CN212012301U

CN212012301U - Rotor of surface-mounted high-speed permanent magnet motor

Info

Publication number: CN212012301U
Application number: CN202021181409.5U
Authority: CN
Inventors: 卢茂祥; 徐少聃; 李淑晶
Original assignee: Regal Beloit Suzhou Co Ltd
Current assignee: Regal Beloit Suzhou Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2020-11-24
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a high-speed permanent-magnet machine's of table formula rotor, including rotor core, pivot, permanent magnet and protective sheath, rotor core is cylindrical, sets up the recess of a plurality of axial extension on its outer wall, and the permanent magnet setting is in the recess, and the pivot setting is in rotor core, and its outer wall and rotor core's inner wall taper fit, protective sheath ring cover are in order to protect the permanent magnet outside rotor core. Through set up the protective sheath outside the permanent magnet body, produce certain pretightning force to the permanent magnet, prevent that in operation rotor spare part outwards expands and the pine takes off, leads to spare part to damage to burst or rotor vibration increase. The rotor core and the rotating shaft are installed in a matched mode through a taper surface, the permanent magnet is prevented from being heated and demagnetized through cold pressing, and the protective sleeve generates relative inward pretightening force through expansion of the rotor core, so that the permanent magnet is protected; meanwhile, the matching surface of the rotor core and the rotating shaft is a full circle, so that the unbalance of the motor rotor with the height can be corrected.

Description

Rotor of surface-mounted high-speed permanent magnet motor

Technical Field

The utility model relates to the field of electric machines, in particular to high-speed permanent-magnet machine's of surface mounting formula rotor.

Background

The research on high-speed permanent magnet synchronous motors is becoming one of the research hotspots in the field of electrical engineering. Compared with the common motor, the high-speed permanent magnet synchronous motor has the advantages of high efficiency, high power density, small volume, high power factor, good control characteristic, noise reduction and the like, and is applied more and more in recent years. Because the volume of the motor is far smaller than that of a medium-low speed motor with the same output power, the motor can directly drive a high-speed load, eliminates the connection of a traditional gear box, and avoids loss, mechanical vibration and noise caused by the gear box, thereby reducing the volume of the whole set of equipment, reducing the maintenance cost and improving the efficiency and the precision of the whole transmission system.

The special advantages of the high-speed permanent magnet synchronous motor enable the high-speed permanent magnet synchronous motor to be wide in application range, and have considerable development prospect and market demand, such as high-speed grinding, cutting, turning, milling and other processing centers in the machining industry, high-speed centrifugal compressors for central air conditioners, high-speed centrifugal dryers, turbo compressors and high-pressure water pumps; meanwhile, the standby power supplies of some large data centers and large shopping malls also use high-speed permanent magnet motors; in addition, the high-speed permanent magnet synchronous motor has good application prospect in the fields of hybrid electric vehicles, aviation, navigation, oil field detection and the like.

And the assembly is carried out the cooperation installation through keyway and key between current rotor core and the pivot, nevertheless because always can have the clearance between keyway and the key, is unfavorable for the dynamic balance of high-speed rotor to rectify.

SUMMERY OF THE UTILITY MODEL

To the defect that prior art exists above, the utility model discloses a main aim at overcomes prior art's weak point, discloses a high-speed permanent-magnet machine's of table subsides formula rotor, including rotor core, pivot, permanent magnet and protective sheath, rotor core is cylindrical, sets up a plurality of axial extension's recess on its outer wall, the permanent magnet sets up in the recess, the pivot sets up in the rotor core, its outer wall with rotor core's inner wall taper fit, protective sheath ring cover in rotor core is outer in order to protect the permanent magnet.

Further, the taper ratio of the rotating shaft to the taper matching surface of the rotor core is 1: 40.

Furthermore, a clamping edge is radially and convexly arranged on the lower bottom circle of the cone frustum of the rotating shaft so as to limit the installation position of the rotor iron core.

Further, the protective sheath is made of alloy steel or carbon fiber.

The utility model discloses the beneficial effect who gains:

through set up the protective sheath outside the permanent magnet body, produce certain pretightning force to the permanent magnet, prevent that in operation rotor spare part outwards expands and the pine takes off, leads to spare part to damage to burst or rotor vibration increase. The rotor core and the rotating shaft are installed in a matched mode through a taper surface, the permanent magnet is prevented from being heated and demagnetized through cold pressing, and the protective sleeve generates relative inward pretightening force through expansion of the rotor core, so that the permanent magnet is protected; meanwhile, the matching surface of the rotor core and the rotating shaft is a full circle, so that the unbalance of the motor rotor with the height can be corrected.

