MOTOR

Abstract

A motor includes a stator which generates a rotating magnetic field, and a rotor. The rotor includes a plurality of permanent magnets and a hysteresis band disposed on an outer periphery of the rotor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a schematic view of a conventional motor;

FIG. 2 is a graph illustrating a relationship between the torque and the speed of the conventional motor;

FIG. 3 is a schematic view of an embodiment of a motor according to the present invention; and

FIG. 4 is a graph illustrating a relationship between the torque and the speed of the motor of FIG. 3.

Claims

1. A motor, comprising: a stator which generates a rotating magnetic field; anda rotor, comprising a plurality of permanent magnets and a hysteresis band disposed on an outer periphery of the rotor.

2. The motor of claim 1, wherein the hysteresis band comprises a ring-shaped magnetic body.

3. The motor of claim 1, wherein the hysteresis band comprise a neodymium NdFeB bond magnet.

4. The motor of claim 1, wherein the hysteresis band generates a hysteresis torque which offsets a magnet torque generated by the plurality of permanent magnets.

5. The motor of claim 1, wherein the stator comprises a plurality of teeth defining a plurality of slots therebetween.

6. The motor of claim 5, wherein the plurality of teeth define a through hole formed in a center of the stator.

7. The motor of claim 6, wherein the rotor is disposed within the through hole.

8. The motor of claim 5, wherein the stator comprises a coil, wound around the plurality of teeth, which generates the rotating magnetic field when an electric current is applied thereto.

9. The motor of claim 1, wherein the rotor comprises an axle hole into which a rotating axle is inserted.

10. The motor of claim 9, wherein the plurality of permanent magnets are disposed around the axle hole.

11. The motor of claim 1, wherein an eddy current in the hysteresis band generates an eddy torque.

12. A motor, comprising: a stator, comprising a plurality of teeth defining a plurality of slots therebetween and a through hole formed in a center of the stator, and a coil wound around the teeth which generates a rotating magnetic field when an electric current is applied thereto; anda rotor disposed in the through hole, comprising an axle hole into which a rotating axle is inserted, a plurality of permanent magnets disposed around the axle hole, and a hysteresis band that is disposed on an outer periphery of the rotator, the hysteresis comprising a ring-shaped neodymium NdFeB bond magnet.

13. The motor of claim 12, wherein the hysteresis band generates a hysteresis torque which offsets a magnet torque generated by the plurality of permanent magnets.

14. The motor of claim 12, wherein an eddy current in the hysteresis band generates an eddy torque.