KR102158263B1 - Motor - Google Patents

Abstract

The motor is started. The motor, the housing; A stator disposed in the housing; A rotor disposed rotatably with respect to the stator; A sensing magnet module installed on the upper side of the rotor and detecting a position of the rotor; A printed circuit board on which a magnetic element disposed facing the sensing magnet module is mounted to sense a magnetic force of the sensing magnet module; And a filter unit connecting the printed circuit board and the housing and blocking signals of a specific frequency band.

Description

Motor {MOTOR}

The present invention relates to a motor, and more particularly, to a motor that receives power and generates a high-speed rotational force.

The motor includes a rotating shaft, a rotor including a magnet formed on the rotating shaft, and a stator including a coil wound around a core disposed around the rotor to generate an electromagnetic force by electric current.

Some motors whose rotational speed and rotational speed are important factors may have a sensing magnet that counts the rotational speed of the rotational shaft at the end of the rotational shaft, and the magnetic field generated from the sensing magnet is detected at a position facing the sensing magnet. A magnetic element for calculating the actual rotational speed and rotational speed of the rotation shaft is disposed.

The magnetic device may be mounted on a printed circuit board and disposed inside the motor housing. When the motor is driven, an electromagnetic field generated by the rotation of the rotor causes noise. There is a problem in that noise caused by driving the motor affects the printed circuit board directly connected to the housing, thereby deteriorating the accuracy and reliability of operation.

An object of the present invention is to provide a motor capable of improving the accuracy and reliability of a sensing magnet module and a magnetic element by removing electrical and magnetic noise generated by rotation of a rotor when driving a motor.

According to an aspect of the invention, the housing; A stator disposed in the housing; A rotor disposed rotatably with respect to the stator; A sensing magnet module installed on the upper side of the rotor and detecting a position of the rotor; A printed circuit board on which a magnetic element disposed facing the sensing magnet module is mounted to sense a magnetic force of the sensing magnet module; And a filter unit connecting the printed circuit board and the housing and blocking signals of a specific frequency band.

The filter unit may have a high-pass filter (HFP) characteristic.

The filter unit may have a band-stop filter (BSF) characteristic.

The filter unit may be implemented with at least one of a lumped parameter circuit and a PCB pattern.

The PCB pattern may be implemented in a microstrip or stripline method.

The printed circuit board may be coupled to an inner surface of a bracket coupled to an upper end of the motor housing.

The filter unit may block a signal in a frequency band of 70 to 80 MHz.

The motor according to the present invention can improve the accuracy and reliability of the sensing magnet module and the magnetic device by removing electrical and magnetic noise generated by the rotation of the rotor when the motor is driven.

1 is a cross-sectional view of a motor according to an embodiment of the present invention;
2 is an exploded view of a motor according to an embodiment of the present invention,
3 is a view for explaining a connection relationship between a printed circuit board, a filter unit, and a housing according to an embodiment of the present invention;
4 is a conceptual diagram of a filter unit according to an embodiment of the present invention;
5 is a conceptual diagram of a filter unit according to another embodiment of the present invention, and
6 is a graph illustrating a frequency response characteristic of a filter unit according to an embodiment of the present invention.

The present invention is intended to illustrate and describe specific embodiments in the drawings, as various changes may be made and various embodiments may be provided. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers, such as second and first, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may be referred to as a second component. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, but the same reference numerals are assigned to the same or corresponding components regardless of the reference numerals, and redundant descriptions thereof will be omitted.

1 is a cross-sectional view of a motor according to an embodiment of the present invention, FIG. 2 is an exploded view of a motor according to an embodiment of the present invention, and FIG. 3 is a printed circuit board, a filter unit, and a housing according to an embodiment of the present invention. It is a diagram for explaining the connection relationship.

1 to 3, a motor according to an embodiment of the present invention may include a housing, a stator, a rotor, a sensing magnet module, a printed circuit board, and a filter unit.

First, the housing 10 may be formed as a tube having a circular cross section having an accommodation space therein and having a predetermined diameter in the longitudinal direction. The bracket 11 is coupled to the upper end of the housing 10, so that the motor 100 according to an embodiment of the present invention may have a cylindrical shape.

However, unlike this, the cross section of the housing 10 may be formed in a polygonal shape, and may be manufactured in various shapes according to the shape of the stator 20. The bracket 11 is coupled to the upper end of the housing 10 and may be manufactured in a shape corresponding to the upper circumference of the housing 10.

The bracket 11 may be provided with a shear bearing 61 and a coupler 70 to support the rotation of the rotation shaft 50.

The stator 20 may be installed in the interior receiving space of the housing 10 to generate magnetic force. The stator 20 is disposed adjacent to the inner circumferential surface of the housing 10 and may include a coil 21 wound around the core.

Both ends of the stator 20 are open, and a circular accommodation space in which the rotor 30 is rotatably accommodated may be formed in the center. A plurality of slots and teeth may be formed along the circumferential direction of the space accommodating the rotor 30 in the inner diameter portion of the stator 20.

When a current is applied to the stator 20 and magnetic force is generated, the rotor rotates by electromagnetic induction of the rotor 30. At this time, heat is generated in the stator 20 and the rotor 30 due to the high power density. .

A coil terminal of each wound coil is disposed on the upper side of the stator 20 for coupling of a busbar 40, and the busbar 40 is connected to the coil terminal. In the bus bar 40, a plurality of metal members electrically connected to the coil terminals may be insulated and fixed by an insulator. The bus bar may have a donut shape and may be formed to correspond to the upper surface of the stator. Terminals for connection with coil terminals are arranged on the outer circumferential surface of the busbar. The shape of the bus bar may vary depending on the connected power line 41.

