Motor shaft with insulating ceramic and preparation method thereof

Abstract

The invention discloses a motor shaft with an insulating ceramic, which comprises a shaft body, an annular groove is formed in the outer ring of the shaft body, and an annular insulating ceramic layerwith the thickness of 0.012-0.015 mm is covered in the groove. The invention discloses a preparation method of the motor shaft with the insulating ceramic, which comprises the following steps: ball-milling and mixing alumina powder, composite basalt fiber, zirconium dioxide, cerium dioxide, polyvinyl butyral, a flexibilizer, a densifier, a refiner and a tackifier until the particle size is less than or equal to 0.1 mu m, and drying at 105-112 DEG C to obtain a premix; derusting and descaling the surface of a shaft body through a grinding wheel to be smooth and clean, then polishing the shaftbody through abrasive paper, removing greasy dirt with acetone, pickling with hydrochloric acid, washing with ethanol, and drying to obtain a pretreated shaft body; and electroplating the premix to the surface of the pretreated shaft body, accurately grinding until the coating thickness is 0.012-0.015 mm, and polishing to obtain the motor shaft with the insulating ceramic.

Description

technical field

[0001] The invention relates to the technical field of motor shafts, in particular to a motor shaft with insulating ceramics and a preparation method thereof. Background technique

[0002] Bearings are very important components in motors and are extremely vulnerable to damage. Bearing damage generally has three types: thermal damage, force damage and electrical damage, among which electrical damage is the main one. Due to the existence of the common mode voltage generated in the motor, the shaft voltage will be generated on the motor shaft. When the shaft voltage breaks through the lubricating oil film, a large shaft current will be generated at the moment. The path of the shaft current is transmitted from the motor shaft through the bearing to the motor end cover. After grounding, a loop is formed, and the harm of the shaft current is that electric corrosion will occur on the surface of the rolling elements of the bearing, thereby destroying the bearing rac...

Examples

Embodiment 1

[0026] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.012mm;

[0027] The raw materials of the insulating ceramic layer include: 80 parts of alumina powder, 5 parts of composite basalt fiber, 6 parts of zirconia, 1 part of ceria, 2 parts of polyvinyl butyral, 5 parts of titanium oxide with a particle size of 0.15 μm, 3 parts of kaolinite with a particle size of 0.1 μm, 2 parts of magnesium oxide with a particle size of 0.1 μm, and 2 parts of ferromolybdenum powder with a particle size of 0.4 μm.

[0028] In the preparation process of composite basalt fiber, 3 parts of basalt fiber, 3 parts of graphene, and 0.2 parts of silicon carbide are mixed and ground until the particle size passes through a 100 mesh sieve, and 2 parts of silane coupling agent, 1 part of aluminum dihydrogen phosphate, 4 parts of Hydr...

Embodiment 2

[0035] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.015 mm;

[0036] The raw materials of the insulating ceramic layer include: 50 parts of alumina powder, 15 parts of composite basalt fiber, 3 parts of zirconia, 2 parts of ceria, 1 part of polyvinyl butyral, 2 parts of titanium oxide with a particle size of 0.3 μm, 1 part of kaolinite with a particle size of 0.3 μm, 1 part of magnesium oxide with a particle size of 0.2 μm, and 1 part of ferromolybdenum powder with a particle size of 0.85 μm.

[0037] In the preparation process of composite basalt fiber, 6 parts of basalt fiber, 1 part of graphene, and 0.8 parts of silicon carbide are mixed and ground until the particle size passes through a 100-mesh sieve, and 1 part of silane coupling agent, 2 parts of aluminum dihydrogen phosphate, and 2 parts of Hy...

Embodiment 3

[0044] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.013 mm;

[0045] The raw materials of the insulating ceramic layer include: 70 parts of alumina powder, 8 parts of composite basalt fiber, 5 parts of zirconia, 1.2 parts of ceria, 1.7 parts of polyvinyl butyral, 4 parts of titanium oxide with a particle size of 0.2 μm, 2.5 parts of kaolinite with a particle size of 0.15 μm, 1.8 parts of magnesium oxide with a particle size of 0.13 μm, and 1.7 parts of ferromolybdenum powder with a particle size of 0.5 μm.

