Position sensor of a motor

Abstract

The position sensor of the motor of the present application discloses a new structure that can realize motor miniaturization, characterized in that it comprises: a shell, which is hollow and forms an accommodation space along the hollow; a grounding ring, which penetrates the inner circumferential surface of the shell; a first PCB, which is arranged in the accommodation space and internally forms a first circuit part to which a voltage is applied; a sensing part, which is arranged opposite the first PCB to perform rotational movement; a connecting bush, which is embedded in the shell and electrically connected to the grounding ring through a fastening part; and a relay part, which is arranged in the accommodation space to electrically relay the grounding ring and the connecting bush; wherein the grounding ring is formed by a main body, a contact part and a first connecting part, the main body penetrates the inner circumferential surface of the shell, the contact part is formed on one side of the main body and arranged in the hollow, and the first connecting part extends from the other side of the main body to contact the relay part in the accommodation space, and the induced current generated by the rotation of the shaft penetrating the hollow is discharged to the ground.

Description

Technical Field

[0001] This invention relates to a position sensor, and more specifically, to a position sensor for a motor that measures position by means of changes in a magnetic field and is mounted on one side of a vehicle motor. Background Technology

[0002] Electric vehicles or hybrid vehicles use brushless motors that do not use brushes. In this case, a position sensor is necessary to determine the current position of the motor.

[0003] In the past, this type of position sensor had a coil and a rotor mounted on the shaft. The change in the area of ​​the metal system formed by the rotor and the coil causing the coil's inductance value changed, and the change in inductance value was converted into an electrical signal to detect the rotational displacement of the shaft.

[0004] At this point, the magnitude of the voltage induced in the rotor is proportional to the magnitude of the magnetic field applied to the coil. In order to detect the precise position, a high voltage is applied to the stator, thereby reducing efficiency. In order to ensure sufficient capacitance, a motor larger than a predetermined size is used, thus resulting in design limitations and increased production costs.

[0005] In addition, according to the electrical control used to control the motor speed, an induced voltage is generated on the shaft. In the past, if the induced voltage on the shaft reached a predetermined level or higher, it would discharge to the ground through the bearing. However, this caused problems such as sparks and bearing damage. Therefore, a shaft grounding ring is used to discharge this voltage to the ground.

[0006] Consequently, the space occupied by the motor in electric vehicles increases, leading to problems such as increased space utilization and design limitations in automobiles. This also significantly increases the necessity and demand for miniaturization of motors used in electric vehicles. Summary of the Invention

[0007] The problem to be solved

[0008] The embodiments of the present invention are proposed to solve the problems described above, with the aim of integrating the grounding ring into the motor without increasing the voltage of the output pattern, thereby achieving miniaturization of the motor for automobiles.

[0009] Problem-solving methods

[0010] The position sensor for a motor of the present invention includes: a housing forming a hollow space, and a receiving space formed along the hollow space; a grounding ring extending through the inner circumferential surface of the housing; a first PCB disposed in the receiving space, and forming a first circuit portion to which a voltage is applied; a sensing portion disposed opposite to the first PCB for rotational movement; a connecting bushing embedded in the housing and electrically connected to ground via a fastening member; and a relay portion disposed in the receiving space to electrically relay the grounding ring and the connecting bushing; wherein the grounding ring is formed by a body, a contact portion and a first connecting portion, the body extending through the inner circumferential surface of the housing, the contact portion formed on one side of the body and disposed in the hollow space, the first connecting portion extending from the other side of the body to contact the relay portion in the receiving space, and discharging to ground an induced current generated by the rotational movement of the shaft extending through the hollow space.

[0011] The first circuit section may be formed by an output pattern and a plurality of receiving patterns. The output pattern is subjected to voltage from the outside, and the plurality of receiving patterns are subjected to voltages with different phases from each other through the rotational movement of the sensing section.

[0012] The accommodating space can be divided into a first accommodating space and a second accommodating space. The first accommodating space is used to install the first PCB, and the second accommodating space is used to install the relay part, so as to distinguish the first PCB and the relay part. The connecting bushing is formed by a fixing part and a second connecting part. The fixing part is embedded in the housing to fasten the fastening component. The second connecting part extends from the fixing part to contact the relay part in the second accommodating space. The connecting bushing can be electrically connected to the contact part through the relay part.

