Direct-drive permanent magnet synchronous motor for pulper

Abstract

The direct-drive permanent magnet synchronous motor comprises an upper end cover assembly, a rotor assembly, a stator assembly, a lower flange assembly and a junction box, the bottom of the stator assembly is installed on the lower flange assembly, the upper end of the rotor assembly penetrates through the stator assembly and the upper end cover assembly, the upper end of the stator assembly is provided with the upper end cover assembly, and the lower flange assembly is installed on the junction box. The junction box is installed on the stator assembly, a motor power supply outgoing line is connected with the stator winding through the junction box, the stator assembly further comprises a machine base and a stator iron core, a turn-back cooling water channel is arranged in the machine base, the machine base comprises a water channel partition plate, a machine base inner wall and a machine base outer wall, and the machine base outer wall is provided with a water inlet and a water outlet. The water inlet and the water outlet are connected with the two ends of the turn-back cooling water path. According to the utility model, the transmission structure is simplified, and the maintenance cost is reduced; the heat dissipation capability is enhanced, and the power density of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric motor technology, specifically a direct-drive permanent magnet synchronous motor for a pulper. Background Technology

[0002] A pulper is a device used to break down various fibrous raw materials (such as wood, bamboo, reeds, waste paper, etc.) into a fibrous suspension. Its basic principle is to use mechanical action, such as rotating blades, rotors, or grinding discs, to cut, tear, rub, and agitate the raw materials, breaking down the bonds between the fibers and thus turning them into fiber pulp. For example, in the paper industry, a pulper can revert waste paper back into pulp, providing raw materials for subsequent papermaking processes. Traditional pulpers use an asynchronous motor and a reducer for drive, such as... Figure 1 Traditional pulping equipment occupies a large space, has many mechanical transmission links, resulting in high system losses and low energy efficiency. The numerous transmission links also lead to a heavy workload for the maintenance and repair of the reducer. With increasing service life, problems such as oil leaks in the reducer are inevitable. If the reducer is imported, routine maintenance and spare parts are expensive, and some parts need to be custom-made from abroad, resulting in long lead times, high costs, and impacts on production schedules. Traditional asynchronous motors use air cooling, which has limited heat dissipation capacity, leading to a higher material usage and lower power density in the motor body. Furthermore, the reducer lacks bearing temperature and vibration detection components, making it difficult to detect abnormalities in the equipment's operating status in a timely manner. Utility Model Content

[0003] The purpose of this utility model is to solve the problems mentioned in the background art. This utility model provides a direct-drive permanent magnet synchronous motor for pulpers, which simplifies the transmission structure, reduces maintenance costs, enhances heat dissipation, and increases the power density of the motor.

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0005] A direct-drive permanent magnet synchronous motor for a pulper includes an upper end cover assembly, a rotor assembly, a stator assembly, a lower flange assembly, and a junction box. The bottom of the stator assembly is mounted on the lower flange assembly, the upper end of the rotor assembly passes through the stator assembly and the upper end cover assembly, the upper end cover assembly is mounted on the upper end of the stator assembly, and the junction box is mounted on the stator assembly. The motor power lead is connected to the stator winding through the junction box. The stator assembly also includes a frame and a stator core. A folding cooling water channel is provided inside the frame. The frame includes a water channel baffle, an inner wall of the frame, and an outer wall of the frame. The outer wall of the frame has a water inlet and a water outlet, which are connected to the two ends of the folding cooling water channel.

[0006] Furthermore, the water channel baffle is located inside the inner wall and outer wall of the machine base. The water channel baffle includes a first baffle and a second baffle. Multiple circumferentially distributed first baffles and multiple circumferentially distributed second baffles are provided inside the machine base. The first baffle and the second baffle are spaced apart. The height of the first baffle and the second baffle is less than the height of the machine base.

[0007] Furthermore, the inner bore of the frame is connected to the stator core via a hot-fit interference fit.

[0008] Furthermore, self-aligning roller bearings and tapered roller bearings are respectively installed in the middle of the upper end cover assembly and the lower flange assembly. The upper end of the rotor assembly is installed at the self-aligning roller bearing, and the lower end of the rotor assembly is installed at the tapered roller bearing.

