CN110987272A - Tooth socket torque and friction torque testing equipment and method for automobile EPS motor - Google Patents
Tooth socket torque and friction torque testing equipment and method for automobile EPS motor Download PDFInfo
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- CN110987272A CN110987272A CN201911290680.4A CN201911290680A CN110987272A CN 110987272 A CN110987272 A CN 110987272A CN 201911290680 A CN201911290680 A CN 201911290680A CN 110987272 A CN110987272 A CN 110987272A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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Abstract
The invention discloses a device and a method for testing tooth space torque and friction torque of an automobile EPS motor, wherein the device comprises: the industrial personal computer is used for controlling the driving module and receiving the data output by the measuring module for analysis and display; 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 measurement module is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be measured so as to realize torque measurement and uploading data obtained by measurement to the industrial personal computer; the EPS motor module to be tested is used for carrying out rotation under the drive of the mechanical rotation of the driving module transmitted by the measuring module so as to generate corresponding tooth socket torque and friction torque; and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature and humidity 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 torque testing, in particular to a device and a method for testing cogging torque and friction torque of an EPS (Electric power steering) motor of an automobile.
Background
The cogging torque is a periodic torque generated by the tendency of approaching to the minimum reluctance position due to the slotting of the armature core within one rotation of the motor when the winding of the permanent magnet synchronous motor is open-circuited. Under the condition that a three-phase winding of the permanent magnet synchronous motor is not electrified and the winding is open-circuited, the rotor is provided with a plurality of positioning points, the rotor is kept at the positioning points in a natural state, and the position of the rotor can be changed only by applying a certain force from the outside, so that the cogging torque is also called as the positioning torque. The cogging torque is mainly generated due to the existence of stator cogging, and the generation of the cogging torque can cause vibration, noise, and difficulty in starting and speed regulation control in the operation of the motor.
Generally, torque measured for a motor includes cogging torque and friction torque of the motor, friction torque at a position different from the measured motor is substantially constant, cogging torque is periodically changed according to theoretical analysis, friction torque is obtained by averaging maximum and minimum values of the measured torque, and cogging torque is obtained by subtracting the friction torque from the measured torque.
The tooth space torque and friction torque testing method of the traditional automobile EPS motor generally adopts an external motor driving mode, a torque sensor is used for collecting torque waveforms, but most of the methods are only quantitative torque measurement at a rotating speed and normal temperature, the testing process is shown in figure 1, and when equipment is started, correction operation is started; if the self-checking is abnormal, the equipment is adjusted until the self-checking is normal, if the self-checking is normal, the tooth space torque and friction torque test is carried out, the traditional tooth space torque and friction torque test mode can only carry out fixed-speed fixed-torque test on the motor to be tested, the mode is single, more dimensionality analysis can not be carried out on the tooth space torque and the friction torque of the motor, frequency domain analysis is not carried out, and the problem that the motor is poor in positioning can not be effectively solved.
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 cogging torque and the friction torque of an automobile EPS motor.
To achieve the above object, the present invention provides a cogging torque and friction torque testing apparatus for an EPS motor of an automobile, including:
the industrial personal computer is used for controlling the driving module and receiving the data output by the measuring module for analysis and display;
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 measurement module is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be measured so as to realize torque measurement and uploading the measured data to the industrial personal computer
The EPS motor module to be tested is used for carrying out rotation under the drive of the mechanical rotation of the driving module transmitted by the measuring module so as to generate corresponding tooth socket torque and friction torque;
and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature and humidity under the control of the industrial personal computer so as to be used for testing.
Preferably, the drive module comprises a servo drive and a servo motor, the servo drive is connected with an output port of the industrial personal computer, an output end of the servo drive is connected to an input end of the servo motor, and a rotating shaft of the servo motor is connected with the measuring module.
Preferably, the measuring module comprises a first coupler, a second coupler and a torque sensor, a rotating shaft of the servo motor is connected to the torque sensor through the first coupler, the torque sensor is connected to a rotating shaft of the EPS motor to be measured through the second coupler, and the output of the torque sensor is connected to the input port of the industrial personal computer.
Preferably, another output port of the industrial personal computer is connected to a control input end of the environment box.
Preferably, the industrial personal computer collects the axial torque of the EPS motor to be measured through the torque sensor, collects torque waveforms through the NI DAQ board card, and calculates friction torque and tooth space torque according to torque data.
Preferably, the cogging and the friction torque are calculated by analyzing and calculating the collected torque waveform, the average value of the torque in one revolution period is the friction torque, the fluctuation component of the friction torque is the cogging torque, the maximum torque is the starting torque, and the fourier analysis is performed to analyze the torque states of the friction torque at different frequencies.
