Fast-shutdown motor

Abstract

A fast-shutdown motor, comprising a rotor shaft (11). A rotor core (12) is fixed on the rotor shaft (11); the rotor shaft (11) is rotatably fixed to a motor housing by means of a bearing (2); the motor housing comprises an end cover part (3); an annular protrusion (31) extending in the axial direction is formed on the end cover part (3); the bearing (2) is provided in a space defined by the annular protrusion (31); a damping spring (4) is provided between the end cover part (3) and the rotor core (12); one end of the damping spring (4) is sleeved outside the annular protrusion (31) and is supported on the axial side of the end cover part (3), and a damping plate (5) is provided between the other end of the damping spring (4) and the rotor core (12); and the damping plate (5) is fixed directly or indirectly to the rotor core (12).

Description

Rapid stop motor Technical Field

[0001] The present invention relates to a motor, and in particular to a motor capable of rapid shutdown. Background Art

[0002] Chinese patent application number 201910494172.1 discloses a rotor assembly capable of achieving rapid shutdown. The assembly includes a rotor shaft, a rotor core secured to the rotor shaft, a bearing secured to the rotor shaft, and a compression spring disposed between the rotor core and the bearing. One end of the compression spring presses against the axial side of the outer ring of the bearing, while the other end presses against the axial side of the rotor core or is secured to the rotor core. When the motor is started, the rotor rotates after overcoming a relatively small spring resistance. When the motor is powered off, the resistance of the compression spring reduces the force pushing the rotor to rotate, thereby reducing the time required for the rotor to rotate after the motor is powered off, thus achieving rapid shutdown.

[0003] The above solution has the following defects: the compression spring is pressed against the bearing, and the bearing will be subjected to axial force, which will affect the bearing's pressure resistance, shorten the bearing's service life, reduce its operating stability, and also cause increased noise when the motor is used. Technical issues

[0004] The object of the present invention is to provide a motor with a quick stop function without bearings being affected by spring forces. Technical Solutions

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a motor with rapid shutdown, comprising a rotor shaft, a rotor core fixed on the rotor shaft, the rotor shaft being rotatably fixed to the motor housing via a bearing, the motor housing comprising an end cover portion, the end cover portion constituting an axially extending annular protrusion, a bearing being provided in the space enclosed by the annular protrusion, a damping spring being provided between the end cover portion and the rotor core, one end of the damping spring being sleeved outside the annular protrusion and supported on the axial side of the end cover portion, a damping plate being provided between the other end of the damping spring and the rotor core, the damping plate being directly or indirectly fixed to the rotor core.

[0006] The present invention causes the damping spring to apply axial force to the rotor core, so that when the motor stops (power off or receives a stop signal), the rotor is subjected to resistance, thereby reducing the number of revolutions the rotor has to make under the action of inertia, thereby achieving damping deceleration, and realizing rapid stopping of the rotor when the motor stops, thereby achieving the purpose of rapid shutdown.

[0007] The damping spring of the present invention is not supported on the bearing, but is supported on the end cover portion. The bearing located in the bearing chamber formed by the annular protrusion will not be subjected to the axial force applied by the damping spring. The service life of the bearing is longer, the use stability of the bearing is better, and the noise during the use of the motor is smaller.

[0008] The present invention provides a damping plate to protect the rotor core from direct force, thereby preventing wear of the rotor core, particularly wear of the end rings and counterweights at the rotor core end faces. The damping spring is a compression spring, and a conventional coil spring can be selected. The side of the damping plate adjacent to the damping spring should be machined to a smooth surface. The damping plate can be made of a wear-resistant metal material (such as 65Mn (PYB / T5058), steel plate 2-GB708-88, or steel plate 10-GB710-88).

[0009] Preferably, a linkage piece is provided at one end of the damping spring away from the annular protrusion. When the rotor shaft rotates, the linkage piece and the damping plate rotate relatively, and the damping plate rotates together with the rotor core.

[0010] The present invention provides a linkage to prevent twisting of the damping spring end, thereby improving the rotational stability between the existing damping spring and the damping plate. It also increases the effective contact area with the micro-convex peaks of the damping plate, thereby increasing frictional resistance. When both the linkage and the damping plate are made of metal, the contact surface between the linkage and the damping plate must be a mutually matching flat surface.

