Sparkproof brush motor with chip capacitor

Abstract

The utility model discloses a solution of a brush motor with a chip capacitor. The brush motor aims to solve the problem that the conventional brush motor adopts the scheme of adding a piezoresistor and an electrolytic capacitor to suppress sparks. The brush motor comprises a shell and a rotating shaft, the left side of the rotating shaft is located in the shell and fixedly connected with a commutator segment and a circuit board, three chip capacitors are arranged on the circuit board, and one end of each chip capacitor is electrically connected with the commutator segment through a wire. According to the utility model, the scheme of the chip capacitor is adopted to suppress sparks, because the chip capacitor is small in size, the overall size can be reduced, welding can be automatically completed by using equipment during installation, a circuit board does not need to be penetrated, the labor cost is almost not needed, the welding steps are reduced, materials are saved, and the manufacturing time of the circuit board is shortened; and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of brushed motors, and in particular relates to a spark-proof brushed motor with a chip capacitor. Background Art

[0002] During the use of DC brushed motors, the contact part between the commutator and the brush on the armature is crucial to the performance and service life of the motor. Sparks are easily generated during rotation, resulting in abnormal wear of the brushes and commutator. Moreover, the longer the motor is used, the worse the effect, and the lifespan and electromagnetic compatibility with other equipment are very unsatisfactory.

[0003] At present, brushed motors use the solution of adding varistors or electrolytic capacitors to suppress sparks. Both solutions have their limitations. The capacitance of varistors is relatively small, resulting in a weak ability to eliminate sparks. Electrolytic capacitors are large in size and need to be embedded in rotor slots due to process requirements, which affects the number of coils wound in the slots. At the same time, when welding electrolytic capacitors, the pins need to pass through the circuit board and then be welded at the other end of the circuit board. After welding, the corners must be trimmed. This method has high labor costs and low efficiency. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a brushed motor solution with chip capacitors, which aims to solve the shortcomings of the existing brushed motors that use the solution of adding varistors and electrolytic capacitors to suppress sparks, and has the advantages of fully utilizing the slot fill rate, strong spark elimination ability, and efficient production.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides a spark-proof brushed motor with chip capacitors, the brushed motor comprising a shell and a rotating shaft, the left side of the rotating shaft is located inside the shell and is fixedly connected to a commutator segment and a circuit board, three chip capacitors are arranged on the circuit board, one end of the chip capacitor is electrically connected to the commutator pin through a wire on the circuit board, the other ends of the three chip capacitors are connected through a wire on the circuit board, the outer surface of the rotating shaft is fixedly connected to the rotor winding, the inner wall of the shell is fixedly connected to two stator magnets corresponding to the rotor winding, and a commutation assembly corresponding to the commutator segment is arranged on the left side of the shell.

[0008] Preferably, the housing comprises an outer shell and an end cover, and the end cover is detachably mounted on the left side of the outer shell.

[0009] Furthermore, grooves are provided at both the front and rear ends of the left side of the end cover, and limiting blocks bent into the grooves are provided at both the front and rear ends of the left side of the shell.

[0010] Furthermore, a heat dissipation hole is opened on the upper side of the shell, and the heat dissipation hole is located between the two stator magnets.

[0011] Furthermore, the left end of the rotating shaft is rotatably connected to the end cover through a first bearing, and the right end of the rotating shaft is rotatably connected to the housing through a second bearing.

[0012] Furthermore, the rotor winding includes an iron core formed by stacking multiple layers of silicon steel sheets, a coil is wound around the outer surface of the iron core, and the coil is electrically connected to the commutator segment.

[0013] Furthermore, the commutation assembly includes two lead plates installed on the end cover, one end of the lead plate located inside the shell is fixedly connected to an elastic conductive plate, and one end of the conductive plate is installed with a carbon brush in contact with the commutation plate.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] Through precise calculation and experimental verification, the utility model uses the method of connecting the chip capacitor to effectively suppress the spark generated during commutation, and uses the chip capacitor to absorb the spark energy during the commutation process, thereby reducing the impact of the strong pulse voltage generated by the spark on the circuit, commutator and brush. The motor runs smoothly, the service life is increased by more than 2 times, and the electromagnetic interference is reduced by 7-10DB, which improves the life of the motor and compatibility with other equipment.

