External rotor motor

Abstract

The invention discloses an external rotor motor which comprises a wheel hub, a motor shaft, an external rotor without a winding or a magnetic tile, and an internal stator with the winding, wherein both the external rotor and the internal stator are of a structure having double salient poles; end covers are assembled on two sides of the wheel hub; two ends of the motor shaft are arranged on the end covers by a bearing; the internal stator is fixedly sleeved with the motor shaft; the external rotor is in tightly cooperative connection with the wheel hub; a photoelectric board element is arranged on one side of the internal stator; and the end cover on the same side with the photoelectric board element is provided with a raster playing a switching role. The rotor is only provided with a rotor silicon steel sheet instead of the magnetic tile or the winding; the raster and the photoelectric board element are adopted for switching; both the external rotor and the internal stator are provided with bulged tooth poles which are of the structure having double salient poles; a coil is arranged on the tooth pole of the stator to supply a working magnetic field to the motor; that the rotor is not provided with the magnetic tile or the coil makes use of a minimum reluctance principle, which means that the magnetic flux is always closed along the minimum reluctance path to drive the rotor to rotate by magnetic attraction force.

Description

technical field [0001] The invention relates to a motor, in particular to an outer rotor motor with no magnetic tiles or windings on the rotor but only rotor silicon steel sheets, and adopting grating and photoelectric plate components for commutation. Background technique [0002] The motors used for electric vehicles in the existing market are mostly DC permanent magnet motors or DC permanent magnet brushless motors. Compared with the former, the latter has obvious advantages in performance, so now most electric vehicle motors are DC permanent magnet brushless motors However, the current national regulation on rare earth materials has led to an increase in the cost of magnetic tile materials used, and the price of magnetic tiles in the market has also surged in a short period of time, and after falling back, it is also higher than the previous price of magnetic tiles, so the price of applied products has also risen accordingly. It is difficult to control the cost of motors...

AI Technical Summary

Problems solved by technology

[0002] The motors used for electric vehicles in the existing market are mostly DC permanent magnet motors or DC permanent magnet brushless motors. Compared with the former, the latter has obvious advantages in performance, so now most electric vehicle motors are DC permanent magnet brushless motors However, the current national regulation on rare earth materials has led to an increase in the cost of magnetic tile materials used, and the price of magnetic tiles in the market has also surged in a short period of time, and after falling back, it is also higher than the previous price of magnetic tiles, so the price of applied products has also risen accordingly. It is difficult to control the cost of motors fundamentally, which seriously affects the production process of such motors, restricts the development of electric vehicles, and has a serious impact on environmental protection, energy saving and emission reduction

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