[0011] Preferably, the linkage member is made of a material different from that of the damping plate.

[0012] That is, when the damping plate is made of metal, the linkage can be made of plastic, thereby avoiding rigid friction between the two metal parts and further reducing noise during motor operation. The linkage can be made of wear-resistant plastic (such as PEEK plastic or phenolic laminated glass cloth).

[0013] Preferably, the linkage member includes a ring portion sleeved on the outside of the rotor shaft, the ring portion has an axially extending limiting protrusion, and the end of the damping spring is sleeved on the circumferential side of the limiting protrusion.

[0014] Preferably, the end of the damping spring is sleeved on the circumferential outside of the limiting protrusion.

[0015] The radial movement of the damping spring is limited by the limiting protrusion, thereby ensuring the stability of the damping spring during use. The limiting protrusion is located inwardly of the damping spring, which can reduce the consumables of the entire linkage and reduce the cost.

[0016] Preferably, the ring portion includes a first ring portion and a second ring portion along the axial direction, and the inner diameter of the first ring portion is greater than the inner diameter of the second ring portion.

[0017] This arrangement reduces the contact area between the linkage and the rotor shaft, facilitating relative rotation between the two. After installation, the linkage contacts the outer wall of the rotor shaft. However, as the rotor shaft rotates, the linkage adapts to centrifugal force, eliminating contact between the linkage and the rotor shaft.

[0018] Preferably, lubricating oil is provided between the linkage member and the damping plate.

[0019] During motor assembly, lubricating oil is applied between the linkage and the damping plate to facilitate adhesion and assembly. During initial motor startup, the lubricating oil reduces friction between the linkage and the damping plate, thereby reducing both startup requirements and noise. The amount of lubricating oil between the linkage and the damping plate should be applied as needed. If too much lubricating oil is applied, centrifugal force will squeeze out after a short while, preventing the motor from shutting down quickly.

[0020] Preferably, an annular groove is provided on the axial inner wall of the end cover portion, and the end of the damping spring is located in the annular groove.

[0021] By providing the annular groove, the circumferential inner wall of the annular groove contacts the circumferential outer wall of the damping spring, thereby limiting the radial movement of the damping spring away from the rotor core end, thereby ensuring stability in use.

[0022] Preferably, a fixing groove is formed on the axial inner wall of the end cover portion, and the end of the damping spring has a pin extending circumferentially outward or axially to extend into the fixing groove.

[0023] The fixing groove is provided to limit the pin at the end of the damping spring, thereby limiting the radial movement of the damping spring away from the rotor core end, thereby ensuring stability in use. Beneficial effects

[0024] The present invention has the advantages of preventing the bearing from being subjected to the action of the spring, thereby extending the service life of the bearing, improving the stability of the bearing during use, and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a cross-sectional view of the present invention.

[0026] Figure 2 is an enlarged view of point A in Figure 1

[0027] FIG3 is a schematic structural diagram of the end cover portion of the present invention. Best Mode for Carrying Out the Invention

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] As shown in Figures 1 to 3, this embodiment discloses a motor with rapid shutdown, comprising a rotor shaft 11, to which a rotor core 12 is fixed. In this embodiment, the rotor core 12 has a cast aluminum end ring 13 at its end. The rotor shaft 11 is rotationally fixed to the motor housing via a bearing 2. The motor housing includes an end cap 3, which comprises an axially extending annular projection 31. The bearing 2 is positioned within the space enclosed by the annular projection 31. A damping spring 4 is positioned between the end cap 3 and the rotor core 12. The bearing 2 located within the bearing chamber formed by the annular projection 31 is a ball bearing. An annular groove 30 is defined on the axial inner wall of the end cap 3, with the end of the damping spring 4 positioned within the annular groove 30.

