ELECTRIC MOTOR CAPABLE OF QUICK SHUTDOWN

Abstract

The present invention relates to a motor, in particular to a motor allowing for quick shutdown. A motor allowing for quick shutdown includes an enclosure, an end cover, a rotor, a magnet ring and a metal ring. The metal ring is made of permanent magnet material, and the magnet ring and the metal ring are adjacent to each other and can interact magnetically with each other. Several magnetic poles, of which N poles and S poles are staggered in the circumferential direction of the magnet ring, are formed on adjacent end faces or circumferential surfaces of the magnet ring and the metal ring. One of the magnet ring and the metal ring is coaxially fixed to the rotor, while the other one is fixed to the enclosure or the end cover. The present invention has the advantages that there is no dust caused by friction, which can effectively avoid the risk of motor jammed or shortened service life, and the motor can achieve quick shutdown and output a constant magnetic damping torque when in use.

Claims

1. A motor allowing for quick shutdown, comprising an enclosure, an end cover, a rotor, a magnet ring and a metal ring, wherein the metal ring is made of permanent magnet material, and the magnet ring and the metal ring are adjacent to each other and can interact magnetically with each other; several magnetic poles, of which N poles and S poles are staggered in the circumferential direction of the magnet ring, are formed on adjacent end faces or circumferential surfaces of the magnet ring and the metal ring; and one of the magnet ring and the metal ring is coaxially fixed to the rotor, while the other one is fixed to the enclosure or the end cover.

2. The motor allowing for quick shutdown according to claim 1, wherein the magnet ring and the metal ring are sleeved with each other, and the magnetic poles are formed on the circumferential surface of the magnet ring.

3. The motor allowing for quick shutdown according to claim 1, wherein the magnet ring and the metal ring are spaced in the axial direction of the rotor, and the magnetic poles are formed on the end face of the magnet ring.

4. The motor allowing for quick shutdown according to claim 1, wherein an axis of the magnet ring basically coincides with that of the metal ring.

5. The motor allowing for quick shutdown according to claim 1, wherein the axis of the magnet ring deviates from that of the metal ring.

6. The motor allowing for quick shutdown according to claim 1, wherein a hold-down groove, in which one of the magnet ring and the metal ring is fixed, is formed on an inner side of the end cover.

7. The motor allowing for quick shutdown according to claim 1, wherein a bearing housing for securing a bearing is formed on the inner side of the end cover, the stepped hold-down groove is provided at an opening of the bearing housing, and a rotor shaft of the rotor is rotatably fixed to the end cover through the bearing.

8. The motor allowing for quick shutdown according to claim 1, wherein one of the magnet ring and the metal ring is fixed to the rotor shaft of the rotor.

9. The motor allowing for quick shutdown according to claim 8, wherein a connecting ring is fixed outside the rotor shaft, and the magnet ring or the metal ring is fixed to an end face or a circumferential surface of the connecting ring.

10. The motor allowing for quick shutdown according to claim 9, wherein the connecting ring is made of magnetic conductive material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a structural diagram according to Embodiment 1 of the present invention;

[0018] FIG. 2 is a structural diagram according to Embodiment 2 of the present invention;

[0019] FIG. 3 is a structural diagram according to Embodiment 3 of the present invention; and

[0020] FIG. 4 is a damping characteristic diagram in use of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be further described as below with reference to the accompanying drawings by specific embodiments.

Embodiment 1

[0022] As shown in FIG. 1, a motor allowing for quick shutdown in the present invention comprises an enclosure 1, an end cover 2, a magnet ring 4, and a metal ring 5. A rotor having a rotor shaft 3 is rotatably fixed in the enclosure 1, the metal ring 5 is made of permanent magnet material, and the magnet ring 4 and the metal ring 5 are adjacent to each other and can interact magnetically with each other. Several magnetic poles, of which N poles and S poles are staggered in the circumferential direction of the magnet ring 4, are formed on adjacent circumferential surfaces of the magnet ring 4 and the metal ring 5. one of the magnet rings 4 and the metal ring 5 are coaxially fixed to the rotor, while the other one is fixed to the end cover 2.

[0023] The magnet ring 4 is coaxially fixed to the rotor shaft 3 of the rotor, and the metal ring 5 fixed to the end cover 2 is fixed in the enclosure 1. The magnet ring 4 and the metal ring 5 are sleeved with each other, wherein an axis of the metal ring 5 basically coincides with that of the magnet ring 4, and the metal ring 5 is sleeved on an outer circumferential side of the magnet ring 4. The metal ring 5 is made of permanent magnet alloy, and the magnet ring 4 is made of NdFeB.

[0024] A bearing housing 22 for securing a bearing 21 is formed on an inner side of the end cover 2, and a stepped hold-down groove is provided at an opening of the bearing housing 22. The rotor shaft 3 of the rotor is rotatably fixed to the end cover 2 through the bearing 21, and the metal ring 5 is fixed in the hold-down groove.

[0025] The magnet ring 4 is fixed to the rotor shaft 3 of the rotor through a connecting ring 31, the connecting ring 31 made of magnetic conductive material is fixed outside the rotor shaft 3, and the magnet ring 4 is fixed to a circumferential surface of the connecting ring 31.

[0026] As shown in FIG. 4, the magnet ring 4 keeps magnetizing the metal ring 5 when rotating, so the metal ring 5 made of permanent magnet alloy is magnetized to have the same number of pole pairs as the permanent magnet ring 4. As the magnet ring 4 rotates, the damping torque remains stable with time, and the metal ring 5 can keep a constant magnetic damping torque in this process.

Embodiment 2

[0027] As shown in FIG. 2, the difference between this embodiment and Embodiment 1 lies in that the magnet ring 4 and the metal ring 5 are spaced in the axial direction of the rotor, the magnetic poles are formed on an end face of the magnet ring 4, and there is an annular coincident face between the end face of the magnet ring 4 and the end face of the metal ring 5 after being projected in the axial direction of the rotor shaft.

Embodiment 3

[0028] As shown in FIG. 3, the difference between this embodiment and Embodiment 1 lies in that the metal ring 5 has the same circumferential width, and the axis of the metal ring deviates from that of the magnet ring 4. The connecting ring 31 is of a stepped structure, the rotor shaft 3 is provided with a stepped bulge 30 for confining the connecting ring 31, the connecting ring 31 to which the magnet ring 4 is tightly fitted, is tightly fitted to the rotor shaft. The connecting ring 31 is made of magnetic conductive material (optionally iron).

[0029] The advantages of the present invention are as follows. {circle around (1)} The motor in the present invention is of a magnetic damping structure and will produce no mechanical friction when in operation, so no mechanical noise will be generated, which can achieve the effect of completely low-noise or even completely silent, and enhance the use experience of the motor. {circle around (2)} There is no dust caused by friction, which can effectively avoid the risk of motor jammed or shortened service life. {circle around (3)} The motor can output constant damping torque to allow the long-term stable operation, and is suitable for occasions wherein the motor is required to keep still under the action of external force (such as gravity, and spring force of a mechanism) after the power is cut off, without any load slip or reverse slip on the rotor.