A low-magnetic, low-vibration, and low-noise motor

Abstract

This invention discloses a low-magnetic, low-vibration, and low-noise motor, comprising a stator, a rotor, and a bearing assembly. The stator includes a stator housing, a terminal box, and an iron core. The iron core has 60 slots with a skewed spacing of one slot. Windings are mounted on the iron core and are encapsulated with epoxy resin to form a single unit with the iron core and stator housing. Cables are led out through the terminal box. The rotor includes a shaft, a shaft support, and a rotor yoke. Permanent magnets are fixed to the surface of the rotor yoke by pressure strips. The two end faces of the permanent magnets, as well as the shaft, shaft support, and rotor yoke, are fixed by end plates. The bearing assembly includes a bearing housing and, sequentially arranged on the bearing housing, a bearing body, a bearing cooler, a bearing bush, and an oil slinger. This invention's motor exhibits low magnetic characteristics, improving the electromagnetic radiation problem of the motor itself, significantly reducing the motor's external magnetic radiation, weakening the interference of the Earth's magnetic field and other external magnetic fields on the motor's internal magnetic field, and improving its antimagnetic capability.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a low-magnetic, low-vibration-noise motor, which is particularly suitable for ship propulsion applications requiring low magnetic radiation and low vibration-noise. Background Technology

[0002] Stealth of ships is an important direction for the development of marine equipment. Low magnetic performance and vibration and noise performance are two key indicators of stealth. Magnetic stealth and acoustic stealth are two key performance constraints on the stealth development of my country's ship propulsion equipment.

[0003] The low magnetic properties of an electric motor refer to its ability to neither radiate low-frequency magnetic fields nor resist interference from external magnetic fields such as the Earth's magnetic field when operating in special environments. Currently, there are few reported patents related to the optimized design and control of low magnetic motors, but patents and papers that simultaneously consider low magnetic properties with vibration and noise performance are extremely rare.

[0004] Low-noise design of conventional motors generally focuses on two aspects: reducing the excitation source and optimizing the vibration noise transmission path. Electromagnetic excitation force is weakened through optimization of electromagnetic parameters such as magnetic pole optimization, skewed slots, reasonable slot matching, pitch, and slot shape. Resonance is avoided by designing around the coordination of the motor's vibration and excitation force characteristics, and the transmission path is optimized to reduce the transmission of excitation source to the base.

[0005] However, the low-noise schemes optimized using the above measures often result in excessive magnetic radiation on important observation surfaces of the motor, and are easily affected by external magnetic fields such as the Earth's magnetic field, leading to poor low-magnetic performance of the motor. Summary of the Invention

[0006] The purpose of this invention is to explore new design technologies for low-magnetic, low-vibration, and low-noise motors, and to design a low-magnetic, low-vibration, and low-noise motor that satisfies both low magnetic characteristics and low vibration and noise characteristics, thus providing a reference for the subsequent design of low-magnetic, low-vibration, and low-noise motors.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: a low-magnetic, low-vibration, and low-noise motor, comprising a stator, a rotor, and a bearing assembly; the stator includes a stator housing, a terminal box made of low-magnetic material welded to the stator housing, and an iron core fixed to the inner wall of the stator housing by a heat-shrink fitting. The iron core has 60 slots with a skewed slot pitch of 1, and windings are provided on the iron core. The windings are encapsulated with epoxy resin material to form an integral whole with the iron core and the stator housing. After encapsulation, cables are led out through the terminal box; the rotor has 10 poles and includes a shaft, a shaft support, and a rotor yoke outside the shaft support. Permanent magnets are attached to the surface of the rotor yoke and are fixed to the rotor yoke by pressure strips. The two end faces of the permanent magnets, as well as the shaft, shaft support, and rotor yoke, are fixed by end pressure plates; the bearing assembly is an end-cap type self-lubricating bearing made of low-magnetic material, including a bearing housing and a bearing body, a bearing cooler, a bearing bush, and an oil slinger arranged sequentially on the bearing housing.

[0008] The aforementioned low-magnetic, low-vibration, and low-noise motor has a bearing housing made of copper alloy, a bearing cooler made of stainless steel, and an oil slinger made of aluminum alloy.

[0009] The aforementioned low-magnetic, low-vibration, and low-noise motor has its bearing shell surface material made of plastic alloy.

[0010] The aforementioned low-magnetic, low-vibration, and low-noise motor has a stator housing made of low-magnetic aluminum alloy.

[0011] The aforementioned low-magnetic, low-vibration, and low-noise motor has a shaft, shaft support, rotor yoke, and pressure bar all made of low-magnetic alloy steel.

[0012] The beneficial effects of this invention are as follows: This invention determines the size of the air gap between the stator and rotor through a reasonable stator, rotor, and bearing assembly structure, selects a 60-slot, 10-pole pole-slot combination and a double-layer lap winding configuration, and sets the stator slot skew by one slot pitch to optimize the magnetic field waveform, weaken the electromagnetic excitation force, reduce torque pulsation, and reduce motor vibration from the source; while possessing low magnetic characteristics, it also has low vibration and noise characteristics, and the dynamic balancing process of the motor rotor achieves a balance quality of G1.0, reducing the rotational frequency vibration caused by the centrifugal force of rotor rotation from the process control perspective. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the motor structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the stator housing structure of the present invention;

[0015] Figure 3 This is a side view of the rotor of the present invention;

[0016] Figure 4 This is a front view of the rotor of the present invention;

[0017] Figure 5 This is a front-view sectional view of the bearing assembly of the present invention;

[0018] Figure 6 This is a partial sectional view of the bearing assembly of the present invention from the side view direction.

