A high-efficiency energy-saving controller for a wound-type three-phase motor

Abstract

The application discloses a high-efficiency energy-saving controller for a winding type three-phase motor and particularly relates to the technical field of motor control, which comprises a base, a mounting frame, a conveying device, a three-phase motor, a speed regulator, a control knob, a supporting column, a floating sleeve and a floating supporting mechanism. When the feeding end of the conveying device is placed with materials, the conveying device can overcome the resistance of the floating supporting mechanism and move downward to drive the floating sleeve to move downward. The application is provided with the supporting column, the floating sleeve, the floating supporting mechanism and the rotating mechanism. When the feeding end of the conveying device is placed with materials, the conveying device is subjected to the gravity of the materials and swings downward along the rotating fulcrum of the base, so that the floating supporting mechanism drives the floating sleeve to move downward, and then the rotating mechanism drives the control knob of the speed regulator to rotate, thereby automatically adjusting the rotation of the control knob when the conveying device is conveying materials, automatically adjusting the rotating speed of the three-phase motor and avoiding human intervention.

Description

Technical Field

[0001] This invention relates to the field of electric motor control technology, and more specifically, to a high-efficiency energy-saving controller for a wound-rotor three-phase electric motor. Background Technology

[0002] A three-phase motor is an AC motor driven by three-phase alternating current. When three-phase AC current is applied to the three stator windings (each phase differing by 120 electrical degrees), a rotating magnetic field is generated. This rotating magnetic field cuts the rotor windings to generate electricity. It includes three-phase synchronous motors and three-phase asynchronous motors. Wound-rotor three-phase motors are commonly used as drive elements in conveyor equipment, driving the conveyor to transport materials.

[0003] A search revealed Chinese Patent No. CN108777534A, which discloses a variable frequency speed control device for a three-phase asynchronous motor. The device includes a limit slot, a variable frequency speed controller, wooden dowels, and a limit block. The variable frequency speed controller consists of a main unit housing and a maintenance door, with the maintenance door located at the back of the main unit housing. The limit slot and limit block allow for quick installation of the variable frequency speed controller into the connecting block on top of the three-phase asynchronous motor, and it is secured with wooden dowels. This makes installation and disassembly of the variable frequency speed controller extremely convenient. The overall structure is very simple, resulting in extremely low production costs and significantly increasing production speed. Furthermore, the maintenance door, used as a medium to connect to the three-phase asynchronous motor, allows for easy maintenance and replacement of internal electrical components even without removing the speed controller, simply by flipping the main unit housing. This makes the maintenance and use of the entire device highly convenient.

[0004] In the aforementioned prior art speed control devices, manual rotation of a knob is usually required to adjust the motor speed. However, in actual operation, the applicant found that the motor speed needs to be adjusted according to the amount of material on the conveying equipment. That is, when there is little material, the motor usually needs to rotate at a low speed to reduce energy consumption, while when there is a lot of material on the conveying equipment, the motor needs to rotate at a medium to high speed to reduce energy consumption. Because the motor speed needs to be controlled manually by rotating the knob, it is impossible to automatically adjust the motor speed according to the amount of material on the conveying equipment, which results in a delay in motor speed adjustment and reduces work efficiency. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a high-efficiency energy-saving controller for wound-rotor three-phase motors. The technical problem to be solved by the present invention is that the motor speed control equipment in the prior art cannot adjust the motor speed according to the amount of material on the conveying equipment, resulting in high motor energy consumption.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wound-rotor type three-phase motor high-efficiency energy-saving controller, comprising a base, a mounting frame rotatably connected to one end of the base, a conveying device mounted on the mounting frame, the discharge end of the conveying device corresponding to the rotation fulcrum of the mounting frame on the base, the conveying device being driven to rotate by a three-phase motor, a speed regulator mounted on the base, the speed regulator having a control knob for adjusting the speed of the three-phase motor, and further comprising:

[0007] A support column is vertically fixed to the base and corresponds to the inlet end of the conveying equipment;

[0008] The floating sleeve is movably fitted onto the support column and can slide freely up and down;

[0009] A floating support mechanism is used to connect the floating sleeve and the mounting frame, and to support the side of the mounting frame adjacent to the feed end of the conveying equipment. When material is placed on the feed end of the conveying equipment, the conveying equipment can overcome the resistance of the floating support mechanism and move downward, thereby driving the floating sleeve to move downward.

