CN210137256U

CN210137256U - Direct current motor, pump with same and vehicle

Info

Publication number: CN210137256U
Application number: CN201921211934.4U
Authority: CN
Inventors: 许清香
Original assignee: Xiamen Koge Micro Tech Co Ltd
Current assignee: Xiamen Koge Micro Tech Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-03-10
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses a direct current motor, direct current motor includes: a stator having a receiving cavity with one end opened; the rotor is rotatably arranged in the accommodating cavity and provided with a first capacitor; the end cover covers the accommodating cavity, a second capacitor is arranged on the end cover, and the first capacitor and the second capacitor are arranged in the accommodating cavity. According to the utility model discloses direct current motor, first electric capacity locate on the rotor, the second electric capacity locate on the end cover, and first electric capacity and second electric capacity all locate and hold the intracavity, can effectively improve direct current motor's filter effect and reduce direct current motor's volume.

Description

Direct current motor, pump with same and vehicle

Technical Field

The utility model relates to a motor technical field, concretely relates to direct current motor and pump that has it and the vehicle that has this pump.

Background

With the continuous improvement of living standard of people and the continuous increase of the quantity and the variety of household appliances, people pay more and more attention to the problem of electromagnetic compatibility of electronic equipment, especially electromagnetic radiation of a direct current motor in the household appliances directly influences the living quality of people, such as the normal work of household radios, televisions and other electronic equipment. Therefore, electronic equipment manufacturers continuously improve the EMC performance of electronic equipment, and meanwhile, the requirements on the cost, the size and the manufacturability of the EMC filter circuit are higher and higher. In the related art, the direct current motor filter circuit generally has the defects of weak filtering capability, large occupied space size and the like.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent.

Therefore, an object of an embodiment of the first aspect of the present invention is to provide a dc motor, which has a better filtering effect.

It is an object of embodiments of the second aspect of the present invention to provide a pump having a dc motor as described above.

It is an object of an embodiment of the third aspect of the present invention to provide a vehicle having the above-mentioned pump.

According to the utility model discloses direct current motor, include: a stator having a receiving cavity with one end opened; the rotor is rotatably arranged in the accommodating cavity and provided with a first capacitor; the end cover covers the accommodating cavity, a second capacitor is arranged on the end cover, and the first capacitor and the second capacitor are arranged in the accommodating cavity.

According to the utility model discloses direct current motor, first electric capacity locate on the rotor, the second electric capacity locate on the end cover, and first electric capacity and second electric capacity all locate and hold the intracavity, can effectively improve direct current motor's filter effect and reduce direct current motor's volume.

In addition, the dc motor according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the present invention, the rotor comprises: the rotor core is provided with a plurality of rotor slots which are arranged at intervals along the circumferential direction of the rotor core, and at least one part of the first capacitor is arranged in the rotor slots; and the rotor windings penetrate through the rotor slots and are wound on the rotor iron core.

According to the utility model discloses an embodiment, every the rotor inslot all is equipped with first electric capacity, every the one end of first electric capacity with rotor winding links to each other, and the other end is connected as the common port.

According to the utility model discloses an embodiment, adjacent be close to of first electric capacity still be connected with piezo-resistor between the one end of rotor winding.

According to an embodiment of the present invention, the number of the first capacitors is three, and the capacitance size of the first capacitors is between 0.05 μ F and 8.0 μ F.

According to an embodiment of the present invention, the dc motor has a positive terminal, a negative terminal and a ground terminal, and the second capacitor includes two capacitors connected in sequence, wherein one end of one of the second capacitors is connected to the positive terminal, and the other end is connected to the ground terminal; and one end of the other second capacitor is connected with the negative electrode access end, and the other end of the other second capacitor is connected with the grounding end.

According to an embodiment of the invention, the capacitance size of the second capacitor is between 0.01 μ F and 2 μ F.

According to the utility model discloses an embodiment, still be equipped with the inductance on the end cover.

According to the utility model discloses the pump of second aspect embodiment, including foretell direct current motor, the stability of pump is high, and anti-electromagnetic interference ability is strong.

According to the utility model discloses vehicle of third aspect embodiment, including foretell pump, the stability of vehicle is high, and anti-electromagnetic interference ability is strong.

Drawings

Fig. 1 is a front view of a dc motor according to an embodiment of the present invention;

fig. 2 is a schematic wiring diagram of a rotor winding of a dc motor according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a dc motor according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a dc motor according to an embodiment of the present invention;

fig. 5 is a schematic diagram of the connection relationship between the rotor and the first capacitor and the piezoresistor according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a connection relationship between an end cap and a second capacitor according to an embodiment of the present invention;

fig. 7 is a half sectional view of a dc motor according to an embodiment of the present invention;

fig. 8 is a schematic diagram of the connection relationship of the rotor with the first capacitor and the varistor according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a connection relationship between an end cap and a second capacitor according to an embodiment of the present invention.

