Abstract: A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage. One of the upper MOSFET and the lower MOSFET is a braking MOSFET, while another of the upper MOSFET and the lower MOSFET is a non-braking MOSFET. The fan apparatus further includes a back-electromotive force supply portion arranged to supply, to the braking MOSFET, power by a back-electromotive force caused by rotation of the motor portion while a power supply voltage for the electrically-driven rotor is not being supplied; and an electromagnetic brake portion arranged to electromagnetically brake the motor portion by causing the braking MOSFET to enter an ON state through the power supplied by the back-electromotive force supply portion.

Abstract: A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage. One of the upper MOSFET and the lower MOSFET is a braking MOSFET, while another of the upper MOSFET and the lower MOSFET is a non-braking MOSFET. The fan apparatus further includes a back-electromotive force supply portion arranged to supply, to the braking MOSFET, power by a back-electromotive force caused by rotation of the motor portion while a power supply voltage for the electrically-driven rotor is not being supplied; and an electromagnetic brake portion arranged to electromagnetically brake the motor portion by causing the braking MOSFET to enter an ON state through the power supplied by the back-electromotive force supply portion.

Abstract: A headquarters manager's terminal is used to prepare work instruction information and to transfer the prepared information to a headquarters server, and the headquarters server sends the work instruction information to a mobile terminal through a store server. The mobile terminal is used to prepare work report information for reporting activities performed in accordance with the work instruction, and to send the headquarters server the work report information with a photographed image of work site attached to. The headquarter server arranges and stores the work instruction information and work report information accompanying the photographed image, both being associated with each other, in a work instruction information file. The headquarter manager's terminal reads out the work instruction information file to display the work report information associated with the work instruction information.

Abstract: Data containing important information are stored in DB cards separable from terminals. The terminals and mediums are placed in corresponding relationship. Multi-security measures are taken to prevent a third party not authorized to access one of the DB cards from accessing the card and its data due to loss and robbery of the DB card and the third party's malice to thereby prevent the information from leaking out from the DB card. To this end, when the terminal accesses the DB card, the terminal compares its own hardware identification number with that of the card to determine whether the terminal is authorized to access the DB card. When it is, the terminal 2 further compares its own software identification number with that of the card to determine whether the terminal is further authorized to access a mobile DB in the card.

Abstract: With a portable compact flash card retaining application software/database set in a portable terminal, the portable terminal performs data processing by accessing the application software/database in the CF card. First, the portable terminal reads terminal ID previously stored in the CF card. Then, the portable terminal compares the terminal ID in the CF card with its own terminal ID previously set, and determines whether or not to be able to access the application software/database in the CF card based on the comparison result.

Abstract: A fan motor driving circuit of the present invention comprises a device for detecting a power source voltage and outputting a voltage in proportion to a difference between the power source voltage and a predetermined rated voltage when the power source voltage is greater than the rated voltage. The driving circuit also includes a device for controlling a rotary speed of a fan motor to a predetermined value by automatically varying a first signal input to a conducting current generating circuit for determining the rotary speed of the fan motor according to an output voltage of the power source voltage detecting means when the power source voltage is greater than a predetermined value.

Abstract: A self-diagnosis device is provided with a fan motor having a stator on which a stator coil is mounted, a rotor having a permanent magnet and a fan, a Hall device for detecting magnetic pole position of the permanent magnet and a current control device for controlling rotation of the rotor by controlling current fed to the stator coil. The self-diagnosis device judges if the fan motor has exceeded its service life. Further, the self-diagnosis device interrupts the current fed to the stator coil when the rotational speed is higher than an allowable value, and restarts the current automatically to return the fan motor into normal operation when the rotational speed is not higher than the allowable value.

Abstract: A fan motor driving circuit of the present invention comprises a device for detecting a power source voltage and outputting a voltage in proportion to a difference between the power source voltage and a predetermined rated voltage when the power source voltage is elevated over the rated voltage, and a device for controlling a rotary speed of a fan motor to a predetermined value by varying an elementary signal for determining the rotary speed of the fan motor according to an output voltage of the power source voltage detecting means automatically when the power source voltage is elevated over a predetermined value.

Abstract: Abnormal rotational speed detection means of the variable speed fan motor according to the invention comprises a threshold width setting means that generates a threshold width set value of the rotational speed and a subtractor means that subtracts the threshold width set value from a rotational speed command value transmitted from a rotational speed command means. A value obtained by subtracting the threshold width set value from the rotational speed command value is put into a rotational speed comparator means as the threshold value for the rotational speed of the fan motor.

Abstract: A self-diagnosis means is provided with a fan motor comprising a stator on which a stator coil is mounted, a rotor comprising a permanent magnet and a fan, a Hall device for detecting magnetic pole position of the permanent magnet and a current control means for controlling rotation of the rotor by controlling current to be fed to the stator coil. In an embodiment, the self-diagnosis means judges if the fan motor has drawn to the life. In another embodiment, the self-diagnosis means interrupts the current to be fed to the stator coil when the rotational speed is higher than an allowable value, and restarts the current automatically to return the fan motor into normal operation when the rotational speed is not higher than the allowable value.