Rotor and motor
A rotor and a motor are provided in which the q-axis inductance is increased and the leakage of magnetic flux is prevented to ensure high power operation at high level driving speeds. The rotor includes a rotor core, which is formed at the center thereof with a hole coupled to a shaft, and a module configured to be coupled to the rotor core and comprises a pair of first permanent magnets, which are space apart from each other, and a first connection part connecting ends of the first permanent magnets to each other.
1. A rotor comprising:
a rotor core with a hole coupled to a shaft disposed at a center of the rotor; and
first modules and second modules alternately disposed next to each other with a gap of a constant width in the rotor core, each module comprising:
a pair of first permanent magnets spaced apart from each other;
a first connection part which connects ends of the first permanent magnets to each other;
a pair of second permanent magnets spaced apart from the first permanent magnets; and
a second connection part which connects the ends of the second permanent magnets to each other,
wherein the first permanent magnets of the first modules have an N pole on their sides facing the gap, while the first permanent magnets of the second modules have an S pole on their sides facing the gap, and
wherein the pair of second permanent magnets are magnetized with the same poles as the first permanent magnets.
2. The rotor of claim 1 , wherein the first connection part connects the ends adjacent to an inner side of the rotor core to each other.
3. The rotor of claim 1 , wherein the first connection part is spaced apart from an inner surface of the rotor core.
4. The rotor of claim 1 , wherein the modules comprise:
a third permanent magnet which is disposed at an outer side of the rotor core between the first permanent magnets,
wherein the third permanent magnet has a pole capable of increasing the total magnetic flux generated in the module.
5. The rotor of claim 1 , wherein the modules are disposed on the rotor core spaced apart from an inner surface of the rotor core.
6. The rotor of claim 1 , wherein the modules are buried in the rotor core.
7. The rotor of claim 1 , wherein the first connection part comprises:
a center part comprising a permanent magnet; and
a remaining part comprising non-magnetic material or air.
8. The rotor of claim 1 , wherein the first connection part comprises non-magnetic material or air, and
wherein the rotor core comprises soft magnet material.
9. A motor comprising:
a rotor comprising a rotor core with a hole coupled to a shaft disposed at a center of the rotor;
a stator spaced apart from the rotor comprising at least one slot around which coil is wound; and
first modules and second modules alternately disposed next to each other with a gap of a constant width in the rotor core, each module comprising:
a pair of first permanent magnets spaced apart from each other;
a first connection part which connects ends of the first permanent magnets to each other;
a pair of second permanent magnets spaced apart from the first permanent magnets; and
a second connection part which connects the ends of the second permanent magnets to each other,
wherein the first permanent magnets of the first modules have an N pole on their sides facing the gap, while the first permanent magnets of the second modules have an S pole on their sides facing the gap, and
wherein the pair of second permanent magnets are magnetized with the same poles as the first permanent magnets.
10. The motor of claim 9 , wherein the first connection part connects the ends of the first permanent magnets adjacent to an inner surface of the rotor core to each other and the first connection part is spaced apart from the inner surface of the rotor core.
11. The motor of claim 9 , wherein the modules comprise:
a third permanent magnet which is disposed at an outer side of the rotor core between the first permanent magnets,
wherein the third permanent magnet has a pole capable of increasing the total magnetic flux generated in the module.
12. The rotor of claim 9 , wherein the modules are disposed on the rotor core spaced apart from an inner surface of the rotor core.
13. The motor of claim 9 , wherein the first connection part comprises:
a center part comprising permanent magnet; and
a remaining part comprising non-magnetic material or air.
14. The motor of claim 9 ,
wherein the first connection part comprises non-magnetic material or air, and
wherein the rotor core comprises soft magnet material.
15. A rotor core comprising:
a soft magnet material; and
first modules and second modules alternately disposed next to each other with a gap of a constant width in the rotor core, each module comprising:
a pair of first permanent magnets spaced apart from each other;
a first connection part which connects ends of the first permanent magnets to each other;
a pair of second permanent magnets spaced apart from the first permanent magnets; and
a second connection part which connects the ends of the second permanent magnets to each other,
wherein the first permanent magnets of the first modules have an N pole on their sides facing the gap, while the first permanent magnets of the second modules have an S pole on their sides facing the gap, and
wherein the pair of second permanent magnets are magnetized with the same poles as the first permanent magnets.
16. The rotor core of claim 15 , wherein the modules further comprise:
a third permanent magnet which is disposed at an outer side of the rotor core between the first permanent magnets,
wherein the third permanent magnet has a pole capable of increasing the total magnetic flux generated in the module.
17. The rotor of claim 15 , wherein the first connection part comprises:
a center part comprising a permanent magnet; and
a remaining part comprising non-magnetic material or air.
18. A set of modules for a rotor core comprising:
first modules and second modules alternately disposed next to each other with a gap of a constant width in the rotor core, each module comprising:
a pair of first permanent magnets spaced apart from each other;
a first connection part which connects ends of the first permanent magnets to each other;
a pair of second permanent magnets spaced apart from the first permanent magnets; and
a second connection part which connects the ends of the second permanent magnets to each other,
wherein the first permanent magnets of the first modules have an N pole on their sides facing the gap, while the first permanent magnets of the second modules have an S pole on their sides facing the gap, and
wherein the pair of second permanent magnets are magnetized with the same poles as the first permanent magnets.
19. The set of modules for a rotor core of claim 18 , wherein the modules further comprise:
a third permanent magnet which is disposed at an outer side of the rotor core between the first permanent magnets,
wherein the third permanent magnet has a pole capable of increasing the total magnetic flux generated in the module.
20. The set of modules for a rotor core of claim 18 , wherein the first connection part comprises:
a center part comprising a permanent magnet; and
a remaining part comprising non-magnetic material or air.