Reference numerals:

a dc motor 100, a positive terminal 101, a negative terminal 102, a ground terminal 103,

the stator (10) is provided with a stator,

rotor 20, rotor core 21, rotor winding 22,

the end caps 30 are attached to the outer surface of the body,

a first capacitor 40, a second capacitor 50, a voltage dependent resistor 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A dc motor 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9, and as shown in fig. 1, 4 and 7, the dc motor 100 may generally include: stator 10, rotor 20 and end cap 30.

Specifically, as shown in fig. 1 and 3 and fig. 4 and 7, the stator 10 has a receiving cavity with an open end, the rotor 20 is rotatably disposed in the receiving cavity, the rotor 20 is provided with a first capacitor 40, as shown in fig. 6 and 9, the end cover 30 covers the receiving cavity, the end cover 30 is provided with a second capacitor 50, wherein the first capacitor 40 and the second capacitor 50 are both disposed in the receiving cavity.

Locate first electric capacity 40 on rotor 20 to locate second electric capacity 50 on end cover 30, and locate first electric capacity 40 and second electric capacity 50 and all locate and hold the intracavity, be favorable to improving DC motor 100's wholeness, reduce DC motor 100's volume.

The first capacitor 40 and the second capacitor 50 are EMC components, and the EMC components are components that can satisfy electromagnetic compatibility functions, operate in compliance with requirements in an electromagnetic environment, and do not generate intolerable electromagnetic interference to any equipment in the environment; EMC includes two requirements: on one hand, the electromagnetic interference generated by the equipment to the environment cannot exceed a certain limit value in the normal operation process, and on the other hand, the electromagnetic interference existing in the environment has a certain degree of immunity, namely electromagnetic sensitivity, to the electromagnetic interference.

Through setting up first electric capacity 40 and second electric capacity 50, can effectively restrain high frequency noise and electromagnetic interference on signal line, the power cord, still have the effect of absorbing electrostatic pulse, under the prerequisite that does not influence motor mounting structure, reduced the motor to circuit and peripheral electromagnetic radiation and interference, low price easy-to-use has apparent effect to the filtering high frequency noise, has improved the motor performance.

In addition, the second capacitor 50 is disposed on the end cap 30, so that the filter circuit can be maximally close to the interference source, and the filtering effect is significantly improved.

From this, according to the utility model discloses direct current motor 100, through locating first electric capacity 40 on rotor 20, second electric capacity 50 is located on end cover 30 to locate first electric capacity 40 and second electric capacity 50 and hold the intracavity, be favorable to improving direct current motor 100's filtering effect, make its job stabilization, and improved direct current motor 100's wholeness, be favorable to reducing direct current motor 100's size.

In some embodiments, as shown in fig. 5 and 8, the rotor 20 includes a rotor core 21 and a plurality of rotor windings 22, the rotor core 21 has a plurality of rotor slots 201 arranged at intervals along a circumferential direction of the rotor core 21, at least a portion of the first capacitor 40 is disposed in the rotor slots 201, and the rotor windings 22 pass through the rotor slots 201 and are wound on the rotor core. The first capacitor 40 can be integrally embedded into the rotor slot 201, or a part of the first capacitor 40 can be embedded into the rotor slot 201, so that the integrity of the first capacitor 40 and the rotor 20 is improved, and the size of the dc motor 100 is reduced. Wherein the first capacitor 40 is electrically connected to the rotor winding 22.

In some alternative embodiments, as shown in fig. 2, a first capacitor 40 is disposed in each rotor slot 201, and one end of each first capacitor 40 is connected to the rotor winding 22, and the other end is connected as a common terminal. The electrical noise of a dc motor is a spike voltage, mainly generated by the motor brushes. The opening of the brushes from the commutator segment contacts produces voltage spikes which are bypassed by the first capacitor 40 by providing a very low impedance path to the common side of the noise source. The first capacitor 40 may be connected between each lead of the motor and ground, or between two leads. Coupling the first capacitor 40 between the brush and ground reduces the probability of voltage spikes. By providing a plurality of first capacitors 40, the filtering effect of the dc motor 100 can be further improved.

In some embodiments, as shown in fig. 2, 4 and 5, a voltage dependent resistor 60 is further connected between the ends of the adjacent first capacitors 40 close to the rotor winding 22. By providing the varistor 60, the voltage sensing corresponds to an inductance, which acts to prevent sudden changes in the brush current as it passes through the commutator gap. A choke in series in the circuit can be combined with a shunt capacitance to ground to form a low pass filter, which can enhance the filtering effect of the individual inductances or capacitances.

In one embodiment, as shown in FIG. 2, the number of the first capacitors 40 is three, and the capacitance of the first capacitors 40 is between 0.05 μ F and 8.0 μ F. Preferably, the capacitance magnitude of the first capacitance 40 is between 0.1 μ F and 5.0 μ F, and further preferably, the capacitance magnitude of the first capacitance 40 is between 0.1 μ F and 2.2 μ F. In other words, the capacitance on the rotor 20 can be selected to be 0.1 μ F, 1 μ F, 2.2 μ F, 4.7 μ F, etc., depending on the number of rotor slots 201 of the motor, which is preferably 3-10 slots. Limiting the capacitance size of the first capacitor 40 to between 0.05 μ F and 8.0 μ F facilitates the dc motor to meet EMC test requirements in terms of conduction and radiation at high frequencies.

