CN111366774A - Reverse electromotive force testing equipment and method for automobile EPS motor - Google Patents
Reverse electromotive force testing equipment and method for automobile EPS motor Download PDFInfo
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- CN111366774A CN111366774A CN202010194680.0A CN202010194680A CN111366774A CN 111366774 A CN111366774 A CN 111366774A CN 202010194680 A CN202010194680 A CN 202010194680A CN 111366774 A CN111366774 A CN 111366774A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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Abstract
The invention discloses a reverse electromotive force test device and a test method of an automobile EPS motor, wherein the test device comprises: the industrial personal computer is used for controlling the driving module and the environment box and analyzing and displaying the voltage output by the EPS motor module acquired by the data acquisition card; the driving module is used for receiving the instruction of the industrial personal computer and rotating at a rotating speed specified by the instruction; the coupler is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be tested; the EPS motor module to be tested is arranged in the environment box and is used for rotating under the driving of the driving module, and a motor of the EPS motor module to be tested generates reverse electromotive force while rotating; and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature under the control of the industrial personal computer so as to be used for testing.
Description
Technical Field
The invention relates to the technical field of back electromotive force testing, in particular to back electromotive force testing equipment and a back electromotive force testing method for an automobile EPS (Electric power steering) motor.
Background
The traditional method for testing the reverse electromotive force of the EPS motor of the automobile generally adopts an external motor driving mode, an NIPCI-6133 board card is used for collecting voltage waveforms, the testing process is shown in figure 1, the EPS motor of the automobile is installed at first, then the voltage waveforms are collected by the NIPCI-6133 board card for testing the reverse electromotive force, and finally the testing is finished, but most of the transmission testing methods are only reverse electromotive force measurement at a rotating speed and normal temperature, so that the reverse electromotive force of the motor cannot be analyzed in more dimensions, frequency domain analysis is not performed, and the problem of poor motor cannot be effectively positioned.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a device and a method for testing the back electromotive force of an automobile EPS motor.
To achieve the above object, the present invention provides a back electromotive force testing apparatus of an EPS motor of an automobile, including:
the industrial personal computer is used for controlling the driving module and the environment box and analyzing and displaying the voltage output by the EPS motor module acquired by the data acquisition card;
the driving module is used for receiving the instruction of the industrial personal computer and rotating at a rotating speed specified by the instruction;
the coupler is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be tested;
the EPS motor module to be tested is arranged in the environment box and is used for rotating under the driving of the driving module, and a motor of the EPS motor module to be tested generates reverse electromotive force while rotating;
and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature under the control of the industrial personal computer so as to be used for testing.
Preferably, an output port of the industrial computer is connected to a servo-driven input end of the driving module, an output end of the servo-driven input end is connected to an input end of the servo motor, a rotating shaft of the servo motor is connected to a rotating shaft of the EPS motor to be tested of the EPS motor module to be tested through the coupler, a reverse electromotive force output by the EPS motor to be tested is connected to an input end of the data acquisition card of the industrial computer, and another output port of the industrial computer is connected to a control input end of the environment box.
In order to achieve the above object, the present invention further provides a method for testing a back electromotive force of an EPS motor of an automobile, comprising the steps of:
step S1, when the motor is normal, fixing the EPS motor to be tested in an environment box;
step S2, the industrial personal computer control driving module drives the servo motor to drive the EPS motor to be tested to rotate, the motor rotating speed is set within a controllable range, the environment temperature of the EPS motor to be tested is set through an environment box, the voltage output by the EPS motor to be tested is collected through a data acquisition card, and the reverse electromotive force waveforms at different rotating speeds and temperatures are obtained;
and step S3, performing analysis operation according to the obtained waveform, calculating the reverse electromotive force and the ratio Ke of the reverse electromotive force to the angular speed of the EPS motor to be tested, performing harmonic distortion analysis, and obtaining the waveform fundamental frequency, the amplitude level under each harmonic and the total harmonic distortion.