[0013] The position sensor of the motor may further include a terminal, which is electrically connected to the first circuit section and an external device; preferably, a first through hole is formed on one side of the first PCB to electrically connect the first circuit section and the terminal.

[0014] The sensing element may be formed by a fixed ring and sensing fins, the fixed ring being fixed to the outer peripheral surface of the shaft, and the sensing fins extending from the fixed ring and being intermittently formed to generate induced voltages in the plurality of receiving patterns.

[0015] The relay section is formed by a second PCB, which is disposed in the second accommodating space and forms a second circuit section inside it that is connected to the first connecting section and the second connecting section. Alternatively, the relay section may be formed by a conductor section, which is disposed in the second accommodating space and contacts the first connecting section and the second connecting section.

[0016] The position sensor of the motor may further include a cover, which is formed to cover the first and second accommodating spaces; preferably, the cover is formed by a top cover and a coating, the top cover being formed on one side of the first accommodating space and the coating being formed on one side of the second accommodating space.

[0017] The conductor insert is injection molded inside the housing to form the receiving space.

[0018] The effects of the invention

[0019] As described above, the means of solving the problem according to the present invention can achieve various effects, including the following. However, the present invention is not valid only if all of these effects are realized.

[0020] The position sensor of the motor of the present invention detects position by means of the phase difference of the waveform of the voltage applied to the receiving pattern. It can use relatively fewer inductors, thus achieving miniaturization, and reduces the number of turns of the output pattern to reduce resistance, thereby preventing the temperature of the position sensor from rising.

[0021] Therefore, instead of increasing the voltage of the output pattern, the frequency of the voltage of the output pattern is increased, and the resulting eddy currents more effectively cancel the magnetic field induced by the receiving pattern, thereby improving the measurement accuracy.

[0022] In addition, the outer casing houses the first PCB and the relay section, and a cover is formed on one side of the housing space to prevent short circuits with surrounding components and to prevent impurities from entering, thereby achieving a more stable electrical connection and improving the reliability and durability of the product.

[0023] In addition, the relay unit is integrated with the first PCB for measuring the motor position within the housing space, eliminating the need for a separate fixing process for the grounding ring, thereby improving product productivity while achieving motor miniaturization.

[0024] In addition, placing the sensing element on the outside of the housing prevents the position sensor from overheating due to rotation, improving the accuracy of temperature measurement and significantly extending the product's lifespan. Attached Figure Description

[0025] Figure 1 This is a perspective view of the position sensor of the motor according to the first embodiment of the present invention.

[0026] Figure 2 yes Figure 1 An exploded 3D diagram.

[0027] Figure 3 Is Figure 1 A perspective view excluding the sensor and cover.

[0028] Figure 4 Is Figure 3 A 3D view of the Lieutenant General's first PCB, excluding the relay section.

[0029] Figure 5 yes Figure 3 A three-dimensional cross-sectional view along the V-V direction.

[0030] Figure 6 yes Figure 2 A 3D diagram of the grounding ring.

[0031] Figure 7 yes Figure 2 A three-dimensional view of the first PCB from another direction.

[0032] Figure 8 This is a perspective view of the relay unit from the position sensor of the motor, excluding the sensing unit, according to the second embodiment of the present invention.

[0033] Figure 9 It is Figure 8 A perspective view excluding the sensing part and the cover part.

[0034] Figure 10 yes Figure 9 A three-dimensional cross-sectional view along the X-X direction. Detailed Implementation

[0035] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, in order to prevent the key points of the present invention from being unclear, specific descriptions of well-known functions or structures will be omitted. For ease of explanation, the direction extending through the hollow axis is defined as the extension direction X, and the direction perpendicular to the central axis of the hollow is defined as the radial direction Y.

[0036] Furthermore, since the first and second embodiments of the present invention include the same structure for the same purpose, in order to avoid repeated description, the structure described in the first embodiment will not be described in the second embodiment, and the same reference numerals will be used for the same structure.

[0037] Figure 1 This is a perspective view of the position sensor of the motor according to the first embodiment of the present invention; Figure 2 yes Figure 1 Exploded 3D diagram; Figure 3 Is Figure 1 A perspective view excluding the sensor and cover. Figure 4 Is Figure 3 A 3D view of the first PCB of the Lieutenant General, excluding the relay section; Figure 5 yes Figure 3 A three-dimensional cross-sectional view along the V-V direction; Figure 6 yes Figure 2 A 3D diagram of the grounding ring; Figure 7 yes Figure 2 A three-dimensional view of the first PCB from another direction.

