Abstract: Disclosed is a harmonic magnetic field driving electric motor comprising several tooth slots arranged on a stator lamination, a circumferential mechanical space of a stator, stator winding divided into phases according to a connection rule, and a stator assembly having a direct current that is introduced into windings of any phase, wherein the number of pole pairs, the number of wire packs, the arrangement of rotor magnetic steel, the number of formed pole pairs and electric motor air gap are balanced and optimized for superior performance using double-layer windings.

Abstract: A harmonic magnetic field driving electric motor, comprising: A. a stator lamination being provided with a plurality of tooth slots, Z; B. in a 360° mechanical space of the circumference of a stator, a stator winding being divided into m phases according to a set connection rule; C. a stator assembly having the winding being independently placed in a free space; D. wire packets contained in each phase of winding; E. permanent magnet rotor magnetic steel sequentially arranged in a circumferential direction according to the N-pole and S-pole sequence; F. in the 360° mechanical spaces of the circumferences of the stator and the rotor, an electric motor air gap in a combined space.

Abstract: A permanent magnet electric motor having reduced cogging torque ripple, comprising a stator component, permanent magnets and a rotor component, wherein the rotor component is mounted in the center of the stator component, and an air gap is formed between an outer circumferential surface of the rotor component and an inner cambered surface of the stator component. Each permanent magnet has a cross-section of an isosceles trapezoid, and the magnetic lines of the permanent magnet are symmetric relative to the center line of the magnet and orthogonal to the trapezoid faces. According to the present disclosure, by means of changing the shape of the permanent magnet, the cogging torque ripple of the permanent magnet electric motor can be reduced in order to reduce the vibration and noise caused by the cogging torque ripple and the fluctuation in speed, so that the permanent magnet electric motor runs stably.

Abstract: The present disclosure provides a device control method and apparatus. The device control method includes: connecting to a current LAN and searching a device in the LAN; determining whether there is a created device management group corresponding to the device or more, wherein the device management group corresponds to one or more devices; when there is a created device management group, determining whether there is an account bound to the device management group; and when there is no account bound to the device management group, binding a current account of a user to the device management group, thereby obtaining control of the device corresponding to the device management group according to a binding relationship between the current account of the user and the device management group.

Abstract: The present disclosure provides a device control method and apparatus. The device control method includes: connecting to a current LAN and searching a device in the LAN; determining whether there is a created device management group corresponding to the device or more, wherein the device management group corresponds to one or more devices; when there is a created device management group, determining whether there is an account bound to the device management group; and when there is no account bound to the device management group, binding a current account of a user to the device management group, thereby obtaining control of the device corresponding to the device management group according to a binding relationship between the current account of the user and the device management group.