CN117978023A - Inductive position sensor chip, inductive position sensor, motor and vehicle - Google Patents
Inductive position sensor chip, inductive position sensor, motor and vehicle Download PDFInfo
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Abstract
The application provides an inductive position sensor chip, an inductive position sensor, a motor and a vehicle. An inductive position sensor chip comprising: the input end of the decoding circuit is electrically connected with the receiving coil of the induction type position sensor, and the decoding circuit is used for: decoding a voltage signal generated by the receiving coil due to the rotation of the motor rotor to obtain a differential analog signal; the angle calculation circuit, the input is connected with the output electricity of decoding circuit, and the output is connected with the electric controller of motor rotor, and angle calculation circuit is used for: converting the differential analog signal into a first angle signal of the motor rotor and transmitting the first angle signal to the controller. The inductive position sensor chip can directly send the angle signal of the motor rotor to the controller, and has low requirements on the controller of the motor rotor and a detection circuit between the inductive position sensor and the controller, so that the application range of the inductive position sensor chip can be improved.
Description
Technical Field
The application relates to the technical field of sensors, in particular to an induction type position sensor chip, an induction type position sensor, a motor and a vehicle.
Background
In the field of automated driving, it is necessary to know the rotor position of the motor to achieve control of the motor and therefore, a rotor position sensor of the motor is an essential part of motor control.
Currently, resolver (Resolver) sensors are commonly used to determine the rotor position of the motor. However, in this solution, as shown in fig. 1, the controller used with the resolution sensor and the detection circuit between them are complex, and a micro control unit (Microcontroller Unit; MCU), an amplifying circuit and an RC filter (filter) circuit with a decoder and sinusoidal pulse width modulation (Sinusoidal Pulse Width Modulation, SPWM) generator are required. Therefore, the scheme has higher requirements on the controller and the detection circuit, so that the application range of the scheme is smaller.
Disclosure of Invention
The embodiment of the application provides an induction type position sensor chip, an induction type position sensor, a motor and a vehicle, which can solve the problem that the application range of the position sensor is smaller due to the fact that the existing position sensor has high requirements on a controller and a detection circuit.
To solve the above problems, the present application is achieved as follows:
in a first aspect, an embodiment of the present application provides an inductive position sensor chip, including:
The input end of the decoding circuit is electrically connected with the receiving coil of the induction type position sensor, and the decoding circuit is used for: decoding a voltage signal generated by the receiving coil due to the rotation of the motor rotor to obtain a differential analog signal;
the input end of the angle calculating circuit is electrically connected with the output end of the decoding circuit, the output end of the angle calculating circuit is electrically connected with the controller of the motor rotor, and the angle calculating circuit is used for: converting the differential analog signal into a first angle signal of the motor rotor, and sending the first angle signal to the controller so that the controller controls the working state of the motor rotor based on the first angle signal.
In a second aspect, an embodiment of the present application further provides an inductive position sensor, including:
the inductive position sensor chip of the first aspect;
the transmitting coil is electrically connected with the induction type position sensor chip and is used for transmitting an oscillation signal;
And the receiving coil is electrically connected with the induction type position sensor chip and is used for generating a voltage signal.
In a third aspect, an embodiment of the present application further provides a controller, where the controller is electrically connected to the inductive position sensor and the motor rotor according to the second aspect, respectively; the controller is used for: receiving a first angle signal output by the inductive position sensor; and controlling the working state of the motor rotor based on the first angle signal.
In a fourth aspect, an embodiment of the present application further provides an electric machine, including:
the inductive position sensor of the second aspect;
A motor rotor;
the controller according to the third aspect;
Wherein the controller is electrically connected with the motor rotor and the inductive position sensor.
In a fifth aspect, embodiments of the present application also provide a vehicle, the vehicle including an inductive position sensor chip as described in the first aspect; or an inductive position sensor as described in the second aspect; or a controller as described in the third aspect; or an electric machine as described in the third aspect.