Preferably, the step S2 further includes:
s200, setting the temperature of an environment box through an industrial personal computer;
step S201, setting the rotating speed of the EPS motor to be tested by an industrial personal computer, controlling a servo drive to drive a servo motor, driving the EPS motor to be tested to rotate at the set rotating speed, and acquiring the voltage output by the EPS motor to be tested by using a data acquisition card to obtain the reverse electromotive force waveform output by the EPS motor to be tested at the rotating speed and temperature;
step S202, changing the rotating speed of the EPS motor to be tested in a controllable range, returning to step S201, and obtaining the reverse electromotive force waveform output by the EPS motor to be tested at the temperature and different rotating speeds;
and S203, changing the temperature of the environment box within a controllable range, and returning to the step S200 to obtain the reverse electromotive force waveforms output by the EPS motor to be tested at different temperatures and different rotating speeds.
Preferably, in step S3, according to the harmonic distortion algorithm, the obtained waveform is extracted for one cycle and then used as the basic data of the distortion algorithm, and the waveform fundamental frequency, the amplitude level under each harmonic and the total harmonic distortion are calculated through the distortion algorithm.
Preferably, in step S3, the peak values of four sine waves in one period are obtained according to the basic voltage data, and the back electromotive force is an average value of the peak values of the 4 sine waves or a maximum value of the 4 peak values.
Compared with the prior art, the reverse electromotive force testing equipment and the testing method thereof for the automobile EPS motor have the advantages that the servo motor is used as the driving motor to set the rotating speed in a controllable range, the temperature box is used for setting the environment temperature of the motor, the data acquisition card is used for acquiring the voltage waveform, the peak voltage and the average voltage of a complete period are calculated and analyzed according to the voltage data, the waveform is subjected to harmonic analysis, and the temperature and speed change characteristic analysis of the reverse electromotive force of the motor is realized.
Drawings
FIG. 1 is a flow chart of a conventional back EMF test for an automotive EPS motor;
FIG. 2 is a system configuration diagram of a back electromotive force testing apparatus of an EPS motor of an automobile according to the present invention;
FIG. 3 is a flowchart illustrating steps of a method for testing a back electromotive force of an EPS motor of an automobile according to the present invention;
FIG. 4 is a flow chart of a back EMF test according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a waveform of a back electromotive force output by the EPS motor to be tested according to the embodiment of the invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 2 is a system configuration diagram of a back electromotive force testing apparatus of an automobile EPS motor according to the present invention. As shown in fig. 2, the present invention provides a back electromotive force testing apparatus of an EPS motor of an automobile, comprising: industrial computer (PC)10, drive module 20, shaft coupling 30, the EPS motor module 40 that awaits measuring and environment box 50 constitute.
The industrial Personal Computer (PC)10 is composed of a data acquisition card (typical acquisition card is PCI-6133 card of NI), a display screen, a keyboard and test software, and is used for controlling the driving module 20 and the environment box 50 and analyzing and displaying the voltage output by the EPS motor module 40 acquired by the data acquisition card; the driving module 20 consists of a Servo driver (serv Amp) and a Servo motor and is used for receiving an instruction of the industrial Personal Computer (PC)10 and rotating at a rotating speed specified by the instruction; the coupler 30 is used for transmitting the mechanical rotation of the driving module 20 to the EPS motor module 40 to be tested; the to-be-tested EPS motor module 40 consists of an EPS motor to be tested and is used for rotating under the driving of the driving module 20, and the motor rotates and simultaneously generates reverse electromotive force; and the environment box 50 is used for placing the EPS motor to be tested and generating fixed environment temperature, humidity and the like under the control of an industrial Personal Computer (PC)10 for testing.
An output port of an industrial Personal Computer (PC) is connected to an input end of a Servo drive (ServoAmp), an output end of the Servo drive (ServoAmp) is connected to an input end of a Servo motor, and a rotating shaft of the Servo motor is connected to a rotating shaft of an EPS motor to be tested through a coupler; the reverse electromotive force output by the EPS motor is connected to the input end of a data acquisition card, and the data acquisition card is usually inserted into a PCI slot of an industrial personal computer; another output port of the industrial Personal Computer (PC) is connected to a control input port of the environment box 50.
Fig. 3 is a flowchart illustrating steps of a method for testing a back electromotive force of an EPS motor of an automobile according to the present invention. As shown in fig. 3, the method for testing the back electromotive force of the EPS motor of the vehicle according to the present invention includes the following steps:
and step S1, when the motor is normal, fixing the EPS motor to be tested in the environment box.
