CN102661812A - Method for improving temperature detection precision of motor winding - Google Patents
Method for improving temperature detection precision of motor winding Download PDFInfo
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- CN102661812A CN102661812A CN2012101513871A CN201210151387A CN102661812A CN 102661812 A CN102661812 A CN 102661812A CN 2012101513871 A CN2012101513871 A CN 2012101513871A CN 201210151387 A CN201210151387 A CN 201210151387A CN 102661812 A CN102661812 A CN 102661812A
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Abstract
The invention relates to a method for improving the temperature detection precision of a motor winding. The method comprises the following steps of: calculating resistance of the motor winding at a target calculation temperature, so as to obtain the temperature of the motor winding according to the nominal resistance of the motor winding at the zero temperature and a resistance temperature coefficient of a motor winding material, wherein the step of calculating the resistance of the motor winding at the target calculation temperature comprises the following substeps of: calculating or detecting direct current voltage output by a frequency converter to the motor winding; calculating or detecting direct current of the motor winding under the direct current voltage; and calculating the resistance of the motor winding at the target calculation temperature according to the determined direct current voltage and the determined direct current. According to the method, the influence of dead time of the frequency converter and the influence of the switch-on voltage drop of a power module on the resistance of the motor winding at the target calculation temperature are eliminated, and the precision of detecting the resistance of the motor winding at the target calculation temperature is greatly improved; and therefore, the precision of the temperature detection of the motor winding is effectively improved.
Description
Technical field
The present invention relates to a kind of method that improves the Electrimotor ' accuracy of detection.
Background technology
Electrimotor ' is an important indicator of design of electrical motor and operation, and its maximum temperature need be less than the temperature of its winding insulation grade regulation, to prevent to damage the motor windings insulating material in operational process for motor.General at present employing software algorithm detects Electrimotor '; The detection principle of software algorithm detected temperatures mainly is to utilize motor windings resistance size to have definite proportionate relationship with Electrimotor '; Also can be described as the temperature-coefficient of electrical resistance of motor winding material; The temperature variation of motor windings is calculated in the variation of the resistance through motor windings; Be specially: the power model (power model is generally IPM module or IGBT module) through frequency converter provides DC voltage to motor windings, detects the DC current under this DC voltage, can calculate the motor windings resistance under the target accounting temperature according to above-mentioned voltage and current value; In conjunction with the motor windings resistance of this temperature and the motor windings nominal resistance under the zero-temperature coefficient; The temperature-coefficient of electrical resistance that combines the motor windings material simultaneously just can calculate Electrimotor ', is the target accounting temperature.
Yet in the reality; For the upper and lower bridge arm of the power model that prevents frequency converter straight-through; " dead band " time of power model need be set; And power model itself also has conduction voltage drop; " dead band " time and conduction voltage drop all can cause frequency converter to fluctuate with the fluctuation of frequency converter busbar voltage to the actual output dc voltage of motor windings, can't be in steady state, thereby make the difference of transducer power module to the actual output dc voltage and the Theoretical Calculation output dc voltage of motor windings; This difference can influence the accuracy of detection of the motor windings resistance under the target accounting temperature, thereby causes that the accuracy of detection of Electrimotor ' is had considerable influence.
Summary of the invention
The technical matters that the present invention will solve provides a kind of method that improves the Electrimotor ' accuracy of detection; Effectively eliminated the influence of frequency converter Dead Time and power model conduction voltage drop to the motor windings resistance accuracy of detection under the target accounting temperature; Increase substantially the accuracy of detection of the motor windings resistance under the target accounting temperature, thereby effectively improved the accuracy of detection of Electrimotor '.
Technical scheme of the present invention is:
A kind of method that improves the Electrimotor ' accuracy of detection is applied to the system that power supply, frequency converter, motor are formed, and comprises the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', and wherein, the method for the motor windings resistance under the described calculating target accounting temperature is:
Calculate or detect the DC voltage of frequency converter to motor windings output;
Calculate or detect the DC current of motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
Target accounting temperature of the present invention is the actual value that finally calculates Electrimotor '.
