Directly driven brushless permanent-magnet motor with external rotor for washer

Abstract

A directly driven brushless permanent-magnet motor with external rotor for the washes of composed of internal stator with windings in the slots on stator yoke and the concave external rotor with shaft hole on its end face and permanent magnets fixed on its inner wall. Its advantages are simple structure, high output power and reliability, low cost, stepless speed regulation, and low noise.

Description

technical field [0001] The invention relates to a motor for a washing machine. Background technique [0002] At present, the washing machines on the market are mainly two types of structures, the pulsator type and the drum type. The drum type washing machine has the characteristics of no entanglement of clothes, low wear rate, high cleaning degree, and wide washing range, but the body is heavy, bulky, and expensive. Expensive, the key components of the washing machines of the two structures are the drive motors, they all use traditional "single-phase induction motors", and drive the washing drum through gears, belts and other reduction mechanisms for variable speed drive, some products drive motor speed is Constant, the speed is adjusted by a complex speed change mechanism to meet the dual functions of low-speed washing and high-speed dehydration. Although some products also use frequency conversion technology to adjust the speed, because the driv...

AI Technical Summary

Problems solved by technology

[0002] At present, the washing machines on the market are mainly two types of structures, the pulsator type and the drum type. The drum type washing machine has the characteristics of no entanglement of clothes, low wear rate, high cleaning degree, and wide washing range, but the body is heavy, bulky, and expensive. Expensive, the key components of the washing machines of the two structures are the drive motors, they all use traditional "single-phase induction motors", and drive the washing drum through gears, belts and other reduction mechanisms for variable speed drive, some products drive motor speed is Constant, the speed is adjusted by a complex speed change mechanism to meet the dual functions of low-speed washing and high-speed dehydration. Although some products also use frequency conversion technology to adjust the speed, because the driving motor is a single-phase induction motor, one side of the washing machine cabinet The washing drum is placed, and the other side is a high-speed single-phase induction motor, which is connected to the central axis of the washing drum through gears and belts. Narrow range, poor reliability performance

[0003] figure 1 It is a schematic diagram of the transmission mechanism of a traditional drum washing machine. Its structure is relatively complicated. A large pulley is installed at one end of the shaft, and a small pulley is coaxial with the single-phase induction motor, which drives the transmission V-belt for deceleration transmission. The driving motor is usually a two-speed motor. When washing and rinsing, the motor runs at a low speed, and the drum rotates at 50-70 rpm. During dehydration, the motor runs at a high speed, and the drum rotates at 350-750 rpm. The motor can only rotate at two speeds. Stepless speed regulation, let alone directly drive the washing drum

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