The rotor 30 may be composed of a so-called induction rotor having a rotor core, a plurality of conductor bars coupled to the rotor core, and an end ring connecting the conductor bars to be energized.

The rotation shaft 50 may be integrally rotatably coupled to the center of the rotor core. In one embodiment of the present invention, a case where the rotor 30 is configured as an induction rotor is exemplified, but may be configured using a so-called permanent magnet rotor having a permanent magnet. A front bearing 61 and a rear bearing 62 may be coupled to both ends of the rotation shaft 50 on the rotation shaft 50, respectively.

In addition, the rotor 30 may be configured as a synchronous rotor using a difference in magnetoresistance, and may be configured as a hybrid rotor including a difference in magnetoresistance and a permanent magnet at the same time.

The sensing magnet module 80 may include a plate and a sensing magnet. The plate may have a disk shape, for example, and a sensing magnet may be fixed to the upper side. The sensing magnet may be provided in a donut shape having a hole in the center.

The magnetic element 91 may be installed on the printed circuit board 90 to face the sensing magnet by sensing a change in the magnetic field of the sensing magnet. The printed circuit board 90 is disposed above the rotor 30 and the sensing magnet module 80 and is coupled to the inner surface of the bracket 11 to be provided inside the housing 10.

The filter unit 100 connects the printed circuit board 90 and the housing 10 to block signals of a specific frequency band. The filter unit 100 may be implemented using at least one of a lumped parameter circuit method in which an electronic device is electrically arranged on a PCB substrate and a PCB pattern method in which a transmission line pattern is implemented on a PCB circuit. have.

The filter unit 100 may block a signal in a specific frequency band in order to remove conduction noise and radiation noise due to an electromagnetic field generated by rotation of the rotor when the motor is driven.

The filter unit 100 can remove conduction noise and radiation noise by blocking a signal in a frequency band of 70 to 80 MHz, for example, and is designed as a high-pass filter (HFP) to provide a frequency of less than 80 MHz. It is designed as a band-stop filter (BSF) to block signals in the band or to selectively block signals in the 70 to 80 MHz frequency band.

4 is a conceptual diagram of a filter unit according to an embodiment of the present invention.

Referring to FIG. 4, the filter unit is connected to the printed circuit board and the housing, and may be implemented as a lumped constant circuit through a combination of a resistance element, a capacitor, an inductor, and an operational amplifier (OP-amp).

4(a) to 4(c) show a filter unit having a high-pass filter characteristic as a lumped constant circuit, and Figs. 4(d) to 4(e) show a lumped constant filter unit having a band elimination filter characteristic. It is implemented as a circuit.

5 is a conceptual diagram of a filter unit according to another embodiment of the present invention.

Referring to FIG. 5, the filter unit may be implemented as a filter by implementing a transmission path in the PCB. The filter unit may be implemented as a microstrip in which a transmission path is patterned on the upper and lower surfaces of the PCB or a stripline in which the transmission path is patterned inside the PCB.

Fig. 5(a) shows a filter unit having a high pass filter characteristic as a PCB pattern, and Fig. 5(b) is a filter unit having a band elimination filter characteristic as a PCB pattern.

The embodiment of the filter unit according to FIGS. 4 to 5 is not limited, and various types having the same frequency response characteristics as a high-pass filter or a band elimination filter capable of blocking a specific frequency band in order to remove noise generated by the rotation of the rotor. That it can be designed as a circuit will be included within the scope of the technical idea of the present invention.

6 is a graph illustrating a frequency response characteristic of a filter unit according to an embodiment of the present invention.

Referring to Fig. 6(a), it can be seen that when the printed circuit board and the housing are directly shorted, the signal level in the 70 to 80 MHz frequency band that generates conduction noise and radiation noise is about 20 (dB). .

However, referring to Fig. 6(b), when the filter unit is connected between the printed circuit board and the housing, the signal level in the frequency band of 70 to 80 MHz that generates conduction noise and radiation noise is reduced to 10 (dB) or less. It can be confirmed.

Accordingly, by removing the noise generated by the driving of the rotor, it is possible to solve many problems when driving the motor caused by this.

The term'~ unit' used in this embodiment refers to software or hardware components such as field-programmable gate array (FPGA) or ASIC, and'~ unit' performs certain roles. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

10: housing
11: bracket
20: stator
30: rotor
40: bus bar
41: busbar power line
50: rotary shaft
61, 62: bearing
70: coupler
80: sensing magnet module
90: printed circuit board
91: magnetic element
100: filter unit

Claims (7)

housing;
A stator disposed in the housing;
A rotor disposed rotatably with respect to the stator;
A sensing magnet module installed on the upper side of the rotor and detecting a position of the rotor;
A printed circuit board on which a magnetic element disposed facing the sensing magnet module is mounted to sense a magnetic force of the sensing magnet module; And
A motor comprising a filter unit connected between the printed circuit board and the housing to reduce a signal level in a frequency band of 70 to 80 MHz to generate conduction noise and radiation noise to 10 (dB) or less.
The method of claim 1,
The filter unit has a high-pass filter (HFP) characteristic.
The method of claim 1,
The filter unit has a band-stop filter (BSF) characteristic.
The method of claim 1,
The filter unit is a motor implemented with at least one of a lumped parameter circuit and a PCB pattern.
The method of claim 4,
The PCB pattern is a motor implemented in a microstrip or stripline method.
The method of claim 1,
The printed circuit board is a motor coupled to an inner surface of a bracket coupled to an upper end of the housing.
The method of claim 1,
The filter unit is a motor that blocks signals in a frequency band of 70 to 80 MHz.

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