CN202014219U - Direct-current brushless fan motor driver and air conditioner adopting driver - Google Patents
Direct-current brushless fan motor driver and air conditioner adopting driver Download PDFInfo
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- CN202014219U CN202014219U CN2010206991310U CN201020699131U CN202014219U CN 202014219 U CN202014219 U CN 202014219U CN 2010206991310 U CN2010206991310 U CN 2010206991310U CN 201020699131 U CN201020699131 U CN 201020699131U CN 202014219 U CN202014219 U CN 202014219U
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Abstract
The utility model discloses a direct-current brushless fan motor driver and an air conditioner adopting the driver. The driver comprises a control module, a three-phase inverter, a current detection module and a power supply module, wherein the three-phase inverter receives a direct-current bus voltage outputted by the power supply module as well as inverts the direct-current bus voltage to a three-phase alternating-current voltage and outputs the three-phase alternating-current voltage to the direct-current brushless fan motor under the control of a switching control signal sent from the control module; current outputted through a source electrode of a lower bridge arm IGBT (insulated gate bipolar transistor) of the three-phase inverter is transmitted to the current detection module and then is fed back to the control module through the processing of the detection module. In the utility model, the driver arranged outside the direct-current brushless fan motor is used for controlling the running of the motor to accurately control the motor revolving speed, so that rotor position sensor is not needed, and the hardware cost is lowered. When the direct-current brushless fan motor driver is applied to the air-conditioning system, the working environment of the driver can be improved, and the overall cost of the air conditioner product can be reduced.
Description
Technical field
The utility model belongs to fan electromotor drive system technical field, specifically, relates to a kind of air conditioner of controlling the driving governor of brush DC fan motor rotational speed and adopting described brush DC fan electromotor design of Driver of being used to.
Background technology
The present brush DC fan electromotor that uses on the air-conditioning system brush DC fan electromotor of driver that has been built-in mostly, that is to say that this fan electromotor need be built into motor internal with driver, and adopt rotor-position sensor accurately to control the rotating speed of brush DC fan electromotor, not only increased the technical difficulty of producing this motor thus, and because air-conditioner outdoor unit is exposed to outdoor throughout the year, running environment is more abominable, this also causes the operational environment of fan electromotor inner drive abominable relatively, and general motor producer is difficult to possess this technical merit.Therefore, the production technology of present this brush DC fan electromotor is many to be controlled by Japanese enterprises, and domestic air conditioner production firm needs this motor application of import in the air-conditioning product of oneself, causes the rising of hardware cost thus.
Based on this, how to design a kind of technology driver simple, with low cost, to be applicable to drive controlling, be the subject matter that present air conditioner production firm needs to be resolved hurrily to the brush DC fan electromotor.
The utility model content
The utility model at existing brush DC fan electromotor owing to the built-in problem that the production technology difficulty is big, cost is high that causes of driver, a kind of driver that is placed on the brush DC fan electromotor has been proposed, to reduce design difficulty, improve the operational environment of motor driver.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of brush DC fan electromotor driver comprises control module, three-phase inverter, current detection module and the power module of working power is provided for each module; Described three-phase inverter receives the DC bus-bar voltage of power module output, and under the control action of the switch controlling signal that control module is sent, DC bus-bar voltage is reverse into three-phase alternating voltage exports the brush DC fan electromotor to; The current delivery of the source electrode output by brachium pontis IGBT under the described three-phase inverter feeds back to described control module to described current detection module after current detection module is handled.
Further, in described current detection module, include two phase current detecting units, respectively in the inverter wherein under the two-way electric current of the source electrode of brachium pontis IGBT output carry out sample detecting; In each phase current detecting unit, all include one road integrated transporting discharging, its in-phase input end connects wherein the source electrode of brachium pontis IGBT under a tunnel by current sampling resistor, its inverting input connects power supply ground, the output that connects integrated transporting discharging simultaneously constitutes negative feedback network, the in-phase input end of integrated transporting discharging and inverting input are formed differential amplifier circuit jointly, by high speed integrated transporting discharging output be used to reflect that the voltage signal of sample rate current feeds back to described control module.
