephase asynchronous rotor core comprises a plurality of folded mutually rotor punchings, goes up cage sliver and following cage sliver; It is characterized in that: rotor punching is provided with a plurality of starting cage slots and work cage slot, and starting cage slot is positioned at the work cage slot outer ring.Last cage sliver is arranged in starting cage slot, and following cage sliver is arranged in work cage slot.
Said work cage slot is a rectangle.Said starting cage slot is circular.Said work cage slot is communicated with starting cage slot.The said cage sliver of going up is circular.Said cage sliver down is a rectangle.The sectional area of said work cage slot is greater than the sectional area of starting cage slot.The sectional area of said cage sliver down is greater than the sectional area of last cage sliver.The said cage sliver of going up adopts Cu alloy material to make.Said cage sliver down adopts the red copper material.
Compared with present technology the present invention has the following advantages: the present invention is simple, compact and reasonable for structure; Through changing the rotor shape, utilize the motor kelvin effect to improve starting performance and service behaviour, kelvin effect reduces groove inner wire effective depth, thereby resistance increases, the groove leakage reactance reduces.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is an A place enlarged drawing among Fig. 1.
Description of reference numerals: cage sliver under 1-rotor punching, 2-starting cage slot, the last cage sliver of 3-, 4-work cage slot, the 5-.
Embodiment
Following the present invention will combine the embodiment in the accompanying drawing to further describe:
Shown in Fig. 1 ~ 2, the present invention includes a plurality of folded mutually rotor punchings 1, go up cage sliver 3 and following cage sliver 5, rotor punching 1 is provided with a plurality of starting cage slots 2 and work cage slot 4.Work cage slot 4 is a rectangle.Starting cage slot 2 is positioned at work cage slot 4 outer rings, is circle.Said work cage slot 4 is communicated with starting cage slot 2.
Last cage sliver 3 is circular, is arranged in starting cage slot 2.Following cage sliver 5 is a rectangle, is arranged in work cage slot 4.Last cage sliver 3 constitutes the separate cage modle winding of inside and outside two covers with following cage sliver 5.
The sectional area of said work cage slot 4 is greater than the sectional area of starting cage slot 2, and the sectional area of following cage sliver 5 is greater than the sectional area of last cage sliver 3.
The said cage sliver 3 of going up adopts the higher Cu alloy material of resistivity to make.Following cage sliver 5 adopts the lower red copper material of resistivity.
Rotor punching 1 of the present invention is provided with a plurality of starting cage slots 2 and work cage slot 4, installs cage sliver 3 and following cage sliver 5 in starting cage slot 2 and the work cage slot 4 respectively, constitutes inside and outside two and overlaps independently cage modle winding.Under same sliver electric current, the leakage flux of following cage modle winding interlinkage is always much more than last cage modle winding, so the leakage reactance of cage modle winding is more much bigger than last cage modle winding down.Last cage sliver 3 adopts Cu alloy material, and resistance is bigger; Following cage sliver 5 sectional areas are bigger, and adopt the lower hard red copper material of resistivity to process, and resistance is less.Start moment; According to kelvin effect (for the alternating current in the conductor; Near the current density at conductive surface place phenomenon greater than conductor internal current density), the sliver current concentration is at last cage, and last cage modle winding resistance is big; Produce bigger starting torque, be called the starting cage so generally will go up the cage modle winding; During normal the operation, following cage modle winding resistance is little, and electric current mainly concentrates on down the cage modle winding when normally moving, and produces the operation torque of motor, so generally will descend the cage modle winding to be called work cage.Because rotor punching 1 is designed to two basket structures, to the almost not influence of rotor punching 1 electromagnetic performance, the increase starting torque that is obtained, the effect that reduces starting current are obvious.Work cage slot 4 is designed to rectangular channel, is guaranteeing can to make rotor copper loss littler under the close rational situation of rotor magnetic, and under the situation of equal-wattage, efficient can improve.
Above-described only is preferred implementation of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present invention and design, all should think to be included within protection scope of the present invention.

Claims (10)

1. coal pulverizer threephase asynchronous rotor core; Comprise a plurality of folded mutually rotor punchings (1), go up cage sliver (3) and following cage sliver (5); It is characterized in that: rotor punching (1) is provided with a plurality of starting cage slots (2) and work cage slot (4), and starting cage slot (2) is positioned at work cage slot (4) outer ring; Last cage sliver (3) is arranged in starting cage slot (2), and following cage sliver (5) is arranged in work cage slot (4).
2. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: said work cage slot (4) is a rectangle.
3. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: said starting cage slot (2) is for circular.
4. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: said work cage slot (4) is communicated with starting cage slot (2).
5. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: the said cage sliver (3) of going up is for circular.
6. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: said cage sliver (5) down is a rectangle.
7. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: the sectional area of said work cage slot (4) is greater than the sectional area of starting cage slot (2).
8. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: the sectional area of said cage sliver (5) down is greater than the sectional area of last cage sliver (3).
9. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: the said cage sliver (3) of going up adopts Cu alloy material to make.
10. coal pulverizer threephase asynchronous rotor core as claimed in claim 1 is characterized in that: said cage sliver (5) down adopts the red copper material.
CN2012102914709A 2012-08-15 2012-08-15 Rotor core of three-phase asynchronous motor of coal mill Pending CN102780370A (en)

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CN2012102914709A CN102780370A (en) 2012-08-15 2012-08-15 Rotor core of three-phase asynchronous motor of coal mill

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Application Number Priority Date Filing Date Title
CN2012102914709A CN102780370A (en) 2012-08-15 2012-08-15 Rotor core of three-phase asynchronous motor of coal mill

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CN102780370A true CN102780370A (en) 2012-11-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849576A (en) * 2017-03-23 2017-06-13 哈尔滨理工大学 A kind of high-starting torque cage-type asynchronous motor rotor punching
CN106972656A (en) * 2017-04-28 2017-07-21 广东美芝制冷设备有限公司 Rotor punching, rotor, induction machine and compressor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86202254U (en) * 1986-04-14 1987-12-23 王常春 Composite cage rotor for asynchronous motor
CN101867272A (en) * 2010-06-30 2010-10-20 无锡哈电电机有限公司 Rotor iron core of two-cage three-phase asynchronous motor
CN202737705U (en) * 2012-08-15 2013-02-13 中电电机股份有限公司 Rotor core for three-phase asynchronous motor of coal mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86202254U (en) * 1986-04-14 1987-12-23 王常春 Composite cage rotor for asynchronous motor
CN101867272A (en) * 2010-06-30 2010-10-20 无锡哈电电机有限公司 Rotor iron core of two-cage three-phase asynchronous motor
CN202737705U (en) * 2012-08-15 2013-02-13 中电电机股份有限公司 Rotor core for three-phase asynchronous motor of coal mill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849576A (en) * 2017-03-23 2017-06-13 哈尔滨理工大学 A kind of high-starting torque cage-type asynchronous motor rotor punching
CN106972656A (en) * 2017-04-28 2017-07-21 广东美芝制冷设备有限公司 Rotor punching, rotor, induction machine and compressor

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Application publication date: 20121114