[0046] In the preparation process of composite basalt fiber, 4 parts of basalt fiber, 2.5 parts of graphene, and 0.4 parts of silicon carbide are mixed and ground until the particle size passes through a 100 mesh sieve, and 1.7 parts of silane coupling agent, 1.3 parts of aluminum dihydrogen phospha...

technical field

[0001] The invention relates to the technical field of motor shafts, in particular to a motor shaft with insulating ceramics and a preparation method thereof. Background technique

[0002] Bearings are very important components in motors and are extremely vulnerable to damage. Bearing damage generally has three types: thermal damage, force damage and electrical damage, among which electrical damage is the main one. Due to the existence of the common mode voltage generated in the motor, the shaft voltage will be generated on the motor shaft. When the shaft voltage breaks through the lubricating oil film, a large shaft current will be generated at the moment. The path of the shaft current is transmitted from the motor shaft through the bearing to the motor end cover. After grounding, a loop is formed, and the harm of the shaft current is that electric corrosion will occur on the surface of the rolling elements of the bearing, thereby destroying the bearing rac...

Examples

Embodiment 1

[0026] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.012mm;

[0027] The raw materials of the insulating ceramic layer include: 80 parts of alumina powder, 5 parts of composite basalt fiber, 6 parts of zirconia, 1 part of ceria, 2 parts of polyvinyl butyral, 5 parts of titanium oxide with a particle size of 0.15 μm, 3 parts of kaolinite with a particle size of 0.1 μm, 2 parts of magnesium oxide with a particle size of 0.1 μm, and 2 parts of ferromolybdenum powder with a particle size of 0.4 μm.

[0028] In the preparation process of composite basalt fiber, 3 parts of basalt fiber, 3 parts of graphene, and 0.2 parts of silicon carbide are mixed and ground until the particle size passes through a 100 mesh sieve, and 2 parts of silane coupling agent, 1 part of aluminum dihydrogen phosphate, 4 parts of Hydr...

Embodiment 2

[0035] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.015 mm;

[0036] The raw materials of the insulating ceramic layer include: 50 parts of alumina powder, 15 parts of composite basalt fiber, 3 parts of zirconia, 2 parts of ceria, 1 part of polyvinyl butyral, 2 parts of titanium oxide with a particle size of 0.3 μm, 1 part of kaolinite with a particle size of 0.3 μm, 1 part of magnesium oxide with a particle size of 0.2 μm, and 1 part of ferromolybdenum powder with a particle size of 0.85 μm.

[0037] In the preparation process of composite basalt fiber, 6 parts of basalt fiber, 1 part of graphene, and 0.8 parts of silicon carbide are mixed and ground until the particle size passes through a 100-mesh sieve, and 1 part of silane coupling agent, 2 parts of aluminum dihydrogen phosphate, and 2 parts of Hy...

Embodiment 3

[0044] A motor shaft with insulating ceramics, comprising a shaft body, the outer ring of the shaft body is provided with an annular groove, and the groove is covered with an annular insulating ceramic layer with a thickness of 0.013 mm;

[0045] The raw materials of the insulating ceramic layer include: 70 parts of alumina powder, 8 parts of composite basalt fiber, 5 parts of zirconia, 1.2 parts of ceria, 1.7 parts of polyvinyl butyral, 4 parts of titanium oxide with a particle size of 0.2 μm, 2.5 parts of kaolinite with a particle size of 0.15 μm, 1.8 parts of magnesium oxide with a particle size of 0.13 μm, and 1.7 parts of ferromolybdenum powder with a particle size of 0.5 μm.

[0046] In the preparation process of composite basalt fiber, 4 parts of basalt fiber, 2.5 parts of graphene, and 0.4 parts of silicon carbide are mixed and ground until the particle size passes through a 100 mesh sieve, and 1.7 parts of silane coupling agent, 1.3 parts of aluminum dihydrogen phospha...