[0010] A rotating mechanism is used to synchronously drive the control knob to rotate when the floating sleeve moves up and down, so as to adjust the speed of the three-phase motor.

[0011] In the aforementioned high-efficiency energy-saving controller for a wound-rotor three-phase motor, the floating support mechanism includes:

[0012] A reset spring is fitted onto the support column, and its two ends elastically abut against the floating sleeve and the base, respectively, in the direction of the elastic force.

[0013] The hinge rod is hinged at both ends to the floating sleeve and the mounting bracket, respectively.

[0014] In the above-described high-efficiency energy-saving controller for a wound-rotor three-phase motor, a limit nut is fitted onto the upper end of the support column.

[0015] In the high-efficiency energy-saving controller for a wound-rotor three-phase motor as described above, the rotating mechanism includes:

[0016] The fixed arm is fixedly connected to the base;

[0017] A rotating rod is rotatably connected to the upper end of the fixed arm;

[0018] A floating arm is fixed to the outer wall of the floating sleeve, and a sliding pin is provided on the floating arm. A waist-shaped hole is opened at one end of the rotating rod near the floating sleeve. The sliding pin is inserted into the waist-shaped hole and can slide in the waist-shaped hole.

[0019] An arc-shaped rack is fixed to the other end of the rotating rod, and the center of the arc of the rack is coaxial with the pivot point of the rotating rod on the fixed arm.

[0020] A gear is fixedly mounted on the control knob, and the gear meshes with an arc-shaped rack.

[0021] In the above-described high-efficiency energy-saving controller for a wound-rotor three-phase motor, the lateral distance between the rotation fulcrum of the rotating rod on the fixed arm and the sliding pin and control knob is defined as L1 and L2, respectively, with L2 being greater than L1.

[0022] In the above-described high-efficiency energy-saving controller for a wound-rotor three-phase motor, a connecting seat is provided on the mounting bracket, the three-phase motor is mounted on the connecting seat, and the motor shaft of the three-phase motor penetrates the connecting seat and is connected to the conveying equipment. A connecting cavity is provided inside the connecting seat, and an air inlet and an air outlet are provided on the outer wall of the connecting seat.

[0023] In the above-described high-efficiency energy-saving controller for a wound-rotor three-phase motor, a hollow sealing seat is fixedly connected to the connecting seat. A protrusion is provided on the outer wall of the sealing seat, and a connecting groove penetrating into the interior of the sealing seat is opened in the protrusion. The longitudinal section of the connecting groove is rectangular. The air inlet communicates with the connecting groove. A piston that can slide freely up and down is engaged inside the sealing seat. The axial length of the piston matches the longitudinal length of the connecting groove. Multiple through-hole-shaped slots are opened on the end face of the piston. A through hole penetrating the sealing seat is opened on the outer wall of the connecting seat. A drive rod is coaxially fixed to the piston. The drive rod extends out of the bottom of the sealing seat and can slide freely. The lower end of the drive rod contacts the base.

[0024] In the above-described high-efficiency energy-saving controller for a wound-rotor three-phase motor, a telescopic spring is installed inside the sealing seat. The telescopic spring elastically abuts against the piston and drives the piston to move downward.

[0025] The technical effects and advantages of this invention are as follows:

[0026] 1. This invention, by setting up a support column, a floating sleeve, a floating support mechanism, and a rotating mechanism, allows the conveying equipment to swing downwards along the rotation fulcrum of the base when material is placed at the inlet end of the conveying equipment due to the gravity of the material. This causes the floating support mechanism to drive the floating sleeve to move downwards, and the rotating mechanism to drive the control knob of the speed regulator to rotate. This enables the automatic adjustment of the control knob rotation when the conveying equipment is conveying material, thereby automatically adjusting the speed of the three-phase motor without human intervention.

