DC brushless motor and household appliance

Abstract

The embodiment of the invention discloses a DC brushless motor and a household appliance. The DC brushless motor comprises a rotor and a rotating shaft which are electrically connected through an electrical connection structure to increase the total parasitic capacitance of the DC brushless motor. The DC brushless motor and the household appliance provided by the embodiments of the present invention can increase the total parasitic capacitance of the DC brushless motor by electrically connecting the rotor and the rotating shaft through the electrical connection structure to improve the bypasseffect of the parasitic capacitance and reduce the conducted EMI of the brushless DC motor, and when the DC brushless motor performs conduction EMI test, a magnetic ring is not required, and the conduction EMI test cost is reduced.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a DC brushless motor and a household appliance. Background technique [0002] Electromagnetic Interference (EMI for short) refers to the damage caused by unwanted signals or noise to the reception or transmission of useful electromagnetic signals. The high-frequency electromagnetic noise generated by electronic / electrical equipment can generate conducted EMI through the transmission of wires. The conducted EMI of electronic / electrical equipment can be measured through the Line Impedance Stabilization Network (LISN for short). At present, electronic / electrical equipment needs to pass relevant conducted EMI tests before being put on the market. [0003] A brushless DC motor is a typical mechatronic product, including a motor body and a driver. The main body of the motor includes components such as a stator, a rotor, and a rotating shaft. The stator is provided with th...

AI Technical Summary

Problems solved by technology

In practical applications, the use of magnetic rings to suppress conducted EMI has the following disadvantages: (1) The cost of materials is high

The commonly used closed magnetic ring is about 0.4 yuan, and the buckle magnetic ring is about 1.0 yuan, which increases the conducted EMI test cost of the brushless DC motor; The conductive EMI test cost of the brush motor; (3) The magnetic ring scheme often has a seesaw characteristic, which cannot suppress electromagnetic interference in the entire frequency band, especially when there are many frequency points where the conducted EMI exceeds the standard, the magnetic ring is difficult to completely The effect of suppressing electromagnetic interference; (4) Poor technical versatility

Due to the different interference characteristics produced by brushless DC motors with different characteristics, different batches of brushless DC motors often require different magnetic ring solutions, that is, the material, volume and number of turns of the magnetic ring need to be determined according to the requirements of the brushless DC motor. to determine, further increasing the cost of conducted EMI testing for brushless DC motors

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