Permanent magnet motor rotor beneficial for radiating
A technology for permanent magnet motors and rotors, which is applied to the rotating parts of the magnetic circuit, the shape/style/structure of the magnetic circuit, etc. It can solve the problems that the heat cannot be taken away in time and the permanent magnet is easy to demagnetize, so as to improve the service life and average The effect of temperature reduction and temperature rise reduction
Active Publication Date: 2012-11-28
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0003] The invention aims to solve the problem that the heat generated by the eddy current loss on the surface of the existing solid rotor of the motor cannot be taken away in time, resulting in excessive temperature of the rotor and easy demagnetization of the permanent magnet, and provides a permanent magnet motor rotor that is good for heat dissipation , the structure is also applicable to other solid rotor synchronous motors or solid rotor asynchronous motors
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[0019] The present invention provides a permanent magnet motor rotor that facilitates heat dissipation. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] Such as figure 1 and figure 2 As shown, a centrifugal fan 4 is arranged at one end of the rotor of the permanent magnet motor, and a plurality of rectangular axial ventilation slots 1 are evenly arranged in the circumferential direction of the rotor, and the distance between the rectangular axial ventilation slots 1 and the rotor surface is , where ω is the oscillation frequency of the electromagnetic wave, μ is the magnetic permeability of the material, and σ is the electrical conductivity of the material, and 2mm is selected in this embodiment. The height of the rectangular axial ventilation slot 1 is 1 / 4 to 1 / 3 of the distance from the outer circle of the rotor to the shaft, and the width is 1 / 4 to 1 / 3 of τ; where, τ is the pole pitch...
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The invention belongs to the field of a motor, and particularly relates to a permanent magnet motor rotor which is beneficial for radiating. The permanent magnet motor rotor is structurally characterized in that a plurality of rectangular axial air ventilating slots are arranged on a solid rotor and are embedded with diagonal steel supports, the center parts of the diagonal steel supports are provided with axial sealing circular tubes, the circular tubes are downwards inclined to certain degrees along an axial fan end to a non-fan end, and the circular tubes are internally provided with cooling agents. The cooling agents in the circular tubes can flow from the non-fan end to the fan end after the circular tubes are heated, heat can be taken to the fan end, the cooling agents can flow back to the non-fan end along the circular tubes after being cooled by a fan, an axial air ventilating air way can be formed in the air ventilating slots which are axially communicated by a centrifugal fan, thus the temperature of a rotor can be effectively reduced, and the service life of a permanent magnet can be increased.
Description
technical field [0001] The invention belongs to the field of motors, in particular to a permanent magnet motor rotor which is good for heat dissipation. Background technique [0002] In the existing solid rotor permanent magnet motor, the eddy current loss of the rotor caused by the time harmonic of the stator current, the space harmonic of the stator magnetomotive force, and the air gap permeance change caused by the opening of the stator slot causes the surface of the solid rotor to be heated. These heats will cause the temperature rise of the rotor to be too high, which will reduce the performance of the permanent magnet, and even cause irreversible demagnetization of the permanent magnet. The reduction of the performance of the permanent magnet means the reduction of the performance of the motor, and once the permanent magnet is demagnetized, it is impossible to re-magnetize the permanent magnet. In order to solve the above problems, the present invention provides a mot...
Claims
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IPC IPC(8): H02K1/32
Inventor 李伟力张晓晨张奕黄曹君慈陈辰
Owner BEIJING JIAOTONG UNIV