[0027] 2. By setting a return spring and a hinge rod, when material is placed on the conveying equipment, the hinge rod will drive the floating sleeve to move downward and compress the return spring. Then, the return spring will elastically push against the floating sleeve, so that when the conveying equipment is unloaded, the mounting frame can automatically move upward and reset.

[0028] 3. By setting up a connecting seat, an air inlet and an air outlet, the present invention cools the motor shaft of the three-phase motor and reduces the heat loss of the bearings on the three-phase motor by setting up a connecting seat, an external air compression device delivers compressed air from the air inlet to the connecting seat and then flows out from the air outlet.

[0029] 4. This invention, by setting up a piston, a drive rod, and a sealing seat, allows the conveying equipment to swing downwards when material is placed on it. The drive rod is blocked by the base, causing the piston to move upwards. As the downward swing amplitude of the conveying equipment varies, the upward stroke of the piston also varies, thus allowing the opening of the connecting groove to be adjusted autonomously. Furthermore, by adjusting the amount of compressed air entering the sealing seat from the air inlet, the cooling effect on the three-phase motor shaft can be adjusted. As the amount of material increases, the opening amplitude of the connecting groove increases, making the amount of air entering the connecting seat proportional to the amount of material, thereby enabling autonomous adjustment of the cooling effect on the three-phase motor shaft. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention;

[0031] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure at point A;

[0032] Figure 3 This is a side view of the structure of a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention.

[0033] Figure 4 This is a side view schematic diagram of the structure of a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention;

[0034] Figure 5This is a schematic diagram of the sealing seat in a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention;

[0035] Figure 6 This is a cross-sectional schematic diagram of the sealing seat in a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention;

[0036] Figure 7 for Figure 6 Enlarged schematic diagram of the local structure at point B;

[0037] Figure 8 This is a side view schematic diagram of the sealing seat structure in a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention;

[0038] Figure 9 This is a schematic diagram of the arc-shaped rack in a high-efficiency energy-saving controller for a wound-rotor three-phase motor according to the present invention.

[0039] The attached figures are labeled as follows: 1-speed controller, 2-three-phase motor, 3-conveying equipment, 4-mounting bracket, 5-base, 6-hinge rod, 7-limit nut, 8-support column, 9-floating arm, 10-rotating rod, 11-arc rack, 12-gear, 13-control knob, 14-fixed arm, 15-reset spring, 16-floating sleeve, 17-air inlet, 18-drive rod, 19-sealing seat, 20-connecting seat, 21-air outlet, 22-protrusion, 23-connecting cavity, 24-piston, 25-connecting groove, 26-telescopic spring, 27-through groove, 28-slender hole. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1-9As shown, this invention provides a high-efficiency energy-saving controller for a wound-rotor three-phase motor, including a base 5. A mounting frame 4 is rotatably connected to one end of the base 5. A conveying device 3 is mounted on the mounting frame 4. The conveying device 3 can be a conveyor belt structure as in the prior art. The discharge end of the conveying device 3 corresponds to the rotation fulcrum of the mounting frame 4 on the base 5. The conveying device 3 is driven to rotate by a three-phase motor 2. A speed regulator 1 is mounted on the base 5. The speed regulator 1 has a control knob 13 for adjusting the speed of the three-phase motor 2. When the control knob 13 is rotated clockwise, the speed of the three-phase motor 2 increases. In this embodiment, the speed regulation principle of the speed regulator for the three-phase motor is prior art and will not be elaborated here. Additionally, a support column 8 is vertically welded to one side of the base 5 corresponding to the inlet end of the conveying device 3. A floating sleeve 16 is movably fitted on the support column 8. The floating sleeve 16 and the support column 8 form a sliding fit. The outer edge of the floating sleeve 16... Two hinge rods 6 are pivotally connected by a pivot, and the upper ends of the two hinge rods 6 are hinged to the mounting frame 2. When the conveying device 3 swings downward along the rotation fulcrum with the base 5, the hinge rods 6 will cause the floating sleeve 16 to slide downward. In addition, a return spring 15 is wrapped around the support column 8. The two ends of the return spring 15 elastically abut against the floating sleeve 16 and the base 5 respectively. When there is material at the feed end of the conveying device 3, the feed end of the conveying device 3 will swing downward along the rotation fulcrum with the base 5 due to the influence of the material's gravity, so that the floating sleeve 16 can slide downward and compress the return spring 15. In addition, when the material is conveyed, the return spring 15 will change from the compressed state to the extended state and drive the floating sleeve 16 to move upward, so that the mounting frame moves upward and resets. In addition, a limit nut 7 is fitted on the upper end of the support column 8 to limit the upward movement of the floating sleeve 16.