In some embodiments, as shown in fig. 3, the dc motor 100 has a positive terminal 101, a negative terminal 102 and a ground terminal 103, and the second capacitor 50 includes two capacitors connected in sequence, wherein one end of one of the second capacitors 50 is connected to the positive terminal 101, and the other end is connected to the ground terminal 103; one end of the second capacitor 50 is connected to the negative terminal 102, and the other end is connected to the ground terminal 103. The two second capacitors 50 are equivalent to a common-mode capacitor, the common-mode capacitor is introduced into the circuit, when a common-mode interference current flows through the coil, due to the isotropy of the common-mode interference current, a magnetic field in the same direction is generated in the coil to increase the inductance of the coil, so that the coil presents high impedance and generates a strong damping effect, thereby attenuating the common-mode interference current and achieving the purpose of filtering.

In some embodiments, the second capacitor 50 includes one or more capacitors connected in series, and one end of the second capacitor 50 is connected to the positive terminal and the other end is connected to the negative terminal. Thus, the second capacitor 50 is configured as a differential mode capacitor, and if a differential mode interference signal exists in the power supply loop, the differential mode capacitor provides the shortest path to bypass the differential mode interference signal, thereby suppressing the generation of the differential mode interference signal.

In some alternative embodiments, the second capacitor has a capacitance of between 0.01 μ F and 2 μ F. For example, the two second capacitances 50 may be at least one of 0.01 μ F, 0.1 μ F, 0.5 μ F, 1.0 μ F, 1.5 μ F, and 0.2 μ F. It will be appreciated that the choice of the second capacitor 50 as a small capacitance facilitates the dc motor to meet EMC test requirements in terms of conduction and radiation at high frequencies.

In some embodiments, an inductor is also disposed on the end cap 30. The filtering effect can be further improved through the combined action of the inductor and the capacitor.

In some alternative embodiments, the positive input terminal is provided with a first inductor and a second inductor, one end of the second capacitor 50 is connected between the first inductor and the second inductor, the negative input terminal is provided with a third inductor and a fourth inductor, and the other end of the second capacitor 50 is connected between the third inductor and the fourth inductor. The second inductor and the fourth inductor are close to the access end of the motor, the second inductor is a high-frequency inductor, and the first inductor and the third inductor are low-frequency inductors. Thus, high-frequency inductors are connected to both the positive and negative terminals of the dc motor 100, and high-frequency interference of the dc motor 100 can be suppressed. The first inductor and the third inductor are low-frequency inductors, so that low-frequency interference of the dc motor 100 can be suppressed. Therefore, the dc motor 100 of the present application has good suppression capability for interference of both high frequency band and low frequency band, and further improves the filtering effect of the present application.

According to the utility model discloses the pump, including foretell direct current motor, the stability of pump is high, and anti-electromagnetic interference ability is strong.

According to the utility model discloses vehicle, including foretell pump, the stability of vehicle is high, and anti-electromagnetic interference ability is strong.

Other components and structures of the dc motor 100, the pump and the vehicle according to the embodiments of the present invention are easily obtained and understood by those skilled in the art, and will not be described herein.

Of course, the pump in the present application includes, but is not limited to, a vehicle pump, for example, the pump in the present application may also be a liquid pump, an air pump, and the like. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A direct current motor, comprising:

a stator having a receiving cavity with one end opened;

the rotor is rotatably arranged in the accommodating cavity and provided with a first capacitor;

the end cover is used for sealing the accommodating cavity and is provided with a second capacitor,

the first capacitor and the second capacitor are arranged in the accommodating cavity.

2. The direct current motor according to claim 1, wherein the rotor comprises:

the rotor core is provided with a plurality of rotor slots which are arranged at intervals along the circumferential direction of the rotor core, and at least one part of the first capacitor is arranged in the rotor slots;

and the rotor windings penetrate through the rotor slots and are wound on the rotor iron core.

3. The dc motor of claim 2, wherein the first capacitor is provided in each of the rotor slots, and one end of each of the first capacitors is connected to the rotor winding and the other end is connected as a common terminal.

4. The direct current motor according to claim 3, wherein a voltage dependent resistor is further connected between ends of the adjacent first capacitors close to the rotor winding.

5. The DC motor of claim 3, wherein the number of the first capacitors is three, and the capacitance of the first capacitors is between 0.05 μ F and 8.0 μ F.

6. The DC motor of claim 1, wherein the DC motor has a positive terminal, a negative terminal, and a ground terminal, the second capacitor comprises two connected in series,

one end of one of the second capacitors is connected with the positive electrode access end, and the other end of the second capacitor is connected with the grounding end; and one end of the other second capacitor is connected with the negative electrode access end, and the other end of the other second capacitor is connected with the grounding end.

7. The DC motor of claim 6, wherein the second capacitor has a capacitance of between 0.01 μ F and 2 μ F.

8. A DC motor according to any of claims 1-7, characterized in that the end caps are further provided with an inductance.

9. A pump, characterized by comprising a direct current motor according to any one of claims 1-7.

10. A vehicle comprising a pump according to claim 9.