A kind of method that improves the Electrimotor ' accuracy of detection is applied to the system that power supply, frequency converter, motor are formed, and comprises the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', and wherein, the method for the motor windings resistance under the described calculating target accounting temperature is:
Detect the frequency converter busbar voltage;
Frequency converter busbar voltage size based on detecting is confirmed frequency converter busbar voltage fluctuation range;
Divide a plurality of different voltages with different scopes based on frequency converter busbar voltage fluctuation range; And confirm that according to the center voltage of each different voltages with different scope frequency converter is to the dutycycle of motor windings output voltage in each voltage range; Guaranteeing that as far as possible in each voltage range frequency converter equates or near equating to the DC voltage of motor windings output, and according to this dutycycle of confirming to the motor windings output dc voltage;
Through the inverse proportion penalty coefficient frequency converter in each voltage range is carried out the inverse proportion compensation to the size variation of the DC voltage of motor windings output;
Calculate the DC voltage of frequency converter to motor windings output;
Detect and the DC current of definite motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
Frequency converter of the present invention is to the center voltage * dutycycle * inverse proportion penalty coefficient of DC voltage=each relevant voltage scope of motor windings output; Guaranteed that effectively frequency converter approaches steady state to the DC voltage of motor windings output, has effectively eliminated the influence to the motor windings resistance accuracy of detection under the target accounting temperature of frequency converter Dead Time and power model conduction voltage drop.
Preferably, the method for described detection frequency converter busbar voltage is: the intrinsic standoff ratio according to frequency converter bus sampled voltage AD value and predetermined frequency converter bus sampled voltage calculates the frequency converter busbar voltage.
Preferably, adopt the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage that the frequency converter busbar voltage is proofreaied and correct.
Preferably; Definite method of the intrinsic standoff ratio correction coefficient of described frequency converter bus sampled voltage is: to wiring board constant AC-input voltage is provided; Combine the ratio between frequency converter bus sampled voltage AD value and the constant AC-input voltage then, to obtain the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage.Further preferably; The definite of the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage of the present invention can carry out the FCT (english abbreviation of Functional Circuit Test at the frequency converter wiring board; Meaning functional test) time carries out, and the intrinsic standoff ratio correction coefficient that obtains frequency converter bus sampled voltage simultaneously is saved in power down and preserves in the device for future use in the frequency converter busbar voltage is proofreaied and correct.
Preferably, the division space of a plurality of different voltages with different scopes of described division can be about 5-15V, and concrete division can come to select according to the actual requirements.
Preferably, described inverse proportion penalty coefficient equals the center voltage of 1/ each relevant voltage scope, is used to eliminate in each voltage range that the center voltage difference owing to each voltage range causes frequency converter to the size variation of the DC voltage of motor windings output.
Preferably, described detection and definite motor windings are the DC current of having removed the current sample biasing AD value of motor windings when the frequency converter zero current is exported at the DC current under this DC voltage.Further preferably; The method of the current sample biasing AD value of described removal motor windings when the frequency converter zero current is exported is: detect the current sample biasing AD value of motor windings when the frequency converter zero current is exported in advance; Detect its current sample AD value under this DC voltage then; In conjunction with detecting the current sample biasing AD value and its current sample AD value under this DC voltage that obtains, to obtain the DC current of motor windings under this DC voltage.
Power model of the present invention is meant IPM module or IGBT module.
AD value of the present invention is meant the AD transformation result of single-chip microcomputer.
Principle of work of the present invention and advantage:
1, the present invention is provided with a plurality of different voltages with different scopes through the fluctuation range to frequency converter bus DC voltage; Confirm that according to the center voltage of each voltage range frequency converter is to the dutycycle of motor windings output voltage in each voltage range then; To guarantee in each voltage range as far as possible; Frequency converter equates or approaching equating to the DC voltage of motor windings output; Utilize the inverse proportion penalty coefficient that frequency converter in each voltage range is carried out the inverse proportion compensation to the size variation of the DC voltage of motor windings output then; Effectively eliminated the influence of frequency converter Dead Time and power model conduction voltage drop to the motor windings resistance accuracy of detection under the target accounting temperature; Though in each voltage range all with according to its separately the center voltage in the scope confirm that frequency converter is to the dutycycle of motor windings output voltage in each voltage range; But the micro-difference in the voltage range proves through a large amount of experiments the influence of Electrimotor ' precision fully can be received; The present invention through be provided with different voltage ranges and inverse proportion correction coefficient guarantee frequency converter to the DC voltage of motor windings output near steady state, increased substantially the accuracy of detection of the motor windings resistance under the target accounting temperature, because motor windings resistance size has definite proportionate relationship with winding temperature; Be the temperature-coefficient of electrical resistance of motor winding material, therefore promptly effectively improved the accuracy of detection of Electrimotor ' according to the invention significantly.
