High-rotating-speed low-noise magnetic suspension outer rotor motor for centrifugal fan

Abstract

The utility model discloses a high-rotating-speed low-noise magnetic suspension outer rotor motor for a centrifugal fan, which belongs to the technical field of motor body design and comprises a casing, a motor outer rotor, a motor stator and a magnetic suspension bearing assembly. The motor stator is arranged in the motor outer rotor; the shell comprises bearing seats which are oppositely arranged, and two ends of the motor outer rotor are mounted in the bearing seats; the magnetic suspension bearing assembly comprises an axial magnetic suspension bearing and a radial magnetic suspension bearing; the radial magnetic suspension bearings are mounted in the bearing seats and sleeve the two ends of the motor outer rotor; the axial magnetic suspension bearing is installed in a bearing seat on one side of the machine shell and located on the side, close to the motor stator, of the radial magnetic suspension bearing. The axial magnetic suspension bearing is sleeved on the motor outer rotor; the axial magnetic suspension bearing and the radial magnetic suspension bearing are not in contact with the motor outer rotor. According to the utility model, the non-contact and non-friction support for the rotor is realized, the rotating speed of the motor is improved, and the vibration and noise of the motor are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor body design, and more specifically relates to a high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan. Background Art

[0002] An outrunner motor has an external rotor and an internal stator. Used in centrifugal fans, the outrunner design makes the motor more compact, facilitating fan design and installation while also improving heat dissipation and air flow. Outrunner motors are suitable for centrifugal fans of all sizes and powers, from small household fans to large industrial ventilation systems. They are widely used in ventilation, air conditioning, and refrigeration systems.

[0003] Traditional outer rotor motors use mechanical bearings to support the rotor. However, due to structural limitations, these bearings are prone to friction and wear, resulting in increased motor vibration and noise, as well as increased heat generation. Furthermore, mechanical bearings limit the motor's speed range. At high speeds, the mechanical bearings are affected by centrifugal and inertial forces, exacerbating rotor vibration and limiting the motor's speed range. Therefore, traditional outer rotor motors have limitations in applications with high speed and noise requirements. Utility Model Content

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a high-speed, low-noise magnetic levitation outer rotor motor for a centrifugal fan, the purpose of which is to solve the technical problems of vibration and noise caused by friction between the mechanical bearings and the rotor by replacing the mechanical bearings inside the outer rotor motor with magnetic levitation bearings.

[0005] To achieve the above-mentioned object, according to one aspect of the present invention, a high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan is provided, comprising: a housing, a motor outer rotor, a motor stator, and a magnetic suspension bearing assembly;

[0006] The motor stator is arranged inside the motor outer rotor; the housing includes bearing seats arranged opposite to each other, and both ends of the motor outer rotor are installed in the bearing seats;

[0007] The magnetic levitation bearing assembly includes an axial magnetic levitation bearing and a radial magnetic levitation bearing; the radial magnetic levitation bearing is installed in the bearing seat and is sleeved on both ends of the outer rotor of the motor; the axial magnetic levitation bearing is installed in the bearing seat on one side of the casing and is located on the side of the radial magnetic levitation bearing close to the motor stator; the axial magnetic levitation bearing is sleeved on the outer rotor of the motor; both the axial magnetic levitation bearing and the radial magnetic levitation bearing do not contact the outer rotor of the motor.

[0008] Preferably, the axial magnetic bearing comprises two axial magnetic bearing stators arranged in parallel.

[0009] Preferably, a thrust plate is provided between the two axial magnetic bearing stators.

[0010] Preferably, the radial magnetic bearing comprises a radial magnetic bearing stator and a radial magnetic bearing rotor, the radial magnetic bearing stator is sleeved on the radial magnetic bearing rotor, and the radial magnetic bearing rotor is sleeved on the outer rotor of the motor.

[0011] Preferably, it further comprises an impeller, which is fixedly arranged on the surface of the outer rotor of the motor.

[0012] Preferably, there are two impellers, which are symmetrically arranged on the surface of the outer rotor of the motor.

[0013] Preferably, a protective bearing is further included, which is arranged in the bearing seat and sleeved on the surface of the outer rotor of the motor.

[0014] Preferably, two protective bearings are provided, and the two protective bearings are respectively installed in bearing seats arranged opposite to each other.

[0015] In general, compared with the prior art, the above technical solution conceived by the present invention solves the vibration and noise caused by the friction between the mechanical bearing and the rotor by replacing the mechanical bearing inside the outer rotor motor with a magnetic bearing, realizes contactless and frictionless support of the rotor, increases the motor speed, and reduces the vibration and noise of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan.