The embodiment of the application has at least the following beneficial effects: in the embodiment of the application, the inductive position sensor chip is provided with the decoding circuit and the angle calculating circuit, so that the inductive position sensor chip can decode a voltage signal generated by a receiving coil of the inductive position sensor through the decoding circuit to obtain a differential analog signal; the differential analog signal may be converted into an angle signal of the motor rotor by an angle calculation circuit. Therefore, the inductive position sensor chip can directly send an angle signal of the motor rotor to the controller, so that the controller obtains the position of the motor rotor, and further control of the motor rotor is realized. Therefore, according to the inductive position sensor chip provided by the embodiment of the application, a decoding chip is not required to be arranged on the controller, and an amplifying circuit and a filtering circuit are not required to be arranged on a detection circuit between the controller and the inductive position sensor chip, namely, the inductive position sensor chip provided by the embodiment of the application has low requirements on the controller and the detection circuit, so that the application range of the inductive position sensor chip can be improved.
Drawings
FIG. 1 is a prior art motor rotor control architecture;
FIG. 2 is a schematic diagram of a motor rotor control architecture according to an embodiment of the present application;
FIG. 3 is a second schematic diagram of a motor rotor control architecture according to an embodiment of the present application;
FIG. 4 is a third schematic diagram of a motor rotor control architecture according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a motor rotor control architecture according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a motor rotor control architecture according to an embodiment of the present application;
fig. 7 is a schematic diagram of a motor rotor control architecture according to an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a further description of the application will be made. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the application.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The following provides a detailed description of embodiments of the present application through some embodiments and application scenarios thereof with reference to the accompanying drawings.
Considering that the inductive position sensor (iRPS) has the advantages of high temperature resistance, no electromagnetic interference, functional safety, large rotating speed range and the like, the embodiment of the application realizes the position detection of the motor rotor through the inductive position sensor,
It is understood that the inductive position sensor chip is a chip of an inductive position sensor. To achieve position detection of the motor rotor, as shown in fig. 2, the inductive position sensor includes, in addition to the inductive position sensor chip 11: a transmitting coil 12, a receiving coil 13, and a metal conductor 14, the metal conductor 14 being disposed above the transmitting coil 12 and the receiving coil 13. The inductive position sensor is based on the principle of eddy currents, whereby the position detection of the motor rotor is achieved by moving a metal conductor 14 over a transmitting coil 12 and a receiving coil 13.
In particular, the rotation of the metallic conductor 14 is rigidly coupled to the rotation of the motor rotor, i.e., the rotation of the metallic conductor 14 is consistent with the rotation of the motor rotor. The transmitting coil 12 is used for transmitting an oscillating signal, the receiving coil 13 generates a voltage signal (i.e. induced electromotive force) due to the high-frequency oscillating magnetic field, and the metal conductor 14 rotating above the transmitting coil 12 also generates an exciting magnetic field for inducing eddy currents to weaken the transmitting coil, so that the voltage signal of the receiving coil 13 below the metal conductor 14 varies with the area of the receiving coil 13 covered by the metal conductor 14. In this way, the position of the motor rotor can be determined by receiving the voltage signal generated by the coil 13.
In practical applications, the inductive position sensor may include a transmitting coil 12 and two receiving coils 13, where the two receiving coils 13 are routed as sinusoids with a phase difference of 90 °. The transmitting coil 12 and the receiving coil 13 may be printed on a printed circuit board (Printed Circuit Board, PCB), and further, the transmitting coil 12 and the receiving coil 13 may be printed on the PCB in the form of copper tracks. Further, the transmitting coil 12 and the receiving coil 13 and the inductive position sensor chip 11 may be printed on the same PCB.
The metal conductors 14 may be made of any type of metal, such as aluminum, steel, or copper PCB. For a brushless dc motor or a permanent magnet synchronous motor, the number of metal conductors 14 is determined by the pole pair number of the motor rotor, and is evenly distributed over the transmitting coil 12 and the receiving coil 13.
It should be noted that, the inductive position sensor chip 11 and other components of the inductive position sensor may be supplied by the same manufacturer, or may be supplied by different manufacturers, and may be specifically determined according to actual requirements, which is not limited in the embodiment of the present application.
As shown in fig. 1, in the embodiment of the present application, the inductive position sensor chip 11 includes a decoding circuit 111 and an angle calculating circuit 112.
The input end of the decoding circuit 111 is electrically connected to the receiving coil 13, and the output end of the decoding circuit 111 is electrically connected to the angle calculating circuit 112. In particular, the decoding circuit 111 receives the voltage signal generated by the receiving coil 13. And performing decoding operation on the received voltage signal to obtain a differential analog signal. Then, the decoded differential analog signal is output to the angle calculation circuit 112.