2, the present invention is the accuracy of detection that further improves Electrimotor '; Through detecting the current sample biasing AD value of motor windings under zero current in advance; Detect its current sample AD value under this DC voltage then; Through removing the current sample AD value under the zero current, obtain the DC current of motor windings under this DC voltage, the present invention eliminates its accuracy of detection influence to DC current through revising zero offset difference; Effectively improve the accuracy of detection of motor windings resistance, promptly improved the accuracy of detection of Electrimotor ' according to the invention.
3, the present invention is the accuracy of detection that further improves Electrimotor '; The present invention is through importing constant AC-input voltage to wiring board; Combine the ratio between frequency converter bus sampled voltage AD value and the constant AC-input voltage then; Obtain the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage; Intrinsic standoff ratio correction coefficient through frequency converter bus sampled voltage is proofreaied and correct the frequency converter busbar voltage, has improved the accuracy of detection of frequency converter busbar voltage, thereby has improved the accuracy of detection of Electrimotor ' according to the invention.
Description of drawings
Accompanying drawing 1 is a system chart of the present invention;
Accompanying drawing 2 is module diagrams of the motor windings resistance step under the embodiment of the invention 17 said calculating target accounting temperatures;
Embodiment
Embodiment 1, a kind of method that improves the Electrimotor ' accuracy of detection are applied to the system that power supply, frequency converter, motor are formed, and comprise the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', and wherein, the method for the motor windings resistance under the described calculating target accounting temperature is:
Calculate or detect the DC voltage of frequency converter to motor windings output;
Calculate or detect the DC current of motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
Embodiment 2, a kind of method that improves the Electrimotor ' accuracy of detection are applied to the system that power supply, frequency converter, motor are formed, and comprise the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', and wherein, the method for the motor windings resistance under the described calculating target accounting temperature is:
Detect the frequency converter busbar voltage;
Frequency converter busbar voltage size based on detecting is confirmed frequency converter busbar voltage fluctuation range;
Divide a plurality of different voltages with different scopes based on frequency converter busbar voltage fluctuation range; And confirm that according to the center voltage of each different voltages with different scope frequency converter is to the dutycycle of motor windings output voltage in each voltage range; Guaranteeing that as far as possible in each voltage range frequency converter equates or near equating to the DC voltage of motor windings output, and according to this dutycycle of confirming to the motor windings output dc voltage;
Through the inverse proportion penalty coefficient frequency converter in each voltage range is carried out the inverse proportion compensation to the size variation of the DC voltage of motor windings output;
Calculate the DC voltage of frequency converter to motor windings output;
Detect and the DC current of definite motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
Embodiment 3, a kind of method that improves the Electrimotor ' accuracy of detection; Wherein: the method for described detection frequency converter busbar voltage is: the intrinsic standoff ratio according to frequency converter bus sampled voltage AD value and predetermined frequency converter bus sampled voltage calculates the frequency converter busbar voltage, and all the other are with embodiment 1 or embodiment 2.
Embodiment 4, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: adopt the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage that the frequency converter busbar voltage is proofreaied and correct, all the other are with embodiment 3.
Embodiment 5, a kind of method that improves the Electrimotor ' accuracy of detection; Wherein: definite method of the intrinsic standoff ratio correction coefficient of described frequency converter bus sampled voltage is: to wiring board constant AC-input voltage is provided; Combine the ratio between frequency converter bus sampled voltage AD value and the constant AC-input voltage then; To obtain the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage, all the other are with embodiment 4.
Embodiment 6, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 2V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 7, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 4V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 8, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 5V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 9, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 6V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 10, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 8V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 11, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 10V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 12, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 12V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 13, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: the division space of a plurality of different voltages with different scopes of described division is about 15V, all the other are with any one embodiment among the embodiment 2-5.
Embodiment 14, a kind of method that improves the Electrimotor ' accuracy of detection, wherein: described inverse proportion penalty coefficient equals the center voltage of 1/ each relevant voltage scope, and all the other are with any one embodiment among the embodiment 2-13.
Embodiment 15, a kind of method that improves the Electrimotor ' accuracy of detection; Wherein: described detection and definite motor windings are the DC currents of having removed the current sample biasing AD value of motor windings when the frequency converter zero current is exported at the DC current under this DC voltage, and all the other are with any one embodiment among the embodiment 2-14.
