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.

2 . The motor apparatus of claim 1 , wherein:

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 the coils having a first phase difference arranged in parallel, each of the first groups including the coils having the same phase difference arranged in series;

the V-phase coil includes second groups of the coils having a second phase difference arranged in parallel, each of the second groups including the coils having the same phase difference arranged in series; and

the W-phase coil includes third groups of the coils having a third phase difference arranged in parallel, each of the third groups including the coils having the same phase difference arranged in series.

3 . The motor apparatus of claim 2 , wherein:

the first phase difference is 20° to 30°, and the coils in each of the first groups mechanically have an angle difference of 180° therebetween and are electrically in-phase;

the second phase difference is 20° to 30°, and the coils in each of the second groups mechanically have an angle difference of 180° therebetween and are electrically in-phase; and

the third phase difference is 20° to 30°, and the coils in each of the third groups mechanically have an angle difference of 180° therebetween and are electrically in-phase.

4 . The motor apparatus of claim 3 , wherein:

the rotor comprises 10-pole magnets; and

the stator comprises 12 coils.

5 . The motor apparatus of claim 4 , wherein:

the first groups include a first coil and a seventh coil wound in series, a second coil and an eighth coil wound in series, such that the first-seventh coil set and the second-eighth coil set are arranged in parallel;

the second groups include a third coil and a ninth coil would in series, and a fourth coil and a tenth coil wound in series, such that the third-ninth coil set and the fourth-tenth coil set are arranged in parallel; and

the third groups include a fifth coil and an eleventh coil wound in series, and a sixth coil and a twelfth coil would in series, such that the fifth-eleventh coil set and the sixth-twelfth coil set are arranged in parallel.

6 . The motor apparatus of claim 3 , wherein:

the rotor comprises 14-pole magnets; and

the stator comprises 18 coils.

7 . The motor apparatus of claim 6 , wherein:

the first groups include a first coil and a tenth coil wound in series, a fifth coil and a fourteenth coil wound in series, and a sixth coil and a fifteenth coil wound in series, such that the first-tenth coil set, the fifth-fourteenth coil set, and the sixth-fifteenth coil set are arranged in parallel;

the second groups include a second coil and an eleventh coil wound in series, a third coil and a twelfth coil wound in series, and a seventh coil and a sixteenth coil wound in series, such that the second-eleventh coil set, the third-twelfth coil set, and the seventh-sixteenth coil set are arranged in parallel; and

the third groups include a fourth coil and a thirteenth coil wound in series, an eighth coil and a seventeenth coil wound in series, and a ninth coil and an eighteenth coil wound in series, such that the fourth-thirteenth coil set, the eighth-seventeenth coil set, and the ninth-eighteenth coil set are arranged in parallel.

8 . The motor apparatus of claim 3 , wherein:

the rotor comprises 14-pole magnets; and

the stator comprises 12 coils.

9 . The motor apparatus of claim 8 , wherein:

the first groups include a first coil and a seventh coil wound in series, and a second coil and an eighth coil wound in series, such that the first-seventh coil set and the second-eighth coil set are arranged in parallel;

the second groups include a third coil and a ninth coil wound in series, and a fourth coil and a tenth coil wound in series, such that the third-ninth coil set and the fourth-tenth coil set are arranged in parallel; and

the third groups include a fifth coil and an eleventh coil wound in series, and a sixth coil and a twelfth coil wound in series, such that the fifth-eleventh coil set and the sixth-twelfth coil set are arranged in parallel.

10 . The motor apparatus of claim 3 , wherein:

the rotor comprises 16-pole magnets; and

the stator comprises 18 coils.

11 . The motor apparatus of claim 10 , wherein:

the first groups include a first coil and a tenth coil wound in series, a second coil and an eleventh coil wound in series, and a ninth coil and an eighteenth coil wound in series, such that the first-tenth coil set, the second-eleventh coil set, and the ninth-eighteenth coil set are arranged in parallel;

the second groups include a third coil and a twelfth coil wound in series, a fourth coil and a thirteenth coil wound in series, and a fifth coil and a fourteenth coil wound in series, such that the third-twelfth coil set, the fourth-thirteenth coil set, and the fifth-fourteenth coil set are arranged in parallel; and

the third groups include a sixth coil and a fifteenth coil wound in series, a seventh coil and a sixteenth coil wound in series, and an eighth coil and a seventeenth coil wound in series, such that the sixth-fifteenth coil set, the seventh-sixteenth coil set, and the eighth-seventeenth coil set are arranged in parallel.

12 . The motor apparatus of claim 1 , wherein:

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; and

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.

13 . The motor apparatus of claim 12 , wherein:

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; and

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.

14 . The motor apparatus of claim 13 , wherein:

the rotor comprises 10-pole magnets; and

the stator comprises 12 coils.

15 . The motor apparatus of claim 14 , wherein:

the U-phase coil includes a first coil, a second coil, a seventh coil, and an eighth coil wound in parallel;

the V-phase coil includes a third coil, a fourth coil, a ninth coil, and a tenth coil wound in parallel; and

the W-phase coil includes a fifth coil, a sixth coil, an eleventh coil, and a twelfth coil wound in parallel.

16 . The motor apparatus of claim 13 , wherein:

the rotor comprises 14-pole magnets; and

the stator comprises 18 coils.

17 . The motor apparatus of claim 16 , 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.

18 . The motor apparatus of claim 13 , wherein:

the rotor comprises 14-pole magnets; and

the stator comprises 12 coils.

19 . The motor apparatus of claim 18 , wherein:

the U-phase coil includes a first coil, a second coil, a seventh coil, and an eighth coil wound in parallel;

the V-phase coil includes a third coil, a fourth coil, a ninth coil, and a tenth coil wound in parallel; and

the W-phase coil includes a fifth coil, a sixth coil, an eleventh coil, and a twelfth coil wound in parallel.

20 . The motor apparatus of claim 13 , wherein:

the rotor comprises 16-pole magnets, and the stator comprises 18 coils;

the U-phase coil includes a first coil, a second coil, a ninth coil, a tenth coil, an eleventh coil, and an eighteenth coil wound in parallel;

the V-phase coil includes a third coil, a fourth coil, a fifth coil, a twelfth coil, a thirteenth coil, and a fourteenth coil wound in parallel; and

the W-phase coil includes a sixth coil, a seventh coil, an eighth coil, a fifteenth coil, a sixteenth coil, and a seventeenth coil wound in parallel.