The decoding operations may include amplifying, shaping, filtering, etc. The differential analog signals include sine differential analog signals (including sin+ and SIN-two sine signals) and cosine differential analog signals (including cos+ and COS-two cosine signals).
An input end of the angle calculation circuit 112 is electrically connected to an output end of the decoding circuit 111, and an output end of the angle calculation circuit 112 is electrically connected to the motor rotor controller 20. In particular, the angle calculation circuit 112 receives the differential analog signal output from the decoding circuit 111. And performing angle calculation operation on the received differential analog signals to obtain first angle signals, namely the rotating position of the motor rotor. Thereafter, the calculated angle signal is output to the controller 20 to cause the controller 20 to perform a control operation of the motor rotor based on the first angle signal.
The angle calculation operation may include: the difference vsin= | (sin+) - (SIN-) | of the sine differential analog signal is calculated, and the difference Vcos = | (cos+) - (COS-) | of the cosine differential analog signal is calculated, and the angle signal=arctan (Vsin/Vcos).
The control operation may include: the rotational position, rotational speed, rotational direction, and the like of the motor rotor are adjusted. In particular, when the controller 20 may store in advance the corresponding relation between the preset angle signal and the rotation position, the rotation speed and the rotation direction of the motor rotor, so that the controller 20 may adjust the rotation position, the rotation speed and the rotation direction of the motor rotor to the values corresponding to the first angle signal through the corresponding relation when receiving the first angle signal, thereby realizing accurate control of the motor rotor.
The angle calculation circuit 112 may send an angle signal to the controller 20 via a two-wire serial bus (Inter-INTEGRATED CIRCUIT, I2C) or a serial peripheral interface (SERIAL PERIPHERAL INTERFACE, SPI).
The induction type position sensor chip can directly send the angle signal of the motor rotor to the controller, a decoding chip is not required to be arranged on the controller through the induction type position sensor chip, and an amplifying circuit and a filter circuit are not required to be arranged on a detection circuit between the controller and the induction type position sensor chip, namely, the induction type position sensor chip of the embodiment of the application has low requirements on the controller and the detection circuit, so that the application range of the induction type position sensor chip can be improved.
In some embodiments of the present application, an output of the decoding circuit may be further electrically connected to the controller;
Wherein the decoding circuit is further configured to: and sending a differential analog signal to the controller so that the controller converts the differential analog signal into a second angle signal of the motor rotor, and checking the first angle signal by using the second angle signal.
For ease of understanding, please refer to fig. 3. In fig. 3, the decoding circuit 111 includes two output terminals, denoted as a first output terminal and a second output terminal, wherein the first output terminal is electrically connected to the angle calculating circuit 112; the second output is electrically connected to the controller 20. The decoding circuit 111 outputs a differential analog signal to the angle calculation circuit 112 through a first output terminal so that the angle calculation circuit 112 transmits a first angle signal to the controller 20; the decoding circuit 111 outputs a differential analog signal to the controller 20 through a second output terminal. It can be seen that in the present embodiment, the inductive position sensor chip 11 has at least two output modes: a differential analog signal output mode and a digital output mode.
In the digital output mode, the angle signal calculated by the angle calculating circuit 112 is transmitted to the controller 20, and the controller 20 controls the motor rotor based on the first angle signal.
The differential analog signal output mode transmits the differential analog signal decoded by the decoding circuit 111 to the controller 20. After receiving the differential analog signal, the controller 20 may perform the following operations:
Converting the differential analog signal into a second angle signal of the motor rotor;
checking the first angle signal by using the second angle signal to obtain a checking result;
And controlling the working states of the induction type position sensor and the motor rotor by using the verification result.
In particular, when the difference between the first angle signal and the second angle signal is smaller than the first threshold, the verification result may be that the verification is passed, in which case, indicating that the inductive position sensor chip 11 is reliable, the controller 20 may continue to inductively supply power to the inductive position sensor, and control the working state of the motor rotor, such as the rotation angle, the rotation direction, the rotation speed, and the like, based on the first angle signal. The first threshold may be set based on actual requirements, e.g., the first threshold may be 5 degrees.
In the case that the difference between the first angle signal and the second angle signal is greater than or equal to the first threshold, the verification result may be that the verification is failed, in this case, indicating that the inductive position sensor chip 11 is unreliable, the controller 20 may stop supplying power to the inductive position sensor in an inductive manner, stop the operation of the inductive position sensor, and control the motor rotor to stop the operation of the inductive position sensor.
