A system comprising: a brushless direct current BLDC motor comprising: a shaft; a rotor connected to the shaft and provided with a permanent magnet; and a stator provided with: a stator core, a plurality of teeth surrounding the rotor, a direct current DC coil and an alternating current AC coil, wherein the DC coil and the AC coil are alternatively provided, in the circumferential direction, on the plurality of teeth; a magnetic flux guide unit magnetically coupled to said plurality of teeth, said plurality of teeth including a second tooth which is adjacent to a first tooth in the circumferential direction, the second tooth being configured to have a polarity opposite to that of the first tooth, when the first tooth is magnetized by power applied to the DC coil or the AC coil provided on the first tooth; wherein the system further comprises: a battery (631, 641) for supplying DC power to rotate the rotor when the BLDC motor performs a DC operation; an AC power unit for supplying AC power from an external power source to rotate the rotor when the BLDC motor performs an AC operation; a converter (635, 645) for rectifying the AC power to DC power; an inverter (611, 613, 621, 627) connectable to the AC coil and the AC power via the converter or to the DC coil and the battery; and wherein when the BLDC motor performs the DC operation, the DC coil and the battery are electrically connected to the inverter such that the DC coil is fed power from the battery via the inverter, and when the BLDC motor performs the AC operation, the AC coil and the converter are electrically connected to each other via the inverter such that the AC coil is fed power from the AC external power supply via the converter and the inverter. a shaft; a rotor connected to the shaft and provided with a permanent magnet; and a stator provided with: a stator core, a plurality of teeth surrounding the rotor, a direct current DC coil and an alternating current AC coil, wherein the DC coil and the AC coil are alternatively provided, in the circumferential direction, on the plurality of teeth; a magnetic flux guide unit magnetically coupled to said plurality of teeth, said plurality of teeth including a second tooth which is adjacent to a first tooth in the circumferential direction, the second tooth being configured to have a polarity opposite to that of the first tooth, when the first tooth is magnetized by power applied to the DC coil or the AC coil provided on the first tooth; a stator core, a plurality of teeth surrounding the rotor, a direct current DC coil and an alternating current AC coil, wherein the DC coil and the AC coil are alternatively provided, in the circumferential direction, on the plurality of teeth; a magnetic flux guide unit magnetically coupled to said plurality of teeth, said plurality of teeth including a second tooth which is adjacent to a first tooth in the circumferential direction, the second tooth being configured to have a polarity opposite to that of the first tooth, when the first tooth is magnetized by power applied to the DC coil or the AC coil provided on the first tooth; wherein the system further comprises: a battery (631, 641) for supplying DC power to rotate the rotor when the BLDC motor performs a DC operation; an AC power unit for supplying AC power from an external power source to rotate the rotor when the BLDC motor performs an AC operation; a converter (635, 645) for rectifying the AC power to DC power; an inverter (611, 613, 621, 627) connectable to the AC coil and the AC power via the converter or to the DC coil and the battery; and wherein when the BLDC motor performs the DC operation, the DC coil and the battery are electrically connected to the inverter such that the DC coil is fed power from the battery via the inverter, and when the BLDC motor performs the AC operation, the AC coil and the converter are electrically connected to each other via the inverter such that the AC coil is fed power from the AC external power supply via the converter and the inverter. a battery (631, 641) for supplying DC power to rotate the rotor when the BLDC motor performs a DC operation; an AC power unit for supplying AC power from an external power source to rotate the rotor when the BLDC motor performs an AC operation; a converter (635, 645) for rectifying the AC power to DC power; an inverter (611, 613, 621, 627) connectable to the AC coil and the AC power via the converter or to the DC coil and the battery; and wherein when the BLDC motor performs the DC operation, the DC coil and the battery are electrically connected to the inverter such that the DC coil is fed power from the battery via the inverter, and when the BLDC motor performs the AC operation, the AC coil and the converter are electrically connected to each other via the inverter such that the AC coil is fed power from the AC external power supply via the converter and the inverter.