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Preparation method for permanent ferrite dipolar rotor

A permanent magnet ferrite and two-pole rotor technology, which is applied in the manufacture of stator/rotor body, etc., can solve the problems of unstable motor operation, large surface magnetic difference, and low retention rate of dry forming performance.

Active Publication Date: 2011-05-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low performance retention rate and easy cracking of dry forming in the prior art, the present invention provides a method for manufacturing a permanent magnet ferrite two-pole rotor with relatively high performance and not easy to crack using wet forming, so as to effectively It avoids the problem of large surface magnetic difference between the two poles of the two-pole rotor during axial magnetization and the unstable operation of the motor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The molecular formula is [Sr 1-x La x [(Fe 3+ a Fe 2+ b ) 12-y co y ]O 19 , where a+b is equal to 1; z is 0.9~1.1; a is 0.97~0.999, b is 0.001~0.03; the range of x and y is: 02 , 0.75wt% CaCO 3 , 18 hours of wet pulverization was carried out in a high-efficiency ball mill, the ratio of ball water to water was set at 1:15:1.2, and the average particle size of the pulverized slurry particles was 0.8 μm.

[0019] Dry the above slurry at a constant temperature of 130°C for 24 hours, weigh 1.6kg of block material, then add 0.8wt% ground camphor powder and 0.5wt% calcium stearate, and fully stir for 5min by a high-speed mixer, A dry-pressed magnetic powder suitable for dry-pressed molding is prepared. The moisture detection content of the dry-pressed magnetic powder is 0.8wt%.

[0020] Form the slurry under the forming hydraulic press of this device, apply a forming magnetic field of 10000Oe in the pressing direction, adopt wet forming and radial magnetization metho...

Embodiment 2

[0023] Form the slurry under the forming hydraulic press of this device, apply a forming magnetic field of 5000Oe in the pressing direction, adopt wet forming and radial magnetization methods, and make the forming direction, the direction of the magnetic field and the direction of the main axis of the two-pole rotor blank perpendicular to each other . The obtained molded body was a cylinder with a diameter of 43.2 mm and a height of 10 mm, and the molding pressure was 10 MPa. Then place the blank in a constant temperature environment of 38°C and dry for 46 hours, so that the moisture content of the blank is 1-4wt%, take it out and put it into a precision machine tool to drill a hole in the middle of the elliptical cylindrical blank, and then put it in an electric kiln at 1180°C for sintering 2 hours, wherein the oxygen partial pressure is kept not lower than 20%, the heating rate is 150°C / hour, and the temperature is naturally lowered after sintering. Finally, the outer circl...

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Abstract

The invention relates to the field of a magnetic material, in particular to a preparation method for an anisotropic multi-pole magnetic ring formed by dry-pressing. The invention belongs to a preparation method for a permanent ferrite dipolar rotor, in particular to a preparation method for the permanent ferrite dipolar rotor adopting wet-forming. The invention aims at the problems such as low performance maintenance rate, easy cracking, and the like of the dry-forming in the prior art and provides a preparation method for the permanent ferrite dipolar rotor which adopts wet-forming and has relative higher performance and is not easy to crack, thereby effectively avoiding the problems of large surface magnetic difference generated by the two poles of the dipolar rotor during coaxial magnetizing and instable working of a motor. The purpose of the invention is implemented by the following technical proposal: when the wet-forming technique of the permanent ferrite dipolar rotor is used, the forming direction, the magnetic field direction and the main shaft direction of the dipolar rotor are vertical two by two; and a blank of a pressed cylinder is stood and dried and then the preparedblank of the dipolar rotor is arranged into an electrical kiln for sintering.

Description

technical field [0001] The invention belongs to a method for manufacturing a permanent magnet ferrite two-pole rotor, in particular to a method for manufacturing a permanent magnet ferrite two-pole rotor that adopts wet forming. Background technique [0002] Permanent ferrite two-pole rotors are widely used in variable frequency air conditioner motors, stepper motors, servo motors and other fields. At present, dry pressing is mainly used in the production of two-pole rotors. The two-pole rotors produced in this way are easy to crack, and the yield is too low, which seriously restricts the industrial production of two-pole rotors. [0003] At present, the performance of the traditional two-pole rotor formed by dry pressing is about 10% lower than that of wet pressing of the same material, and the forming is easy to crack, and the yield is too low. [0004] The traditional wet forming adopts axial magnetization, that is, the direction of the magnetic field is parallel to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/02
Inventor 叶华包大新杨武国丁伯明胡良权
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD