Abstract: A filter module includes filters. Each of the filters is configured to control communications bands having overlapping bandwidths each with the other. Each of the communications bands, allocated to any one of the filters, has a different limit frequency from the other.

Abstract: A filter module includes filters. Each of the filters is configured to control communications bands having overlapping bandwidths each with the other. Each of the communications bands, allocated to any one of the filters, has a different limit frequency from the other.

Abstract: There is provided an apparatus for driving a motor including: a converter applying an input voltage to each phase winding of the motor; and a processor controlling a phase current flowing to the phase winding to which the input voltage is applied to be increased or decreased in a preset reference range and controlling phase commutation of the motor based on a change in the phase current.

Abstract: There is provided an apparatus for driving a switched reluctance motor (SRM), including: a motor driver applying a input voltage supplied from a power supply unit to phase windings of the SRM through a switching operation; and a processor controlling the switching operation of the motor driver depending on a driving state of the SRM.

Abstract: There is provided an apparatus for driving a motor including: a converter applying an input voltage to each phase winding of the motor; and a processor controlling a phase current flowing to the phase winding to which the input voltage is applied to be increased or decreased in a preset reference range and controlling phase commutation of the motor based on a change in the phase current.

Abstract: Embodiments of the invention provide a motor acceleration apparatus and a motor acceleration method. According to at least one embodiment, the motor acceleration apparatus includes a rectifier converting household power into direct current (DC) voltage to output the converted DC voltage, a switching converter switching the DC voltage output from the rectifier in an alternating current manner to drive a two-phase switched reluctance motor (SRM), and a microprocessor controlling the switching converter at the time of initial acceleration of the two-phase SRM, so that an initially set dwell angle is changed to a dwell angle in a normal operation state and starting an advanced-angle control.

Abstract: Disclosed herein are an apparatus and method for preventing a sensing error in a switched reluctance motor (SRM). The apparatus includes: a rectifying unit; a main controlling unit driven by power supplied from the rectifying unit, and operated in an error mode in the case in which the rotation speed of the rotor is decreased to a predetermined value or less; a voltage detecting; and an error preventing unit preventing an operation of the main controlling unit in an error mode at the time of reconnection of a power supply when it is sensed that the power has been blocked using the variation in the supplied voltage detected by the voltage detecting unit.

Abstract: A system and a method are disclosed for changing a filter provided in an air purifier at an optimum time by measuring the rotational speed of a motor that operates the filter. The system for determining an air purifier filter change time includes: a motor speed measurement unit; a time counting unit; a speed determination unit; a time comparison unit; and a filter change time determination unit.

Abstract: A system and method for changing a filter provided in an air purifier at an optimum time by measuring the rotational speed of a motor that operates the filter.