A double insulated rotor (10) for an electric motor has a rotor core (14) fitted to a shaft (12) by way of an insulating sleeve (24) moulded to the shaft (12).

A motor has a shaft with a lengthwise through hole in a center, and a guider of a semi-circular shape having plural helical leaves to increase sucking force for gas or liquid, strengthening sucking smoothness. Water current flowing through the water passageway performs heat-dispersing function when the motor operates so as to prolong the service life of the motor. A pressure-dividing ball is placed in front of the guider to divide strong current pressure into several small current pressures to b...

In a motor having a bearing housing 7 with a hollow portion 23, a radial bearing 9 held in the hollow portion 23, a thrust receiving plate 8 provided at one end of the hollow portion 23, and a rotary shaft 1 which is rotatably supported by the radial bearing 9 in a state that an extreme end thereof is in contact with the thrust receiving plate 8, the bearing housing 7, shaped like a cup, includes a cylindrical portion 21 and a bottom portion 22 defining one end of the cylindrical portion 21, the...

A motor includes a magnet formed in a cylindrical shape and divided in the circumferential direction in at least the outer periphery and alternately polarized to different poles, a first coil, a magnet and a second coil placed in the axial direction of the magnet, a first outer magnetic pole opposed to the outer periphery of the magnet and a hollow-shaped first inner magnetic pole opposed to the inner periphery of the magnet, excited by the first coil respectively, a second outer magnetic pole o...

In the present invention, a Q-phase motor, which electronically switches current paths to plural-phase windings, comprises waveform shaping signal producing device for producing Q-phase waveform shaping signals having a conduction width larger than an electric angle of 360/Q degrees and superimposed signal producing device for superimposing signals to the waveform shaping signals. The superimposed signal producing device comprises superimposed timing producing device for producing superimposed t...

A motor comprises a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a turn, and a rotor incorporating plural permanent magnets. The rotor is rotated and driven by utilizing reluctance torque in addition to magnetic torque. Since the winding is not crossed, the size of the coil end is reduced.

A single-phase motor which includes a rotor magnet alternately magnetized to different poles by dividing it along a circumferential direction and in which a coil is disposed in an axial direction of said rotor magnet. Outer magnetized portions of an outer yoke magnetized by the coil and inner magnetized portions of an inner yoke magnetized by the coil are opposed to outer and inner peripheral surfaces of the rotor, respectively. There is also provided a holder for holding the rotor magnet at a p...

A motor having a rotary shaft, a coil wound on an iron core fixed to the rotary shaft, a yoke member, a magnetic flux producing member and commutator means has its yoke member constructed with yoke supporting portions serving as a magnetic path of magnetic flux and four magnetic poles having substantially arcuate shape. Each magnetic pole has a largest dimension of thickness at a center portion thereof and extends outwardly with gradually reduced thickness in accordance with the distance from th...

A motor comprising two or more rotors (20, 30) rotated by means of a common power supply (6), each rotor (20, 30) having a plurality of poles (22, 32) and being associated with a stator (16, 26) having a plurality of poles (18, 28), wherein the arrangement of rotor poles (22, 32) and stator poles (18, 28) is different for each rotor 920, 30) so that the rotors (20, 30) rotate at different speeds when the common power supply (6) is applied.

An electric motor which achieves reduced axial height by an arrangement of a motor case which mounts an outer field magnet and which also rotatably supports a motor shaft. A cup shaped yoke fixed to the shaft supports a rotor core and coil. A commutator is mounted on the yoke and is contacted by brushes fixed to a resin member embedded in an aperture formed in the motor case.