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Cooled magnet motor

A technology of motors and electric motors, applied in cooling/ventilation devices, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve problems such as winding heat and increasing winding resistance

Active Publication Date: 2014-04-30
HDD SERVO MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the winding to get hotter which will increase the winding resistance causing the winding to get even hotter etc.

Method used

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  • Cooled magnet motor
  • Cooled magnet motor
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Embodiment Construction

[0043] Hereinafter, a detailed description of the present invention will be given. It will be appreciated that these figures are for illustration purposes only and do not limit the scope of the invention in any way.

[0044] figure 1 shown with the figure 2 Shown in section A-A perpendicular to the axis of the motor or generator.

[0045] figure 2 Section B-B parallel to the axis of the same permanent magnet motor / generator 201 is shown. Magnets have a very high magnetic energy product (BH product), but are limited in their ability to withstand high stator currents at high temperatures. Cooling of the magnets is performed by a flow of cooling fluid which, after entering the motor / generator, is directed to the rotor magnet channels through paths (202-208) which do not cause any substantial heating of the fluid.

[0046] The fluid follows the path indicated by the thin lines from 202 to 203 . The rotor 204 has a disk portion 205 and a hollow cylindrical portion 206 on w...

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PUM

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Abstract

An electric motor / generator comprises a rotor with magnets mounted on the surface of the rotor, the magnets facing the stator over a gap. The magnets have a very high flux density but a limited ability to withstand high stator currents at high temperatures, preferably magnets made of the N48H material. By providing rotor magnet cooling means that reduces the temperature of the magnets by a cooling fluid, use of magnets with lower maximum working temperature and higher flux density is permitted and thereby higher flux can be obtained from the magnets.

Description

technical field [0001] This invention relates to cooled electric motors and generators. Background technique [0002] Generators and electric motors with permanent magnet rotors are often cooled by a liquid in thermal contact with the stator. Most of the heat is generated in the stator iron poles, stator windings and to a lesser extent in the rotor magnets. In most cases the magnets are in the center of the motor inside the stator. The heat is mostly generated in the stator between the magnets and the cooling mantle, and the cooling takes place on the outside of the stator. Therefore the temperature of the magnet is high. [0003] The temperature of the magnets and windings affects the losses of the motor / generator in two ways. The temperature of the copper in the windings affects the resistance of the copper material, since the resistance increases with temperature. Therefore, for a given current, more heat is generated in the hotter windings. If (as is usually the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27H02K9/197
CPCH02K1/32H02K9/19H02K5/20H02K5/207H02K5/203
Inventor L.斯特里德斯伯格
Owner HDD SERVO MOTORS
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