[0038] Reference Figures 1 to 7 The motor position sensor 10 of the first embodiment of the present invention includes: a housing 100, which is hollow and has a receiving space 110 formed along the hollow; a grounding ring 200, which penetrates the inner peripheral surface of the housing 100; a first PCB 300, which is disposed in the receiving space 110 and has a first circuit portion 310 for which a voltage is applied formed inside; and a sensing portion 400, which is connected to the first PCB. The 300 components are arranged in opposite directions and rotate; a connecting bushing 500 is embedded in the housing 100 and electrically connected to the ground via a fastening component; a relay part 600 is disposed in the receiving space 110 and electrically relays the grounding ring 200 and the connecting bushing 500; wherein, the grounding ring 200 is formed by a main body 210, a contact part 220 and a first connecting part 230, the main body 210 penetrates the inner circumferential surface of the housing 100, the contact part 220 is formed on one side of the main body 210 and in the hollow, the first connecting part 230 extends from the other side of the main body 210 to contact the relay part 600 in the receiving space 110, and the grounding ring 200 discharges to the ground through the induced current generated by the rotational movement of the shaft 1 penetrating the hollow.

[0039] Preferably, the position sensor 10 of the motor further includes a terminal 700 and a cover 800. The terminal 700 is electrically connected to the first circuit section 310 and an external device. The cover 800 is formed to cover the first and second accommodating spaces 111 and 112. The relay section 600 may be composed of a second PCB 600 in which a second circuit section 610 is formed.

[0040] The purpose of the position sensor 10 for the motor of the present invention is to measure the current position of the motor by means of the phase difference of the induced voltages with different phases applied by the sensing unit 400, and to achieve miniaturization of the motor by forming a grounding ring 200 on one side.

[0041] The outer casing 100 forms a hollow through which the shaft 1 passes. Along the hollow, a receiving space 110 is formed to accommodate the first PCB 300 and the relay part 600. The first PCB 300, which acts as the stator of the motor position sensor 10, and the grounding ring 200, which eliminates the induced voltage generated on the shaft 1, are integrated into one unit.

[0042] At this time, the hollow is formed to have a larger cross-sectional area than the shaft 1, so that the outer shell 100 does not contact the shaft 1, but only the contact part 220 formed on the inner side of the hollow contacts the outer peripheral surface of the shaft 1 at a pre-designed position.

[0043] The accommodating space 110 is formed into a ring along the hollow and divided into a first accommodating space 111 for the first PCB 300 and a second accommodating space 112 for the relay section 600. Thus, the first and second accommodating spaces 111 and 112 have a ring-shaped portion, i.e., an arc shape. In order to maximize the contact area between the contact section 220 and the shaft 1, it is preferable that the second accommodating space 112 is larger than the first accommodating space 111.

[0044] Additionally, the housing 100 forms an extension 120 that extends along the outer peripheral surface of the housing 100 and is embedded in the bushing 3 of the motor, which is fixed by fastening components. In order to stably fix the housing 100, the extension 120 is preferably formed in all directions, and in order to form an integral part with the grounding ring 200 and the connecting bushing 500, the housing 100 is preferably formed of an insertable injection moldable plastic.

[0045] Thus, in the case where a bushing 3 is embedded inside the extension 120, and the bushing 3 formed outside the second receiving space 112 in the embedded bushing 3 is formed by a connecting bushing 500 having a second connecting portion 520 formed as the second receiving space 112.

[0046] Here, the bushing 3 is hollow and embedded in the housing 100 to enhance physical rigidity when the housing 100 is fixed by fastening components, so that the housing 100 can be fixed more firmly; the connecting bushing 500 has the same function as the bushing 3 and forms a second connecting part 520 that is electrically connected to the relay part 600, which will be explained later.

[0047] The grounding ring 200 is formed by a main body 210, a contact portion 220 and a first connecting portion 230. The main body 210 is formed through the inner peripheral surface of the outer shell 100. The contact portion 220 is formed on one side of the main body 210 and is hollow. The first connecting portion 230 extends from the other side of the main body 210 and is formed in the receiving space 110. The grounding ring 200 transmits the induced voltage generated by the rotational movement of the hollow shaft 1.