[0017] In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein: 1- housing; 2- motor outer rotor; 3- motor stator; 4- axial magnetic bearing; 41- axial magnetic bearing stator; 5- radial magnetic bearing; 51- radial magnetic bearing stator; 52- radial magnetic bearing rotor; 6- thrust plate; 7- impeller; 8- protective bearing. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0019] like Figure 1 As shown, the utility model proposes a high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan, which includes a housing 1, a motor outer rotor 2, a motor stator 3, a magnetic suspension bearing assembly, an impeller 7 and a protective bearing 8.

[0020] Specifically, the magnetic bearing assembly includes an axial magnetic bearing 4 and a radial magnetic bearing 5 . The axial magnetic bearing 4 provides axial support for the motor outer rotor 2 , and the radial magnetic bearing 5 provides radial support for the motor outer rotor 2 .

[0021] To further illustrate, one axial magnetic bearing 4 is provided, which is disposed within the bearing housing and located inside the radial magnetic bearing 5. The axial magnetic bearing 4 includes parallel axial magnetic bearing stators 41, with a gap between the two magnetic bearing stators 41. A thrust plate 6 is disposed within the gap. The thrust plate 6 and the magnetic bearing stator 51 are combined to control the axial displacement of the motor's outer rotor 2.

[0022] To further illustrate, two radial magnetic bearings 5 are provided, and the two radial magnetic bearings 5 are symmetrically arranged in the bearing seat. The radial magnetic bearings 5 include a radial magnetic bearing stator 51 and a radial magnetic bearing rotor 52. The radial magnetic bearing stator 51 is sleeved outside the radial magnetic bearing rotor 52.

[0023] In the embodiment of the present utility model, Figure 1As shown, a radial magnetic bearing is arranged at the front and rear of the motor to provide support for the motor outer rotor 2, and the axial magnetic bearing is arranged on the left side of the radial magnetic bearing at the right end to provide axial support for the motor outer rotor 2. The impeller 7 is fixed to the surface of the motor outer rotor 2, and the magnetic outer rotor motor and the impeller are both located inside the volute. Such a layout can make full use of the space inside the volute, making the overall layout more compact and improving space utilization. The utility model adopts two radial magnetic bearings and one axial magnetic bearing to suspend and support the motor outer rotor through electromagnetic force, avoiding the friction and wear of traditional bearings. Such a design reduces mechanical loss and improves energy utilization efficiency. The characteristics of the magnetic bearing's non-contact and frictionless support of the rotor can effectively suppress rotor vibration and noise, increase motor speed, and enhance the reliability and life of the equipment.

[0024] It will be easily understood by those skilled in the art that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan, characterized in that: include: A housing (1), a motor outer rotor (2), a motor stator (3) and a magnetic bearing assembly; The motor stator (3) is arranged inside the motor outer rotor (2); the housing (1) includes bearing seats arranged opposite to each other, and both ends of the motor outer rotor (2) are installed in the bearing seats; The magnetic suspension bearing assembly comprises an axial magnetic suspension bearing (4) and a radial magnetic suspension bearing (5); the radial magnetic suspension bearing (5) is installed in the bearing seat and sleeved on both ends of the motor outer rotor (2); the axial magnetic suspension bearing (4) is installed in the bearing seat on one side of the housing (1) and is located on the side of the radial magnetic suspension bearing (5) close to the motor stator (3); the axial magnetic suspension bearing (4) is sleeved on the motor outer rotor (2); and both the axial magnetic suspension bearing (4) and the radial magnetic suspension bearing (5) do not contact the motor outer rotor (2).

2. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 1, characterized in that: The axial magnetic suspension bearing (4) comprises two axial magnetic suspension bearing stators (41) arranged in parallel.

3. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 2, characterized in that: A thrust plate (6) is provided between the two axial magnetic suspension bearing stators (41).

4. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 1, characterized in that: The radial magnetic suspension bearing (5) comprises a radial magnetic suspension bearing stator (51) and a radial magnetic suspension bearing rotor (52); the radial magnetic suspension bearing stator (51) is sleeved on the radial magnetic suspension bearing rotor (52); and the radial magnetic suspension bearing rotor (52) is sleeved on the motor outer rotor (2).

5. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 1, characterized in that: It also includes an impeller (7), which is fixedly arranged on the surface of the motor outer rotor (2).

6. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 5, characterized in that: There are two impellers (7), and the two impellers (7) are symmetrically arranged on the surface of the motor outer rotor (2).

7. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 1, characterized in that: It also includes a protective bearing (8), which is arranged in the bearing seat and sleeved on the surface of the motor outer rotor (2).

8. The high-speed, low-noise magnetic suspension outer rotor motor for a centrifugal fan according to claim 7, characterized in that: There are two protective bearings (8), and the two protective bearings (8) are respectively installed in bearing seats that are arranged opposite to each other.

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