CN202737705U - Rotor core for three-phase asynchronous motor of coal mill - Google Patents
Rotor core for three-phase asynchronous motor of coal mill Download PDFInfo
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- CN202737705U CN202737705U CN 201220404781 CN201220404781U CN202737705U CN 202737705 U CN202737705 U CN 202737705U CN 201220404781 CN201220404781 CN 201220404781 CN 201220404781 U CN201220404781 U CN 201220404781U CN 202737705 U CN202737705 U CN 202737705U
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- cage
- starting
- asynchronous motor
- phase asynchronous
- sliver
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Abstract
The utility model relates to a rotor core for a three-phase asynchronous motor of a coal mill and belongs to the technical field of electromotors. The rotor core comprises a plurality of rotor punching sheets which are piled together, upper cage conduction bars and lower cage conduction bars, wherein the rotor punching sheets are provided with a plurality of starting cage grooves and a plurality of working cage grooves, with the starting cage grooves disposed outside the circle formed by the working cage grooves; the upper cage conduction bars are disposed inside the starting cage grooves; and lower cage conduction bars are disposed inside the working cage grooves. The rotor core of the utility model is simple, compact and reasonable in structure; starting performance and working performance of the three-phase asynchronous motor is improved through altering the shape of rotor grooves, and by using the skin effect which enables effective height of conductors inside the grooves to be reduced, thereby magnifying resistance and reducing leakage reactance of the grooves.
Description
Technical field
The utility model relates to a kind of coal pulverizer three-phase asynchronous motor rotor iron core, belongs 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 (namely stator winding) to produce rotating magnetic field and act on the closed aluminium frame of rotor squirrel-cage formula to form magnetoelectricity dynamic rotation moment of torsion.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 alternating current machine, can be synchronous machine or asynchronous machine (motor stator rotational speed of magnetic field and rotor rotating speed do not keep same leg speed).Motor mainly is comprised of stator and rotor, and the direction of electrified wire stressed motion 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.The advantages such as that threephase asynchronous has is simple in structure, be easy to control, efficient is high, cost is low and power is large 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 larger, and starting torque is little.Therefore when the design threephase asynchronous, wish that its starting torque is large, starting current is little.This is because the starting torque of threephase asynchronous is directly proportional with rotor loss, and rotor resistance is larger for well when wishing to start; But in order to raise the efficiency, after finishing, starting wishes that rotor resistance is smaller for well.General threephase asynchronous is difficult to accomplish this point; Although 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 purpose of this utility model is to overcome above-mentioned weak point, thereby a kind of coal pulverizer three-phase asynchronous motor rotor iron core is provided, and utilizes the motor kelvin effect to improve starting performance and the service behaviour of motor.
The technical scheme that provides according to the utility model, coal pulverizer three-phase asynchronous motor rotor iron core comprises a plurality of rotor punchings that are stacked, upper cage sliver and lower 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.Upper cage sliver is arranged in starting cage slot, and lower cage sliver is arranged in work cage slot.
Described work cage slot is rectangle.Described starting cage slot is circular.Described work cage slot is communicated with starting cage slot.Described upper cage sliver is circular.Described lower cage sliver is rectangle.The sectional area of described work cage slot is greater than the sectional area of starting cage slot.The sectional area of described lower cage sliver is greater than the sectional area of upper cage sliver.Described upper cage sliver adopts Cu alloy material to make.Described lower cage sliver adopts the red copper material to make.
Compared with the prior art the utility model has the following advantages: the utility model is simple, compact and reasonable for structure; By 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 the utility model structural representation.
Fig. 2 is A place enlarged drawing among Fig. 1.
Description of reference numerals: cage sliver under 1-rotor punching, 2-starting cage slot, the upper cage sliver of 3-, 4-work cage slot, the 5-.
Embodiment
Following the utility model is further described in connection with the embodiment in the accompanying drawing:
Shown in Fig. 1 ~ 2, the utility model comprises a plurality of rotor punchings that are stacked 1, upper cage sliver 3 and lower cage sliver 5, and rotor punching 1 is provided with a plurality of starting cage slots 2 and work cage slot 4.Work cage slot 4 is rectangle.Starting cage slot 2 is positioned at work cage slot 4 outer rings, is circle.Described work cage slot 4 is communicated with starting cage slot 2.