Through the embodiment, the decoding circuit 111 can directly output a differential analog signal to the controller 20, so that the controller can calculate a second angle signal by using the differential analog signal, and can check or monitor the first angle signal by using the second angle signal, and can control the inductive position sensor and the motor rotor to stop working under the condition that the difference value of the two angle signals is greater than or equal to the first threshold value, thereby improving the working safety of the motor.
In other embodiments of the present application, the inductive position sensor chip may further include a signal processing circuit, an input terminal of the signal processing circuit being electrically connected to an output terminal of the decoding circuit, and an output terminal of the signal processing circuit being electrically connected to the controller;
Wherein the signal processing circuit is configured to: converting the differential analog signal into a digital increment signal, and transmitting the digital increment signal to the controller, so that the controller converts the digital increment signal into a third angle signal of the motor rotor, and verifies the first angle signal by using the third angle signal.
The main difference between this embodiment and the embodiment of fig. 3 is that: in the embodiment of fig. 3, the inductive position sensor chip outputs a differential analog signal and a first angle signal to the controller; in the present embodiment, the sensor chip 11 outputs a digital increment signal and a first angle signal to the controller, wherein the digital increment signal is processed by the signal processing circuit of the sensor chip 11.
The input end of the signal processing circuit is electrically connected with the decoding circuit, and the output end of the signal processing circuit is electrically connected with the controller. The signal processing circuit has the functions of: the differential analog signal is converted into a digital delta signal. In particular, the signal processing circuit may compare the differential analog signal with a preset bias voltage, convert the analog signal greater than or equal to the bias voltage to a high level, and convert the analog signal less than the bias voltage to a low level, thereby obtaining a digital increment signal.
In this embodiment, after the controller receives the digital increment signal, the processing of the digital increment signal is similar to the processing of the differential analog signal in the embodiment of fig. 3, specifically:
Converting the digital delta signal into a third angle signal of the motor rotor;
checking the first angle signal by using the third angle signal to obtain a checking result;
And controlling the working states of the induction type position sensor and the motor rotor by using the verification result.
Through the present embodiment, the decoding circuit 111 can directly output a digital increment signal to the controller 20, so that the controller can calculate a third angle signal by using the digital increment signal, and can check or monitor the first angle signal by using the third angle signal, and can control the inductive position sensor and the motor rotor to stop working under the condition that the difference value between the two angle signals is greater than or equal to the first threshold value, thereby improving the working safety of the motor. In addition, compared with the embodiment of the method in fig. 2, since the inductive position sensor chip transmits the digital increment signal processed by the signal processing circuit, the signal transmission amount can be reduced, so that the signal transmission efficiency can be improved, and the motor control efficiency can be further improved.
In some embodiments of the present application, as shown in fig. 4, the inductive position sensor chip 11 may further include an oscillation driving circuit 113, an output terminal of the oscillation driving circuit 113 is electrically connected to the transmitting coil 12 of the inductive position sensor, and the oscillation driving circuit 113 is configured to: the oscillation signal is output to the transmitting coil 12.
Further, the oscillation driving circuit 113 may be configured to output an oscillation signal having a frequency of 2 megahertz (MHz) to 5MHz to the transmitting coil 12. By controlling the frequency of the oscillation signal output by the oscillation driving circuit 113 to be 2 to 5MHz, the rotation frequency of the oscillation signal and the rotation frequency of the motor rotor are not interfered with each other, and a shielding layer is not required to be added, so that the cost can be reduced.
In some alternative implementations, the oscillating drive circuit 113 may be an RC oscillating drive circuit.
In other alternative implementations, the oscillation driving circuit 113 may include an oscillator (oscillator) and a capacitor connected in parallel, where the frequency of the oscillation signal output by the oscillation driving circuit 113 is implemented by configuring a capacitance value of the capacitor. In this way, the configuration of the frequency of the oscillation signal output by the oscillation driving circuit 113 can be realized by configuring the capacitance value of the capacitor, and no additional excitation amplifying circuit is required, so that the cost can be reduced.
In some embodiments of the present application, as shown in fig. 5, the inductive position sensor chip 11 may further include a diagnosis control circuit 114, the diagnosis control circuit 114 being electrically connected to the oscillation driving circuit 113 and the decoding circuit 111, the diagnosis control circuit 114 being configured to: the differential analog signal is diagnosed to obtain a first diagnosis signal, and the operation state of the oscillation driving circuit 113 is controlled based on the first diagnosis signal.
