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A cooling device for reducing the temperature of permanent magnets in permanent magnet motors

A permanent magnet motor and cooling device technology, applied in cooling/ventilation devices, electromechanical devices, electrical components, etc., can solve problems such as poor heat dissipation conditions, loss of driving ability, high power density of permanent magnet motors, etc., to reduce temperature and improve cooling efficiency effect

Active Publication Date: 2019-02-19
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Permanent magnet motors, especially solid rotor permanent magnet motors, have a large number of harmonics in the air gap magnetic field during operation, and a large amount of eddy current loss will be generated in the rotor permanent magnets. At the same time, the power density of permanent magnet motors is high and the motor is small in size , the heat dissipation conditions are relatively poor, and the ambient temperature changes greatly, so that there is a risk of irreversible demagnetization of the permanent magnets in the motor, resulting in a decrease in the performance of the permanent magnet motor, or even a complete loss of drive capability

Method used

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  • A cooling device for reducing the temperature of permanent magnets in permanent magnet motors
  • A cooling device for reducing the temperature of permanent magnets in permanent magnet motors
  • A cooling device for reducing the temperature of permanent magnets in permanent magnet motors

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...

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Abstract

A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor. The device comprises a motor stator, a motor rotor, and a rotating shaft (13). The motor stator comprises a stator core (1), a stator winding (2), stator axial ventilation grooves (3), and a stator radial ventilation groove (4). The motor rotor comprises a rotor core (6), a rotor radial ventilation groove (12), starting cage bars (7), permanent magnet steels (8), a magnetic isolating ring (9), photo-frame-type derivative slot wedges (10), and slot wedge axial ventilation holes (11). The stator core (1) is axially provided with the stator radial ventilation groove (4), and is provided with the stator axial ventilation grooves (3) along the circumference. The rotor core (6) is axially provided with the rotor radial ventilation groove (12). The photo-frame-type derivative slot wedges (10) are provided with the slot wedge axial ventilation holes (11). The rotating shaft (13) is provided with an axial-flow fan (14). Under the action of an axial-flow fan (14) or a centrifugal fan, a photo-frame-type derivative cooling structure for reducing the temperature of a permanent magnet in a permanent magnet motor can effectively reduce the temperatures of a stator core and a rotor core, and in particular, the temperature of the permanent magnet in a rotor, thereby improving the cooling efficiency of the motor.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a cooling device for reducing the temperature of permanent magnets in permanent magnet motors. Background technique [0002] Permanent magnet motors, especially solid rotor permanent magnet motors, have a large number of harmonics in the air gap magnetic field during operation, and a large amount of eddy current loss will be generated in the rotor permanent magnets. At the same time, the power density of permanent magnet motors is high and the motor is small in size , the heat dissipation conditions are relatively poor, and the ambient temperature changes greatly, so that there is a risk of irreversible demagnetization of the permanent magnets in the motor, resulting in a decrease in the performance of the permanent magnet motor, or even a complete loss of drive capability. [0003] Therefore, how to effectively suppress the temperature of the motor and reduce the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/20H02K1/32H02K9/06
CPCH02K1/20H02K1/32H02K9/06
Inventor 李伟力曹钊滨李金阳李栋张晓晨曹君慈沈稼丰程鹏
Owner BEIJING JIAOTONG UNIV
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