CN110752692A

CN110752692A - Novel low-speed large-torque permanent magnet motor rotor structure

Info

Publication number: CN110752692A
Application number: CN201910715259.7A
Authority: CN
Inventors: 陈虎威; 钱伟; 赵勇
Original assignee: Jiangsu Aerospace Power Electric Co Ltd
Current assignee: Jiangsu Aerospace Power Electric Co Ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-02-04

Abstract

The invention discloses a novel low-speed high-torque permanent magnet motor rotor structure which comprises a rotor core formed by laminating a plurality of rotor punching sheets, rotor end plates and rotor core pressing plates, wherein the rotor end plates and the rotor core pressing plates are arranged at two ends of the rotor core, the rotor core consists of an inner core, an outer cylinder and a web plate connected between the inner core and the outer cylinder, a notch is formed in the outer edge of the rotor core, a rotor magnetic steel groove is radially formed in the rotor core along the notch, a magnetic steel sheet is embedded in the rotor magnetic steel groove, a plurality of ventilation grooves are uniformly distributed on the ring surface of the rotor core along the axial direction, at least 3 pieces of web plates are uniformly distributed on. The motor rotor structure has a good cooling effect, improves the output capacity of the motor, reduces the using amount of magnetic steel and reduces the production cost.

Description

Novel low-speed large-torque permanent magnet motor rotor structure

Technical Field

The invention relates to the technical field of permanent magnet motors, in particular to a novel low-speed large-torque permanent magnet motor rotor structure.

Background

The permanent magnet motor has the characteristics of low cost, low energy consumption, simple structure, low failure rate and the like, and is more and more widely applied. Most permanent magnet machines include a rotor and a stator. A large number of magnetic steel sheets are distributed on the rotor, and a magnet exciting coil is arranged on the stator. The magnetic force generated by the magnet exciting coil and the magnetic force of the magnetic steel sheet generate acting force, and then the rotation of the rotor is realized.

During the energy conversion process of the motor, various losses exist in the motor, such as winding loss generated by current in a conductor, core loss caused by alternating magnetic fields in the core, mechanical loss caused by ventilation and mechanical friction and the like. These losses are converted into heat that propagates to the surrounding medium, raising the temperature of the motor components. When the temperature exceeds the temperature allowed by the insulation, the insulation and even the motor will be damaged. The existing permanent magnet motor is difficult to operate in a high-temperature environment, the magnetic force of the magnetic steel sheet is quickly reduced in a high-temperature environment, and the service life of the permanent magnet motor can be shortened. The permanent magnet motor which runs under a high load state for a long time has the defects that the ambient temperature of a rotor is often higher, the service life of the permanent magnet motor can be shortened, the use amount of magnetic steel is large, and the output performance of the motor is not high.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: overcome above-mentioned prior art's defect, provide a novel big torque permanent-magnet machine rotor structure of low-speed, have better cooling effect, improve the output capacity of motor, reduce the magnet steel quantity, reduction in production cost.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a novel big torque permanent-magnet machine rotor structure of low-speed, includes to fold the rotor core that forms, install rotor end plate and the rotor core clamp plate at the rotor core both ends by a plurality of rotor punching, rotor core constitute by inner core, urceolus and the web of connection between inner core and urceolus, the rotor core outward flange set up the breach, rotor core follows the breach radially set up the rotor magnet steel cell type, embed the magnetism steel sheet in the rotor magnet steel cell type, along a plurality of ventilation slots of axial equipartition on the rotor core anchor ring, web circumference equipartition 3 at least, four at least tip flabellums of rotor core clamp plate circumference equipartition, relative rotor core coaxial rotor radial fan that is provided with in the pivot.

Furthermore, the rotor magnetic steel groove is in the shape of ⊥ and consists of a first groove and a second groove which are perpendicular to each other.

Further, the magnetic steel sheet is embedded in the first groove type, the width of the first groove type is slightly larger than that of the magnetic steel sheet and larger than that of the notch, the width direction of the second groove type is overlapped in the length direction of the first groove type, and the length of the first groove type is slightly larger than that of the magnetic steel sheet.

Furthermore, the ventilation slots are circumferentially arrayed on the ring surface of the rotor core, the pitch angle is 9 degrees, and the number of the ventilation slots is 40.

Further, the diameter of the ventilation groove is 32 mm.

Furthermore, the number of the webs is 6, and the width of the webs is 40 mm.

Furthermore, the tip flabellum be curved sand grip, the quantity of circumference equipartition is 20.

