CN109060213B - Method and system for evaluating motor torque of electric scroll compressor - Google Patents
Method and system for evaluating motor torque of electric scroll compressor Download PDFInfo
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- CN109060213B CN109060213B CN201810818363.4A CN201810818363A CN109060213B CN 109060213 B CN109060213 B CN 109060213B CN 201810818363 A CN201810818363 A CN 201810818363A CN 109060213 B CN109060213 B CN 109060213B
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Abstract
The invention discloses an evaluation method and a test system for motor torque of an electric scroll compressor, wherein the evaluation method comprises the steps of connecting a motor rotor of the electric scroll compressor with a dynamometer so as to realize synchronous rotation; controlling the dynamometer to load a preset loading amount, and adjusting the rotating speed of a motor of the compressor within a preset rotating speed range; judging whether the compressor motor is out of step within a preset rotating speed range; if the step-out phenomenon does not occur, increasing the loading capacity of the dynamometer and adjusting the rotating speed of the compressor motor until the step-out phenomenon occurs in the compressor motor; if the step loss phenomenon occurs, recording the current loading capacity of the dynamometer and the rotating speed of the motor of the compressor; and if the actual torque of the compressor during actual working under the recorded motor rotating speed is smaller than the recorded dynamometer loading capacity, evaluating that the motor torque of the electric scroll compressor is qualified, otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified. The evaluation method can reasonably evaluate the reliability of the compressor motor drive in practical application, ensure high efficiency and stability of products and improve user experience.
Description
Technical Field
The invention relates to the field of compressors, in particular to an assessment method and a test system for motor torque of an electric scroll compressor.
Background
In recent years, new energy calls are increasingly more popular, the popularization strength of electric vehicles is greatly increased, electric air conditioners play an especially important role on pure electric vehicles, and as core components of compressors, the efficiency of a motor and the evaluation of the torque range of the motor become decisive factors of an excellent compressor.
Most of motors of the electric scroll compressor are of inner rotor type, a rotor is formed by die casting of silicon steel sheets, a stator is formed by winding of three-phase windings according to a certain sequence, and the direction of a magnetic field is changed by changing the current direction of the three-phase windings through a driving circuit, so that the rotor is driven to rotate at a high speed. The torque of the motor directly determines the loading capacity of the motor, and a driving program of the compressor is designed, wherein the maximum loading capacity, namely the exhaust pressure limit value of the compressor is determined firstly, and then the corresponding torque range of the motor is determined. Therefore, the motor can be ensured not to be out of step in the use process, and the safe and comfortable driving of a user is guaranteed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an evaluation method of motor torque of an electric scroll compressor, which reasonably evaluates the reliability of a newly designed compressor motor drive in practical application, ensures high efficiency and stability of products and improves experience, and the technical scheme is as follows:
in one aspect, the present invention provides a method for evaluating motor torque of an electric scroll compressor, the method comprising:
connecting a motor rotor of the electric scroll compressor with a dynamometer to realize synchronous rotation;
controlling the dynamometer to load a preset loading amount, and adjusting the rotating speed of a compressor motor within a preset rotating speed range;
judging whether the compressor motor is out of step within a preset rotating speed range;
if the step-out phenomenon does not occur, increasing the loading capacity of the dynamometer and adjusting the rotating speed of a compressor motor until the step-out phenomenon occurs to the compressor motor;
if the step loss phenomenon occurs, recording the current loading capacity of the dynamometer and the rotating speed of the motor of the compressor;
and if the actual torque of the compressor during actual working under the recorded motor rotating speed is smaller than the recorded dynamometer loading amount, evaluating that the motor torque of the electric scroll compressor is qualified, otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
Further, the actual torque at the recorded motor speed at which the compressor actually operates is obtained by:
under the standard working condition, testing the actual input power of the compressor under the condition of the rotating speed of the motor;
the actual torque is obtained according to the following equation:
t is 9550 XP/n, wherein T is torque, P is compressor actual input power, and n is motor speed.