Further again, on the in-phase input end of described integrated transporting discharging, also be connected with resistance pressure-dividing network, the bias voltage of exporting by the dividing potential drop node of resistance pressure-dividing network is applied on the in-phase input end of described integrated transporting discharging.
Further again, in described feedback network, include two divider resistances at least, the inverting input of described integrated transporting discharging connects the output of described integrated transporting discharging on the other hand on the one hand by one road divider resistance ground connection by other one road divider resistance.
Preferably; in described current detection module, also be provided with a bus current detecting unit; comprise the sample circuit that is used to gather bus current; the bus current that collects is converted to the in-phase input end that sampled voltage exports one road integrated transporting discharging to; the inverting input of described integrated transporting discharging connects the output of integrated transporting discharging by feedback circuit; by the output of described integrated transporting discharging be used to reflect that the voltage signal of bus current size exports a comparator to; after reference voltage by comparator and setting compared, the output overcurrent guard signal fed back to described control module.
Further, in described sample circuit, comprise four road current sampling resistors, wherein three the tunnel be connected in the inverter between the in-phase input end of the source electrode of brachium pontis IGBT under three tunnel and described integrated transporting discharging, other one road current sampling resistor is connected between the in-phase input end and power supply ground of described integrated transporting discharging, be used for three road current sampling datas are superposeed, to generate the pairing sample voltage value of current bus current.
Further again, described control module connected storage is transferred information such as the speed setting value of brush DC fan electromotor and the parameter of electric machine from memory.
Preferably, described memory preferably adopts EEPROM, passes through I
2The C bus is connected communication with control module.
Further, described control module is a single-chip microcomputer; Described inverter preferably adopts Intelligent Power Module IPM to finish from DC bus-bar voltage to driving the inversion process that the brush DC fan electromotor moves required three-phase alternating-current supply.
Project organization based on above-mentioned brush DC fan electromotor driver, the utility model provides a kind of air conditioner that adopts described brush DC fan electromotor design of Driver again, comprise indoor set and off-premises station, in described off-premises station, be provided with the brush DC fan electromotor, be used to drive the driver of its operation being externally connected to of described fan electromotor, in described driver, be provided with control module, three-phase inverter, current detection module and the power module of working power is provided for each module; Described three-phase inverter receives the DC bus-bar voltage of power module output, and under the control action of the switch controlling signal that control module is sent, DC bus-bar voltage is reverse into three-phase alternating voltage exports the brush DC fan electromotor to; The current delivery of the source electrode output by brachium pontis IGBT under the described three-phase inverter feeds back to described control module to described current detection module after current detection module is handled.Described control module can be judged the current rotating speed of brush DC fan electromotor according to the detection signal of current detection module feedback, and then control three-phase inverter driving brush DC fan electromotor operates on the desired setting rotating speed.
Compared with prior art, advantage of the present utility model and good effect are: the utility model adopts the driver that is arranged at brush DC fan electromotor outside to control the operation of brush DC fan electromotor, not only can accurately control the rotating speed of fan electromotor, make its speed error scope be limited to ± 5 change in, and need not to be provided with rotor-position sensor, reduced hardware cost.It is applied in the air-conditioning system, when guaranteeing the air conditioner service behaviour, can improves the operational environment of driver, reduce the complete machine cost of air-conditioning product.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the brush DC fan electromotor driver that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of control module among Fig. 1;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of three-phase inverter and current detection module among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Embodiment one, and present embodiment is that example describes with the air-conditioning product.In order to realize drive controlling to the brush DC fan electromotor, present embodiment is at the external Design driver of brush DC fan electromotor, when finishing to the fan electromotor drive controlling, reduce the design difficulty of fan electromotor, break away from the present situation of air-conditioning product dependence on import fan electromotor, reduce the hardware cost of product.
