System for controlling compressor of cooling system and method for controlling the same

A cooling system comprising:

• a compressor having a driving shaft that can be rotatable clockwise and counterclockwise and operated by a power of a motor outputting different torque characteristics depending on the rotational directions of the driving shaft;
• a compressor control part including a selector for selecting an output torque characteristic of the motor;
• a switching part for turning on or off the motor;
• and a micom for controlling the selector to operate the compressor at a torque characteristic suitable for an object to be cooled;
• first and second heat exchangers which heat-exchange coolant forcibly delivered from the compressor with an indoor or an outdoor respectively;
• and
• an expansion unit provided in a coolant tube connecting the first and second heat exchangers.

A method for controlling an operation of a compressor in a cooling system, the method comprising the steps of:

• (a) an initial starting step of starting the compressor equipped with a motor different torque characteristics depending on rotary directions of a driving shaft at a first torque characteristic;
• (b) determining the operation torque characteristic of the motor,
• (c) when it is determined that the motor operates at the first torque characteristic in consequence of performing the step (b), if a first condition is met during an operation of the compressor, stopping the compressor;
• (d) determining whether it is suitable to continuously operate the motor at the first torque characteristic in a state that the compressor is stopped, and if it is determined that it is suitable, maintaining the operation torque characteristic of the motor, while if it is determined that it is not suitable, converting the operation torque characteristic of the motor from the first torque characteristic to a second torque characteristic, and if a second condition is met, operating the compressor.