Abstract:
A motor assembly includes a single phase motor and a friction clutch. The single phase motor includes a stator and a rotor. The friction clutch includes a pressing member rotating with the rotor, and a connecting member to be connected to a load. wherein when the pressing member rotates, the pressing member generates an axial or radial movement to thereby exert a pressing force to the connecting member to cause the connecting member to rotate due to a frictional force generated between the pressing member and the connecting member. The present invention further provides a fluid driving device incorporating the motor assembly.
Abstract:
A single-phase outer-rotor motor includes a stator and a rotor surrounding the stator. The stator and rotor define therebetween an even gap. The stator includes a stator core. The stator core includes a yoke and a plurality of teeth. Each tooth includes a tooth body and a tooth tip. A winding slot formed between each two adjacent tooth bodys. Windings are wound around the tooth bodys. The tooth tip forms an outer circumferential surface facing the rotor. The outer circumferential surfaces of all the tooth tips are connected to each other to collectively form a substantial cylindrical surface. The outer circumferential surface of the tooth tip is formed with a positioning groove deviating from a center of the outer circumferential surface of the tooth tip, which prevents the rotor from stopping at the dead-point position and hence ensures that the rotor can be successfully started when the motor is energized.
Abstract:
A single-phase outer-rotor motor and a stator thereof are provided. The stator includes a stator core having a yoke and a number of teeth. Each tooth includes a tooth body and a toot tip. A winding slot is formed between each two adjacent tooth bodies. A slot opening is formed between each two adjacent tooth tips. The tooth tip protrudes beyond the tooth body. Inner surfaces of at least part of the tooth tips facing the stator are formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening.
Abstract:
A single-phase outer-rotor motor includes a stator and a rotor surrounding the stator. The rotor includes a housing and a plurality of permanent magnets affixed to an inside of the housing. The permanent magnets are arranged spacedly along a circumferential direction. The stator includes a stator core and windings wound around the stator core. The stator core includes a yoke and a plurality of teeth extending radially outwardly from an outer edge of the yoke. Each of the teeth forms a tooth tip at a distal end thereof. The tooth tip has an outer surface facing the rotor. The permanent magnet is magnetized along the circumferential direction. Two adjacent permanent magnets have opposite magnetization directions. Adjacent surfaces of two adjacent permanent magnets have the same polarity. A magnetic member is disposed between each two adjacent permanent magnets.
Abstract:
A single phase motor and a hair dryer are provided. The motor includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator core includes an outer ring portion, teeth extending inwardly from the outer ring portion, and two pole shoes extending from a distal end of each tooth. A winding slot is formed between each two adjacent teeth. A slot opening is disposed between the pole shoes of the adjacent teeth, and is offset from one of the two adjacent teeth. The air supplying unit includes the single phase motor and an impeller. The startup angle and cogging torque of the motor are adjustable by adjusting the position/width of the slot opening, without the need of additional positioning slots or positioning holes defined at the pole shoes, which makes the motor structure simple.
Abstract:
A drive apparatus for an electric bike includes a hollow housing body, an internal ring gear fixed to the housing body, and a main shaft. At least two motor units are mounted in the housing body. Each motor unit includes a support bracket and a number of motors mounted on the support bracket. Each motor drives the internal gear through a transmission mechanism to rotate the housing body about the main shaft. The motors share one controller. Peaks of the motor cogging torque can be staggered.
Abstract:
An actuator for controlling an air damper includes a motor, an output connector for connecting the actuator to the air damper, a transmission mechanism connecting the motor to the output connector, and an energy storage device that drives the output connector to close the air damper when power to the motor is cut off. The motor has a stator and a rotor. The stator has a stator core including a yoke and nine poles extending from the yoke. The rotor has a shaft and an annular permanent magnet. The magnet forms twelve poles with alternate N and S polarities. An inclination angle of boundaries between adjacent poles of the magnet relative to an axis of the motor is in the range of 13 to 17 degrees.
Abstract:
A rotor for a brushless motor includes a shaft, a rotor core and a number of permanent magnets. The rotor core includes inner and outer annular portions. The inner annular portion has a central hole for receiving the shaft. The outer annular portion includes a number of sector segments arranged in a ring, with adjacent sector segments defining a slot there between for receiving a corresponding permanent magnet. Radially outer ends of adjacent sector segments are interconnected by a connector. The sector segments include first sector segments and second sector segments arranged alternately. The first sector segments are separated from the inner annular portion. The second sector segments are each connected to the inner annular portion by connecting arms.
Abstract:
A single phase permanent magnet motor includes a stator and a rotor. The stator includes a stator corer and windings. The stator corer includes a yoke portion and stator teeth. Each stator tooth includes a winding portion and a pole shoe connected to an end of the winding portion. Each pole shoe includes a pole face. The pole face defines a first positioning notch at a middle thereof. Each of the pole faces further defines at least one second positioning notch. Said at least one second positioning notches in one of pole shoe are located at the same side of the first positioning notch of the corresponding one pole shoe. The first and second positioning notches are configured such that an initial position of the rotor received in the space of the stator is offset from a dead point position.
Abstract:
A single phase permanent magnet motor includes a stator. The stator includes a stator core and windings. The stator core includes a ring portion, tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body. Each pole shoe defines a positioning slot. A center of each positioning slot is offset from a center of symmetry of one adjacent tooth body so that a torque fluctuation of an output torque of the single phase permanent magnet motor during operation is less than 50%. As a result, the motor vibration and noise are small.