Abstract: A vacuum cleaner (10) is connected to a dust collecting nozzle (14) via a hose (11) provided with a hose handle (12). The vacuum cleaner comprises a suction fan (17), driven by an electric motor (18), and an electric control device (20) for the control and/or setting of the motor speed for different operating modes. The control device (20) is operated by an operating device (21) disposed on the hose handle (12) and being electrically connected to the control device (20) via two coils, coupled to each other, a primary coil (28) of which being disposed in the vacuum cleaner and a secondary coil ( 26) being disposed in the hose. A conversion device (31, 34, 36, 38), disposed in the vacuum cleaner, is provided to sense and convert the states of a secondary circuit (25, 26), having as a part the secondary coil (26), said states corresponding to different operating modes and being caused by said operating device.

Abstract: A vacuum cleaner has an electric motor (15) and a suction fan (17) connected to the motor. A control device (16) drives the motor in a speed range limited upwards by a rated voltage corresponding to a rated power level for the motor. Circuit components (46, 39; 30, 31) are provided after actuation of a manually operable switch (19), to temporarily connect the motor (15) to a voltage exceeding said rated voltage, resulting in operation at an increased power level during a predetermined time. The circit components (46, 39; 30 31) for connecting of the increased voltage includes a thermally-operated device (46, 30) which cooperates with the control device (16) for the connection and disconnection, respectively, of the increased voltage, the predetermined time being determined by the heating time for the thermally-operated device.