In another aspect, the present invention provides a method for evaluating motor torque of an electric scroll compressor, including:
connecting a motor rotor of the electric scroll compressor with a dynamometer to realize synchronous rotation;
controlling the dynamometer to load a preset loading amount, and adjusting the rotating speed of a compressor motor within a preset rotating speed range;
judging whether the compressor motor is out of step within a preset rotating speed range;
if the step-out phenomenon does not occur, increasing the loading capacity of the dynamometer and adjusting the rotating speed of a compressor motor until the step-out phenomenon occurs to the compressor motor;
if the step loss phenomenon occurs, recording the current loading capacity of the dynamometer and the rotating speed of the motor of the compressor;
and judging whether the power of the corresponding compressor is larger than the rated power of the compressor when the compressor is out of step, if so, evaluating that the motor torque of the electric scroll compressor is qualified, and otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
Further, the compressor power corresponding to the step loss is obtained by the following formula:
and T is 9550 multiplied by P/n, wherein T is the recorded loading amount of the dynamometer, n is the recorded rotating speed of the motor of the compressor, and P is the corresponding compressor power when the step is out.
Further, the evaluation method further includes evaluating a driving efficiency of the compressor motor by the following formula:
eta is P1/P0, wherein eta is the driving efficiency, P1 is the compressor power loaded by the dynamometer, and P0 is the actual input power of the compressor.
Further, the compressor actual input power is obtained by:
measuring input voltage and current of a driving circuit of the compressor;
and calculating to obtain the actual input power of the compressor according to the input voltage and the input current of the driving circuit.
On the other hand, the invention provides a system for testing the motor torque of the electric scroll compressor, which comprises the electric scroll compressor, a dynamometer, a PC (personal computer), a motor performance tester and an electrical parameter measuring instrument, wherein a motor output shaft of the electric scroll compressor is connected with the dynamometer, the motor performance tester is respectively connected with the PC and the dynamometer, the motor performance tester is used for controlling the loading capacity of the dynamometer, the electrical parameter measuring instrument is respectively connected with the electric scroll compressor and the PC, and the electrical parameter measuring instrument is used for measuring the input voltage and the current of a driving circuit of the electric scroll compressor.
Further, the dynamometer is a magnetic powder dynamometer.
Further, the motor performance tester is connected with the PC and the dynamometer through an RS-232 serial communication line, the electrical parameter measuring instrument is connected with the PC through the RS-232 serial communication line, and the PC is communicated with the electric scroll compressor CAN.
Further, the electric scroll compressor is reliably connected with the dynamometer through the transmission shaft so as to realize synchronous rotation.
The technical scheme provided by the invention has the following beneficial effects:
a. the test system platform has a simple structure and can accurately simulate the loaded working condition of the compressor;
b. the evaluation method can accurately evaluate whether the motor torque of the compressor reaches the standard or not, and improves the reliability of the compressor in actual work.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a first method of evaluating motor torque of an electric scroll compressor according to an embodiment of the present invention;
FIG. 2 is a flow chart of a second method of estimating motor torque for an electric scroll compressor provided in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a system for testing motor torque of an electric scroll compressor according to an embodiment of the present invention.
Wherein the reference numerals include: the device comprises an electric scroll compressor, a 2-dynamometer, a 3-PC, a 4-motor performance tester and a 5-electrical parameter measuring instrument.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In a preferred embodiment of the present invention, there is provided a method of evaluating motor torque of an electric scroll compressor, see fig. 1, comprising:
and S11, reliably connecting the motor rotor of the electric scroll compressor with the dynamometer to realize synchronous rotation.
And S12, controlling the dynamometer to load a preset load.
Specifically, the loading amount of the dynamometer is adjusted from small to large, for example, the preset loading amount may be 5 n.m.
And S13, adjusting the rotating speed of the compressor motor within a preset rotating speed range.
The PC controls the compressor to rotate within the corresponding rotating speed range requirement of the product, for example, the range of 0-4000 rpm.
S14, judging whether the compressor motor is out of step within a preset rotating speed range;
if no step-out occurs, S15 is executed, and if a step-out occurs, S16 and S17 are executed.
And S15, increasing the loading amount of the dynamometer, and repeatedly executing S13 and S14.
