External rotor axial fan with electromagnetic bearing
A technology of electromagnetic bearings and axial flow fans, which is applied to the components of pumping devices for elastic fluids, mechanical equipment, machines/engines, etc., can solve problems such as difficulty in meeting design requirements, axial flow fan damage, and short life. Achieve smooth operation, improve bearing life and reduce mechanical loss
Inactive Publication Date: 2017-01-04
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology
With the increase of motor speed, the life of traditional contact bearings is getting shorter and shorter, and the loss is also increasing, which is difficult to meet the design requirements
For speed-adjustable axial flow fans, since the natural frequency of the impeller cannot be changed, when the natural frequency of the impeller is consistent with the frequency of the fan system at a certain speed, the system will resonate, causing damage to the axial flow fan
Method used
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Embodiment Construction
[0012] The present invention will be further described below in conjunction with the accompanying drawings.
[0013] Such as figure 1 As shown, the outer rotor axial fan of the present invention includes a cylindrical casing 1 , a support frame 2 , an axial fan impeller 3 and an outer rotor motor 4 . Such as image 3 As shown, as an embodiment of the present invention, the support frame 2 may be composed of a support plate 12 and a plurality of ribs 11 , and the plurality of ribs 11 are uniformly welded to the support plate 12 along the circumferential direction of the support plate 12 . The front end of the cylindrical casing 1 is provided with an air inlet 13 , and the rear end of the cylindrical casing 1 is provided with an air outlet 14 . The axial flow fan impeller 3 and the outer rotor motor 4 are placed in the cavity of the cylindrical shell 1 . A support frame 2 is installed at the air outlet 14 of the cylindrical shell 1 , and each rib 11 of the support frame 2 is ...
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The invention discloses an outer-rotor axial flow fan adopting an electromagnet bearing. The outer-rotor axial flow fan comprises a cylindrical shell, a support, an axial flow fan impeller and an outer-rotor motor. The axial flow fan impeller and the outer-rotor motor are arranged in a chamber of the cylindrical shell. The support is arranged at an air outlet of the cylindrical shell and fixedly connected with the cylindrical shell. The outer-rotor motor comprises a motor shell, a first radial electromagnet bearing, a second radial electromagnet bearing, a permanent magnet, a stator core, an axial electromagnet bearing and a stator bearing. The electromagnet bearings, the permanent magnet, the stator core and the stator bearing are arranged in the motor shell. According to the arrangement, by controlling electromagnetic force between a stator and a rotor of each electromagnet bearing, strength of the electromagnet bearings is changed, in this way, fixed frequency of the axial flow fan impeller is actively changed, and system resonance is effectively avoided, so that the fan smoothly runs at full working speed, service life of the bearing is remarkably prolonged and mechanical loss is reduced.
Description
technical field [0001] The invention belongs to the field of fans and relates to an outer rotor axial flow fan. Background technique [0002] External rotor axial flow fans are more and more widely used in the field of fans. The impeller of the fan is directly connected with the rotor and rotates outside the stator, integrating the impeller and the motor. This structure has the advantages of compact design and easy space layout. However, with the increase of industrial demand, the fan speed is getting higher and higher, and the requirements for the motor are also getting higher and higher. With the increase of motor speed, the life of traditional contact bearings is getting shorter and shorter, and the loss is also increasing, which is difficult to meet the design requirements. For speed-adjustable axial flow fans, since the natural frequency of the impeller cannot be changed, when the natural frequency of the impeller is consistent with the frequency of the fan system at a...
Claims
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IPC IPC(8): F04D25/08F04D29/058
CPCF04D25/08F04D29/058
Inventor 陈波
Owner ZHEJIANG SCI-TECH UNIV