In particular, the differential analog signal output by the decoding circuit 111 may be compared with a differential analog signal determined in advance based on the oscillation signal, to obtain the first diagnostic signal.
In the case that the difference value between the two is greater than or equal to the second threshold value, the first diagnostic signal may indicate that the diagnosis is abnormal, the inductive position sensor may be shorted, and in order to improve the working safety of the motor, the diagnostic control circuit 114 may control the oscillation driving circuit 113 to stop working. In the case that the difference value between the first and second signals is smaller than the second threshold value, the first diagnostic signal may indicate that the diagnosis is normal, and the diagnostic control circuit 114 may continuously control the oscillation driving circuit 113 to operate normally.
For both cases, the manifestation of the first diagnostic signal may be different due to the different diagnostic results indicated by the first diagnostic signal. In an alternative implementation, the first diagnostic signal may indicate different diagnostic results by a high-low level signal. As one example, in the case where the difference between the two is greater than or equal to the second threshold value, the first diagnostic signal may be high level, by which the diagnostic abnormality is indicated; in the case where the difference between the two is smaller than the second threshold value, the first diagnosis signal may be low level, indicating that diagnosis is normal by the low level.
In this way, the diagnosis control circuit 114 can diagnose the differential analog signal outputted from the decoding circuit 111, and realize short-circuit protection, thereby improving the operation safety of the motor.
In fig. 5, the diagnostic control circuit 114 and the angle calculation circuit 112 are provided independently, and in other embodiments, as shown in fig. 6, the diagnostic control and the angle calculation may be integrated in one circuit.
In some embodiments of the present application, as shown in fig. 5, the inductive position sensor chip 11 may further include a power management circuit 115, an input terminal of the power management circuit 115 is electrically connected to the controller 20, an output terminal of the power management circuit 115 is electrically connected to the diagnostic control circuit 114, and the power management circuit 115 is configured to: supplying power to the inductive position sensor chip 11;
Wherein the diagnostic control circuit 114 is further configured to: the output voltage of the power management circuit 115 is diagnosed to obtain a second diagnosis signal, and the second diagnosis signal is sent to the controller, so that the controller controls the operation state of the power management circuit 115 based on the second diagnosis signal.
In this embodiment, the inductive position sensor chip 11 is powered by the controller 20 through the power management circuit 115. It will be appreciated that, in other implementations, the inductive position sensor chip 11 may also obtain power in other manners, and may be specifically determined according to actual requirements, which is not limited by the embodiment of the present application.
In this embodiment, the diagnostic control circuit 114 may further compare the output voltage of the power management circuit 115 with a preset voltage range to obtain a second diagnostic signal.
In the case where the output voltage is less than the minimum value of the preset voltage range, indicating that the output voltage is under-voltage, the second diagnostic signal may indicate a diagnostic abnormality, or that the output voltage is under-voltage. After the controller acquires the second diagnostic signal, the controller may increase the output voltage of the power management circuit 115 to be within a preset voltage range.
In the case where the output voltage is greater than or equal to the maximum value of the preset voltage range, indicating that the output voltage is over-voltage, the second diagnostic signal may indicate that the diagnosis is abnormal, or that the output voltage is over-voltage. After the controller acquires the second diagnostic signal, the controller may reduce the output voltage of the power management circuit 115 to be within a preset voltage range.
In the case where the output voltage is within the preset voltage range, indicating that the output voltage is normal, the second diagnostic signal may indicate that the diagnosis is normal. The controller may not adjust the output voltage of the power management circuit 115 after the second diagnostic signal is obtained.
For the above three cases, the expression form of the second diagnostic signal may be different because the diagnostic result indicated by the second diagnostic signal is different. In an alternative implementation, the first diagnostic signal may indicate a different diagnostic result by a level signal. As one example, in the case where the output voltage is less than the minimum value of the preset voltage range, the second diagnostic signal may be a first level by which a diagnostic abnormality caused by the output voltage under-voltage is indicated; in the case that the output voltage is greater than or equal to the maximum value of the preset voltage range, the second diagnosis signal may be a second level, and diagnosis abnormality caused by overvoltage of the output voltage is indicated through the second level; in case the output voltage is within the preset voltage range, the second diagnostic signal may be a third level, by which the diagnosis is indicated as normal.