[0048] The main body 210 is formed by an inner main body 211 and an outer main body 212. The inner main body 211 penetrates the inner circumferential surface of the outer shell 100 and is exposed to the hollow. The outer main body 212 is formed in the second receiving space 112. The inner main body 211 protrudes further in the extension direction X than the outer main body 212, providing space for the formation of the contact portion 220 while allowing the inner circumferential surface of the outer shell 100 to contact the outer surface of the inner main body 211, thereby strengthening the fixing force between the outer shell 100 and the grounding ring 200.

[0049] In other words, in order to discharge the induced voltage generated by the rotational motion of shaft 1 to the ground, it is unavoidable that the main body 210 penetrates the inner circumferential surface of the outer shell 100. Therefore, in order to ensure a predetermined or greater bonding force with the outer shell 100, the inner main body 211 protrudes to increase the contact area with the outer shell 100.

[0050] The contact portion 220 is formed on the inner side of the inner body 211 and contacts the outer side of the hollow shaft 1. Specifically, in order to eliminate the induced voltage generated on the shaft 1, the contact portion 220 is made of conductive filaments or conductive wires and is elastic, so that it can stably contact the outer side of the shaft 1 regardless of whether the shaft 1 rotates in the forward or reverse direction. It is preferably made of carbon fiber so that it can maintain a predetermined durability and lifespan even under repeated rotation.

[0051] The first connecting portion 230 extends from the outer body 212 toward the second receiving space 112 and is electrically connected to the relay portion 600. In the first embodiment, the position sensor 10 of the motor is formed by the relay portion 600 being formed from the second PCB 600. Therefore, the first connecting portion 230 is preferably formed by protruding through the second PCB 600 in the extending direction, and can be connected to the second circuit layer inside the second PCB 600.

[0052] At this time, the grounding ring 200 can be integrated with the housing 100 by insert injection molding, thereby eliminating the process of fixing the grounding ring 200 separately in the motor. This simplifies the manufacturing process, increases productivity, and achieves miniaturization, ultimately improving vehicle fuel efficiency.

[0053] The first PCB 300 has a first circuit section 310 forming a pattern, a through hole 320 connecting the terminal 700, and an IC section 330 connected to the circuit section. The displacement of the induced voltage applied to the first circuit section 310 is converted into an electrical signal and transmitted to an external device.

[0054] The first circuit section 310 is composed of an output pattern 311 and a plurality of receiving patterns 312. The output pattern 311 is subjected to voltage by the IC section 330, and the plurality of receiving patterns 312 are modulated by the sensing section 400. The first circuit section 310 converts the phase difference of the induced voltages with different phases applied to the receiving patterns 312 into an electrical signal and transmits it to an external device.

[0055] Thus, multiple receiving patterns 312 with different shapes can be formed to be subjected to voltages with different phases. Preferably, two patterns are formed to receive the applied voltage with a cosine wave phase having a 90-degree phase difference and a sinine wave phase.

[0056] Specifically, the voltages of the cos wave and the sin wave applied to two different receiving patterns 312 are continuously modulated in phase as the sensing unit 400 rotates, and the position is measured by the phase difference between the modulated voltages of the cos wave and the sin wave.

[0057] Accordingly, the position sensor 10 of the original invention measures the position more accurately by applying the phase difference of the voltages applied to two different receiving patterns 312, without increasing the magnitude of the voltage applied to the receiving patterns 312.

[0058] Therefore, instead of increasing the voltage applied to the first PCB 300, only the frequency is increased, thus better canceling the magnetic field induced in the receiving pattern 312 by the movement of the sensing unit 400, thereby improving measurement accuracy. In addition, using relatively fewer inductors to measure position reduces the number of turns in the output pattern 311, thus enabling miniaturization of the motor position sensor 10.

[0059] At this time, as the number of turns (length) of the output pattern 311 is reduced, the resistance is also reduced, which in turn reduces the temperature rise of the first PCB 300, thus providing improved durability and extended lifespan.

[0060] The IC unit 330 receives power from an external device, applies the power to the output pattern 311, and converts each phase of the induced voltage applied to the plurality of receiving patterns 312 into an electrical signal for reception and retransmission to the external device.