In order to achieve the above object, the present invention further provides a method for testing a cogging torque and a friction torque of an EPS motor of an automobile, comprising the steps of:
and step S1, fixing the EPS motor to be tested in the environment box when the self-checking is normal.
And S2, controlling a driving module to drive a servo motor to drive the EPS motor to be tested to idle passively through an industrial personal computer, setting the rotating speed within a controllable range, setting the environmental temperature of the EPS motor to be tested through an environmental box, testing the torques of the EPS motor to be tested at different rotating speeds and different temperatures, and calculating the friction torque and the tooth space torque according to torque data.
Preferably, the industrial personal computer controls the servo drive servo motor to drive the EPS motor to be tested to idle passively, the rotating speed is set within a controllable range, the environment temperature of the EPS motor to be tested is set through the environment box, the torque sensor is used for collecting the axial torque of the EPS motor to be tested, the NI DAQ board card is used for collecting the torque waveform, and the friction torque and the tooth space torque are calculated according to the torque data.
Preferably, in step S2, the torque test is divided into 2 modes: the first mode is a compatible mode in the prior art, and tooth socket torque and friction torque of the EPS motor to be tested are tested at a constant temperature, a constant rotating speed and a constant load; mode two is the traversal test.
Preferably, the traversal test of the mode two comprises:
step 2.1, setting the temperature and the heat preservation time of the environmental box and the rotating speed of a motor;
step 2.2, keeping the temperature for a plurality of hours according to the specification after the temperature is reached;
step 2.3, starting the system to test the tooth space torque and the friction torque;
and 2.4, judging whether traversal is finished or not, if the traversal is finished, finishing the test, and if the traversal is not finished, modifying the parameters to enter the next round of test.
Compared with the prior art, the tooth space torque and friction torque testing equipment and method for the automobile EPS motor drive the EPS motor to be tested to idle passively by controlling the servo motor, set the rotating speed in a controllable range, set the environmental temperature of the EPS motor to be tested by adopting an environmental box, collect the axial torque of the EPS motor to be tested by using the torque sensor, calculate the average torque (namely, friction torque) and the jumping torque (namely, tooth space torque) according to the torque data by collecting the torque waveform, and realize the temperature and speed change characteristic analysis of the tooth space torque. .
Drawings
FIG. 1 is a flowchart of a cogging torque and a friction torque test of a conventional automotive EPS motor;
FIG. 2 is a system configuration diagram of a cogging torque and friction torque test apparatus of an automotive EPS motor of the present invention;
FIG. 3 is a flow chart of steps of a method for testing cogging torque and friction torque of an automotive EPS motor according to the present invention;
FIG. 4 is a flow chart of a method for testing a cogging torque and a friction torque of an automotive EPS motor according to an embodiment of the invention;
fig. 5 is a schematic waveform diagram of the torque acquired by the NI DAQ board card according to the embodiment of the present 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 cogging torque and friction torque testing apparatus of an automotive EPS motor according to the present invention. As shown in fig. 2, the cogging torque and friction torque testing apparatus of an EPS motor of an automobile according to the present invention includes: industrial Personal Computer (PC)10, drive module 20, measurement module 30, the EPS motor module 40 that awaits measuring and environment box 50 constitute.
The industrial Personal Computer (PC)10 is composed of a display screen, a keyboard and test software, and is used for controlling the driving module 20 and receiving data output by the measuring module 30 for analysis and display; 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 measurement module 30 consists of a first coupling/coupling and a torque sensor and is used for transmitting the mechanical rotation of the driving module 20 to the EPS motor module 40 to be measured to complete torque measurement and uploading data to an industrial Personal Computer (PC) 10; the to-be-tested EPS motor module 40 consists of an to-be-tested EPS motor and is used for carrying and rotating under the driving of the driving module 20 so as to generate corresponding tooth socket torque and friction torque; 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, a rotating shaft of the Servo motor is connected to a torque sensor through a first coupler, and the torque sensor is connected to a rotating shaft of an EPS motor to be tested through a second coupler; the other output port of the industrial Personal Computer (PC) is connected to the control input end of the environment box 50; the output of the torque sensor is connected to the input port of an industrial Personal Computer (PC).
FIG. 3 is a flow chart of steps of a method for testing cogging torque and friction torque of an EPS motor of an automobile according to the present invention. As shown in FIG. 3, the invention discloses a method for testing cogging torque and friction torque of an EPS motor of an automobile, which comprises the following steps:
and step S1, when the self-checking is normal, fixing the EPS motor to be tested in the environment box, wherein the normal self-checking means that the equipment self-checking is normal, namely, the state of the equipment when the EPS motor is not loaded is checked.