Namely, if the step-out phenomenon does not occur in the whole rotating speed range of 0-4000rpm, the loading capacity of the dynamometer is increased, and the rotating speed test of 0-4000rpm is repeated until the step-out phenomenon occurs at a certain rotating speed point.
And S16, recording the current dynamometer loading amount and the current compressor motor speed.
And S17, if the actual torque of the compressor during actual working under the recorded motor speed is smaller than the recorded dynamometer loading amount, evaluating that the motor torque of the electric scroll compressor is qualified, otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
Wherein the actual torque at the recorded motor speed at the time of actual operation of the compressor is obtained by:
under the standard working condition, under the condition that the test condition is that the motor rotating speed (rotating speed when step loss occurs) is adopted, the input voltage and current of a driving circuit of the compressor are measured, and the actual input power of the compressor is further obtained (the power is equal to the input voltage multiplied by the current of the driving circuit);
the actual torque is obtained according to the following equation:
t is 9550 XP/n, wherein T is the actual torque to be solved, P is the actual input power of the compressor, and n is the rotating speed of the motor. And if the obtained actual torque is smaller than the dynamometer loading amount recorded when step-out occurs, evaluating that the motor torque of the electric scroll compressor is qualified, otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
In another embodiment of the present invention, a second method for estimating motor torque of an electric scroll compressor is provided, see FIG. 2, comprising the following steps:
and S21, connecting the motor rotor of the electric scroll compressor with a dynamometer to realize synchronous rotation.
And S22, controlling the dynamometer to load a preset load.
Specifically, the loading amount of the dynamometer is adjusted from small to large, for example, the preset loading amount may be 5 n.m.
And S23, adjusting the rotating speed of the compressor motor within a preset rotating speed range.
The PC controls the compressor to rotate within the corresponding rotating speed range requirement of the product, for example, the range of 0-4000 rpm.
And S24, judging whether the compressor motor is out of step within a preset rotating speed range.
If no step-out phenomenon occurs, executing S25; if the step loss occurs, S26 and S27 are executed.
And S25, increasing the loading amount of the dynamometer, and repeatedly executing S23 and S24.
Namely, if the step-out phenomenon does not occur in the whole rotating speed range of 0-4000rpm, the loading capacity of the dynamometer is increased, and the rotating speed test of 0-4000rpm is repeated until the step-out phenomenon occurs at a certain rotating speed point.
And S26, recording the current dynamometer loading amount and the current compressor motor speed.
And S27, judging whether the power of the corresponding compressor is larger than the rated power of the compressor when the compressor is out of step, if so, evaluating that the motor torque of the electric scroll compressor is qualified, and otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
Specifically, the compressor power corresponding to the step loss is obtained by the following formula:
and T is 9550 multiplied by P/n, wherein T is the recorded loading amount of the dynamometer, n is the recorded rotating speed of the motor of the compressor, and P is the corresponding compressor power when the step is out. And comparing the calculated compressor power with the rated power of the compressor, if the former is larger than the latter, indicating that the compressor is operated in the rated power, and the compressor cannot be out of step, namely, evaluating that the motor torque of the compressor is qualified, otherwise, evaluating that the motor torque of the compressor is not qualified.
In a supplementary embodiment of the present invention, the evaluation method further comprises evaluating a driving efficiency of the compressor motor by the following formula:
eta is P1/P0, wherein eta is the driving efficiency, P1 is the compressor power loaded by the dynamometer, and P0 is the actual input power of the compressor.
The specific evaluation method of the driving efficiency is that under the condition of a rated rotating speed and a certain dynamometer loading torque, the dynamometer loading power is obtained according to the formula T9550 multiplied by P/n, namely P1, and the actual compressor input power P0 is the product of the input voltage and the current of the driving circuit of the compressor measured under the same test condition.
The higher the drive efficiency, the better the evaluation, generally the drive efficiency at the rated speed should not be below 85%.