The brush DC fan electromotor driver of present embodiment mainly partly is made up of power module, control module, three-phase inverter, current detection module etc., referring to shown in Figure 1.Wherein, power module is each electricity consumption electric in the driver; Control module output is used for controlling the switch controlling signal of each switching device break-make of three-phase inverter, and then the control three-phase inverter is reverse into the required three-phase alternating voltage output of back level brush DC fan electromotor operation with the DC bus-bar voltage of power module output, to drive the brush DC fan running.In order to reach accurate control to the brush DC fan motor rotational speed, the position transducer that present embodiment adopts current detection module to replace tradition to be built in fan electromotor comes the current rotating speed of fan electromotor is detected, be connected between the source electrode and control module of following brachium pontis I GBT of three-phase inverter, with sample detecting to three-phase inverter in down the current value of the source electrode output of brachium pontis IGBT feed back to control module, utilize revolution speed calculating method in the control module to calculate the rotating speed of current brush DC fan electromotor, and compare with speed setting value, duty ratio with the switch controlling signal of the PWM form of determining its output, and then the break-make sequential of each switching device in the adjusting three-phase inverter, change the three-phase alternating current driving power that it exports the brush DC fan electromotor to, the final adjusting that realizes the brush DC fan motor rotational speed, its rotating speed can be stabilized on the predefined tachometer value, reach accurate control the brush DC fan motor rotational speed.
Can be pre-written in the memory that is connected with described control module for information such as speed setting value, the controlled parameter of electric machine (such as the resistance of winding in the motor, D axle, Q axle inductance value etc.), program control parameter, protection parameters, read when program running for control module and calls.As a kind of preferred design of present embodiment, described memory can adopt an EEPROM to come save routine required various parameter informations of when operation, passes through I
2The C bus realizes the communication that is connected with control module, in conjunction with Fig. 1, shown in Figure 2.
Fig. 2 is a kind of physical circuit design of described control module, can adopt a single-chip microcomputer IC01 to cooperate simple periphery circuit design to realize.Wherein, single-chip microcomputer IC01 is by its 6 road I/O mouth, such as 18～23 pin, output switch control signal UP, UN, VP, VN, WP, WN, corresponding respectively three pairs of switching devices that transfer in the three-phase inverter are such as the grid of three couples of IGBT, with the break-make sequential of control IGBT.In the present embodiment, described switch controlling signal UP, UN, VP, VN, WP, WN are preferably pwm signal, realize accurate control to 6 road IGBT break-make sequential by the duty ratio of regulating pwm signal.
Fig. 3 is a kind of preferred circuit design principle figure of three-phase inverter and current detection module, wherein, three-phase inverter can adopt an Intelligent Power Module IPM to realize, receive the switch controlling signal UP of single-chip microcomputer IC01 output, UN, VP, VN, WP, the DC bus-bar voltage of WN and power module output, such as+310V, specifically can insert described DC bus-bar voltage+310V by the P pin of IPM, and then at switch controlling signal UP, UN, VP, VN, WP, under the break-make control action of WN, DC bus-bar voltage+310V is reverse into three-phase alternating voltage, by its U, V, the W pin exports the brush DC fan electromotor to, drives its operation.
For the rotating speed of brush DC fan electromotor is accurately controlled, present embodiment has designed two phase current detecting units in current detection module, respectively among the three-phase inverter IPM wherein under the two-way electric current of the source electrode of brachium pontis IGBT output carry out sample detecting.As shown in Figure 3, present embodiment is that example describes with detection U phase, V phase two-way electric current.In each phase current detecting unit, all include one road integrated transporting discharging U2, U3, wherein, the in-phase input end of integrated transporting discharging U2 connects the source electrode NU of the following brachium pontis IGBT of U phase by current sampling resistor R12, and by current sampling resistor R32 connection power supply ground, its inverting input connects power supply ground, the output that connects integrated transporting discharging U2 simultaneously constitutes negative feedback network, the in-phase input end of integrated transporting discharging U2 and inverting input are formed differential amplifier circuit jointly, can reflect the voltage signal IU_AD of the size of current of U phase by integrated transporting discharging U2 output, and then feed back to the calculating that single-chip microcomputer IC01 is used for motor speed.
The phase current detecting unit of present embodiment is connected in series high-power, high-precision noninductive resistance R32 between source electrode and the power supply ground by brachium pontis IGBT under inverter, and dividing potential drop changes the variation that characterizes phase current on this resistance R 32 by detecting.In addition, integrated operational amplifier circuit adopts difference to amplify mode, can effectively suppress common mode disturbances.
