CN102810850A - Method for protecting overload running of electric motor - Google Patents
Method for protecting overload running of electric motor Download PDFInfo
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- CN102810850A CN102810850A CN2011101439099A CN201110143909A CN102810850A CN 102810850 A CN102810850 A CN 102810850A CN 2011101439099 A CN2011101439099 A CN 2011101439099A CN 201110143909 A CN201110143909 A CN 201110143909A CN 102810850 A CN102810850 A CN 102810850A
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Abstract
The invention provides a method for protecting the overload running of an electric motor. The method comprises the following steps of collecting the current of the electric motor in real time, calculating a current integration value per average period, comparing the current integration value with a set first current threshold value, determining whether the electric motor is overloaded or not, reducing an overload coefficient if overload happens, enabling the current integration value to be less than or equal to a set second current threshold value, and enabling the current integration value of the electric motor to be kept between the first threshold value and the second threshold value through overload recovery. According to the method provided by the invention, the electric motor can be effectively prevented from overloading, and the method is practical for an electric vehicle in running.
Description
Technical field
The present invention relates to a kind of guard method of motor operating overload, the motor of particularly a kind of electric automobile and hybrid vehicle is used to protect a kind of control method of motor when overload takes place in running.
Background technology
At present, motor vehicle and motor vehicle driven by mixed power have begun playing the part of more and more important role, and motor is the important motivity source on motor vehicle and the motor vehicle driven by mixed power, and therefore, it is particularly important that the fail safe of motor and reliability seem.
Overload appears in motor easily in running; Overload occurring then can make the operating current of motor very big; If the electric current during the motor operation is greater than the rated operational current of motor, long-play can cause the motor fuselage overheated, and the temperature rise of motor internal is too fast; Can destroy the insulation of winding if temperature is too high, thereby cause the permanent damages of motor.
At present, a kind of mode that is used to protect motor overload is broken off motor power protection motor for adopting the mechanical type overload relay after detecting overload; Thereby another kind method is to improve the heat-sinking capability raising overload capacity of motor through heat abstractor.But all there is defective in these two kinds of methods: will stop the motor operation after the first method overload, the electric motor car in going and inapplicable; Second method increases heat abstractor can take vehicle space, and increases cost.
Summary of the invention
Increase problem in order to solve the prior motor overload protection method through the cut off the electricity supply impracticability brought and the cost that brings through heat abstractor of switch; The present invention provides a kind of motor overload guard method; Can effectively prevent motor overload; Have practicality for electric automobile in going and hybrid vehicle, and can reduce cost.
The present invention provides a kind of motor overload operation protection method, and this method comprises:
A, gather the electric current of motor in real time, calculate the current integration value in average each integration period;
B, the said current integration value and first current threshold are compared; When said current integration value during more than or equal to first current threshold; Reduce overload factor; Motor is moved relevant input variable multiply by said overload factor and obtain new input variable, be less than or equal to second current threshold up to said current integration value.
Further, said motor overload operation protection method also comprises:
C, be less than or equal to second current threshold when said current integration value, increase overload factor, again motor is moved relevant input variable and multiply by said overload factor and obtain new input variable, motor is moved under the condition of new input variable.
Further, the method for the current integration value in average each integration period of said calculating comprises: calculate the current integration value in a period of time, calculate the current integration value in average each cycle in said a period of time again.
Further, said first current threshold is to the normal resulting integrated value of moving of limiting current integration of motor in an integration period.
Further, said second current threshold is 0.85-0.95 times of said first current threshold.
Further, said overload factor is more than or equal to 0 and be less than or equal to 1, and initial value is 1.
Further, said step b also comprises: when said current integration value during less than first current threshold, judge that then motor normally moves, keep overload factor constant.
Further, said motor overload operation protection method also comprises:
D, detect motor temperature in real time; When surpassing the maximum temperature value of the normal operation of motor, motor temperature reduces first current threshold and second current threshold when detecting; And keep the difference of first current threshold and second current threshold constant; When said motor temperature returns to said maximum temperature value when following, recover said first current threshold and second current threshold.
Further, the collection of said current of electric, the dsp controller that more all adopts of the computing of current integration value and current integration value and first current threshold and second current threshold is realized.
Further, said is electric current, voltage or the power that inputs to motor stator winding with the relevant input variable of motor operation.
The present invention is through setting first current threshold and second current threshold; When taking place, overload make the current integration value of motor remain between first current threshold and second current threshold through regulating overload factor; Effectively prevent motor overload; And do not rely on hardware switch and heat abstractor, reduced cost, be applicable to operating electric automobile and hybrid vehicle.
Description of drawings
The flow chart of a kind of motor overload operation protection method that accompanying drawing 1 provides for the embodiment of the invention.