[0019] The reference numerals for each figure are as follows: 1—bearing assembly, 1.0—bearing body, 1.1—bearing housing, 1.2—bearing cooler, 1.3—bearing bush, 1.4—oil slinger, 2—rotor, 2.1—end pressure plate, 2.2—shaft support, 2.3—shaft, 2.4—permanent magnet, 2.5—pressure bar, 3—stator, 3.1—stator housing, 3.2—epoxy resin, 4—terminal junction box. Detailed Implementation

[0020] The embodiments of this utility model will be further described below with reference to specific examples and accompanying drawings.

[0021] Reference Figure 1 As shown in the figure, a low-magnetic, low-vibration, and low-noise motor is disclosed as a specific embodiment of the present invention, including a stator 3, a rotor 2, and a bearing 1. The stator 3 includes a stator housing 3.1, a terminal box 4 made of low-magnetic material welded to the stator housing 3.1, and an iron core fixed to the inner wall of the stator housing 3.1 by a heat-shrink fitting. The iron core has 60 slots with a skewed slot pitch of 1. Windings are provided on the iron core. The windings are encapsulated with epoxy resin 3.2 material, which is used to encapsulate the iron core and the stator housing 3.1 into a single unit. After encapsulation, cables are led out through the terminal box 4. The stator housing 3.1 is made of low-magnetic aluminum alloy, and its structure is as follows. Figure 2 As shown.

[0022] Reference Figure 3 , Figure 4 As shown, the rotor 2 has 10 poles and includes a shaft 2.3, a shaft support 2.2, and a rotor yoke on the outer surface of the shaft support 2.2. The surface of the rotor yoke is covered with permanent magnets 2.4, which are fixed to the rotor yoke by pressure strips 2.5. The two end faces of the permanent magnets 2.4, as well as the shaft 2.3, shaft support 2.2, and rotor yoke, are fixed by end pressure plates 2.1. The rotor 2 reduces vibration noise and improves structural strength through high dynamic balance and impregnation processes. Except for the permanent magnets 2.4, the magnetic conductive structural components of the rotor 2 are made of soft magnetic materials with high magnetic permeability and low remanence. The shaft 2.3, shaft support 2.2, rotor yoke, and pressure strips 2.5 are all made of low-magnetic alloy steel.

[0023] Reference Figure 5 , Figure 6As shown, the bearing assembly 1 is an end cap type self-lubricating bearing made of low magnetic material. It includes a bearing housing 1.1 and a bearing body 1.0, a bearing cooler 1.2, a bearing bush 1.3 and an oil slinger 1.4 arranged sequentially on the bearing housing 1.1.

[0024] The structural components of bearing assembly 1 are made of low-magnetic materials, such as the bearing housing 1.1 made of copper alloy, the bearing cooler 1.2 made of stainless steel, the bearing bush 1.3 made of plastic alloy, and the oil slinger 1.4 made of aluminum alloy. This can effectively reduce the electromagnetic radiation of the motor itself and weaken the influence of external magnetic fields on the internal magnetic field of the motor.

[0025] This invention avoids the electromagnetic radiation problem of the motor itself and weakens the interference of external magnetic fields such as the Earth's magnetic field. Through comprehensive design of electromagnetic, structural and material aspects, it effectively reduces the vibration and noise of the motor, so that the two key performances of magnetic stealth and acoustic stealth of the motor reach an excellent level. At the same time, it can be used to derive other similar products, which have very high economic value and social benefits.

[0026] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A low-magnetic-vibration-noise motor, comprising a stator (3), a rotor (2), and a bearing assembly (1); characterized in that: The stator (3) includes a stator housing (3.1), a terminal box (4) welded to the stator housing (3.1), and an iron core heat-fitted to the inner wall of the stator housing (3.1). The iron core has 60 slots with a skewed slot pitch of 1. The iron core is equipped with windings, which are encapsulated with epoxy resin (3.2) to form a single unit with the iron core and the stator housing (3.1). Cables are led out through the terminal box (4). The rotor (2) has 10 poles and includes a shaft (2.3) and a shaft support (2.2). The rotor yoke outside the shaft support (2.2) and the surface of the rotor yoke is fixed with a permanent magnet (2.4) by a pressure strip (2.5). The two ends of the permanent magnet (2.4), the shaft (2.3), the shaft support (2.2) and the rotor yoke are fixed by an end pressure plate (2.1). The bearing assembly (1) includes a bearing seat (1.1) and a bearing body (1.0), a bearing cooler (1.2), a bearing bush (1.3) and an oil slinger (1.4) arranged sequentially on the bearing seat (1.1).

2. The low-magnetic-frequency, low-vibration-noise motor according to claim 1, characterized in that, The bearing housing (1.1) is made of copper alloy, the bearing cooler (1.2) is made of stainless steel, and the oil slinger (1.4) is made of aluminum alloy.

3. The low-magnetic-frequency, low-vibration-noise motor according to claim 1, characterized in that, The bearing shell (1.3) is made of plastic alloy.

4. A low-magnetic, low-vibration, and low-noise motor according to claim 1, characterized in that, The stator housing (3.1) is made of aluminum alloy.

5. A low-magnetic, low-vibration, and low-noise motor according to claim 1, characterized in that, The aforementioned rotating shaft (2.3), rotating shaft support (2.2), rotor yoke, and pressure bar (2.5) are all made of low-magnetic alloy steel.

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