A wiring board for a permanent magnet motor

Abstract

The present invention discloses a wiring board for a permanent magnet motor, which relates to the technical field of motors and includes: a wiring board body, on which there are wire passing holes and three mounting seats; wiring posts, each mounting seat is detachably mounted with a wiring post through a nut; an observation board, which is detachably mounted at the wire passing holes, and the observation board has three through holes; an electromagnetic shielding ring, the electromagnetic shielding ring is in a circular ring shape, and an electromagnetic shielding ring is mounted at each through hole, and the outer wall of the electromagnetic shielding ring is clamped on the inner wall of the through hole; a cable locking washer, which is formed by stacking and sleeving a plurality of annular washers with different diameters, and the inner annular washer can be peeled off from the outer annular washer, and the outer annular washer can be clamped on the inner wall of the electromagnetic shielding ring. The present invention solves the phenomenon that circulating current is generated in the closed loop of the three-phase stator winding, causing unnecessary stator copper loss, increasing the temperature rise of the motor, reducing the efficiency, and causing the magnetic potential distortion to deteriorate the operating performance of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically to a wiring board for a permanent magnet motor. Background Art

[0002] The motor is the heart device that provides power for various equipment. Due to various advantages such as high power factor, high efficiency, and small current, the permanent magnet synchronous motor is widely used in all walks of life, achieving good energy-saving effects. Usually, the motor wiring is in Y-connection or delta-connection. However, the delta-connection will generate a circulating current phenomenon in the closed loop of the three-phase stator winding, causing unnecessary stator copper loss, increasing the temperature rise of the motor, reducing the efficiency, and sometimes the circulating current will also generate a magnetic potential that distorts the fundamental wave magnetic potential in the air gap, causing harmful additional torque and loss in the motor, and deteriorating the operating performance of the motor.

[0003] Therefore, the permanent magnet synchronous motor usually adopts Y-connection. However, compared with the delta-connection, for a permanent magnet synchronous motor with the same power, the cross-sectional area of the cable lead-out wire will increase by 1.732 times (due to the difference in phase current and line current between Y-connection and delta-connection), which makes the cable lead-out wire thicker. When replacing a three-phase asynchronous motor with a permanent magnet synchronous motor in the industrial field, an ordinary wiring board body cannot meet the wiring requirements of the cable lead-out wire. Especially for a large-power permanent magnet synchronous motor with multiple lead-out wires connected in parallel or the six winding lead ends of U1, V1, W1, U2, V2, and W2 are led out, when making a Y-connection on the wiring board body, there will be a situation where multiple leads are connected to one terminal post, resulting in the inability to install the power line at the customer site. There will also be a phenomenon that the space in the wiring board body is limited and multiple cables cannot be led out. Forcibly installing the lead-out wire copper nose on the terminal post of the wiring board body will cause poor contact, looseness, and breakage of the lead-out wire during long-term operation, resulting in faults such as motor phase loss and burnout. Summary of the Invention

[0004] In view of this, the present invention provides a wiring board for a permanent magnet motor, aiming to solve the problems in the above background art. It is used for the Y-connection of the stator winding of the permanent magnet motor, solving the problems of unnecessary stator copper loss caused by the circulating current generated in the closed loop of the three-phase stator winding, increasing the temperature rise of the motor, reducing the efficiency, and magnetic potential distortion deteriorating the operating performance of the motor.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A wiring board for a permanent magnet motor, comprising:

[0007] A wiring board body, which has wire passing holes and three mounting seats on the wiring board body;

[0008] Terminal posts, each of the mounting seats is detachably mounted with one of the terminal posts through a nut;

[0009] An observation plate, the observation plate is detachably installed at the wire passing hole, and the observation plate is provided with three through holes;

[0010] An electromagnetic shielding ring, the electromagnetic shielding ring is in a circular ring shape, and one electromagnetic shielding ring is installed at each through hole, and the outer wall of the electromagnetic shielding ring is clamped on the inner wall of the through hole;

[0011] A cable locking washer, the cable locking washer is formed by stacking and sleeving a plurality of annular washers with different diameters, and the inner annular washer can be peeled off from the outer annular washer, and the outermost annular washer can be clamped on the inner wall of the electromagnetic shielding ring.

