Position sensor and motor

Abstract

The utility model discloses a position sensor and a motor, and the position sensor comprises a metal signal panel which is used for being connected with a rotor shaft of the motor; an accommodating groove is formed in one side, facing the metal signal panel, of the first shell along the axial direction, and the accommodating groove and the metal signal panel are arranged at an interval; the signal receiving coil is arranged in the accommodating groove; the signal transmitting coil is arranged in the accommodating groove around the signal receiving coil along the circumferential direction; the conductive part is used for being connected with a controller of the motor, the conductive part is arranged in the containing groove, the signal receiving coil and the signal transmitting coil are arranged on the side, facing the metal signal panel, of the conductive part in the axial direction, the signal receiving coil and the signal transmitting coil are both connected with the conductive part, and the conductive part is not provided with a decoding chip and a peripheral load circuit of the decoding chip. According to the utility model, the cost can be effectively reduced, the problem of possible failure of the decoding chip and the peripheral load circuit thereof in a complex working environment does not need to be considered, and the reliability is relatively high.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field, especially a position sensor and motor. BACKGROUND

[0002] The electric eddy current motor rotor position sensor is a sensor made by using the electric eddy current principle, which calculates the actual position of the rotor by detecting the signal generated by the electric eddy current. The performance requirements of the new energy electric drive system for the motor rotor position sensor are harsh, and its precision and stability are directly related to the accuracy of motor control.

[0003] The motor rotor position sensor known in the market at present adopts the electric eddy current induction principle, and the scheme adopted is that the induction coil, decoding chip and peripheral load circuit are integrally arranged on a printed circuit board (PCB). In the above scheme, since the decoding chip and its peripheral load circuit need to be integrated and arranged on the PCB, the cost is higher and the design is more complex. In addition, the electronic components used by the decoding chip and its peripheral load circuit have higher temperature requirements. If the temperature exceeds a certain range, the decoding chip and its peripheral load circuit may fail, so the reliability of the position sensor provided by the prior art is low. SUMMARY

[0004] The utility model discloses a position sensor, can effectively reduce the cost, and need not consider the problem that decoding chip and its peripheral load circuit can fail in the complex working environment, has higher reliability.

[0005] To solve the above technical problems, the embodiment of the utility model discloses a kind of position sensors, comprising:

[0006] Metal signal disc, for being connected with the rotor shaft of motor;

[0007] First shell, along the axial direction, the side of the first shell towards the metal signal disc is equipped with accommodating groove, and the accommodating groove is spaced apart from the metal signal disc;

[0008] Signal receiving coil, be equipped in the accommodating groove, for receiving the electric eddy current signal generated by the metal signal disc;

[0009] Signal transmitting coil, along the circumferential direction, the signal transmitting coil is equipped in the accommodating groove and surrounds the signal receiving coil, for receiving the pulse signal output by the controller of motor;

[0010] The conductive part is arranged in the accommodating groove and is connected with the controller of the motor, the signal receiving coil and the signal transmitting coil are arranged on the side of the conductive part facing the metal signal disc, and the signal receiving coil and the signal transmitting coil are connected with the conductive part.

[0011] The signal receiving coil and the signal transmitting coil are arranged on the conductive part, the conductive part is connected with the controller of the motor, and the controller of the motor transmits a group of pulse signals (for example, high-frequency pulse signals) to the signal transmitting coil during operation, and the signal receiving coil receives the electromagnetic signals generated by the signal transmitting coil.

[0012] The signal receiving coil and the signal transmitting coil are arranged on the conductive part, the conductive part is connected with the controller of the motor, and the controller of the motor transmits a group of pulse signals (for example, high-frequency pulse signals) to the signal transmitting coil during operation, and the signal receiving coil receives the electromagnetic signals generated by the signal transmitting coil.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses a position sensor, the conductive part includes a connection end and a sensing end, the sensing end is connected with the connection end, the connection end is used for connecting with the controller of the motor, and the signal receiving coil and the signal transmitting coil are arranged on the sensing end.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a position sensor, wherein the first housing includes a mounting hole along the circumferential direction, the sensing end is disposed around the hole wall of the mounting hole, the mounting hole is for the rotor shaft of the motor to pass through, along the radial direction, the hole wall of the mounting hole is spaced apart from the rotor shaft of the motor, and the first housing does not rotate synchronously with the rotor shaft of the motor.