[0042] Depend on Figure 1 , 2As shown in Figures 4 and 5, when the conveying equipment 3 is unloaded, the three-phase motor 2 needs to maintain a low speed. However, when materials are placed on the conveying equipment 3, the speed of the three-phase motor 2 needs to increase to enable the conveying equipment 3 to convey the materials. Therefore, in this embodiment, a fixed arm 14 is welded to one side of the base 5 corresponding to the feed end of the conveying equipment 3. The upper end of the fixed arm 14 is rotatably connected to a rotating rod 10 via a mounting pin. A floating arm 9 is welded to the outer wall of the floating sleeve 16, and a sliding pin passes through the floating arm 9. A waist-shaped hole 28 is opened at one end of the rotating rod 10 adjacent to the floating sleeve 16. The sliding pin is inserted into the waist-shaped hole 28 and can slide within the waist-shaped hole 28. The length direction of the waist-shaped hole 28 is parallel to the length direction of the rotating rod. An arc-shaped rack 11 is welded to the end of the rotating rod 10 away from the conveying equipment 3. Furthermore, the arc center of the arc rack 11 is coaxial with the rotation fulcrum of the rotating rod 10 on the fixed arm 14. A gear 12 is fixedly mounted on the control knob 13, and the gear 12 meshes with the arc rack 11. When material is placed at the feed end of the conveying device 3, the feed end of the conveying device 3 will swing downward under the action of gravity of the material, and drive the sliding pin to slide in the waist-shaped hole, thereby driving the rotating rod to swing along the rotation fulcrum of the fixed arm. At the same time, the arc rack 11 swings counterclockwise, thereby driving the gear to rotate clockwise. This causes the control knob 13 to rotate and increases the speed of the three-phase motor, thereby realizing the automatic adjustment of the speed of the three-phase motor when the conveying device 3 is conveying material. In addition, the speed of the three-phase motor can be automatically adjusted according to the increase of the material quantity, realizing the autonomous adjustment of the speed of the three-phase motor.

[0043] like Figure 2 As shown, since the weight of the material is usually not too large, the downward swing amplitude of the conveying device 3 due to the weight of the material is not too large. This results in a small downward stroke of the floating sleeve, making it difficult to adjust the control knob. Therefore, in this embodiment, the lateral distance between the rotation fulcrum of the rotating rod 10 on the fixed arm 14 and the sliding pin and the control knob 13 is defined as L1 and L2, respectively, with L2 being greater than L1. Based on the lever principle, this allows the downward stroke of the floating sleeve to be amplified, thus making it easier to rotate the control knob to adjust the speed of the three-phase motor.