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 idle passively, the rotating speed is set in a controllable range, the environment temperature of the EPS motor to be tested is set through the environment box, the torques of the EPS motor to be tested at different rotating speeds and different temperatures are tested, and the average torque (namely, friction torque) and the jumping torque (namely, tooth space torque) are calculated according to the torque data. Specifically, an industrial personal computer controls a Servo drive (Servo Amp) to drive a Servo motor, so that an EPS motor to be tested is driven to idle passively, the rotating speed is set in a controllable range, the environment temperature of the EPS motor to be tested is set through an environment box, a torque sensor is used for collecting axial torque of the EPS motor to be tested, a torque waveform is collected through an NI DAQ board card, and calculation is performed according to torque data to calculate average torque (namely friction torque) and bounce torque (namely tooth space torque).
In the embodiment of the present invention, the torque test is divided into 2 modes: the first mode is a compatible mode in the prior art, and tooth socket torque and friction torque of the EPS motor to be tested are tested at a constant temperature, a constant rotating speed and a constant load; the second mode is traversal test, and the test steps are as follows:
step 2.1, setting the temperature and the heat preservation time of the environmental box and the rotating speed of a motor;
step 2.2, keeping the temperature for a plurality of hours according to the specification after the temperature is reached;
step 2.3, starting the system to test the tooth space torque and the friction torque;
and 2.4, judging whether traversal is finished or not, if the traversal is finished, finishing the test, and if the traversal is not finished, modifying the parameters to enter the next round of test.
FIG. 4 is a flow chart of a method for testing cogging torque and friction torque of an automotive EPS motor in an embodiment of the invention. As shown in fig. 4, in this embodiment, the cogging torque and friction torque test procedure of the EPS motor of the vehicle is as follows:
the method comprises the steps of firstly, detecting an EPS motor to be detected, carrying out correction operation, judging the state of the EPS motor to be detected, carrying out equipment adjustment if the self-detection is abnormal (NG), and entering the second step if the self-detection is normal (OK);
secondly, torque testing is carried out in 2 modes, wherein the first mode is a compatible mode in the prior art, and a motor to be tested is subjected to tooth socket torque and friction torque testing at a constant temperature, a constant rotating speed and a constant load; mode two is the traversal test.
Step 2.1, setting the temperature and the heat preservation time of the environmental box and the rotating speed of a motor;
step 2.2, keeping the temperature for a plurality of hours according to the specification after the temperature is reached;
step 2.3, starting the system to test the tooth space torque and the friction torque;
and 2.4, judging whether traversal is finished or not, if the traversal is finished, finishing the test, and if the traversal is not finished, modifying the parameters to enter the next round of test.
Fig. 5 is a waveform of torque acquired by the NI DAQ board card in the embodiment of the present invention, and a tooth space and a friction torque are calculated by performing analysis and calculation according to the waveform, where the average value of torque in one rotation period is the friction torque, the fluctuation component is the tooth space torque, the maximum torque is the starting torque, and fourier analysis is performed to analyze the torque states of the torque in different frequencies.
According to the invention, the driving motor is controlled to drive the EPS motor to be tested to idle passively, the torque sensor is used for collecting the axial torque of the motor, so that the cogging torque and the friction torque are calculated, the analytic rotating speed can reach 1000rpm/min, the torque under the condition of minus 45-85 ℃ can be collected and calculated, and the analysis of the temperature and speed change characteristics of the cogging torque is realized
In summary, according to the tooth space torque and friction torque testing device and method for the automobile EPS motor, the servo motor is controlled to drive the EPS motor to be tested to idle passively, the rotating speed is set within the controllable range, the environment temperature of the EPS motor to be tested is set by adopting the environment box, the torque sensor is used for collecting the axial torque of the EPS motor to be tested, the average torque (namely, friction torque) and the bounce torque (namely, tooth space torque) are calculated according to the torque data by collecting the torque waveform, and the temperature and speed change characteristic analysis of the tooth space torque 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 (10)
1. A cogging torque and friction torque testing apparatus of an automotive EPS motor, comprising:
the industrial personal computer is used for controlling the driving module and receiving the data output by the measuring module for analysis and display;
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 measurement module is used for transmitting the mechanical rotation of the driving module to the EPS motor module to be measured so as to realize torque measurement and uploading data obtained by measurement to the industrial personal computer;
the EPS motor module to be tested is used for carrying out rotation under the drive of the mechanical rotation of the driving module transmitted by the measuring module so as to generate corresponding tooth socket torque and friction torque;
and the environment box is used for placing the EPS motor module to be tested and generating corresponding environment temperature and humidity under the control of the industrial personal computer so as to be used for testing.