[0015] According to another specific embodiment of the present invention, a position sensor is disclosed, including a first connecting part. The first connecting part includes a first signal transmission part and a second signal transmission part. One end of the first signal transmission part is connected to the signal transmitting coil through the connecting end, and the other end is used to connect to the output end of the controller. One end of the second signal transmission part is connected to the signal receiving coil through the connecting end, and the other end is used to connect to the input end of the controller.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a position sensor, wherein the conductive part includes a PCB board, and both the first signal transmission part and the second signal transmission part include connecting wire harnesses.

[0017] By adopting the above technical solution, the PCB board and the motor controller are connected by a connecting wire harness, which realizes the signal transmission between the PCB board and the motor controller at a low cost. It makes full use of the motor controller to output high-frequency pulse signals to the signal transmitting coil, as well as to receive the eddy current signals collected by the receiving coil and filter and decode the eddy current signals.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a position sensor, wherein the first housing includes a second connecting part, the second connecting part is disposed on the outside of the groove wall of the receiving groove, and is used to connect with the second housing of the motor.

[0019] According to another specific embodiment of the present invention, a position sensor is disclosed, wherein the first housing includes a fixing part, the fixing part and the second connecting part are spaced apart on the outside of the groove wall of the receiving groove, and one end of the connecting wire harness passes through the fixing part and is connected to the connecting end.

[0020] By adopting the above technical solution, and by setting a fixing part, one end of the connecting wire harness passes through the fixing part and connects to the connecting end, the connection stability between the connecting wire harness and the connecting end can be improved.

[0021] According to another specific embodiment of the present invention, a position sensor is disclosed. The fixing part includes a first part and a second part. The first part protrudes from the outside of the groove wall of the receiving groove, and the second part is sleeved on the first part. The second part and the first part together enclose a limiting space. One end of the connecting wire harness passes through the limiting space and is connected to the connecting end.

[0022] The present invention also discloses a motor, which includes at least the position sensor described in any of the above embodiments.

[0023] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an electric motor, the electric motor comprising:

[0024] A second housing is connected to the first housing of the position sensor. A rotor shaft is provided inside the second housing and is connected to the metal signal disk.

[0025] A controller is used to filter and decode eddy current signals and output high-frequency pulse signals. The controller is connected to the conductive part and includes an output terminal and an input terminal. The output terminal is connected to the other end of the first signal transmission part of the position sensor and is used to output high-frequency pulse signals to the signal transmitting coil. The input terminal is connected to the other end of the second signal transmission part of the position sensor and is used to receive eddy current signals collected by the signal receiving coil.

[0026] By adopting the above technical solution, the motor controller is used to filter and decode the signal collected by the signal receiving coil, and the motor controller is used to output a high-frequency pulse signal to the signal transmitting coil, thereby achieving the monitoring of the rotation position of the motor rotor at a low cost. Attached Figure Description

[0027] Figure 1a A simplified schematic diagram of the position sensor, motor controller, and motor connection provided in an embodiment of this application is shown.

[0028] Figure 1b A schematic diagram showing the connection between the position sensor and the motor controller provided in an embodiment of this application is shown.

[0029] Figure 2 A simplified exploded view of the position sensor provided in an embodiment of this application is shown.

[0030] Figure 3 A three-dimensional schematic diagram of the position sensor provided in an embodiment of this application is shown.

[0031] Figure 4A partially enlarged view of the position sensor provided in an embodiment of this application is shown. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0033] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0035] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0038] In some embodiments, see Figure 1a , Figure 1b , Figure 2 and combined Figure 3 This application provides a motor including a position sensor 10, a second housing (not shown in the figure), and a controller 20. The second housing is connected to the first housing 11 of the position sensor 10. A rotor shaft (not shown in the figure) is provided inside the second housing. The rotor shaft is connected to a metal signal disk 13. The rotor shaft and the metal signal disk 13 rotate synchronously. The controller 20 is connected to the conductive part 12 of the position sensor 10 and is used to filter and decode the eddy current signal and output a high-frequency pulse signal. The controller 20 includes an output terminal 201 and an input terminal 202. The output terminal 201 is connected to the other end of the first signal transmission part 1611 of the position sensor 10 and is used to output a pulse signal (e.g., a high-frequency pulse signal) to the signal transmitting coil 14 of the position sensor 10. The input terminal 202 is connected to the other end of the second signal transmission part 1612 of the position sensor 10 and is used to receive the eddy current signal collected by the signal receiving coil 15 of the position sensor 10.