The novel rotor structure of the low-speed high-torque permanent magnet motor has the beneficial effects that the rotor magnetic steel groove type adopts an ⊥ type structure, and is matched with magnetic steel in a tangential magnetization mode, so that the magnetic resistance is reduced, the output capacity of the motor is improved, the problems of the motor output and the magnetic steel consumption are solved, the novel structure effectively improves the motor efficiency by about 1.5% and the power factor by about 2% compared with a common low-speed permanent magnet motor of the same type through an actual model machine test of 450kW-60p-75rpm, the end part of a rotor core is provided with end part fan blades, the rotor rotates to drive a rotor radial fan coaxially arranged with the rotor, the fan rotates to provide cooling air flow for the motor, the good cooling effect is achieved, and the service life of the motor is prolonged.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the P-directional structure of FIG. 1;

FIG. 3 is a sectional view taken along line E-E of FIG. 1;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

in the figure, 1, a rotor end plate, 2, a rotor iron core, 21 notches, 3, ventilation grooves, 4, a rotor iron core pressing plate, 5, a rotor magnetic steel groove type, 51, a first groove type, 52, a second groove type, 6, a magnetic steel sheet, 7, end fan blades, 8, a web plate and 9, a rotor radial fan are arranged.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

A novel low-speed high-torque permanent magnet motor rotor structure as shown in fig. 1, which includes a rotor core 2 formed by laminating a plurality of rotor punching sheets, rotor end plates 1 and rotor core pressing plates 4 installed at two ends of the rotor core 2, the rotor core 2 is composed of an inner core, an outer cylinder and a web 8 connected between the inner core and the outer cylinder, a gap 21 is formed in the outer edge of the rotor core 2, a rotor magnetic steel groove 5 (as shown in fig. 4) is radially formed along the gap 21 in the rotor core 2, the rotor magnetic steel groove 5 is "⊥" shaped and is composed of a first groove 51 and a second groove 52 which are perpendicular to each other, a magnetic steel sheet 6 is embedded in the first groove 51, the width of the first groove 51 is slightly larger than the width of the magnetic steel sheet 6 and larger than the width of the gap 21, the width of the second groove 52 is overlapped in the length direction of the first groove 51, the length of the first groove 51 is slightly larger than the length of the magnetic steel sheet 6, a plurality of ventilation slots 3 are axially uniformly distributed on the ring surface of the rotor core 2 (as shown in fig. 3), the rotor core 2 ring surface is circumferentially arrayed, the number of the ventilation slots is 9, the radial fan blades is 40, the radial fan blades, the fan blades are provided with good radial fan blades, the good radial fan blade diameter, the fan blade diameter of the fan blade is provided for cooling fan, the fan blade provided for rotating shaft, the rotating fan, the rotating shaft, the rotating fan is provided with good rotating fan blade of the rotating.

Through the test of 450kW-60p-75rpm of actual prototype, compare with ordinary low-speed permanent-magnet motor of the same type, this novel structure effectively improves motor efficiency and is about 1.5%, and power factor improves about 2%, reduces the inside temperature of motor, promotes the output performance of motor.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a novel big torque permanent-magnet machine rotor structure of low-speed, characterized by: include by a plurality of rotor punching fold rotor core (2) that form, install rotor end plate (1) and rotor core clamp plate (4) at rotor core (2) both ends, rotor core (2) constitute by inner core, urceolus and web (8) of connection between inner core and urceolus, rotor core (2) outward flange set up breach (21), rotor core (2) are followed breach (21) radially set up rotor magnet steel cell type (5), embedded magnet steel sheet (6) of putting of rotor magnet steel cell type (5), follow a plurality of ventilation slots of axial equipartition (3) on rotor core (2) the anchor ring, web (8) circumference equipartition 3 at least, rotor core clamp plate (4) circumference equipartition four at least tip flabellum (7), relative rotor core (2) coaxial rotor radial fan (9) that are provided with in the pivot.

2. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 1, wherein the rotor magnetic steel groove type (5) is ⊥ -shaped and is composed of a first groove type (51) and a second groove type (52) which are perpendicular to each other.

3. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 2, wherein: the magnetic steel sheet (6) is embedded in the first groove type (51), the width of the first groove type (51) is slightly larger than that of the magnetic steel sheet (6) and larger than that of the notch (21), the width direction of the second groove type (52) is overlapped in the length direction of the first groove type (51), and the length of the first groove type (51) is slightly larger than that of the magnetic steel sheet (6).

4. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 1, wherein: the ventilation slots (3) are circumferentially arrayed on the annular surface of the rotor core (2), the pitch angle is 9 degrees, and the number of the ventilation slots is 40.

5. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 4, wherein: the diameter of the ventilation groove (3) is 32 mm.

6. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 1, wherein: the number of the webs (8) is 6, the webs are uniformly distributed along the axial circumference, and the width of the webs (8) is 40 mm.

7. The novel rotor structure of the low-speed high-torque permanent magnet motor as claimed in claim 1, wherein: the end fan blades (7) are arc-shaped raised strips, and the number of the circumferential uniform distribution is 20.