A suction brush assembly of a vacuum cleaner has a housing having a suction duct to provide a suction passage for dust, a rotation roller having a plurality of ribs formed at an outer circumference, a wheel disposed at the housing, and a power transmission unit to rotate the rotation member by exerting a rotation force of the wheel to the rotation member when the wheel is rotated. Voltage variations of the power supply caused by switching currents are detected by a voltage sensor control circuit. Frayed edges also provide flexibility to assist in installation of a card of pleated filter medium into a paper board frame. A valve controls flow through the third port. Consequently, the speed and torque of the DC motor can be limited by the pulse-width modulation of control signals.