[0044] like Figure 5 , 6As shown in Figures 7 and 8, when the material on the conveying device 3 is conveyed, the three-phase motor 2 starts to rotate and convey the material. As is known, the motor shaft of the three-phase motor is rotatably mounted on the three-phase motor through a bearing. As the conveying proceeds, the bearing will accumulate heat, resulting in greater heat loss and affecting the rotation of the motor shaft. Therefore, in this embodiment, a connecting seat 20 is welded or screwed onto the mounting bracket 4. The three-phase motor 2 is mounted on the connecting seat 20, and the motor shaft of the three-phase motor 2 penetrates the connecting seat 20 and is connected to the conveying device 3. A connecting cavity 23 is provided inside the connecting seat 20, and an air inlet 17 and an air outlet 21 are provided on the outer wall of the connecting seat 20. The air compression device delivers compressed air from the air inlet to the connecting seat and then out through the air outlet to cool the motor shaft of the three-phase motor. Based on the principle of heat transfer, the motor shaft can absorb the heat of the bearing after cooling, thereby reducing the heat loss of the bearing on the three-phase motor.

[0045] like Figure 5 , 6As shown in Figures 7 and 8, when the amount of material on conveying device 3 increases, the speed regulator controls the three-phase motor to increase its speed. With the increased speed, the heat loss of the three-phase motor's bearings also increases. Therefore, it is necessary to increase the air intake inside the connecting seat 20 to improve the heat dissipation efficiency of the motor shaft and bearings. Simultaneously, when the amount of material on conveying device 3 is small, to prevent the temperature rise of the motor shaft and bearings from being too rapid, the air intake inside the connecting seat does not need to be too large. Furthermore, since the air compressor needs to supply air to multiple devices, in order to avoid affecting the air supply to other devices when the three-phase motor is at low speed, therefore, in this embodiment... A hollow sealing seat 19 is welded onto the connecting seat 20. A protrusion 22 is provided on the outer wall of the sealing seat 19, and a connecting groove 25 extending through the protrusion 22 and into the interior of the sealing seat 19 is formed. The connecting groove 25 has a rectangular longitudinal section, and the air inlet 17 communicates with the connecting groove 25. A piston 24, capable of sliding freely up and down, is engaged inside the sealing seat 19. The axial length of the piston 24 matches the longitudinal length of the connecting groove 25. Multiple through-hole grooves 27 are formed on the end face of the piston 24. A through hole penetrating the sealing seat 19 is formed on the outer wall of the connecting seat 20. A drive rod is coaxially fixed to the piston 24. 18. The drive rod 18 extends through the bottom of the sealing seat 19 and can slide freely. When there is no material at the inlet end of the conveying device 3, the lower end of the drive rod 18 contacts the base 5. A telescopic spring 26 is installed inside the sealing seat 19. The telescopic spring 26 elastically abuts against the piston 24 and drives the piston 24 to move downward. When material is placed on the conveying device 3, the inlet end of the conveying device 3 will swing downward. Since the lower end of the drive rod abuts against the base, the piston will move upward inside the sealing seat, thereby allowing the opening of the connecting groove 25 to be adjusted autonomously with the upward stroke of the piston. In this way, after the air inlet enters the connecting groove, it will be connected by the connecting... The open portion of the through slot enters the sealing seat, then enters the perforation through the through slot 27, and then enters the connecting seat, before being discharged from the air outlet. This allows compressed air to blow and cool the motor shaft. In addition, as the amount of material on the conveying equipment increases, the upward stroke of the piston also increases, which in turn increases the opening of the connecting slot. This allows the air intake in the connecting seat to be proportional to the amount of material. Furthermore, due to the elastic downward resisting force generated by the telescopic spring on the piston, the lower end of the drive rod always remains in contact with the base, thus ensuring that the piston can slide and return smoothly.

