Electromechanical power steering system for a motor vehicle, comprising • an electric motor having a stator, which is fitted with at least two electrical winding sets, and having a rotor, which is fitted with permanent magnets, which electric motor assists the steering movement, which is introduced into an input means by a motor car driver, in order to exert a steering movement on the motor vehicle, • a main control unit which determines a motor current prespecification, which is intended to be output to the electrical winding sets, from at least one prespecified steering value which characterizes the steering movement which is introduced by the motor car driver, whereby the main control unit comprises a basic controller, • at least one power control unit which provides the motor current prespecification, which is determined in the main control unit, and feeds the said motor current prespecification to the electrical winding sets, wherein for each of the winding sets, at least • one driver control system is provided, wherein all driver control systems and the basic controller of the main control unit each have a microcontroller and are combined to form one assembly, • one power driver which is connected to one of the driver control systems is provided, wherein at least two power drivers are arranged in a power control unit, and each power driver is designed as a half-bridge with power semiconductor switches, characterized in that at least two drive control systems are provided, and in that the basic controller of the main control unit is connected to the driver control systems and the driver control systems are connected directly to one another via two-way signal communication lines in each case. • an electric motor having a stator, which is fitted with at least two electrical winding sets, and having a rotor, which is fitted with permanent magnets, which electric motor assists the steering movement, which is introduced into an input means by a motor car driver, in order to exert a steering movement on the motor vehicle, • a main control unit which determines a motor current prespecification, which is intended to be output to the electrical winding sets, from at least one prespecified steering value which characterizes the steering movement which is introduced by the motor car driver, whereby the main control unit comprises a basic controller, • at least one power control unit which provides the motor current prespecification, which is determined in the main control unit, and feeds the said motor current prespecification to the electrical winding sets, wherein for each of the winding sets, at least • one driver control system is provided, wherein all driver control systems and the basic controller of the main control unit each have a microcontroller and are combined to form one assembly, • one power driver which is connected to one of the driver control systems is provided, wherein at least two power drivers are arranged in a power control unit, and each power driver is designed as a half-bridge with power semiconductor switches, connected to the driver control systems and the driver control systems are connected directly to one another via two-way signal communication lines in each case.