Drawings

Fig. 1 is a schematic structural view of a rotor of a surface-mounted high-speed permanent magnet motor according to the present invention;

the reference numbers are as follows:

1. rotor core, 2, pivot, 3, permanent magnet, 4, protective sheath, 5, card reason.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The utility model provides a high-speed permanent-magnet machine's of table formula rotor, includes rotor core 1, pivot 2, permanent magnet 3 and protective sheath 4, and rotor core 1 is cylindrical, sets up the recess of a plurality of axial extension on its outer wall, and the permanent magnet setting is in the recess, and rotor core 1's inner wall is the circular cone frustum structure, and is corresponding, be provided with the circular cone fitting surface with rotor core 1's inner wall complex in pivot 2, and rotor core 1 cover is established outside pivot 2, accomplishes the assembly through the technology of colding pressing. The protective sleeve 4 is sleeved outside the rotor core 1 to protect the permanent magnet 3. By utilizing the assembly process of the stator core 1 and the rotating shaft 2, in the process, the rotating shaft 2 enables the rotor core 1 to expand outwards to enable the protective sleeve 4 to generate an inward pretightening force for the outer circular surface of the permanent magnet 3, so that the protective sleeve 4 is tightly attached to the permanent magnet 3. In addition, the rotor core 1 and the rotating shaft 2 are assembled in a taper fit mode, after the rotor core 1 is pressed into the rotating shaft 2, the rotating shaft generates radial outward expansion force, and meanwhile, the rotor core 1 expands to generate radial inward holding force, so that the rotor core 1 and the rotating shaft 2 are firmly assembled together, and the rotor core 1 and the rotating shaft 2 are guaranteed to generate enough tangential force to transmit torque.

In one embodiment, the taper ratio of the taper mating surface of the rotating shaft 2 and the rotor core 1 is 1: 40.

In one embodiment, the lower base circle of the truncated cone of the rotating shaft 2 is provided with a clamping edge 5 in a radial protruding mode so as to limit the installation position of the rotor core 1. After the rotor is debugged according to the previous stage size, each rotor assembly only needs to press the rotor core 1 into the rotating shaft 2 and then the end face of the rotor core is attached to the clamping edge 5, the rotor is installed, and the assembly is convenient and simple.

In one embodiment, the protective sheath 4 is made of alloy steel or carbon fiber.

In addition, the protective sleeve can be installed according to the principle that the protective sleeve expands with heat and contracts with cold, namely the protective sleeve is assembled on the surface of the permanent magnet after being heated, the diameter of the protective sleeve is larger than that of the protective sleeve during cooling due to thermal expansion of materials of the protective sleeve, and then the protective sleeve is sleeved on the rotor iron core and clings to the permanent magnet after being cooled to generate pretightening force. Generally, the interference of the assembly is generally less than 0.2mm, depending on the influence of the coefficient of expansion of the material itself. Compared with the cold pressing assembly with the matched tapered surface, the method has the advantages that the process is very complex in the implementation process, and the permanent magnet is heated to have the risk of loss of magnetism.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the spirit and scope of the present invention.

Claims

1. The utility model provides a high-speed permanent-magnet machine's of table formula rotor, its characterized in that, includes rotor core, pivot, permanent magnet and protective sheath, rotor core is cylindrical, sets up the recess of a plurality of axial extension on its outer wall, the permanent magnet sets up in the recess, the pivot sets up in the rotor core, its outer wall with rotor core's inner wall taper fit, protective sheath ring cover in rotor core is outer in order to protect the permanent magnet.

2. The rotor of a surface-mounted high-speed permanent magnet motor according to claim 1, wherein the taper ratio of the taper matching surface of the rotating shaft and the rotor core is 1: 40.

3. The rotor of a surface-mounted high-speed permanent magnet motor according to claim 1, wherein a lower base circle of the truncated cone of the rotating shaft radially protrudes to form a clamping edge to limit the installation position of the rotor core.

4. The rotor of a surface-mounted high-speed permanent magnet motor according to claim 1, wherein the protective sleeve is made of alloy steel or carbon fiber.