A permanent magnet synchronous motor and its control method

Abstract

The present invention involves the field of motor technology, especially a permanent magnet synchronous motor and its control method. The front cover and the rear end cover are set up on one side of the across cavity.The bottom of the bottom of the milling slot runs through the middle of the internal arc structure, and other parts of the bottom of the milling slot form the installation surface; the temperature tablet is a shape memory alloy structure, one end is fixed for the installation surface, and the other end is the free end. At the normal temperature, the penetrating position is performed.Cover, the temperature starts through the deformation when the temperature exceeds the set value.In the present invention, through the setting of temperature -sensitive films, a closed motor can be opened through the deformation of the shape memory alloy when the temperature exceeds the set value, and this open behavior will end naturally after the temperature drops.Need any additional control device and electronic components, which is a more convenient optimization solution to solve high temperature heat dissipation, and can reduce the impact of the surrounding environment on the motor under normal circumstances.

Description

technical field [0001] The invention relates to the technical field of electric motors, in particular to a permanent magnet synchronous motor and a control method thereof. Background technique [0002] The self-fan cooling type of permanent magnet synchronous motor is divided into internal self-cooling type and external self-cooling type according to the fan condition. The internal self-cooling type is suitable for open-type motors. An internal fan is installed on the rotating shaft inside the end cover. The fan rotates with the rotor to blow the external cooling air into the machine, and blows the armature surface to pass through the axial and radial ventilation slots. The external self-cooling type is suitable for closed motors. In addition to the internal fan, the motor is equipped with an external fan on one end of the outer shaft of the end cover. With the help of the external fan, the heat on the casing is dissipated into the surrounding air. At this time, the internal...

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Problems solved by technology

[0003] In the above classification, the open type and the closed type of the motor are absolutely distinguished, and in the actual application process, the open type motor will inevitably cause the internal structure of the motor to be affected by the external environment to a large extent due to the setting of the ventilation slots. The impact of the closed motor will also be due to the relatively closed state, which makes it difficult to improve the heat dissipation efficiency, especially in the case of rapid temperature rise, it is difficult to obtain a quick response to abnormal conditions

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