In the present embodiment, the in-phase input end of described integrated transporting discharging U2 also is connected with resistance pressure-dividing network simultaneously, as shown in Figure 3, specifically can be formed by connecting by divider resistance R03, R04 and DC power supply AVDD, dividing potential drop node output offset voltage by resistance pressure-dividing network, be applied on the in-phase input end of described integrated transporting discharging U2, for the sampled voltage that obtains by current sampling resistor R12 provides bias voltage.
Between the inverting input of described integrated transporting discharging U2 and output, be connected with feedback network, can specifically adopt divider resistance R01, R02 and R11 to be formed by connecting, as shown in Figure 3.Wherein, be connected across after divider resistance R01, the R02 parallel connection between the output and inverting input of integrated transporting discharging U2, the inverting input of integrated transporting discharging U2 connects power supply ground by divider resistance R11 simultaneously.The voltage signal of handling back output through integrated transporting discharging U2 transfers to wherein one road AD port of single-chip microcomputer IC01 by resistance R 09, such as 30 pin, is that digital signal is for routine call calculating with analog signal conversion.
In like manner, at the phase current detecting unit that is used for acquisition testing V phase current, the in-phase input end of integrated transporting discharging U3 connects the source electrode NV of the following brachium pontis IGBT of V phase among the three-phase inverter IPM by current sampling resistor R17, and receive by resistance R 07, the dc offset voltage that the resistance pressure-dividing network that R08 and DC power supply AVDD are formed by connecting provides, its inverting input passes through by divider resistance R05, R06 is connected the output of integrated transporting discharging U3 with the feedback network that R16 is formed by connecting, and the output of the output by integrated transporting discharging U3 is used to reflect the voltage signal IV_AD of V phase current size, transfer to other one road AD port of single-chip microcomputer IC01, such as 29 pin, with analog signal conversion is digital signal, is used for the calculating of motor speed.
In addition, in order to reach the purpose of overcurrent protection, present embodiment also further is provided with a bus current detecting unit in current detection module, comprises the sample circuit, integrated transporting discharging U1A and the comparator U1 that are used to gather bus current, as shown in Figure 3.Wherein, four road current sampling resistor R13 can be set in the sample circuit, R14, R15, R40, three road R13 wherein, R14, R15 is connected among the three-phase inverter IPM source electrode NU of brachium pontis IGBT under three tunnel, NV, between the in-phase input end of NW and integrated transporting discharging U1A, other one road current sampling resistor R40 is connected between the in-phase input end and power supply ground of described integrated transporting discharging U1A, by to U, V, W three road current sampling datas superpose, and then can obtain the current value of current time dc bus, gather the pressure drop at current sampling resistor R40 two ends, can obtain to reflect the pairing sample voltage value of current bus current size.Described sample voltage value is exported to the in-phase input end of integrated transporting discharging U1A; the inverting input of integrated transporting discharging U1A connects its output by the feedback circuit of being made up of resistance R 39, R44; and then output is used to reflect the voltage signal of bus current size; export the inverting input of comparator U1 to by the low pass filter of forming by resistance R 42 and capacitor C 204; after the reference voltage that inserts by comparator U1 and its in-phase input end compares; and then output high level or low level overcurrent protection signal IPMERR, feed back to described single-chip microcomputer IC01.
In the present embodiment, described reference voltage can utilize divider resistance R45, R38 that the direct voltage AVDD dividing potential drop of power module output is obtained, as shown in Figure 3.By adjusting the resistance of divider resistance R45, R38, reference voltage is reached on the pairing amplitude of current protection threshold value.When the amplitude of voltage signal that is used to reflect the bus current size by integrated transporting discharging U1A output surpasses described reference voltage, by the effective overcurrent protection signal of comparator U1 output low level IPMERR.At this moment, each road IGBT ends among the single-chip microcomputer IC01 control three-phase inverter IPM, to stop the inversion output of three-phase alternating-current supply, the brush DC fan electromotor is shut down, and reaches the purpose of overcurrent protection.
