CN219227380U

CN219227380U - Motor mechanical signal acquisition device

Info

Publication number: CN219227380U
Application number: CN202223601938.8U
Authority: CN
Inventors: 施其彪; 范涛; 温旭辉
Original assignee: Institute of Electrical Engineering of CAS
Current assignee: Institute of Electrical Engineering of CAS
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-20
Anticipated expiration: 2032-12-30

Abstract

The utility model discloses a motor mechanical signal acquisition device, which comprises: the signal acquisition board and the rotary transformer are coaxially arranged on one side of the motor, and the signal acquisition board is fixed on one end, far away from the motor, of a stator of the rotary transformer; the signal acquisition board is integrated with a processor, and a vibration sensor and a bearing temperature sensor which are connected with the processor; the processor is connected with the rotary transformer. The device effectively avoids the problems that the signal integrity and the transmission efficiency are affected due to scattered arrangement of the sensors and too much overlong connecting wires by intensively arranging the sensors, and effectively improves the signal anti-interference capability; meanwhile, the mode of centralized setting of the sensors can effectively reduce the installation cost and is convenient to overhaul.

Description

Motor mechanical signal acquisition device

Technical Field

The utility model relates to the technical field of driving motors, in particular to a motor mechanical signal acquisition device.

Background

With the development of intelligent network-connected automobiles, higher requirements are put forward on a driving motor, wherein mechanical signals of the motor need to be collected so as to meet the control of the motor. The mechanical signal sensor mainly comprises a rotary transformer and the like, wherein the rotary transformer is positioned at the position of a motor rotating shaft and provides a motor rotor position signal. Existing sensors such as rotary transformers and microcontrollers are distributed at different positions of a driving motor and a driving motor controller, long connecting wiring harnesses are needed to transmit analog signals output by the sensors to the microcontrollers for centralized processing, signal transmission is easy to be interfered, and adverse effects are caused on signal integrity and system integration level of the sensors. For state monitoring requirements such as motor bearing health status monitoring, sensors which are not needed for traditional motor control such as vibration sensors, bearing temperature sensors and the like are needed, but the existing motor is not provided with the sensors generally, and the control requirements are difficult to meet. And the existing sensors, processors and the like are scattered at different positions of the driving motor and the driving motor controller, a longer connecting wire harness is needed to transmit analog signals output by the sensors to the microcontroller for centralized processing, and signal transmission is easy to be interfered and has adverse effects on signal integrity and system integration level of the sensors.

Disclosure of Invention

Therefore, the utility model aims to solve the technical problems that the positions of the electromechanical signal sensors are scattered, the connecting wires are longer, and adverse effects are generated on signal transmission in the prior art, so that the electromechanical signal acquisition device is provided.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the embodiment of the utility model provides a motor mechanical signal acquisition device, which comprises: the signal acquisition board and the rotary transformer are coaxially arranged on one side of the motor, and the signal acquisition board is fixed on one end, far away from the motor, of a stator of the rotary transformer;

the signal acquisition board is integrated with a processor, and a vibration sensor and a bearing temperature sensor which are connected with the processor; the processor is connected with the rotary transformer.

Optionally, the processor is an integrated chip integrated with a conversion module and a communication module, the conversion module is used for converting signals transmitted by the sensor, and the communication module is used for transmitting the converted signals.

Optionally, the device further includes a communication interface integrated on the signal acquisition board, where the communication interface is connected with the communication module and is used to send the converted signal to the vehicle controller.

Optionally, the communication interface is a digital bus communication interface.

Optionally, the rotary transformer is connected with the conversion module and is used for collecting the rotation angle position of the motor rotor.

Optionally, the rotary transformer is a position sensor.

Optionally, the bearing temperature sensor is connected with the conversion module and is used for collecting the temperature of the motor bearing.

Optionally, the bearing temperature sensor is a platinum resistor.

Optionally, the vibration sensor is connected with the conversion module and is used for collecting the vibration frequency and the vibration amplitude of the motor bearing.