[0017] The utility model suppresses sparks by adopting the solution of chip capacitors. Since the chip capacitors are small in size, the overall volume can be reduced. When installing, they only need to be attached to the circuit board, and then the equipment can automatically complete the welding without passing through the circuit board. The whole installation process is more portable, almost no labor cost is required, the welding steps are reduced, materials are saved, and the production time of the circuit board is shortened, which greatly improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0020] Figure 3 It is a structural schematic diagram of the end cover of the utility model.

[0021] Figure 4 It is a structural schematic diagram of the rotor winding of the utility model.

[0022] Figure 5 It is a schematic diagram of the installation structure of the circuit board of the utility model.

[0023] Figure 6 It is a circuit structure schematic diagram of the circuit board of the utility model.

[0024] The markings in the accompanying drawings are: 1, shell; 2, rotating shaft; 3, commutator; 4, circuit board; 5, chip capacitor; 6, rotor winding; 7, stator magnet; 8, commutation assembly; 101, shell; 102, end cover; 103, groove; 104, limit block; 105, heat dissipation hole; 201, first bearing; 202, second bearing; 601, iron core; 602, coil; 801, lead plate; 802, conductive plate; 803, carbon brush. DETAILED DESCRIPTION

[0025] This specific implementation is a spark-proof brushless motor with a chip capacitor, and its structural diagram is shown in FIG. Figure 1-Figure 6 As shown, the brushed motor includes a housing 1 and a rotating shaft 2. The left side of the rotating shaft 2 is located inside the housing 1 and is fixedly connected to a commutator segment 3 and a circuit board 4. Three chip capacitors 5 are arranged on the circuit board 4. One end of the chip capacitor 5 is electrically connected to the commutator pole piece 3 through a wire on the circuit board, and the other ends of the three chip capacitors 5 are connected through a wire on the circuit board. In the initial stage of commutation, the chip capacitor 5 is used to absorb the running spark, thereby reducing the impact of the strong pulse voltage on the connection, so that the motor runs smoothly. The chip capacitor 5 can be selected to be 3-4.7UF, the outer surface of the rotating shaft 2 is fixedly connected to the rotor winding 6, the inner wall of the housing 1 is fixedly connected to two stator magnets 7 corresponding to the rotor winding 6, and a commutation assembly 8 corresponding to the commutator segment 3 is arranged on the left side of the housing 1.

[0026] like Figure 1 and Figure 2 As shown: In this embodiment, the shell 1 includes an outer shell 101 and an end cover 102. The end cover 102 can be detachably installed on the left side of the outer shell 101. Grooves 103 are provided at the front and rear ends of the left side of the end cover 102. Limit blocks 104 bent into the groove 103 are provided at the front and rear ends of the left side of the outer shell 101.

[0027] In this way, the limiting block 104 is bent into the groove 103 to fix the end cover 102, which is convenient for assembling the brush motor, does not need to be fixed with screws, and saves manufacturing costs.

[0028] like Figure 1 and Figure 2 As shown: In this embodiment, a heat dissipation hole 105 is opened on the upper side of the housing 101, and the heat dissipation hole 105 is located between the two stator magnets 7.

[0029] In this way, the high temperature inside the brush motor can be discharged through the heat dissipation holes 105, thereby avoiding high temperature inside the brush motor and increasing its service life.

[0030] like Figure 2 , Figure 3 and Figure 4 As shown: In this embodiment, the left end of the rotating shaft 2 is rotatably connected to the end cover 102 through the first bearing 201, and the right end of the rotating shaft 2 is rotatably connected to the housing 101 through the second bearing 202.

[0031] The rotating shaft 2 is arranged in this way so as to be able to rotate smoothly between the end cover 102 and the housing 101, thereby better driving the external components to rotate.

[0032] like Figure 2 and Figure 4 As shown: In this embodiment, the rotor winding 6 includes an iron core 601 formed by stacking multiple layers of silicon steel sheets, and a coil 602 is wound around the outer surface of the iron core 601 , and the coil 602 is electrically connected to the commutator segment 3 .

[0033] When the coil 602 is energized, the iron core 601 can generate a magnetic field, which cooperates with the stator magnet 7 to drive the rotating shaft 2 to rotate.