[0039] Understandably, a pulse signal refers to a short-lived signal with large amplitude changes, which usually contains high-frequency components and complex waveforms. Among them, high-frequency pulse signals usually refer to pulse signals with a signal frequency between 3MHz and 30MHz. For example, the signal frequency can be 3MHz, 4MHz, 10MHz, 15MHz, 30MHz, etc. This application does not limit this.

[0040] In some embodiments, see Figure 1b , Figure 2 , Figure 3 This application provides a position sensor 10, including a first housing 11, a conductive part 12, a metal signal disk 13, a signal transmitting coil 14, and a signal receiving coil 15. The metal signal disk 13 is connected to the rotor shaft of a motor and can rotate synchronously with the rotation of the rotor shaft. Exemplarily, along the axial direction X, the first housing 11 has a receiving groove 111 on the side facing the metal signal disk 13, and the receiving groove 111 is spaced apart from the metal signal disk 13. Both the signal receiving coil 15 and the signal transmitting coil 14 are disposed in the receiving groove 111, and along the circumferential direction R, the signal transmitting coil 14 is disposed around the signal receiving coil 15 in the receiving groove 111.

[0041] The conductive part 12 is used to connect with the controller 20 of the motor. The conductive part 12 is disposed in the receiving groove 111 along the axial direction X. The signal receiving coil 15 and the signal transmitting coil 14 are both disposed on the side of the conductive part 12 facing the metal signal disk 13. The signal receiving coil 15 and the signal transmitting coil 14 are both connected to the conductive part 12. The conductive part 12 does not have a decoding chip or its peripheral load circuit. For example, the conductive part 12 and the metal signal disk 13 are spaced 2 mm apart in the axial direction X. It is understood that the embodiments of this application are not limited to this, and for example, it can be 1 mm, 3 mm, 4 mm, 5 mm, etc.

[0042] When the position sensor 10 is working, the motor controller 20 sends a set of high-frequency pulse signals to the signal transmitting coil 14, and the signal receiving coil 15 receives the electromagnetic signals generated by the signal transmitting coil 14. The metal signal disk 13 is connected to the rotor shaft of the motor and rotates simultaneously with the motor rotor. The metal signal disk 13 and the conductive part 12 located in the receiving groove 111 are spaced apart in the axial direction X. When the metal signal disk 13 rotates, an eddy current signal is generated on the surface of the metal signal disk 13. The signal receiving coil 15 collects the eddy current signal generated on the surface of the metal signal disk 13 and transmits it to the motor controller 20 through the conductive part 12. The chip in the motor controller 20 filters and decodes the signal collected by the signal receiving coil 15. After decoding, a sine signal (Sin signal) and a cosine signal (Cos signal) are extracted. Then, through system calculation, the sine signal and cosine signal are converted into a 360° real-time angle signal of the motor rotor for the motor controller 20 to control the motor.

[0043] By adopting the above technical solution, since no decoding chip and its peripheral circuits are set on the conductive part 12, compared with the solution provided by the prior art, the above technical solution makes full use of the chip in the motor controller 20 to realize the decoding function. The hardware and software in the motor controller 20 drive the operation of the motor rotor position sensor 10. The software only requires a small amount of computing power, which can save the cost of decoding chips and their peripheral load circuits in hardware, resulting in lower cost. Moreover, it does not need to consider the possibility of failure of decoding chips and their peripheral load circuits in complex working environments, thus having higher reliability. For example, when decoding chips and their peripheral circuits are set on the conductive part 12, the operating temperature level of electronic components needs to be considered. For example, it is necessary to ensure that electronic components can work normally in the range of -40℃ to 150℃. This requires enhanced packaging design and other process treatments for the conductive part 12, which greatly increases the cost. Furthermore, there is a risk of failure when the operating temperature exceeds the safe range.

[0044] In some embodiments, see Figure 1b , Figure 2 , Figure 3The conductive part 12 includes a PCB board 121. There is only one PCB board 121 at the motor end. Apart from the signal transmitting coil 14 and the signal receiving coil 15, there are no other electronic components (such as decoding chips and their peripheral circuits) on the PCB board 121. All other electronic components are integrated in the motor controller 20. Compared with the conventional method of mounting other electronic components on the PCB board 121 at the motor end, the other electronic components of the sensor are protected by the mechanical housing of the motor controller 20 and the working environment, which reduces the risk of sensor failure in harsh working environments.

