CN114448128A

CN114448128A - Anti-interference motor of multislot car wind window scavenging pump

Info

Publication number: CN114448128A
Application number: CN202210125777.5A
Authority: CN
Inventors: 陈冠军; 王卓翊; 吴震
Original assignee: Changzhou Best Bmw Motor Co ltd
Current assignee: Changzhou Best Bmw Motor Co ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-05-06

Abstract

The invention discloses an anti-interference motor of a multi-groove automobile air window cleaning pump, which comprises: a rotor assembly, the rotor assembly comprising: the rotor comprises a rotor iron core and a commutator matched with the rotor iron core; the number of slots of the rotor core and the number of slots of the commutator are the same even number and are more than or equal to 10. According to the anti-interference motor for the multi-groove automobile air window cleaning pump, the rotor cores and the commutators with even number of grooves are arranged, so that the windings of the motor are distributed on the circumference of an air gap in a balanced manner, the radial magnetic tension generated by the motor tends to be balanced, the vibration and the torque pulsation of the motor are reduced, and the radiation level of the motor is further reduced. By increasing the number of slots of the commutator and the number of slots of the rotor core to 10, the inter-segment voltage between the commutator segments can be reduced, the level of sparks generated during commutation is reduced, and the electromagnetic radiation level of the motor is reduced. The invention has the characteristics of simple structure, low cost, contribution to batch production and strong anti-interference capability.

Description

Anti-interference motor of multislot car wind window scavenging pump

Technical Field

The invention relates to the technical field of automobile air window cleaning pump motors, in particular to an anti-interference motor of a multi-groove automobile air window cleaning pump.

Background

Along with the rapid development of new energy automobiles, more and more sensors and electronic equipment are arranged in the automobiles, and the requirements of the electronic equipment of the whole automobiles on EMC are more and more important, for example, a cleaning pump motor, a headlamp cleaning motor, a wiper motor and the like used in the cleaning process of front windshield of the automobiles need to have certain EMC anti-interference capability, because the motors are generally direct current brushed motors, the rotating speed of the motors is generally higher, the electromagnetic radiation generated by the motors during working cannot interfere with other electronic equipment of the automobiles, and the requirements of mainstream manufacturers of the new energy automobiles on the EMC anti-interference capability reach the national standard GB/T18655 five-level at present.

The cleaning pump motor in the prior art has some EMC anti-jamming circuits, but the circuit is simple, and the interference killing feature can not reach the lowest one-level standard of national standard, or the interference killing feature can pass through the low-level standard but the circuit design is complicated, needs redesign motor structure, makes the degree of difficulty and with high costs, is not convenient for mass production and manufacturing.

In view of the above problems in the prior art, it is urgently needed to design a new anti-interference motor for an automobile windshield cleaning pump to make up for the deficiencies in the prior art.

Disclosure of Invention

The invention aims to provide an anti-interference motor of a multi-groove automobile air window cleaning pump, which increases the number of grooves of a rotor core and a commutator under the condition of not changing the original installation size of the motor, and designs the number of the grooves of the rotor core and the number of the grooves of the commutator into an even number, thereby effectively reducing the radiation level of the motor.

In order to achieve the purpose, the invention provides the following scheme:

the utility model provides an anti-interference motor of multislot car windscreen washer pump, includes: rotor subassembly, stator module and end cover subassembly, its characterized in that, the rotor subassembly includes: the rotor comprises a rotor iron core and a commutator matched with the rotor iron core;

the number of the grooves of the rotor assembly and the number of the grooves of the commutator are the same even number and are more than or equal to 10.

Optionally, the rotor assembly is provided with a first overvoltage protection device, and the first overvoltage protection device is uniformly distributed at one end of the commutator segment of the commutator in an annular shape.

Optionally, the first overvoltage protection device is a resistance element, and the resistance element is a piezoresistor.

Optionally, the anti-interference circuit is arranged on the end cover assembly, and the anti-interference circuit is a filter circuit.

Optionally, the filter circuit is an LC filter circuit.

Optionally, the LC filter circuit is an LC parallel connection circuit.

Optionally, the number of the capacitor and the number of the inductor in the LC parallel circuit are two respectively.

Optionally, the two inductors are connected in series with the commutator, and the two capacitors are respectively connected in parallel with the commutator.

Optionally, the filter circuit is further connected in parallel with a second overvoltage protection device.