Embodiment 16, a kind of method that improves the Electrimotor ' accuracy of detection; Wherein: described detection and definite motor windings comprise in the method for the DC current under this DC voltage: detect the current sample biasing AD value of frequency converter motor windings when zero current is exported in advance; Detect its current sample AD value under this DC voltage then; In conjunction with detecting the current sample biasing AD value and its current sample AD value under this DC voltage that obtains; To obtain the DC current of motor windings under this DC voltage, all the other are with embodiment 15.
Embodiment 17, a kind of method that improves the Electrimotor ' accuracy of detection are applied to the system that power supply, frequency converter, motor are formed, and comprise the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', and wherein: the method for the motor windings resistance under the described calculating target accounting temperature is:
Carry out the FCT (english abbreviation of Functional Circuit Test at the frequency converter wiring board; Mean functional test) time; To wiring board constant AC-input voltage is provided; Combine the ratio between frequency converter bus sampled voltage AD value and the constant AC-input voltage then, to obtain the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage;
Intrinsic standoff ratio according to frequency converter bus sampled voltage AD value and predetermined frequency converter bus sampled voltage calculates the frequency converter busbar voltage, and through the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage the frequency converter busbar voltage is proofreaied and correct;
Frequency converter busbar voltage size based on calculating is confirmed frequency converter busbar voltage fluctuation range;
Divide a plurality of different voltages with different scopes based on frequency converter busbar voltage fluctuation range; And confirm that according to the center voltage of each different voltages with different scope frequency converter is to the dutycycle of motor windings output voltage in each voltage range; Guaranteeing that as far as possible in each voltage range frequency converter equates or near equating to the DC voltage of motor windings output, and according to this dutycycle of confirming to the motor windings output dc voltage;
Through the inverse proportion penalty coefficient frequency converter in each voltage range is carried out the inverse proportion compensation to the size variation of the DC voltage of motor windings output, described inverse proportion penalty coefficient equals the center voltage of 1/ each relevant voltage scope;
Calculate the DC voltage of frequency converter to motor windings output, frequency converter is to the center voltage * dutycycle * inverse proportion penalty coefficient of DC voltage=each relevant voltage scope of motor windings output;
Detect the current sample biasing AD value of frequency converter motor windings when zero current is exported in advance; Detect its current sample AD value under this DC voltage then; In conjunction with detecting the current sample biasing AD value and its current sample AD value under this DC voltage that obtains, to obtain the DC current of motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating, all the other are with any one embodiment among the embodiment 2-16.
The concrete operations sequence of steps of the motor windings resistance under the present embodiment 17 described calculating target accounting temperatures can be according to shown in this Figure of description 2.
Because the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage of the present invention is a proportionate relationship with the frequency converter busbar voltage that detection without overcorrect obtains; Therefore the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage does not have concrete restriction as long as before the motor windings resistance step under calculating the target accounting temperature frequency converter busbar voltage is proofreaied and correct for concrete correction in proper order.
Same principle; Because inverse proportion penalty coefficient of the present invention is used for the correction of the DC voltage of motor windings; Therefore the inverse proportion penalty coefficient does not have concrete restriction as long as before the DC voltage step of confirming motor windings, proofread and correct for concrete correction in proper order.
The above only is a preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the principle of the invention, to the present invention make some improvement and the retouching also should be regarded as protection scope of the present invention.
Claims (8)
1. method that improves the Electrimotor ' accuracy of detection is applied to the system that power supply, frequency converter, motor are formed, and comprises the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', it is characterized in that: the method for the motor windings resistance under the described calculating target accounting temperature is:
Calculate or detect the DC voltage of frequency converter to motor windings output;
Calculate or detect the DC current of motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
2. method that improves the Electrimotor ' accuracy of detection is applied to the system that power supply, frequency converter, motor are formed, and comprises the motor windings resistance that calculates under the target accounting temperature; Temperature-coefficient of electrical resistance based on motor windings nominal resistance under the zero-temperature coefficient and motor winding material obtains Electrimotor ', it is characterized in that: the method for the motor windings resistance under the described calculating target accounting temperature is:
Detect the frequency converter busbar voltage;
Frequency converter busbar voltage size based on detecting is confirmed frequency converter busbar voltage fluctuation range;
Divide a plurality of different voltages with different scopes based on frequency converter busbar voltage fluctuation range; And confirm that according to the center voltage of each different voltages with different scope frequency converter is to the dutycycle of motor windings output voltage in each voltage range; Guaranteeing that as far as possible in each voltage range frequency converter equates or near equating to the DC voltage of motor windings output, and according to this dutycycle of confirming to the motor windings output dc voltage;
Through the inverse proportion penalty coefficient frequency converter in each voltage range is carried out the inverse proportion compensation to the size variation of the DC voltage of motor windings output;
Calculate the DC voltage of frequency converter to motor windings output;
Detect and the DC current of definite motor windings under this DC voltage;
Obtain the motor windings resistance under the target accounting temperature according to DC voltage of confirming and DC current calculating.