[0009] Furthermore, the stator winding is equipped with 6 PT100 temperature sensing elements, and the self-aligning roller bearing and the tapered roller bearing are each equipped with 1 PT100 temperature sensing element and 1 vibration sensor.

[0010] Furthermore, the top of the rotor assembly is connected to the bottom of the pulper's rotating shaft via a coupling.

[0011] Furthermore, the outer wall of the base is provided with several circumferentially distributed reinforcing rods and a motor moving plate, and the motor moving plate is provided with moving holes.

[0012] Beneficial effects:

[0013] This invention enables direct connection between the motor and the pulper, simplifies the transmission structure, eliminates the notoriously difficult reducer for equipment maintenance, and effectively solves the pain points of traditional pulper maintenance. This invention also improves the stator assembly by setting a folding cooling water channel inside the stator assembly's base, thereby improving the motor's heat dissipation capacity and saving on the amount of material used in the motor body. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of existing technology;

[0016] Figure 2 This is a schematic diagram illustrating an embodiment of the present invention.

[0017] Figure 3 This is an exploded view of an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of an embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of the folding cooling water circuit of the base according to an embodiment of the present invention;

[0020] Figure 6 This is a top view of the base of an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the fit between the frame and the stator core according to an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram showing the connection between the rotor assembly and the self-aligning roller bearing and the tapered roller bearing in one embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0024] As shown in the figure, this utility model discloses a direct-drive permanent magnet synchronous motor for a pulper, including an upper end cover assembly 1, a rotor assembly 2, a stator assembly 3, a lower flange assembly 4, and a junction box 5. The bottom of the stator assembly 3 is mounted on the lower flange assembly 4. The upper end of the rotor assembly 2 passes through the stator assembly 3 and the upper end cover assembly 1. The upper end cover assembly 1 is mounted on the upper end of the stator assembly 3. The junction box 5 is mounted on the stator assembly 3. The motor power lead is connected to the stator winding through the junction box 5. The stator assembly also includes a frame 6 and a stator core 7. The frame 6 is provided with a folding cooling water channel. The frame 6 includes a water channel baffle, an inner wall 61, and an outer wall 62. The outer wall 62 is provided with a water inlet 8 and a water outlet 9. The water inlet 8 and the water outlet 9 are connected to the two ends of the folding cooling water channel. This utility model eliminates the speed reducer. The output end of the rotor assembly 2 is directly connected to the shaft of the pulper 15 through the coupling 14. The rotor assembly 2 and the pulper 15 are directly driven, which simplifies the transmission mechanism, improves transmission efficiency, and achieves the purpose of energy saving and consumption reduction.

[0025] This invention eliminates the speed reducer and intermediate transmission components, making the transmission system nearly maintenance-free and reducing maintenance costs.

[0026] The lower flange assembly 4 is installed on the bottom foundation of the original equipment.

[0027] To ensure the replacement motor maintains the same speed as before (the original was a 4-pole asynchronous motor with a speed of 1485 r / min and a reducer speed ratio of 8, resulting in a reducer output speed of 1485 / 8 = 185.6 r / min), this invention fully utilizes the advantages of permanent magnet motors in low-speed, high-torque operation. The motor is designed with 40 poles, a rated frequency of 61.7 Hz, and a rated speed of 185 rpm. Furthermore, through frequency conversion control, the motor speed can be steplessly adjusted within the range of 0-220 r / min, better adapting to on-site process requirements and achieving optimal energy efficiency.

[0028] In one embodiment of this utility model, a water channel baffle is located within the inner wall 61 and outer wall 62 of the base. The water channel baffle includes a first baffle 10 and a second baffle 11. Multiple circumferentially distributed first baffles 10 and multiple circumferentially distributed second baffles 11 are provided within the base 6. The first baffles 10 and second baffles 11 are spaced apart, and their heights are less than the height of the base. The first baffles 10 and second baffles 11 form a zigzag cooling water channel, and the cooling water movement path is as follows: Figure 5 As indicated by the middle arrow.

[0029] In one embodiment of this utility model, the inner bore of the frame 6 and the stator core 7 are connected by a thermal interference fit, which effectively improves the thermal conductivity between the frame and the stator core.

