High-speed permanent magnet motor

Abstract

The invention relates to a high-speed permanent magnet motor. The high-speed permanent magnet motor comprises a motor shell, a rotating shaft installed in the motor shell, a rotor arranged on the rotating shaft in a sleeving mode, a stator arranged on the radial outer side of the rotor, a cooler installed on the top wall of the motor shell and a fan. The cooler is mounted at the top of the motor shell, an air inlet hole and an air outlet hole are formed in the top of the motor shell to make the inner cavity of the cooler communicated with the inner cavity of the motor shell, and ventilation air channels are formed in the rotor and the stator in the motor shell, so under the action of the fan, Heat generated by high-speed operation of the motor can be brought into the cooling cavity through the air inlet hole, the first axial air channel, the rotor radial air channel, the air gap, the stator radial air channel and the air outlet hole, heat exchange is carried out in the cooling cavity through external airflow of the heat exchange pipe, rapid cooling of the motor is achieved, and temperature rise of the motor is reduced. The cooling cavity and the motor shell inner cavity which are communicated with each other enlarge the heat dissipation space, improve the heat dissipation effect of the motor, and ensure the stable and reliable operation of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a high-speed permanent magnet motor. Background technique [0002] High-speed permanent magnet motors have the advantages of high speed, small size, high power density, and high operating efficiency. They are widely used in industrial fields such as high-speed grinding machines, energy storage flywheels, high-speed centrifugal compressors, and blowers. The high-speed permanent magnet motor is driven by a frequency conversion device and is directly connected to the load, eliminating the need for a traditional gear speed increase structure, thereby improving the efficiency of the entire transmission system. However, in the process of variable frequency drive, the excitation frequency loaded in the stator winding of the motor is relatively high, which makes the alternating frequency of the magnetic density of the stator core much higher than that of the conventional motor, which will...

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Problems solved by technology

[0003] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a high-speed permanent magnet motor to solve the problems in the prior art such as high iron consumption of the motor stator, high temperature, large vibration, poor strength of the rotor and permanent magnets, etc.

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