Compressor module, compressed-air supply system, method for operating a compressor module or a compressed-air supply system

A compressed-air supply system comprising:

• at least one compressed-air consumer;
• a plurality of compressed-air lines;
• a plurality of electrically controllable valves;
• a compressed-air controller for actuating said plurality of electrically controllable valves;
• a compressor module including a compressor and a speed-controlled brushless electric motor for driving said compressor, wherein a motor current is produced during operation of said speed-controlled brushless electric motor;
• said speed-controlled brushless electric motor having a motor electronics system with an electronic commutator and a speed controller being assigned to said speed-controlled brushless electric motor, wherein a speed is controlled on a basis of a specified target speed during operation;
• said compressor module being connected to or having an electronic control unit configured to specify the target speed as a function of the motor current currently drawn by said speed-controlled brushless electric motor and a specified maximum motor current such that:
• the target speed corresponds to a specified constant speed as long as the motor current currently drawn by said speed-controlled brushless electric motor is lower than the specified maximum motor current;
• and,
• the target speed is adjusted such that the motor current currently drawn by said speed-controlled brushless electric motor corresponds to the specified maximum motor current as long as the motor current currently drawn by said speed-controlled brushless electric motor corresponds at least approximately to the specified maximum motor current;
• a compressed-air reservoir;
• said at least one compressed-air consumer is or is configured to be pneumatically connected to at least one of said compressor and said compressed-air reservoir via said plurality of compressed-air lines and said plurality of electrically controllable valves such that the compressed-air supply system is operable either with open operation or with closed operation;
• said compressed-air controller being configured:
• to evaluate a current signal, the value of which represents the value of the current motor current, and, in an event that the current motor current reaches the specified maximum motor current, to determine a reduced target speed value such that the motor current drawn by said speed-controlled brushless electric motor driving said compressor does not exceed the maximum motor current, but rather corresponds to the maximum motor current within a scope of control precision.

A method for operating a compressor module, the compressor module including a compressor and a speed-controlled brushless electric motor for driving the compressor, wherein a motor current is produced during operation of the speed-controlled brushless electric motor;

• the speed-controlled brushless electric motor having a motor electronics system with an electronic commutator and a speed controller being assigned to the speed-controlled brushless electric motor, wherein a speed is controlled on a basis of a specified target speed during operation;
• the compressor module being connected to or having an electronic control unit configured to specify the target speed as a function of the motor current currently drawn by the speed-controlled brushless electric motor and a specified maximum motor current, the method comprising:
• determining a target speed for the speed of the speed-controlled brushless electric motor such that:
• the target speed corresponds to a specified constant speed as long as the motor current currently drawn by the speed-controlled brushless electric motor is lower than the specified maximum motor current and
• the target speed is adjusted in such a way that the motor current currently drawn by the speed-controlled brushless electric motor corresponds to the specified maximum motor current as long as the motor current currently drawn by the speed-controlled brushless electric motor corresponds to the specified maximum motor current within a scope of control and adjustment precision.

A method for operating a compressed-air supply system having at least one compressed-air consumer, a plurality of compressed-air lines, a plurality of electrically controllable valves, a compressed-air controller for actuating the plurality of electrically controllable valves, and a compressor module including a compressor and a speed-controlled brushless electric motor for driving the compressor, wherein a motor current is produced during operation of the speed-controlled brushless electric motor;

• the speed-controlled brushless electric motor having a motor electronics system with an electronic commutator and a speed controller being assigned to the speed-controlled brushless electric motor, wherein a speed is controlled on a basis of a specified target speed during operation;
• the compressor module being connected to or having an electronic control unit configured to specify the target speed as a function of the motor current currently drawn by the speed-controlled brushless electric motor and a specified maximum motor current such that:
• the target speed corresponds to a specified constant speed as long as the motor current currently drawn by the speed-controlled brushless electric motor is lower than the specified maximum motor current;
• and,
• the target speed is adjusted such that the motor current currently drawn by the speed-controlled brushless electric motor corresponds to the specified maximum motor current as long as the motor current currently drawn by the speed-controlled brushless electric motor corresponds at least approximately to the specified maximum motor current;
• the compressed-air supply system further having a compressed-air reservoir, wherein the at least one compressed-air consumer is or is configured to be pneumatically connected to at least one of the compressor and the compressed-air reservoir via the plurality of compressed-air lines and the plurality of electrically controllable valves such that the compressed-air supply system is operable either with open operation or with closed operation;
• the method comprising:
• evaluating a current signal, the value of which represents the value of the current motor current, and,
• in an event that the current motor current reaches the specified maximum motor current, determining a reduced target speed value such that the motor current drawn by the speed-controlled electric motor driving the compressor does not exceed the maximum motor current, but rather corresponds to the maximum motor current within the scope of control precision.