Elektronisch kommutierbarer Motor

摘要

The invention relates to an electronically commutable motor whose excitation coils can be controlled in a successive manner at a commutation frequency via semi-conductor output stages and can be connected to a direct power supply voltage and disconnected therefrom, whereby said control signals are pulsed and undergo pulse-width modulation. Noise produced when the electrical supply is connected to and disconnected from the excitation coils is minimized by flattening out the rising or falling edge of the current flowing into the excitation coils, by increasing the pulse width ratio in the rising edges of the control signals according to a pre-defined or pre-definable set value for the revolution speed or output of said motor from a low initial value to an operating value assigned to the set point value, and by reducing the pulse width rates, starting from the operating value in the falling edges of the control signals to a low final cut off value according to the actual value of the revolution speed or output of said motor before reaching zero.