The temperature control flow figure of a kind of motor overload operation protection method that accompanying drawing 2 provides for the embodiment of the invention.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the present invention is solved, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Shown in accompanying drawing 1, a kind of motor overload operation protection method, this method comprises:
A, gather the electric current of motor in real time, calculate the current integration value in average each integration period;
B, the said current integration value and first current threshold are compared; When said current integration value during more than or equal to first current threshold; Reduce overload factor; Motor is moved relevant input variable multiply by said overload factor and obtain new input variable, be less than or equal to second current threshold up to said current integration value.
Wherein, Step a detects the electric current of motor in real time; Because the cycle of motor three-phase current can be along with the rotating speed of motor real-time change; Therefore be preferably the current integration value of calculating earlier in a period of time, calculate the current integration value in interior during this period of time average each integration period again, the cycle of the three-phase current when integration period is the motor operation.
Step b judges at first whether motor transships; Current integration value that calculates and predefined first current threshold are compared, first current threshold be in an integration period to the integrated value of the limiting current integration gained of the normal operation of motor, limiting current is the maximum current of the normal operation of motor; Overstep the extreme limit electric current then motor transship; The limiting current value is by the overload capacity decision of motor, different motor, overload capacity difference.If the current integration value more than or equal to first current threshold, then is judged as motor overload, periodically reduce overload factor.Because control program is carried out according to fixed frequency, all functions are carried out according to loop cycle, and this is that those skilled in the art is known.So overload factor is according to fixing frequency change in a control system, the decrease speed of overload factor and amplitude are specifically confirmed according to control system, different control systems, and the adjusting of overload factor also can be different; The initial value of overload factor is 1; Overload factor is more than or equal to 0 and be less than or equal to 1; The overload factor of this moment and the input variable (inputing to electric current, voltage or the power of the stator winding of motor) of control are multiplied each other; Obtain new input variable, detect again this moment the current integration value and with first current threshold relatively, be less than or equal to second current threshold up to the current integration value.
Preferably, step b also comprises: when electric machine controller detects the current integration value less than first current threshold, judge that then motor normally moves, keep overload factor 1 constant.
Further, a kind of motor overload operation protection method of providing of present embodiment also comprises:
C, be less than or equal to second current threshold when said current integration value, increase overload factor, again motor is moved relevant input variable and multiply by said overload factor and obtain new input variable, motor is moved under the condition of new input variable.
Step c, then periodically increases overload factor when the current integration value is less than or equal to second current threshold for the overload recovery stage, and up to increasing to 1, the resume speed of overload factor and amplitude are specifically confirmed according to control system; Simultaneously motor being moved relevant input variable multiply by overload factor and obtains new input variable; Motor is moved under new input variable condition; Second current threshold is 0.85-0.95 times of first current threshold, preferably, and set second current threshold and be first current threshold 0.9 times.If only set first current threshold, recover overload factor after less than first current threshold electric current is gone up when detecting the current integration value, again overload situations can appear then in very short time; So repeatedly; Can make system be in overload always and recover with overload, then vibration appears in the electric current of motor, and therefore second current threshold is set; Making between overload and the overload recovery has certain current buffering district, prevents that vibration from appearring in electric current.
Present embodiment at first detects the motor three-phase current and calculates the current integration value in average each cycle; Compare with first current threshold of setting; If the current integration value is more than or equal to first current threshold then judge motor overload, if the current integration value is less than first current threshold then judge the normal operation of motor and keep overload factor constant.If motor overload makes the current integration value be less than or equal to second current threshold of setting through reducing the relevant input variable of overload factor reduction; Then transship recovery when the current integration value is less than or equal to second current threshold, the current effective value of motor is remained between first current threshold and second current threshold.
Because factors such as ambient temperature and radiating condition can influence radiation effect of motor, in the machine operation process, will monitor the temperature of motor in real time, so the motor overload operation protection method comprise also:
D, detect motor temperature in real time; When surpassing the maximum temperature value of the normal operation of motor, motor temperature reduces first current threshold and second current threshold when detecting; And keep the difference of first current threshold and second current threshold constant; When said motor temperature returns to said maximum temperature value when following, recover said first current threshold and second current threshold.
Shown in accompanying drawing 2, electric machine controller is gathered the temperature of motor in real time, and compares with the normal maximum temperature value of moving of motor; When detecting motor temperature and surpass the maximum temperature of the normal operation of motor; Reduce by first current threshold and second current threshold synchronously, and keep the interval constant of first current threshold and second current threshold, like this; After being checked through motor overload, can make machine operation below the first lower current threshold, prevent that the temperature of motor from further raising; When motor temperature returns to the maximum temperature value of the normal operation of motor when following, recover first current threshold and second current threshold more synchronously.
Preferably, adopt the high dsp controller of fast operation, real-time to gather current of electric in the present embodiment, calculate the current integration value in average each cycle, and the comparison that realizes current integration value and first current threshold and second current threshold.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a motor overload operation protection method is characterized in that, this method comprises:
A, gather the electric current of motor in real time, calculate the current integration value in average each integration period;
B, the said current integration value and first current threshold are compared; When said current integration value during more than or equal to first current threshold; Reduce overload factor; Simultaneously motor is moved relevant input variable and multiply by said overload factor and obtain new input variable, be less than or equal to second current threshold up to said current integration value.