[0045] In some embodiments, see Figure 1b , Figure 2 , Figure 3 The PCB board 121 includes a connection terminal 1212 and a sensing terminal 1211. The sensing terminal 1211 and the connection terminal 1212 are connected. The connection terminal 1212 is used to connect to the motor controller 20. The signal receiving coil 15 and the signal transmitting coil 14 are both disposed on the sensing terminal 1211. Exemplarily, the connection terminal 1212 and the sensing terminal 1211 of the PCB board 121, as well as the signal receiving coil 15 and the signal transmitting coil 14 disposed on the PCB board 121, are all electrically connected through the conductive layer (not shown in the figure) of the PCB board 121.

[0046] In some embodiments, see Figure 1b , Figure 2 , Figure 3 The first housing 11 includes a mounting hole 112 along the circumferential direction R. The sensing end 1211 is disposed around the hole wall 1121 of the mounting hole 112. The mounting hole 112 is for the rotor shaft of the motor to pass through. Along the radial direction Y, the hole wall 1121 of the mounting hole 112 is spaced apart from the rotor shaft of the motor. The first housing 11 does not rotate synchronously with the rotor shaft of the motor. Exemplarily, the hole wall 1121 of the mounting hole 112 protrudes towards the metal signal disk 13 along the axial direction X. The hole wall 1121 of the mounting hole 112 and the groove wall 1111 of the receiving groove 111 together define the receiving groove 111. The PCB board 121, the signal transmitting coil 14, and the signal receiving coil 15 are all disposed between the hole wall 1121 of the mounting hole 112 and the groove wall 1111 of the receiving groove 111.

[0047] For example, the shape of the PCB board 121 is the same as the shape of the receiving groove 111. The connecting end 1212 of the PCB board 121 is rectangular and the sensing end 1211 of the PCB board 121 is circular. It can be understood that the embodiments of this application do not limit the shape of the connecting end 1212 and the sensing end 1211 of the PCB board 121, that is, they do not limit the shape of the PCB board 121 and the receiving groove 111.

[0048] In some embodiments, see Figure 2 , Figure 3 ,Figure 4 and combined Figure 1a The position sensor 10 includes a first connection portion 16, one end of which is connected to a connection terminal 1212, and the other end is used to connect to the motor controller 20. Exemplarily, the first connection portion 16 includes a connecting harness 161 and a connecting terminal 162. Exemplarily, the connecting harness 161 includes a first signal transmission portion 1611 and a second signal transmission portion 1612. One end of the first signal transmission portion 1611 is connected to a signal transmitting coil 14 via the connection terminal 1212, and the other end is used to connect to the output terminal 201 of the controller 20, for transmitting the high-frequency pulse signal output by the motor controller 20 to the signal transmitting coil 14. One end of the second signal transmission portion 1612 is connected to a signal receiving coil 15 via the connection terminal 1212, and the other end is used to connect to the input terminal 202 of the controller 20, for transmitting the eddy current signal received by the signal receiving coil 15 to the motor controller 20. The second signal transmission unit 1612 includes two sine signal transmission lines and two cosine signal transmission lines. The first signal transmission unit 1611 includes two high-frequency signal transmission lines. The sine signal transmission lines and cosine signal transmission lines are connected to the signal receiving coil 15 through the connection terminal 1212 of the PCB board 121. The high-frequency signal transmission lines are connected to the signal transmitting coil 14 through the connection terminal 1212 of the PCB board 121.

[0049] In some embodiments, the conductive portion 12 includes at least six solder joints 122, the six solder joints 122 being radially (perpendicular to) Figure 3 The connecting ends 1212 of the PCB board 121 (in the radial direction of Y) are spaced apart and are used to solder to the 6 transmission lines respectively. For example, the first connecting part 16 includes a connecting terminal 162, and the other end of the connecting wire harness 161 is connected to the motor controller 20 through the connecting terminal 162.

[0050] In some embodiments, see Figure 2 , Figure 3 , Figure 4 The first housing 11 includes a second connecting portion 113, which is disposed on the outer side of the groove wall 1111 of the receiving groove 111 for connection with the second housing of the motor. Exemplarily, the first housing 11 includes three second connecting portions 113, each including a connecting hole 1131. The three connecting holes 1131 are spaced apart circumferentially R on the outer side of the groove wall 1111 of the receiving groove 111. The outer side of the groove wall 1111 refers to the side of the groove wall 1111 facing away from the mounting hole 112 along the radial direction Y. This application embodiment does not limit the number of second connecting portions 113; for example, it can be one, two, four, five, six, etc.

[0051] In some embodiments, see Figure 2 ,Figure 3 , Figure 4 The first housing 11 includes a fixing part 114, which is spaced apart from the second connecting part 113 on the outside of the groove wall 1111 of the receiving groove 111. One end of the connecting wire harness 161 passes through the fixing part 114 and is connected to the connecting end 1212.