Optionally, the signal acquisition board is a PCB circuit board.

The technical scheme of the utility model has the following advantages:

the utility model provides a motor mechanical signal acquisition device, which comprises: the signal acquisition board and the rotary transformer are coaxially arranged on one side of the motor, and the signal acquisition board is fixed on one end, far away from the motor, of a stator of the rotary transformer; the signal acquisition board is integrated with a processor, and a vibration sensor and a bearing temperature sensor which are connected with the processor; the processor is connected with the rotary transformer. The device effectively avoids the problems that the signal integrity and the transmission efficiency are affected due to scattered arrangement of the sensors and too much overlong connecting wires by intensively arranging the sensors, and effectively improves the signal anti-interference capability; meanwhile, the mode of centralized setting of the sensors can effectively reduce the installation cost and is convenient to overhaul.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a mechanical signal acquisition device for an electrical machine according to one embodiment of the present utility model;

fig. 2 is a schematic diagram of an installation position of a electromechanical signal acquisition device according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a signal acquisition board according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The embodiment of the utility model provides a motor mechanical signal acquisition device, which is applied to occasions for acquiring motor mechanical signals, such as a new energy automobile driving motor, as shown in fig. 1-3, and comprises the following steps: the signal acquisition board 1 and the rotary transformer 2 are coaxially arranged on one side of the motor 3, and the signal acquisition board 1 is fixed on one end, far away from the motor, of a stator of the rotary transformer 2; the signal acquisition board 1 is integrated with a processor 4, and a vibration sensor 5 and a bearing temperature sensor 6 which are connected with the processor 4; the processor 4 is connected to the resolver 2.

According to the motor mechanical signal acquisition device, the sensors are arranged in a concentrated mode, so that the problems that signal integrity and transmission efficiency are affected due to scattered arrangement of the sensors and too long connecting wires are effectively avoided, and signal anti-interference capability is effectively improved; meanwhile, the mode of centralized setting of the sensors can effectively reduce the installation cost and is convenient to overhaul.

In a specific embodiment, the processor 4 is an integrated chip integrated with a conversion module and a communication module, where the conversion module is used for converting signals transmitted by the sensor, and the communication module is used for transmitting the converted signals.

In particular, the processor 4 is a microprocessor, which has a smaller volume and a lighter weight and easier module than a conventional central processor. The processor 4 converts analog signals collected by the rotary transformer 2, the vibration sensor 5 and the bearing temperature sensor 6 into digital signals, performs signal processing such as digital filtering, FFT conversion, wavelet conversion and the like, and performs multi-source information fusion and feature extraction, and converts the original sensor signals into feature data with higher signal-to-noise ratio, and optionally comprises bearing vibration RMS value, bearing health state quantity, motor electrical angle, motor rotating speed and the like. And then the characteristic data are transmitted to a motor controller or a whole vehicle controller through a communication interface for further processing. The method comprises the steps of digital filtering, FFT conversion, wavelet conversion and other signal processing, multi-source information fusion and feature extraction, wherein the method converts an original signal of a sensor into feature data with higher signal to noise ratio, which are all applications of the prior art, characterizes functions which can be realized by the prior art, only protects a structure, and does not describe the implementation process in detail. The model of the processor 4 is TMS320F280021. The conversion module is a digital-to-analog converter and converts the analog signals acquired by the sensor into digital signals for transmission.

In an embodiment, the apparatus further includes: and the communication interface 7 is integrated on the signal acquisition board 1, is connected with the communication module and is used for transmitting the converted signals to the whole vehicle controller. Specifically, the converted sensor signals are sent to the motor controller, so that the whole vehicle controller is convenient to further process.

In one embodiment, the communication interface 7 is a digital bus communication interface. Specifically, the model of the communication interface 7 CAN be ISO1050, and the transceiver function is realized by integrating the isolation channel and the CAN transceiver in one package, so that how to insert the isolator between the controller and the transceiver for isolation is not needed, and the design difficulty is reduced while the area of the PCB circuit board is reduced.