Optionally, the second overvoltage protection device is a TVS element.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

according to the anti-interference motor for the multi-groove automobile air window cleaning pump, the rotor cores and the commutators with even number of grooves are arranged, so that the windings of the motor are distributed on the circumference of an air gap in a balanced manner, the radial magnetic tension generated by the motor tends to be balanced, the vibration and the torque pulsation of the motor are reduced, and the radiation level of the motor is further reduced. By increasing the number of slots of the commutator and the number of slots of the rotor core to 10, the inter-segment voltage between the commutator segments can be reduced, the level of sparks generated during commutation is reduced, and the electromagnetic radiation level of the motor is reduced. The anti-interference motor for the multi-groove automobile air window cleaning pump has the characteristics of simple structure, low cost, contribution to batch production and strong anti-interference capability.

Drawings

In order to more clearly illustrate the technical solutions in the present embodiment or the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a rotor assembly of an anti-interference motor of a multi-groove automobile air window cleaning pump according to the present invention;

FIG. 2 is a schematic structural diagram of a PCB circuit board of an anti-interference motor of the multi-groove automobile air window cleaning pump of the invention;

FIG. 3 is a circuit diagram of an anti-jamming circuit of the anti-jamming motor of the multi-slot automobile windshield washer pump of the present invention;

FIG. 4 is a graph of the results of a vertical load electromagnetic radiation test for a 5-slot motor;

FIG. 5 is a graph of the results of a horizontal load electromagnetic radiation test for a 5-slot motor;

FIG. 6 is a graph of the results of a 10 slot motor vertical load electromagnetic radiation test;

FIG. 7 is a graph of the results of a 10-slot motor horizontal load electromagnetic radiation test;

description of reference numerals: 1. a rotor; 2. a commutator; 3. a first overvoltage protection device; 4. a first capacitor; 5. a first inductor; 6. welding the hole; 7. a second overvoltage protection device; 8. a second inductor; 9. a second capacitance.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The embodiment is as follows:

the invention provides an anti-interference motor of a multi-groove automobile air window cleaning pump, as shown in figure 1, the anti-interference motor of the multi-groove automobile air window cleaning pump comprises:

rotor subassembly, stator module and end cover subassembly, the rotor subassembly include rotor core and rather than the commutator of adaptation, and rotor core's slot number and commutator 2's slot number are the same even number, and more than or equal to 10, and the rotor core of 10 slot numbers is specifically adopted to this embodiment, and the commutator of 10 slot numbers is used in the cooperation.

The invention adopts the newly designed rotor core with 10 slots and even slots and the commutator with 10 slots and even slots to ensure that the radiation level of the motor body is greatly reduced compared with that of a conventional 3-slot or 5-slot motor by matching with the commutator with 10 slots and even slots.

The rotor assembly is provided with a first overvoltage protection device 3, and the first overvoltage protection devices 3 are uniformly distributed at one end of a commutator segment of the commutator 2 in a ring shape; the first overvoltage protection device 3 is a resistance element, the resistance element is a varistor element, and a varistor is adopted in the embodiment in the type selection of the first overvoltage protection device 3.

As shown in fig. 2 and fig. 3, a PCB is additionally arranged on the end cover, an anti-interference circuit is designed on the PCB, two welding holes 6 are welded on two sides of the PCB, and the anti-interference circuit on the PCB is connected with the motor body through the welding holes 6. The specific anti-jamming circuit of this embodiment adopts an LC filter circuit, and an inductor and a capacitor in the LC filter circuit are connected in parallel.

As shown in fig. 3, the number of the capacitors and the inductors in the LC parallel circuit is two, the first inductor 5 and the second inductor 8 are connected in series with the commutator, and the first capacitor 4 and the second capacitor 9 are connected in parallel with the commutator. The first capacitor 4 and the second capacitor 9 are differential mode capacitors, and are mainly used for inhibiting differential mode interference electromagnetic waves in sparks (electric arcs) generated between the commutator and the carbon brush in the running process of the motor, and the wave band is mainly concentrated at 150 kHz-30 MHz. The first inductor 5 and the second inductor 8 are both rod-shaped differential mode inductors which are used as energy storage filter elements, and form an LC resonance circuit with the first capacitor 4 and the second capacitor 9 in the circuit, so that the differential mode and common mode interference signals are inhibited.

The filter circuit is also connected with a second overvoltage protection device 7 in parallel, the second overvoltage protection device 7 in the embodiment is a TVS element, and the TVS element is used for suppressing transient voltage at the moment of switching the motor.

