Permanent magnetic motor and bladeless fan with same

Abstract

The invention relates to a permanent magnetic motor. The permanent magnetic motor comprises a stator and a rotor arranged inside the stator. The stator comprises a stator core provided with 12 stator teeth and a coil wound on the stator teeth, and the rotor comprises a rotating shaft and at least one magnetic core set which is fixed on the rotating shaft. The magnetic core set comprises 8 rotor cores and 8 permanent magnets, wherein the 8 rotor cores are arranged at intervals in the circumferential direction of the rotor, each permanent magnet is made of ferrite materials, each permanent magnet is clamped between two adjacent rotor cores, each permanent magnet is polarized in the circumferential direction of the rotor, and the polarities of every two adjacent permanent magnets are opposite. According to the permanent magnetic motor, a multi-polarity embedded magnetic focusing structure is applied, so that the gap flux density of the motor is improved, the objective that a high power density and a high torque density are obtained through the ferrite materials is realized, and the objective that the torque density of the ferrite motor is equal to or approximates that of a surface-attached rare-earth permanent magnet motor is realized. In addition, the permanent magnetic motor is low in noise and meets design requirements. The invention further provides a bladeless fan with the permanent magnetic motor.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a permanent magnet motor used in a bladeless fan. Background technique [0002] The motor used in the bladeless fan (such as Dyson Fan) pursues small size, light weight, and high output power, that is, high power density and high torque density. In order to achieve this purpose, the existing bladeless fan generally adopts a surface-mounted (magnet is attached to the outer surface of the rotor core) rare earth permanent magnet motor. However, as the price of rare earth materials soars, the cost of the motor is unacceptable. At the same time, the motor used in the bladeless fan also pursues low noise. An existing rare earth permanent magnet motor adopts a design of 4 poles and 6 slots, and the mute effect is not satisfactory. How to maintain the performance of the motor and reduce the noise of the motor while reducing the price has gradually become a problem that people pay attention t...

AI Technical Summary

Problems solved by technology

However, with the straight-up price of rare earth materials, the cost of the motor is unacceptable

At the same time, the motor used in the bladeless fan also pursues low noise. An existing rare earth permanent magnet motor adopts a design of 4 poles and 6 slots, and the mute effect is not satisfactory.

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