In another embodiment of the present invention, a system for testing motor torque of an electric scroll compressor is further provided, referring to fig. 3, the system includes an electric scroll compressor 1, a dynamometer 2 (preferably a magnetic powder dynamometer), a PC 3, a motor performance tester 4, and an electrical parameter measuring instrument 5, the electric scroll compressor 1 is reliably connected (so as to rotate synchronously) with the dynamometer 2 through a transmission shaft, the motor performance tester 4 is respectively connected with the PC 3 and the dynamometer 2, the motor performance tester 4 is used for controlling the loading amount of the dynamometer 2, the electrical parameter measuring instrument 5 is respectively connected with the electric scroll compressor 1 and the PC 3, and the electrical parameter measuring instrument 5 is used for measuring the input voltage and current of a driving circuit of the electric scroll compressor 1.
The connection mode is as follows: the motor performance tester is connected with the PC and the dynamometer through an RS-232 serial port communication line, the electrical parameter measuring instrument is connected with the PC through the RS-232 serial port communication line, and the PC is communicated with the electric scroll compressor CAN.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of evaluating motor torque of an electric scroll compressor, comprising:
connecting a motor rotor of the electric scroll compressor with a dynamometer to realize synchronous rotation;
controlling the dynamometer to load a preset loading amount, and adjusting the rotating speed of a compressor motor within a preset rotating speed range;
judging whether the compressor motor is out of step within a preset rotating speed range;
if the step-out phenomenon does not occur, increasing the loading capacity of the dynamometer and adjusting the rotating speed of the compressor motor until the step-out phenomenon occurs in the compressor motor, and if the step-out phenomenon does not occur in the whole preset rotating speed range, increasing the loading capacity of the dynamometer and repeating the preset rotating speed range for testing until the step-out occurs at a certain rotating speed point; recording the dynamometer motor loading capacity and the compressor motor rotating speed when the current motor is in a step-out state, if the actual torque of the compressor during actual work under the recorded motor rotating speed is less than the recorded dynamometer motor loading capacity, evaluating that the motor torque of the electric scroll compressor is qualified, and if not, evaluating that the motor torque of the electric scroll compressor is unqualified;
if the step loss phenomenon occurs, recording the current loading capacity of the dynamometer and the rotating speed of the motor of the compressor;
and if the actual torque of the compressor during actual working under the motor rotating speed recorded in the step-out process is smaller than the recorded dynamometer loading amount, evaluating that the motor torque of the electric scroll compressor is qualified, otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
2. The evaluation method according to claim 1, wherein the actual torque at which the compressor actually operates at the recorded motor speed is obtained by:
under the standard working condition, testing the actual input power of the compressor under the condition of the rotating speed of the motor;
the actual torque is obtained according to the following equation:
t is 9550 XP/n, wherein T is torque, P is compressor actual input power, and n is motor speed.
3. A method of evaluating motor torque of an electric scroll compressor, comprising:
connecting a motor rotor of the electric scroll compressor with a dynamometer to realize synchronous rotation;
controlling the dynamometer to load a preset loading amount, and adjusting the rotating speed of a compressor motor within a preset rotating speed range;
judging whether the compressor motor is out of step within a preset rotating speed range;
if the step-out phenomenon does not occur, increasing the loading capacity of the dynamometer and adjusting the rotating speed of the compressor motor until the step-out phenomenon occurs in the compressor motor, and if the step-out phenomenon does not occur in the whole preset rotating speed range, increasing the loading capacity of the dynamometer and repeating the preset rotating speed range for testing until the step-out occurs at a certain rotating speed point; recording the loading capacity of the dynamometer and the rotating speed of the motor of the compressor when the current motor is in a step-out state; judging whether the power of the corresponding compressor is larger than the rated power of the compressor when the compressor is out of step, if so, evaluating that the torque of the motor of the electric scroll compressor is qualified, and otherwise, evaluating that the torque of the motor of the electric scroll compressor is unqualified;
if the step loss phenomenon occurs, recording the current loading capacity of the dynamometer and the rotating speed of the motor of the compressor;
and judging whether the power of the corresponding compressor is larger than the rated power of the compressor when the compressor is out of step, if so, evaluating that the motor torque of the electric scroll compressor is qualified, and otherwise, evaluating that the motor torque of the electric scroll compressor is unqualified.