The sectional area of described work cage slot 4 is greater than the sectional area of starting cage slot 2, and the sectional area of lower cage sliver 5 is greater than the sectional area of upper cage sliver 3.
Described upper cage sliver 3 adopts the higher Cu alloy material of resistivity to make.Lower cage sliver 5 adopts the lower red copper material of resistivity to make.
Rotor punching 1 of the present utility model is provided with a plurality of starting cage slots 2 and work cage slot 4, installs respectively cage sliver 3 and lower cage sliver 5 in starting cage slot 2 and the work cage slot 4, consists of inside and outside two and overlaps independently cage modle winding.Under same sliver electric current, the leakage flux of lower cage modle winding interlinkage is always much more than upper cage modle winding, so the leakage reactance of lower cage modle winding is more much bigger than upper cage modle winding.Upper cage sliver 3 adopts Cu alloy material, and resistance is larger; Lower cage sliver 5 sectional areas are larger, and adopt the lower hard red copper material of resistivity to make, and resistance is less.Start moment, according to kelvin effect (for the alternating current in the conductor, the current density at close conductive surface place is greater than the phenomenon of conductor internal current density), the sliver electric current concentrates on cage, upper cage modle winding resistance is large, produce larger starting torque, so generally upper cage modle winding is called the starting cage; During normal operation, lower cage modle winding resistance is little, and electric current mainly concentrates on lower cage modle winding when normally moving, and produces the operation torque of motor, so generally lower cage modle winding is called work cage.Owing to rotor punching 1 is designed to two basket structures, on the almost not impact of rotor punching 1 electromagnetic performance, the increase starting torque that obtains, the successful that reduces starting current.Work cage slot 4 is designed to rectangular channel, is guaranteeing can to make rotor copper loss less in the close rational situation of rotor magnetic, and in the situation of equal-wattage, efficient can improve.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited 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 utility model and design, all should think to be included within the protection range of the present utility model.
Claims (10)
1. coal pulverizer three-phase asynchronous motor rotor iron core, comprise a plurality of rotor punchings that are stacked (1), upper cage sliver (3) and lower 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; Upper cage sliver (3) is arranged in starting cage slot (2), and lower cage sliver (5) is arranged in work cage slot (4).
2. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1, it is characterized in that: described work cage slot (4) is rectangle.
3. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1 is characterized in that: described starting cage slot (2) is for circular.
4. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1, it is characterized in that: described work cage slot (4) is communicated with starting cage slot (2).
5. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1 is characterized in that: described upper cage sliver (3) is for circular.
6. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1, it is characterized in that: described lower cage sliver (5) is rectangle.
7. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1, it is characterized in that: the sectional area of described work cage slot (4) is greater than the sectional area of starting cage slot (2).
8. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1, it is characterized in that: the sectional area of described lower cage sliver (5) is greater than the sectional area of upper cage sliver (3).
9. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1 is characterized in that: the making of described upper cage sliver (3) employing Cu alloy material.
10. coal pulverizer three-phase asynchronous motor rotor iron core as claimed in claim 1 is characterized in that: the making of described lower cage sliver (5) employing red copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220404781 CN202737705U (en) | 2012-08-15 | 2012-08-15 | Rotor core for three-phase asynchronous motor of coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220404781 CN202737705U (en) | 2012-08-15 | 2012-08-15 | Rotor core for three-phase asynchronous motor of coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202737705U true CN202737705U (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220404781 Expired - Lifetime CN202737705U (en) | 2012-08-15 | 2012-08-15 | Rotor core for three-phase asynchronous motor of coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202737705U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780370A (en) * | 2012-08-15 | 2012-11-14 | 中电电机股份有限公司 | Rotor core of three-phase asynchronous motor of coal mill |
-
2012
- 2012-08-15 CN CN 201220404781 patent/CN202737705U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780370A (en) * | 2012-08-15 | 2012-11-14 | 中电电机股份有限公司 | Rotor core of three-phase asynchronous motor of coal mill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |