Abstract: A fan motor may include a stator supporting portion for supporting a stator with a drive coil, a rotor rotatably supported by a rotating center shaft (rotating shaft) provided at the stator supporting portion, a magnet placed on the inner peripheral side of the rotor so as to face the drive coil, a fan (impeller portion) provided on the outer peripheral side of the rotor, a control board having a drive control IC performing polarity switching control of the drive coil, a hollow tubular frame having a suction opening and a discharge opening, and an installation member (guide blade) for installing the stator supporting portion into the hollow portion of the frame. The control board is placed in the frame so as to be substantially in parallel with the rotating center shaft.

Abstract: A fan motor drive control apparatus comprises a plurality of drive circuits for driving respectively a plurality of fan motors, and a speed change-over control circuit for transmitting a control signal for changing over speeds of the fan motors, to the plurality of the drive circuits, wherein each of the drive circuit comprises a stopping detection terminal for detecting stopping of a fan motor as an object to be driven, and the speed change-over control circuit transmits the control signal in accordance with a signal received from the stopping detection terminal.

Abstract: To provide a pump and pumping system in which the mounting efficiency is improved and which can be controlled without pulling out a flexible tape, etc. from a pump in order to satisfy a demand for smaller information systems and a demand for mounting various kinds of electronic components with high density. A pump comprising an impeller having a plurality of vanes around its outer circumference and a rotor magnet on its inner circumference, a plurality of salient poles positioned opposite to the rotor magnet to radially extend outwardly in the radial direction of the impeller, a pump casing interposed between the rotor magnet and the plurality of salient poles, a driving IC for supplying current to coils wound around the salient poles, and an electronic board on which the driving IC is mounted; wherein the electronic board is fixed to the pump casing while the driving IC is interposed between the plurality of salient poles.

Abstract: A fan motor drive control apparatus comprises a plurality of drive circuits for driving respectively a plurality of fan motors, and a speed change-over control circuit for transmitting a control signal for changing over speeds of the fan motors, to the plurality of the drive circuits, wherein each of the drive circuit comprises a stopping detection terminal for detecting stopping of a fan motor as an object to be driven, and the speed change-over control circuit transmits the control signal in accordance with a signal received from the stopping detection terminal.

Abstract: To enable preventing any unevenness in a synchronous signal itself from being caused owing to errors of placement of various components so as to deteriorate a detection accuracy; and by applying the above measures, consequently to provide a polygon mirror drive motor, with which it is possible to detect a signal for accurately controlling an emission timing of the laser beam to be emitted from a laser light source, as well as a laser mirror radiation device equipped with the polygon mirror drive motor described above. A frequency generation magnetized section, a frequency generation pattern, and a frequency dividing circuit are provided. The frequency dividing circuit outputs a signal, detected by the frequency generation pattern when the frequency generation magnetized section rotates, after the frequency dividing operation of the signal for the number of mirror planes of a polygon mirror.

Abstract: A brushless motor including: a rotor casing having a cylindrical wall with an opening, the rotor casing holding a magnet therein, the magnet having an exposed portion which is exposed through the opening of the rotor casing; a stator core having drive coils; Hall elements for detecting the magnetic field of the magnet, the Hall elements being arranged outside the cylindrical wall of the rotor casing; a drive circuit applying drive currents to the drive coils in accordance with output signals of the Hall elements; a magnetic flux varying member provided at a point on the cylindrical wall of the rotor casing; and an index signal processing circuit for generating an index signal in accordance with an output signal of one of the Hall elements.