2. motor overload operation protection method according to claim 1 is characterized in that, said method also comprises:
C, be less than or equal to second current threshold when said current integration value, increase overload factor, simultaneously motor is moved relevant input variable and multiply by said overload factor and obtain new input variable, motor is moved under the condition of new input variable.
3. motor overload operation protection method according to claim 1; It is characterized in that; The method of the current integration value in average each integration period of said calculating comprises: calculate the current integration value in a period of time, calculate the current integration value in average each cycle in said a period of time again.
4. motor overload operation protection method according to claim 1 is characterized in that, said first current threshold is to the normal resulting integrated value of moving of limiting current integration of motor in an integration period.
5. motor overload operation protection method according to claim 4 is characterized in that, said second current threshold is 0.85-0.95 times of said first current threshold.
6. motor overload operation protection method according to claim 1 is characterized in that, said overload factor is more than or equal to 0 and be less than or equal to 1, and initial value is 1.
7. motor overload operation protection method according to claim 1 is characterized in that, said step b also comprises: when said current integration value during less than first current threshold, judge that motor normally moves, keep overload factor constant.
8. motor overload operation protection method according to claim 1 is characterized in that, said motor overload operation protection method also comprises:
D, detect motor temperature in real time, reduce first current threshold and second current threshold when detecting when motor temperature surpasses the maximum temperature value of the normal operation of motor, and keep the difference of first current threshold and second current threshold constant; When said motor temperature returns to said maximum temperature value when following, recover said first current threshold and second current threshold.
9. according to the described motor overload operation protection method of any claim in the claim 1-8; It is characterized in that the dsp controller that more all adopts of the computing of the collection of said current of electric, current integration value and current integration value and first current threshold and second current threshold is realized.
10. according to the described motor overload operation protection method of any claim in the claim 1-8, it is characterized in that said is electric current, voltage or the power that inputs to motor stator winding with the relevant input variable of motor operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110143909.9A CN102810850B (en) | 2011-05-31 | 2011-05-31 | A kind of motor overload operation protection method |
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| CN201110143909.9A CN102810850B (en) | 2011-05-31 | 2011-05-31 | A kind of motor overload operation protection method |
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| CN102810850A true CN102810850A (en) | 2012-12-05 |
| CN102810850B CN102810850B (en) | 2015-08-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034736A (en) * | 2014-05-27 | 2014-09-10 | 楚天科技股份有限公司 | Method for detecting breaking of light examining machine rotation bottle belt |
| CN104092188A (en) * | 2014-07-30 | 2014-10-08 | 长城汽车股份有限公司 | Motor control method |
| CN110995117A (en) * | 2019-12-13 | 2020-04-10 | 中国科学院深圳先进技术研究院 | Motor function safety control method and device |
| CN112904113A (en) * | 2021-01-19 | 2021-06-04 | 深圳市海浦蒙特科技有限公司 | Method and device for detecting overload of brake resistor |
| CN117559878A (en) * | 2024-01-12 | 2024-02-13 | 深圳市好盈科技股份有限公司 | Current control method and device of model airplane electronic speed regulator and electronic equipment |
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| CN101136608A (en) * | 2006-08-29 | 2008-03-05 | 大隈株式会社 | Mit motorschutzfunktion ausgestattete steuerungsvorrichtung |
| CN101777754A (en) * | 2009-01-09 | 2010-07-14 | 比亚迪股份有限公司 | Overload operation protection method for motor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034736A (en) * | 2014-05-27 | 2014-09-10 | 楚天科技股份有限公司 | Method for detecting breaking of light examining machine rotation bottle belt |
| CN104092188A (en) * | 2014-07-30 | 2014-10-08 | 长城汽车股份有限公司 | Motor control method |
| CN104092188B (en) * | 2014-07-30 | 2018-01-02 | 长城汽车股份有限公司 | motor control method |
| CN110995117A (en) * | 2019-12-13 | 2020-04-10 | 中国科学院深圳先进技术研究院 | Motor function safety control method and device |
| CN110995117B (en) * | 2019-12-13 | 2021-04-16 | 中国科学院深圳先进技术研究院 | Motor function safety control method and device |
| CN112904113A (en) * | 2021-01-19 | 2021-06-04 | 深圳市海浦蒙特科技有限公司 | Method and device for detecting overload of brake resistor |
| CN112904113B (en) * | 2021-01-19 | 2022-09-20 | 深圳市海浦蒙特科技有限公司 | Method and device for detecting overload of brake resistor |
| CN117559878A (en) * | 2024-01-12 | 2024-02-13 | 深圳市好盈科技股份有限公司 | Current control method and device of model airplane electronic speed regulator and electronic equipment |
| CN117559878B (en) * | 2024-01-12 | 2024-03-29 | 深圳市好盈科技股份有限公司 | Current control method and device of model airplane electronic speed regulator and electronic equipment |
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| CN102810850B (en) | 2015-08-26 |
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