MOTOR SYSTEM AND CONTROL METHOD THEREOF, AND COMPRESSOR USING THE SAME

A motor system, a method for controlling the same, and a compressor using the same are provided to be applied to a system having a slow load change by detecting a DC current through a low speed CPU to adjust an output voltage and an output frequency. A motor system includes a BLDC(Brushless Direct Current) motor(17), an inverter unit(13), a current detection unit(14), an induced voltage detection unit(15), and a control unit(16). The inverter unit(13) drives the BLDC motor(17). The current detection unit(14) detects a DC current of the inverter unit(13). The induced voltage detection unit(15) detects an induced voltage of the BLDC motor(17). The control unit(16) calculates a d-axis current based on the DC current detected by the current detection unit(14) and the induced voltage detected by the induced voltage detection unit(15). The control unit(16) controls at least one of an output voltage and an output frequency of the inverter unit(13) until the d-axis current reaches a predetermined target value.