The brush DC fan electromotor external drive that present embodiment proposed, technology is simple, and is with low cost, is adapted at applying in the electronic product that needs such as air conditioner adopt the brush DC fan electromotor.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. brush DC fan electromotor driver is characterized in that: comprise control module, three-phase inverter, current detection module and the power module of working power is provided for each module; Described three-phase inverter receives the DC bus-bar voltage of power module output, and under the control action of the switch controlling signal that control module is sent, DC bus-bar voltage is reverse into three-phase alternating voltage exports the brush DC fan electromotor to; The current delivery of the source electrode output by brachium pontis IGBT under the described three-phase inverter feeds back to described control module to described current detection module after current detection module is handled.
2. brush DC fan electromotor driver according to claim 1, it is characterized in that: in described current detection module, include two phase current detecting units, respectively in the inverter wherein under the two-way electric current of the source electrode of brachium pontis IGBT output carry out sample detecting; In each phase current detecting unit, all include one road integrated transporting discharging, its in-phase input end connects wherein the source electrode of brachium pontis IGBT under a tunnel by current sampling resistor, its inverting input connects power supply ground, the output that connects integrated transporting discharging simultaneously constitutes negative feedback network, the in-phase input end of integrated transporting discharging and inverting input are formed differential amplifier circuit jointly, by high speed integrated transporting discharging output be used to reflect that the voltage signal of sample rate current feeds back to described control module.
3. brush DC fan electromotor driver according to claim 2 is characterized in that: the in-phase input end at described integrated transporting discharging also is connected with resistance pressure-dividing network, applies a biasing voltage to the in-phase input end of described integrated transporting discharging.
4. brush DC fan electromotor driver according to claim 2, it is characterized in that: in described feedback network, include two divider resistances at least, the inverting input of described integrated transporting discharging connects the output of described integrated transporting discharging on the other hand on the one hand by one road divider resistance ground connection by other one road divider resistance.
5. according to each described brush DC fan electromotor driver in the claim 1 to 4; it is characterized in that: in described current detection module, be provided with a bus current detecting unit; comprise the sample circuit that is used to gather bus current; the bus current that collects is converted to the in-phase input end that sampled voltage exports one road integrated transporting discharging to; the inverting input of described integrated transporting discharging connects the output of integrated transporting discharging by feedback circuit; by the output of described integrated transporting discharging be used to reflect that the voltage signal of bus current size exports a comparator to; after reference voltage by comparator and setting compared, the output overcurrent guard signal fed back to described control module.
6. brush DC fan electromotor driver according to claim 5, it is characterized in that: in described sample circuit, comprise four road current sampling resistors, wherein three the tunnel be connected in the inverter between the in-phase input end of the source electrode of brachium pontis I GBT under three tunnel and described integrated transporting discharging, other one road current sampling resistor is connected between the in-phase input end and power supply ground of described integrated transporting discharging.
7. brush DC fan electromotor driver according to claim 5 is characterized in that: described control module connected storage.
8. brush DC fan electromotor driver according to claim 7, it is characterized in that: described memory is EEPROM, passes through I
2The C bus is connected communication with control module.
9. brush DC fan electromotor driver according to claim 7 is characterized in that: described control module is a single-chip microcomputer; Described inverter is Intelligent Power Module IPM.