4. The evaluation method according to claim 3, wherein the compressor power corresponding to the out-of-step is obtained by the following formula:
and T is 9550 multiplied by P/n, wherein T is the recorded loading amount of the dynamometer, n is the recorded rotating speed of the motor of the compressor, and P is the corresponding compressor power when the step is out.
5. The evaluation method according to claim 1 or 3, further comprising evaluating a driving efficiency of the compressor motor by the following formula:
eta is P1/P0, wherein eta is the driving efficiency, P1 is the compressor power loaded by the dynamometer, and P0 is the actual input power of the compressor.
6. The evaluation method according to claim 5, wherein the compressor actual input power is obtained by:
measuring input voltage and current of a driving circuit of the compressor;
and calculating to obtain the actual input power of the compressor according to the input voltage and the input current of the driving circuit.
7. A test system for motor torque of an electric scroll compressor is characterized by comprising the electric scroll compressor, a dynamometer, a PC (personal computer), a motor performance tester and an electrical parameter measuring instrument, wherein a motor output shaft of the electric scroll compressor is connected with the dynamometer, the motor performance tester is respectively connected with the PC and the dynamometer, the motor performance tester is used for controlling the loading amount of the dynamometer, the electrical parameter measuring instrument is respectively connected with the electric scroll compressor and the PC, the electrical parameter measuring instrument is used for measuring the input voltage and current of a driving circuit of the electric scroll compressor, and the test system is used for executing the evaluation method according to any one of claims 1 to 6.
8. The test system of claim 7, wherein the dynamometer is a magnetic particle dynamometer.
9. The test system of claim 7, wherein the motor performance tester is connected with the PC and the dynamometer through an RS-232 serial communication line, the electrical parameter measuring instrument is connected with the PC through an RS-232 serial communication line, and the PC is in CAN communication with the electric scroll compressor.
10. The test system of claim 7, wherein the electric scroll compressor is securely connected to the dynamometer by a drive shaft for synchronous rotation.
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| CN102495367B (en) * | 2011-12-05 | 2013-09-11 | 奇瑞汽车股份有限公司 | Delivery test system and method for motor for pure electric vehicle |
| JP2016090540A (en) * | 2014-11-11 | 2016-05-23 | 株式会社ジェイテクト | Motor performance inspection device and inspection method using the same |
| CN104898059B (en) * | 2015-05-29 | 2017-09-26 | 中山明杰自动化科技有限公司 | A kind of permanent-magnet claw polar form stepper motor functional test full inspection machine |
| CN205593761U (en) * | 2016-05-13 | 2016-09-21 | 哈尔滨理工大学 | Intelligent electric automobile drive system test platform |
| CN106050638B (en) * | 2016-07-15 | 2018-10-26 | 珠海凌达压缩机有限公司 | A kind of appraisal procedure of compressor operating range |
| CN106374432B (en) * | 2016-09-14 | 2019-06-14 | 广州视源电子科技股份有限公司 | A kind of synchronous motor step failing out detecting method and its device |
| JP6838352B2 (en) * | 2016-10-28 | 2021-03-03 | コニカミノルタ株式会社 | Permanent magnet synchronous motor control device, control method, and image forming device |
| CN206862535U (en) * | 2016-11-22 | 2018-01-09 | 常州市鼎智机电有限公司 | Screw mandrel stepper motor torsion-testing apparatus |
| CN107272662B (en) * | 2017-07-27 | 2023-11-17 | 山东大学 | Driving motor and controller calibration system and calibration method for electric automobile |
| CN108199629A (en) * | 2017-12-21 | 2018-06-22 | 迈克医疗电子有限公司 | A kind of method for controlling stepping motor and device |
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Effective date of registration: 20220426 Address after: 215600 No.188, South Ring Road, Tangqiao town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: JIANGSU YINHE DIGITAL TECHNOLOGY CO.,LTD. Address before: 215634 No.208, International Auto City, Zhangjiagang Free Trade Zone, Suzhou City, Jiangsu Province (Yinhe Tongzhi) Patentee before: JIANGSU YINHE TONGZHI NEW ENERGY TECHNOLOGY CO.,LTD. |