[0061] At this time, a through-hole 320 is formed on one side of the first PCB 300 to facilitate the installation of the terminal 700 connected to an external device. Thus, the through-hole 320 allows the first circuit section 310, which connects the first PCB 300 to the IC section 330, to be internally connected to the terminal 700. However, the first circuit section 310 connected to the terminal 700 can vary depending on the design and is not shown separately in the accompanying drawings.

[0062] The sensing element 400 is formed by a fixing ring 410 and a sensing fin 420. The fixing ring 410 is fixed to the outside of the shaft 1 and is hollow. The sensing fin 420 extends from the fixing ring 410. The sensing element 400 rotates together with the shaft 1 to modulate the induced voltage applied to the receiving pattern 312. For this purpose, the sensing element 400 and the fixing element are arranged facing each other. In order to modulate the induced voltage, the sensing fin 420 contains a conductive material and extends intermittently from the outer peripheral surface of the fixing ring 410 in the radial direction Y.

[0063] The fixing ring 410 is a structure fixed to the outside of the shaft 1, forming a hollow with the same size as the cross-sectional area of ​​the shaft 1. Multiple fixing protrusions 411 are formed at predetermined intervals on the inner side of the hollow to improve the fixing force with the shaft 1.

[0064] The sensing fin 420 is formed symmetrically or asymmetrically with respect to the central axis of axis 1, so that the area of ​​the sensing fin 420 facing each other at a specific position on the first PCB 300 changes over time through rotational movement.

[0065] In addition, the sensor 400 is positioned at a predetermined distance on one side of the housing 100 to more effectively release the heat generated by the rotational motion, and a structure such as a cover is formed on one side of the sensor 400, that is, on the side not facing the first PCB 300, to protect the sensor 400.

[0066] Specifically, in one embodiment, the sensing wing 420 is alternately spaced with the central axis of axis 1 to form a space between the sensing wing 420 and the sensing wing 420. The sensing wing 420 is formed symmetrically in all four directions, so that the area of ​​the sensing wing 420 facing each other at a specific position of the first PCB 300 during the rotational movement of the sensing part 400 changes repeatedly over time.

[0067] However, this is one embodiment of the sensing unit 400, and the sensing wing 420 can be formed in various shapes.

[0068] The connecting bushing 500 is composed of a fastening hole 510 and a second connecting portion 520. The fastening hole 510 is for fastening components to pass through, and the second connecting portion 520 is formed as a second receiving space 112 extending from one side of the fastening hole 510. The connecting bushing 500 is embedded in the extension portion 120 of the housing 100, connecting the housing 100 to the motor body while being electrically connected to the contact portion 220 through the second circuit portion 610.

[0069] Specifically, the connecting bushing 500 is configured such that the fastening hole 510 is exposed in the extension 120, and the second connecting portion 520 extends from one side of the fastening hole 510, penetrates the housing 100 to form the second receiving space 112, and then connects to the second circuit section 610. At this time, in order to facilitate electrical connection with the second circuit section 610, the second connecting portion 520 protrudes in the extending direction X through the second PCB 600, and then contacts the second circuit section 610.

[0070] In other words, the connecting bushing 500 is electrically connected to the second circuit section 610 on one side, receives the induced voltage generated by the rotational movement of the shaft 1, and discharges the induced voltage to ground through the fastening member that passes through the fastening hole 510, thereby stabilizing the discharge and preventing damage to other components.

[0071] In addition, the connecting bushing 500 can be integrally formed with the housing 100 by insert injection molding, so no additional process is required, and the second connecting part 520 is firmly fixed, thereby connecting more stably with the second circuit part 610.

[0072] Therefore, the position sensor 10 of the motor of the present invention extends a portion of the bushing 3 fixed in the motor body to serve as a connecting bushing 500, thereby not adding any additional structure and thus not increasing the manufacturing cost.

[0073] The relay section 600 is a structure provided in the second receiving space 112 to relay the electrical connection between the first connection section 230 and the second connection section 520. The relay section 600 in the first embodiment is formed by a second PCB 600 that internally constitutes a second circuit section 610.

[0074] The second PCB 600 has a second circuit section 610 formed inside, which is connected to the first connection section 230 and the second connection section 520 that pass through the second PCB 600, thereby eliminating the induced voltage generated on the shaft 1. At this time, the second circuit section 610 can be formed with various patterns according to the design, so it can be easily connected even when the positions of the first and second connection sections 230 and 520 are spaced apart from each other.