[0052] In some embodiments, see Figure 4 and combined Figure 2 , Figure 3 The fixing part 114 includes a first part 1141 and a second part 1142. Along the radial direction Y, the first part 1141 protrudes from the outer side of the groove wall 1111 of the receiving groove 111, and the second part 1142 is fitted onto the first part 1141. The second part 1142 and the first part 1141 together form a limiting space 1140. One end of the connecting wire harness 161 passes through the limiting space and connects to the connecting end 1212. Exemplarily, the fixing part 114 also includes a third part 1143, which is fitted onto the second part 1142 and abuts against the connecting wire harness 161 in the radial direction Y, making the connection of the connecting wire harness 161 more secure.

[0053] For example, the fixing part 114 is a hollow cuboid shape along the axial direction X. The second part 1142 includes a top 11421 and a bottom 11422. The bottom 11422 is connected to the first part 1141. The top 11421 and the first part 1141 are spaced apart along the axial direction X. A side part 11423 is also provided between the top 11421 and the bottom wall. The third part 1143 is provided on the side part 11423 to further reduce the limiting space in the radial direction Y.

[0054] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A position sensor, characterized by The position sensor comprises: a metal signal disc for connecting with a rotor shaft of a motor; a first housing, which is provided with a receiving groove on a side facing the metal signal disc in an axial direction; a signal receiving coil arranged in the receiving groove for receiving an eddy current signal generated by the metal signal disc; a signal transmitting coil arranged in the receiving groove in a circumferential direction and surrounding the signal receiving coil, for receiving a pulse signal output by a controller of the motor; a conductive part for connecting with the controller of the motor, which is arranged in the receiving groove in the axial direction, and the signal receiving coil and the signal transmitting coil are arranged on a side of the conductive part facing the metal signal disc, and the signal receiving coil and the signal transmitting coil are connected with the conductive part, and the conductive part is not provided with a decoding chip and a peripheral load circuit thereof.

2. The position sensor of claim 1, wherein, The conductive part comprises a connecting end and a sensing end, the sensing end is connected with the connecting end, the connecting end is used for connecting with the controller of the motor, and the signal receiving coil and the signal transmitting coil are arranged in the sensing end.

3. The position sensor of claim 2, wherein, The first housing comprises a mounting hole in the circumferential direction, the sensing end is arranged around a hole wall of the mounting hole, the mounting hole is used for allowing the rotor shaft of the motor to pass through in a radial direction, the hole wall of the mounting hole is spaced apart from the rotor shaft of the motor in the radial direction, and the first housing does not rotate synchronously with the rotor shaft of the motor.

4. The position sensor of claim 2, wherein, The conductive part comprises a first signal transmission part and a second signal transmission part, one end of the first signal transmission part is connected with the signal transmitting coil through the connecting end, and the other end is used for connecting with an output end of the controller, and one end of the second signal transmission part is connected with the signal receiving coil through the connecting end, and the other end is used for connecting with an input end of the controller.

5. The position sensor of claim 4, wherein, The conductive part comprises a PCB board, and the first signal transmission part and the second signal transmission part each comprise a connecting wire harness.

6. The position sensor of claim 5, wherein, The first housing comprises a second connecting part arranged outside a groove wall of the receiving groove and used for connecting with a second housing of the motor.

7. The position sensor of claim 6, wherein, The first housing comprises a fixing part arranged outside the groove wall of the receiving groove and spaced apart from the second connecting part, and one end of the connecting wire harness passes through the fixing part and is connected with the connecting end.

8. The position sensor of claim 7, wherein, The fixing part comprises a first part and a second part, the first part is protruded outside the groove wall of the receiving groove in the radial direction, the second part is sleeved on the first part, and the second part and the first part jointly enclose a limiting space, and one end of the connecting wire harness passes through the limiting space and is connected with the connecting end.

9. An electric machine characterized by The motor comprises:

10. The electric machine of claim 9, wherein, a second housing connected with the first housing of the position sensor, and a rotor shaft is arranged in the second housing and connected with the metal signal disc. ​ A controller is used for filtering and decoding the eddy current signal and outputting a pulse signal, the controller is connected with the conductive part, the controller includes an output end and an input end, the output end is connected with the other end of the first signal transmission part of the position sensor, used for outputting a pulse signal to the signal transmitting coil, and the input end is connected with the other end of the second signal transmission part of the position sensor, used for receiving the eddy current signal collected by the signal receiving coil.

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