[0030] In one embodiment of this utility model, a self-aligning roller bearing 12 and a tapered roller bearing 13 are respectively installed at the middle of the upper end cover assembly 1 and the lower flange assembly 4. The upper end of the rotor assembly 2 is installed at the self-aligning roller bearing 12, and the lower end of the rotor assembly 2 is installed at the tapered roller bearing 13. The upper end of the rotor assembly 2 uses a self-aligning roller bearing (6) to bear the load and the radial load of the body, and the lower end of the rotor assembly 2 uses a tapered roller bearing (7) to bear the axial load such as the weight of the rotor and a part of the radial load.

[0031] In one embodiment of this invention, six PT100 temperature sensing elements are arranged on the stator winding, and one PT100 temperature sensing element and one vibration sensor are arranged on each of the self-aligning roller bearing 12 and the tapered roller bearing 13. This allows for monitoring of temperature changes in the motor windings and bearings, as well as vibration velocity changes at the bearings. Alarm and shutdown values ​​can be set for the winding and bearing temperatures and vibration values ​​respectively, enabling alarm and shutdown in case of any abnormality during motor operation.

[0032] Motor windings: Alarm value: 125℃; Stop value: 135℃

[0033] Bearing: Alarm value: 85℃; Shutdown value: 95℃

[0034] Vibration velocity: Alarm value: 2.3m / s, Stop value: 2.8m / s.

[0035] In one embodiment of the present invention, the top of the rotor of the rotor assembly 2 is connected to the bottom of the rotating shaft of the pulper 15 via a coupling 14.

[0036] In one embodiment of this utility model, the outer wall 62 of the base is provided with a plurality of circumferentially distributed reinforcing rods 63 and a motor moving plate 64, and the motor moving plate 64 is provided with a moving hole 641. When it is necessary to move this utility model, it is hoisted at the moving hole using a hook.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A direct-drive permanent magnet synchronous motor for a pulper, characterized in that, The device includes an upper end cover assembly, a rotor assembly, a stator assembly, a lower flange assembly, and a junction box. The bottom of the stator assembly is mounted on the lower flange assembly. The upper end of the rotor assembly passes through the stator assembly and the upper end cover assembly. The upper end cover assembly is mounted on the upper end of the stator assembly. The junction box is mounted on the stator assembly. The motor power lead is connected to the stator winding through the junction box. The stator assembly also includes a frame and a stator core. The frame is equipped with a folding cooling water channel. The frame includes a water channel baffle, an inner wall, and an outer wall. The outer wall has an inlet and an outlet, which are connected to the two ends of the folding cooling water channel.

2. The direct-drive permanent magnet synchronous motor for a pulper according to claim 1, characterized in that, The water channel baffle is located inside the inner wall and outer wall of the machine base. The water channel baffle includes a water baffle plate one and a water baffle plate two. Multiple water baffle plates one and multiple water baffle plates two are arranged in a circle inside the machine base. The water baffle plates one and two are spaced apart. The height of the water baffle plates one and two is less than the height of the machine base.

3. The direct-drive permanent magnet synchronous motor for a pulper according to claim 1, characterized in that, The inner bore of the frame is connected to the stator core by a hot-fit interference fit.

4. The direct-drive permanent magnet synchronous motor for a pulper according to claim 1, characterized in that, Self-aligning roller bearings and tapered roller bearings are respectively installed in the middle of the upper end cover assembly and the lower flange assembly. The upper end of the rotor assembly is installed at the self-aligning roller bearing, and the lower end of the rotor assembly is installed at the tapered roller bearing.

5. A direct-drive permanent magnet synchronous motor for a pulper according to claim 4, characterized in that, The stator winding is equipped with 6 PT100 temperature sensing elements, and the self-aligning roller bearing and the tapered roller bearing are each equipped with 1 PT100 temperature sensing element and 1 vibration sensor.

6. A direct-drive permanent magnet synchronous motor for a pulper according to claim 1, characterized in that, The top of the rotor assembly is connected to the bottom of the pulper's rotating shaft via a coupling.

7. A direct-drive permanent magnet synchronous motor for a pulper according to claim 1, characterized in that, The outer wall of the base is provided with several circumferentially distributed reinforcing rods and a motor moving plate, and the motor moving plate is provided with moving holes.

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