Abstract: A control circuit (1) for an electronically commutated, direct current motor (M) without a collector with a semiconductor end stage (2) which is controlled by an electronic commutation control (4) via a driver stage (6) for the time-offset control of the stator coils (U,V,W) of the motor (M) for the purpose of producing a magnetic rotating field for a rotor depending on the rotor rotation position. Two redundant stall protection units (10, 12) monitor the motor (M) during operation for rotation of the rotor, whereby in the case of a determined stall situation, the first stall protection unit (10) deactivates the driver stage (6) and the second stall protection unit (12) shuts off the supply voltage (UVCC) for the driver stage (6).

Abstract: The disclosure relates to an electronic control circuit for an electric device, in particular designed as a commutation electric system of an EC motor, having a plurality of power transistors which are controlled in an operating mode for controlling the device. An additional, similar, non-charged reference transistor in the operating mode of the power transistors is arranged or formed together with the power transistors on a common support or substrate.

Abstract: A control circuit (1) for an electronically commutated, direct current motor (M) without a collector with a semiconductor end stage (2) which is controlled by an electronic commutation control (4) via a driver stage (6) for the time-offset control of the stator coils (U,V,W) of the motor (M) for the purpose of producing a magnetic rotating field for a rotor depending on the rotor rotation position. Two redundant stall protection units (10, 12) monitor the motor (M) during operation for rotation of the rotor, whereby in the case of a determined stall situation, the first stall protection unit (10) deactivates the driver stage (6) and the second stall protection unit (12) shuts off the supply voltage (UVCC) for the driver stage (6).

Abstract: The present invention provides a high-pressure blower comprising a fan arrangement which includes a fan, and a fan housing for conveying working air. An electromotor drives the fan via a motor shaft to provide motor self-ventilation by generating a cooling air stream flowing through the motor due to a cooling wheel driven by the rotor. A wall section separates the interior space of the fan housing accommodating the fan airtight from the interior space of the blower accommodating the electromotor so that the cooling air stream flowing through the electromotor is separated and independent of the air flow of the working air conveyed to the fan.

Abstract: The invention relates to a circuit arrangement for DC-isolated transmission of an analog input variable by means of a signal transformation part, having a voltage input and a voltage output, and in particular also for voltage matching between the voltage input and the voltage output of the circuit arrangement. The signal transformation part is designed as an inductive signal transformation part (6) and the circuit arrangement is provided with a charging and discharging arrangement having a switching element (S1) in such a way that, as a result of the switching element (S1) being actuated, a charging or discharging current (i1, i2) that is proportional to an input voltage (U1) and flows through the signal transformation part (6) occurs and an output voltage (U3) is established at the voltage output.

Abstract: The present invention provides a high-pressure blower comprising a fan arrangement which includes a fan (82), and a fan housing (83) for conveying working air. An electromotor drives the fan (82) via a motor shaft (72) with means for motor self-ventilation by generating a cooling air stream flowing through the motor by means of a cooling wheel driven by the rotor. A wall section (70) separates the interior space of the fan housing (83) accommodating the fan (82) airtight from the interior space of the blower accommodating the electromotor (2) so that the cooling air stream flowing through the electromotor is separated and independent of the air flow of the working air conveyed to the fan (82).