Motor apparatus

1 . A motor apparatus comprising:

a stator having a plurality of teeth formed in a circumference thereof;

a rotor rotatably installed in the stator, and having a plurality of magnets disposed in a circumference thereof; and

a 3-phase coil part having a plurality of coils wound around the teeth, respectively, wherein:

the coils having a preset phase difference are arranged in parallel;

the 3-phase coil part comprises a U-phase coil, a V-phase coil, and a W-phase coil;

the U-phase coil includes first groups of coils having a first phase difference arranged in parallel, the first groups including the coils that mechanically have an angle difference of 180° therebetween, are electrically in-phase, and are arranged in parallel;

the V-phase coil includes second groups of coils having a second phase difference arranged in parallel, the second groups including the coils that mechanically have an angle difference of 180° therebetween, are electrically in-phase, and are arranged in parallel;

the W-phase coil includes third groups of coils having a third phase difference arranged in parallel, the third groups including the coils that mechanically have an angle difference of 180° therebetween, are electrically in-phase, and are arranged in parallel;

the first phase difference is 20° to 30°, and the coils in the first groups have a phase difference of 180° and are arranged in parallel;

the second phase difference is 20° to 30°, and the coils in the second groups have a phase difference of 180° and are arranged in parallel;

the third phase difference is 20° to 30°, and the coils in the third groups have a phase difference of 180° and are arranged in parallel;

the rotor comprises 14-pole magnets; and

the stator comprises 18 coils.

2 . The motor apparatus of claim 1 , wherein:

the U-phase coil includes a first coil, a fifth coil, a sixth coil, a tenth coil, a fourteenth coil, and a fifteenth coil wound in parallel;

the V-phase coil includes a second coil, a third coil, a seventh coil, an eleventh coil, a twelfth coil, and a sixteenth coil wound in parallel; and

the W-phase coil includes a fourth coil, an eighth coil, a ninth coil, a thirteenth coil, a seventeenth coil, and an eighteenth coil wound in parallel.