An external motor rotor bldc motor for a drum washing machine

Abstract

The invention discloses an outer motor rotor BLDC (brushless direct current motor) electromotor for a roller washing machine. The outer motor rotor BLDC electromotor comprises a revolving shaft the right end of which is provided with a belt pulley, the outer motor rotor BLDC electromotor is characterized by comprising first end covers, second end covers, motor stators fixedly provided with electromagnetic coils and outgoing line assemblies, motor rotors which are fixedly matched with the revolving shaft, and fixed pins which are connected and matched with a rotary drum outer barrel installing position, wherein the first end covers and the revolving shaft are supported and matched through first bearings; the second end covers and the revolving shaft are supported and matched through second bearings, the motor stators are provided with iron cores, magnetic rings and permanent magnets are arranged at the corresponding positions of the motor rotors; and the motor rotors are provided with magnetic discs, and Hall element feedback assemblies are arranged at the corresponding positions of the motor stators. Due to the adoption of the Hall element feedback assemblies, the electrodeless speed regulation of the motor is realized through the magnetic field distribution of permanent magnets of the motor rotors corresponding to the magnetic discs, and the outer motor rotor BLDC electromotor provided by the invention has the advantages that the structure is simple, the operation is reliable, and the maintenance is convenient.

Description

technical field [0001] The invention relates to components of household appliances, in particular to a BLDC motor with an external motor rotor for a drum washing machine. Background technique [0002] The motors used in my country's fully automatic drum washing machines mainly include series motors, AC induction (brushless) motors, and DC brushless motors. Among them, series excitation motors have been widely used in low and mid-range drum washing machines; AC induction (brushless) motors and direct brushless current motors are used in high-end drum washing machines. BLDC is an acronym for Brushless DC. [0003] The structure of the series motor is complex, and the motor rotor current needs to be mechanically commutated through the commutator and brushes. The sliding friction between the commutator and the brushes is prone to mechanical wear, noise, sparks, and electromagnetic interference, which makes the motor more reliable. Reduced and shortened lifespan, although with ...

AI Technical Summary

Problems solved by technology

[0006] However, due to the small output torque of this kind of internal motor rotor DC brushless motor, it needs a large reduction ratio to meet the torque demand of the washing machine, so that the motor needs to reach tens of thousands of revolutions during dehydration to meet the dehydration speed requirements.

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