[0034] like Figure 2 and Figure 3 As shown: In this embodiment, the commutation assembly 8 includes two lead-in plates 801 installed on the end cover 102, one end of the lead-in plate 801 located inside the housing 101 is fixedly connected to an elastic conductive plate 802, and one end of the conductive plate 802 is installed with a carbon brush 803 in contact with the commutation segment 3.

[0035] In this way, after the lead-in piece 801 is energized, the electricity is transferred to the commutator segment 3 through the carbon brush 803, which can stably complete the commutation. That is, the lead-in piece 801 contacts the commutator segment 3 through the conductive piece 802 and the carbon brush 803 to perform commutation, and the chip capacitor 5 is used to eliminate sparks, thereby reducing the impact of strong pulse voltage on the connection.

[0036] Working principle: Through precise calculation and experimental verification, the utility model uses a bypass chip capacitor to effectively suppress the sparks generated during commutation. During the commutation process, the chip capacitor is used to absorb the spark energy, thereby reducing the impact of the strong pulse voltage generated by the spark on the circuit, commutator, and brush. The motor can run smoothly, the service life is increased by more than 2 times, and the electromagnetic interference can be reduced by 7-10DB, so that the life of the motor and compatibility with other equipment are better. Sparks are suppressed by adopting the solution of chip capacitor 5. Since the chip capacitor is small in size, the overall volume can be reduced. When installing, it only needs to be attached to the circuit board, and then the equipment can automatically complete the welding without passing through the circuit board 4. The entire installation process is more portable, almost no labor cost is required, the welding steps are reduced, materials are saved, and the production time of the circuit board 4 is shortened, which greatly improves production efficiency.

[0037] All technical features in this embodiment can be freely combined according to actual needs.

[0038] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A spark-proof brushed motor with a chip capacitor, the brushed motor comprising a housing (1) and a rotating shaft (2), characterized in that: The left side of the rotating shaft (2) is located inside the housing (1) and is fixedly connected to a commutator segment (3) and a circuit board (4); three chip capacitors (5) are arranged on the circuit board (4); one end of the chip capacitor (5) is electrically connected to the commutator segment (3) through a wire on the circuit board, welding or spot welding; the other ends of the three chip capacitors (5) are connected through a wire on the circuit board; the outer surface of the rotating shaft (2) is fixedly connected to a rotor winding (6); the inner wall of the housing (1) is fixedly connected to two stator magnets (7) corresponding to the rotor winding (6); and a commutation assembly (8) corresponding to the commutator segment (3) is arranged on the left side of the housing (1).

2. The spark-proof brushed motor with chip capacitor according to claim 1, characterized in that: The housing (1) comprises an outer shell (101) and an end cover (102), wherein the end cover (102) is detachably mounted on the left side of the outer shell (101).

3. The spark-proof brushed motor with chip capacitor according to claim 2, characterized in that: The front and rear ends of the left side of the end cover (102) are both provided with grooves (103), and the front and rear ends of the left side of the shell (101) are both provided with limit blocks (104) bent into the grooves (103).

4. The spark-proof brushed motor with chip capacitor according to claim 3, characterized in that: A heat dissipation hole (105) is provided on the upper side of the housing (101), and the heat dissipation hole (105) is located between the two stator magnets (7).

5. The spark-proof brushed motor with chip capacitor according to claim 4, characterized in that: The left end of the rotating shaft (2) is rotatably connected to the end cover (102) via a first bearing (201), and the right end of the rotating shaft (2) is rotatably connected to the housing (101) via a second bearing (202).

6. The spark-proof brushed motor with chip capacitor according to claim 5, characterized in that: The rotor winding (6) comprises an iron core (601) formed by stacking multiple layers of silicon steel sheets, a coil (602) is wound around the outer surface of the iron core (601), and the coil (602) is electrically connected to the commutator segment (3).

7. The spark-proof brushed motor with chip capacitor according to claim 6, characterized in that: The commutation assembly (8) comprises two lead plates (801) mounted on the end cover (102); one end of the lead plate (801) located inside the housing (101) is fixedly connected to an elastic conductive plate (802); one end of the conductive plate (802) is mounted with a carbon brush or an electric brush (803) in contact with the commutation segment (3).

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