[0012] According to the permanent magnet motor wiring board provided by the present invention, the mounting seat is provided with an axial hole, both ends of the wiring column have threads, and the wiring column is inserted into the axial hole, and nuts are installed on the wiring columns on both sides of the wiring board body to fix the wiring column on the mounting seat.

[0013] According to the permanent magnet motor wiring board provided by the present invention, a stop boss is provided on the side wall of the axial hole, and a flange cooperating with the stop boss is provided on the wiring column.

[0014] According to the permanent magnet motor wiring board provided by the present invention, the wire passing hole has a step, and the observation plate is embedded on the step.

[0015] According to the permanent magnet motor wiring board provided by the present invention, threaded holes for installing the observation plate are provided on the step.

[0016] According to the permanent magnet motor wiring board provided by the present invention, the three mounting seats are arranged side by side, and the observation plate is arranged on one side of the three mounting seats.

[0017] Through the above technical solutions, compared with the prior art, the present invention discloses a permanent magnet motor wiring board, which has the following beneficial effects:

[0018] 1. The permanent magnet motor wiring board of the present invention is used for the Y-connection of the stator windings of a permanent magnet motor, which solves the problem of circulating current generated in the closed loop of the three-phase stator windings, causing unnecessary stator copper loss, increasing the temperature rise of the motor, reducing the efficiency, and causing the running performance of the motor to deteriorate due to magnetic potential distortion;

[0019] 2. The wiring board of the permanent magnet motor of the present invention solves the problems that when the permanent magnet motor is connected in Y-connection, the cable lead-out wire is thick, the cable outlet hole of the ordinary wiring board body is small, which cannot meet the wiring requirements of the cable lead-out wire, and when multiple lead-out wires are connected in parallel, multiple leads are connected to the terminal post, making installation difficult. In addition, forcibly inserting the cable into the terminal post on the wiring board body may cause poor contact, looseness during long-term operation, and burnout of the copper nose of the lead-out wire, ultimately resulting in faults such as motor phase loss and burnout.

[0020] 3. Through the setting of the observation board, it solves the problem that after the traditional wiring board body installs the three-phase lead-out wires of the motor stator, it is not conducive to observing whether the cables in the inner cavity of the machine base are twisted, broken, or loose.

[0021] 4. Through the setting of the electromagnetic shielding ring, it solves the problem of high-frequency interference of external signals and equipment on the three-phase lead-out power lines.

[0022] 5. Through the setting of the cable locking washer, it plays a role in firmly wrapping the cable, effectively preventing foreign objects from falling into the motor coil and causing motor damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 FIG. is a schematic structural diagram of the permanent magnet motor wiring board provided by the present invention;

[0025] Figure 2 FIG. is a schematic structural diagram of the permanent magnet motor wiring board provided by the present invention from another perspective;

[0026] Figure 3 FIG. is a schematic structural diagram of the wiring board body provided by the present invention;

[0027] Figure 4 FIG. is a schematic structural diagram of the terminal post provided by the present invention;

[0028] Figure 5 FIG. is a schematic structural diagram of the observation board provided by the present invention;

[0029] Figure 6 FIG. is a schematic structural diagram of the electromagnetic shielding ring provided by the present invention;

[0030] Figure 7 FIG. is a schematic structural diagram of the cable locking washer provided by the present invention.

