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Audible noise elimination method of magnetic shoe used for direct-current motor

A DC motor and noise elimination technology, applied in the manufacture of stator/rotor bodies, etc., can solve problems such as deviation and complexity, and achieve the effect of not easily missing edges and slag, improving magnetic distribution waveform, and improving quality characteristics

Inactive Publication Date: 2013-04-24
南通万宝磁石制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the magnetic circuit design theory, it may be feasible in theory to calculate the magnetic flux distribution of each motor magnet, but it is also very complicated, and the calculated results will have a large deviation from the actual one. A better way is simulation and experimentation to determine these values ​​and dimensions in practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Semi-finished magnet processing: The permanent magnet ferrite tile-shaped magnet used for DC motors is wet-milled to a permanent magnet ferrite material of about 0.5U, and then the inner arc radial orientation and pumping conditions are passed through the press and the tile-shaped mold Down pressed to a density of 3.0g / cm 3 The tile-shaped magnet is sintered by heating and cooling at 1200°C to become a semi-finished magnet;

[0018] Magnetic tile grinding process: Grind the surface of the semi-finished magnet—grind the edge—grind the width—grind the length—roughly grind the outer arc—roughly grind the inner arc—finish the outer arc—finish the inner arc—chamfer to form a tile-shaped magnet. The line is symmetrical, and a central angle is made according to 75% of the central angle of the tile-shaped magnet. The inner arc of the tile-shaped magnet is set at 100° from the center line, and a 90° right angle is made to both sides. The inner arc of the tile-shaped magnet is tw...

Embodiment 2

[0020] A method for eliminating audible noise of magnetic tiles for DC motors, comprising the following steps:

[0021] Semi-finished magnet processing: The permanent magnet ferrite tile-shaped magnet used for DC motors is wet-milled to a permanent magnet ferrite material of about 2u, and then passed through a press and a tile-shaped mold under the conditions of inner arc radial orientation and pumping Pressed to a density of 3.2g / cm 3 The tile-shaped magnet is sintered by heating and cooling at 1250°C to become a semi-finished magnet;

[0022] Magnetic tile grinding process: Grinding the surface of the semi-finished magnet - beating the edge - grinding the width - grinding the length - rough grinding the outer arc - rough grinding the inner arc - fine grinding the outer arc - fine grinding the inner arc - chamfering to form a tile-shaped magnet, tile-shaped The magnet is symmetrical to the center line, and a central angle is made according to 85% of the central angle of the ...

Embodiment 3

[0025] A method for eliminating audible noise of magnetic tiles for DC motors, comprising the following steps:

[0026] Semi-finished magnet processing: The permanent magnet ferrite tile-shaped magnet used for DC motors is wet-milled to a permanent magnet ferrite material of about 1u, and then passed through a press and a tile-shaped mold under the conditions of inner arc radial orientation and pumping Pressed to a density of 3g / cm 3 The tile-shaped magnet is sintered by heating and cooling at 1250°C to become a semi-finished magnet;

[0027] Magnetic tile grinding process: Grinding the surface of the semi-finished magnet - beating the edge - grinding the width - grinding the length - rough grinding the outer arc - rough grinding the inner arc - fine grinding the outer arc - fine grinding the inner arc - chamfering to form a tile-shaped magnet, tile-shaped The magnet is symmetrical to the center line, and a central angle is made according to the ratio of 75~85% of the central...

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Abstract

The invention discloses an audible noise elimination method of a magnetic shoe used for a direct-current motor. The method includes: a permanent magnetic ferrite tegular magnet used for the direct-current motor is ball-milled into a permanent magnetic ferrite material withsurface roughness of 0.5-2 micrometers through a wet process, pressed into a tegular magnet with the density of 3.0-3.2g / cm<3> through a press and a tegular mould under the conditions of inner arc radial orientation and water pumping, and made into a semi-finished magnet through sintering with rise and drop of temperature of 1200-1250 DEG C; and the process of magnetic shoe grinding is carried out, namely the semi-finished magnet undergoes the following steps: surface grinding, edge roughening, width grinding, length grinding, outer arc coarse grinding, inner arc coarse grinding, outer arc accurate grinding, inner arc accurate grinding and chamfering, and a tegular magnet is formed. Compared with a conventional grinding wheel, a grinding wheel manufactured by using the method of the magnetic shoe used for the direct-current motor is durable in use and easy to realize, the phenomena of edge missing and residue dropping do not happen easily, and use of the magnet can not be affected.

Description

technical field [0001] The invention relates to a method for eliminating noise of magnetic function products, in particular to a method for eliminating audible noise caused by stator tile-shaped magnets in a DC motor. Background technique [0002] High-performance permanent magnet ferrite is widely used in DC motors, and these motors are widely used in automobiles, motorcycles, computers, communication engineering, household appliances, office facilities, etc., and DC motors used in communication facilities, household appliances and office facilities Motors, people always hope that the motors will be as calm as water and have no audible noise during operation. People will experience the feeling of modern technology simulation. [0003] However, with the development of the automobile industry, the development of computers, and the need for automatic control of household appliances, the demand for various DC motors such as starter motors, generators, automatic brake motors, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/03
Inventor 周连明
Owner 南通万宝磁石制造有限公司
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