Abstract: A motor structure includes a stator and a rotor. The stator includes a coil assembly which includes a ring-shaped slot having an inner periphery on its inner side and an outer periphery on its outer side away from the inner periphery, a plurality of first teeth mounted around the inner periphery of the ring-shaped slot, and a plurality of second teeth mounted around the outer periphery of the ring-shaped slot; wherein each of the first teeth is arranged to partly fall behind or exceed the corresponding one of the second teeth, and a coil wound in the ring-shaped slot. The rotor includes a circular magnet located above the coil.

Abstract: A plural motor assembly includes a first motor generating a parameter, a control circuit electrically connected to the first motor for detecting the parameter and outputting a switch signal while the parameter is abnormal, and a second motor electrically connected to the control circuit and operating in response to the switch signal. Thus, when one motor is damaged, the speed of rotation of the other motor is increased to maintain normal operation.

Abstract: A heat dissipation device includes a rotor, a plurality of centrifugal blades provided around the rotor, a stator provided inside the rotor for driving the rotor to rotate, and a base provided under the rotor and the stator without enclosing the rotor. The base includes a central portion connected with the stator, and a plurality of extension portions extending from the central portion to the outside. A plurality of holes are formed at a side of each of the plurality of extension portions away from the central portion, respectively.

Abstract: The present invention discloses a self-stabilizing heat exhaust system including at least several rate-variable fans. Each of the rate-variable fans further includes a power-input terminal for inputting power to the rate-variable fans; a grounded terminal for providing the rate-variable fan a lower level; a signal-output terminal coupled to an adjacent rate-variable fan for outputting a speed signal which may be a normal signal or an abnormal signal; a signal-input terminal coupled to another adjacent rate-variable fan for receiving the speed signal; and a control circuit responding to the abnormal signal to make the rate-variable fan rotate at the higher rotation rate and responding to the normal signal to make the rate-variable fan rotate at the lower rotation rate.

Abstract: A motor structure is disclosed. The motor structure comprises a stator and a rotor. Among these, the stator further comprises a coil seat defined by a bottom plate, a plurality of first teeth and a plurality of second teeth. A coil is formed in the coil seat. The first teeth formed around inner periphery of the bottom plate and have a first extending portion extending so as to constitute a reversed L shape. The second teeth formed around outer periphery of the bottom plate and have a second extending portion so as to constitute a reversed L shape. The rotor, coupled to the stator, further have a circular magnet formed above the coil seat, the first extending portion and the second extending portion. Each of the first and second extending portions further comprises a chamfer, a fillet, a clearance, a fold and different dimension.

Abstract: A rotor balance structure, which comprises a vane shell, a rotor case installed on the inner side of the vane shell, and a magnet installed on the inner side of the rotor case. The rotor is coupled with a stator, which comprises a coil and a magnetic conduction silicon steel set. When the coil on the stator is provided with an electrical current and generates a magnetic field, the magnet is attracted through the magnetic conduction silicon steel set to rotate the rotor balance structure. The feature of the rotor balance structure of the present invention is in that a magnetically conductive plate is included and installed under the inner side of the vane shell top. The magnetically conductive plate does not have any magnetic conduction with the rotor case but has an attractive magnetic interaction with the coil so that the rotational balance of the rotor balance structure can be improved.

Abstract: A plural motor assembly includes a first motor generating a parameter, a control circuit electrically connected to the first motor for detecting the parameter and outputting a switch signal while the parameter is abnormal, and a second motor electrically connected to the control circuit and operating in response to the switch signal. Thus, when one motor is damaged, another motor is started for maintaining a normal operation.

Abstract: A starting circuit and a method for stagedly starting an electrosensitive circuit without introducing a surging current are disclosed. The method includes (a) providing a feedback signal by the electrosensitive circuit, (b) comparing the feedback signal with a reference signal to generate a control signal, and (c) stagedly increasing a current inputted into the electrosensitive circuit according to a voltage of the control signal so that the electrosensitive circuit is stagedly started without introducing the surging current. The starting circuit includes a comparing circuit for receiving a feedback signal from the electrosensitive circuit and comparing the feedback signal with a reference signal to generate a control signal, and a controlling circuit for controlling the electrosensitive circuit to be stagedly started according to the control signal without introducing the surging current.