[0031] Wherein: 1 is the terminal block body; 2 is the terminal; 3 is the observation plate; 4 is the electromagnetic shielding ring; 5 is the cable locking washer; 6 is the wire passing hole; 7 is the mounting seat; 8 is the through hole; 9 is the axial hole; 10 is the flange. Detailed implementation mode

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] See Figure 1-7 , the embodiments of the present invention disclose a permanent magnet motor terminal block, including: a terminal block body 1, a terminal 2, an observation plate 3, an electromagnetic shielding ring 4 and a cable locking washer 5.

[0034] Among them, the terminal block body 1 is provided with a wire passing hole 6 and three mounting seats 7; the terminal block body 1 is made of epoxy board by casting according to a mold.

[0035] Each mounting seat 7 is detachably mounted with a terminal 2 through a nut; the terminal 2 is used to connect the three-phase lead-out wire heads of the motor stator. The preferred material of the terminal 2 is brass, which has good electrical conductivity and high hardness, and can be fixed in the mounting seat 7 cast and fixed with the terminal block body 1 at the same time as the terminal block body 1.

[0036] The observation plate 3 is detachably mounted at the wire passing hole 6, and the observation plate 3 is provided with three through holes 8; the observation plate 3 is preferably made of transparent organic glass plate, so that the state of the cable in the base chamber can be clearly seen through the observation plate 3, solving the problem that after the traditional terminal block body 1 installs the three-phase lead-out wires of the motor stator, it is not conducive to observing whether the cables in the machine base cavity are twisted, broken or loose.

[0037] The electromagnetic shielding ring 4 is in a circular ring shape, and an electromagnetic shielding ring 4 is installed at each through hole 8. The outer wall of the electromagnetic shielding ring 4 is clamped on the inner wall of the through hole 8; the material of the electromagnetic shielding ring 4 is preferably ferrite permanent magnet material. When the power supply wire of the permanent magnet motor can pass through the electromagnetic shielding ring 4, the electromagnetic shielding ring 4 has a high impedance characteristic for high-frequency harmonic interference signals, which is equivalent to a low-pass filter and can filter out the high-frequency interference of external signals and equipment to the three-phase lead-out power supply wires.

[0038] The cable locking washer 5 is formed by stacking multiple annular washer layers with different diameters, and the inner annular washer can be peeled off from the outer annular washer, and the outermost annular washer can be clamped on the inner wall of the electromagnetic shielding ring 4. The cable locking washer 5 is preferably formed by multi-turn pressing of fluororubber material. The inner annular washers can be easily peeled off to form annular washers with various inner diameter sizes. When in use, small-sized annular washers are peeled off according to the size of the cable outer skin, and the appropriate inner ring of the annular washer is left to tightly wrap the outer skin of the cable, preventing foreign objects from falling into the motor coil and causing motor damage. The cable locking washer 5 is clamped on the inner wall of the electromagnetic shielding ring 4.

[0039] According to the permanent magnet motor terminal board provided by the present invention, the mounting seat 7 is provided with an axial hole 9. Both ends of the terminal post 2 have threads, and the terminal post 2 is inserted into the axial hole 9. By installing nuts on the terminal posts 2 located on both sides of the terminal board body 1, the terminal post 2 is fixed on the mounting seat 7. By setting the terminal post 2 to have a threaded structure at both ends, it can be used for connecting cables at both ends. For example, if two wires are led out, they are connected to the terminal post 2. If two parallel windings with a total of six lead-out wires are used, they are respectively connected at both ends of the terminal post 2. The three lead-out wires connected to the terminal post 2 pass through the observation board 3 and are then connected to the three terminal posts 2 of the terminal board body 1 and fixed by nuts.

[0040] According to the permanent magnet motor terminal board provided by the present invention, a stop boss is provided on the side wall of the axial hole 9, and a flange 10 cooperating with the stop boss is provided on the terminal post 2. By providing a stop boss on the side wall of the axial hole 9, an axial stop function can be achieved for the terminal post 2, which is convenient for installing the terminal post 2 on the mounting seat 7.