Thus, the diagnosis control circuit 114 can diagnose the output voltage of the power management circuit 115, and realize undervoltage and overvoltage protection, thereby improving the working safety of the motor.
The embodiment of the application also provides an induction type position sensor, which comprises:
the embodiment of the application provides an induction type position sensor chip;
the transmitting coil is electrically connected with the induction type position sensor chip and is used for transmitting an oscillation signal;
And the receiving coil is electrically connected with the induction type position sensor chip and is used for generating a voltage signal.
Because the inductive position sensor includes the inductive position sensor chip provided by the embodiment of the application, it can be understood that the inductive position sensor can achieve the beneficial effects of the inductive position sensor chip, and in order to avoid repetition, the description is omitted here.
The embodiment of the application also provides a controller which is respectively and electrically connected with the induction type position sensor and the motor rotor provided by the embodiment of the application; the controller is used for: receiving a first angle signal output by the inductive position sensor; and controlling the working state of the motor rotor based on the first angle signal. Therefore, the controller of the embodiment of the application can directly control the working state of the motor rotor based on the angle signal output by the inductive position sensor, does not need to perform angle calculation, and can improve the control efficiency of the motor rotor.
In some embodiments, the controller is further to:
Converting a target signal output by the induction type position sensor into a target angle signal of the motor rotor, wherein the target angle signal is a second angle signal when the target signal is a differential analog signal, and is a third angle signal when the target signal is a digital increment signal;
Checking the first angle signal by using the target angle signal to obtain a checking result;
And controlling the working states of the induction type position sensor and the motor rotor by using the verification result.
Therefore, the controller can calculate the second angle signal by utilizing the differential analog signal, check or monitor the first angle signal by utilizing the second angle signal, and control the induction type position sensor and the motor rotor to stop working under the condition that the difference value of the second angle signal and the first angle signal is larger than or equal to a first threshold value, so that the working safety of the motor can be improved.
In some embodiments, the controller is further to: and controlling the working state of the inductive position sensor based on the second diagnosis signal output by the inductive position sensor.
Therefore, the output voltage of the power management circuit of the inductive position sensor can be in a preset voltage range, and the working reliability and safety of the inductive position sensor can be improved.
The embodiment of the application also provides a motor, which comprises:
the embodiment of the application provides an inductive position sensor;
A motor rotor;
the embodiment of the application provides a controller;
Wherein the controller is electrically connected with the motor rotor and the inductive position sensor.
Because the motor comprises the induction type position sensor provided by the embodiment of the application, a decoding chip is not required to be arranged on a controller of the motor, and an amplifying circuit and a filtering circuit are not required to be arranged on a detection circuit between the controller and the induction type position sensor chip, so that the cost of the motor can be reduced.
The embodiment of the application also provides a vehicle, which comprises the induction type position sensor chip provided by the embodiment of the application; or the induction type position sensor provided by the embodiment of the application; or the controller provided by the embodiment of the application; or the motor provided by the embodiment of the application.
Because the vehicle comprises the induction type position sensor chip provided by the embodiment of the application; or the induction type position sensor provided by the embodiment of the application; or the motor provided by the embodiment of the application can be understood that the vehicle can reach the induction type position sensor chip; or an inductive position sensor; or the beneficial effects of the motor, which are not repeated here.
It should be noted that, the various optional implementations described in the embodiments of the present application may be implemented in combination with each other without collision, or may be implemented separately, which is not limited to the embodiments of the present application.
In the embodiment of the application, the following steps are included:
1) The position detection of the motor rotor is realized based on the induction type position sensor, the high temperature resistance, the electromagnetic interference avoidance and the high rotating speed range are realized, and the functional safety is met;
2) The angle signal obtained by decoding and calculation is directly transmitted to the MCU of the controller based on the induction type position chip, and meanwhile, the demodulated analog signal is fed back to the AD port of the MCU for the angle input of torque monitoring with safe functions, so that the hardware circuit cost and MCU resources controlled by a motor are reduced, and more MCUs are adapted;
3) The output port of the inductive position sensor is expanded to have an analog interface and a digital port, the integration level is high, a matched peripheral detection circuit is simple, the current consumption is low, and the current consumption is less than 20 milliamperes (mA).