In a specific embodiment, the rotary transformer 2 is connected to the conversion module, and is used for collecting the rotation angle position of the motor rotor. Specifically, the resolver 2 is used for measuring the angular displacement and angular velocity of a rotating shaft of a rotating object, and is composed of a stator and a rotor. Wherein the stator winding is used as the primary side of the transformer and receives the exciting voltage. The rotor winding is used as the secondary side of the transformer, and the induction voltage is obtained through electromagnetic coupling. Through the rotation angle position of collection motor rotor, the vehicle control unit of being convenient for monitors the mechanical operation state of motor.

In one embodiment, the rotary transformer 2 is a position sensor. Specifically, the position sensor can sense the rotation angle position of the motor rotor and convert the rotation angle position into an available output signal, so that the available output signal is converted by the processor 4 and then output to the whole vehicle controller, and the whole vehicle controller is convenient for monitoring the state of the motor, so that the motor is overhauled in time when abnormality is found. Other types of position sensors can also be replaced as required.

In a specific embodiment, the bearing temperature sensor 6 is connected to the conversion module and is used for collecting the temperature of the motor bearing. Specifically, through the temperature of gathering motor bearing, can in time analyze the reason of rising temperature when the temperature surpasses normal operating temperature, prevent to lead to bearing trouble to influence motor normal operating because of the high temperature.

In one embodiment, the bearing temperature sensor 6 is a platinum resistor. Specifically, the specific model can select, for example, a platinum resistor PT1000 and a platinum resistor PT100, and the platinum resistor has the characteristics of high precision and stable resistance increase during temperature rise, and the signal acquisition precision can be improved by adopting the platinum resistor.

In a specific embodiment, the vibration sensor 5 is connected to the conversion module, and is used for collecting the vibration frequency and the vibration amplitude of the motor bearing. Specifically, the vibration sensor 5 can accurately collect the vibration condition of the motor in operation by collecting the vibration frequency and vibration amplitude of the bearing and converting the vibration parameter into an electric signal.

In one embodiment, the signal acquisition board 1 is a PCB circuit board. Specifically, the processor 4, the vibration sensor 5 and the bearing temperature sensor 6 are integrated together through the PCB, so that the integration level of the device is effectively improved, connecting wires are reduced, and the problems that the sensor is scattered in position and signal transmission of the sensor is easy to be interfered are effectively avoided.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. An electromechanical signal acquisition device, comprising: the signal acquisition board and the rotary transformer are coaxially arranged on one side of the motor, and the signal acquisition board is fixed on one end, far away from the motor, of a stator of the rotary transformer;

2. The electromechanical signal acquisition device according to claim 1, wherein the processor is an integrated chip integrated with a conversion module and a communication module, the conversion module is configured to convert signals transmitted from the sensor, and the communication module is configured to transmit the converted signals.

3. The electromechanical signal acquisition device of claim 2, further comprising a communication interface integrated on the signal acquisition board, the communication interface being coupled to the communication module for transmitting the converted signal to a vehicle controller.

4. A electromechanical signal acquisition device according to claim 3, characterised in that the communication interface is a digital bus communication interface.

5. The electromechanical signal acquisition device of claim 2, wherein the resolver is coupled to the conversion module for acquiring a rotational angular position of the motor rotor.

6. The electromechanical signal acquisition device of claim 5, wherein the resolver is a position sensor.

7. The electromechanical signal acquisition device according to claim 2, characterized in that the bearing temperature sensor is connected to the conversion module for acquiring the temperature of the motor bearing.

8. The electromechanical signal pickup device according to claim 7, wherein the bearing temperature sensor is a platinum resistor.

9. The electromechanical signal acquisition device according to claim 2, characterized in that the vibration sensor is connected to the conversion module for acquiring the vibration frequency and the vibration amplitude of the electromechanical bearing.

10. The electromechanical signal pickup device of claim 1, wherein the signal pickup board is a PCB circuit board.