3. according to claim 1 or claim 2 a kind of method that improves the Electrimotor ' accuracy of detection, it is characterized in that: the method for described detection frequency converter busbar voltage is: the intrinsic standoff ratio according to frequency converter bus sampled voltage AD value and predetermined frequency converter bus sampled voltage calculates the frequency converter busbar voltage.
4. a kind of method that improves the Electrimotor ' accuracy of detection as claimed in claim 3 is characterized in that:
Adopt the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage that the frequency converter busbar voltage is proofreaied and correct.
5. a kind of method that improves the Electrimotor ' accuracy of detection as claimed in claim 4 is characterized in that:
Definite method of the intrinsic standoff ratio correction coefficient of described frequency converter bus sampled voltage is: to wiring board constant AC-input voltage is provided; Combine the ratio between frequency converter bus sampled voltage AD value and the constant AC-input voltage then, to obtain the intrinsic standoff ratio correction coefficient of frequency converter bus sampled voltage.
6. a kind of method that improves the Electrimotor ' accuracy of detection as claimed in claim 2 is characterized in that:
The division space of a plurality of different voltages with different scopes of described division can be about 5-15V.
7. a kind of method that improves the Electrimotor ' accuracy of detection as claimed in claim 2 is characterized in that:
Described inverse proportion penalty coefficient equals the center voltage of 1/ each relevant voltage scope.
8. a kind of method that improves the Electrimotor ' accuracy of detection as claimed in claim 2 is characterized in that:
Described detection and definite motor windings are the DC current of having removed the current sample biasing AD value of motor windings when the frequency converter zero current is exported at the DC current under this DC voltage.
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| CN2012101513871A CN102661812A (en) | 2012-05-15 | 2012-05-15 | Method for improving temperature detection precision of motor winding |
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| CN2012101513871A CN102661812A (en) | 2012-05-15 | 2012-05-15 | Method for improving temperature detection precision of motor winding |
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| CN104316770A (en) * | 2014-10-27 | 2015-01-28 | 展鹏科技股份有限公司 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
| CN104483041A (en) * | 2014-12-25 | 2015-04-01 | 珠海格力电器股份有限公司 | Temperature rise measurement method and device of coil winding |
| CN107390740A (en) * | 2017-07-26 | 2017-11-24 | 珠海格力电器股份有限公司 | heating apparatus control method and device |
| CN109757125A (en) * | 2016-12-23 | 2019-05-14 | 翰昂汽车零部件有限公司 | Utilize the brshless DC motor driving method and device of voltage compensation |
| CN118130889A (en) * | 2024-05-08 | 2024-06-04 | 山东艾克索仑电气有限公司 | Current detection device and method for alternating current frequency converter |
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| CN103267587A (en) * | 2013-03-18 | 2013-08-28 | 国电南瑞科技股份有限公司 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
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| CN104316770A (en) * | 2014-10-27 | 2015-01-28 | 展鹏科技股份有限公司 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
| CN104483041A (en) * | 2014-12-25 | 2015-04-01 | 珠海格力电器股份有限公司 | Temperature rise measurement method and device of coil winding |
| CN109757125A (en) * | 2016-12-23 | 2019-05-14 | 翰昂汽车零部件有限公司 | Utilize the brshless DC motor driving method and device of voltage compensation |
| CN107390740A (en) * | 2017-07-26 | 2017-11-24 | 珠海格力电器股份有限公司 | heating apparatus control method and device |
| CN118130889A (en) * | 2024-05-08 | 2024-06-04 | 山东艾克索仑电气有限公司 | Current detection device and method for alternating current frequency converter |
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Application publication date: 20120912 |