Outer rotor direct-drive permanent magnet synchronous motor for port crane

Abstract

The utility model discloses an outer rotor direct-drive permanent magnet synchronous motor for a port crane. The outer rotor direct-drive permanent magnet synchronous motor comprises a central shaft, a front mounting seat, a bearing, a front end cover, a stator winding, a stator iron core, a stator amplitude shaft, a permanent magnet, a rotor iron core, a winding drum, a rear end cover, a rear mounting seat and a winding outgoing line, the front end of the central shaft is fixed on the front mounting seat, the rear end of the central shaft is fixed on the rear mounting seat, the stator amplitude shaft is fixedly mounted in the middle of the central shaft, the stator core is fixedly mounted on the stator amplitude shaft, and the stator winding is distributed on the stator core; the rotor core is fixedly mounted on the inner wall of the winding drum; the permanent magnet is inserted into the rotor core; a front end cover is fixedly installed at the front end of the winding drum and assembled on the center shaft through a bearing, and a rear end cover is fixedly installed at the rear end of the winding drum and assembled on the center shaft through a bearing. One end of the central shaft is provided with a central blind hole, and a winding outgoing line is led out from the central blind hole. The device is reasonable in design and has good practical application value.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an outer rotor direct-drive permanent magnet synchronous motor for port cranes. Background Art

[0002] At present, the motor traction system mainly used in the crane hoisting mechanism can be divided into the following two categories:

[0003] First, three-phase asynchronous AC motor traction system: The three-phase asynchronous AC motor meets the performance and requirements of the crane hoisting mechanism through measures such as couplings and reducers.

[0004] Second, DC motor traction system: The mechanical characteristics of the DC motor are linear, with good speed regulation performance and more reliable operation.

[0005] The above two motors and traction systems both have reducers, which are relatively inefficient, prone to failure, have poor reliability, require frequent maintenance, and occupy a large space.

[0006] Existing technical solutions: At present, most of the traveling and hoisting motors of cranes in my country are driven by Y series asynchronous motors and reducers. The equipment is very large and noisy, the gearbox requires frequent maintenance, the speed regulation performance is poor, the positioning is inaccurate, and repeated jogging is required to achieve the desired effect.

[0007] Existing technical solutions have shortcomings: Traditional crane motor systems require a reduction gearbox, which is inefficient, prone to failure, unreliable, requires frequent maintenance, and occupies a large space. They also often use AC asynchronous motors, which have low efficiency and power factor, high starting current, and high power consumption. Traditional crane motor systems are inefficient, unreliable, consume a lot of power, and have low space utilization. Utility Model Content

[0008] In order to overcome the technical problems of low efficiency, difficult maintenance, poor starting performance and poor speed regulation performance of the existing crane motor traction system, the purpose of this utility model is to provide an outer rotor direct-drive permanent magnet synchronous motor for port cranes, which directly drives the load to work, can achieve low-speed and stable operation of the motor, and has good speed regulation performance.

[0009] The utility model is realized by adopting the following technical solutions:

[0010] A kind of port crane with outer rotor direct-drive permanent magnet synchronous motor, including center shaft, front mounting seat, bearing, front end cover, stator winding, stator core, stator width axis, permanent magnet, rotor core, drum, rear end cover, rear mounting seat, winding lead-out wire;The center shaft front end is fixed in front mounting seat, its rear end is fixed in rear mounting seat, the stator width axis is fixedly installed in the middle part of center shaft, the stator core is fixedly installed on stator width axis, and the stator winding is distributed on the stator core;The rotor core is fixedly installed on the inner wall of drum, and the permanent magnet is inserted into the rotor core;The drum front end is fixedly installed front end cover, and the front end cover is assembled on the center shaft by bearing, the drum rear end is fixedly installed rear end cover, and the rear end cover is assembled on the center shaft by bearing;One end of the center shaft is equipped with center blind hole, and the winding lead-out wire is led out from the center blind hole.

[0011] Further preferably, the stator width axis is connected to the middle part of the center shaft by a key.

[0012] Further preferably, the stator core is shrink-fitted on the stator width axis.

[0013] Further preferably, the rotor core is shrink-fitted on the drum.

[0014] Further preferably, the front end cover and the rear end cover are respectively connected to the drum by bolts.

[0015] Further preferably, an S-shaped water channel is arranged in the stator width axis, and the inlet and outlet pipelines of the S-shaped water channel are led out from the center blind hole.

[0016] Further preferably, the front end of the center shaft is connected to the front mounting seat by a key, and the rear end of the center shaft is connected to the rear mounting seat by a key.

[0017] Further preferably, the winding lead-out wire is connected to a frequency converter.

[0018] Compared with the prior art, the technical scheme provided by the utility model has the following advantages:

[0019] First, the permanent magnet synchronous motor cancels the speed reducer, the shaft coupling and the rotating rod, saves the space, and the structure is simpler and more practical, and the efficiency of the whole system is improved.

[0020] Second, the permanent magnet synchronous motor has high efficiency and power factor, which can reach 0.95-1, and the electric energy is greatly saved.

[0021] Third, the permanent magnet synchronous motor adopts the shell cooling mode of the S-shaped water channel, which can greatly reduce the temperature rise of the motor, reduce the volume of the motor, improve the operation efficiency, and enable the crane to start and run stably.

[0022] Fourthly, the permanent magnet synchronous motor of the present invention has smooth starting, good speed regulation performance, large starting torque and low operating noise.

[0023] The utility model has reasonable design and simple structure, reduces system cost (eliminating the reducer), improves system working efficiency, enhances system operation reliability, reduces maintenance difficulty, and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings herein are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 It shows the structural diagram of the present utility model.

