Permanent-magnet brushless DC motor

Abstract

The invention provides a permanent magnet brushless DC motor which can improve the power of the motor conveniently and is with a hardly damaged permanent magnet. The permanent magnet brushless DC motor consists of a permanent magnet rotor, a stator, a coil or a winding, an end cover and a shell. The permanent magnet rotor consists of a permanent magnet that is sheathed on a rotating shaft and a rotor frame; the permanent magnet consists of a plurality of sections of permanent magnets. The permanent magnet brushless DC motor of the invention regulates the intensity of an effective permanent magnetic field by regulating the number of sections of the permanent magnet, thus realizing the goal of regulating the power of the motor and being convenient; besides, a permanent magnet brushless DC motor with huge power can be manufactured, with the existing power of about 6kW being improved to about 20kW; as the permanent magnet brushless DC motor of the invention adopts the permanent magnet with a plurality of sections, each section of the permanent magnet is relatively small and can not be damaged when working under the influence of centrifugal force, thus prolonging the service life of the permanent magnet.

Description

Permanent Magnet Brushless DC Motor technical field The invention relates to a generator, in particular to a permanent magnet brushless DC motor. Background technique Permanent magnet brushless DC motors have good starting performance and wide and smooth speed regulation performance, and are widely used in electrical transmissions that require frequent starting and speed regulation, such as electric locomotives, trolley buses, rolling mills, machine tools and starting equipment. The power of the brush motor is mainly adjusted by changing the stator winding structure or adjusting the effective magnetic field strength. The permanent magnets of most permanent magnet motors are made of rare earth materials. Rare earth permanent magnet materials are restricted by their own performance and application, and the magnetic field strength they provide is often very limited, which makes it difficult to increase the power of the motor; in addition, rare earth permanent magnet materia...

AI Technical Summary

Problems solved by technology

Rare earth permanent magnet materials are restricted by their own performance and application, and the magnetic field strength they provide is often very limited, which makes it difficult to increase the power of the motor; in addition, rare earth permanent magnet materials are brittle substances. When a motor equipped with rare earth permanent magnets is running, the centrifugal force Acting on the permanent magnet, the higher the speed of the permanent magnet rotor, the stronger the centrifugal force, so the rare earth permanent magnet is easy to damage

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