[0030] One end of the damping spring 4 is sleeved over the annular protrusion 31 and supported on the axial surface of the annular groove 30. A damping plate 5 is interposed between the other end of the damping spring 4 and the rotor core 12. The damping plate 5 is tightly fitted and fixed to the rotor shaft 11. Ribs are punched on the rotor shaft 11, and the damping plate 5 is press-fitted onto the rotor shaft 11 so that the ribs 14 on the rotor shaft 11 contact the inner wall of the damping plate 5, and the end face of the damping plate 5 contacts the axial surface of the cast aluminum end ring 13.

[0031] A linkage member 6 is provided on the end of the damping spring 4 that is distal to the annular protrusion 31. When the motor starts normally to stabilize the rotation of the rotor shaft 11, the linkage member 6 and the damping plate 5 rotate relative to each other, causing the damping plate 5 to rotate along with the rotor core 12. The linkage member 6 includes an annular portion that fits over the rotor shaft 11 and has an axially extending stop protrusion 62. The end of the damping spring 4 that is distal to the annular protrusion 31 fits circumferentially outside the stop protrusion 62.

[0032] The ring portion axially comprises a first ring portion 611 and a second ring portion 612. The inner diameter of the first ring portion 611 is larger than that of the second ring portion 612. The ribs 14 on the rotor shaft 11 are located within the first ring portion 611. A small amount of lubricating oil is provided between the linkage member 6 and the damping plate 5 to bond the linkage member 6 and the damping plate 5 together.

[0033] In this embodiment, a fixing groove 60 is formed on the axial inner wall of the end cap portion 3 and the axial end surface of the limiting protrusion 62 of the linkage member 6. One end of the damping spring 4 has a pin 41 extending circumferentially outward, while the other end of the damping spring 4 has a pin 41 extending circumferentially inward. The pin 41 extending circumferentially outward fits within the fixing groove 60 of the end cap portion 3, while the other pin fits within the mating groove of the linkage member 6. The lateral opening of the fixing groove 60 should be rounded to prevent interference between the bend between the damping spring 4 and the pin and the lateral opening of the fixing groove 60.

[0034] This embodiment has the advantages of freeing the bearing from the force of the spring, thereby extending the service life of the bearing, improving the stability of the bearing during use, and reducing noise.

Claims

1. A motor with rapid shutdown, comprising a rotor shaft, a rotor core being fixed on the rotor shaft, the rotor shaft being rotatably fixed to a motor housing through a bearing, characterized in that: The motor housing includes an end cover part, which is composed of an axially extending annular protrusion. A bearing is arranged in the space surrounded by the annular protrusion. A damping spring is arranged between the end cover part and the rotor core. One end of the damping spring is sleeved outside the annular protrusion and supported on the axial side of the end cover part. A damping plate is arranged between the other end of the damping spring and the rotor core. The damping plate is directly or indirectly fixed to the rotor core.

2. The motor with rapid shutdown according to claim 1, characterized in that: A linkage piece is provided at one end of the damping spring away from the annular protrusion. When the rotor shaft rotates, the linkage piece and the damping plate rotate relatively, and the damping plate rotates together with the rotor core.

3. The motor with rapid stop according to claim 2, characterized in that: The linkage member is made of a material different from that of the damping plate.

4. The motor with rapid stop according to claim 2, characterized in that: The linkage member comprises a ring portion sleeved outside the rotor shaft, the ring portion has an axially extending limiting protrusion, and the end of the damping spring is sleeved on the circumferential side of the limiting protrusion.

5. The motor with rapid stop according to claim 3, characterized in that: The end of the damping spring is sleeved on the circumferential outer side of the limiting protrusion.

6. The motor with rapid stop according to claim 3, characterized in that: The ring portion includes a first ring portion segment and a second ring portion segment along the axial direction, and the inner diameter of the first ring portion segment is greater than the inner diameter of the second ring portion segment.

7. The motor with rapid stop according to claim 2, characterized in that: Lubricating oil is provided between the linkage member and the damping plate.

8. The motor with rapid stop according to claim 1, characterized in that: An annular groove is provided on the axial inner wall of the end cover portion, and the end of the damping spring is located in the annular groove.

9. The motor with rapid stop according to claim 1, characterized in that: A fixing groove is formed on the axial inner wall of the end cover part, and the end of the damping spring has a pin extending circumferentially outward or axially to extend into the fixing groove.

Images