[0027] In the figure: 1-center shaft, 2-front mounting seat, 3-bearing, 4-front cover, 5-stator winding, 6-stator core, 7-stator width shaft, 8-permanent magnet, 9-rotor core, 10-winding drum, 11-rear cover, 12-rear mounting seat, 13-lead wire, 14-center blind hole, 15-S-type water channel, 16-key, 17-bolt, 18-oblique hole. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0029] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] An outer rotor direct-drive permanent magnet synchronous motor for a port crane includes a central shaft 1, a front mounting seat 2, a bearing 3, a front end cover 4, a stator winding 5, a stator core 6, a stator width shaft 7, a permanent magnet 8, a rotor core 9, a drum 10, a rear end cover 11, a rear mounting seat 12, and a winding lead 13.

[0033] like Figure 1 As shown, the front end of the central shaft 1 is fixedly connected to the front mounting seat 2 via a key, and its rear end is fixedly connected to the rear mounting seat 12 via a key. The stator radial shaft 7 is fixedly connected to the middle of the central shaft 1 via a key 16, and the stator core 6 is fixedly mounted on the stator radial shaft 7 by shrink fit. The stator winding 5 is distributed on the stator core 6.

[0034] like Figure 1 As shown, the rotor core 9 is fixedly mounted to the inner wall of the drum 10 via shrink fit. The outer rotor directly drives the drum, eliminating components such as a reducer, coupling, and rotating rod. Permanent magnets 8 are inserted into the rotor core 9. The front end of the drum 10 is fixedly mounted with a front cover 4, which is assembled to the central shaft 1 via bearings 3. The rear end of the drum 10 is fixedly mounted with a rear cover 11, which is assembled to the central shaft 1 via bearings 3. In other words, the front cover 4 and rear cover 11 are each connected to the drum 10 via bolts 17.

[0035] like Figure 1 As shown, a central blind hole 14 is provided at one end (rear end) of the central shaft 1 , and the winding lead wire 13 passes through the inclined hole 18 and is led out from the central blind hole 14 , and the winding lead wire 13 is connected to the inverter.

[0036] like Figure 1 As shown, an S-shaped water channel 15 is provided in the stator width shaft 7 , and the water inlet and outlet pipes of the S-shaped water channel 15 pass through the inclined hole 18 and then lead out from the central blind hole 14 .

[0037] The permanent magnet synchronous motor described in this utility model is installed as follows: the center shaft 1 passes through the left and right bearings 3 and is fixed to the front mounting seat 2 and the rear mounting seat 12. The stator shaft 7 is connected to the center shaft 1 via a key 16. The stator core 6 is shrink-fitted onto the stator shaft 7. The stator winding 5 is distributed on the stator core 6. The permanent magnet 8 is inserted into the rotor core 9. The rotor core 9 is shrink-fitted onto the drum 10. The drum 10 is connected to the front cover 4 and the rear cover 11 with bolts 17. The winding lead wire 13 is passed through the center blind hole 14 of the center shaft 1. Finally, the inverter is connected to the permanent magnet synchronous motor through the winding lead wire 13. The stator shaft 7 has an S-shaped water channel 15, and its inlet and outlet pipes are also led out through the center blind hole 14 of the center shaft 1. The permanent magnet synchronous motor has more than 30 poles.

[0038] The utility model adopts a frequency converter for power supply, and the frequency converter is directly connected to the permanent magnet synchronous motor through a power supply lead 13 to realize variable frequency starting of the permanent magnet synchronous motor.

[0039] The above description is only a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.

Claims

1. An outer rotor direct-drive permanent magnet synchronous motor for a port crane, comprising a central shaft (1), a front mounting seat (2), a bearing (3), a front end cover (4), a stator winding (5), a stator core (6), a stator width shaft (7), a permanent magnet (8), a rotor core (9), a drum (10), a rear end cover (11), a rear mounting seat (12), and a winding lead wire (13); Its characteristics are: The front end of the central shaft (1) is fixed to the front mounting seat (2), and the rear end thereof is fixed to the rear mounting seat (12); the stator width shaft (7) is fixedly mounted on the middle part of the central shaft (1); the stator core (6) is fixedly mounted on the stator width shaft (7); and the stator winding (5) is distributed on the stator core (6); the rotor core (9) is fixedly mounted on the inner wall of the reel (10), and the permanent magnet (8) is inserted into the rotor core (9); the front end of the reel (10) is fixedly mounted with a front cover (4), and the front cover (4) is assembled on the central shaft (1) through a bearing (3); the rear end of the reel (10) is fixedly mounted with a rear cover (11), and the rear end cover (11) is assembled on the central shaft (1) through a bearing (3); a central blind hole (14) is provided at one end of the central shaft (1), and the winding lead wire (13) is led out from the central blind hole (14).

2. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The stator width shaft (7) is connected to the middle of the central shaft (1) via a key (16).

3. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The stator core (6) is thermally sleeved onto the stator width shaft (7).

4. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The rotor core (9) is thermally sleeved on the winding drum (10).

5. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The front end cover (4) and the rear end cover (11) are respectively connected to the reel (10) via bolts (17).

6. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: An S-shaped water channel (15) is provided in the stator width shaft (7), and the inlet and outlet pipes of the S-shaped water channel (15) are led out from the central blind hole (14).

7. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The front end of the central shaft (1) is connected to the front mounting seat (2) via a key, and the rear end thereof is connected to the rear mounting seat (12) via a key.

8. The outer rotor direct-drive permanent magnet synchronous motor for a port crane according to claim 1, characterized in that: The winding lead wire (13) is connected to the frequency converter.

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