[0075] In addition, a Zener diode 620 is formed on one side of the second PCB 600, which can transmit voltage from the first connection portion 230 to the second connection portion 520. However, the reverse voltage generated by the motor and applied through the second connection portion 520 is not transmitted to the first connection portion 230, thus preventing reverse voltage that can be transmitted from the vehicle body and ensuring safety.

[0076] In other words, the position sensor 10 of the motor in the first embodiment is formed by a relay part 600 of the second PCB 600, which makes the connection between the first and second connection parts 230 and 520 more stable, while setting a Zener diode 620 to block reverse voltage transmission, thereby ensuring safety.

[0077] The cover 800 is a structure formed on one side of the accommodating space 110 to protect the first PCB 300 and the relay 600 from external foreign objects or impacts. It can completely cover the first and second accommodating spaces 111 and 112, or it can be formed to cover any one of the first and second accommodating spaces 111 and 112 as needed.

[0078] Preferably, in order to make the connection process between the terminal 700 and the first PCB 300 easier, a cover portion 800, such as a housing 100, is formed on one side of the first receiving space 111, and a coating 820 is formed on the second receiving space 112, which includes the first and second connecting portions 230 and 520 penetrating the second PCB 600, thereby fixing the connection portion between the first and second connecting portions 230 and 520 and the second circuit portion 610 while protecting the second PCB 600 from the outside.

[0079] Here, coating 820 can be formed using epoxy resin. After the second PCB 600 is installed, molten coating liquid is injected and then cured to form coating 820 that fills the second accommodating space 112. Accordingly, the fixing force between the grounding ring 200 and the housing 100 is improved, and the connection between the second PCB 600 and the first and second connecting parts 230 and 520 is also strengthened, thereby improving product durability.

[0080] However, the cover 800 can be formed entirely of the first and second receiving spaces 110 using the top cover 810 or the coating 820, and the top cover 810 or the coating 820 can be used interchangeably depending on the design.

[0081] Therefore, the position sensor 10 of the motor of the present invention measures the position by the phase difference of the induced voltage without the need to add an inductor, and forms a new structure by integrating the grounding ring 200, thereby realizing the miniaturization of the motor.

[0082] In addition, the voltage generated by the rotational movement of the shaft 1 is eliminated by the connecting bushing 500 of the fixed housing 100, thus eliminating the need to increase the number of required parts to eliminate the voltage, thereby solving the problem of increased production costs.

[0083] Figure 8 This is a perspective view of the relay unit from the position sensor of the motor, excluding the sensing unit, according to the second embodiment of the present invention. Figure 9 It is Figure 8 A perspective view excluding the sensing part and the cover part; Figure 10 yes Figure 9 A three-dimensional cross-sectional view along the X-X direction.

[0084] Reference Figures 8 to 10 The position sensor 20 of the motor according to the second embodiment of the present invention is characterized in that the relay part 2600, which is electrically connected to the relay grounding ring 200 and the connecting bushing 500, is provided in the second receiving space 112 and is formed by a conductor part 2600 that contacts the first connecting part 230 and the second connecting part 520.

[0085] The position sensor of the motor in the second embodiment of the present invention differs from the position sensor 10 in the first embodiment in that the relay unit 2600 is used. Therefore, in order to avoid repetition, only the relay unit 2600 will be described. For the sake of understanding, the same reference numerals are used for the same structure.

[0086] The relay section 2600 in the second embodiment is an electrically connectable conductor section 2600, which can be composed of a busbar, terminal, pin, or wire that directly connects the first connecting section 230 and the second connecting section 520. In this case, the conductor section 2600 only has a structure that connects the first and second connecting sections 230 and 520, thus further reducing the weight of the motor and ultimately improving the fuel efficiency of the vehicle.

[0087] In addition, the operator can directly visually confirm the connection between the relay unit 2600 and the first and second connection units 230 and 520, thus making it highly operable. Furthermore, by eliminating the second PCB 600, the cost and time required for product production are saved, thereby improving productivity.

[0088] At this time, the relay unit 600 can be extended from the first connecting part 230 or the second connecting part 520 to form an integral unit, thus simplifying the connection process and maximizing the productivity of the product.

