Rotor assembly, motor and household electrical appliance

Abstract

The invention discloses a rotor assembly, a motor and a household electrical appliance, the rotor assembly comprises a shaft sleeve, a plurality of reinforcing bosses, a plurality of rotor cores and a plurality of permanent magnets, the shaft sleeve is made of a non-magnetic material, the plurality of reinforcing bosses are arranged at intervals along the circumferential direction of the shaft sleeve, and the plurality of rotor cores are arranged at intervals in the circumferential direction of the shaft sleeve. The plurality of rotor cores are arranged at intervals in the circumferential direction of the shaft sleeve, a mounting groove is formed between every two adjacent rotor cores, each rotor core comprises a protruding part, the protruding parts are connected with the shaft sleeve, a spacing distance is formed between any two protruding parts, the permanent magnets are arranged in the mounting grooves, and the permanent magnets are arranged in the mounting grooves. The plurality of permanent magnets and the plurality of rotor cores are sequentially and alternately arranged in the circumferential direction of the shaft sleeve. According to the rotor assembly provided by the embodiment of the invention, the magnetic circuit magnetic flux flowing through the rotor iron core and the shaft sleeve is effectively limited, so that the magnetic leakage phenomenon of the end part of the rotor is effectively reduced, the motor power density is improved, and the motor cost is reduced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a rotor assembly, a motor and household appliances. Background technique [0002] In the related art, the built-in rotor core is usually made of one-piece stamping of magnetically conductive material, and a large part of the magnetic flux generated by the permanent magnet passes through the fan-shaped part of the rotor core, and passes through the connecting part and the rotor sleeve part (the protrusion part and the rotor sleeve part). The shaft sleeve is integrated as a whole) for circulation, this part of the magnetic flux basically does not generate energy exchange for the motor, does not generate electromagnetic torque, resulting in a large end magnetic flux leakage phenomenon, resulting in low motor power density and high motor cost; The rotor connection part is omitted and the rotor core assembly and the rotor sleeve are integrally formed by injection molding, which can eff...

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Problems solved by technology

[0002] In the related art, the built-in rotor core is usually made of one-piece stamping of magnetically conductive material, and a large part of the magnetic flux generated by the permanent magnet passes through the fan-shaped part of the rotor core, and passes through the connecting part and the rotor sleeve part (the protrusion part and the rotor sleeve part). The shaft sleeve is integrated as a whole) for circulation, this part of the magnetic flux basically does not generate energy exchange for the motor, does not generate electromagnetic torque, resulting in a large end magnetic flux leakage phenomenon, resulting in low motor power density and high motor cost; The rotor connection part is omitted and the rotor core assembly and the rotor sleeve are integrally formed by injection molding, which can effectively reduce the magnetic flux leakage here, but the structural strength is weak, and it is not suitable for operating conditions with large torque or high speed. Motor applications are limited

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