This embodiment is through increasing PCB circuit board and 10 even number of slots groove rotor core, 10 even number of slots groove commutators and annular piezo-resistor on motor end cover subassembly, increases the anti-jamming circuit who is fit for batch production under the condition that does not change the original mounting dimension of motor, can solve on the market that conventional motor structure is congenital not enough in the aspect of the anti-interference of EMC, makes the anti-interference grade of EMC can reach more than GB/T18655 standard five grades.

Carrying out radiation test on a 5-slot motor and a 10-slot motor under the same condition, wherein the test frequency is as follows: 1447-:

the results of the radiation testing of the vertical load of the 5 slot machine are shown in table 1 in conjunction with fig. 4:

TABLE 1

The results of the radiation testing of the horizontal load of the 5-slot motor are shown in table 2 with reference to fig. 5:

TABLE 2

The test result shows that the radiation level of the 5-slot motor exceeds the limit value under vertical load and horizontal load, and the test result is that the standard requirement is not met.

The results of the radiation testing of the vertical load of the 10 slot machine are shown in table 3, with reference to fig. 6:

TABLE 3

The results of the radiation testing of the horizontal load of the 10 slot machine are shown in table 4, in conjunction with fig. 7:

TABLE 4

The test result shows that the radiation level of the 10-slot motor is within the limit range under vertical load and horizontal load, and the test result is in accordance with the standard requirement.

According to the anti-interference motor for the multi-groove automobile air window cleaning pump, the rotor cores and the commutators with even number of grooves are arranged, so that the windings of the motor are distributed on the circumference of an air gap in a balanced manner, the radial magnetic tension generated by the motor tends to be balanced, the vibration and the torque pulsation of the motor are reduced, and the radiation level of the motor is further reduced. By increasing the number of slots of the commutator and the number of slots of the rotor core to 10, the inter-segment voltage between the commutator segments can be reduced, the level of sparks generated during commutation is reduced, and the electromagnetic radiation level of the motor is reduced. By arranging the overvoltage protection device on the rotor assembly and arranging the anti-interference circuit on the end cover, the EMC anti-interference grade of the motor can reach more than five grades of national standard GB/T18655 under the condition that the original installation size of the motor is not changed. The anti-interference motor for the multi-groove automobile air window cleaning pump has the characteristics of simple structure, low cost, contribution to batch production and strong anti-interference capability.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides an anti-interference motor of multislot car windscreen washer pump, includes: rotor subassembly, stator module and end cover subassembly, its characterized in that, the rotor subassembly includes: the rotor comprises a rotor iron core and a commutator matched with the rotor iron core;

the number of the slots of the rotor core and the number of the slots of the commutator are the same even number and are more than or equal to 10.

2. The anti-interference motor for the multi-groove automobile air window cleaning pump according to claim 1, wherein a first overvoltage protection device is arranged on the rotor assembly, and the first overvoltage protection devices are uniformly distributed on one end of a commutator segment of the commutator in an annular shape.

3. The anti-jamming motor for a multi-slot automobile windshield washer pump according to claim 2, wherein the first overvoltage protection device is a resistor element, and the resistor element is a piezoresistor.

4. The anti-interference motor for the multi-groove automobile windshield washer pump according to claim 1, wherein an anti-interference circuit is arranged on the end cover assembly, and the anti-interference circuit is a filter circuit.

5. The anti-jamming motor for a multi-groove automobile windshield washer pump according to claim 4, wherein the filter circuit is an LC filter circuit.

6. The anti-interference motor for the multi-groove automobile windshield washer pump according to claim 5, wherein the LC filter circuit is an LC parallel connection circuit.

7. The anti-interference motor for the multi-groove automobile windshield washer pump according to claim 6, wherein the number of the capacitors and the number of the inductors in the LC parallel circuit are two respectively.

8. The anti-jamming motor for a multi-slot automobile windshield washer pump according to claim 7, wherein the commutator is connected in series between the two inductors, and the two capacitors are respectively connected in parallel with the commutator.

9. The anti-jamming motor for a multi-groove automobile windshield washer pump according to claim 1, wherein the filter circuit is further connected with a second overvoltage protection device in parallel.

10. The anti-jamming motor for a multi-slot automobile windshield washer pump according to claim 9, wherein the second overvoltage protection device is a TVS element.