10. an air conditioner comprises indoor set and off-premises station, is provided with the brush DC fan electromotor in described off-premises station; It is characterized in that: described brush DC fan electromotor is external as the described brush DC fan electromotor of each claim driver in the claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206991310U CN202014219U (en) | 2010-12-30 | 2010-12-30 | Direct-current brushless fan motor driver and air conditioner adopting driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206991310U CN202014219U (en) | 2010-12-30 | 2010-12-30 | Direct-current brushless fan motor driver and air conditioner adopting driver |
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| CN202014219U true CN202014219U (en) | 2011-10-19 |
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| CN2010206991310U Expired - Fee Related CN202014219U (en) | 2010-12-30 | 2010-12-30 | Direct-current brushless fan motor driver and air conditioner adopting driver |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014015678A1 (en) * | 2012-07-21 | 2014-01-30 | 中山大洋电机股份有限公司 | Hvac control system of household central air conditioner |
| CN106121898A (en) * | 2016-07-04 | 2016-11-16 | 上海理工大学 | Recirculated cooling water hydraulic recovery energy conserving system based on intelligent electric source control |
| CN106288159A (en) * | 2016-08-05 | 2017-01-04 | 广东美的暖通设备有限公司 | The control method of air-conditioner, control device and air-conditioner |
| CN107678334A (en) * | 2017-09-25 | 2018-02-09 | 四川长虹电器股份有限公司 | The MCU chip of built-in amplifier and its application on frequency conversion refrigerator |
| CN107947664A (en) * | 2017-12-13 | 2018-04-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Brushless direct current motor driver |
| CN108134551A (en) * | 2017-12-21 | 2018-06-08 | 青岛海信日立空调***有限公司 | A kind of fan drive circuit, air conditioner indoor unit and air-conditioning |
| US10234165B2 (en) | 2012-07-21 | 2019-03-19 | Zhongshan Broad-Ocean Motor Co., Ltd. | HVAC control system for household central air conditioning |
| CN109950877A (en) * | 2019-04-24 | 2019-06-28 | 苏州易德龙科技股份有限公司 | A kind of three-phase motor driver overcurrent protective device |
| CN111025038A (en) * | 2019-08-28 | 2020-04-17 | 湖南大学 | Prediction method and system for radiation electromagnetic interference of electric drive system |
| CN114061123A (en) * | 2020-08-03 | 2022-02-18 | 海信（山东）空调有限公司 | Fan motor driving device of indoor unit of air conditioner and air conditioner |
| CN114397470A (en) * | 2021-11-24 | 2022-04-26 | 浙江捷昌线性驱动科技股份有限公司 | Stroke control system based on motor current characteristics |
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2010
- 2010-12-30 CN CN2010206991310U patent/CN202014219U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10234165B2 (en) | 2012-07-21 | 2019-03-19 | Zhongshan Broad-Ocean Motor Co., Ltd. | HVAC control system for household central air conditioning |
| WO2014015678A1 (en) * | 2012-07-21 | 2014-01-30 | 中山大洋电机股份有限公司 | Hvac control system of household central air conditioner |
| CN106121898A (en) * | 2016-07-04 | 2016-11-16 | 上海理工大学 | Recirculated cooling water hydraulic recovery energy conserving system based on intelligent electric source control |
| CN106121898B (en) * | 2016-07-04 | 2019-10-29 | 上海理工大学 | Recirculated cooling water hydraulic recovery energy conserving system based on intelligent electric source control |
| CN106288159B (en) * | 2016-08-05 | 2019-11-15 | 广东美的暖通设备有限公司 | Control method, control device and the air conditioner of air conditioner |
| CN106288159A (en) * | 2016-08-05 | 2017-01-04 | 广东美的暖通设备有限公司 | The control method of air-conditioner, control device and air-conditioner |
| CN107678334A (en) * | 2017-09-25 | 2018-02-09 | 四川长虹电器股份有限公司 | The MCU chip of built-in amplifier and its application on frequency conversion refrigerator |
| CN107678334B (en) * | 2017-09-25 | 2020-04-28 | 四川长虹电器股份有限公司 | MCU chip with built-in operational amplifier and application thereof in variable frequency refrigerator |
| CN107947664A (en) * | 2017-12-13 | 2018-04-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Brushless direct current motor driver |
| CN108134551A (en) * | 2017-12-21 | 2018-06-08 | 青岛海信日立空调***有限公司 | A kind of fan drive circuit, air conditioner indoor unit and air-conditioning |
| CN109950877A (en) * | 2019-04-24 | 2019-06-28 | 苏州易德龙科技股份有限公司 | A kind of three-phase motor driver overcurrent protective device |
| CN111025038A (en) * | 2019-08-28 | 2020-04-17 | 湖南大学 | Prediction method and system for radiation electromagnetic interference of electric drive system |
| CN114061123A (en) * | 2020-08-03 | 2022-02-18 | 海信（山东）空调有限公司 | Fan motor driving device of indoor unit of air conditioner and air conditioner |
| CN114397470A (en) * | 2021-11-24 | 2022-04-26 | 浙江捷昌线性驱动科技股份有限公司 | Stroke control system based on motor current characteristics |
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