Permanent magnet brushless motor comprising rotor with dustproof structure

Abstract

The invention discloses a permanent magnet brushless motor comprising a rotor with a dustproof structure, comprising a housing (3), a stator, a permanent magnet rotor (4), a rotor shaft (5), a cooling fan (14), and an end cap (17). The housing (3) is provided with an air inlet (8) and an air inlet (15). The stator includes a stator core (1) and an electromagnetic winding (2). The air inlet (8) side of the housing (3) is provided with a dust cover (7), and the dust cover (7) faces the end face of the stator core (1). The stator core (1) is provided with an isolating slot wedge (10) matched with openings of electromagnetic winding slots (11), and the isolating slot wedge (10) is made of insulating material. The isolating slot wedge (10) and the dust cover (7) are mutually sheathed, and the isolating slot wedge (10) and the teeth of all the electromagnetic winding slots (11) constitute a closed stator inner circle. By adopting the structure, the permanent magnet brushless motor of the invention has the advantages of simple and reasonable structure, convenient installation, good sealing performance of the rotor, capability of avoiding iron powder and iron filings adsorption on the surface of the permanent magnet rotor (4), long service life, and the like.

Description

technical field [0001] The invention relates to a permanent magnet brushless motor used in electric tools, garden tools, household appliances, etc., especially a permanent magnet brushless motor with a dustproof structure on the rotor. Background technique [0002] Permanent magnet brushless motors are an indispensable and important part of power tools, garden tools and household appliances. The existing permanent magnet brushless motor: generally consists of a permanent magnet rotor and a stator core wound with an electromagnetic winding, and uses two bearings and an end cover to install the permanent magnet rotor and stator in the housing to form a permanent magnet brushless motor . In order to cool the electromagnetic winding, there are generally air inlets and outlets at the two ends of the shell, and a cooling fan is installed on the rotor shaft at the air outlet end, and the rotation of the motor can drive the cooling fan to rotate to form a flowing air flow. Solenoi...

AI Technical Summary

Problems solved by technology

Since the permanent magnet brushless motor is equipped with an air inlet and an air outlet, various dust and impurities in the environment can easily enter the permanent magnet brushless motor, especially after iron dust and iron chips enter the motor, due to the magnetic , Iron powder and iron chips will be adsorbed on the surface of the rotor for a long time. Over time, the iron powder and iron chips will fill the air gap between the stator and the rotor, making it difficult for the permanent magnet rotor to rotate, and the electromagnetic winding is damaged or burned. Cause permanent magnet brushless motor to be scrapped

In response to the above problems, many manufacturers and people of insight have carried out development and research, but no satisfactory products have come out on the market so far.

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