As shown in fig. 6, the inductive position sensor iRPS is based on the principle of eddy currents, with position detection being achieved by moving a metal conductor over the transmitting and receiving coils. The transmitting coil and the two receiving coils are printed on the PCB board in the form of copper wires, the two receiving coils are sinusoidal with 90-degree phase difference, the metal conductors can be made of any type of metal, such as aluminum, steel or PCB copper plates, in the rotor position detection of the brushless direct current or permanent magnet synchronous motor, the number of the metal conductors is determined by the number of pole pairs of the rotor, and the metal conductors are uniformly distributed above the coils.
The inductive position sensor chip outputs an oscillating signal with the frequency of 2-5 MHz to the transmitting coil through the LC oscillating driving circuit, the receiving coil generates induced electromotive force due to the high-frequency oscillating magnetic field, the metal conductor moving above the coil also generates induced eddy current to weaken the exciting magnetic field of the transmitting coil, and the induced electromotive force of the receiving coil below the metal conductor also changes along with the area of the receiving coil covered by the metal conductor. The induction type position sensor chip demodulates and processes the voltage signal of the receiving coil, calculates the angle, directly sends the decoded angle and rotation speed information to the MCU through the I2C or SPI, and simultaneously sends the demodulated sine and cosine original analog data or digital increment signals to the MCU, and realizes the angle signal input of torque monitoring through the MCU for functional safety. The inductive position sensor chip can realize short circuit, overvoltage and back pressure protection, and faults diagnosed by the I2C or SPI transmission chip and configuration programming of the chip on functions such as decoding and diagnosis.
As shown in fig. 7, the configuration of the oscillation frequency of the transmitting coil can be realized by configuring the capacitance of the LC oscillator port of the inductive position sensor chip, and the configurable range is 2 to 5MHz, so that the shielding layer is not required to be added, thereby reducing the cost. The sensor chip performs custom expansion based on the application, and configures a plurality of output modes: differential analog signal output mode and SPI digital output mode:
the differential analog signal output mode outputs sine and cosine analog differential signals, and the mode has better signal integrity and EMC performance, but occupies AD resources of an MCU, and meanwhile, software is required to process the acquired signals to obtain the rotation position, direction and speed, such as position=arctan (Vsin/Vcos).
And in the SPI digital output mode, the decoded angle signal is directly transmitted to the MCU through the SPI, the signal is input for torque calculation, filtering and signal diagnosis are performed in the MCU, and the requirement and the load rate of the MCU are reduced.
Embodiments of the present application may include the following:
the configuration of the oscillation frequency of the transmitting coil is realized by configuring the capacitance of the LC oscillator port of the inductive position sensor chip, and an additional excitation amplifying circuit is not needed;
Demodulating and angle calculating voltage signals of the receiving coil through the induction type position sensor chip, directly feeding back angle information to the MCU through the SPI, and sending demodulated sine and cosine original analog data to the MCU for angle calculation, so that the function is safe, and an additional decoding chip or MCU soft decoding is not needed to be added;
the induction type position sensor chip compares the demodulated sine and cosine signals in the chip with the bias voltage and outputs high and low level digital signals to the MCU, so that the detection of the position, the direction and the speed of the rotor is realized;
the inductive position sensor chip is used for realizing the protection of sine and cosine output signals, namely short circuit, overvoltage and back pressure, and the I2C or SPI is used for realizing fault diagnosis and configuration programming of functions such as decoding and diagnosis.
The embodiment of the application has the following beneficial effects:
Based on the induction type position sensor iRPS, the electromagnetic induction type position sensor is high-temperature resistant, free of electromagnetic interference, safe in function and large in rotating speed range;
Based on direct decoding of the digital signals, the cost and MCU resources controlled by the motor are reduced, and more MCUs are adapted;
The detection circuit is simple, low in cost and high in reliability.
In the foregoing, only the specific embodiments of the present application are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present application is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present application, and they should be included in the scope of the present application.
Claims (13)
1. An inductive position sensor chip, comprising:
The input end of the decoding circuit is electrically connected with the receiving coil of the induction type position sensor, and the decoding circuit is used for: decoding a voltage signal generated by the receiving coil due to the rotation of the motor rotor to obtain a differential analog signal;
the input end of the angle calculating circuit is electrically connected with the output end of the decoding circuit, the output end of the angle calculating circuit is electrically connected with the controller of the motor rotor, and the angle calculating circuit is used for: converting the differential analog signal into a first angle signal of the motor rotor, and sending the first angle signal to the controller so that the controller controls the working state of the motor rotor based on the first angle signal.