[0041] According to the permanent magnet motor terminal board provided by the present invention, the wire passing hole 6 has a step, and the observation board 3 is embedded on the step. The wire passing hole 6 is set in a stepped shape, which is convenient for installing the observation board 3, so that the observation board 3 is installed on the step. Preferably, the height of the step is equal to the thickness of the observation board 3. With such a setting, the observation board 3 and the terminal board body 1 are in the same plane.

[0042] According to the permanent magnet motor terminal board provided by the present invention, threaded holes for installing the observation board 3 are provided on the step. To achieve installing the observation board 3 on the step by screws.

[0043] According to the permanent magnet motor terminal board provided by the present invention, three mounting seats 7 are arranged side by side, and the observation board 3 is arranged on one side of the three mounting seats 7.

[0044] The following further explains the permanent magnet motor terminal board through specific usage steps.

[0045] Step 1: According to the number of motor cable wires, such as for a three-phase permanent magnet motor, with two cable wires in parallel for each phase, there are a total of six cable outlet joints U1, U2, V1, V2, W1, W2. Then install U2, V2, W2 respectively at the threads of the three terminal posts 2 at the lower part of the wiring board body 1, and fasten them with nuts.

[0046] Step 2: Arrange the three cable wires connected at the lower part of the wiring board body 1, and then fix the wiring board body 1 in the motor junction box with screws. At this time, the lower cables enter the motor base chamber.

[0047] Step 3: Install the electromagnetic shielding ring 4 at the through hole 8 of the observation board 3, and the outer wall of the electromagnetic shielding ring 4 fits tightly with the inner wall of the through hole 8 on the observation window.

[0048] Step 4: According to the outer diameters of the remaining U1, V1, W1 three cable wires, peel off the small-sized ring-shaped washer inside the cable locking washer 5, so that the inner hole size of the cable locking washer 5 is equivalent to the outer diameter of the cable.

[0049] Step 5: Install the cable locking washer 5 at the inner hole of the electromagnetic shielding ring 4, and the outer wall of the cable locking washer 5 fits tightly with the inner wall of the electromagnetic shielding ring 4.

[0050] Step 6: Pass the remaining U1, V1, W1 three cable outlet joints through the wire passing hole 6 of the wiring board body 1 and the inner hole of the cable locking washer 5, and be tightly wrapped and fixed by the cable locking washer 5.

[0051] Step 7: Fix the observation board 3 effectively and firmly on the wiring board body 1 with screws.

[0052] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wiring board for a permanent magnet motor, characterized in that, Comprising: A junction block body, on which there are wire passing holes and three mounting seats; Terminal posts, each of the mounting seats is detachably mounted with one of the terminal posts through a nut; An observation plate, which is detachably mounted at the wire passing hole, and there are three through holes on the observation plate; An electromagnetic shielding ring, the electromagnetic shielding ring is in a circular ring shape, and one electromagnetic shielding ring is mounted at each through hole, and the outer wall of the electromagnetic shielding ring is clamped on the inner wall of the through hole; A cable locking washer, the cable locking washer is formed by stacking and sleeving a plurality of annular washer layers with different diameters, and the inner annular washer can be peeled off from the outer annular washer, and the outermost annular washer can be clamped on the inner wall of the electromagnetic shielding ring; The mounting seat has an axial hole, both ends of the terminal post have threads, the terminal post is inserted into the axial hole, and nuts are mounted on the terminal posts on both sides of the junction block body to fix the terminal post on the mounting seat; The wire passing hole has a step, and the observation plate is embedded on the step.

2. The wiring board of the permanent magnet motor according to claim 1, characterized in that There is a stop boss on the side wall of the axial hole, and there is a flange on the terminal post that cooperates with the stop boss.

3. The wiring board of the permanent magnet motor according to claim 1, characterized in that, There are threaded holes for mounting the observation plate on the step.

4. The wiring board of the permanent magnet motor according to claim 1, wherein The three mounting seats are arranged side by side, and the observation plate is arranged on one side of the three mounting seats.

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