And step S2, the industrial personal computer controls the driving module to drive the servo motor to drive the EPS motor to be tested to rotate, the rotating speed of the motor is set within a controllable range, the environmental temperature of the EPS motor to be tested is set through the environmental box, the voltage output by the EPS motor to be tested is collected by the data acquisition card, and the reverse electromotive force waveforms at different rotating speeds and temperatures are obtained.
Specifically, step S2 further includes:
s200, setting the temperature of an environment box through an industrial personal computer, namely setting the environment temperature of the EPS motor to be tested;
step S201, setting the rotating speed of the EPS motor to be tested by an industrial personal computer, controlling a servo drive to drive a servo motor, driving the EPS motor to be tested to rotate at the set rotating speed, and acquiring the voltage output by the EPS motor to be tested by using a data acquisition card to obtain the reverse electromotive force waveform output by the EPS motor to be tested at the rotating speed and temperature;
step S202, changing the rotating speed of the EPS motor to be tested in a controllable range, returning to step S201, and obtaining the reverse electromotive force waveform output by the EPS motor to be tested at the temperature and different rotating speeds; in the specific embodiment of the present invention, a plurality of rotation speed values are determined within a controllable range, the rotation speed of the EPS motor to be tested is sequentially changed to the plurality of rotation speed values, and the step 201 is returned to, and the back electromotive force waveform output by the EPS motor to be tested at the temperature and the writing rotation speed value is obtained;
and S203, changing the temperature of the environment box within a controllable range, and returning to the step S200 to obtain the reverse electromotive force waveforms output by the EPS motor to be tested at different temperatures and different rotating speeds. In the specific embodiment of the invention, a plurality of temperature points are determined in a controllable range, the temperature of the environment box is sequentially changed to each temperature point, and the step 200 is returned, so that the reverse electromotive force waveforms output by the EPS motor to be tested at each temperature point and different rotating speeds are obtained.
And step S3, analyzing and calculating according to the obtained waveform, calculating the ratio Ke of the back electromotive force and the induced voltage to the angular velocity, analyzing harmonic distortion, and obtaining the amplitude level and the total harmonic distortion under the waveform fundamental frequency and each subharmonic.
In an embodiment of the present invention, a full-period voltage is basic data for performing the operation, the period is a time taken by the motor to rotate one cycle, the full-period voltage refers to voltage data collected during one cycle of the motor, and one period of data normally includes 4 sine waves.
Fig. 4 is a flowchart of a method for testing a back electromotive force of an EPS motor of an automobile according to an embodiment of the present invention. As shown in fig. 4, in this embodiment, the procedure of testing the back electromotive force of the EPS motor of the vehicle is as follows:
the method comprises the steps of firstly, placing an EPS motor to be tested in an environment box, detecting the EPS motor to be tested, carrying out correction operation, judging the state of the EPS motor to be tested, carrying out equipment adjustment if the EPS motor to be tested is abnormal (NG), and entering the second step if the EPS motor to be tested is normal (OK);
setting the temperature of an environment box through an industrial personal computer, keeping for 2 hours after the temperature of the environment box reaches a set temperature, changing the rotating speed of the EPS motor to be tested within a controllable range within the two hours, controlling a servo drive servo motor to drive the EPS motor to be tested to rotate at the set rotating speed, and acquiring the voltage output by the EPS motor to be tested by using a data acquisition card to obtain the reverse electromotive force waveform output by the EPS motor to be tested at the set temperature and different rotating speeds; FIG. 5 shows the waveform of the back electromotive force collected at a normal temperature of 25 ℃ and a rotation speed of 1000 rpm/min.
And thirdly, changing the temperature of the environmental box and returning to the second step to obtain the reverse electromotive force waveforms output by the EPS motor to be tested at different temperatures and different rotating speeds.
According to the invention, the driving motor is controlled to drive the EPS motor to be tested to rotate, the voltage is collected by using the NIPCI-6133 board card of the American national instrument, the back electromotive force is calculated, and meanwhile, harmonic analysis is carried out, so that the analysis rotating speed can reach 1500rpm/min, the back electromotive force under the condition of minus 45-85 ℃ can be collected and analyzed, and the temperature and speed change characteristic analysis of the back electromotive force of the EPS motor to be tested is realized.