2. The cogging torque and friction torque test apparatus of an EPS motor of an automobile according to claim 1, wherein: the drive module comprises a servo drive and a servo motor, the servo drive is connected with an output port of the industrial personal computer, an output end of the servo drive is connected to an input end of the servo motor, and a rotating shaft of the servo motor is connected with the measuring module.
3. The cogging torque and friction torque test apparatus of an EPS motor of an automobile according to claim 2, wherein: the measuring module comprises a first coupler, a second coupler and a torque sensor, a rotating shaft of the servo motor is connected to the torque sensor through the first coupler, the torque sensor passes through the second coupler and is connected to a rotating shaft of the EPS motor to be measured, and the output of the torque sensor is connected to the input port of the industrial personal computer.
4. The cogging torque and friction torque test apparatus of an EPS motor of an automobile according to claim 3, wherein: and the other output port of the industrial personal computer is connected to the control input end of the environment box.
5. The cogging torque and friction torque test apparatus of an EPS motor of an automobile according to claim 3, wherein: the industrial personal computer collects axial torque of the EPS motor to be tested through the torque sensor, collects torque waveforms through the NIDAQ board card, and calculates friction torque and tooth space torque according to torque data.
6. The cogging torque and friction torque test apparatus of an EPS motor of an automobile according to claim 5, wherein: analyzing and calculating the tooth space and the friction torque according to the acquired torque waveform, wherein the average value of the torque in a rotation period is the friction torque, the fluctuation component of the friction torque is the tooth space torque, the maximum torque is the starting torque, and Fourier analysis is performed to analyze the torque states of the friction torque under different frequencies.
7. A tooth space torque and friction torque testing method of an automobile EPS motor comprises the following steps:
and step S1, fixing the EPS motor to be tested in the environment box when the self-checking is normal.
And S2, controlling a driving module to drive a servo motor to drive the EPS motor to be tested to idle passively through an industrial personal computer, setting the rotating speed within a controllable range, setting the environmental temperature of the EPS motor to be tested through an environmental box, testing the torques of the EPS motor to be tested at different rotating speeds and different temperatures, and calculating the friction torque and the tooth space torque according to torque data.
8. The method for testing the cogging torque and the friction torque of the EPS motor of an automobile according to claim 7, wherein: the industrial control computer controls the servo drive servo motor to drive the EPS motor to be tested to idle passively, the rotating speed is set within a controllable range, the environment temperature of the EPS motor to be tested is set through the environment box, the torque sensor is used for collecting the axial torque of the EPS motor to be tested, the NIDAQ board card is used for collecting torque waveforms, and the friction torque and the tooth socket torque are calculated according to the torque data.
9. The method for testing the cogging torque and the friction torque of the EPS motor of an automobile according to claim 8, wherein: in step S2, the torque test is divided into 2 modes: the first mode is a compatible mode in the prior art, and tooth socket torque and friction torque of the EPS motor to be tested are tested at a constant temperature, a constant rotating speed and a constant load; mode two is the traversal test.
10. The method for testing cogging torque and friction torque of an EPS motor of an automobile according to claim 9, wherein the traversing test of the second mode comprises:
step 2.1, setting the temperature and the heat preservation time of the environmental box and the rotating speed of a motor;
step 2.2, keeping the temperature for a plurality of hours according to the specification after the temperature is reached;
step 2.3, starting the system to test the tooth space torque and the friction torque;
and 2.4, judging whether traversal is finished or not, if the traversal is finished, finishing the test, and if the traversal is not finished, modifying the parameters to enter the next round of test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911290680.4A CN110987272A (en) | 2019-12-16 | 2019-12-16 | Tooth socket torque and friction torque testing equipment and method for automobile EPS motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911290680.4A CN110987272A (en) | 2019-12-16 | 2019-12-16 | Tooth socket torque and friction torque testing equipment and method for automobile EPS motor |
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| CN110987272A true CN110987272A (en) | 2020-04-10 |
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| CN201911290680.4A Pending CN110987272A (en) | 2019-12-16 | 2019-12-16 | Tooth socket torque and friction torque testing equipment and method for automobile EPS motor |
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Cited By (2)
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| CN111504531A (en) * | 2020-05-12 | 2020-08-07 | 杭州沃镭智能科技股份有限公司 | Motor torque measuring device |
| CN112254853A (en) * | 2020-10-12 | 2021-01-22 | 广东博智林机器人有限公司 | Motor cogging torque testing method and device, electronic equipment and medium |
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