A motor system with a current sensorless control includes a motor, a drive module, and a motor control module. The motor control module controls the motor to rotate through the drive module. The motor control module includes a command generation module, a command conversion module, and an angle generation module. The command generation module generates speed information and transmits the speed information to the angle generation module, and the command generation module generates a voltage command and transmits the voltage command to the command conversion module. The angle generation module generates an electrical angle. The command conversion module converts the voltage command and the electrical angle into a control signal. The motor control module adjusts a phase of a motor input voltage to meet a phase of a motor input current according to the control signal.