[0089] Therefore, in the second embodiment of the present invention, the position sensor of the motor is formed by a conductor portion 2600 directly connected to the first and second connecting portions 230 and 520, forming a relay portion 2600. This can save the cost required for product production. Furthermore, the welding, fusion and other processes used to integrate and electrically connect the first connecting portion 230 or the second connecting portion 520 with the relay portion 2600 are minimized, improving operability. Therefore, it has the effect of significantly improving product productivity.

[0090] At this time, in order to form the conductor portion 2600 in the receiving space 110, the conductor portion 2600 can be inserted and injection molded inside the housing 100. Accordingly, there is no separate cover portion 800, and the conductor portion 2600 can also be set inside the second receiving space 112, thus simplifying the production process.

[0091] In summary, the position sensor 10 of the motor of the present invention forms a grounding ring 200 to eliminate the induced voltage generated by the rotational motion of the shaft 1, thereby achieving miniaturization of the motor. To this end, a new structure and various structures for implementing this structure are formed, thereby significantly improving productivity and durability.

[0092] The preferred embodiments of the present invention have been illustrated above. However, the scope of the present invention is not limited to the specific embodiments described above, but rather any appropriate modifications within the scope of the claims are within the protection scope of the present invention.

Claims

1. A position sensor for a motor, characterized in that, include: The outer shell is hollow, and a receiving space is formed along the hollow. A grounding ring is formed by penetrating the inner circumferential surface of the outer casing; A first PCB is disposed in the receiving space and a first circuit section in which voltage is applied is formed; The sensing unit is arranged facing the first PCB to perform rotational motion; The connecting bushing is embedded in the housing and connected to the ground via fastening components; and A relay unit is provided in the accommodating space to provide electrical relay between the grounding ring and the connecting bushing; The grounding ring is formed by a main body, a contact portion and a first connecting portion. The main body extends through the inner circumferential surface of the outer shell. The contact portion is formed on one side of the main body and disposed in the hollow space. The first connecting portion extends from the other side of the main body to contact the relay portion in the receiving space, and releases the induced current generated by the rotational movement of the shaft through the hollow space to the ground.

2. The position sensor for the motor according to claim 1, characterized in that, The first circuit section is formed by an output pattern and a plurality of receiving patterns. The output pattern is subjected to voltage from the outside, and the plurality of receiving patterns are subjected to voltages with different phases from each other through the rotational movement of the sensing section.

3. The position sensor for a motor according to claim 1, characterized in that, The accommodating space is divided into a first accommodating space and a second accommodating space. The first accommodating space is used to install the first PCB, and the second accommodating space is used to install the relay unit, so as to distinguish the first PCB from the relay unit. The connecting bushing is formed by a fixing part and a second connecting part. The fixing part is embedded in the housing to fasten the fastening component. The second connecting part extends from the fixing part to contact the relay part in the second receiving space. The connecting bushing is electrically connected to the contact part through the relay part.

4. The position sensor for a motor according to claim 1, characterized in that, Also includes: The terminal is electrically connected to the first circuit section and an external device. A first through hole is formed on one side of the first PCB to electrically connect the first circuit section and the terminal.

5. The position sensor for a motor according to claim 2, characterized in that, The sensing element is formed by a fixed ring and sensing fins. The fixed ring is fixed to the outer circumferential surface of the shaft, and the sensing fins extend from the fixed ring and are intermittently formed to generate induced voltages on the plurality of receiving patterns.

6. The position sensor for a motor according to claim 3, characterized in that, The relay section is formed by a second PCB, which is disposed in the second accommodating space and forms a second circuit section inside it that is connected to the first connecting section and the second connecting section; A Zener diode is formed on the second PCB to prevent reverse voltage.

7. The position sensor for a motor according to claim 3, characterized in that, The relay section is formed by a conductor section, which is disposed in the second receiving space and contacts the first connection section and the second connection section.

8. The position sensor for a motor according to claim 3, characterized in that, Also includes: The cover is formed to cover the first accommodating space and the second accommodating space.

9. The position sensor for a motor according to claim 8, characterized in that, The cover is formed by a top cover and a coating, the top cover being formed on one side of the first receiving space and the coating being formed on one side of the second receiving space.

10. The position sensor for a motor according to claim 7, characterized in that, The contact portion is made of carbon fiber or conductive fiber and is formed of elastic filaments; The conductor insert is injection molded inside the housing to form in the second receiving space.

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