In summary, according to the device and the method for testing the back electromotive force of the automobile EPS motor, the servo motor is used as the driving motor to set the rotating speed in the controllable range, the incubator is used to set the environmental temperature of the motor, the data acquisition card is used to acquire the voltage waveform, the peak voltage and the average voltage of a complete period are calculated and analyzed according to the voltage data, the waveform is subjected to harmonic analysis, and the analysis of the temperature and speed change characteristics of the back electromotive force of the motor is realized.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (6)
1. A back electromotive force testing apparatus of an EPS motor of an automobile, comprising:
the industrial personal computer is used for controlling the driving module and the environment box and analyzing and displaying the voltage output by the EPS motor module acquired by the data acquisition card;
the driving module is used for receiving the instruction of the industrial personal computer and rotating at a rotating speed specified by the instruction;
the coupler is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be tested;
the EPS motor module to be tested is arranged in the environment box and is used for rotating under the driving of the driving module, and a motor of the EPS motor module to be tested generates reverse electromotive force while rotating;
and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature under the control of the industrial personal computer so as to be used for testing.
2. The apparatus for testing a reverse electromotive force of an EPS motor of an automobile according to claim 1, wherein: an delivery outlet of industrial computer is connected to drive module's servo drive's input, and this servo drive's output is connected to servo motor's input, and servo motor's rotation axis passes through coupling joint is to the EPS motor's that awaits measuring rotation axis of the EPS motor module that awaits measuring, the reverse electromotive force of the EPS motor output that awaits measuring be connected to set up in the data acquisition card's of industrial computer input, another delivery outlet of industrial computer is connected to the control input of environment box.
3. A method for testing the back electromotive force of an automobile EPS motor comprises the following steps:
step S1, when the motor is normal, fixing the EPS motor to be tested in an environment box;
step S2, the industrial personal computer control driving module drives the servo motor to drive the EPS motor to be tested to rotate, the motor rotating speed is set within a controllable range, the environment temperature of the EPS motor to be tested is set through an environment box, the voltage output by the EPS motor to be tested is collected through a data acquisition card, and the reverse electromotive force waveforms at different rotating speeds and temperatures are obtained;
and step S3, performing analysis operation according to the obtained waveform, calculating the reverse electromotive force and the ratio Ke of the reverse electromotive force to the angular speed of the EPS motor to be tested, performing harmonic distortion analysis, and obtaining the waveform fundamental frequency, the amplitude level under each harmonic and the total harmonic distortion.
4. The method for testing back electromotive force of an EPS motor of an automobile according to claim 3, wherein the step S2 further comprises:
s200, setting the temperature of an environment box through an industrial personal computer;
step S201, setting the rotating speed of the EPS motor to be tested by an industrial personal computer, controlling a servo drive to drive a servo motor, driving the EPS motor to be tested to rotate at the set rotating speed, and acquiring the voltage output by the EPS motor to be tested by using a data acquisition card to obtain the reverse electromotive force waveform output by the EPS motor to be tested at the rotating speed and temperature;
step S202, changing the rotating speed of the EPS motor to be tested in a controllable range, returning to step S201, and obtaining the reverse electromotive force waveform output by the EPS motor to be tested at the temperature and different rotating speeds;
and S203, changing the temperature of the environment box within a controllable range, and returning to the step S200 to obtain the reverse electromotive force waveforms output by the EPS motor to be tested at different temperatures and different rotating speeds.
5. The method for testing the back electromotive force of an EPS motor of an automobile according to claim 3, characterized in that: in step S3, according to the harmonic distortion algorithm, the obtained waveform is extracted for one cycle and used as the basic data of the distortion algorithm, and the amplitude level and the total harmonic distortion under the waveform fundamental frequency and each subharmonic are calculated by the distortion algorithm.
6. The method for testing the back electromotive force of an EPS motor of an automobile according to claim 5, characterized in that: in step S3, the peak values of four sine waves in one period are obtained according to the basic voltage data, and the back electromotive force is the average value of the peak values of the 4 sine waves or the maximum value of the 4 peak values.
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| CN202010194680.0A CN111366774A (en) | 2020-03-19 | 2020-03-19 | Reverse electromotive force testing equipment and method for automobile EPS motor |
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| CN202010194680.0A CN111366774A (en) | 2020-03-19 | 2020-03-19 | Reverse electromotive force testing equipment and method for automobile EPS motor |
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Cited By (1)
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Application publication date: 20200703 |