[0046] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0047] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0048] In conclusion, the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency energy-saving controller for a wound-rotor three-phase motor, comprising a base (5), one end of which is rotatably connected to a mounting frame (4), a conveying device (3) is mounted on the mounting frame (4), the discharge end of the conveying device (3) corresponds to the rotation fulcrum of the mounting frame (4) on the base (5), the conveying device (3) is driven to rotate by a three-phase motor (2), a speed regulator (1) is mounted on the base (5), and the speed regulator (1) is provided with a control knob (13) for adjusting the speed of the three-phase motor (2), characterized in that, Also includes: The support column (8) is vertically fixed to the base (5) and corresponds to the feed end of the conveying device (3); The floating sleeve (16) is movably fitted onto the support column (8) and can slide freely up and down; A floating support mechanism is used to connect the floating sleeve (16) and the mounting frame (4), and to support the side of the mounting frame (4) adjacent to the feed end of the conveying device (3). When there is material on the feed end of the conveying device (3), the conveying device (3) can overcome the resistance of the floating support mechanism and move downward, and drive the floating sleeve (16) to move downward. A rotating mechanism is used to synchronously drive the control knob (13) to rotate when the floating sleeve (16) moves up and down, so as to adjust the speed of the three-phase motor (2); The mounting bracket (4) is provided with a connecting seat (20), the three-phase motor (2) is mounted on the connecting seat (20), and the motor shaft of the three-phase motor (2) penetrates the connecting seat (20) and is connected to the conveying device (3). A connecting cavity (23) is opened inside the connecting seat (20), and an air inlet (17) and an air outlet (21) are provided on the outer wall of the connecting seat (20). A hollow sealing seat (19) is fixedly connected to the connecting seat (20). A protrusion (22) is provided on the outer wall of the sealing seat (19). A connecting groove (25) is opened in the protrusion (22) and extends into the interior of the sealing seat (19). The longitudinal section of the connecting groove (25) is rectangular. The air inlet (17) is connected to the connecting groove (25). A piston (24) that can slide freely up and down is engaged in the sealing seat (19). The axial length of the piston (24) matches the longitudinal length of the connecting groove (25). Multiple through-hole grooves (27) are opened on the end face of the piston (24). A through hole is opened on the outer wall of the connecting seat (20) and extends through the sealing seat (19). A drive rod (18) is coaxially fixed to the piston (24). The drive rod (18) extends out of the bottom of the sealing seat (19) and can slide freely. The lower end of the drive rod (18) is in contact with the base (5). A telescopic spring (26) is installed inside the sealing seat (19). The telescopic spring (26) elastically abuts against the piston (24) and drives the piston (24) to move downward.

2. The high-efficiency energy-saving controller for a wound-rotor three-phase motor according to claim 1, characterized in that, The floating support mechanism includes: The reset spring (15) is fitted onto the support column (8), and its two ends in the direction of elastic force elastically abut against the floating sleeve (16) and the base (5), respectively. The hinge rod (6) is hinged at both ends to the floating sleeve (16) and the mounting bracket (4).

3. The high-efficiency energy-saving controller for a wound-rotor three-phase motor according to claim 2, characterized in that, The upper end of the support column (8) is fitted with a limiting nut (7).

4. The high-efficiency energy-saving controller for a wound-rotor three-phase motor according to claim 1, characterized in that, The rotating mechanism includes: The fixed arm (14) is fixedly connected to the base (5); Rotating rod (10) is rotatably connected to the upper end of the fixed arm (14); A floating arm (9) is fixed to the outer wall of the floating sleeve (16), and a sliding pin is provided on the floating arm (9). A waist-shaped hole (28) is opened at one end of the rotating rod (10) near the floating sleeve (16). The sliding pin is inserted into the waist-shaped hole (28) and can slide in the waist-shaped hole (28). An arc-shaped rack (11) is fixed to the other end of the rotating rod (10), and the center of the arc of the arc-shaped rack (11) is coaxial with the rotation fulcrum of the rotating rod (10) on the fixed arm (14). Gear (12) is fixedly mounted on the control knob (13), and gear (12) meshes with arc-shaped rack (11).

5. A high-efficiency energy-saving controller for a wound-rotor three-phase motor according to claim 4, characterized in that, The lateral distance between the pivot point of the rotating rod (10) on the fixed arm (14) and the sliding pin and the control knob (13) is defined as L1 and L2, respectively, with L2 being greater than L1.

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