2. The inductive position sensor chip of claim 1, wherein an output of said decoding circuit is further electrically connected to said controller;
Wherein the decoding circuit is further configured to: and sending a differential analog signal to the controller so that the controller converts the differential analog signal into a second angle signal of the motor rotor, and checking the first angle signal by using the second angle signal.
3. The inductive position sensor chip of claim 1, further comprising a signal processing circuit, an input of the signal processing circuit being electrically connected to an output of the decoding circuit, an output of the signal processing circuit being electrically connected to the controller;
Wherein the signal processing circuit is configured to: converting the differential analog signal into a digital increment signal, and transmitting the digital increment signal to the controller, so that the controller converts the digital increment signal into a third angle signal of the motor rotor, and verifies the first angle signal by using the third angle signal.
4. The inductive position sensor chip of claim 1, further comprising an oscillating drive circuit, an output of the oscillating drive circuit being electrically connected to the transmitting coil of the inductive position sensor, the oscillating drive circuit being configured to: and outputting an oscillating signal to the transmitting coil.
5. The inductive position sensor chip of claim 4, wherein said oscillating drive circuit comprises an oscillator and a capacitor connected in parallel, wherein the frequency of said oscillating signal is achieved by configuring the capacitance value of said capacitor.
6. The inductive position sensor chip of claim 4, further comprising a diagnostic control circuit electrically connected to said oscillating drive circuit and said decoding circuit, said diagnostic control circuit configured to: and diagnosing the differential analog signals to obtain first diagnosis signals, and controlling the working state of the oscillation driving circuit based on the first diagnosis signals.
7. The inductive position sensor chip of claim 6, further comprising a power management circuit having an input electrically coupled to said controller and an output electrically coupled to said diagnostic control circuit, said power management circuit configured to: supplying power to the inductive position sensor chip;
wherein the diagnostic control circuit is further configured to: and diagnosing the output voltage of the power management circuit to obtain a second diagnosis signal, and sending the second diagnosis signal to the controller so that the controller controls the working state of the power management circuit based on the second diagnosis signal.
8. An inductive position sensor, comprising:
The inductive position sensor chip of any one of claims 1 to 7;
the transmitting coil is electrically connected with the induction type position sensor chip and is used for transmitting an oscillation signal;
And the receiving coil is electrically connected with the induction type position sensor chip and is used for generating a voltage signal.
9. A controller electrically connected to the inductive position sensor and the motor rotor of claim 8, respectively; the controller is used for: receiving a first angle signal output by the inductive position sensor; and controlling the working state of the motor rotor based on the first angle signal.
10. The controller of claim 9, wherein the controller is further configured to:
Converting a target signal output by the induction type position sensor into a target angle signal of the motor rotor, wherein the target angle signal is a second angle signal when the target signal is a differential analog signal, and is a third angle signal when the target signal is a digital increment signal;
Checking the first angle signal by using the target angle signal to obtain a checking result;
And controlling the working states of the induction type position sensor and the motor rotor by using the verification result.
11. The controller of claim 9, wherein the controller is further configured to: and controlling the working state of the inductive position sensor based on the second diagnosis signal output by the inductive position sensor.
12. An electric machine, comprising:
the inductive position sensor of claim 8;
A motor rotor;
The controller of any one of claims 9 to 11;
the controller is electrically connected with the motor rotor and the induction type position sensor respectively.
13. A vehicle, characterized in that it comprises an inductive position sensor chip according to any one of claims 1 to 7; or an inductive position sensor as claimed in claim 8; or a controller as claimed in any one of claims 9 to 11; or an electric machine as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315499.6A CN117978023A (en) | 2022-10-26 | 2022-10-26 | Inductive position sensor chip, inductive position sensor, motor and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315499.6A CN117978023A (en) | 2022-10-26 | 2022-10-26 | Inductive position sensor chip, inductive position sensor, motor and vehicle |
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| CN117978023A true CN117978023A (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211315499.6A Pending CN117978023A (en) | 2022-10-26 | 2022-10-26 | Inductive position sensor chip, inductive position sensor, motor and vehicle |
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| Country | Link |
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| CN (1) | CN117978023A (en) |
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- 2022-10-26 CN CN202211315499.6A patent/CN117978023A/en active Pending
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